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

namespace Oms.Application.Services.System;

/// <summary>
/// 系统其他配置 API 服务。
/// </summary>
[ApiExplorerSettings(GroupName = "OMS-System")]
public class SystemOtherConfigService : ApplicationService
{
    private const string SecretMask = "******";

    private ISystemOtherConfigRepository SystemOtherConfigRepository =>
        LazyServiceProvider.GetRequiredService<ISystemOtherConfigRepository>();

    /// <summary>
    /// 查询系统其他配置列表。
    /// </summary>
    [HttpGet("/system/other-config/list")]
    public async Task<OmsPageResult<SystemOtherConfigOutput>> GetListAsync([FromQuery] SystemOtherConfigListInput input)
    {
        var predicate = BuildListPredicate(input);
        var pageIndex = OmsDocHelper.NormalizePage(input.Page);
        var pageSize = OmsDocHelper.NormalizePageSize(input.PageSize);
        var items = await SystemOtherConfigRepository.GetPagedListAsync(
            predicate,
            pageIndex,
            pageSize,
            new Dictionary<string, bool> { [nameof(SystemOtherConfig.Id)] = false });
        var total = await SystemOtherConfigRepository.CountAsync(predicate);

        return new OmsPageResult<SystemOtherConfigOutput>
        {
            Items = items.Select(x => MapOutput(x, maskSecret: true)).ToList(),
            Total = total
        };
    }

    /// <summary>
    /// 查询系统其他配置详情。
    /// </summary>
    [HttpGet("/system/other-config/detail")]
    public async Task<SystemOtherConfigOutput> GetDetailAsync([FromQuery] int id)
    {
        var entity = await GetConfigOrThrowAsync(id);
        return MapOutput(entity, maskSecret: false);
    }

    /// <summary>
    /// 新增系统其他配置。
    /// </summary>
    [HttpPost("/system/other-config/create")]
    public async Task CreateAsync(SystemOtherConfigCreateInput input)
    {
        await ValidateInputAsync(input, null);
        await SystemOtherConfigRepository.InsertAsync(new SystemOtherConfig
        {
            ConfigCode = input.ConfigCode.Trim(),
            ConfigName = input.ConfigName.Trim(),
            Enabled = input.Enabled,
            BaseUrl = NormalizeOptional(input.BaseUrl),
            AppKey = NormalizeOptional(input.AppKey),
            AppSecret = NormalizeOptional(input.AppSecret),
            TimeoutSeconds = NormalizeTimeoutSeconds(input.TimeoutSeconds),
            Remark = NormalizeOptional(input.Remark)
        });
    }

    /// <summary>
    /// 更新系统其他配置。
    /// </summary>
    [HttpPost("/system/other-config/update")]
    public async Task UpdateAsync(SystemOtherConfigUpdateInput input)
    {
        var entity = await GetConfigOrThrowAsync(input.Id);
        await ValidateInputAsync(input, entity.Id);
        var clearWeChatAccessToken = ShouldClearWeChatAccessToken(entity, input);
        entity.ConfigCode = input.ConfigCode.Trim();
        entity.ConfigName = input.ConfigName.Trim();
        entity.Enabled = input.Enabled;
        entity.BaseUrl = NormalizeOptional(input.BaseUrl);
        entity.AppKey = NormalizeOptional(input.AppKey);
        if (!ShouldKeepExistingSecret(input.AppSecret))
        {
            entity.AppSecret = NormalizeOptional(input.AppSecret);
        }

        entity.TimeoutSeconds = NormalizeTimeoutSeconds(input.TimeoutSeconds);
        entity.Remark = NormalizeOptional(input.Remark);
        if (clearWeChatAccessToken)
        {
            entity.AccessToken = null;
            entity.AccessTokenExpiresIn = 0;
            entity.AccessTokenUpdatedAt = null;
        }

        await SystemOtherConfigRepository.UpdateAsync(entity);
    }

    /// <summary>
    /// 删除系统其他配置。
    /// </summary>
    [HttpPost("/system/other-config/delete")]
    public async Task DeleteAsync(IdInput input)
    {
        var entity = await GetConfigOrThrowAsync(input.Id);
        await SystemOtherConfigRepository.DeleteAsync(entity);
    }

    private static Expression<Func<SystemOtherConfig, bool>> BuildListPredicate(SystemOtherConfigListInput input)
    {
        var keyword = input.Keyword?.Trim();
        return x =>
            string.IsNullOrWhiteSpace(keyword) ||
            x.ConfigCode.Contains(keyword) ||
            x.ConfigName.Contains(keyword);
    }

    private async Task<SystemOtherConfig> GetConfigOrThrowAsync(int id)
    {
        var entity = await SystemOtherConfigRepository.FirstOrDefaultAsync(x => x.Id == id);
        if (entity == null)
        {
            throw new BusinessException("配置不存在");
        }

        return entity;
    }

    private async Task ValidateInputAsync(SystemOtherConfigCreateInput input, int? excludeId)
    {
        if (string.IsNullOrWhiteSpace(input.ConfigCode))
        {
            throw new BusinessException("配置编码不能为空");
        }

        if (string.IsNullOrWhiteSpace(input.ConfigName))
        {
            throw new BusinessException("配置名称不能为空");
        }

        var configCode = input.ConfigCode.Trim();
        var existed = await SystemOtherConfigRepository.GetByConfigCodeAsync(configCode);
        if (existed != null && existed.Id != excludeId)
        {
            throw new BusinessException("配置编码已存在");
        }

        if (string.Equals(configCode, SystemOtherConfigCodes.TrackService, StringComparison.OrdinalIgnoreCase))
        {
            if (string.IsNullOrWhiteSpace(input.BaseUrl))
            {
                throw new BusinessException("轨迹服务地址不能为空");
            }

