using IBKRTrader.Core.Configuration;
using IBKRTrader.Modules.Accounting.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;

namespace IBKRTrader.Modules.Accounting.Persistence;

/// <summary>
/// EF-Kontext des Accounting-Moduls (gleiche MariaDB, Tabellen mit Präfix acc_). Append-only Ledger mit
/// Autoincrement-PKs und Unique-Index auf dem Idempotenz-Schlüssel (kein Doppel-Buchen).
/// </summary>
public class AccountingDbContext : DbContext
{
    public AccountingDbContext(DbContextOptions<AccountingDbContext> options) : base(options) { }

    public DbSet<LedgerEntry> Ledger       => Set<LedgerEntry>();
    public DbSet<IngestRun>   IngestRuns   => Set<IngestRun>();
    public DbSet<RawSnapshot> RawSnapshots => Set<RawSnapshot>();
    public DbSet<FxRate>      FxRates      => Set<FxRate>();

    protected override void OnModelCreating(ModelBuilder b)
    {
        b.Entity<LedgerEntry>(e =>
        {
            e.ToTable("acc_ledger");
            e.HasKey(x => x.Id);
            e.Property(x => x.Id).ValueGeneratedOnAdd();
            e.Property(x => x.AccountId).HasMaxLength(30);
            e.Property(x => x.EventType).HasConversion<string>().HasMaxLength(20);
            e.Property(x => x.Symbol).HasMaxLength(30);
            e.Property(x => x.AssetClass).HasMaxLength(10);
            e.Property(x => x.Currency).HasMaxLength(5);
            e.Property(x => x.Side).HasMaxLength(10);
            e.Property(x => x.Source).HasMaxLength(40);
            e.Property(x => x.TransactionId).HasMaxLength(60);
            e.Property(x => x.IdempotencyKey).HasMaxLength(120);
            e.Property(x => x.Quantity).HasPrecision(28, 8);
            e.Property(x => x.PriceNative).HasPrecision(18, 6);
            e.Property(x => x.GrossBase).HasPrecision(28, 8);
            e.Property(x => x.FeeBase).HasPrecision(28, 8);
            e.Property(x => x.NetBase).HasPrecision(28, 8);
            e.HasIndex(x => x.IdempotencyKey).IsUnique();       // Idempotenz: kein Doppel-Buchen
            e.HasIndex(x => new { x.AccountId, x.Timestamp });
            e.HasIndex(x => x.EventType);
        });

        b.Entity<IngestRun>(e =>
        {
            e.ToTable("acc_ingest_runs");
            e.HasKey(x => x.Id);
            e.Property(x => x.Id).ValueGeneratedOnAdd();
            e.Property(x => x.AccountId).HasMaxLength(30);
            e.Property(x => x.Message).HasMaxLength(1000);
            e.Property(x => x.BalanceAnchorBase).HasPrecision(28, 8);
            e.Property(x => x.LedgerNetBase).HasPrecision(28, 8);
            e.Property(x => x.BalanceDeltaBase).HasPrecision(28, 8);
            e.HasIndex(x => new { x.AccountId, x.StartedAt });
        });

        b.Entity<RawSnapshot>(e =>
        {
            e.ToTable("acc_raw");
            e.HasKey(x => x.Id);
            e.Property(x => x.Id).ValueGeneratedOnAdd();
            e.Property(x => x.AccountId).HasMaxLength(30);
            e.Property(x => x.SourceKind).HasMaxLength(20);
            e.Property(x => x.Json).HasColumnType("longtext");
            e.HasIndex(x => x.IngestRunId);
        });

        b.Entity<FxRate>(e =>
        {
            e.ToTable("acc_fx_rates");
            e.HasKey(x => x.Date);
            e.Property(x => x.Date).HasColumnType("date");
            e.Property(x => x.UsdToEur).HasPrecision(18, 8);
            e.Property(x => x.Source).HasMaxLength(40);
        });
    }
}

/// <summary>Design-Time-Factory für EF-Tooling (dotnet ef). Connection aus env IBKRTRADER_MYSQL.</summary>
public class AccountingDbContextFactory : IDesignTimeDbContextFactory<AccountingDbContext>
{
    public AccountingDbContext CreateDbContext(string[] args)
    {
        var conn = Environment.GetEnvironmentVariable("IBKRTRADER_MYSQL")
            ?? "Server=localhost;Port=3306;Database=ibkrtrader;User ID=root;Password=;";

        var options = new DbContextOptionsBuilder<AccountingDbContext>()
            .UseMySql(conn, DatabaseServerVersion.Value)
            .Options;

        return new AccountingDbContext(options);
    }
}