using DataConnection.REST.Configuration;
using DataConnection.REST.Interfaces;
using DataConnection.REST.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Json;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Threading;
using System.Threading.Tasks;

namespace DataConnection.REST.Implementations
{
    /// <summary>
    /// Client specific for Salesforce REST API.
    /// Handles OAuth2 authentication and metadata discovery.
    /// </summary>
    public class SalesforceServiceClient : BaseRestServiceClient, IRestMetadataDiscovery
    {
        private string? _accessToken;
        private string? _instanceUrl;
        private DateTime _tokenExpiry;

        /// <summary>
        /// Configurazione JSON per garantire la compatibilità con Salesforce API
        /// Utilizza sempre la cultura invariante per i numeri per evitare problemi con virgole/punti decimali
        /// </summary>
        private static readonly JsonSerializerOptions SalesforceJsonOptions = new JsonSerializerOptions
        {
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
            NumberHandling = JsonNumberHandling.WriteAsString | JsonNumberHandling.AllowReadingFromString,
            Encoder = System.Text.Encodings.Web.JavaScriptEncoder.UnsafeRelaxedJsonEscaping
        };

        public SalesforceServiceClient(HttpClient httpClient, RestServiceOptions options)
            : base(httpClient, options)
        {
        }

        /// <summary>
        /// Authenticates with Salesforce using Username/Password OAuth2 flow.
        /// </summary>
        /// <param name="clientId">Connected App Consumer Key</param>
        /// <param name="clientSecret">Connected App Consumer Secret</param>
        /// <param name="username">Salesforce username</param>
        /// <param name="password">Salesforce password + security token</param>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>True if authentication is successful</returns>
        public async Task<bool> AuthenticateAsync(string clientId, string clientSecret, string username, string password, CancellationToken cancellationToken = default)
        {
            try
            {
                var tokenEndpoint = "/services/oauth2/token";
                
                var tokenRequest = new List<KeyValuePair<string, string>>
                {
                    new("grant_type", "password"),
                    new("client_id", clientId),
                    new("client_secret", clientSecret),
                    new("username", username),
                    new("password", password)
                };

                var formContent = new FormUrlEncodedContent(tokenRequest);
                
                Console.WriteLine($"--- Salesforce Authentication Attempt ---");
                Console.WriteLine($"Target URL: {_httpClient.BaseAddress}{tokenEndpoint}");
                Console.WriteLine($"Username: {username}");
                Console.WriteLine($"--- End Salesforce Authentication Attempt ---");

                var response = await _httpClient.PostAsync(tokenEndpoint, formContent, cancellationToken);
                
                if (!response.IsSuccessStatusCode)
                {
                    var errorContent = await response.Content.ReadAsStringAsync(cancellationToken);
                    Console.WriteLine($"Salesforce Authentication failed: {response.StatusCode}");
                    Console.WriteLine($"Error details: {errorContent}");
                    return false;
                }

                var tokenResponse = await response.Content.ReadFromJsonAsync<SalesforceTokenResponse>(cancellationToken: cancellationToken);
                  if (tokenResponse != null && !string.IsNullOrEmpty(tokenResponse.AccessToken))
                {
                    _accessToken = tokenResponse.AccessToken;
                    _instanceUrl = tokenResponse.InstanceUrl;
                    _tokenExpiry = DateTime.UtcNow.AddSeconds(3600); // Default 1 hour, Salesforce doesn't always return expires_in
                    
                    // Don't change BaseAddress - we'll use absolute URLs for API calls
                    // Store the instance URL for building complete URLs later
                    
                    // Add Authorization header for future requests
                    _httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", _accessToken);
                    
                    Console.WriteLine($"Salesforce Authentication successful. Token expires around: {_tokenExpiry.ToLocalTime()}");
                    Console.WriteLine($"Instance URL: {_instanceUrl}");
                    return true;
                }

                Console.WriteLine("Salesforce Authentication response could not be parsed.");
                return false;
            }
            catch (HttpRequestException ex)
            {
                Console.WriteLine($"HTTP Request Error during Salesforce Authentication: {ex.Message}");
                if (ex.InnerException != null)
                {
                    Console.WriteLine($"Inner Exception: {ex.InnerException.Message}");
                }
                return false;
            }
            catch (JsonException ex)
            {
                Console.WriteLine($"JSON Parsing Error during Salesforce Authentication: {ex.Message}");
                return false;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce Authentication: {ex.Message}");
                return false;
            }
        }        /// <summary>
        /// Authenticates with Salesforce using the credentials from options.
        /// </summary>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>True if authentication is successful</returns>
        public override async Task<bool> AuthenticateAsync(CancellationToken cancellationToken = default)
        {
            // For Salesforce, we need ClientId, ClientSecret, Username, and Password
            // These should be provided in the options
            
            if (string.IsNullOrEmpty(_options.Username) || string.IsNullOrEmpty(_options.Password))
            {
                Console.WriteLine("Salesforce authentication requires username and password in options");
                return false;
            }

            if (string.IsNullOrEmpty(_options.ApiKey) || string.IsNullOrEmpty(_options.AuthToken))
            {
                Console.WriteLine("Salesforce authentication requires ApiKey (ClientId) and AuthToken (ClientSecret) in options");
                return false;
            }

            // Use the actual credentials from options
            var clientId = _options.ApiKey;        // ClientId should be in ApiKey field
            var clientSecret = _options.AuthToken; // ClientSecret should be in AuthToken field
            
            Console.WriteLine($"Using Salesforce credentials - ClientId: {clientId}, Username: {_options.Username}");
            
            return await AuthenticateAsync(clientId, clientSecret, _options.Username, _options.Password, cancellationToken);
        }

