using Fitness_core_BE.Exceptions;
using Microsoft.EntityFrameworkCore;

namespace Fitness_core_BE.Helpers
{
    public class UserRoleHelper
    {
        // Admins/Customer/Client are central-bucket; Staff and CustomerSubscriptions are
        // tenant-bucket.
        private readonly CentralDbContext _central;
        private readonly TenantDbContext _context;

        public UserRoleHelper(CentralDbContext central, TenantDbContext context)
        {
            _central = central;
            _context = context;
        }

        public async Task<Guid?> GetAdminId(Guid userId)
        {
            var admin = await _central.Admins
                .AsNoTracking()
                .Where(a => a.FKUserId == userId && a.IsActive)
                .Select(a => a.AdminId)
                .FirstOrDefaultAsync();

            return admin == Guid.Empty ? null : admin;
        }
        public async Task<Guid> GetCusId(Guid userId)
        {
            var cus = await _central.Customer
                .AsNoTracking()
                .Where(a => a.FKUserId == userId && a.IsActive)
                .Select(a => a.CusId)
                .FirstOrDefaultAsync();

            if (cus == Guid.Empty)
                throw new NotFoundException("Customer not found or inactive");

            return cus;
        }

        public async Task<Guid?> GetStaffId(Guid userId)
        {
            var staff = await _context.Staff
                .AsNoTracking()
                .Where(s => s.FKUserId == userId && s.IsActive)
                .Select(s => s.StaffId)
                .FirstOrDefaultAsync();

            return staff == Guid.Empty ? null : staff;
        }

        public async Task<Guid> GetClientId(Guid userId)
        {
            var clientId = await _central.Client
                .AsNoTracking()
                .Where(c => c.FKUserId == userId)
                .Select(c => c.ClientId)
                .FirstOrDefaultAsync();

            // Staff can use the same tenant-scoped dashboard and real-time hub.
            if (clientId == Guid.Empty)
            {
                clientId = await _context.Staff
                    .AsNoTracking()
                    .Where(s => s.FKUserId == userId && s.IsActive)
                    .Select(s => s.FKClientId)
                    .FirstOrDefaultAsync();
            }

            if (clientId == Guid.Empty)
                throw new NotFoundException("Client not found");

            return clientId;
        }

        // Strict owner lookup used by RBAC decisions. GetClientId intentionally falls
        // back to a staff member's tenant so normal tenant-scoped data queries work;
        // that fallback must never make staff users appear to be gym owners.
        public async Task<Guid?> GetOwnedClientId(Guid userId)
        {
            var clientId = await _central.Client
                .AsNoTracking()
                .Where(c => c.FKUserId == userId)
                .Select(c => c.ClientId)
                .FirstOrDefaultAsync();

            return clientId == Guid.Empty ? null : clientId;
        }

        // Single-club deployment: exactly one Client row exists, so any caller that just needs
        // "the club" (rather than a specific user's club) can use this instead of a per-user
        // lookup. Used by TenantResolutionAttribute's Customer branch, which used to read a
        // caller-supplied X-Tenant-Id header to pick from many gyms -- there's only one now.
        public async Task<Guid> GetDefaultClientId()
        {
            var clientId = await _central.Client
                .AsNoTracking()
                .Select(c => c.ClientId)
                .FirstOrDefaultAsync();

            if (clientId == Guid.Empty)
                throw new NotFoundException("Club is not configured yet");

            return clientId;
        }

        public async Task<Guid> GetClientIdByCusId(Guid cusId)
        {
            var clientId = await _context.CustomerSubscriptions
                .AsNoTracking()
                .Where(s => s.FKCustomerId == cusId && s.IsActive)
                .Select(s => s.CustomerPlan.FKClientId)
                .FirstOrDefaultAsync();

            if (clientId == Guid.Empty)
                throw new NotFoundException("No active subscription found for customer");

            return clientId;
        }

        public async Task<string> GetUserType(Guid userId)
        {
            var isAdmin = await _central.Admins
                .AsNoTracking()
                .AnyAsync(a => a.FKUserId == userId && a.IsActive);
            if (isAdmin)
                return "Admin";
            var isCustomer = await _central.Customer
                .AsNoTracking()
                .AnyAsync(c => c.FKUserId == userId && c.IsActive);
            if (isCustomer)
                return "Customer";
            var isClient = await _central.Client
                .AsNoTracking()
                .AnyAsync(cl => cl.FKUserId == userId);
            if (isClient)
                return "Client";

            var isStaff = await _context.Staff
                .AsNoTracking()
                .AnyAsync(s => s.FKUserId == userId && s.IsActive);
            if (isStaff)
                return "Staff";
            throw new NotFoundException("User role not found or inactive");
        }
    }
}