using EasyCaching.Core;
using Microsoft.Extensions.Logging;
using System.Text.RegularExpressions;
using YD_Event.Application.Client.Dtos;

namespace YD_Event.Application.Client;

/// <summary>
/// 微信小程序认证接口
/// </summary>
[ApiDescriptionSettings("微信小程序接口")]
public class OAuthController : IDynamicApiController
{
    private readonly ISqlSugarRepository<YD_Event.Core.Entities.AppUser> _appUserRepository;
    private readonly ISqlSugarRepository<YD_Event.Core.Entities.Referee> _refereeRepository;
    private readonly IEasyCachingProvider _cachingProvider;
    private readonly IIdGenerator _idGenerator;
    private readonly ILogger<OAuthController> _logger;

    private const string SmsCodeCachePrefix = "sms:code:";
    private const long RefereeAccessTokenExpiredMinutes = 24 * 60;
    private const int DefaultAccessTokenExpiresInSeconds = 2 * 60 * 60;
    private const int RefereeAccessTokenExpiresInSeconds = 24 * 60 * 60;

    public OAuthController(
        ISqlSugarRepository<YD_Event.Core.Entities.AppUser> appUserRepository,
        ISqlSugarRepository<YD_Event.Core.Entities.Referee> refereeRepository,
        IEasyCachingProvider cachingProvider,
        IIdGenerator idGenerator,
        ILogger<OAuthController> logger)
    {
        _appUserRepository = appUserRepository;
        _refereeRepository = refereeRepository;
        _cachingProvider = cachingProvider;
        _idGenerator = idGenerator;
        _logger = logger;
    }

    /// <summary>
    /// 登录接口（支持手机号密码登录和短信验证码登录；检录员仅支持密码）
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [HttpPost("login")]
    [AllowAnonymous]
    public async Task<MiniProgramLoginOutput> Login([FromBody] MiniProgramLoginInput input)
    {
        var mobile = input.Mobile?.Trim() ?? string.Empty;
        if (!Regex.IsMatch(mobile, @"^1[3-9]\d{9}$")) throw Oops.Bah("手机号格式不正确");

        var isPasswordLogin = !string.IsNullOrEmpty(input.Password);
        var isSmsLogin = !string.IsNullOrEmpty(input.VerificationCode);

        if (!isPasswordLogin && !isSmsLogin)
        {
            throw Oops.Bah("请选择密码登录或短信验证码登录");
        }

        if (isPasswordLogin && isSmsLogin)
        {
            throw Oops.Bah("请选择一种登录方式");
        }

        YD_Event.Core.Entities.AppUser? appUser;
        if (isPasswordLogin)
        {
            appUser = await _appUserRepository.GetFirstAsync(x => !x.DeleteMark && x.Mobile == mobile);
        }
        else
        {
            appUser = await _appUserRepository.GetFirstAsync(x => !x.DeleteMark && x.Mobile == mobile);
        }
        
        // 统一的未注册账户判断逻辑
        bool isRegistered = appUser != null && !string.IsNullOrEmpty(appUser.Password);
        
        if (!isRegistered)
        {
            if (appUser == null || string.IsNullOrEmpty(appUser.Password))
            {
                throw Oops.Bah("未注册过账户");
            }
        }

        if (isPasswordLogin)
        {
            var encryptedPassword = MD5Encryption.Encrypt($"{_idGenerator.Encode(appUser.Id)}{input.Password}");
            if (appUser.Password != encryptedPassword)
            {
                throw Oops.Bah("密码错误");
            }
        }
        else
        {
            if (appUser.MiniProgramRole == MiniProgramRole.Checker)
            {
                throw Oops.Bah("检录员仅支持手机号密码登录");
            }
            var cacheKey = $"{SmsCodeCachePrefix}{mobile}";
            var cachedCodeResult = _cachingProvider.Get<string>(cacheKey);
            string cachedCode = cachedCodeResult.Value;
            if (!cachedCodeResult.HasValue || cachedCode != input.VerificationCode)
            {
                throw Oops.Bah("验证码错误或已过期");
            }
            _cachingProvider.Remove(cacheKey);
        }

        (string accessToken, string refreshToken) = GenerateTokens(appUser);

        var userInfo = new 
        { 
            appUser.Name, 
            appUser.Id, 
            appUser.Mobile, 
            appUser.Avatar, 
            appUser.NickName,
            Role = ToRoleCode(appUser.MiniProgramRole),
            RoleType = (int)NormalizeRole(appUser.MiniProgramRole)
        };

        return new MiniProgramLoginOutput
        {
            AccessToken = accessToken,
            RefreshToken = refreshToken,
            ExpiresIn = appUser.MiniProgramRole == MiniProgramRole.Referee
                ? RefereeAccessTokenExpiresInSeconds
                : DefaultAccessTokenExpiresInSeconds,
            UserInfo = userInfo
        };
    }