        /// <summary>
        /// Checks if the current access token is active.
        /// </summary>
        public bool IsAuthenticated()
        {
            return !string.IsNullOrEmpty(_accessToken) && DateTime.UtcNow < _tokenExpiry;
        }

        /// <summary>
        /// Discovers SObjects (entities) and their fields from Salesforce.
        /// </summary>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>A list of discovered entity information</returns>
        public async Task<List<RestEntityInfo>> DiscoverEntitiesAsync(CancellationToken cancellationToken = default)
        {
            if (!IsAuthenticated())
            {
                Console.WriteLine("Error: Not authenticated to Salesforce. Cannot discover metadata.");
                return new List<RestEntityInfo>();
            }

            var entities = new List<RestEntityInfo>();
            try
            {
                // First, get list of all SObjects
                var sobjectsEndpoint = $"{_instanceUrl}/services/data/v60.0/sobjects/";
                var response = await _httpClient.GetAsync(sobjectsEndpoint, cancellationToken);
                response.EnsureSuccessStatusCode();

                var sobjectsResponse = await response.Content.ReadFromJsonAsync<SalesforceSObjectsResponse>(cancellationToken: cancellationToken);                if (sobjectsResponse?.SObjects != null)
                {
                    // For demo purposes, limit to first 20 objects to avoid too many API calls
                    var limitedSObjects = sobjectsResponse.SObjects.ToList();

                    // Process SObjects in parallel for better performance
                    var semaphore = new SemaphoreSlim(20, 20); // Limit concurrent requests to 5
                    var tasks = limitedSObjects.Where(sobject => !string.IsNullOrEmpty(sobject.Name))
                        .Select(async sobject =>
                        {
                            await semaphore.WaitAsync(cancellationToken);
                            try
                            {
                                // Get detailed field information for each SObject
                                var describeEndpoint = $"{_instanceUrl}/services/data/v60.0/sobjects/{sobject.Name}/describe/";
                                var describeResponse = await _httpClient.GetAsync(describeEndpoint, cancellationToken);

                                if (describeResponse.IsSuccessStatusCode)
                                {
                                    var describeResult = await describeResponse.Content.ReadFromJsonAsync<SalesforceDescribeResponse>(cancellationToken: cancellationToken);

                                    if (describeResult?.Fields != null)
                                    {
                                        var entityInfo = new RestEntityInfo
                                        {
                                            Name = sobject.Name
                                        };

                                        foreach (var field in describeResult.Fields)
                                        {
                                            if (string.IsNullOrEmpty(field.Name)) continue;

                                            var propInfo = new RestPropertyInfo
                                            {
                                                Name = field.Name,
                                                Type = field.Type ?? "string",
                                                IsKey = field.Name.Equals("Id", StringComparison.OrdinalIgnoreCase)
                                            };
                                            entityInfo.Properties.Add(propInfo);
                                        }

                                        return entityInfo;
                                    }
                                }
                                return null;
                            }
                            catch (Exception ex)
                            {
                                Console.WriteLine($"Error describing SObject {sobject.Name}: {ex.Message}");
                                return null;
                            }
                            finally
                            {
                                semaphore.Release();
                            }
                        });

                    var results = await Task.WhenAll(tasks);
                    entities.AddRange(results.Where(result => result != null)!);
                }
            }
            catch (HttpRequestException ex)
            {
                Console.WriteLine($"HTTP Request Error during Salesforce metadata discovery: {ex.Message}");
            }
            catch (JsonException ex)
            {
                Console.WriteLine($"JSON Parsing Error during Salesforce metadata discovery: {ex.Message}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce metadata discovery: {ex.Message}");
            }

            return entities;
        }

        /// <summary>
        /// Discovers a list of available SObjects from Salesforce without detailed field information.
        /// </summary>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>A list of discovered SObject summaries</returns>
        public async Task<List<RestEntitySummary>> DiscoverEntitySummariesAsync(CancellationToken cancellationToken = default)
        {
            if (!IsAuthenticated())
            {
                Console.WriteLine("Error: Not authenticated to Salesforce. Cannot discover metadata.");
                return new List<RestEntitySummary>();
            }

            var entities = new List<RestEntitySummary>();
            try
            {
                // Get list of all SObjects
                var sobjectsEndpoint = $"{_instanceUrl}/services/data/v60.0/sobjects/";
                var response = await _httpClient.GetAsync(sobjectsEndpoint, cancellationToken);
                response.EnsureSuccessStatusCode();

                var sobjectsResponse = await response.Content.ReadFromJsonAsync<SalesforceSObjectsResponse>(cancellationToken: cancellationToken);
                
                if (sobjectsResponse?.SObjects != null)
                {
                    foreach (var sobject in sobjectsResponse.SObjects)
                    {
                        if (string.IsNullOrEmpty(sobject.Name)) continue;

                        var entitySummary = new RestEntitySummary
                        {
                            Name = sobject.Name,
                            Label = sobject.Label ?? sobject.Name,
                            IsCustom = sobject.Custom,
                            EntityType = "SObject"
                        };
                        entities.Add(entitySummary);
                    }
                }
            }
            catch (HttpRequestException ex)
            {
                Console.WriteLine($"HTTP Request Error during Salesforce metadata discovery: {ex.Message}");
            }
            catch (JsonException ex)
            {
                Console.WriteLine($"JSON Parsing Error during Salesforce metadata discovery: {ex.Message}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce metadata discovery: {ex.Message}");
            }

            return entities.OrderBy(e => e.Name).ToList();
        }

        /// <summary>
        /// Discovers detailed information for a specific SObject including all its fields.
        /// </summary>
        /// <param name="entityName">The name of the SObject to get details for</param>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>Detailed SObject information or null if not found</returns>
        public async Task<RestEntityInfo?> DiscoverEntityDetailsAsync(string entityName, CancellationToken cancellationToken = default)
        {
            if (!IsAuthenticated())
            {
                Console.WriteLine("Error: Not authenticated to Salesforce. Cannot discover entity details.");
                return null;
            }

