import { randomUUID } from "node:crypto";
import type { TmdbClient } from "@umt/adapters";
import { FilesIdentifyRequest } from "@umt/contracts";
import { defineTask } from "@umt/tasks";
import { z } from "zod";
import type { AoOverrides } from "../acquisition-organize/index.ts";
import { createPorts } from "../acquisition-organize/ports.ts";
import { registerScheduledJob } from "../schedules/registry.ts";
import { SourcesRuntime } from "../sources-identity/runtime.ts";
import type { ServerContext, ServerModule } from "../types.ts";
import { defaultOptions, type FmDeps, type FmOptions } from "./common.ts";
import { IDENTIFY_REMOTE_TASK, runIdentifyRemote } from "./identify.ts";
import { registerOrganizeSourceRoutes } from "./routes/organize-sources.ts";
import { registerFileRoutes } from "./routes.ts";
import { queueDueSourceScans, scanOrganizeSource } from "./source-monitor.ts";
import { purgeTrash } from "./trash.ts";

/**
 * W5-A 文件管理(/files,docs/plan/06-file-manager-spec.md):只浏览已登记根(库根 + 下载器路径映射),
 * 行内业务状态、改名同步资产与路径绑定修订、移动/复制两段式 planId、整理走 planImport、回收站 + 引用检查、识别/探测/刮削。
 * 复用 acquisition-organize 的服务导出(planImport / 路径守卫 / Move 授权 / H&R),不改其文件。
 * 持久任务 purgeTrash:每日清理过期回收站项(FILES_TRASH_RETENTION_DAYS,默认 7 天);周期登记为定时任务 trash.purge。
 */
export interface FmOverrides {
  ao?: AoOverrides;
  options?: Partial<FmOptions>;
  /** W9-H:TMDB 客户端工厂(测试注入);缺省按设置 metadata.tmdb* 取(与 sources-identity 同一实现) */
  tmdb?: (() => TmdbClient | null) | undefined;
}

export function createFileManagerModule(overrides: FmOverrides = {}): ServerModule & { deps(): FmDeps } {
  let deps: FmDeps | null = null;
  let sources: SourcesRuntime | null = null;
  const lazy = (ctx: ServerContext): FmDeps => {
    if (!deps) {
      const { options: aoOptions, ...aoRest } = overrides.ao ?? {};
      deps = {
        ctx,
        ao: { ctx, ports: createPorts(ctx, { ...aoRest, ...(aoOptions ? { options: aoOptions } : {}) }) },
        options: { ...defaultOptions(ctx), ...overrides.options },
        tmdb: () => {
          sources ??= new SourcesRuntime(ctx, overrides.tmdb ? { tmdb: overrides.tmdb } : {});
          return sources.tmdb();
        },
      };
    }
    return deps;
  };
  return {
    name: "file-manager",
    deps() {
      if (!deps) throw new Error("file-manager 尚未装配");
      return deps;
    },
    registerRoutes(app, ctx) {
      registerFileRoutes(app, lazy(ctx));
      registerOrganizeSourceRoutes(app, lazy(ctx));
    },
    registerTasks(registry, ctx) {
      registry.register(
        defineTask({
          name: "scanOrganizeSource",
          version: 1,
          lane: "maintenance",
          inputSchema: z.object({ sourceId: z.string().uuid() }),
          retryPolicy: { maximumAttempts: 3, initialInterval: "5s" },
          handler: async (t) => t.step.run("scan", () => scanOrganizeSource(lazy(ctx), t.input)),
        }),
        defineTask({
          name: "purgeTrash",
          version: 1,
          lane: "maintenance",
          inputSchema: z.object({}).passthrough(),
          retryPolicy: { maximumAttempts: 3, initialInterval: "5s", backoffCoefficient: 2, maximumInterval: "60s" },
          handler: async (t) =>
            t.step.run("purge", async () => {
              const r = await purgeTrash(lazy(ctx), undefined, {});
              return { purged: r.purged.length, failed: r.failed.length };
            }),
        }),
        // S-7:/files/identify 的远端(TMDB)查询;只读,失败发 status=failed 的 identify.completed,不重试
        defineTask({
          name: IDENTIFY_REMOTE_TASK,
          version: 1,
          lane: "network",
          inputSchema: z.object({ body: FilesIdentifyRequest, actorId: z.string() }),
          retryPolicy: { maximumAttempts: 1 },
          handler: async (t) =>
            t.step.run("identify", async () => {
              const r = await runIdentifyRemote(lazy(ctx), t.runId, t.input, t.abortSignal);
              return { status: r.status, items: r.items.length };
            }),
        }),
      );
    },
    start(ctx) {
      const d = lazy(ctx);
      if (!d.options.backgroundLoops) return;
      registerScheduledJob(ctx, {
        key: "organize.sources",
        defaults: {
          name: "整理来源扫描",
          description: "检查来源目录的新文件",
          group: "maintain",
          schedule: { type: "interval", everyMs: 60_000 },
        },
        run: async (c) => queueDueSourceScans(d, c.slot),
      });
      if (d.options.purgeIntervalMs <= 0) return;
      registerScheduledJob(ctx, {
        key: "trash.purge",
        defaults: {
          name: "回收站清理",
          description: "清除过期的回收站项",
          group: "maintain",
          schedule: { type: "interval", everyMs: d.options.purgeIntervalMs },
        },
        run: async (c) => {
          const r = await d.ctx.engine.enqueue(
            "purgeTrash",
            {},
            { idempotencyKey: `purgeTrash:${c.slot}`, traceId: randomUUID() },
          );
          return { summary: r.deduplicated ? "本周期已入队" : "已入队清理" };
        },
      });
    },
  };
}

export const fileManagerModule = createFileManagerModule();