using Fake.DependencyInjection;
using Oms.Application.Dtos.Channels;
using Oms.Application.Dtos.Orders;
using Oms.Application.Integrations.Itfx;
using Oms.Application.Shared;
using Oms.Domain.ChannelsAggregate.Entities;
using Oms.Domain.ChannelsAggregate.Repositories;
using Oms.Domain.CustomersAggregate.Entities;
using Oms.Domain.CustomersAggregate.Repositories;
using Oms.Domain.OrdersAggregate.Entities;
using Oms.Domain.OrdersAggregate.Repositories;

namespace Oms.Application.Integrations.SmallBagTrack;

public interface ISmallBagTrackUpsertRequestBuilder
{
    Task<SmallBagTrackUpsertRequest> BuildAsync(
        Order order,
        OrderParcelReceiverInput? receiverInput = null,
        Customer? customer = null,
        CancellationToken cancellationToken = default);
}

/// <summary>
/// 组装 UpsertSmallBag 请求：ApiCode 优先订单/发布快照中的 supplierCode，再 fallback live itfx。
/// </summary>
internal sealed class SmallBagTrackUpsertRequestBuilder(
    IOrderRepository orderRepository,
    ICustomerRepository customerRepository,
    IServiceChannelRepository serviceChannelRepository,
    IServiceChannelGroupRepository serviceChannelGroupRepository,
    IItfxMetadataClient itfxMetadataClient,
    ISalesProductRepository salesProductRepository,
    AllocationProviderSnapshotEnricher allocationProviderSnapshotEnricher) : ISmallBagTrackUpsertRequestBuilder, IScopedDependency
{
    private const string RulesOperatorType = "rules";

    public async Task<SmallBagTrackUpsertRequest> BuildAsync(
        Order order,
        OrderParcelReceiverInput? receiverInput = null,
        Customer? customer = null,
        CancellationToken cancellationToken = default)
    {
        customer ??= await ResolveCustomerAsync(order, cancellationToken);

        var recipients = await orderRepository.GetRecipientsByOrderIdsAsync([order.Id], cancellationToken);
        var recipient = recipients.FirstOrDefault();
        var apiCode = await ResolveTrackApiCodeAsync(order, cancellationToken);

        return new SmallBagTrackUpsertRequest
        {
            Client = customer?.CustomerCode?.Trim() ?? string.Empty,
            OrderNo = order.ServiceNo?.Trim() ?? string.Empty,
            TrackNo = ResolveTrackNo(order),
            OtherNo = order.ClientNo?.Trim() ?? string.Empty,
            Channel = order.ChannelCode?.Trim() ?? string.Empty,
            Product = order.ProductCode?.Trim() ?? string.Empty,
            ApiCode = apiCode,
            Consignee = new SmallBagTrackConsigneeRequest
            {
                CountryCode = receiverInput?.CountryCode?.Trim() ?? order.ConsigneeCountry?.Trim() ?? string.Empty,
                Province = receiverInput?.Province?.Trim() ?? recipient?.Province?.Trim() ?? string.Empty,
                Postcode = receiverInput?.ZipCode?.Trim() ?? recipient?.ZipCode?.Trim() ?? string.Empty,
                City = receiverInput?.City?.Trim() ?? recipient?.City?.Trim() ?? string.Empty,
                Email = receiverInput?.Email?.Trim() ?? recipient?.Email?.Trim() ?? string.Empty
            }
        };
    }

    internal static string ResolveTrackNo(Order order)
    {
        var trackNo = order.TrackNo?.Trim();
        if (!string.IsNullOrWhiteSpace(trackNo))
        {
            return trackNo;
        }

        return order.ServiceNo?.Trim() ?? string.Empty;
    }

    internal static string? PickSupplierCodeFromProviders(
        IEnumerable<SalesProductAllocationProviderSnapshotDto> providers,
        string? channelCode)
    {
        var list = providers.ToList();
        if (list.Count == 0)
        {
            return null;
        }

