using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;
using DataConnection.Interfaces;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Metadata;

namespace DataConnection.EF;

/// <summary>
/// Implementazione di IExistingDatabaseManager basata su Entity Framework Core
/// </summary>
public class EFCoreDatabaseManager : IDatabaseManager
{
    private readonly DbManagerOptions _options;
    private ExistingDatabaseContext _context;
    
    public EFCoreDatabaseManager(DbManagerOptions options)
    {
        _options = options ?? throw new ArgumentNullException(nameof(options));
        InitializeContext();
    }
    
    private void InitializeContext()
    {
        var optionsBuilder = new DbContextOptionsBuilder<ExistingDatabaseContext>();
        _options.DbContextConfigurator(optionsBuilder);
        
        _context = new ExistingDatabaseContext(
            optionsBuilder.Options,
            _options.ModelConfigurator,
            _options.EnableAutoDiscovery,
            _options.EntityAssembly,
            _options.EntityNamespace,
            _options.NamingStrategy);
    }
    
    public async Task<bool> TestConnectionAsync()
    {
        try
        {
            return await _context.Database.CanConnectAsync();
        }
        catch
        {
            return false;
        }
    }
    
    public async Task<IEnumerable<T>> GetAsync<T>(
        Expression<Func<T, bool>> filter = null,
        Func<IQueryable<T>, IOrderedQueryable<T>> orderBy = null,
        string includeProperties = "",
        int? skip = null,
        int? take = null) where T : class
    {
        IQueryable<T> query = _context.Set<T>();
        
        if (filter != null)
        {
            query = query.Where(filter);
        }
        
        foreach (var includeProperty in includeProperties.Split
            (new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
        {
            query = query.Include(includeProperty);
        }
        
        if (orderBy != null)
        {
            query = orderBy(query);
        }
        
        if (skip.HasValue)
        {
            query = query.Skip(skip.Value);
        }
        
        if (take.HasValue)
        {
            query = query.Take(take.Value);
        }
        
        return await query.ToListAsync();
    }
    
    public async Task<T> GetByIdAsync<T>(object id) where T : class
    {
        return await _context.Set<T>().FindAsync(id);
    }
    
    public async Task<IEnumerable<T>> ExecuteQueryAsync<T>(string sql, params object[] parameters) where T : class
    {
        return await _context.Set<T>().FromSqlRaw(sql, parameters).ToListAsync();
    }
    
    public async Task<int> ExecuteCommandAsync(string sql, params object[] parameters)
    {
        return await _context.Database.ExecuteSqlRawAsync(sql, parameters);
    }
    
    public async Task<IDictionary<string, IEnumerable<DbColumnInfo>>> GetDatabaseSchemaAsync()
    {
        try
        {
            // Assicurarsi che il contesto sia connesso
            await _context.Database.OpenConnectionAsync();
            
            // Usa la factory per ottenere il provider appropriato in base al tipo di database
            var schemaProvider = DatabaseSchemaProviderFactory.CreateProvider(_options.DatabaseType);
            
            // Usa il provider per ottenere lo schema
            return await schemaProvider.GetDatabaseSchemaAsync(_context.Database.GetConnectionString());
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Errore nel recupero dello schema del database: {ex.Message}");
            throw;
        }
    }
    
    public void Dispose()
    {
        _context?.Dispose();
    }
}