/**
 * `/database/*` route aggregator.
 *
 * Owns the `/database` HTTP surface (single place new sub-routes get wired in).
 * Handlers use ABSOLUTE paths (no Fastify prefix) so every route greps as the
 * literal string it serves.
 *
 * 标准前后端分离:本文件**不渲染任何 HTML**。登录页与管理后台六个 tab 全部由
 * `hub/filelib-web` 这一个 SvelteKit SPA 提供(同一份产物挂 /app 与 /database,
 * 见 ../static.ts / registerDatabaseSpa)。此处只留 SPA 依赖的 JSON/跳转端点:
 *
 *   /database/config     — unauthenticated bootstrap: silo org slug + dev toggle
 *   /database/api/stats  — 概览页统计(需登录 + silo org OWNER/ADMIN)
 *   /database/dev-login  — DEV ONLY bypass, registered only when the flag is on
 *
 * The dev bypass (/database/dev-login) is self-contained here and gated by
 * allowDevLoginBypass (computed in ./plugin.ts from HUB_DEV_LOGIN_BYPASS +
 * NODE_ENV). Production requires real Feishu OAuth.
 *
 * NOTE: concrete routes here MUST be registered before the SPA fallback
 * (registerDatabaseSpa serves /database and /database/*), or the wildcard would
 * shadow them.
 */
import type { FastifyInstance } from "fastify";
import type { PrismaClient } from "@prisma/client";
import path from "node:path";
import { SESSION_COOKIE_NAME, signSession } from "../../admin/auth/session.js";
import { registerFileLibRoutes } from "./filelibRoutes.js";
import { registerFileRoutes } from "./fileRoutes.js";
import { registerMemberGroupRoutes } from "./memberGroupRoutes.js";
import { registerTeacherApp } from "./teacherApp.js";
import { createInMemoryVersionStore } from "../filelib/versionStore.js";
import { createMemberGroupResolver } from "../filelib/memberGroupResolver.js";
import { createHttpGroupResolver } from "../filelib/groupResolverHttp.js";
import { createManifestStubAdapter } from "../filelib/exportService.js";
import { FILE_LIB_AUDIT_ACTIONS } from "../filelib/audit.js";
import { actorOrNull, sendRouteError } from "../filelib/routeShared.js";
import type { FileLibRouteDeps } from "../filelib/routeShared.js";

export interface DatabaseRouteConfig {
  readonly prisma: PrismaClient;
  /** HMAC secret for the signed session cookie — reused from the admin plane. */
  readonly sessionSecret: string;
  /** Silo Organization slug — the SPA builds the org-scoped Feishu login link from it. */
  readonly siloOrganizationSlug: string;
  /** DEV ONLY. Enables the one-click button and the /database/dev-login route. */
  readonly allowDevLoginBypass: boolean;
}

export async function registerDatabaseRoutes(
  app: FastifyInstance,
  config: DatabaseRouteConfig,
): Promise<void> {
  // 文件库依赖在下方装配;概览页统计在请求时经此引用读取(请求一定晚于装配完成)。
  let filelibDepsForStats: FileLibRouteDeps | null = null;

  // 登录页/前端 bootstrap(公开;org slug 本就在 OAuth URL 中,不构成敏感信息)。
  // 与老师端 /database/api/login-info 同形状 —— 后者由 teacherApp.ts 注册,
  // 两处并存是为了兼容既有前端调用点。
  app.get("/database/config", async () => ({
    orgSlug: config.siloOrganizationSlug,
    devLoginEnabled: config.allowDevLoginBypass,
  }));

