@page "/database-connection"
@using DataConnection.Enums
@using DataConnection.Interfaces
@inject Data.DatabaseConnectionService DatabaseService
@inject IJSRuntime JSRuntime

<PageTitle>Connessione al Database</PageTitle>

<h3>Connessione al Database</h3>

<div class="row">
    <div class="col-md-6">
        <div class="card">
            <div class="card-header">
                Configurazione connessione
            </div>
            <div class="card-body">
                <div class="mb-3">
                    <label for="databaseType" class="form-label">Tipo di Database</label>
                    <select id="databaseType" class="form-select" @bind="DatabaseService.SelectedDatabaseType">
                        <option value="@DatabaseType.SqlServer">SQL Server</option>
                        <option value="@DatabaseType.MySql">MySQL</option>
                        <option value="@DatabaseType.PostgreSql">PostgreSQL</option>
                        <option value="@DatabaseType.Oracle">Oracle</option>
                        <option value="@DatabaseType.Sqlite">SQLite</option>
                        <option value="@DatabaseType.DB2">DB2</option>
                        <option value="@DatabaseType.SapHana">SAP HANA</option>
                    </select>
                </div>
                
                <div class="mb-3">
                    <label for="connectionString" class="form-label">Stringa di Connessione</label>
                    <input id="connectionString" class="form-control" @bind="DatabaseService.ConnectionString" placeholder="Es. Server=localhost;User Id=sa;Password=password;TrustServerCertificate=True" />
                </div>

                <div class="d-grid gap-2">
                    <button class="btn btn-primary" @onclick="TestConnection" disabled="@isLoading">
                        @if (isLoading)
                        {
                            <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
                            <span> Connessione in corso...</span>
                        }
                        else
                        {
                            <span>Test Connessione</span>
                        }
                    </button>
                </div>

                @if (DatabaseService.ErrorMessage != null)
                {
                    <div class="alert alert-danger mt-3">
                        @DatabaseService.ErrorMessage
                    </div>
                }
            </div>
        </div>
    </div>
    
    @if (DatabaseService.IsConnected)
    {
        <div class="col-md-6">
            <div class="card">
                <div class="card-header">
                    Database Disponibili
                </div>
                <div class="card-body">
                    <div class="mb-3">
                        <label for="selectDatabase" class="form-label">Seleziona Database</label>
                        <select id="selectDatabase" class="form-select" @bind="DatabaseService.SelectedDatabase">
                            <option value="">-- Seleziona un database --</option>
                            @foreach (var db in DatabaseService.AvailableDatabases)
                            {
                                <option value="@db">@db</option>
                            }
                        </select>
                    </div>
                    
                    @if (!string.IsNullOrEmpty(DatabaseService.SelectedDatabase) && databaseInfo != null)
                    {
                        <div class="mt-3">
                            <h5>Dettagli Database</h5>
                            <table class="table table-bordered">
                                <tbody>
                                    <tr>
                                        <th>Nome</th>
                                        <td>@databaseInfo?.Name</td>
                                    </tr>
                                    <tr>
                                        <th>Dimensione</th>
                                        <td>@databaseInfo?.SizeMB MB</td>
                                    </tr>
                                    <tr>
                                        <th>Data Creazione</th>
                                        <td>@databaseInfo?.CreationDate.ToString("dd/MM/yyyy HH:mm")</td>
                                    </tr>
                                    <tr>
                                        <th>Stato</th>
                                        <td>@databaseInfo?.Status</td>
                                    </tr>
                                    <tr>
                                        <th>Proprietario</th>
                                        <td>@databaseInfo?.Owner</td>
                                    </tr>
                                </tbody>
                            </table>
                            
                            <div class="d-grid gap-2 mt-3">
                                <button class="btn btn-success" @onclick="ConnectToDatabase" disabled="@isConnecting">
                                    @if (isConnecting)
                                    {
                                        <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
                                        <span> Connessione in corso...</span>
                                    }
                                    else
                                    {
                                        <span>Connetti al Database</span>
                                    }
                                </button>
                            </div>
                        </div>
                    }
                </div>
            </div>
        </div>
    }
</div>

