using Cleanuparr.Domain.Entities;
using Cleanuparr.Domain.Enums;
using Cleanuparr.Persistence.Converters;
using Cleanuparr.Persistence.Models.Configuration;
using Cleanuparr.Persistence.Models.Configuration.Arr;
using Cleanuparr.Persistence.Models.Configuration.DownloadCleaner;
using Cleanuparr.Persistence.Models.Configuration.General;
using Cleanuparr.Persistence.Models.Configuration.MalwareBlocker;
using Cleanuparr.Persistence.Models.Configuration.Notification;
using Cleanuparr.Persistence.Models.Configuration.QueueCleaner;
using Cleanuparr.Persistence.Models.Configuration.BlacklistSync;
using Cleanuparr.Persistence.Models.Configuration.Seeker;
using Cleanuparr.Persistence.Models.State;
using Cleanuparr.Persistence.Providers;
using Cleanuparr.Shared.Helpers;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.ChangeTracking;
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;

namespace Cleanuparr.Persistence;

/// <summary>
/// Database context for configuration data
/// </summary>
public class DataContext : DbContext
{
    public static SemaphoreSlim Lock { get; } = new(1, 1);
    
    public DbSet<GeneralConfig> GeneralConfigs { get; set; }
    
    public DbSet<DownloadClientConfig> DownloadClients { get; set; }
    
    public DbSet<QueueCleanerConfig> QueueCleanerConfigs { get; set; }
    
    public DbSet<StallRule> StallRules { get; set; }
    
    public DbSet<SlowRule> SlowRules { get; set; }
    
    public DbSet<ContentBlockerConfig> ContentBlockerConfigs { get; set; }
    
    public DbSet<DownloadCleanerConfig> DownloadCleanerConfigs { get; set; }
    
    public DbSet<QBitSeedingRule> QBitSeedingRules { get; set; }

    public DbSet<DelugeSeedingRule> DelugeSeedingRules { get; set; }

    public DbSet<TransmissionSeedingRule> TransmissionSeedingRules { get; set; }

    public DbSet<UTorrentSeedingRule> UTorrentSeedingRules { get; set; }

    public DbSet<RTorrentSeedingRule> RTorrentSeedingRules { get; set; }

    public DbSet<UnlinkedConfig> UnlinkedConfigs { get; set; }

    public DbSet<DeadTorrentConfig> DeadTorrentConfigs { get; set; }

    public DbSet<ArrConfig> ArrConfigs { get; set; }
    
    public DbSet<ArrInstance> ArrInstances { get; set; }
    
    public DbSet<NotificationConfig> NotificationConfigs { get; set; }
    
    public DbSet<NotifiarrConfig> NotifiarrConfigs { get; set; }
    
    public DbSet<AppriseConfig> AppriseConfigs { get; set; }
    
    public DbSet<NtfyConfig> NtfyConfigs { get; set; }

    public DbSet<PushoverConfig> PushoverConfigs { get; set; }
    
    public DbSet<TelegramConfig> TelegramConfigs { get; set; }

    public DbSet<DiscordConfig> DiscordConfigs { get; set; }

    public DbSet<GotifyConfig> GotifyConfigs { get; set; }

    public DbSet<BlacklistSyncHistory> BlacklistSyncHistory { get; set; }

    public DbSet<BlacklistSyncConfig> BlacklistSyncConfigs { get; set; }

    public DbSet<OrphanedFilesConfig> OrphanedFilesConfigs { get; set; }

    public DbSet<SeekerConfig> SeekerConfigs { get; set; }

    public DbSet<SeekerInstanceConfig> SeekerInstanceConfigs { get; set; }

    private readonly IDatabaseProvider _provider;

    public DataContext() : this(DatabaseProviderFactory.Current)
    {
    }

    public DataContext(IDatabaseProvider provider)
    {
        _provider = provider;
    }

    public DataContext(DbContextOptions<DataContext> options) : this(options, DatabaseProviderFactory.Current)
    {
    }

    public DataContext(DbContextOptions<DataContext> options, IDatabaseProvider provider) : base(options)
    {
        _provider = provider;
    }

    public static DataContext CreateStaticInstance()
    {
        IDatabaseProvider provider = DatabaseProviderFactory.Current;
        DbContextOptionsBuilder<DataContext> optionsBuilder = new();
        provider.ConfigureContext(optionsBuilder, DbContextKind.Data);
        return new DataContext(optionsBuilder.Options, provider);
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        SetDbContextOptions(optionsBuilder);
    }

    protected override void ConfigureConventions(ModelConfigurationBuilder configurationBuilder)
    {
        _provider.ConfigureConventions(configurationBuilder);
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        string? schema = _provider.GetSchema(DbContextKind.Data);
        if (schema is not null)
        {
            modelBuilder.HasDefaultSchema(schema);
        }

        modelBuilder.Entity<GeneralConfig>(entity =>
        {
            entity.ComplexProperty(e => e.Auth, cp =>
            {
                cp.Property(a => a.TrustedNetworks)
                    .HasConversion(
                        v => string.Join(',', v),
                        v => v.Split(',', StringSplitOptions.RemoveEmptyEntries).ToList());
            });
        });
        