  // 概览页统计。登录 + silo org OWNER/ADMIN 才给 —— 它聚合的是全 org 口径的
  // 计数与审计流,不是某个节点的授权视图,所以不走 per-node 的 role 判定。
  app.get("/database/api/stats", async (request, reply) => {
    if (filelibDepsForStats === null) {
      return reply.status(503).send({ error: { code: "unavailable", message: "filelib not ready" } });
    }
    const actor = await actorOrNull(request, reply, filelibDepsForStats);
    if (actor === null) return reply;
    if (!actor.isWebsiteAdmin) {
      return reply.status(403).send({ error: { code: "forbidden", message: "requires organization OWNER/ADMIN" } });
    }
    try {
      return await loadDashboardStats(config.prisma, filelibDepsForStats);
    } catch (error) {
      return sendRouteError(reply, error);
    }
  });

  // DEV ONLY bypass — self-contained here, registered only when the flag is on
  // (see ./plugin.ts). Mints a session for an existing OWNER/ADMIN, reusing the
  // scoped SessionIdentity shape the Feishu OAuth callback produces so the
  // session guard behaves identically. Never registered in production.
  if (config.allowDevLoginBypass) {
    app.get("/database/dev-login", async (_request, reply) => {
      const membership = await config.prisma.organizationMembership.findFirst({
        where: {
          revokedAt: null,
          role: { in: ["OWNER", "ADMIN"] },
          organization: { status: "ACTIVE" },
        },
        select: { userId: true, organizationId: true },
        orderBy: { createdAt: "asc" },
      });
      if (membership === null) {
        return reply.status(404).send({ error: { code: "no_admin", message: "no active OWNER/ADMIN to impersonate" } });
      }
      const identity = await config.prisma.feishuUserIdentity.findFirst({
        where: {
          userId: membership.userId,
          connection: { organizationId: membership.organizationId, status: "ACTIVE" },
        },
        select: { id: true, connectionId: true, connection: { select: { organizationId: true } } },
      });
      if (identity === null) {
        return reply.status(404).send({ error: { code: "no_identity", message: "admin has no active scoped Feishu identity" } });
      }
      const token = signSession(
        {
          userId: membership.userId,
          feishuIdentityId: identity.id,
          feishuConnectionId: identity.connectionId,
          feishuOrganizationId: identity.connection.organizationId,
        },
        config.sessionSecret,
      );
      // Local dev is http://127.0.0.1, so secure:false. This route only ever
      // runs outside production (double-gated in ./plugin.ts).
      reply.setCookie(SESSION_COOKIE_NAME, token, {
        path: "/",
        httpOnly: true,
        sameSite: "lax",
        secure: false,
        maxAge: 7 * 24 * 60 * 60,
      });
      reply.log.warn({ userId: membership.userId, orgId: membership.organizationId }, "DEV database login bypass used");
      return reply.redirect("/database/dashboard");
    });
  }

  // 文件库(独立模块,《文件库-接口契约.md》):API + 老师端 /app 静态托管。
  // 依赖装配:VersionStore 当前为内存+快照实现(版本团队 npm 包到位后替换);
  // GroupResolver 默认读 in-hub MemberGroup 闭包(ADR-0028),
  // HUB_GROUP_SERVICE_URL 配置后切 HTTP(C2);
  // 导出适配器当前为 manifest stub(OPEN-6,真导出工具到位后替换)。
  const siloOrg = await config.prisma.organization.findUnique({
    where: { slug: config.siloOrganizationSlug },
    select: { id: true },
  });
  if (siloOrg === null) {
    app.log.warn({ slug: config.siloOrganizationSlug }, "filelib: silo organization not found, routes not registered");
    return;
  }
  const storageRoot = process.env["HUB_FILELIB_STORAGE_ROOT"] ?? path.resolve(".filelib-repos");
  const versionStore = createInMemoryVersionStore(path.join(storageRoot, ".version-store.json"));
  const groupServiceUrl = process.env["HUB_GROUP_SERVICE_URL"];
  const filelibDeps: FileLibRouteDeps = {
    prisma: config.prisma,
    sessionSecret: config.sessionSecret,
    organizationId: siloOrg.id,
    storageRoot,
    groupResolver: groupServiceUrl === undefined || groupServiceUrl.trim() === ""
      ? createMemberGroupResolver(config.prisma)
      : createHttpGroupResolver({ baseUrl: groupServiceUrl }),
    versionStore,
    exportAdapters: [createManifestStubAdapter(versionStore)],
  };
  await registerFileLibRoutes(app, filelibDeps);
  await registerFileRoutes(app, filelibDeps);
  await registerMemberGroupRoutes(app, filelibDeps);
  await registerTeacherApp(app, {
    prisma: config.prisma,
    sessionSecret: config.sessionSecret,
    siloOrganizationSlug: config.siloOrganizationSlug,
    allowDevLoginBypass: config.allowDevLoginBypass,
  });