            try
            {
                // Get detailed field information for the specific SObject
                var describeEndpoint = $"{_instanceUrl}/services/data/v60.0/sobjects/{entityName}/describe/";
                var describeResponse = await _httpClient.GetAsync(describeEndpoint, cancellationToken);

                if (!describeResponse.IsSuccessStatusCode)
                {
                    Console.WriteLine($"Failed to get details for SObject {entityName}: {describeResponse.StatusCode}");
                    return null;
                }

                var describeResult = await describeResponse.Content.ReadFromJsonAsync<SalesforceDescribeResponse>(cancellationToken: cancellationToken);

                if (describeResult?.Fields != null)
                {
                    var entityInfo = new RestEntityInfo
                    {
                        Name = entityName
                    };

                    foreach (var field in describeResult.Fields)
                    {
                        if (string.IsNullOrEmpty(field.Name)) continue;

                        var propInfo = new RestPropertyInfo
                        {
                            Name = field.Name,
                            Type = field.Type ?? "string",
                            IsKey = field.Name.Equals("Id", StringComparison.OrdinalIgnoreCase),
                            IsRequired = !field.Nillable,
                            MaxLength = field.Length > 0 ? field.Length : null
                        };
                        entityInfo.Properties.Add(propInfo);
                    }

                    return entityInfo;
                }
            }
            catch (HttpRequestException ex)
            {
                Console.WriteLine($"HTTP Request Error during Salesforce entity details discovery: {ex.Message}");
            }
            catch (JsonException ex)
            {
                Console.WriteLine($"JSON Parsing Error during Salesforce entity details discovery: {ex.Message}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce entity details discovery: {ex.Message}");
            }

            return null;
        }

        /// <summary>
        /// Creates a new SObject in Salesforce.
        /// </summary>
        /// <param name="entityName">The name of the SObject to create (e.g., "Account", "Contact").</param>
        /// <param name="entityData">The data for the new SObject as key-value pairs.</param>
        /// <param name="cancellationToken">Cancellation token.</param>
        /// <returns>The created entity data or null if creation failed.</returns>
        public override async Task<Dictionary<string, object>?> CreateEntityAsync(string entityName, Dictionary<string, object> entityData, CancellationToken cancellationToken = default)
        {
            if (!IsAuthenticated())
            {
                Console.WriteLine("Error: Not authenticated to Salesforce. Cannot create entity.");
                return null;
            }            // Salesforce REST API endpoint for creating SObjects
            var createUri = $"{_instanceUrl}/services/data/v60.0/sobjects/{entityName}/";

            try
            {
                Console.WriteLine($"--- Salesforce Entity Creation Attempt ---");
                Console.WriteLine($"SObject: {entityName}");
                Console.WriteLine($"Target URL: {createUri}");
                Console.WriteLine($"Data: {JsonSerializer.Serialize(entityData, SalesforceJsonOptions)}");

                // Normalizza i valori numerici per evitare problemi con virgole decimali
                var normalizedData = NormalizeNumericValues(entityData);

                // Usa StringContent con configurazione JSON specifica per Salesforce
                var jsonContent = new StringContent(
                    JsonSerializer.Serialize(normalizedData, SalesforceJsonOptions),
                    System.Text.Encoding.UTF8,
                    "application/json"
                );

                var response = await _httpClient.PostAsync(createUri, jsonContent, cancellationToken);

                if (!response.IsSuccessStatusCode)
                {
                    var errorContent = await response.Content.ReadAsStringAsync(cancellationToken);
                    Console.WriteLine($"Salesforce Entity Creation failed: {response.StatusCode}");
                    Console.WriteLine($"Error details: {errorContent}");
                    Console.WriteLine($"--- End Salesforce Entity Creation Attempt (Failed) ---");
                    return null;
                }

                var responseContent = await response.Content.ReadAsStringAsync(cancellationToken);
                Console.WriteLine($"Salesforce Entity Creation successful");
                Console.WriteLine($"Response: {responseContent}");
                Console.WriteLine($"--- End Salesforce Entity Creation Attempt (Success) ---");

                if (string.IsNullOrEmpty(responseContent))
                    return entityData; // Return original data if no response content

                // Salesforce returns creation result with Id and success status
                var creationResult = JsonSerializer.Deserialize<Dictionary<string, object>>(responseContent, SalesforceJsonOptions);
                
                // Merge the original data with the creation result (which includes the new Id)
                if (creationResult != null)
                {
                    var result = new Dictionary<string, object>(entityData);
                    foreach (var kvp in creationResult)
                    {
                        result[kvp.Key] = kvp.Value;
                    }
                    return result;
                }

                return creationResult;
            }
            catch (HttpRequestException ex)
            {
                Console.WriteLine($"HTTP Request Error during Salesforce entity creation: {ex.Message}");
                if (ex.InnerException != null)
                {
                    Console.WriteLine($"Inner Exception: {ex.InnerException.Message}");
                }
                Console.WriteLine($"--- End Salesforce Entity Creation Attempt (Exception) ---");
                return null;
            }
            catch (JsonException ex)
            {
                Console.WriteLine($"JSON Parsing Error during Salesforce entity creation: {ex.Message}");
                Console.WriteLine($"--- End Salesforce Entity Creation Attempt (JsonException) ---");
                return null;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce entity creation: {ex.Message}");
                Console.WriteLine($"--- End Salesforce Entity Creation Attempt (Exception) ---");
                return null;
            }        }

        public override async Task<Dictionary<string, object>?> UpsertEntityAsync(string entityName, Dictionary<string, object> entityData, CancellationToken cancellationToken = default)
        {
            // Per Salesforce, implementiamo upsert provando prima la creazione
            // Se fallisce con un errore di duplicato, potremmo implementare logic di aggiornamento
            // Per ora, semplicemente tentiamo la creazione
            try
            {
                Console.WriteLine($"--- Starting Salesforce Entity Upsert: {entityName} ---");
                Console.WriteLine($"Entity Data: {string.Join(", ", entityData.Select(kvp => $"{kvp.Key}={kvp.Value}"))}");

