using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using StopShopping.EF;
using StopShopping.Services.Extensions;
using StopShopping.Services.Models;
using StopShopping.Services.Models.Req;
using StopShopping.Services.Models.Resp;

namespace StopShopping.Services.Implementions;

public class UserService : IUserService
{
    public UserService(
        ILogger<UserService> logger,
        StopShoppingContext dbContext,
        ICipherService cipherService,
        IAccessTokenService accessTokenService,
        IClaimsService claimsService,
        IFileService fileService,
        ISerialNoGenerator serialNoGenerator)
    {
        _logger = logger;
        _dbContext = dbContext;
        _cipherService = cipherService;
        _accessTokenService = accessTokenService;
        _claimsService = claimsService;
        _fileService = fileService;
        _serialNoGenerator = serialNoGenerator;
    }

    private readonly ILogger<UserService> _logger;
    private readonly StopShoppingContext _dbContext;
    private readonly ICipherService _cipherService;
    private readonly IAccessTokenService _accessTokenService;
    private readonly IClaimsService _claimsService;
    private readonly IFileService _fileService;
    private readonly ISerialNoGenerator _serialNoGenerator;

    public async Task<ApiResponse> SignUpAsync(SignUpParams model)
    {
        var user = await _dbContext.Users.FirstOrDefaultAsync(u => u.Account == model.Account);
        if (null != user)
            return ApiResponse.Failed("帐户名已存在");

        user = new EF.Models.User
        {
            Account = model.Account!,
            Addresses = [],
            Avatar = Consts.DEFAULT_AVATAR,
            CurrentRole = model.DefaultRole.GetValue(),
            NickName = model.NickName!,
            Password = _cipherService.EncryptUserPassword(model.Password!)
        };

        await _dbContext.AddAsync(user);
        if (await _dbContext.SaveChangesAsync() > 0)
            return ApiResponse.Succed();

        return ApiResponse.Failed("数据库操作失败");
    }

    public async Task<SignInResult<SignInUser>> SignInAsync(SignInParams model)
    {
        SignInResult<SignInUser> result = new();

        var user = await _dbContext.Users
            .FirstOrDefaultAsync(u => u.Account == model.Account);
        if (null == user || user.Password != _cipherService.EncryptUserPassword(model.Password!))
        {
            result.IsSucced = false;
            result.Message = "账号或密码错误";

            return result;
        }
        user.LastLoginTime = DateTime.Now;
        await _dbContext.SaveChangesAsync();

        var claimsIdentity = _claimsService.BuildIdentity(user);

        result.RefreshToken = await _accessTokenService.SetRefreshTokenAsync(user.Id, SystemRoles.User);

        result.User = new SignInUser
        {
            AvatarUrl = string.IsNullOrWhiteSpace(user.Avatar)
                ? null
                : _fileService.GetFileUrl(UploadScences.Avatar, user.Avatar),
            NickName = user.NickName,
            DefaultRole = user.CurrentRole.ToUserRoles(),
            AccessToken = _accessTokenService.GenerateAccessToken(claimsIdentity)
        };

        return result;
    }

    public async Task<SignInResult<SignInAdmin>> SignInAdminAsync(SignInParams model)
    {
        SignInResult<SignInAdmin> result = new();

        var admin = await _dbContext.Administrators
            .FirstOrDefaultAsync(u => u.Account == model.Account);
        if (null == admin || admin.Password != _cipherService.EncryptUserPassword(model.Password!))
        {
            result.IsSucced = false;
            result.Message = "账号或密码错误";

            return result;
        }
        admin.LastLoginTime = DateTime.Now;
        await _dbContext.SaveChangesAsync();

        var claimsIdentity = _claimsService.BuildAdminIdentity(admin);

        result.RefreshToken = await _accessTokenService.SetRefreshTokenAsync(admin.Id, SystemRoles.Admin);

        result.User = new SignInAdmin
        {
            NickName = admin.NickName,
            AccessToken = _accessTokenService.GenerateAccessToken(claimsIdentity)
        };

        return result;
    }

    public async Task GenerateDefaultAdminAsync()
    {
        var defaultAdmin = await _dbContext.Administrators
            .Where(a => a.Account == Consts.DEFAULT_ADMIN_ACCOUNT)
            .FirstOrDefaultAsync();
        if (null != defaultAdmin)
        {
            _logger.LogInformation("默认管理员已存在，已跳过");
            return;
        }

        var pwd = _serialNoGenerator.GenerateRandomPassword();
        defaultAdmin = new()
        {
            Account = Consts.DEFAULT_ADMIN_ACCOUNT,
            NickName = "超级管理员",
            Password = _cipherService.EncryptUserPassword(pwd)
        };
        await _dbContext.Administrators.AddAsync(defaultAdmin);
        await _dbContext.SaveChangesAsync();

