import type { PageId, PageParams, PageRoute } from "../contracts/page";
import type { CurrentUserView } from "../contracts/workspace";
import { isPlatformAdmin } from "../contracts/workspace";

export const firstPartyRoutes: PageRoute[] = [
  {
    id: "profileSettings",
    label: "个人设置",
    path: "/profile",
    hash: "#/profile",
    description: "个人资料与界面偏好",
    requiredCapability: "profile.settings.manage",
    showInNav: false
  },
  {
    id: "home",
    label: "平台概览",
    path: "/",
    hash: "#/home",
    description: "平台运行健康概览",
    requiredCapability: "platform.overview.read",
    showInNav: true
  },
  {
    id: "servers",
    label: "服务器管理",
    path: "/servers",
    hash: "#/servers",
    description: "服务器列表、状态与生命周期",
    requiredCapability: "servers.read",
    showInNav: true
  },
  {
    id: "serverDetail",
    label: "服务器详情",
    path: "/servers/:serverId",
    hash: "#/servers/:serverId",
    description: "单服务器日常运维工作台",
    requiredCapability: "servers.read",
    showInNav: false
  },
  {
    id: "pluginPage",
    label: "插件页面",
    path: "/plugin-pages/:pluginId/:routeKey",
    hash: "#/plugin-pages/:pluginId/:routeKey",
    description: "平台托管的插件运维页面",
    requiredCapability: "servers.read",
    showInNav: false
  },
  {
    id: "plugins",
    label: "插件市场",
    path: "/plugins",
    hash: "#/plugins",
    description: "插件发现、安装状态与文档",
    requiredCapability: "plugins.market.read",
    showInNav: true
  },
  {
    id: "users",
    label: "用户管理",
    path: "/users",
    hash: "#/users",
    description: "用户、角色和访问审核",
    requiredCapability: "users.manage",
    showInNav: true
  },
  {
    id: "aiProviders",
    label: "AI 提供商管理",
    path: "/ai-providers",
    hash: "#/aiProviders",
    description: "平台中介模型配置",
    requiredCapability: "aiProviders.manage",
    showInNav: true
  },
  {
    id: "maintenance",
    label: "系统维护",
    path: "/maintenance",
    hash: "#/maintenance",
    description: "审计事件与运行节点健康",
    requiredCapability: "system.maintenance",
    showInNav: true
  }
];

const routesById = new Map(firstPartyRoutes.map((route) => [route.id, route]));

export interface ResolvedRoute {
  route: PageRoute;
  params: PageParams;
}

export function routeForPage(pageId: PageId): PageRoute {
  return routesById.get(pageId) ?? firstPartyRoutes[0];
}

export function hashForPage(pageId: PageId, params: PageParams = {}): string {
  const route = routeForPage(pageId);
  if (pageId === "serverDetail" && params.serverId) {
    return `#/servers/${encodeURIComponent(params.serverId)}`;
  }
  if (pageId === "pluginPage" && params.pluginId && params.routeKey) {
    const query = new URLSearchParams();
    if (params.serverId) {
      query.set("serverInstanceId", params.serverId);
    }
    const suffix = query.toString();
    return `#/plugin-pages/${encodeURIComponent(params.pluginId)}/${encodeURIComponent(params.routeKey)}${suffix ? `?${suffix}` : ""}`;
  }
  return route.hash;
}

export function defaultPageForUser(user: CurrentUserView): PageId {
  return isPlatformAdmin(user) ? "home" : "servers";
}

export function navigationRoutesForUser(user: CurrentUserView): PageRoute[] {
  return firstPartyRoutes.filter((route) => route.showInNav && user.capabilities.includes(route.requiredCapability));
}

export function canAccessRoute(user: CurrentUserView, pageId: PageId): boolean {
  const route = routesById.get(pageId);
  if (!route) {
    return false;
  }
  return user.capabilities.includes(route.requiredCapability);
}

export function resolveRouteHash(hash: string, user?: CurrentUserView): ResolvedRoute {
  const fallback: ResolvedRoute = {
    route: routeForPage(user ? defaultPageForUser(user) : "servers"),
    params: {}
  };
  const normalized = hash.replace(/^#/, "");
  if (!normalized || normalized === "/") {
    return fallback;
  }
  const [normalizedPath, rawQuery = ""] = normalized.split("?", 2);
  const segments = normalizedPath.replace(/^\//, "").split("/").filter(Boolean);
  if (segments.length === 0) {
    return fallback;
  }
  if (segments[0] === "servers" && segments.length > 1) {
    return { route: routeForPage("serverDetail"), params: { serverId: decodeURIComponent(segments[1]) } };
  }
  if (segments[0] === "plugin-pages" && segments.length > 2) {
    const serverId = new URLSearchParams(rawQuery).get("serverInstanceId") ?? undefined;
    return {
      route: routeForPage("pluginPage"),
      params: {
        pluginId: decodeURIComponent(segments[1]),
        routeKey: decodeURIComponent(segments[2]),
        serverId
      }
    };
  }
  const key = segments[0];
  const byId = routesById.get(key as PageId);
  if (byId) {
    return { route: byId, params: {} };
  }
  const byPath = firstPartyRoutes.find((route) => route.path === `/${key}`);
  if (byPath) {
    return { route: byPath, params: {} };
  }
  return fallback;
}