import { toastService } from '~/components/ui';
import { apiRequest } from '../axios-client';

// 后端返回的路由数据接口
export interface BackendRouteInfo {
  id: number;
  route_path: string;
  route_name: string;
  component: string;
  parent_id: number | null;
  route_title: string;
  icon: string | null;
  sort_order: number;
  is_hidden: boolean;
  is_cache: boolean;
  meta: string;
  children?: BackendRouteInfo[];
}

// 后端API响应接口
export interface BackendRoutesResponse {
  code: number;
  msg: string;
  data: {
    user_id: number;
    username: string;
    routes: BackendRouteInfo[];
  };
}

// 旧的路由数据接口（保留用于兼容）
export interface RouteInfo {
  id: number;
  path: string;
  name: string;
  meta: {
    title: string;
    icon: string;
    order: number;
    requiredRole?: string;
  };
  parent_id: number;
  is_menu: number;
}

// 用户路由权限接口
export interface UserRoutePermission {
  route_id: number;
  role_id: number;
  permission: string;
  route: RouteInfo;
}

// MenuItem结构接口
export interface MenuItem {
  id: string;
  title: string;
  path: string;
  icon: string;
  order: number;
  hideBreadcrumb?: boolean;
  requiredRole?: string;
  children?: MenuItem[];
}

