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

namespace Fitness_core_BE.Repos
{
    public class PlatformBillingRepository : IPlatformBillingRepository
    {
        // Platform billing is central-bucket (HexaFitness's own revenue relationship with
        // each gym); AccessDevices (used only to check device-billing eligibility) is tenant.
        private readonly CentralDbContext _context;
        private readonly TenantDbContext _tenant;

        public PlatformBillingRepository(CentralDbContext context, TenantDbContext tenant)
        {
            _context = context;
            _tenant = tenant;
        }

        public Task<List<ClientPackage>> GetPricingPlansAsync(CancellationToken ct = default)
        {
            return _context.ClientPackages
                .AsNoTracking()
                .OrderByDescending(package => package.IsDefault)
                .ThenBy(package => package.PackageName)
                .ToListAsync(ct);
        }

        public async Task<ClientPackage?> GetPackageByIdAsync(
            Guid packageId,
            CancellationToken ct = default)
        {
            return await _context.ClientPackages.FindAsync(new object[] { packageId }, ct);
        }

        public async Task AddPackageAsync(
            ClientPackage package,
            CancellationToken ct = default)
        {
            await _context.ClientPackages.AddAsync(package, ct);
        }

        public Task<List<ClientPackage>> GetOtherDefaultPackagesAsync(
            Guid exceptPackageId,
            CancellationToken ct = default)
        {
            return _context.ClientPackages
                .Where(package =>
                    package.IsDefault &&
                    package.ClientPackageId != exceptPackageId)
                .ToListAsync(ct);
        }

        public Task<ClientPackage?> GetDefaultPackageAsync(CancellationToken ct = default)
        {
            return _context.ClientPackages
                .FirstOrDefaultAsync(package => package.IsDefault, ct);
        }

        public async Task<ClientPackage?> GetActivePackageForClientAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            return await _context.ClientSubscriptions
                .AsNoTracking()
                .Where(subscription =>
                    subscription.FKClientId == clientId &&
                    subscription.IsActive)
                .OrderByDescending(subscription => subscription.OnboardDate)
                .Select(subscription => subscription.ClientPackage)
                .FirstOrDefaultAsync(ct);
        }

        public Task<Client?> GetClientByIdAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            return _context.Client
                .FirstOrDefaultAsync(client => client.ClientId == clientId, ct);
        }

        public Task<List<ClientSubscription>> GetActiveClientSubscriptionsAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            return _context.ClientSubscriptions
                .Where(subscription =>
                    subscription.FKClientId == clientId &&
                    subscription.IsActive)
                .ToListAsync(ct);
        }

        public Task<ClientSubscription?> GetActiveClientSubscriptionAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            return _context.ClientSubscriptions
                .Where(subscription =>
                    subscription.FKClientId == clientId &&
                    subscription.IsActive)
                .OrderByDescending(subscription => subscription.OnboardDate)
                .FirstOrDefaultAsync(ct);
        }

        public async Task AddClientSubscriptionAsync(
            ClientSubscription subscription,
            CancellationToken ct = default)
        {
            await _context.ClientSubscriptions.AddAsync(subscription, ct);
        }

        public Task<List<ClientDeviceBilling>> GetActiveDeviceBillingsAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            return _context.ClientDeviceBillings
                .Where(billing =>
                    billing.FKClientId == clientId &&
                    billing.IsActive)
                .ToListAsync(ct);
        }

        public Task<ClientDeviceBilling?> GetLatestActiveDeviceBillingAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            return _context.ClientDeviceBillings
                .Where(billing =>
                    billing.FKClientId == clientId &&
                    billing.IsActive)
                .OrderByDescending(billing => billing.AssignedAt)
                .FirstOrDefaultAsync(ct);
        }

        public async Task AddDeviceBillingAsync(
            ClientDeviceBilling billing,
            CancellationToken ct = default)
        {
            await _context.ClientDeviceBillings.AddAsync(billing, ct);
        }

        public Task<bool> HasActiveDeviceAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            return _tenant.AccessDevices.AnyAsync(device =>
                device.FKClientId == clientId &&
                device.IsActive, ct);
        }