        if (!string.IsNullOrWhiteSpace(channelCode))
        {
            var matched = list.FirstOrDefault(provider =>
                string.Equals(provider.ChannelCode?.Trim(), channelCode.Trim(), StringComparison.OrdinalIgnoreCase));
            var matchedCode = NullIfEmpty(matched?.SupplierCode);
            if (!string.IsNullOrWhiteSpace(matchedCode))
            {
                return matchedCode;
            }
        }

        foreach (var provider in list.OrderBy(x => x.SerialNumber))
        {
            var code = NullIfEmpty(provider.SupplierCode);
            if (!string.IsNullOrWhiteSpace(code))
            {
                return code;
            }
        }

        return null;
    }

    private async Task<Customer?> ResolveCustomerAsync(Order order, CancellationToken cancellationToken)
    {
        if (!order.CustomerId.HasValue)
        {
            return null;
        }

        return await customerRepository.FirstOrDefaultAsync(x => x.Id == order.CustomerId.Value, cancellationToken);
    }

    private async Task<string> ResolveTrackApiCodeAsync(Order order, CancellationToken cancellationToken)
    {
        var fromOrder = NullIfEmpty(order.DownstreamSupplierCode);
        if (!string.IsNullOrWhiteSpace(fromOrder))
        {
            return fromOrder;
        }

        var fromProductSnapshot = await ResolveApiCodeFromProductRulesSnapshotAsync(order, cancellationToken);
        if (!string.IsNullOrWhiteSpace(fromProductSnapshot))
        {
            return fromProductSnapshot;
        }

        var fromChannelSnapshot = await ResolveApiCodeFromChannelRulesSnapshotAsync(order, cancellationToken);
        if (!string.IsNullOrWhiteSpace(fromChannelSnapshot))
        {
            return fromChannelSnapshot;
        }

        var fromChannel = await ResolveApiCodeFromChannelCodeAsync(order.ChannelCode, cancellationToken);
        if (!string.IsNullOrWhiteSpace(fromChannel))
        {
            return fromChannel;
        }

        var provisional = await ResolveProvisionalApiCodeFromProductAsync(order, cancellationToken);
        return provisional ?? string.Empty;
    }

    private async Task<string?> ResolveApiCodeFromProductRulesSnapshotAsync(
        Order order,
        CancellationToken cancellationToken)
    {
        var productCode = order.ProductCode?.Trim();
        if (string.IsNullOrWhiteSpace(productCode))
        {
            return null;
        }

        var product = await salesProductRepository.GetByProductCodeAsync(productCode, cancellationToken);
        if (product == null)
        {
            return null;
        }

        var bindTime = order.CreateTime == default ? DateTime.Now : order.CreateTime;
        var rulesVersion = order.SalesProductRulesVersion?.Trim();
        SalesProductPublishRecord? rulesRecord = null;
        if (!string.IsNullOrWhiteSpace(rulesVersion)
            && !rulesVersion.StartsWith("LIVE-", StringComparison.OrdinalIgnoreCase))
        {
            rulesRecord = await salesProductRepository.GetPublishRecordByVersionAsync(
                product.Id,
                RulesOperatorType,
                rulesVersion,
                cancellationToken);
        }
        else
        {
            rulesRecord = await salesProductRepository.GetEffectivePublishRecordAsync(
                product.Id,
                RulesOperatorType,
                bindTime,
                cancellationToken);
        }

        var rulesSnapshot = OmsDocHelper.DeserializeRulesSnapshot(rulesRecord?.Content);
        if (rulesSnapshot?.Providers == null || rulesSnapshot.Providers.Count == 0)
        {
            return null;
        }

        var providers = rulesSnapshot.Providers;
        if (providers.Any(AllocationProviderSnapshotEnricher.NeedsDownstreamEnrichment))
        {
            await allocationProviderSnapshotEnricher.EnrichAsync(providers, cancellationToken);
        }