                // Prima tenta la creazione
                var result = await CreateEntityAsync(entityName, entityData, cancellationToken);
                
                if (result != null)
                {
                    Console.WriteLine($"Upsert completed successfully via CREATE for {entityName}");
                    return result;
                }

                // Se la creazione fallisce, potresti implementare qui la logica di aggiornamento
                // Per ora, restituiamo null
                Console.WriteLine($"Upsert failed for {entityName}");
                return null;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce entity upsert: {ex.Message}");
                return null;
            }
        }        /// <summary>
        /// Finds entities by their key fields in Salesforce.
        /// </summary>
        /// <param name="entityName">The name of the SObject to search (e.g., "Account", "Contact").</param>
        /// <param name="keyFields">The key fields and their values to match.</param>
        /// <param name="cancellationToken">Cancellation token.</param>
        /// <returns>A list of matching entities or an empty list if none found.</returns>
        public override async Task<List<Dictionary<string, object>>> FindEntitiesByKeysAsync(string entityName, Dictionary<string, object> keyFields, CancellationToken cancellationToken = default)
        {
            try
            {
                Console.WriteLine($"--- Starting Salesforce Entity Search: {entityName} ---");
                Console.WriteLine($"Key Fields: {string.Join(", ", keyFields.Select(kvp => $"{kvp.Key}={kvp.Value}"))}");

                if (!await EnsureAuthenticatedAsync(cancellationToken))
                {
                    Console.WriteLine("Authentication failed for entity search");
                    return new List<Dictionary<string, object>>();
                }

                // Costruisci la query SOQL
                var whereConditions = keyFields.Select(kvp => 
                {
                    var value = kvp.Value?.ToString() ?? "";
                    // Se il valore è una stringa, aggiungi le virgolette
                    if (kvp.Value is string)
                    {
                        value = $"'{value.Replace("'", "\\'")}'"; // Escape delle virgolette
                    }
                    return $"{kvp.Key} = {value}";
                });

                var query = $"SELECT Id FROM {entityName} WHERE {string.Join(" AND ", whereConditions)}";
                Console.WriteLine($"SOQL Query: {query}");

                var encodedQuery = Uri.EscapeDataString(query);
                var queryEndpoint = $"/services/data/v59.0/query/?q={encodedQuery}";                var response = await GetAsync<SalesforceQueryResponse>(queryEndpoint, cancellationToken);
                
                if (response?.Records != null)
                {
                    var results = response.Records.Select(record => 
                        record as Dictionary<string, object> ?? new Dictionary<string, object>()
                    ).ToList();
                    
                    Console.WriteLine($"Found {results.Count} entities matching the key fields");
                    return results;
                }

                Console.WriteLine("No entities found matching the key fields");
                return new List<Dictionary<string, object>>();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce entity search: {ex.Message}");
                return new List<Dictionary<string, object>>();
            }
        }        /// <summary>
        /// Deletes an entity in Salesforce by its ID.
        /// </summary>
        /// <param name="entityName">The name of the SObject (e.g., "Account", "Contact").</param>
        /// <param name="entityId">The ID of the entity to delete.</param>
        /// <param name="cancellationToken">Cancellation token.</param>
        /// <returns>True if deletion was successful, false otherwise.</returns>
        public override async Task<bool> DeleteEntityAsync(string entityName, string entityId, CancellationToken cancellationToken = default)
        {
            try
            {
                Console.WriteLine($"--- Starting Salesforce Entity Delete: {entityName}/{entityId} ---");

                if (!await EnsureAuthenticatedAsync(cancellationToken))
                {
                    Console.WriteLine("Authentication failed for entity deletion");
                    return false;
                }

                var deleteEndpoint = $"/services/data/v59.0/sobjects/{entityName}/{entityId}";
                
                // Salesforce usa DELETE HTTP method per eliminare record
                var request = new HttpRequestMessage(HttpMethod.Delete, $"{_instanceUrl}{deleteEndpoint}");
                request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", _accessToken);

                var response = await _httpClient.SendAsync(request, cancellationToken);

                if (response.IsSuccessStatusCode)
                {
                    Console.WriteLine($"Entity {entityName}/{entityId} deleted successfully");
                    return true;
                }
                else
                {
                    var errorContent = await response.Content.ReadAsStringAsync(cancellationToken);
                    Console.WriteLine($"Failed to delete entity {entityName}/{entityId}. Status: {response.StatusCode}, Error: {errorContent}");
                    return false;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce entity deletion: {ex.Message}");
                return false;
            }
        }

        /// <summary>
        /// Updates an existing entity in Salesforce by its ID.
        /// </summary>
        /// <param name="entityName">The name of the SObject (e.g., "Account", "Contact").</param>
        /// <param name="entityId">The ID of the entity to update.</param>
        /// <param name="entityData">The data to update as key-value pairs.</param>
        /// <param name="cancellationToken">Cancellation token.</param>
        /// <returns>The updated entity data or null if update failed.</returns>
        public override async Task<Dictionary<string, object>?> UpdateEntityAsync(string entityName, string entityId, Dictionary<string, object> entityData, CancellationToken cancellationToken = default)
        {
            try
            {
                Console.WriteLine($"--- Starting Salesforce Entity Update: {entityName}/{entityId} ---");

                if (!await EnsureAuthenticatedAsync(cancellationToken))
                {
                    Console.WriteLine("Authentication failed for entity update");
                    return null;
                }

                var updateEndpoint = $"/services/data/v59.0/sobjects/{entityName}/{entityId}";
                