        // Configure ArrConfig -> ArrInstance relationship
        modelBuilder.Entity<ArrConfig>(entity =>
        {
            entity.HasMany(a => a.Instances)
                  .WithOne(i => i.ArrConfig)
                  .HasForeignKey(i => i.ArrConfigId)
                  .OnDelete(DeleteBehavior.Cascade);
        });
        
        // Configure new notification system relationships
        modelBuilder.Entity<NotificationConfig>(entity =>
        {
            entity.HasOne(p => p.NotifiarrConfiguration)
                  .WithOne(c => c.NotificationConfig)
                  .HasForeignKey<NotifiarrConfig>(c => c.NotificationConfigId)
                  .OnDelete(DeleteBehavior.Cascade);
                  
            entity.HasOne(p => p.AppriseConfiguration)
                  .WithOne(c => c.NotificationConfig)
                  .HasForeignKey<AppriseConfig>(c => c.NotificationConfigId)
                  .OnDelete(DeleteBehavior.Cascade);
                  
            entity.HasOne(p => p.NtfyConfiguration)
                  .WithOne(c => c.NotificationConfig)
                  .HasForeignKey<NtfyConfig>(c => c.NotificationConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.HasOne(p => p.PushoverConfiguration)
                  .WithOne(c => c.NotificationConfig)
                  .HasForeignKey<PushoverConfig>(c => c.NotificationConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.HasOne(p => p.TelegramConfiguration)
                .WithOne(c => c.NotificationConfig)
                .HasForeignKey<TelegramConfig>(c => c.NotificationConfigId)
                .OnDelete(DeleteBehavior.Cascade);

            entity.HasOne(p => p.DiscordConfiguration)
                .WithOne(c => c.NotificationConfig)
                .HasForeignKey<DiscordConfig>(c => c.NotificationConfigId)
                .OnDelete(DeleteBehavior.Cascade);

            entity.HasOne(p => p.GotifyConfiguration)
                .WithOne(c => c.NotificationConfig)
                .HasForeignKey<GotifyConfig>(c => c.NotificationConfigId)
                .OnDelete(DeleteBehavior.Cascade);

            entity.HasIndex(p => p.Name).IsUnique();

        });

        // Configure PushoverConfig List<string> conversions
        modelBuilder.Entity<PushoverConfig>(entity =>
        {
            entity.Property(p => p.Devices)
                  .HasConversion(
                      v => string.Join(',', v),
                      v => v.Split(',', StringSplitOptions.RemoveEmptyEntries).ToList());

            entity.Property(p => p.Tags)
                  .HasConversion(
                      v => string.Join(',', v),
                      v => v.Split(',', StringSplitOptions.RemoveEmptyEntries).ToList());
        });

        modelBuilder.Entity<SeekerInstanceConfig>(entity =>
        {
            entity.HasOne(s => s.ArrInstance)
                  .WithMany()
                  .HasForeignKey(s => s.ArrInstanceId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.HasIndex(s => s.ArrInstanceId).IsUnique();

        });

        // Configure per-client seeding rule relationships and JSON list converters
        var jsonListConverter = new JsonStringListConverter();

        modelBuilder.Entity<QBitSeedingRule>(entity =>
        {
            entity.HasOne(s => s.DownloadClientConfig)
                  .WithMany()
                  .HasForeignKey(s => s.DownloadClientConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.Property(s => s.Categories).HasConversion(jsonListConverter);
            entity.Property(s => s.TrackerPatterns).HasConversion(jsonListConverter);
            entity.Property(s => s.TagsAny).HasConversion(jsonListConverter);
            entity.Property(s => s.TagsAll).HasConversion(jsonListConverter);
        });

        modelBuilder.Entity<DelugeSeedingRule>(entity =>
        {
            entity.HasOne(s => s.DownloadClientConfig)
                  .WithMany()
                  .HasForeignKey(s => s.DownloadClientConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.Property(s => s.Categories).HasConversion(jsonListConverter);
            entity.Property(s => s.TrackerPatterns).HasConversion(jsonListConverter);
        });

