using Microsoft.EntityFrameworkCore;
using HelpDesk.Models.Entities;

namespace HelpDesk.Data;

public class HelpDeskDbContext : DbContext
{
    public HelpDeskDbContext(DbContextOptions<HelpDeskDbContext> options) : base(options)
    {
    }

    public DbSet<User> Users => Set<User>();
    public DbSet<Ticket> Tickets => Set<Ticket>();
    public DbSet<TicketComment> TicketComments => Set<TicketComment>();
    public DbSet<Group> Groups => Set<Group>();
    public DbSet<SLAPolicy> SLAPolicies => Set<SLAPolicy>();
    public DbSet<KnowledgeBaseArticle> KnowledgeBaseArticles => Set<KnowledgeBaseArticle>();
    public DbSet<KnowledgeBaseCategory> KnowledgeBaseCategories => Set<KnowledgeBaseCategory>();
    public DbSet<ActivityLog> ActivityLogs => Set<ActivityLog>();

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

        // ── User ──────────────────────────────────────────────
        modelBuilder.Entity<User>(entity =>
        {
            entity.ToTable("users");
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Id).HasColumnName("id");
            entity.Property(e => e.FirstName).HasColumnName("first_name").HasMaxLength(100).IsRequired();
            entity.Property(e => e.LastName).HasColumnName("last_name").HasMaxLength(100).IsRequired();
            entity.Property(e => e.Email).HasColumnName("email").HasMaxLength(256).IsRequired();
            entity.Property(e => e.PasswordHash).HasColumnName("password_hash").HasMaxLength(500).IsRequired();
            entity.Property(e => e.Role).HasColumnName("role").HasMaxLength(50).IsRequired();
            entity.Property(e => e.IsActive).HasColumnName("is_active");
            entity.Property(e => e.PhoneNumber).HasColumnName("phone_number").HasMaxLength(50);
            entity.Property(e => e.AvatarUrl).HasColumnName("avatar_url").HasMaxLength(500);
            entity.Property(e => e.CreatedAt).HasColumnName("created_at");
            entity.Property(e => e.UpdatedAt).HasColumnName("updated_at");

            entity.HasIndex(e => e.Email).IsUnique().HasDatabaseName("ix_users_email");
        });

        // ── Ticket ────────────────────────────────────────────
        modelBuilder.Entity<Ticket>(entity =>
        {
            entity.ToTable("tickets");
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Id).HasColumnName("id");
            entity.Property(e => e.Title).HasColumnName("title").HasMaxLength(200).IsRequired();
            entity.Property(e => e.Description).HasColumnName("description").IsRequired();
            entity.Property(e => e.Status).HasColumnName("status").HasMaxLength(50).IsRequired();
            entity.Property(e => e.Priority).HasColumnName("priority").HasMaxLength(50).IsRequired();
            entity.Property(e => e.TicketNumber).HasColumnName("ticket_number").HasMaxLength(50).IsRequired();
            entity.Property(e => e.RequesterId).HasColumnName("requester_id");
            entity.Property(e => e.AssigneeId).HasColumnName("assignee_id");
            entity.Property(e => e.GroupId).HasColumnName("group_id");
            entity.Property(e => e.SlaPolicyId).HasColumnName("sla_policy_id");
            entity.Property(e => e.CreatedAt).HasColumnName("created_at");
            entity.Property(e => e.UpdatedAt).HasColumnName("updated_at");
            entity.Property(e => e.ResolvedAt).HasColumnName("resolved_at");
            entity.Property(e => e.ClosedAt).HasColumnName("closed_at");

            entity.HasIndex(e => e.TicketNumber).IsUnique().HasDatabaseName("ix_tickets_ticket_number");

            // Cascade delete: Ticket -> TicketComment
            entity.HasMany(e => e.Comments)
                  .WithOne(c => c.Ticket)
                  .HasForeignKey(c => c.TicketId)
                  .OnDelete(DeleteBehavior.Cascade);

            // Restrict: User FK references (Requester)
            entity.HasOne(e => e.Requester)
                  .WithMany(u => u.RequestedTickets)
                  .HasForeignKey(e => e.RequesterId)
                  .OnDelete(DeleteBehavior.Restrict);