                // Salesforce usa PATCH HTTP method per aggiornare record
                var request = new HttpRequestMessage(HttpMethod.Patch, $"{_instanceUrl}{updateEndpoint}");
                request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", _accessToken);
                request.Content = JsonContent.Create(entityData);

                var response = await _httpClient.SendAsync(request, cancellationToken);

                if (response.IsSuccessStatusCode)
                {
                    Console.WriteLine($"Entity {entityName}/{entityId} updated successfully");
                    
                    // Ritorna i dati aggiornati includendo l'ID
                    var updatedData = new Dictionary<string, object>(entityData)
                    {
                        ["Id"] = entityId
                    };
                    return updatedData;
                }
                else
                {
                    var errorContent = await response.Content.ReadAsStringAsync(cancellationToken);
                    Console.WriteLine($"Failed to update entity {entityName}/{entityId}. Status: {response.StatusCode}, Error: {errorContent}");
                    return null;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce entity update: {ex.Message}");
                return null;
            }
        }

        /// <summary>
        /// Ensures the client is authenticated, attempting to authenticate if not already authenticated.
        /// </summary>
        /// <param name="cancellationToken">Cancellation token.</param>
        /// <returns>True if authentication is successful, false otherwise.</returns>
        private async Task<bool> EnsureAuthenticatedAsync(CancellationToken cancellationToken = default)
        {
            if (IsAuthenticated())
            {
                return true;
            }

            Console.WriteLine("Client not authenticated, attempting to authenticate...");
            return await AuthenticateAsync(cancellationToken);
        }

        /// <summary>
        /// Normalizza i valori numerici in un dictionary per garantire compatibilità con Salesforce API
        /// Converte valori decimali con virgola in formato con punto decimale
        /// </summary>
        private static Dictionary<string, object> NormalizeNumericValues(Dictionary<string, object> data)
        {
            var normalizedData = new Dictionary<string, object>();
            bool hasNormalized = false;
            
            foreach (var kvp in data)
            {
                var value = kvp.Value;
                
                if (value != null)
                {
                    // Se è una stringa che rappresenta un numero decimale con virgola, convertila
                    if (value is string stringValue && IsNumericWithComma(stringValue))
                    {
                        if (decimal.TryParse(stringValue, System.Globalization.NumberStyles.Number, 
                            System.Globalization.CultureInfo.CurrentCulture, out decimal decimalValue))
                        {
                            // Converte in double usando cultura invariante per garantire punto decimale
                            var normalizedValue = double.Parse(decimalValue.ToString(System.Globalization.CultureInfo.InvariantCulture));
                            normalizedData[kvp.Key] = normalizedValue;
                            Console.WriteLine($"NUMERIC NORMALIZATION: {kvp.Key}: '{stringValue}' → {normalizedValue}");
                            hasNormalized = true;
                        }
                        else
                        {
                            normalizedData[kvp.Key] = value;
                        }
                    }
                    // Se è già un decimal, convertilo in double con cultura invariante
                    else if (value is decimal dec)
                    {
                        var normalizedValue = double.Parse(dec.ToString(System.Globalization.CultureInfo.InvariantCulture));
                        normalizedData[kvp.Key] = normalizedValue;
                        Console.WriteLine($"DECIMAL NORMALIZATION: {kvp.Key}: {dec} → {normalizedValue}");
                        hasNormalized = true;
                    }
                    else
                    {
                        normalizedData[kvp.Key] = value;
                    }
                }
                else
                {
                    normalizedData[kvp.Key] = value!;
                }
            }
            
            if (hasNormalized)
            {
                Console.WriteLine($"NORMALIZATION SUMMARY: Processed {data.Count} fields, normalized {normalizedData.Count(kvp => kvp.Value is double)} numeric values");
            }
            
            return normalizedData;
        }

        /// <summary>
        /// Verifica se una stringa rappresenta un numero con virgola decimale
        /// </summary>
        private static bool IsNumericWithComma(string value)
        {
            if (string.IsNullOrEmpty(value)) return false;
            
            // Pattern per numeri con virgola: opzionale segno, cifre, virgola, cifre
            return System.Text.RegularExpressions.Regex.IsMatch(value.Trim(), @"^[+-]?\d+,\d+$");
        }

        // --- Nested classes for deserializing Salesforce responses ---
        private class SalesforceTokenResponse
        {
            [JsonPropertyName("access_token")]
            public string AccessToken { get; set; } = string.Empty;

            [JsonPropertyName("instance_url")]
            public string InstanceUrl { get; set; } = string.Empty;

            [JsonPropertyName("id")]
            public string Id { get; set; } = string.Empty;

            [JsonPropertyName("token_type")]
            public string TokenType { get; set; } = string.Empty;

            [JsonPropertyName("issued_at")]
            public string IssuedAt { get; set; } = string.Empty;

            [JsonPropertyName("signature")]
            public string Signature { get; set; } = string.Empty;
        }

        private class SalesforceSObjectsResponse
        {
            [JsonPropertyName("encoding")]
            public string Encoding { get; set; } = string.Empty;

            [JsonPropertyName("maxBatchSize")]
            public int MaxBatchSize { get; set; }

            [JsonPropertyName("sobjects")]
            public List<SalesforceSObject> SObjects { get; set; } = new List<SalesforceSObject>();
        }

        private class SalesforceSObject
        {
            [JsonPropertyName("name")]
            public string Name { get; set; } = string.Empty;

            [JsonPropertyName("label")]
            public string Label { get; set; } = string.Empty;

