using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;

namespace Gpulse.WCT.DataAnalyzer.Core.Infrastructure.LocalData;

/// <summary>
/// 数据库上下文工厂实现 - 支持SQLite和PostgreSQL切换
/// </summary>
public class DbContextFactory : IDbContextFactory
{
    private readonly IConfiguration _configuration;

    public DbContextFactory(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    public WctMinerDbContext CreateDbContext()
    {
        var dbType = _configuration["Database:Type"]?.ToLower() ?? "sqlite";
        var optionsBuilder = new DbContextOptionsBuilder<WctMinerDbContext>();

        switch (dbType)
        {
            case "postgresql":
            case "postgres":
                var pgConnStr = BuildPostgreSqlConnectionString();
                optionsBuilder.UseNpgsql(pgConnStr);
                break;

            case "sqlite":
            default:
                var dbPath = _configuration["Database:LocalPath"]
                    ?? _configuration["Database:Path"]
                    ?? "./data/database/local.db";
                EnsureDirectoryExists(dbPath);
                optionsBuilder.UseSqlite($"Data Source={dbPath}");
                break;
        }

#if DEBUG
        optionsBuilder.EnableSensitiveDataLogging();
        optionsBuilder.EnableDetailedErrors();
#endif

        var context = new WctMinerDbContext(optionsBuilder.Options);

        // 确保数据库和表结构已创建（适用于 SQLite）
        context.Database.EnsureCreated();

        return context;
    }

    private string BuildPostgreSqlConnectionString()
    {
        var host = _configuration["Database:Host"] ?? "localhost";
        var port = _configuration.GetValue("Database:Port", 5432);
        var name = _configuration["Database:Name"] ?? "wctminer";
        var user = _configuration["Database:User"] ?? "postgres";
        var password = _configuration["Database:Password"] ?? "";

        return $"Host={host};Port={port};Database={name};Username={user};Password={password}";
    }

    private static void EnsureDirectoryExists(string dbPath)
    {
        var directory = Path.GetDirectoryName(dbPath);
        if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
        {
            Directory.CreateDirectory(directory);
        }
    }
}