    /// <summary>
    /// 注册接口
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [HttpPost("register")]
    [AllowAnonymous]
    [UnitOfWork]
    public async Task<MiniProgramRegisterOutput> Register([FromBody] MiniProgramRegisterInput input)
    {
        var cacheKey = $"{SmsCodeCachePrefix}{input.Mobile}";
        var cachedCodeResult = _cachingProvider.Get<string>(cacheKey);
        string cachedCode = cachedCodeResult.Value;
        if (!cachedCodeResult.HasValue || cachedCode != input.VerificationCode)
        {
            throw Oops.Bah("验证码错误或已过期");
        }
        _cachingProvider.Remove(cacheKey);

        // 检查手机号是否已存在
        var existingUser = await _appUserRepository.GetFirstAsync(x => x.Mobile == input.Mobile && !x.DeleteMark);

        YD_Event.Core.Entities.AppUser appUser;
        bool isNewUser = false;

        if (existingUser != null)
        {
            // 手机号已存在，检查是否已设置密码
            if (!string.IsNullOrEmpty(existingUser.Password))
            {
                throw Oops.Bah("该手机号已注册");
            }

            // 未设置密码，更新现有记录
            appUser = existingUser;
            var encryptedPassword = MD5Encryption.Encrypt($"{_idGenerator.Encode(appUser.Id)}{input.Password}");
            appUser.Password = encryptedPassword;
            appUser.MiniProgramRole = ParseRole(input);
            appUser.PersonType = ParsePersonType(input, appUser.MiniProgramRole);
            appUser.UpdatedTime = DateTime.Now;
        }
        else
        {
            // 手机号不存在，创建新用户
            isNewUser = true;
            long appUserId = _idGenerator.NewLong();
            var encryptedPassword = MD5Encryption.Encrypt($"{_idGenerator.Encode(appUserId)}{input.Password}");
            var role = ParseRole(input);

            appUser = new YD_Event.Core.Entities.AppUser
            {
                Id = appUserId,
                Name = input.NickName ?? input.Mobile,
                NickName = input.NickName,
                Avatar = input.Avatar,
                Mobile = input.Mobile,
                Password = encryptedPassword,
                PersonType = ParsePersonType(input, role),
                MiniProgramRole = role,
                Status = AvailabilityStatus.Enable,
                AuditStatus = AuditStatus.PendingSubmission,
                CreatedTime = DateTime.Now,
                CreatedUserId = 0
            };
        }

        if (isNewUser)
        {
            await _appUserRepository.InsertAsync(appUser);
        }
        else
        {
            await _appUserRepository.UpdateAsync(appUser);
        }

        if (appUser.MiniProgramRole == MiniProgramRole.Referee)
        {
            await EnsureRefereeProfileAsync(appUser);
        }

        return new MiniProgramRegisterOutput
        {
            UserId = appUser.Id,
            Mobile = appUser.Mobile,
            NickName = appUser.NickName,
            Role = ToRoleCode(appUser.MiniProgramRole),
            RoleType = (int)NormalizeRole(appUser.MiniProgramRole),
            PersonType = (int)appUser.PersonType,
            RegisterTime = isNewUser ? appUser.CreatedTime : (appUser.UpdatedTime ?? appUser.CreatedTime)
        };
    }

    /// <summary>
    /// 裁判账号注册完成后立即建立未提交档案，使其能够在后台裁判管理中显示。
    /// 已由后台提前建档的裁判按手机号关联账号，并保留原审核状态及认证资料。
    /// </summary>
    private async Task EnsureRefereeProfileAsync(YD_Event.Core.Entities.AppUser appUser)
    {
        var referee = await _refereeRepository.GetFirstAsync(x =>
            !x.DeleteMark && (x.AppUserId == appUser.Id || x.Mobile == appUser.Mobile));
        if (referee != null)
        {
            if (referee.AppUserId.HasValue && referee.AppUserId.Value != appUser.Id)
                throw Oops.Bah("该手机号已关联其他裁判账号，请联系赛事组委会处理");

            if (!referee.AppUserId.HasValue)
            {
                referee.AppUserId = appUser.Id;
                referee.UpdatedUserId = appUser.Id;
                referee.UpdatedTime = DateTime.Now;
                await _refereeRepository.UpdateAsync(referee);
            }
            return;
        }

        await _refereeRepository.InsertAsync(new YD_Event.Core.Entities.Referee
        {
            Id = _idGenerator.NextId(),
            AppUserId = appUser.Id,
            Name = appUser.Name ?? appUser.NickName ?? appUser.Mobile,
            Mobile = appUser.Mobile,
            ProvinceCode = string.Empty,
            ProvinceName = string.Empty,
            CityCode = string.Empty,
            CityName = string.Empty,
            DistrictCode = string.Empty,
            DistrictName = string.Empty,
            Level = 0,
            CertificateUrl = string.Empty,
            Roles = RefereeRole.None,
            AuditStatus = AuditStatus.PendingSubmission,
            Status = AvailabilityStatus.Enable,
            CreatedUserId = appUser.Id,
            CreatedTime = DateTime.Now
        });
    }