  // 独立文件库页已并入后台「文件库」tab;旧地址跳转保留兼容。
  // SPA 化后目标是真路由(不再是 #library 锚点)。
  app.get("/database/library", async (_request, reply) =>
    reply.redirect("/database/dashboard/library"),
  );

  filelibDepsForStats = filelibDeps;
}

/* ------------------------------------------------------------ 概览页统计 */

interface DashboardStats {
  readonly folders: number;
  readonly projects: number;
  readonly files: number;
  readonly grants: number;
  readonly recent: ReadonlyArray<{
    readonly action: string;
    readonly actor: string;
    readonly label: string;
    readonly when: Date;
  }>;
}

/** 概览页统计:org 范围内的文件夹/项目/授权(DB)+ 文件(版本库)+ 最近活动(AuditEntry)。 */
async function loadDashboardStats(
  prisma: PrismaClient,
  deps: FileLibRouteDeps,
): Promise<DashboardStats> {
  const organizationId = deps.organizationId;
  const [folders, projects, grants] = await Promise.all([
    prisma.fileLibNode.count({ where: { organizationId, kind: "FOLDER", deletedAt: null } }),
    prisma.fileLibNode.count({ where: { organizationId, kind: "PROJECT", deletedAt: null } }),
    prisma.fileLibGrant.count({ where: { organizationId, revokedAt: null } }),
  ]);
  // 文件计数:遍历 READY 项目问版本库(demo 规模;真版本包到位后应换成存储侧统计)
  const readyProjects = await prisma.fileLibNode.findMany({
    where: {
      organizationId, kind: "PROJECT", deletedAt: null,
      provisionStatus: "READY", storageDir: { not: null },
    },
    select: { storageDir: true },
  });
  let files = 0;
  for (const project of readyProjects) {
    if (project.storageDir === null) continue;
    try {
      files += (await deps.versionStore.list(project.storageDir)).length;
    } catch { /* repo 缺失(如重启未恢复)不计 */ }
  }
  const entries = await prisma.auditEntry.findMany({
    where: { organizationId, action: { in: Object.values(FILE_LIB_AUDIT_ACTIONS) } },
    orderBy: { createdAt: "desc" },
    take: 8,
  });
  const actorIds = [...new Set(entries.map((e) => e.actorUserId).filter((x): x is string => x !== null))];
  const users = actorIds.length === 0
    ? []
    : await prisma.user.findMany({ where: { id: { in: actorIds } }, select: { id: true, displayName: true } });
  const nameById = new Map(users.map((u) => [u.id, u.displayName]));
  const recent = entries.map((entry) => {
    const meta = (entry.metadata ?? {}) as Record<string, unknown>;
    const label =
      (typeof meta["name"] === "string" ? meta["name"] : undefined) ??
      (typeof meta["to"] === "string" ? meta["to"] : undefined) ??
      (typeof meta["path"] === "string" ? meta["path"] : undefined) ??
      (typeof meta["objectId"] === "string" ? meta["objectId"].slice(0, 8) : "");
    return {
      action: entry.action,
      actor: nameById.get(entry.actorUserId ?? "") ?? entry.actorUserId ?? "unknown",
      label,
      when: entry.createdAt,
    };
  });
  return { folders, projects, files, grants, recent };
}