using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.Extensions.Configuration;
using System;
using System.IO;

namespace GermanApp.Infrastructure.Data.DbContext;

/// <summary>
/// Factory for creating AppDbContext instances during design-time (e.g., EF migrations).
/// This is used by EF Core tools to create the DbContext without running the full application startup.
/// </summary>
public class AppDbContextFactory : IDesignTimeDbContextFactory<AppDbContext>
{
    public AppDbContext CreateDbContext(string[] args)
    {
        // Build configuration from appsettings.json
        var configuration = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json")
            .AddJsonFile("appsettings.Development.json", optional: true)
            .AddEnvironmentVariables()
            .Build();

        var builder = new DbContextOptionsBuilder<AppDbContext>();
        
        // Use PostgreSQL
        var connectionString = configuration.GetConnectionString("DefaultConnection") 
            ?? "Host=localhost;Port=5432;Database=DeutschLernen;Username=postgres;Password=postgres";
        
        builder.UseNpgsql(connectionString);

        return new AppDbContext(builder.Options);
    }
}