    /// <summary>
    /// 重置密码接口
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [HttpPost("reset-password")]
    [AllowAnonymous]
    public async Task ResetPassword([FromBody] MiniProgramResetPasswordInput input)
    {
        var cacheKey = $"{SmsCodeCachePrefix}{input.Mobile}";
        var cachedCodeResult = _cachingProvider.Get<string>(cacheKey);
        string cachedCode = cachedCodeResult.Value;
        if (!cachedCodeResult.HasValue || cachedCode != input.VerificationCode)
        {
            throw Oops.Bah("验证码错误或已过期");
        }
        _cachingProvider.Remove(cacheKey);

        var appUser = await _appUserRepository.GetFirstAsync(x => x.Mobile == input.Mobile);
        if (appUser == null)
        {
            throw Oops.Bah("用户不存在");
        }

        var encryptedPassword = MD5Encryption.Encrypt($"{_idGenerator.Encode(appUser.Id)}{input.NewPassword}");
        appUser.Password = encryptedPassword;
        appUser.UpdatedTime = DateTime.Now;
        appUser.UpdatedUserId = appUser.Id;

        await _appUserRepository.UpdateAsync(appUser);
    }

    /// <summary>
    /// 生成自定义 Token
    /// </summary>
    private (string AccessToken, string RefreshToken) GenerateTokens(YD_Event.Core.Entities.AppUser appUser)
    {
        long uniqueId = _idGenerator.NewLong();
        long? accessTokenExpiredMinutes = appUser.MiniProgramRole == MiniProgramRole.Referee
            ? RefereeAccessTokenExpiredMinutes
            : null;
        string accessToken = JWTEncryption.Encrypt(new Dictionary<string, object>()
        {
            [AuthClaimsConst.AuthIdKey] = appUser.Id,
            [AuthClaimsConst.AccountKey] = appUser.Mobile,
            [AuthClaimsConst.UuidKey] = uniqueId,
            [AuthClaimsConst.AuthPlatformTypeKey] = AuthPlatformType.WeChatApplet
        }, accessTokenExpiredMinutes);

        string refreshToken = JWTEncryption.GenerateRefreshToken(accessToken);

        return (accessToken, refreshToken);
    }

    private static MiniProgramRole ParseRole(MiniProgramRegisterInput input)
    {
        if (!string.IsNullOrWhiteSpace(input.Role))
        {
            return input.Role.Trim().ToLowerInvariant() switch
            {
                "participant" or "athlete" or "user" => MiniProgramRole.Participant,
                "referee" or "judge" => MiniProgramRole.Referee,
                "checker" or "checkin" or "inspector" => throw Oops.Bah("检录员账号只能由后台添加并绑定赛事"),
                _ => throw Oops.Bah("不支持的注册角色")
            };
        }

        if (input.RoleType == (int)MiniProgramRole.Checker)
        {
            throw Oops.Bah("检录员账号只能由后台添加并绑定赛事");
        }

        if (input.RoleType is >= 1 and <= 2)
        {
            return (MiniProgramRole)input.RoleType.Value;
        }

        return MiniProgramRole.Participant;
    }

    /// <summary>参赛者可选择运动员或教练身份；裁判、检录员统一按普通用户处理。</summary>
    private static PersonType ParsePersonType(MiniProgramRegisterInput input, MiniProgramRole role)
    {
        if (role != MiniProgramRole.Participant) return PersonType.User;
        return input.PersonType switch
        {
            (int)PersonType.Coach => PersonType.Coach,
            (int)PersonType.Athlete => PersonType.Athlete,
            null => PersonType.Athlete,
            _ => throw Oops.Bah("参赛者身份只能选择运动员或教练")
        };
    }

    private static MiniProgramRole NormalizeRole(MiniProgramRole role)
    {
        return role is MiniProgramRole.Participant or MiniProgramRole.Referee or MiniProgramRole.Checker
            ? role
            : MiniProgramRole.Participant;
    }

    private static string ToRoleCode(MiniProgramRole role)
    {
        return NormalizeRole(role) switch
        {
            MiniProgramRole.Referee => "referee",
            MiniProgramRole.Checker => "checker",
            _ => "participant"
        };
    }
}