using System.Linq.Expressions;
using Fake.Application;
using Microsoft.AspNetCore.Mvc;
using Oms.Application.Dtos.Orders;
using Oms.Application.Dtos.Shared;
using Oms.Application.Shared;
using Oms.Domain.OrdersAggregate.Entities;
using Oms.Domain.OrdersAggregate.Repositories;

namespace Oms.Application.Services.Orders;

public partial class OrderService
{
    private ICustomerSenderAddressRepository CustomerSenderAddressRepository =>
        LazyServiceProvider.GetRequiredService<ICustomerSenderAddressRepository>();

    /// <summary>
    /// 发件地址分页列表。
    /// </summary>
    [HttpPost("/order/sender-address/list")]
    public async Task<OmsPageResult<CustomerSenderAddressOutput>> GetSenderAddressListAsync(
        [FromBody] CustomerSenderAddressPaginatedInput input)
    {
        var customer = await OmsSessionHelper.ResolveSessionCustomerAsync(CustomerRepository, CurrentUser);
        var pageIndex = OmsDocHelper.NormalizePage(input.Page);
        var pageSize = OmsDocHelper.NormalizePageSize(input.PageSize);
        var predicate = BuildSenderAddressPredicate(customer.Id, input);

        var entities = await CustomerSenderAddressRepository.GetPagedListAsync(
            predicate,
            pageIndex,
            pageSize,
            new Dictionary<string, bool>
            {
                [nameof(CustomerSenderAddress.IsDefault)] = false,
                [nameof(CustomerSenderAddress.Id)] = false
            });
        var total = await CustomerSenderAddressRepository.CountAsync(predicate);
        var countryMap = await LoadCountryCodeMapAsync(entities.Select(x => x.Country).Where(x => x.HasValue).Select(x => x!.Value));

        return new OmsPageResult<CustomerSenderAddressOutput>
        {
            Items = entities.Select(x => MapSenderAddressOutput(x, countryMap)).ToList(),
            Total = total
        };
    }

    /// <summary>
    /// 发件地址详情。
    /// </summary>
    [HttpGet("/order/sender-address/detail")]
    public async Task<CustomerSenderAddressOutput> GetSenderAddressDetailAsync([FromQuery] int id)
    {
        var entity = await GetOwnedSenderAddressOrThrowAsync(id);
        var countryMap = await LoadCountryCodeMapAsync(entity.Country.HasValue ? [entity.Country.Value] : []);
        return MapSenderAddressOutput(entity, countryMap);
    }

    /// <summary>
    /// 新增发件地址。
    /// </summary>
    [HttpPost("/order/sender-address/create")]
    public async Task<object> CreateSenderAddressAsync([FromBody] CreateCustomerSenderAddressInput input)
    {
        var customer = await OmsSessionHelper.ResolveSessionCustomerAsync(CustomerRepository, CurrentUser);
        ValidateSenderAddressInput(input);
        var countryId = await ResolveSenderCountryIdAsync(input.CountryCode);

        if (input.IsDefault)
        {
            await CustomerSenderAddressRepository.ClearDefaultAsync(customer.Id);
        }

        var entity = new CustomerSenderAddress
        {
            CustomerId = customer.Id,
            AddressName = TrimOrNull(input.AddressName),
            SenderName = input.SenderName.Trim(),
            Company = TrimOrNull(input.Company),
            Country = countryId,
            Province = TrimOrNull(input.Province),
            City = TrimOrNull(input.City),
            ZipCode = TrimOrNull(input.ZipCode),
            StreetAddress1 = input.StreetAddress1.Trim(),
            StreetAddress2 = TrimOrNull(input.StreetAddress2),
            StreetAddress3 = TrimOrNull(input.StreetAddress3),
            HouseNumber = TrimOrNull(input.HouseNumber),
            Phone = TrimOrNull(input.Phone),
            TelePhone = TrimOrNull(input.TelePhone),
            Email = TrimOrNull(input.Email),
            IsDefault = input.IsDefault ? (byte)1 : (byte)0
        };

        entity = await CustomerSenderAddressRepository.InsertAsync(entity);
        return new { id = entity.Id };
    }

    /// <summary>
    /// 更新发件地址。
    /// </summary>
    [HttpPost("/order/sender-address/update")]
    public async Task UpdateSenderAddressAsync([FromBody] UpdateCustomerSenderAddressInput input)
    {
        var entity = await GetOwnedSenderAddressOrThrowAsync(input.Id);
        ValidateSenderAddressInput(input);
        var countryId = await ResolveSenderCountryIdAsync(input.CountryCode);

        if (input.IsDefault)
        {
            await CustomerSenderAddressRepository.ClearDefaultAsync(entity.CustomerId, entity.Id);
        }

