using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using QYZH.InteractiveMagazine.Common.Helpers;
using QYZH.InteractiveMagazine.IService;
using QYZH.InteractiveMagazine.IService.Dto;
using QYZH.InteractiveMagazine.Models.Common;
using QYZH.InteractiveMagazine.Models.Settings;
using QYZH.InteractiveMagazine.Infrastructure.Auth;

namespace QYZH.InteractiveMagazine.Service;

/// <summary>
/// 微信小程序服务实现
/// </summary>
public class WeChatMiniProgramService : IWeChatMiniProgramService
{
    private readonly IConfiguration _configuration;
    private readonly ILogger<WeChatMiniProgramService> _logger;
    private const string Code2SessionUrl = "https://api.weixin.qq.com/sns/jscode2session";
    private const string GetPhoneNumberUrl = "https://api.weixin.qq.com/wxa/business/getuserphonenumber";

    /// <summary>
    /// 构造函数
    /// </summary>
    /// <param name="configuration">配置</param>
    /// <param name="logger">日志记录器</param>
    public WeChatMiniProgramService(IConfiguration configuration, ILogger<WeChatMiniProgramService> logger)
    {
        _configuration = configuration;
        _logger = logger;
    }

    /// <summary>
    /// 微信登录
    /// </summary>
    /// <param name="code">微信登录凭证</param>
    /// <returns>微信登录结果</returns>
    public async Task<WeChatLoginOutput> WeChatLoginAsync(string code)
    {
        _logger.LogInformation("微信登录尝试，code: {Code}", code);

        if (string.IsNullOrWhiteSpace(code))
        {
            throw new BusinessException("登录凭证不能为空", 400);
        }

        // 获取微信配置
        var weChatSettings = GetWeChatSettings();

        if (string.IsNullOrWhiteSpace(weChatSettings.AppId) || string.IsNullOrWhiteSpace(weChatSettings.AppSecret))
        {
            throw new BusinessException("微信配置不完整", 500);
        }

        // 演示版本：模拟调用微信code2session接口
        var openId = await SimulateCode2SessionAsync(code, weChatSettings);

        // 获取JWT配置并生成令牌
        var jwtSettings = GetJwtSettings();
        var token = JwtHelper.GenerateToken(1, "微信用户", jwtSettings);

        _logger.LogInformation("微信登录成功，openId: {OpenId}", openId);

        return new WeChatLoginOutput
        {
            Token = token,
            UserId = 1,
            UserName = "微信用户",
            OpenId = openId
        };
    }

    /// <summary>
    /// 获取手机号
    /// </summary>
    /// <param name="code">获取手机号凭证</param>
    /// <returns>手机号信息</returns>
    public async Task<WeChatPhoneNumberOutput> GetPhoneNumberAsync(string code)
    {
        _logger.LogInformation("获取微信手机号尝试，code: {Code}", code);

        if (string.IsNullOrWhiteSpace(code))
        {
            throw new BusinessException("获取手机号凭证不能为空", 400);
        }

        // 演示版本：模拟返回手机号
        var phoneNumber = await SimulateGetPhoneNumberAsync(code);

        _logger.LogInformation("获取微信手机号成功");

        return new WeChatPhoneNumberOutput
        {
            PhoneNumber = phoneNumber
        };
    }

    /// <summary>
    /// 模拟调用微信code2session接口
    /// </summary>
    /// <param name="code">登录凭证</param>
    /// <param name="weChatSettings">微信配置</param>
    /// <returns>openId</returns>
    private async Task<string> SimulateCode2SessionAsync(string code, WeChatSettings weChatSettings)
    {
        // 演示版本：模拟返回openId
        // 实际实现应调用微信API：
        // var url = $"{Code2SessionUrl}?appid={weChatSettings.AppId}&secret={weChatSettings.AppSecret}&js_code={code}&grant_type=authorization_code";
        // var response = await HttpHelper.GetAsync<dynamic>(url);
        // if (response?.errcode == 0) return response.openid;

        await Task.Delay(100); // 模拟网络请求延迟

        return $"demo_openid_{code.GetHashCode():X}";
    }

    /// <summary>
    /// 模拟调用微信获取手机号接口
    /// </summary>
    /// <param name="code">获取手机号凭证</param>
    /// <returns>手机号</returns>
    private async Task<string> SimulateGetPhoneNumberAsync(string code)
    {
        // 演示版本：模拟返回手机号
        // 实际实现应调用微信API获取access_token，然后调用获取手机号接口：
        // var tokenUrl = $"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={appId}&secret={appSecret}";
        // var tokenResponse = await HttpHelper.GetAsync<dynamic>(tokenUrl);
        // var accessToken = tokenResponse.access_token;
        // var phoneUrl = $"{GetPhoneNumberUrl}?access_token={accessToken}";
        // var phoneResponse = await HttpHelper.PostAsync<dynamic>(phoneUrl, new { code });

        await Task.Delay(100); // 模拟网络请求延迟

        return "13800138000";
    }

    /// <summary>
    /// 获取微信配置
    /// </summary>
    /// <returns>微信配置对象</returns>
    private WeChatSettings GetWeChatSettings()
    {
        return _configuration.GetSection("WeChatSettings").Get<WeChatSettings>()
            ?? new WeChatSettings
            {
                AppId = "demo_app_id",
                AppSecret = "demo_app_secret"
            };
    }

    /// <summary>
    /// 获取JWT配置
    /// </summary>
    /// <returns>JWT配置对象</returns>
    private JwtSettings GetJwtSettings()
    {
        return _configuration.GetSection("JwtSettings").Get<JwtSettings>()
            ?? new JwtSettings
            {
                Issuer = "QYZH.InteractiveMagazine",
                Audience = "QYZH.InteractiveMagazine.Client",
                SecretKey = "QYZH_InteractiveMagazine_SecretKey_2024",
                ExpiryMinutes = 120
            };
    }
}