        public Task<List<Guid>> GetMonthlyBillingCandidatesAsync(
            DateTime startOfMonth,
            CancellationToken ct = default)
        {
            return _context.Client
                .AsNoTracking()
                .Where(client =>
                    _context.ClientCard.Any(card =>
                        card.FK_ClientId == client.ClientId) &&
                    !_context.ClientInvoices.Any(invoice =>
                        invoice.ClientSubscription.FKClientId == client.ClientId &&
                        invoice.ClientInvoiceDate >= startOfMonth))
                .Select(client => client.ClientId)
                .ToListAsync(ct);
        }

        public Task<List<ClientInvoice>> GetInvoicesByStatusAsync(
            string status,
            bool newestFirst,
            CancellationToken ct = default)
        {
            var query = _context.ClientInvoices
                .AsNoTracking()
                .Include(invoice => invoice.ClientSubscription)
                    .ThenInclude(subscription => subscription.Client)
                        .ThenInclude(client => client.ClientBusinesses)
                .Where(invoice =>
                    status == "Outstanding"
                        ? invoice.Status == "Pending" || invoice.Status == "Partial"
                        : invoice.Status == status);

            query = newestFirst
                ? query.OrderByDescending(invoice => invoice.ClientInvoiceDate)
                : query.OrderBy(invoice => invoice.ClientInvoiceDate);

            return query.ToListAsync(ct);
        }

        public Task<ClientInvoice?> GetInvoiceWithClientAsync(
            Guid invoiceId,
            bool includeBusinesses,
            CancellationToken ct = default)
        {
            var query = _context.ClientInvoices
                .Include(invoice => invoice.ClientSubscription)
                    .ThenInclude(subscription => subscription.Client)
                .AsQueryable();

            if (includeBusinesses)
            {
                query = query.Include(invoice =>
                    invoice.ClientSubscription.Client.ClientBusinesses);
            }

            return query.FirstOrDefaultAsync(
                invoice => invoice.ClientInvoiceId == invoiceId, ct);
        }

        public Task<ClientCard?> GetClientCardAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            // The card billing charges: the active card marked primary. CardToken != null
            // excludes legacy rows created by ActivationService.ChargeAndActivateAsync before
            // real card onboarding existed — those were never confirmed by Payment-Service and
            // can't actually be charged, so they must never outrank (or stand in for) a real card.
            return _context.ClientCard
                .Where(card => card.FK_ClientId == clientId && card.IsActive && card.CardToken != null)
                .OrderByDescending(card => card.IsPrimary)
                .FirstOrDefaultAsync(ct);
        }

        public Task<List<ClientCard>> GetClientCardsAsync(
            Guid clientId,
            CancellationToken ct = default)
        {
            return _context.ClientCard
                .Where(card => card.FK_ClientId == clientId && card.IsActive && card.CardToken != null)
                .OrderByDescending(card => card.IsPrimary)
                .ToListAsync(ct);
        }

        public Task<ClientCard?> GetClientCardByTokenAsync(
            Guid clientId,
            string cardToken,
            CancellationToken ct = default)
        {
            return _context.ClientCard
                .FirstOrDefaultAsync(card => card.FK_ClientId == clientId && card.CardToken == cardToken, ct);
        }

        public async Task AddInvoiceAsync(
            ClientInvoice invoice,
            IReadOnlyCollection<ClientInvoiceItem> items,
            CancellationToken ct = default)
        {
            await _context.ClientInvoices.AddAsync(invoice, ct);
            await _context.ClientInvoiceItems.AddRangeAsync(items, ct);
        }

        public Task<DevicePricingConfig?> GetDevicePricingConfigAsync(
            CancellationToken ct = default)
        {
            return _context.DevicePricingConfigs.FirstOrDefaultAsync(ct);
        }

        public async Task AddDevicePricingConfigAsync(
            DevicePricingConfig config,
            CancellationToken ct = default)
        {
            await _context.DevicePricingConfigs.AddAsync(config, ct);
        }
    }
}