        entity.AddressName = TrimOrNull(input.AddressName);
        entity.SenderName = input.SenderName.Trim();
        entity.Company = TrimOrNull(input.Company);
        entity.Country = countryId;
        entity.Province = TrimOrNull(input.Province);
        entity.City = TrimOrNull(input.City);
        entity.ZipCode = TrimOrNull(input.ZipCode);
        entity.StreetAddress1 = input.StreetAddress1.Trim();
        entity.StreetAddress2 = TrimOrNull(input.StreetAddress2);
        entity.StreetAddress3 = TrimOrNull(input.StreetAddress3);
        entity.HouseNumber = TrimOrNull(input.HouseNumber);
        entity.Phone = TrimOrNull(input.Phone);
        entity.TelePhone = TrimOrNull(input.TelePhone);
        entity.Email = TrimOrNull(input.Email);
        entity.IsDefault = input.IsDefault ? (byte)1 : (byte)0;

        await CustomerSenderAddressRepository.UpdateAsync(entity);
    }

    /// <summary>
    /// 删除发件地址（软删）。
    /// </summary>
    [HttpPost("/order/sender-address/delete")]
    public async Task DeleteSenderAddressAsync([FromBody] IdInput input)
    {
        var entity = await GetOwnedSenderAddressOrThrowAsync(input.Id);
        await CustomerSenderAddressRepository.DeleteAsync(entity);
    }

    /// <summary>
    /// 设为默认发件地址。
    /// </summary>
    [HttpPost("/order/sender-address/set-default")]
    public async Task SetDefaultSenderAddressAsync([FromBody] IdInput input)
    {
        var entity = await GetOwnedSenderAddressOrThrowAsync(input.Id);
        await CustomerSenderAddressRepository.ClearDefaultAsync(entity.CustomerId, entity.Id);
        entity.IsDefault = 1;
        await CustomerSenderAddressRepository.UpdateAsync(entity);
    }

    private async Task<CustomerSenderAddress> GetOwnedSenderAddressOrThrowAsync(int id)
    {
        var customer = await OmsSessionHelper.ResolveSessionCustomerAsync(CustomerRepository, CurrentUser);
        var entity = await CustomerSenderAddressRepository.GetOwnedAsync(id, customer.Id);
        if (entity == null)
        {
            throw new BusinessException("发件地址不存在");
        }

        return entity;
    }

    private static void ValidateSenderAddressInput(CreateCustomerSenderAddressInput input)
    {
        if (string.IsNullOrWhiteSpace(input.SenderName))
        {
            throw new BusinessException("发件人姓名不能为空");
        }

        if (string.IsNullOrWhiteSpace(input.StreetAddress1))
        {
            throw new BusinessException("发件地址不能为空");
        }
    }

    private async Task<int?> ResolveSenderCountryIdAsync(string? countryCode)
    {
        var code = string.IsNullOrWhiteSpace(countryCode) ? "CN" : countryCode.Trim();
        var country = await GetCountryOrThrowAsync(code, "发件国家不存在");
        return country.Id;
    }

    private static Expression<Func<CustomerSenderAddress, bool>> BuildSenderAddressPredicate(
        int customerId,
        CustomerSenderAddressPaginatedInput input)
    {
        var keyword = input.Keyword?.Trim();
        var onlyDefault = input.OnlyDefault;
        return x =>
            x.CustomerId == customerId
            && (!onlyDefault || x.IsDefault == 1)
            && (string.IsNullOrWhiteSpace(keyword)
                || (x.AddressName ?? string.Empty).Contains(keyword)
                || x.SenderName.Contains(keyword)
                || (x.Phone ?? string.Empty).Contains(keyword)
                || x.StreetAddress1.Contains(keyword));
    }

    private async Task<Dictionary<int, string>> LoadCountryCodeMapAsync(IEnumerable<int> countryIds)
    {
        var ids = countryIds.Distinct().ToArray();
        if (ids.Length == 0)
        {
            return new Dictionary<int, string>();
        }

        var countries = await CountryRepository.GetListAsync(x => ids.Contains(x.Id));
        return countries.ToDictionary(x => x.Id, x => x.CountryCode ?? string.Empty);
    }

    private static CustomerSenderAddressOutput MapSenderAddressOutput(
        CustomerSenderAddress entity,
        IReadOnlyDictionary<int, string> countryMap)
    {
        string? countryCode = null;
        if (entity.Country.HasValue && countryMap.TryGetValue(entity.Country.Value, out var code))
        {
            countryCode = code;
        }

        return new CustomerSenderAddressOutput
        {
            Id = entity.Id,
            CustomerId = entity.CustomerId,
            AddressName = entity.AddressName,
            SenderName = entity.SenderName,
            Company = entity.Company,
            Country = entity.Country,
            CountryCode = countryCode,
            Province = entity.Province,
            City = entity.City,
            ZipCode = entity.ZipCode,
            StreetAddress1 = entity.StreetAddress1,
            StreetAddress2 = entity.StreetAddress2,
            StreetAddress3 = entity.StreetAddress3,
            HouseNumber = entity.HouseNumber,
            Phone = entity.Phone,
            TelePhone = entity.TelePhone,
            Email = entity.Email,
            IsDefault = entity.IsDefault > 0,
            CreateTime = entity.CreateTime,
            UpdateTime = OmsDocHelper.NullIfDefault(entity.UpdateTime)
        };
    }

    private static string? TrimOrNull(string? value)
    {
        return string.IsNullOrWhiteSpace(value) ? null : value.Trim();
    }
}