// 静态菜单数据作为后备 (保留用于开发和紧急情况，当前不使用)
// eslint-disable-next-line @typescript-eslint/no-unused-vars
const FALLBACK_MENU_DATA: Record<string, MenuItem[]> = {
  'admin': [
    {
      id: 'home',
      title: '系统概览',
      path: '/home',
      icon: 'ri-home-line',
      order: 1
    },
    {
      id: 'chat-with-llm',
      title: 'AI对话',
      path: '/chat-with-llm',
      icon: 'ri-chat-smile-2-line',
      order: 2
    },
    {
      id: 'file-management',
      title: '文件管理',
      path: '/files',
      icon: 'ri-folder-line',
      order: 3,
      children: [
        {
          id: 'file-upload',
          title: '文件上传',
          path: '/files/upload',
          icon: 'ri-upload-cloud-line',
          order: 1
        },
        {
          id: 'documents',
          title: '文档列表',
          path: '/documents',
          icon: 'ri-file-list-3-line',
          order: 2
        }
      ]
    },
    {
      id: 'rule-management',
      title: '评查规则库',
      path: '/rules',
      icon: 'ri-book-3-line',
      order: 4,
      children: [
        {
          id: 'rule-groups',
          title: '评查点分组',
          path: '/rule-groups',
          icon: 'ri-folder-open-line',
          order: 1
        },
        {
          id: 'rules-list',
          title: '评查点列表',
          path: '/rules',
          icon: 'ri-list-check-3',
          order: 2
        },
        {
          id: 'rules-file',
          title: '评查文件列表',
          path: '/rules-files',
          icon: 'ri-list-check-2',
          order: 3
        }
      ]
    },
    {
      id: 'contract-template',
      title: '合同模板',
      path: '/contract-template',
      icon: 'ri-file-search-line',
      order: 5,
      children: [
        {
          id: 'contract-search-ai',
          title: '智能搜索',
          path: '/contract-template/search',
          icon: 'ri-search-line',
          order: 1
        },
        {
          id: 'contract-list',
          title: '合同列表',
          path: '/contract-template/list',
          icon: 'ri-folder-line',
          order: 2
        }
      ]
    },
    {
      id: 'system-settings',
      title: '系统设置',
      path: '/settings',
      icon: 'ri-settings-4-line',
      order: 6,
      requiredRole: 'developer',
      children: [
        {
          id: 'config-lists',
          title: '配置列表',
          path: '/config-lists',
          icon: 'ri-list-check-3',
          order: 1,
          requiredRole: 'developer'
        },
        {
          id: 'document-types',
          title: '文档类型',
          path: '/document-types',
          icon: 'ri-file-list-line',
          order: 2,
          requiredRole: 'developer'
        },
        {
          id: 'prompt-management',
          title: '提示词管理',
          path: '/prompts',
          icon: 'ri-chat-1-line',
          order: 3,
          requiredRole: 'developer'
        }
      ]
    },
    {
      id: 'cross-checking',
      title: '交叉评查',
      path: '/cross-checking',
      icon: 'ri-color-filter-line',
      order: 7
    }
  ],
  'common': [
    {
      id: 'home',
      title: '系统概览',
      path: '/home',
      icon: 'ri-home-line',
      order: 1
    },
    {
      id: 'file-management',
      title: '文件管理',
      path: '/files',
      icon: 'ri-folder-line',
      order: 3,
      children: [
        {
          id: 'file-upload',
          title: '文件上传',
          path: '/files/upload',
          icon: 'ri-upload-cloud-line',
          order: 1
        },
        {
          id: 'documents',
          title: '文档列表',
          path: '/documents',
          icon: 'ri-file-list-3-line',
          order: 2
        }
      ]
    },
    {
      id: 'rule-management',
      title: '评查规则库',
      path: '/rules',
      icon: 'ri-book-3-line',
      order: 4,
      children: [
        {
          id: 'rule-groups',
          title: '评查点分组',
          path: '/rule-groups',
          icon: 'ri-folder-open-line',
          order: 1
        },
        {
          id: 'rules-list',
          title: '评查点列表',
          path: '/rules',
          icon: 'ri-list-check-3',
          order: 2
        },
        {
          id: 'rules-file',
          title: '评查文件列表',
          path: '/rules-files',
          icon: 'ri-list-check-2',
          order: 3
        }
      ]
    },
    {
      id: 'contract-template',
      title: '合同模板',
      path: '/contract-template',
      icon: 'ri-file-search-line',
      order: 5,
      children: [
        {
          id: 'contract-search-ai',
          title: '智能搜索',
          path: '/contract-template/search',
          icon: 'ri-search-line',
          order: 1
        },
        {
          id: 'contract-list',
          title: '合同列表',
          path: '/contract-template/list',
          icon: 'ri-folder-line',
          order: 2
        }
      ]
    },
    {
      id: 'cross-checking',
      title: '交叉评查',
      path: '/cross-checking',
      icon: 'ri-color-filter-line',
      order: 7
    }
  ],
  'deptLeader': [
    {
      id: 'home',
      title: '系统概览',
      path: '/home',
      icon: 'ri-home-line',
      order: 1
    },
    {
      id: 'chat-with-llm',
      title: 'AI对话',
      path: '/chat-with-llm',
      icon: 'ri-chat-smile-2-line',
      order: 2
    },
    {
      id: 'file-management',
      title: '文件管理',
      path: '/files',
      icon: 'ri-folder-line',
      order: 3,
      children: [
        {
          id: 'file-upload',
          title: '文件上传',
          path: '/files/upload',
          icon: 'ri-upload-cloud-line',
          order: 1
        },
        {
          id: 'documents',
          title: '文档列表',
          path: '/documents',
          icon: 'ri-file-list-3-line',
          order: 2
        }
      ]
    },
    {
      id: 'rule-management',
      title: '评查规则库',
      path: '/rules',
      icon: 'ri-book-3-line',
      order: 4,
      children: [
        {
          id: 'rule-groups',
          title: '评查点分组',
          path: '/rule-groups',
          icon: 'ri-folder-open-line',
          order: 1
        },
        {
          id: 'rules-list',
          title: '评查点列表',
          path: '/rules',
          icon: 'ri-list-check-3',
          order: 2
        },
        {
          id: 'rules-file',
          title: '评查文件列表',
          path: '/rules-files',
          icon: 'ri-list-check-2',
          order: 3
        }
      ]
    },
    {
      id: 'contract-template',
      title: '合同模板',
      path: '/contract-template',
      icon: 'ri-file-search-line',
      order: 5,
      children: [
        {
          id: 'contract-search-ai',
          title: '智能搜索',
          path: '/contract-template/search',
          icon: 'ri-search-line',
          order: 1
        },
        {
          id: 'contract-list',
          title: '合同列表',
          path: '/contract-template/list',
          icon: 'ri-folder-line',
          order: 2
        }
      ]
    },
    {
      id: 'cross-checking',
      title: '交叉评查',
      path: '/cross-checking',
      icon: 'ri-color-filter-line',
      order: 7
    }
  ],
  'groupLeader': [
    {
      id: 'home',
      title: '系统概览',
      path: '/home',
      icon: 'ri-home-line',
      order: 1
    },
    {
      id: 'file-management',
      title: '文件管理',
      path: '/files',
      icon: 'ri-folder-line',
      order: 3,
      children: [
        {
          id: 'file-upload',
          title: '文件上传',
          path: '/files/upload',
          icon: 'ri-upload-cloud-line',
          order: 1
        },
        {
          id: 'documents',
          title: '文档列表',
          path: '/documents',
          icon: 'ri-file-list-3-line',
          order: 2
        }
      ]
    },
    {
      id: 'rule-management',
      title: '评查规则库',
      path: '/rules',
      icon: 'ri-book-3-line',
      order: 4,
      children: [
        {
          id: 'rule-groups',
          title: '评查点分组',
          path: '/rule-groups',
          icon: 'ri-folder-open-line',
          order: 1
        },
        {
          id: 'rules-list',
          title: '评查点列表',
          path: '/rules',
          icon: 'ri-list-check-3',
          order: 2
        },
        {
          id: 'rules-file',
          title: '评查文件列表',
          path: '/rules-files',
          icon: 'ri-list-check-2',
          order: 3
        }
      ]
    },
    {
      id: 'contract-template',
      title: '合同模板',
      path: '/contract-template',
      icon: 'ri-file-search-line',
      order: 5,
      children: [
        {
          id: 'contract-search-ai',
          title: '智能搜索',
          path: '/contract-template/search',
          icon: 'ri-search-line',
          order: 1
        },
        {
          id: 'contract-list',
          title: '合同列表',
          path: '/contract-template/list',
          icon: 'ri-folder-line',
          order: 2
        }
      ]
    },
    {
      id: 'cross-checking',
      title: '交叉评查',
      path: '/cross-checking',
      icon: 'ri-color-filter-line',
      order: 7
    }
  ]
};

