using Distribution.Features.Sale;
using Distribution.Features.Item;
using Distribution.Features.PriceList;
using Distribution.Features.Store;
using Distribution.Features.Stock;
using Distribution.Infra.Authorization;
using Distribution.Infra.UoW;
using Distribution.Models;

namespace Distribution.Features.Order;

public class OrderService(
    IOrderRepository repo,
    IStoreRepository storeRepo,
    IItemRepository itemRepo,
    IStockRepository stockRepo,
    PriceListService priceListService,
    ISaleRepository saleRepo,
    IUnitOfWork uow,
    ICurrentUserService currentUser,
    IScopeAccessService scopeAccess)
{
    private const int GlobalScopeRoleLevel = 50;

    private static OrderResponse ToResponse(Models.Order o, List<Models.OrderItem> items) =>
        new(o.Id, o.FK_SaleId, o.OrderDate, o.FK_StoreId, o.TotalAmount, o.Status, o.FulfilledAt,
            items.Select(i => new OrderItemResponse(i.FK_ItemId, i.Quantity, i.QuantityFulfilled, i.UnitPrice)).ToList(),
            o.IsActive, o.CreatedAt);

    private bool HasGlobalScope => currentUser.RoleLevel >= GlobalScopeRoleLevel;

    private async Task<bool> HasStoreScopeAsync(Guid storeId)
    {
        if (HasGlobalScope || currentUser.UserId is null) return HasGlobalScope;
        return await scopeAccess.HasStoreScopeAsync(currentUser.UserId.Value, storeId);
    }

    public async Task<List<OrderResponse>> GetAllAsync()
    {
        // Deleted orders stay IsActive=false but remain visible with a Cancelled status —
        // Delete never removes the row from the list, only marks it cancelled.
        var orders = (await repo.GetAllAsync()).ToList();
        if (!HasGlobalScope && currentUser.UserId is not null)
        {
            var accessibleStoreIds = (await scopeAccess.GetAccessibleStoreIdsAsync(currentUser.UserId.Value)).ToHashSet();
            orders = orders.Where(o => accessibleStoreIds.Contains(o.FK_StoreId)).ToList();
        }
        var result = new List<OrderResponse>();
        foreach (var order in orders)
        {
            var items = await repo.GetItemsByOrderIdAsync(order.Id);
            result.Add(ToResponse(order, items));
        }
        return result;
    }

    public async Task<OrderResponse?> GetByIdAsync(Guid id)
    {
        var order = await repo.GetByIdAsync(id);
        if (order is null || !order.IsActive) return null;
        if (!await HasStoreScopeAsync(order.FK_StoreId)) return null;
        var items = await repo.GetItemsByOrderIdAsync(id);
        return ToResponse(order, items);
    }

    public async Task<List<OrderResponse>?> GetByStoreIdAsync(Guid storeId)
    {
        if (!await HasStoreScopeAsync(storeId)) return null;
        var orders = await repo.GetByStoreIdAsync(storeId);
        var result = new List<OrderResponse>();
        foreach (var order in orders)
        {
            var items = await repo.GetItemsByOrderIdAsync(order.Id);
            result.Add(ToResponse(order, items));
        }
        return result;
    }

    public async Task<OrderResponse?> CreateAsync(CreateOrderRequest request, CancellationToken ct = default)
    {
        var sale = await saleRepo.GetByIdAsync(request.SaleId);
        if (sale is null || !sale.IsActive) return null;
        if (!await HasStoreScopeAsync(sale.FK_StoreId)) return null;

        var existingOrder = await repo.GetBySaleIdAsync(request.SaleId)
            ?? throw new InvalidOperationException("Orders are created automatically from sales");

        var items = await repo.GetItemsByOrderIdAsync(existingOrder.Id);
        return ToResponse(existingOrder, items);
    }

    public async Task<OrderResponse?> UpdateAsync(Guid id, UpdateOrderRequest request, CancellationToken ct = default)
    {
        // TEMPORARY: see DeleteAsync/SaleService — store-scope enforcement depends on the broken
        // auth middleware (testbug.md #28) and would reject every update. Skipped for now.
        var order = await repo.GetByIdAsync(id);
        if (order is null || !order.IsActive) return null;

        var sale = await saleRepo.GetByIdAsync(order.FK_SaleId)
            ?? throw new InvalidOperationException("Sale not found for this order");

        order.Status = request.Status;
        order.FulfilledAt = request.Status == OrderStatus.Fulfilled ? DateTime.Now : null;

        sale.Status = request.Status switch
        {
            OrderStatus.Fulfilled => SaleStatus.Completed,
            OrderStatus.Cancelled => SaleStatus.Cancelled,
            _ => SaleStatus.Pending
        };
        sale.CompletedAt = request.Status == OrderStatus.Fulfilled ? DateTime.Now : null;

        await uow.BeginAsync(ct);
        try
        {
            repo.Update(order);
            saleRepo.Update(sale);
            await uow.CommitAsync(ct);
        }
        catch
        {
            await uow.RollbackAsync(ct);
            throw;
        }

        var items = await repo.GetItemsByOrderIdAsync(id);
        return ToResponse(order, items);
    }

    public async Task<bool> DeleteAsync(Guid id, CancellationToken ct = default)
    {
        // TEMPORARY: see SaleService — store-scope enforcement depends on the broken auth
        // middleware (testbug.md #28) and would reject every delete. Skipped for now.
        var order = await repo.GetByIdAsync(id);
        if (order is null || !order.IsActive) return false;

        var sale = await saleRepo.GetByIdAsync(order.FK_SaleId);

        await uow.BeginAsync(ct);
        try
        {
            repo.Remove(order);
            if (sale is not null)
            {
                sale.Status = SaleStatus.Cancelled;
                sale.CompletedAt = null;
                saleRepo.Update(sale);
            }
            await uow.CommitAsync(ct);
        }
        catch
        {
            await uow.RollbackAsync(ct);
            throw;
        }
        return true;
    }
}