            // Restrict: User FK references (Assignee)
            entity.HasOne(e => e.Assignee)
                  .WithMany(u => u.AssignedTickets)
                  .HasForeignKey(e => e.AssigneeId)
                  .OnDelete(DeleteBehavior.Restrict);

            entity.HasOne(e => e.Group)
                  .WithMany(g => g.Tickets)
                  .HasForeignKey(e => e.GroupId)
                  .OnDelete(DeleteBehavior.SetNull);

            entity.HasOne(e => e.SlaPolicy)
                  .WithMany(s => s.Tickets)
                  .HasForeignKey(e => e.SlaPolicyId)
                  .OnDelete(DeleteBehavior.SetNull);
        });

        // ── TicketComment ─────────────────────────────────────
        modelBuilder.Entity<TicketComment>(entity =>
        {
            entity.ToTable("ticket_comments");
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Id).HasColumnName("id");
            entity.Property(e => e.TicketId).HasColumnName("ticket_id");
            entity.Property(e => e.UserId).HasColumnName("user_id");
            entity.Property(e => e.Content).HasColumnName("content").IsRequired();
            entity.Property(e => e.IsInternal).HasColumnName("is_internal");
            entity.Property(e => e.CreatedAt).HasColumnName("created_at");

            // Restrict: User FK reference
            entity.HasOne(e => e.User)
                  .WithMany(u => u.Comments)
                  .HasForeignKey(e => e.UserId)
                  .OnDelete(DeleteBehavior.Restrict);
        });

        // ── Group ─────────────────────────────────────────────
        modelBuilder.Entity<Group>(entity =>
        {
            entity.ToTable("groups");
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Id).HasColumnName("id");
            entity.Property(e => e.Name).HasColumnName("name").HasMaxLength(100).IsRequired();
            entity.Property(e => e.Description).HasColumnName("description").HasMaxLength(500);
            entity.Property(e => e.CreatedAt).HasColumnName("created_at");
        });

        // ── SLAPolicy ─────────────────────────────────────────
        modelBuilder.Entity<SLAPolicy>(entity =>
        {
            entity.ToTable("sla_policies");
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Id).HasColumnName("id");
            entity.Property(e => e.Name).HasColumnName("name").HasMaxLength(100).IsRequired();
            entity.Property(e => e.Description).HasColumnName("description").HasMaxLength(500);
            entity.Property(e => e.ResponseTimeHours).HasColumnName("response_time_hours");
            entity.Property(e => e.ResolutionTimeHours).HasColumnName("resolution_time_hours");
            entity.Property(e => e.IsActive).HasColumnName("is_active");
            entity.Property(e => e.CreatedAt).HasColumnName("created_at");
        });

        // ── KnowledgeBaseArticle ──────────────────────────────
        modelBuilder.Entity<KnowledgeBaseArticle>(entity =>
        {
            entity.ToTable("knowledge_base_articles");
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Id).HasColumnName("id");
            entity.Property(e => e.Title).HasColumnName("title").HasMaxLength(200).IsRequired();
            entity.Property(e => e.Content).HasColumnName("content").IsRequired();
            entity.Property(e => e.CategoryId).HasColumnName("category_id");
            entity.Property(e => e.AuthorId).HasColumnName("author_id");
            entity.Property(e => e.IsPublished).HasColumnName("is_published");
            entity.Property(e => e.ViewCount).HasColumnName("view_count");
            entity.Property(e => e.CreatedAt).HasColumnName("created_at");
            entity.Property(e => e.UpdatedAt).HasColumnName("updated_at");

            entity.HasOne(e => e.Category)
                  .WithMany(c => c.Articles)
                  .HasForeignKey(e => e.CategoryId)
                  .OnDelete(DeleteBehavior.Restrict);

            entity.HasOne(e => e.Author)
                  .WithMany(u => u.Articles)
                  .HasForeignKey(e => e.AuthorId)
                  .OnDelete(DeleteBehavior.Restrict);
        });

        // ── KnowledgeBaseCategory ─────────────────────────────
        modelBuilder.Entity<KnowledgeBaseCategory>(entity =>
        {
            entity.ToTable("knowledge_base_categories");
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Id).HasColumnName("id");
            entity.Property(e => e.Name).HasColumnName("name").HasMaxLength(100).IsRequired();
            entity.Property(e => e.Description).HasColumnName("description").HasMaxLength(500);
            entity.Property(e => e.SortOrder).HasColumnName("sort_order");
            entity.Property(e => e.CreatedAt).HasColumnName("created_at");
        });