/**
 * 根据角色获取用户可访问的路由（调用后端统一接口）
 * @param roleKey 角色标识 (如: 'admin', 'common', 'deptLeader', 'groupLeader') - 暂时不使用，后端通过JWT自动识别
 * @param jwt JWT token
 * @returns 用户可访问的路由列表
 */
export async function getUserRoutesByRole(roleKey: string, jwt?: string): Promise<{ success: boolean; data?: MenuItem[]; error?: string; shouldRedirectToHome?: boolean }> {
  try {
    console.log(`🔍 [User Routes] 获取用户路由，角色: ${roleKey}`);

    if (!jwt) {
      console.error('❌ [User Routes] JWT token 未提供');
      toastService.error("认证信息缺失，请重新登录");
      return { success: false, error: "JWT token 未提供", shouldRedirectToHome: true };
    }

    // 调用后端统一接口获取用户路由
    // 注意：Authorization 头会由 axios 拦截器自动添加（从 localStorage 读取）
    // 但为了确保使用正确的 token，这里仍然显式传递
    const response = await apiRequest<BackendRoutesResponse>(
      '/rbac/user/routes',  // endpoint (第一个参数)
      {
        method: 'GET',
        headers: {
          'Authorization': `Bearer ${jwt}`
        }
      }  // options (第二个参数)
    );

    // console.log('🔍 [User Routes] 后端返回:', response);

    // 检查响应是否成功
    if (response.error) {
      console.error('❌ [User Routes] API 请求失败:', response.error);
      toastService.error(response.error);
      return { success: false, error: response.error, shouldRedirectToHome: true };
    }

    // 检查响应数据
    if (!response.data) {
      console.error('❌ [User Routes] 后端未返回数据');
      toastService.error("获取路由数据失败");
      return { success: false, error: "后端未返回数据", shouldRedirectToHome: true };
    }

    const backendResponse = response.data;

    // 检查业务状态码（后端使用 code: 0 表示成功）
    if (backendResponse.code !== 0 && backendResponse.code !== 200) {
      console.error(`❌ [User Routes] 后端返回错误: ${backendResponse.msg}`);
      toastService.error(backendResponse.msg || "获取路由权限失败");
      return { success: false, error: backendResponse.msg || "获取路由权限失败", shouldRedirectToHome: true };
    }

    // 检查数据完整性
    if (!backendResponse.data || !Array.isArray(backendResponse.data.routes)) {
      console.error('❌ [User Routes] 后端未返回路由数据');
      toastService.error("未获取到路由权限，请联系管理员配置");
      return { success: false, error: "后端未返回路由数据", shouldRedirectToHome: true };
    }

    const routes = backendResponse.data.routes;

    if (routes.length === 0) {
      console.log(`⚠️ [User Routes] 用户没有分配任何路由权限`);
      toastService.error("您的角色没有分配任何路由权限，请联系管理员配置");
      return { success: false, error: "用户没有分配任何路由权限", shouldRedirectToHome: true };
    }

    // 将后端路由格式转换为前端 MenuItem 格式
    const menuItems = convertBackendRoutesToMenuItems(routes);

    console.log(`✅ [User Routes] 成功获取 ${menuItems.length} 个路由`);
    // console.log('📋 [User Routes] 菜单数据:', menuItems);

    return { success: true, data: menuItems };

  } catch (error) {
    console.error("❌ [User Routes] 获取用户路由时发生错误:", error);
    toastService.error("获取用户路由时发生错误，请稍后再试");
    return {
      success: false,
      error: `获取用户路由失败: ${error instanceof Error ? error.message : String(error)}`,
      shouldRedirectToHome: true
    };
  }
}

