using Fake.Application;
using Microsoft.AspNetCore.Mvc;
using Oms.Application.Dtos.Shared;
using Oms.Application.Dtos.Warehouse;
using Oms.Application.Shared;

namespace Oms.Application.Services.Warehouse;

public partial class WarehouseService
{
    /// <summary>
    /// 查询库存列表。
    /// </summary>
    /// <param name="input">入参：库存分页查询条件。</param>
    /// <returns>按 SKU 汇总的库存分页结果。</returns>
    [HttpPost("/warehouse/inventory/list")]
    public async Task<OmsPageResult<WarehouseInventoryOutput>> GetInventoryListAsync(WarehouseInventoryListInput input)
    {
        var customerId = await ResolveCustomerIdAsync(input.CustomerId);
        var inventories = await InventoryRepository.GetListAsync(x =>
            x.CustomerId == customerId
            && x.Qty > 0
            && (!input.WarehouseId.HasValue || x.WarehouseId == input.WarehouseId.Value));

        var skuIds = inventories.Select(x => x.SkuId).Distinct().ToArray();
        var skus = skuIds.Length == 0
            ? []
            : await SkuRepository.GetListAsync(x => x.CustomerId == customerId && skuIds.Contains(x.Id));
        var skuMap = skus.ToDictionary(x => x.Id);

        var keyword = input.Keyword?.Trim();
        var grouped = inventories
            .GroupBy(x => new { x.SkuId, x.WarehouseId })
            .Select(g =>
            {
                skuMap.TryGetValue(g.Key.SkuId, out var sku);
                return new WarehouseInventoryOutput
                {
                    SkuId = g.Key.SkuId,
                    SkuCode = sku?.SkuCode ?? string.Empty,
                    SkuName = sku?.SkuName ?? string.Empty,
                    WarehouseId = g.Key.WarehouseId,
                    TotalQty = g.Sum(x => x.Qty),
                    BinCount = g.Count()
                };
            })
            .Where(x =>
                string.IsNullOrWhiteSpace(keyword)
                || x.SkuCode.Contains(keyword!, StringComparison.OrdinalIgnoreCase)
                || x.SkuName.Contains(keyword!, StringComparison.OrdinalIgnoreCase))
            .OrderBy(x => x.SkuCode)
            .ThenBy(x => x.WarehouseId)
            .ToList();

        var pageIndex = OmsDocHelper.NormalizePage(input.Page);
        var pageSize = OmsDocHelper.NormalizePageSize(input.PageSize);
        var skip = (pageIndex - 1) * pageSize;

        return new OmsPageResult<WarehouseInventoryOutput>
        {
            Items = grouped.Skip(skip).Take(pageSize).ToList(),
            Total = grouped.Count
        };
    }

    /// <summary>
    /// 查询 SKU 在各库位的库存明细。
    /// </summary>
    /// <param name="skuId">SKU ID。</param>
    /// <param name="warehouseId">仓库 ID。</param>
    /// <param name="customerId">客户 ID（可选）。</param>
    /// <returns>库位库存明细列表。</returns>
    [HttpGet("/warehouse/inventory/bin-detail")]
    public async Task<OmsItemsResult<WarehouseInventoryBinDetailOutput>> GetInventoryBinDetailAsync(
        [FromQuery] int skuId,
        [FromQuery] int warehouseId,
        [FromQuery] int? customerId = null)
    {
        if (skuId <= 0 || warehouseId <= 0)
        {
            throw new BusinessException("SKU 和仓库不能为空");
        }

        var resolvedCustomerId = await ResolveCustomerIdAsync(customerId);
        await GetSkuOrThrowAsync(resolvedCustomerId, skuId);

        var inventories = await InventoryRepository.GetListAsync(x =>
            x.CustomerId == resolvedCustomerId
            && x.WarehouseId == warehouseId
            && x.SkuId == skuId
            && x.Qty > 0);
        var binIds = inventories.Select(x => x.BinLocationId).Distinct().ToArray();
        var bins = binIds.Length == 0
            ? []
            : await BinLocationRepository.GetListAsync(x => binIds.Contains(x.Id));
        var binMap = bins.ToDictionary(x => x.Id);

        return new OmsItemsResult<WarehouseInventoryBinDetailOutput>
        {
            Items = inventories
                .OrderBy(x => x.BinLocationId)
                .Select(x =>
                {
                    binMap.TryGetValue(x.BinLocationId, out var bin);
                    return new WarehouseInventoryBinDetailOutput
                    {
                        Id = x.Id,
                        BinLocationId = x.BinLocationId,
                        BinCode = bin?.BinCode ?? string.Empty,
                        BinName = bin?.BinName,
                        Qty = x.Qty
                    };
                })
                .ToList()
        };
    }

    /// <summary>
    /// 库存移库（库位间调拨）。
    /// </summary>
    /// <param name="input">入参：源库位、目标库位与数量。</param>
    [HttpPost("/warehouse/inventory/relocate")]
    public async Task RelocateInventoryAsync(WarehouseInventoryRelocateInput input)
    {
        var customerId = await ResolveCustomerIdAsync(input.CustomerId);
        if (input.SourceBinLocationId == input.TargetBinLocationId)
        {
            throw new BusinessException("源库位与目标库位不能相同");
        }

        await GetSkuOrThrowAsync(customerId, input.SkuId);

        var source = await InventoryRepository.FirstOrDefaultAsync(x =>
            x.CustomerId == customerId
            && x.WarehouseId == input.WarehouseId
            && x.SkuId == input.SkuId
            && x.BinLocationId == input.SourceBinLocationId);
        if (source == null || source.Qty < input.Qty)
        {
            throw new BusinessException("源库位库存不足");
        }

        await UpsertInventoryQtyAsync(customerId, input.WarehouseId, input.SkuId, input.SourceBinLocationId, -input.Qty);
        await UpsertInventoryQtyAsync(customerId, input.WarehouseId, input.SkuId, input.TargetBinLocationId, input.Qty);
    }
}