            [JsonPropertyName("custom")]
            public bool Custom { get; set; }

            [JsonPropertyName("keyPrefix")]
            public string KeyPrefix { get; set; } = string.Empty;
        }

        private class SalesforceDescribeResponse
        {
            [JsonPropertyName("name")]
            public string Name { get; set; } = string.Empty;

            [JsonPropertyName("label")]
            public string Label { get; set; } = string.Empty;

            [JsonPropertyName("fields")]
            public List<SalesforceField> Fields { get; set; } = new List<SalesforceField>();        }        /// <summary>
        /// Finds entities by required fields to detect duplicates.
        /// </summary>
        /// <param name="entityName">The name of the entity to search.</param>
        /// <param name="requiredFields">The required fields and their values to search for.</param>
        /// <param name="cancellationToken">Cancellation token.</param>
        /// <returns>A list of matching entities.</returns>
        public override async Task<List<Dictionary<string, object>>> FindEntitiesByRequiredFieldsAsync(string entityName, Dictionary<string, object> requiredFields, CancellationToken cancellationToken = default)
        {
            try
            {
                Console.WriteLine($"--- Searching for duplicates in {entityName} by required fields ---");

                if (!await EnsureAuthenticatedAsync(cancellationToken))
                {
                    Console.WriteLine("Authentication failed for required fields search");
                    return new List<Dictionary<string, object>>();
                }

                if (!requiredFields.Any())
                {
                    Console.WriteLine("No required fields provided for duplicate search");
                    return new List<Dictionary<string, object>>();
                }                // Build WHERE clause with required fields
                var whereConditions = new List<string>();
                foreach (var field in requiredFields)
                {
                    if (field.Value != null)
                    {
                        var value = field.Value.ToString();
                        // Escape single quotes in string values
                        if (field.Value is string stringValue)
                        {
                            value = stringValue.Replace("'", "\\'");
                            whereConditions.Add($"{field.Key} = '{value}'");
                        }
                        else
                        {
                            whereConditions.Add($"{field.Key} = {value}");
                        }
                    }
                }

                if (!whereConditions.Any())
                {
                    Console.WriteLine("No valid field values provided for duplicate search");
                    return new List<Dictionary<string, object>>();
                }

                var whereClause = string.Join(" AND ", whereConditions);
                var query = $"SELECT Id, {string.Join(", ", requiredFields.Keys)} FROM {entityName} WHERE {whereClause}";
                
                Console.WriteLine($"Executing duplicate search query: {query}");

                var queryEndpoint = $"/services/data/v59.0/query?q={Uri.EscapeDataString(query)}";
                var response = await GetAsync<SalesforceQueryResponse>($"{_instanceUrl}{queryEndpoint}", cancellationToken);

                if (response?.Records != null)
                {
                    Console.WriteLine($"Found {response.Records.Count} potential duplicates for required fields: {string.Join(", ", requiredFields.Select(kv => $"{kv.Key}={kv.Value}"))}");
                    return response.Records;
                }

                Console.WriteLine("No duplicates found");
                return new List<Dictionary<string, object>>();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during required fields search: {ex.Message}");
                return new List<Dictionary<string, object>>();
            }
        }

        private class SalesforceField
        {
            [JsonPropertyName("name")]
            public string Name { get; set; } = string.Empty;

            [JsonPropertyName("type")]
            public string Type { get; set; } = string.Empty;

            [JsonPropertyName("label")]
            public string Label { get; set; } = string.Empty;

            [JsonPropertyName("length")]
            public int Length { get; set; }

            [JsonPropertyName("nillable")]
            public bool Nillable { get; set; }

            [JsonPropertyName("unique")]
            public bool Unique { get; set; }
        }

        private class SalesforceQueryResponse
        {
            [JsonPropertyName("records")]
            public List<Dictionary<string, object>> Records { get; set; } = new List<Dictionary<string, object>>();
        }

        private class SalesforceCompositeRequest
        {
            [JsonPropertyName("compositeRequest")]
            public List<SalesforceCompositeSubRequest> CompositeRequest { get; set; } = new List<SalesforceCompositeSubRequest>();
        }

        private class SalesforceCompositeSubRequest
        {
            [JsonPropertyName("method")]
            public string Method { get; set; } = string.Empty;

            [JsonPropertyName("url")]
            public string Url { get; set; } = string.Empty;

            [JsonPropertyName("referenceId")]
            public string ReferenceId { get; set; } = string.Empty;

            [JsonPropertyName("body")]
            public object Body { get; set; } = new object();
        }

        private class SalesforceCompositeResponse
        {
            [JsonPropertyName("compositeResponse")]
            public List<SalesforceCompositeSubResponse> CompositeResponse { get; set; } = new List<SalesforceCompositeSubResponse>();
        }

        private class SalesforceCompositeSubResponse
        {
            [JsonPropertyName("referenceId")]
            public string ReferenceId { get; set; } = string.Empty;

            [JsonPropertyName("httpStatusCode")]
            public int HttpStatusCode { get; set; }

            [JsonPropertyName("body")]
            public object Body { get; set; } = new object();
        }

        public class CompositeOperationResult
        {
            public string ReferenceId { get; set; } = string.Empty;
            public string? EntityId { get; set; }
            public int HttpStatusCode { get; set; }
            public bool Success { get; set; }
            public string ErrorMessage { get; set; } = string.Empty;
            public Dictionary<string, object>? CreatedData { get; set; }
            public Dictionary<string, object>? UpdatedData { get; set; }
        }