        _logger.LogInformation(
            "默认管理员({Account})已生成，请立马修改密码:{Password}",
            Consts.DEFAULT_ADMIN_ACCOUNT,
            pwd);
    }

    public async Task<ApiResponse> ChangePasswordAsync(ChangePasswordParams model)
    {
        int userId = _claimsService.GetCurrentUserId();
        var user = await _dbContext.Users
            .FirstAsync(u => u.Id == userId);

        if (_cipherService.EncryptUserPassword(model.OldPassword!) != user.Password)
            return ApiResponse.Failed("原密码错误");

        user.Password = _cipherService.EncryptUserPassword(model.NewPassword!);

        await _dbContext.SaveChangesAsync();

        return ApiResponse.Succed();
    }

    public async Task<ApiResponse<User>> GetUserInfoAsync()
    {
        var userId = _claimsService.GetCurrentUserId();
        var model = await _dbContext.Users
            .FirstAsync(u => u.Id == userId);

        User user = new()
        {
            Account = model.Account,
            AvatarUrl = string.IsNullOrWhiteSpace(model.Avatar)
                ? null
                : _fileService.GetFileUrl(UploadScences.Avatar, model.Avatar),
            DefaultRole = model.CurrentRole.ToUserRoles(),
            LastLoginTime = model.LastLoginTime?.ToFormatted(),
            NickName = model.NickName,
            Telephone = model.Telephone
        };

        return new ApiResponse<User>(user);
    }

    public async Task<ApiResponse> EditAsync(EditUserParams model)
    {
        int userId = _claimsService.GetCurrentUserId();
        var user = await _dbContext.Users.FirstAsync(u => u.Id == userId);

        if (!string.IsNullOrWhiteSpace(model.AvatarFileName))
            user.Avatar = model.AvatarFileName;
        user.CurrentRole = model.DefaultRole.GetValue();
        if (!string.IsNullOrWhiteSpace(model.NickName))
            user.NickName = model.NickName;
        if (!string.IsNullOrWhiteSpace(model.Telephone))
            user.Telephone = model.Telephone;

        await _dbContext.SaveChangesAsync();

        return ApiResponse.Succed();
    }

    public ApiResponse<List<Address>> GetAddresses()
    {
        var userId = _claimsService.GetCurrentUserId();

        var addresses = _dbContext.Addresses
            .Where(a => a.UserId == userId)
            .OrderByDescending(a => a.Default)
            .AsNoTracking()
            .Select(Cast)
            .ToList();

        return new ApiResponse<List<Address>>(addresses);
    }

    public async Task<ApiResponse> EditAddressAsync(EditAddressParams model)
    {
        EF.Models.Address? address = null;

        var userId = _claimsService.GetCurrentUserId();

        if (model.Id.HasValue && model.Id > 0)
        {
            address = await _dbContext.Addresses
                .FirstOrDefaultAsync(a => a.Id == model.Id && a.UserId == userId);
            if (null == address)
                return ApiResponse.Failed("地址已不存在");
        }
        else
        {
            address = new();
            await _dbContext.Addresses.AddAsync(address);
        }

        address.Default = model.Default;
        address.Detail = model.Detail;
        address.DistrictLevel1Id = model.DistrictLevel1Id;
        address.DistrictLevel2Id = model.DistrictLevel2Id;
        address.DistrictLevel3Id = model.DistrictLevel3Id;
        address.DistrictLevel4Id = model.DistrictLevel4Id;
        address.Name = model.Name;
        address.Tag = model.Tag;
        address.Telephone = model.Telephone;

        await _dbContext.SaveChangesAsync();

        return ApiResponse.Succed();
    }

    public async Task<ApiResponse> DeleteAddressAsync(int id)
    {
        var userId = _claimsService.GetCurrentUserId();
        await _dbContext.Addresses
            .Where(a => a.Id == id && a.UserId == userId)
            .ExecuteDeleteAsync();

        return ApiResponse.Succed();
    }

    #region private methods

    private Address Cast(EF.Models.Address a)
    {
        return new Address
        {
            Default = a.Default,
            Detail = a.Detail,
            DistrictLevel1Id = a.DistrictLevel1Id,
            DistrictLevel2Id = a.DistrictLevel2Id,
            DistrictLevel3Id = a.DistrictLevel3Id,
            DistrictLevel4Id = a.DistrictLevel4Id,
            Id = a.Id,
            Name = a.Name,
            Tag = a.Tag,
            Telephone = a.Telephone
        };
    }

    #endregion
}