using Microsoft.EntityFrameworkCore;
using Serilog;
using System.Threading.Channels;
using TriliumMind.Data;
using TriliumMind.Models;
using TriliumMind.Services;
using TriliumMind.Workers;

namespace TriliumMind
{
    public class Program
    {

        public static async Task Main(string[] args)
        {
            var builder = Host.CreateApplicationBuilder(args);

            // Configure AppSettings
            var env = builder.Environment.EnvironmentName;
            builder.Configuration
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env}.json", optional: true, reloadOnChange: true)
                .AddEnvironmentVariables()
                .AddCommandLine(args);
            builder.Services.Configure<AppSettings>(builder.Configuration);

            Log.Logger = new LoggerConfiguration()
                .ReadFrom.Configuration(builder.Configuration)
                .Enrich.FromLogContext()
                .WriteTo.Console()
                .CreateLogger();

            // Register Config class (must be registered before DbContext)
            builder.Services.AddSingleton<AppConfigs>();

            // Register DbContext based on configuration
            builder.Services.AddScoped<IAppDbContext>(sp =>
            {
                var appConfigs = sp.GetRequiredService<AppConfigs>();
                var dbType = appConfigs.AppSettings.Database.Type;

                Log.Information("Configuring database type: {DbType}", dbType);

                return dbType.ToLower() switch
                {
                    "postgres" => new PostgresDbContext(appConfigs),
                    "sqlite" => new SqliteDbContext(appConfigs),
                    _ => throw new InvalidOperationException($"Unsupported database type: {dbType}")
                };
            });

            // Register Services
            builder.Services.AddSingleton<JiraService>();
            builder.Services.AddSingleton<TriliumService>();
            builder.Services.AddScoped<AppDbService>();

            // Register Workers
            builder.Services.AddHostedService<JiraWorker>();
            builder.Services.AddHostedService<TriliumWorker>();

            // Register Channels
            builder.Services.AddSingleton(Channel.CreateUnbounded<Issue>());

            var host = builder.Build();

            try
            {
                Log.Information("Starting database migration...");

                using var scope = host.Services.CreateScope();
                
                var db = scope.ServiceProvider.GetRequiredService<AppDbService>();
                await db.InitializeDatabaseAsync();
                
                var appCoinfigs = host.Services.GetRequiredService<AppConfigs>();
                appCoinfigs.RuntimeConfigs = await db.LoadConfigAsync();

                Log.Information("Database initialization completed successfully");
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Database migration failed. Application cannot start without a valid database connection.");
                Log.CloseAndFlush();
                Environment.Exit(1);
            }

            host.Run();
        }
    }
}