using Marathon.Application.Abstractions;
using Marathon.Application.Storage;
using Marathon.Infrastructure.Export;
using Marathon.Infrastructure.Persistence.Repositories;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;

namespace Marathon.Infrastructure.Persistence;

/// <summary>
/// DI extension that wires up the persistence layer (DbContext, repositories, exporter).
/// Call this from the host's DI setup — do NOT call from DependencyInjection.cs (Phase 4).
/// </summary>
public static class PersistenceModule
{
    /// <summary>
    /// Registers EF Core DbContext, all repositories and the Excel exporter.
    /// Reads <c>Storage:DatabasePath</c> from <paramref name="config"/>.
    /// </summary>
    public static IServiceCollection AddMarathonPersistence(
        this IServiceCollection services,
        IConfiguration config)
    {
        services.AddOptions<StorageOptions>()
            .Bind(config.GetSection(StorageOptions.SectionName))
            .ValidateOnStart();

        services.AddDbContext<MarathonDbContext>((sp, opts) =>
        {
            var storageOptions = sp.GetRequiredService<IOptions<StorageOptions>>().Value;
            var dbPath = storageOptions.DatabasePath;

            // Ensure the directory exists
            var dir = Path.GetDirectoryName(dbPath);
            if (!string.IsNullOrEmpty(dir))
                Directory.CreateDirectory(dir);

            // Configure SQLite with WAL journal mode
            opts.UseSqlite(
                $"Data Source={dbPath}",
                sqliteOpts => sqliteOpts.CommandTimeout(30));
        });

        // Register initializer — the HOST must resolve this at startup and call InitializeAsync().
        // Example in Program.cs:
        //   using var scope = app.Services.CreateScope();
        //   await scope.ServiceProvider.GetRequiredService<MarathonDbContextInitializer>().InitializeAsync();
        services.AddScoped<MarathonDbContextInitializer>();

        services.AddScoped<IEventRepository, EventRepository>();
        services.AddScoped<ISnapshotRepository, SnapshotRepository>();
        services.AddScoped<IResultRepository, ResultRepository>();
        services.AddScoped<IAnomalyRepository, AnomalyRepository>();
        services.AddScoped<IPlacedBetRepository, PlacedBetRepository>();
        services.AddScoped<IExcelExporter, ExcelExporter>();

        return services;
    }
}