using System;
using System.Collections.Generic;
using System.Text.Json;
using FinlyticCore.Database;
using FinlyticCore.Dtos.TechnicalAnalysis;
using FinlyticCore.Entities.Settings;
using FinlyticTechnicals.Entities;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;

namespace FinlyticTechnicals.Database;

public class TechnicalAnalysisDbContext : DbContext, ISettingsDbContext
{
    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        PropertyNameCaseInsensitive = true,
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
        WriteIndented = false
    };

    public TechnicalAnalysisDbContext(DbContextOptions<TechnicalAnalysisDbContext> options) : base(options)
    {
    }

    public DbSet<SettingEntity> DynamicSettings => Set<SettingEntity>();
    public DbSet<FtaCandleEntity> FtaCandles => Set<FtaCandleEntity>();
    public DbSet<FtaTechnicalSetupEntity> FtaTechnicalSetups => Set<FtaTechnicalSetupEntity>();
    public DbSet<FtaDetectedPatternEntity> FtaDetectedPatterns => Set<FtaDetectedPatternEntity>();
    public DbSet<FtaMonitoredUniverseAssetEntity> MonitoredUniverseAssets => Set<FtaMonitoredUniverseAssetEntity>();

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        // 1. Settings Table
        modelBuilder.Entity<SettingEntity>(entity =>
        {
            entity.HasKey(e => e.Id);
            entity.HasIndex(e => e.Key).IsUnique();
        });

        // 2. FTA Candles Table & Composite Time-Series Index
        modelBuilder.Entity<FtaCandleEntity>(entity =>
        {
            entity.HasKey(e => e.Id);
            entity.HasIndex(e => new { e.Isin, e.Timeframe, e.TimestampUtc });
            entity.HasIndex(e => e.TimestampUtc);
        });

        // 3. JSONB Value Converters for Complex Types
        var exitPlanConverter = new ValueConverter<ExitPlan, string>(
            v => JsonSerializer.Serialize(v, JsonOptions),
            v => JsonSerializer.Deserialize<ExitPlan>(v, JsonOptions) ?? new ExitPlan(ExitStrategyType.FixedSingleTarget, 0m, new List<TakeProfitStage>(), null, null, null, null)
        );

        var patternsConverter = new ValueConverter<List<PatternResultDto>, string>(
            v => JsonSerializer.Serialize(v, JsonOptions),
            v => JsonSerializer.Deserialize<List<PatternResultDto>>(v, JsonOptions) ?? new List<PatternResultDto>()
        );

        var indicatorSnapshotConverter = new ValueConverter<Dictionary<string, decimal>, string>(
            v => JsonSerializer.Serialize(v, JsonOptions),
            v => JsonSerializer.Deserialize<Dictionary<string, decimal>>(v, JsonOptions) ?? new Dictionary<string, decimal>()
        );

        var extraDataConverter = new ValueConverter<Dictionary<string, object>?, string>(
            v => v == null ? "{}" : JsonSerializer.Serialize(v, JsonOptions),
            v => string.IsNullOrWhiteSpace(v) ? null : JsonSerializer.Deserialize<Dictionary<string, object>>(v, JsonOptions)
        );

        // 4. FTA Technical Setups Table & JSONB mappings
        modelBuilder.Entity<FtaTechnicalSetupEntity>(entity =>
        {
            entity.HasKey(e => e.SetupId);
            entity.HasIndex(e => new { e.Isin, e.IsActive, e.ExpiresAtUtc });
            entity.HasIndex(e => e.CreatedAtUtc);
            entity.HasIndex(e => e.QualityScore);
            entity.HasIndex(e => e.IsTopPick);
            entity.HasIndex(e => new { e.IsActive, e.IsTopPick, e.QualityScore });


            entity.Property(e => e.ExitPlan)
                .HasColumnType("jsonb")
                .HasConversion(exitPlanConverter);

            entity.Property(e => e.TriggeringPatterns)
                .HasColumnType("jsonb")
                .HasConversion(patternsConverter);

            entity.Property(e => e.IndicatorSnapshot)
                .HasColumnType("jsonb")
                .HasConversion(indicatorSnapshotConverter);
        });

        // 5. FTA Detected Patterns Table & JSONB mappings
        modelBuilder.Entity<FtaDetectedPatternEntity>(entity =>
        {
            entity.HasKey(e => e.Id);
            entity.HasIndex(e => new { e.Isin, e.DetectedAtUtc });
            entity.HasIndex(e => e.PatternType);
            entity.HasIndex(e => e.QualityScore);

            entity.Property(e => e.ExtraData)
                .HasColumnType("jsonb")
                .HasConversion(extraDataConverter);
        });

        // 6. Monitored Universe Assets Table (persisted backing store for TechnicalUniverseManager, cleared on
        // every service startup - see FtaMonitoredUniverseAssetEntity's doc comment)
        modelBuilder.Entity<FtaMonitoredUniverseAssetEntity>(entity =>
        {
            entity.HasKey(e => e.Isin);
            entity.HasIndex(e => e.Source);
            entity.HasIndex(e => e.ExpiresAtUtc);
        });
    }
}

public class TechnicalAnalysisDbContextFactory : IDesignTimeDbContextFactory<TechnicalAnalysisDbContext>
{
    public TechnicalAnalysisDbContext CreateDbContext(string[] args)
    {
        var optionsBuilder = new DbContextOptionsBuilder<TechnicalAnalysisDbContext>();
        optionsBuilder.UseNpgsql("Host=localhost;Database=finlytic_ta;Username=postgres;Password=postgres");
        return new TechnicalAnalysisDbContext(optionsBuilder.Options);
    }
}