using Fitness_core_BE.Interfaces;
using Fitness_core_BE.Models;
using Fitness_core_BE;
using Microsoft.EntityFrameworkCore;

namespace Fitness_core_BE.Repos
{
    public class ClientInvoiceRepository : IClientInvoiceRepository
    {
        private readonly CentralDbContext _context;

        public ClientInvoiceRepository(CentralDbContext context)
        {
            _context = context;
        }

        public async Task<ClientInvoice> CreateClientInvoiceFromSubscription(Guid subscriptionId)
        {
            var subscription = await _context.ClientSubscriptions
                .Include(cs => cs.ClientPackage)
                .Include(cs => cs.Client)
                    .ThenInclude(c => c.User)
                .FirstOrDefaultAsync(cs => cs.SubscriptionId == subscriptionId);

            if (subscription == null)
            {
                throw new Exception("Subscription not found");
            }

            var subItems = await _context.ClientSubItems
                .Where(si => si.FKClientSubscriptionId == subscriptionId && si.IsActive)
                .ToListAsync();

            decimal totalAmount = subscription.ClientPackage.PackagePrice;
            totalAmount += subItems.Sum(si => si.SubItemPrice);

            var clientCard = await _context.ClientCard
                .FirstOrDefaultAsync(cc => cc.FK_ClientId == subscription.Client.ClientId);

            if (clientCard == null)
            {
                throw new Exception("Client card not found");
            }

            var clientInvoice = new ClientInvoice
            {
                ClientInvoiceId = Guid.NewGuid(),
                FKClientSubscriptionId = subscriptionId,
                FKUserId = subscription.Client.FKUserId,
                FKClientCardId = clientCard.CardId,
                Amount = totalAmount,
                Status = "Pending",
                ClientInvoiceDate = DateTime.UtcNow
            };

            _context.ClientInvoices.Add(clientInvoice);

            var packageItem = new ClientInvoiceItem
            {
                ClientInvoiceItemId = Guid.NewGuid(),
                FKClientInvoiceId = clientInvoice.ClientInvoiceId,
                ItemName = subscription.ClientPackage.PackageName,
                ItemDescription = subscription.ClientPackage.PackageDescription,
                ItemPrice = subscription.ClientPackage.PackagePrice,
                CreatedAt = DateTime.UtcNow
            };

            _context.ClientInvoiceItems.Add(packageItem);

            foreach (var subItem in subItems)
            {
                var clientInvoiceItem = new ClientInvoiceItem
                {
                    ClientInvoiceItemId = Guid.NewGuid(),
                    FKClientInvoiceId = clientInvoice.ClientInvoiceId,
                    ItemName = subItem.SubItemName,
                    ItemDescription = subItem.SubItemDescription,
                    ItemPrice = subItem.SubItemPrice,
                    CreatedAt = DateTime.UtcNow
                };

                _context.ClientInvoiceItems.Add(clientInvoiceItem);
            }

            return clientInvoice;
        }

        public async Task<ClientInvoice?> GetClientInvoiceById(Guid clientInvoiceId)
        {
            return await _context.ClientInvoices
                .Include(i => i.ClientSubscription)
                    .ThenInclude(cs => cs.ClientPackage)
                .Include(i => i.ClientSubscription)
                    .ThenInclude(cs => cs.Client)
                .Include(i => i.User)
                .Include(i => i.ClientCard)
                .Include(i => i.Items)
                .FirstOrDefaultAsync(i => i.ClientInvoiceId == clientInvoiceId);
        }

        public async Task<List<ClientInvoice>> GetClientInvoicesByClientId(Guid clientId)
        {
            return await _context.ClientInvoices
                .Include(i => i.ClientSubscription)
                    .ThenInclude(cs => cs.ClientPackage)
                .Include(i => i.User)
                .Include(i => i.ClientCard)
                .Include(i => i.Items)
                .Where(i => i.ClientSubscription.FKClientId == clientId)
                .OrderByDescending(i => i.ClientInvoiceDate)
                .ToListAsync();
        }

        public async Task<List<ClientInvoice>> GetClientInvoicesByUserId(Guid userId)
        {
            return await _context.ClientInvoices
                .Include(i => i.ClientSubscription)
                    .ThenInclude(cs => cs.ClientPackage)
                .Include(i => i.ClientSubscription)
                    .ThenInclude(cs => cs.Client)
                .Include(i => i.ClientCard)
                .Include(i => i.Items)
                .Where(i => i.FKUserId == userId)
                .OrderByDescending(i => i.ClientInvoiceDate)
                .ToListAsync();
        }

        public async Task<ClientInvoice> UpdateClientInvoiceStatus(Guid clientInvoiceId, string status)
        {
            var clientInvoice = await _context.ClientInvoices.FindAsync(clientInvoiceId);
            
            if (clientInvoice == null)
            {
                throw new Exception("ClientInvoice not found");
            }

            clientInvoice.Status = status;

            return clientInvoice;
        }

    }
}