        return PickSupplierCodeFromProviders(providers, order.ChannelCode);
    }

    private async Task<string?> ResolveApiCodeFromChannelRulesSnapshotAsync(
        Order order,
        CancellationToken cancellationToken)
    {
        var channelCode = order.ChannelCode?.Trim();
        if (string.IsNullOrWhiteSpace(channelCode))
        {
            return null;
        }

        var channel = await serviceChannelRepository.GetByChannelCodeAsync(channelCode, cancellationToken);
        if (channel == null)
        {
            return null;
        }

        var bindTime = order.CreateTime == default ? DateTime.Now : order.CreateTime;
        var rulesRecord = await serviceChannelRepository.GetEffectivePublishRecordAsync(
            channel.Id,
            RulesOperatorType,
            bindTime,
            cancellationToken);
        if (rulesRecord?.Content == null)
        {
            return null;
        }

        var rulesSnapshot = OmsDocHelper.DeserializeJson<ServiceChannelRulesPublishSnapshotDto>(rulesRecord.Content);
        return NullIfEmpty(rulesSnapshot?.Downstream?.SupplierCode);
    }

    private async Task<string?> ResolveApiCodeFromChannelCodeAsync(
        string? channelCode,
        CancellationToken cancellationToken)
    {
        if (string.IsNullOrWhiteSpace(channelCode))
        {
            return null;
        }

        var channel = await serviceChannelRepository.GetByChannelCodeAsync(channelCode.Trim(), cancellationToken);
        if (channel == null)
        {
            return null;
        }

        return await ResolveApiCodeFromServiceChannelAsync(channel, cancellationToken);
    }

    private async Task<string?> ResolveApiCodeFromServiceChannelAsync(
        ServiceChannel channel,
        CancellationToken cancellationToken)
    {
        if (!channel.GroupId.HasValue || channel.GroupId.Value <= 0)
        {
            return null;
        }

        var group = await serviceChannelGroupRepository.FirstOrDefaultAsync(
            x => x.Id == channel.GroupId.Value,
            cancellationToken);
        if (group == null || group.ApiServiceProviderId <= 0)
        {
            return null;
        }

        var serviceProvider = await itfxMetadataClient.GetServiceProviderAsync(
            group.ApiServiceProviderId,
            cancellationToken);
        return NullIfEmpty(serviceProvider?.Code);
    }

    /// <summary>
    /// 创单尚未排货时，用销售产品排货规则里首个服务渠道的 API 服务商 code 作为轨迹 ApiCode 预占位。
    /// </summary>
    private async Task<string?> ResolveProvisionalApiCodeFromProductAsync(
        Order order,
        CancellationToken cancellationToken)
    {
        var productCode = order.ProductCode?.Trim();
        if (string.IsNullOrWhiteSpace(productCode))
        {
            return null;
        }

        var product = await salesProductRepository.GetByProductCodeAsync(productCode, cancellationToken);
        if (product == null)
        {
            return null;
        }

        var providers = await salesProductRepository.GetAllocationProvidersAsync(product.Id, cancellationToken);
        var channelIds = providers
            .Where(x => x.ServiceChannelId.HasValue)
            .Select(x => x.ServiceChannelId!.Value)
            .Distinct()
            .ToArray();
        if (channelIds.Length == 0)
        {
            return null;
        }

        var channels = await serviceChannelRepository.GetListAsync(x => channelIds.Contains(x.Id));
        foreach (var channel in channels.OrderBy(x => x.Id))
        {
            var apiCode = await ResolveApiCodeFromServiceChannelAsync(channel, cancellationToken);
            if (!string.IsNullOrWhiteSpace(apiCode))
            {
                return apiCode;
            }
        }

        return null;
    }

    private static string? NullIfEmpty(string? value) =>
        string.IsNullOrWhiteSpace(value) ? null : value.Trim();
}