using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using System.Security.Claims;
using RainOpsMini.Helpers;
using RainOpsMini.Models;
using RainOpsMini;

namespace RainOpsMini.Apis
{
    public static class AuthApi
    {
        public static void MapAuthApis(this IEndpointRouteBuilder app)
        {
            // API: 获取验证码
            // 生成图形验证码用于登录验证
            app.MapGet("/api/captcha", (IMemoryCache cache) =>
            {
                var (code, svg) = CaptchaHelper.GenerateCaptcha();
                var id = Guid.NewGuid().ToString();

                // 缓存验证码，有效期 5 分钟
                cache.Set(id, code, TimeSpan.FromMinutes(5));

                return Results.Ok(new { id, svg });
            });

            // API: 用户登录
            // 验证用户名密码和验证码，发放 Cookie
            app.MapPost("/api/login", async (LoginRequest req, HttpContext ctx, IMemoryCache cache) =>
            {
                // 校验验证码
                if (string.IsNullOrEmpty(req.CaptchaId) || string.IsNullOrEmpty(req.CaptchaCode))
                {
                    return Results.BadRequest(new { error = "请输入验证码" });
                }

                if (!cache.TryGetValue(req.CaptchaId, out string? correctCode) || correctCode == null)
                {
                    return Results.BadRequest(new { error = "验证码已过期，请刷新" });
                }

                if (!string.Equals(correctCode, req.CaptchaCode, StringComparison.OrdinalIgnoreCase))
                {
                    return Results.BadRequest(new { error = "验证码错误" });
                }

                // 移除已使用的验证码
                cache.Remove(req.CaptchaId);

                // 1. 检查超级管理员账号 (配置文件中定义)
                // 使用 Program.config 访问全局配置
                if (req.Username == Program.Config.WebUser && req.Password == Program.Config.WebPassword)
                {
                    var claims = new List<Claim>
                    {
                        new Claim(ClaimTypes.Name, req.Username),
                        new Claim("IsSuperAdmin", "true"),
                        new Claim("Permission", "all")
                    };

                    var claimsIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
                    var authProperties = new AuthenticationProperties
                    {
                        IsPersistent = true
                    };

                    // 记录登录日志
                    try
                    {
                        using (var db = DbHelper.GetInstance())
                        {
                            db.Insertable(new RainOpsMini.Models.UserLoginLog
                            {
                                Username = req.Username,
                                LoginTime = DateTime.Now,
                                IpAddress = ctx.Connection.RemoteIpAddress?.ToString()
                            }).ExecuteCommand();
                        }
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine($"Failed to record login: {ex.Message}");
                    }

                    await ctx.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(claimsIdentity), authProperties);
                    return Results.Ok(new { redirect = "/", permissions = new List<string> { "all" } });
                }

                // 2. 检查子账号 (数据库中定义)
                var user = UserStorage.GetByUsername(req.Username);
                if (user != null && user.IsEnabled && user.Password == req.Password)
                {
                    var claims = new List<Claim>
                    {
                        new Claim(ClaimTypes.Name, req.Username),
                        new Claim("IsSuperAdmin", "false")
                    };

                    // 合并用户权限和角色权限
                    var effectivePermissions = new HashSet<string>(user.Permissions);
                    if (!string.IsNullOrEmpty(user.RoleId))
                    {
                        var role = RoleStorage.GetById(user.RoleId);
                        if (role != null)
                        {
                            foreach (var p in role.Permissions)
                            {
                                effectivePermissions.Add(p);
                            }
                        }
                    }

                    foreach (var perm in effectivePermissions)
                    {
                        claims.Add(new Claim("Permission", perm));
                    }

                    var claimsIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
                    var authProperties = new AuthenticationProperties
                    {
                        IsPersistent = true
                    };

                    // 记录登录日志
                    try
                    {
                        using (var db = DbHelper.GetInstance())
                        {
                            db.Insertable(new RainOpsMini.Models.UserLoginLog
                            {
                                Username = req.Username,
                                LoginTime = DateTime.Now,
                                IpAddress = ctx.Connection.RemoteIpAddress?.ToString()
                            }).ExecuteCommand();
                        }
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine($"Failed to record login: {ex.Message}");
                    }

                    await ctx.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(claimsIdentity), authProperties);
                    return Results.Ok(new { redirect = "/", permissions = effectivePermissions.ToList() });
                }

                return Results.Unauthorized();
            });

            // API: 获取当前用户信息
            // 返回当前登录用户的权限和角色信息
            app.MapGet("/api/auth/me", (HttpContext ctx) =>
            {
                if (ctx.User.Identity?.IsAuthenticated != true) return Results.Unauthorized();

                var isSuper = ctx.User.FindFirst("IsSuperAdmin")?.Value == "true";
                var username = ctx.User.Identity.Name;
                var perms = new List<string>();

                // 重新获取最新权限 (避免 Cookie 中权限过期)
                if (!isSuper && !string.IsNullOrEmpty(username))
                {
                    var user = UserStorage.GetByUsername(username);
                    if (user != null)
                    {
                        var effectivePermissions = new HashSet<string>(user.Permissions);
                        if (!string.IsNullOrEmpty(user.RoleId))
                        {
                            var role = RoleStorage.GetById(user.RoleId);
                            if (role != null)
                            {
                                foreach (var p in role.Permissions)
                                {
                                    effectivePermissions.Add(p);
                                }
                            }
                        }
                        perms = effectivePermissions.ToList();
                    }
                }
                else if (isSuper)
                {
                    perms.Add("all");
                }

                return Results.Json(new
                {
                    username,
                    isSuperAdmin = isSuper,
                    permissions = perms
                });
            });
            
            // API: 退出登录
            app.MapPost("/api/logout", async (HttpContext ctx) =>
            {
                await ctx.SignOutAsync(CookieAuthenticationDefaults.AuthenticationScheme);
                return Results.Ok();
            });
        }
    }
}