@if (showSchemaInfo)
{
    <div class="row mt-4">
        <div class="col-12">
            <div class="card">
                <div class="card-header">
                    Schema del Database: @DatabaseService.SelectedDatabase
                </div>
                <div class="card-body">
                    @if (schemaInfo != null && schemaInfo.Count > 0)
                    {
                        <div class="table-responsive">
                            <table class="table table-striped table-hover">
                                <thead>
                                    <tr>
                                        <th>Tabella</th>
                                        <th>Colonne</th>
                                    </tr>
                                </thead>
                                <tbody>
                                    @foreach (var table in schemaInfo)
                                    {
                                        <tr>
                                            <td>@table.Key</td>
                                            <td>
                                                <ul class="list-unstyled">
                                                    @foreach (var column in table.Value)
                                                    {
                                                        <li>
                                                            <strong>@column.Name</strong> 
                                                            <span class="text-muted">(@column.DataType)</span>
                                                            @if (column.IsPrimaryKey)
                                                            {
                                                                <span class="badge bg-primary">PK</span>
                                                            }
                                                            @if (column.IsForeignKey)
                                                            {
                                                                <span class="badge bg-info">FK → @column.ReferencedTable</span>
                                                            }
                                                        </li>
                                                    }
                                                </ul>
                                            </td>
                                        </tr>
                                    }
                                </tbody>
                            </table>
                        </div>
                    }
                    else
                    {
                        <div class="alert alert-info">
                            Nessuna informazione sullo schema disponibile.
                        </div>
                    }
                </div>
            </div>
        </div>
    </div>
}

@code {
    private bool isLoading = false;
    private bool isConnecting = false;
    private bool showSchemaInfo = false;
    private DatabaseInfo databaseInfo;
    private IDictionary<string, IEnumerable<DbColumnInfo>> schemaInfo;

    protected override async Task OnInitializedAsync()
    {
        // Puoi impostare valori predefiniti, magari da configurazione
        DatabaseService.ConnectionString = "Server=localhost;User Id=sa;Password=password;TrustServerCertificate=True";
    }

    private async Task TestConnection()
    {
        try
        {
            isLoading = true;
            showSchemaInfo = false;
            databaseInfo = null;
            
            await DatabaseService.TestConnectionAsync();
            
            if (DatabaseService.IsConnected)
            {
                await DatabaseService.GetDatabasesInfoAsync();
            }
        }
        catch (Exception ex)
        {
            await JSRuntime.InvokeVoidAsync("console.error", "Errore connessione:", ex.Message);
        }
        finally
        {
            isLoading = false;
        }
    }

    private async Task ConnectToDatabase()
    {
        if (string.IsNullOrEmpty(DatabaseService.SelectedDatabase))
            return;

        try
        {
            isConnecting = true;
            showSchemaInfo = false;
            
            // Ottieni informazioni sul database selezionato
            if (DatabaseService.DatabasesInfo.TryGetValue(DatabaseService.SelectedDatabase, out var dbInfo))
            {
                databaseInfo = dbInfo;
            }
            
            // Qui dovresti implementare la connessione al database selezionato
            // e recuperare le informazioni sullo schema
            // Per questo esempio, simuliamo che sia avvenuto con successo
            await Task.Delay(1000); // Simulazione operazione asincrona
            
            showSchemaInfo = true;
            // In un'implementazione reale, qui dovresti eseguire:
            // schemaInfo = await databaseManager.GetDatabaseSchemaAsync();
            
            // Per ora creiamo dati di esempio
            schemaInfo = CreateSampleSchemaInfo();
        }
        catch (Exception ex)
        {
            await JSRuntime.InvokeVoidAsync("console.error", "Errore connessione database:", ex.Message);
            //DatabaseService.ErrorMessage = $"Errore nella connessione al database: {ex.Message}";
            showSchemaInfo = false;
        }
        finally
        {
            isConnecting = false;
        }
    }

    // Metodo temporaneo per generare dati di esempio - da sostituire con dati reali
    private IDictionary<string, IEnumerable<DbColumnInfo>> CreateSampleSchemaInfo()
    {
        var result = new Dictionary<string, IEnumerable<DbColumnInfo>>();
        
        // Tabella Customers
        var customerColumns = new List<DbColumnInfo>
        {
            new DbColumnInfo { Name = "Id", DataType = "int", IsPrimaryKey = true },
            new DbColumnInfo { Name = "Name", DataType = "nvarchar(100)" },
            new DbColumnInfo { Name = "Email", DataType = "nvarchar(255)" },
            new DbColumnInfo { Name = "Created", DataType = "datetime" }
        };
        
        // Tabella Orders
        var orderColumns = new List<DbColumnInfo>
        {
            new DbColumnInfo { Name = "Id", DataType = "int", IsPrimaryKey = true },
            new DbColumnInfo { Name = "CustomerId", DataType = "int", IsForeignKey = true, ReferencedTable = "Customers", ReferencedColumn = "Id" },
            new DbColumnInfo { Name = "OrderDate", DataType = "datetime" },
            new DbColumnInfo { Name = "TotalAmount", DataType = "decimal(18,2)" }
        };
        
        result.Add("Customers", customerColumns);
        result.Add("Orders", orderColumns);
        
        return result;
    }
}