        /// <summary>
        /// Executes multiple create operations using Salesforce Composite API with automatic batching
        /// </summary>
        /// <param name="entityName">The name of the SObject to create</param>
        /// <param name="entityDataList">List of entity data to create</param>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>List of results for each create operation</returns>
        public async Task<List<CompositeOperationResult>> BatchCreateEntitiesAsync(string entityName, List<Dictionary<string, object>> entityDataList, CancellationToken cancellationToken = default)
        {
            if (!IsAuthenticated())
            {
                Console.WriteLine("Error: Not authenticated to Salesforce. Cannot perform batch create.");
                return new List<CompositeOperationResult>();
            }

            if (!entityDataList.Any())
            {
                return new List<CompositeOperationResult>();
            }

            // Salesforce limit: max 25 operations per composite request
            const int maxBatchSize = 25;

            // Split into batches of 25
            var batches = new List<(List<Dictionary<string, object>> batch, int startIndex, int batchNumber)>();
            for (int i = 0; i < entityDataList.Count; i += maxBatchSize)
            {
                var batch = entityDataList.Skip(i).Take(maxBatchSize).ToList();
                var batchNumber = (i / maxBatchSize) + 1;
                batches.Add((batch, i, batchNumber));
            }

            var totalBatches = batches.Count;
            Console.WriteLine($"--- Starting parallel processing of {totalBatches} batch(es) with {entityDataList.Count} total records ---");

            // Execute all batches in parallel
            var batchTasks = batches.Select(async b =>
            {
                Console.WriteLine($"--- Processing Batch {b.batchNumber}/{totalBatches}: {b.batch.Count} records (parallel) ---");
                return await ExecuteCreateBatchAsync(entityName, b.batch, b.startIndex, cancellationToken);
            });

            var batchResults = await Task.WhenAll(batchTasks);

            // Aggregate all results
            var allResults = new List<CompositeOperationResult>();
            foreach (var result in batchResults)
            {
                allResults.AddRange(result);
            }

            Console.WriteLine($"All batches completed: {allResults.Count(r => r.Success)} success, {allResults.Count(r => !r.Success)} failed");
            return allResults;
        }

        private async Task<List<CompositeOperationResult>> ExecuteCreateBatchAsync(string entityName, List<Dictionary<string, object>> batch, int startIndex, CancellationToken cancellationToken)
        {
            try
            {
                // Salesforce Composite API endpoint
                var compositeUri = $"{_instanceUrl}/services/data/v60.0/composite/";

                // Build composite request
                var compositeRequest = new SalesforceCompositeRequest();
                
                for (int i = 0; i < batch.Count; i++)
                {
                    // Normalizza i valori numerici per evitare problemi con virgole decimali
                    var normalizedData = NormalizeNumericValues(batch[i]);
                    
                    var subrequest = new SalesforceCompositeSubRequest
                    {
                        Method = "POST",
                        Url = $"/services/data/v60.0/sobjects/{entityName}/",
                        ReferenceId = $"create_{startIndex + i}",
                        Body = normalizedData
                    };
                    compositeRequest.CompositeRequest.Add(subrequest);
                }

                // Usa StringContent con configurazione JSON specifica per Salesforce
                var jsonContent = new StringContent(
                    JsonSerializer.Serialize(compositeRequest, SalesforceJsonOptions),
                    System.Text.Encoding.UTF8,
                    "application/json"
                );

                var response = await _httpClient.PostAsync(compositeUri, jsonContent, cancellationToken);
                
                if (!response.IsSuccessStatusCode)
                {
                    var errorContent = await response.Content.ReadAsStringAsync(cancellationToken);
                    Console.WriteLine($"Salesforce Batch Create failed: {response.StatusCode}");
                    Console.WriteLine($"Error details: {errorContent}");
                    
                    // Return error results for all operations in this batch
                    return batch.Select((_, index) => new CompositeOperationResult
                    {
                        ReferenceId = $"create_{startIndex + index}",
                        Success = false,
                        ErrorMessage = $"Batch operation failed: {response.StatusCode} - {errorContent}"
                    }).ToList();
                }

                var responseContent = await response.Content.ReadAsStringAsync(cancellationToken);
                var compositeResponse = JsonSerializer.Deserialize<SalesforceCompositeResponse>(responseContent, SalesforceJsonOptions);

                var results = new List<CompositeOperationResult>();
                
                if (compositeResponse?.CompositeResponse != null)
                {
                    foreach (var subResponse in compositeResponse.CompositeResponse)
                    {
                        var result = new CompositeOperationResult
                        {
                            ReferenceId = subResponse.ReferenceId,
                            HttpStatusCode = subResponse.HttpStatusCode,
                            Success = subResponse.HttpStatusCode >= 200 && subResponse.HttpStatusCode < 300
                        };

                        if (result.Success && subResponse.Body != null)
                        {
                            if (subResponse.Body is JsonElement bodyElement)
                            {
                                var bodyDict = JsonSerializer.Deserialize<Dictionary<string, object>>(bodyElement.GetRawText(), SalesforceJsonOptions);
                                result.CreatedData = bodyDict;
                                
                                // Extract the created ID
                                if (bodyDict?.ContainsKey("id") == true)
                                {
                                    result.EntityId = bodyDict["id"]?.ToString();
                                }
                            }
                        }
                        else
                        {
                            result.ErrorMessage = subResponse.Body?.ToString() ?? "Unknown error";
                        }

                        results.Add(result);
                    }
                }

                return results;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce batch create: {ex.Message}");
                
                // Return error results for all operations in this batch
                return batch.Select((_, index) => new CompositeOperationResult
                {
                    ReferenceId = $"create_{startIndex + index}",
                    Success = false,
                    ErrorMessage = ex.Message
                }).ToList();
            }
        }