        modelBuilder.Entity<TransmissionSeedingRule>(entity =>
        {
            entity.HasOne(s => s.DownloadClientConfig)
                  .WithMany()
                  .HasForeignKey(s => s.DownloadClientConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.Property(s => s.Categories).HasConversion(jsonListConverter);
            entity.Property(s => s.TrackerPatterns).HasConversion(jsonListConverter);
            entity.Property(s => s.TagsAny).HasConversion(jsonListConverter);
            entity.Property(s => s.TagsAll).HasConversion(jsonListConverter);
        });

        modelBuilder.Entity<UTorrentSeedingRule>(entity =>
        {
            entity.HasOne(s => s.DownloadClientConfig)
                  .WithMany()
                  .HasForeignKey(s => s.DownloadClientConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.Property(s => s.Categories).HasConversion(jsonListConverter);
            entity.Property(s => s.TrackerPatterns).HasConversion(jsonListConverter);
        });

        modelBuilder.Entity<RTorrentSeedingRule>(entity =>
        {
            entity.HasOne(s => s.DownloadClientConfig)
                  .WithMany()
                  .HasForeignKey(s => s.DownloadClientConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.Property(s => s.Categories).HasConversion(jsonListConverter);
            entity.Property(s => s.TrackerPatterns).HasConversion(jsonListConverter);
        });

        // Configure per-client unlinked config relationship
        modelBuilder.Entity<UnlinkedConfig>(entity =>
        {
            entity.HasOne(u => u.DownloadClientConfig)
                  .WithMany()
                  .HasForeignKey(u => u.DownloadClientConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.HasIndex(u => u.DownloadClientConfigId).IsUnique();
        });

        // Configure per-client dead torrent config relationship
        modelBuilder.Entity<DeadTorrentConfig>(entity =>
        {
            entity.HasOne(d => d.DownloadClientConfig)
                  .WithMany()
                  .HasForeignKey(d => d.DownloadClientConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.HasIndex(d => d.DownloadClientConfigId).IsUnique();

            entity.Property(d => d.Categories).HasConversion(jsonListConverter);
        });

        // Configure per-client orphaned files config relationship
        modelBuilder.Entity<OrphanedFilesConfig>(entity =>
        {
            entity.HasOne(c => c.DownloadClientConfig)
                  .WithMany()
                  .HasForeignKey(c => c.DownloadClientConfigId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.HasIndex(c => c.DownloadClientConfigId).IsUnique();

            entity.Property(c => c.ScanDirectories).HasConversion(jsonListConverter);
            entity.Property(c => c.ExcludePatterns).HasConversion(jsonListConverter);
        });

        // Configure BlacklistSyncState relationships and indexes
        modelBuilder.Entity<BlacklistSyncHistory>(entity =>
        {
            // FK to DownloadClientConfig by DownloadClientId with cascade on delete
            entity.HasOne(s => s.DownloadClient)
                  .WithMany()
                  .HasForeignKey(s => s.DownloadClientId)
                  .OnDelete(DeleteBehavior.Cascade);

            entity.HasIndex(s => new { s.Hash, DownloadClientId = s.DownloadClientId }).IsUnique();
            entity.HasIndex(s => s.Hash);
        });
        
        foreach (var entityType in modelBuilder.Model.GetEntityTypes())
        {
            // Use OriginalString for Uri properties to preserve the exact input (including embedded credentials)
            foreach (var property in entityType.GetProperties().Where(p => p.ClrType == typeof(Uri)))
            {
                property.SetValueConverter(
                    new ValueConverter<Uri, string>(
                        v => v.OriginalString,
                        v => new Uri(v, UriKind.RelativeOrAbsolute)));

                property.SetValueComparer(new ValueComparer<Uri>(
                    (u1, u2) => u1 != null && u2 != null
                        ? u1.OriginalString == u2.OriginalString
                        : u1 == null && u2 == null,
                    u => u == null ? 0 : u.OriginalString.GetHashCode(),
                    u => u == null ? null! : new Uri(u.OriginalString, UriKind.RelativeOrAbsolute)));
            }
        }

        modelBuilder.ApplyLowercaseEnumConversions();
    }

    private void SetDbContextOptions(DbContextOptionsBuilder optionsBuilder)
    {
        if (optionsBuilder.IsConfigured)
        {
            return;
        }

        _provider.ConfigureContext(optionsBuilder, DbContextKind.Data);
    }
}