using Oms.Application.Dtos.Channels;
using Oms.Application.Dtos.Orders;
using Oms.Application.Services.Orders;
using Oms.Domain.ChannelsAggregate.Entities;
using Oms.Domain.ChannelsAggregate.Repositories;

namespace Oms.Application.Shared;

/// <summary>
/// 将价格分区（t_kpi_area + t_kpi_area_info）固化进卖价发布快照。
/// </summary>
public static class PriceAreaSnapshotHelper
{
    /// <summary>
    /// 按产品 PriceAreaId（或从卖价明细分区推断）加载分区头与明细写入快照。
    /// </summary>
    public static async Task ApplyPriceAreaToSnapshotAsync(
        SalesProductPricePublishSnapshotDto snapshot,
        SalesProduct product,
        IKpiAreaRepository kpiAreaRepository,
        CancellationToken cancellationToken = default)
    {
        var priceAreaId = await ResolvePriceAreaIdAsync(
            product,
            snapshot,
            kpiAreaRepository,
            cancellationToken);
        if (!priceAreaId.HasValue)
        {
            snapshot.PriceAreaId = null;
            snapshot.PriceAreaName = null;
            snapshot.PriceAreaInfos = [];
            return;
        }

        snapshot.PriceAreaId = priceAreaId;
        var area = await kpiAreaRepository.FirstOrDefaultAsync(x => x.Id == priceAreaId.Value, cancellationToken);
        snapshot.PriceAreaName = area?.Name;
        var infos = await kpiAreaRepository.GetAllInfosByAreaIdAsync(priceAreaId.Value, cancellationToken);
        snapshot.PriceAreaInfos = infos.Select(KpiAreaSnapshotMapper.MapToSnapshotRule).ToList();
    }

    internal static async Task<int?> ResolvePriceAreaIdAsync(
        SalesProduct product,
        SalesProductPricePublishSnapshotDto snapshot,
        IKpiAreaRepository kpiAreaRepository,
        CancellationToken cancellationToken = default)
    {
        if (product.PriceAreaId is > 0)
        {
            return product.PriceAreaId;
        }

        var zoneKeys = ParcelBillingCalculator.CollectDistinctDetailZoneKeys(snapshot);
        foreach (var zoneKey in zoneKeys)
        {
            if (!int.TryParse(zoneKey.Trim(), out var zoneId) || zoneId <= 0)
            {
                continue;
            }

            var area = await kpiAreaRepository.FirstOrDefaultAsync(x => x.Id == zoneId, cancellationToken);
            if (area != null)
            {
                return zoneId;
            }

            var info = await kpiAreaRepository.GetInfoByIdAsync(zoneId, cancellationToken);
            if (info != null)
            {
                return info.AreaId;
            }
        }

        return null;
    }
}