            if (string.IsNullOrWhiteSpace(input.AppKey))
            {
                throw new BusinessException("轨迹服务 AppKey 不能为空");
            }

            if (excludeId == null && ShouldKeepExistingSecret(input.AppSecret))
            {
                throw new BusinessException("轨迹服务 AppSecret 不能为空");
            }
        }
        else if (string.Equals(configCode, SystemOtherConfigCodes.ApiCenter, StringComparison.OrdinalIgnoreCase))
        {
            if (string.IsNullOrWhiteSpace(input.BaseUrl))
            {
                throw new BusinessException("API 中心服务地址不能为空");
            }

            if (string.IsNullOrWhiteSpace(input.AppKey))
            {
                throw new BusinessException("API 中心应用 AppKey 不能为空");
            }

            if (excludeId == null && ShouldKeepExistingSecret(input.AppSecret))
            {
                throw new BusinessException("API 中心应用 AppSecret 不能为空");
            }
        }
        else if (string.Equals(configCode, SystemOtherConfigCodes.PickupOpenApi, StringComparison.OrdinalIgnoreCase))
        {
            // 鉴权已改由 itfx 上游完成；本配置不再强制 AppKey
        }
        else if (string.Equals(configCode, SystemOtherConfigCodes.WeChatMp, StringComparison.OrdinalIgnoreCase))
        {
            if (string.IsNullOrWhiteSpace(input.AppKey))
            {
                throw new BusinessException("微信公众号 AppId 不能为空");
            }

            if (string.IsNullOrWhiteSpace(input.Remark))
            {
                throw new BusinessException("微信公众号 Token 不能为空");
            }

            if (excludeId == null && ShouldKeepExistingSecret(input.AppSecret))
            {
                throw new BusinessException("微信公众号 AppSecret 不能为空");
            }
        }
        else if (string.Equals(configCode, SystemOtherConfigCodes.PlatformShop, StringComparison.OrdinalIgnoreCase))
        {
            if (string.IsNullOrWhiteSpace(input.BaseUrl))
            {
                throw new BusinessException("店铺授权前端回调根地址不能为空");
            }
        }
        else if (IsPlatformShopAppConfig(configCode))
        {
            if (string.IsNullOrWhiteSpace(input.AppKey))
            {
                throw new BusinessException("平台 AppKey / PartnerId 不能为空");
            }

            if (excludeId == null && ShouldKeepExistingSecret(input.AppSecret))
            {
                throw new BusinessException("平台 AppSecret / PartnerKey 不能为空");
            }

            if (string.Equals(configCode, SystemOtherConfigCodes.PlatformShopShopee, StringComparison.OrdinalIgnoreCase)
                && !int.TryParse(input.AppKey.Trim(), out _))
            {
                throw new BusinessException("Shopee PartnerId 必须为数字");
            }

            if (string.IsNullOrWhiteSpace(input.BaseUrl))
            {
                throw new BusinessException("平台授权/API 地址不能为空");
            }
        }
    }

    private static bool IsPlatformShopAppConfig(string configCode) =>
        string.Equals(configCode, SystemOtherConfigCodes.PlatformShopLazada, StringComparison.OrdinalIgnoreCase)
        || string.Equals(configCode, SystemOtherConfigCodes.PlatformShopShopee, StringComparison.OrdinalIgnoreCase)
        || string.Equals(configCode, SystemOtherConfigCodes.PlatformShopTiktok, StringComparison.OrdinalIgnoreCase)
        || string.Equals(configCode, SystemOtherConfigCodes.PlatformShopTemu, StringComparison.OrdinalIgnoreCase);

    private static SystemOtherConfigOutput MapOutput(SystemOtherConfig entity, bool maskSecret)
    {
        return new SystemOtherConfigOutput
        {
            Id = entity.Id,
            ConfigCode = entity.ConfigCode,
            ConfigName = entity.ConfigName,
            Enabled = entity.Enabled,
            BaseUrl = entity.BaseUrl,
            AppKey = entity.AppKey,
            AppSecret = maskSecret ? MaskSecret(entity.AppSecret) : entity.AppSecret,
            TimeoutSeconds = entity.TimeoutSeconds,
            Remark = entity.Remark,
            CreateTime = entity.CreateTime,
            UpdateTime = OmsDocHelper.NullIfDefault(entity.UpdateTime)
        };
    }

    private static string? MaskSecret(string? secret) =>
        string.IsNullOrWhiteSpace(secret) ? secret : SecretMask;

    private static bool ShouldKeepExistingSecret(string? secret) =>
        string.IsNullOrWhiteSpace(secret) || string.Equals(secret.Trim(), SecretMask, StringComparison.Ordinal);

    private static bool ShouldClearWeChatAccessToken(SystemOtherConfig entity, SystemOtherConfigUpdateInput input)
    {
        if (!string.Equals(entity.ConfigCode, SystemOtherConfigCodes.WeChatMp, StringComparison.OrdinalIgnoreCase)
            && !string.Equals(input.ConfigCode.Trim(), SystemOtherConfigCodes.WeChatMp, StringComparison.OrdinalIgnoreCase))
        {
            return false;
        }

        var nextAppKey = NormalizeOptional(input.AppKey);
        if (!string.Equals(entity.AppKey, nextAppKey, StringComparison.Ordinal))
        {
            return true;
        }

        if (!ShouldKeepExistingSecret(input.AppSecret)
            && !string.Equals(entity.AppSecret, NormalizeOptional(input.AppSecret), StringComparison.Ordinal))
        {
            return true;
        }

        return false;
    }

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

    private static int NormalizeTimeoutSeconds(int timeoutSeconds) =>
        timeoutSeconds <= 0 ? 30 : timeoutSeconds;
}