/**
 * Element UI 图标到 RemixIcon 的映射
 */
const ICON_MAPPING: Record<string, string> = {
  'el-icon-s-home': 'ri-home-line',
  'el-icon-house': 'ri-home-4-line',
  'el-icon-document': 'ri-file-text-line',
  'el-icon-edit': 'ri-edit-line',
  'el-icon-connection': 'ri-links-line',
  'el-icon-setting': 'ri-settings-4-line',
  'el-icon-user': 'ri-user-line',
  'el-icon-tickets': 'ri-ticket-line',
  'el-icon-chat-dot-round': 'ri-chat-smile-2-line',
  'el-icon-s-order': 'ri-list-check',
  'el-icon-s-grid': 'ri-grid-line',
  'el-icon-s-comment': 'ri-chat-1-line',
  'el-icon-files': 'ri-file-copy-line',
  'el-icon-folder': 'ri-folder-line',
  'el-icon-upload': 'ri-upload-cloud-line',
  'el-icon-download': 'ri-download-cloud-line',
  'el-icon-search': 'ri-search-line',
};

/**
 * 转换 Element UI 图标为 RemixIcon
 */
function convertIcon(elementIcon: string | null): string {
  if (!elementIcon) {
    return 'ri-file-line'; // 默认图标
  }
  return ICON_MAPPING[elementIcon] || 'ri-file-line';
}

/**
 * 将后端路由格式转换为前端 MenuItem 格式
 * @param backendRoutes 后端返回的路由数组
 * @returns MenuItem 数组
 */
function convertBackendRoutesToMenuItems(backendRoutes: BackendRouteInfo[]): MenuItem[] {
  return backendRoutes
    .filter(route => !route.is_hidden) // 过滤隐藏的路由
    .map(route => {
      const menuItem: MenuItem = {
        id: route.route_name || `route-${route.id}`,
        title: route.route_title,
        path: route.route_path,
        icon: convertIcon(route.icon),
        order: route.sort_order,
        hideBreadcrumb: route.is_hidden
      };

      // 递归处理子路由
      if (route.children && route.children.length > 0) {
        menuItem.children = convertBackendRoutesToMenuItems(route.children);
      }

      return menuItem;
    })
    .sort((a, b) => a.order - b.order); // 按 sort_order 排序
}

/**
 * 从路由信息构建菜单树结构（旧版本，已废弃）
 * @param routes 路由信息数组
 * @returns 菜单树结构
 * @deprecated 使用 convertBackendRoutesToMenuItems 替代
 */
function buildMenuTreeFromRoutes(routes: RouteInfo[]): MenuItem[] {
  // 转换为MenuItem格式
  const menuMap = new Map<number, MenuItem>();

  routes.forEach(route => {
    const menuItem: MenuItem = {
      id: route.name,
      title: route.meta.title,
      path: route.path,
      icon: route.meta.icon,
      order: route.meta.order || 0,
      requiredRole: route.meta.requiredRole
    };

    menuMap.set(route.id, menuItem);
  });

  // 构建父子关系
  const rootItems: MenuItem[] = [];
  const itemsWithParent: Array<{ item: MenuItem; parentId: number }> = [];

  routes.forEach(route => {
    const menuItem = menuMap.get(route.id);
    if (!menuItem) return;

    if (route.parent_id === 0) {
      rootItems.push(menuItem);
    } else {
      itemsWithParent.push({ item: menuItem, parentId: route.parent_id });
    }
  });

  // 添加子菜单
  itemsWithParent.forEach(({ item, parentId }) => {
    const parent = menuMap.get(parentId);
    if (parent) {
      if (!parent.children) {
        parent.children = [];
      }
      parent.children.push(item);
    }
  });

  // 排序
  rootItems.sort((a, b) => a.order - b.order);
  rootItems.forEach(item => {
    if (item.children) {
      item.children.sort((a, b) => a.order - b.order);
    }
  });

  return rootItems;
}

/**
 * 根据用户角色映射到权限系统的角色标识
 * @param userRole 前端用户角色 ('common' | 'admin' | 'deptLeader' | 'groupLeader')
 * @returns 数据库中的角色标识
 */
export function mapUserRoleToRoleKey(userRole: string): string {
  const roleMapping: Record<string, string> = {
    'common': 'common',
    'admin': 'admin',
    'deptLeader': 'deptLeader',
    'groupLeader': 'groupLeader',
    // 添加常见的后端角色映射
    'super_admin': 'admin',
    'system_admin': 'admin',
    'user': 'common',
    'developer': 'admin'
  };

  // 如果找不到映射，返回 userRole 本身（假设后端已经返回了正确的 role_key）
  return roleMapping[userRole] || userRole || 'common';
}