        /// <summary>
        /// Executes multiple update operations using Salesforce Composite API with automatic batching
        /// </summary>
        /// <param name="entityName">The name of the SObject to update</param>
        /// <param name="updateData">Dictionary where key is entityId and value is the data to update</param>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>List of results for each update operation</returns>
        public async Task<List<CompositeOperationResult>> BatchUpdateEntitiesAsync(string entityName, Dictionary<string, Dictionary<string, object>> updateData, CancellationToken cancellationToken = default)
        {
            if (!IsAuthenticated())
            {
                Console.WriteLine("Error: Not authenticated to Salesforce. Cannot perform batch update.");
                return new List<CompositeOperationResult>();
            }

            if (!updateData.Any())
            {
                return new List<CompositeOperationResult>();
            }

            // Salesforce limit: max 25 operations per composite request
            const int maxBatchSize = 25;
            var updateList = updateData.ToList();

            // Split into batches of 25
            var batches = new List<(Dictionary<string, Dictionary<string, object>> batch, int startIndex, int batchNumber)>();
            for (int i = 0; i < updateList.Count; i += maxBatchSize)
            {
                var batch = updateList.Skip(i).Take(maxBatchSize).ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
                var batchNumber = (i / maxBatchSize) + 1;
                batches.Add((batch, i, batchNumber));
            }

            var totalBatches = batches.Count;
            Console.WriteLine($"--- Starting parallel processing of {totalBatches} update batch(es) with {updateList.Count} total records ---");

            // Execute all batches in parallel
            var batchTasks = batches.Select(async b =>
            {
                Console.WriteLine($"--- Processing Update Batch {b.batchNumber}/{totalBatches}: {b.batch.Count} records (parallel) ---");
                return await ExecuteUpdateBatchAsync(entityName, b.batch, b.startIndex, cancellationToken);
            });

            var batchResults = await Task.WhenAll(batchTasks);

            // Aggregate all results
            var allResults = new List<CompositeOperationResult>();
            foreach (var result in batchResults)
            {
                allResults.AddRange(result);
            }

            Console.WriteLine($"All update batches completed: {allResults.Count(r => r.Success)} success, {allResults.Count(r => !r.Success)} failed");
            return allResults;
        }

        private async Task<List<CompositeOperationResult>> ExecuteUpdateBatchAsync(string entityName, Dictionary<string, Dictionary<string, object>> batch, int startIndex, CancellationToken cancellationToken)
        {
            try
            {
                // Salesforce Composite API endpoint
                var compositeUri = $"{_instanceUrl}/services/data/v60.0/composite/";

                // Build composite request
                var compositeRequest = new SalesforceCompositeRequest();
                
                int index = 0;
                foreach (var kvp in batch)
                {
                    var entityId = kvp.Key;
                    var entityData = kvp.Value;
                    
                    // Normalizza i valori numerici per evitare problemi con virgole decimali
                    var normalizedData = NormalizeNumericValues(entityData);
                    
                    var subrequest = new SalesforceCompositeSubRequest
                    {
                        Method = "PATCH",
                        Url = $"/services/data/v60.0/sobjects/{entityName}/{entityId}",
                        ReferenceId = $"update_{startIndex + index}",
                        Body = normalizedData
                    };
                    compositeRequest.CompositeRequest.Add(subrequest);
                    index++;
                }

                // Usa StringContent con configurazione JSON specifica per Salesforce
                var jsonContent = new StringContent(
                    JsonSerializer.Serialize(compositeRequest, SalesforceJsonOptions),
                    System.Text.Encoding.UTF8,
                    "application/json"
                );

                var response = await _httpClient.PostAsync(compositeUri, jsonContent, cancellationToken);
                
                if (!response.IsSuccessStatusCode)
                {
                    var errorContent = await response.Content.ReadAsStringAsync(cancellationToken);
                    Console.WriteLine($"Salesforce Batch Update failed: {response.StatusCode}");
                    Console.WriteLine($"Error details: {errorContent}");
                    
                    // Return error results for all operations in this batch
                    return batch.Select((kvp, idx) => new CompositeOperationResult
                    {
                        ReferenceId = $"update_{startIndex + idx}",
                        EntityId = kvp.Key,
                        Success = false,
                        ErrorMessage = $"Batch operation failed: {response.StatusCode} - {errorContent}"
                    }).ToList();
                }

                var responseContent = await response.Content.ReadAsStringAsync(cancellationToken);
                var compositeResponse = JsonSerializer.Deserialize<SalesforceCompositeResponse>(responseContent, SalesforceJsonOptions);

                var results = new List<CompositeOperationResult>();
                
                if (compositeResponse?.CompositeResponse != null)
                {
                    int resultIndex = 0;
                    foreach (var subResponse in compositeResponse.CompositeResponse)
                    {
                        var originalEntityId = batch.ElementAt(resultIndex).Key;
                        
                        var result = new CompositeOperationResult
                        {
                            ReferenceId = subResponse.ReferenceId,
                            EntityId = originalEntityId,
                            HttpStatusCode = subResponse.HttpStatusCode,
                            Success = subResponse.HttpStatusCode >= 200 && subResponse.HttpStatusCode < 300
                        };

                        if (result.Success)
                        {
                            // For successful updates, create updated data with the ID
                            var originalData = batch.ElementAt(resultIndex).Value;
                            result.UpdatedData = new Dictionary<string, object>(originalData)
                            {
                                ["Id"] = originalEntityId
                            };
                        }
                        else
                        {
                            result.ErrorMessage = subResponse.Body?.ToString() ?? "Unknown error";
                        }

                        results.Add(result);
                        resultIndex++;
                    }
                }

                return results;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error during Salesforce batch update: {ex.Message}");
                
                // Return error results for all operations in this batch
                return batch.Select((kvp, idx) => new CompositeOperationResult
                {
                    ReferenceId = $"update_{startIndex + idx}",
                    EntityId = kvp.Key,
                    Success = false,
                    ErrorMessage = ex.Message
                }).ToList();
            }
        }
    }
}