using CampusErrand.Data;
using CampusErrand.Models;
using CampusErrand.Models.Dtos;
using CampusErrand.Services;
using CampusErrand.Helpers;
using Microsoft.EntityFrameworkCore;

namespace CampusErrand.Endpoints;

public static class AuthEndpoints
{
    public static void MapAuthEndpoints(this WebApplication app)
    {
        // 微信手机号登录接口
        app.MapPost("/api/auth/login", async (
            WeChatLoginRequest request,
            IWeChatService weChatService,
            JwtService jwtService,
            AppDbContext db) =>
        {
            // 1. 调用微信 code2Session 获取 session_key 和 openid
            var sessionResult = await weChatService.Code2SessionAsync(request.Code);
            if (!sessionResult.Success)
            {
                return Results.BadRequest(new { code = 400, message = sessionResult.ErrorMessage });
            }

            // 2. 使用 session_key 解密手机号
            string phoneNumber;
            try
            {
                phoneNumber = weChatService.DecryptPhoneNumber(
                    sessionResult.SessionKey!, request.EncryptedData, request.Iv);
            }
            catch (Exception)
            {
                return Results.BadRequest(new { code = 400, message = "手机号解密失败" });
            }

            // 3. 根据手机号查找或创建用户
            var user = await db.Users.FirstOrDefaultAsync(u => u.Phone == phoneNumber);
            if (user == null)
            {
                user = new User
                {
                    Uid = await BusinessHelpers.GenerateUniqueUid(db),
                    OpenId = sessionResult.OpenId!,
                    Phone = phoneNumber,
                    Nickname = $"用户{phoneNumber[^4..]}",
                    CreatedAt = DateTime.UtcNow
                };
                db.Users.Add(user);
                await db.SaveChangesAsync();
            }
            else if (string.IsNullOrEmpty(user.OpenId) && !string.IsNullOrEmpty(sessionResult.OpenId))
            {
                // 更新 OpenId（如果之前为空）
                user.OpenId = sessionResult.OpenId;
                await db.SaveChangesAsync();
            }

            // 4. 生成 JWT 返回
            var token = jwtService.GenerateToken(user.Id, user.Role.ToString());

            return Results.Ok(new LoginResponse
            {
                Token = token,
                UserInfo = new UserInfo
                {
                    Id = user.Id,
                    Uid = user.Uid,
                    Phone = user.Phone,
                    Nickname = user.Nickname,
                    AvatarUrl = user.AvatarUrl,
                    Role = user.Role.ToString()
                }
            });
        });

        // 微信快捷登录（仅需 code，通过 openid 注册/登录）
        app.MapPost("/api/auth/wx-login", async (
            WxLoginRequest request,
            IWeChatService weChatService,
            JwtService jwtService,
            AppDbContext db) =>
        {
            // 1. 调用微信 code2Session 获取 openid
            Console.WriteLine($"[wx-login] 收到 code: {request.Code}");
            var sessionResult = await weChatService.Code2SessionAsync(request.Code);
            if (!sessionResult.Success)
            {
                return Results.BadRequest(new { code = 400, message = sessionResult.ErrorMessage });
            }

            // 2. 根据 openid 查找或创建用户
            var openId = sessionResult.OpenId!;
            var user = await db.Users.FirstOrDefaultAsync(u => u.OpenId == openId);
            if (user == null)
            {
                // 自动注册，手机号暂时留空
                var randomSuffix = Random.Shared.Next(1000, 9999).ToString();
                user = new User
                {
                    Uid = await BusinessHelpers.GenerateUniqueUid(db),
                    OpenId = openId,
                    Phone = "",
                    Nickname = $"微信用户{randomSuffix}",
                    CreatedAt = DateTime.UtcNow
                };
                db.Users.Add(user);
                await db.SaveChangesAsync();
            }

            // 3. 生成 JWT 返回
            var token = jwtService.GenerateToken(user.Id, user.Role.ToString());

            return Results.Ok(new LoginResponse
            {
                Token = token,
                UserInfo = new UserInfo
                {
                    Id = user.Id,
                    Uid = user.Uid,
                    Phone = user.Phone,
                    Nickname = user.Nickname,
                    AvatarUrl = user.AvatarUrl,
                    Role = user.Role.ToString()
                }
            });
        });

        // 受保护的测试端点（用于验证认证和授权）
        app.MapGet("/api/protected", () => Results.Ok("ok"))
            .RequireAuthorization();

        // 更新用户信息（昵称、头像）
        app.MapPut("/api/user/profile", async (UpdateProfileRequest request, HttpContext httpContext, AppDbContext db) =>
        {
            var userIdClaim = httpContext.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier);
            if (userIdClaim == null) return Results.Unauthorized();
            var userId = int.Parse(userIdClaim.Value);

            var user = await db.Users.FindAsync(userId);
            if (user == null) return Results.NotFound(new { code = 404, message = "用户不存在" });

            if (!string.IsNullOrWhiteSpace(request.Nickname))
                user.Nickname = request.Nickname.Trim();
            if (!string.IsNullOrWhiteSpace(request.AvatarUrl))
                user.AvatarUrl = request.AvatarUrl.Trim();

            await db.SaveChangesAsync();

            return Results.Ok(new UserInfo
            {
                Id = user.Id,
                Uid = user.Uid,
                Phone = user.Phone,
                Nickname = user.Nickname,
                AvatarUrl = user.AvatarUrl,
                Role = user.Role.ToString()
            });
        }).RequireAuthorization();

        // 管理员账号密码登录接口
        app.MapPost("/api/admin/auth/login", async (
            AdminLoginRequest request,
            JwtService jwtService,
            AppDbContext db,
            IConfiguration configuration) =>
        {
            // 从配置读取管理员凭据
            var adminUsername = configuration["Admin:Username"] ?? "admin";
            var adminPassword = configuration["Admin:Password"] ?? "admin123";

            if (request.Username != adminUsername || request.Password != adminPassword)
            {
                return Results.BadRequest(new { code = 400, message = "账号或密码错误" });
            }

            // 查找或创建管理员用户
            var admin = await db.Users.FirstOrDefaultAsync(u => u.Role == UserRole.Admin);
            if (admin == null)
            {
                admin = new User
                {
                    OpenId = "admin",
                    Phone = "admin",
                    Nickname = "管理员",
                    Role = UserRole.Admin,
                    CreatedAt = DateTime.UtcNow
                };
                db.Users.Add(admin);
                await db.SaveChangesAsync();
            }

            var token = jwtService.GenerateToken(admin.Id, admin.Role.ToString());

            return Results.Ok(new { token });
        });
    }
}