        // ── ActivityLog ───────────────────────────────────────
        modelBuilder.Entity<ActivityLog>(entity =>
        {
            entity.ToTable("activity_logs");
            entity.HasKey(e => e.Id);
            entity.Property(e => e.Id).HasColumnName("id");
            entity.Property(e => e.UserId).HasColumnName("user_id");
            entity.Property(e => e.EntityType).HasColumnName("entity_type").HasMaxLength(100).IsRequired();
            entity.Property(e => e.EntityId).HasColumnName("entity_id");
            entity.Property(e => e.Action).HasColumnName("action").HasMaxLength(100).IsRequired();
            entity.Property(e => e.Details).HasColumnName("details");
            entity.Property(e => e.CreatedAt).HasColumnName("created_at");

            entity.HasOne(e => e.User)
                  .WithMany(u => u.ActivityLogs)
                  .HasForeignKey(e => e.UserId)
                  .OnDelete(DeleteBehavior.Restrict);
        });

        // ── Seed Data ─────────────────────────────────────────
        SeedData(modelBuilder);
    }

    private static void SeedData(ModelBuilder modelBuilder)
    {
        var adminId = Guid.Parse("a0000000-0000-0000-0000-000000000001");
        var generalGroupId = Guid.Parse("b0000000-0000-0000-0000-000000000001");
        var ventasGroupId = Guid.Parse("b0000000-0000-0000-0000-000000000002");
        var desarrolloGroupId = Guid.Parse("b0000000-0000-0000-0000-000000000003");
        var standardSlaId = Guid.Parse("c0000000-0000-0000-0000-000000000001");
        var premiumSlaId = Guid.Parse("c0000000-0000-0000-0000-000000000002");
        var generalCategoryId = Guid.Parse("d0000000-0000-0000-0000-000000000001");
        var faqCategoryId = Guid.Parse("d0000000-0000-0000-0000-000000000002");
        var tutorialsCategoryId = Guid.Parse("d0000000-0000-0000-0000-000000000003");

        // SuperAdmin user
        modelBuilder.Entity<User>().HasData(new User
        {
            Id = adminId,
            FirstName = "Super",
            LastName = "Admin",
            Email = "admin@helpdesk.local",
            // BCrypt hash for "Admin123!"
            PasswordHash = "$2a$11$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldGxad68LJZdL17lhWy",
            Role = HelpDesk.Models.Enums.UserRole.SuperAdmin,
            IsActive = true,
            PhoneNumber = "+1-555-0100",
            CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc),
            UpdatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
        });

        // Default groups
        modelBuilder.Entity<Group>().HasData(
            new Group
            {
                Id = generalGroupId,
                Name = "Soporte General",
                Description = "Grupo de soporte técnico general",
                CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
            },
            new Group
            {
                Id = ventasGroupId,
                Name = "Ventas",
                Description = "Grupo de soporte de ventas",
                CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
            },
            new Group
            {
                Id = desarrolloGroupId,
                Name = "Desarrollo",
                Description = "Grupo de desarrollo de software",
                CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
            }
        );

        // SLA policies
        modelBuilder.Entity<SLAPolicy>().HasData(
            new SLAPolicy
            {
                Id = standardSlaId,
                Name = "Estándar",
                Description = "Política estándar: respuesta en 4 horas, resolución en 24 horas",
                ResponseTimeHours = 4,
                ResolutionTimeHours = 24,
                IsActive = true,
                CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
            },
            new SLAPolicy
            {
                Id = premiumSlaId,
                Name = "Premium",
                Description = "Política premium: respuesta en 1 hora, resolución en 8 horas",
                ResponseTimeHours = 1,
                ResolutionTimeHours = 8,
                IsActive = true,
                CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
            }
        );

        // Knowledge base categories
        modelBuilder.Entity<KnowledgeBaseCategory>().HasData(
            new KnowledgeBaseCategory
            {
                Id = generalCategoryId,
                Name = "General",
                Description = "Artículos generales de ayuda",
                SortOrder = 1,
                CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
            },
            new KnowledgeBaseCategory
            {
                Id = faqCategoryId,
                Name = "Preguntas Frecuentes",
                Description = "Preguntas frecuentes y respuestas",
                SortOrder = 2,
                CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
            },
            new KnowledgeBaseCategory
            {
                Id = tutorialsCategoryId,
                Name = "Tutoriales",
                Description = "Guías y tutoriales paso a paso",
                SortOrder = 3,
                CreatedAt = new DateTime(2024, 1, 1, 0, 0, 0, DateTimeKind.Utc)
            }
        );
    }
}