import { createRoute, type RouteConfig } from "@hono/zod-openapi";
import {
  Api,
  type ApiScope,
  apiResponse,
  type BrowserDownloadResult,
  type BrowserNavigation,
  type BrowserScreenshotView,
  type EndpointDef,
  type ManualAcquisitionResult,
} from "@umt/contracts";
import type { Context } from "hono";
import type { z } from "zod";
import { type AuthEnv, requireScope } from "../../http/auth.ts";
import { ApiException } from "../../http/errors.ts";
import { InternalDispatcher } from "../search/dispatch.ts";
import type { ModuleApp } from "../types.ts";
import { type Actor, type BrowserService, BrowserServiceError, imageSize } from "./service.ts";

// C1-E 浏览器 HTTP 端点:原站视图与外部程序共用。读(会话/快照/截图)任何时候可用;
// 输入类动作(导航/点击/输入/滚动/选择/标签页/触发下载)只接受持有人工租约的调用者(先接管)。

type Infer<T> = T extends z.ZodType ? z.infer<T> : Record<string, never>;
interface Input<D extends EndpointDef> {
  params: Infer<D["params"]>;
  query: Infer<D["query"]>;
  body: Infer<D["body"]>;
  c: Context<AuthEnv>;
}

const CODE = {
  not_found: "not_found",
  conflict: "conflict",
  precondition: "precondition_failed",
  bad_request: "bad_request",
  upstream: "upstream_unavailable",
  rate_limited: "rate_limited",
} as const;

function route<D extends EndpointDef>(app: ModuleApp, def: D, handler: (input: Input<D>) => Promise<unknown>) {
  const request: RouteConfig["request"] = {};
  if (def.params) request.params = def.params as never;
  if (def.query) request.query = def.query as never;
  if (def.body) request.body = { content: { "application/json": { schema: def.body as never } }, required: true };
  const r = createRoute({
    method: def.method,
    path: def.path,
    summary: def.summary,
    tags: ["browser"],
    middleware: [requireScope(def.scope as ApiScope)] as never,
    request,
    responses: {
      200: { description: def.summary, content: { "application/json": { schema: apiResponse(def.response) } } },
    },
  });
  // biome-ignore lint/suspicious/noExplicitAny: 路由泛型在封装里擦除,入参已由 zod-openapi 校验
  app.openapi(r, (async (c: any) => {
    const input = {
      params: def.params ? c.req.valid("param") : {},
      query: def.query ? c.req.valid("query") : {},
      body: def.body ? c.req.valid("json") : {},
      c,
    } as Input<D>;
    try {
      const data = def.response.parse(await handler(input));
      return c.json({ ok: true, data }, 200);
    } catch (e) {
      if (e instanceof BrowserServiceError) throw new ApiException(CODE[e.code], e.message);
      throw e;
    }
    // biome-ignore lint/suspicious/noExplicitAny: 同上
  }) as any);
}

/** 人工操作者:控制台会话 / API Key 的身份(租约 holder) */
function human(c: Context<AuthEnv>): Actor {
  const p = c.get("principal");
  return { kind: "human", holder: `${p?.kind ?? "unknown"}:${p?.name ?? p?.id ?? "?"}` };
}

const b64 = (data: Uint8Array) => Buffer.from(data).toString("base64");

export function registerBrowserRoutes(app: ModuleApp, svc: () => BrowserService) {
  const dispatch = new InternalDispatcher(app);
  const B = Api.browser;

  route(app, B.providers, async ({ query }) => ({ items: await svc().listProviders(query.probe === "true") }));

  route(app, B.sessions, async ({ query }) => ({
    items: await svc().list({
      ...(query.siteId ? { siteId: query.siteId } : {}),
      includeClosed: query.includeClosed === "true",
    }),
  }));

  route(app, B.open, async ({ body }) => {
    const id = await svc().open({
      siteId: body.siteId,
      ...(body.accountId !== undefined ? { accountId: body.accountId } : {}),
      ...(body.providerId ? { providerId: body.providerId } : {}),
      ...(body.url ? { url: body.url } : {}),
    });
    return svc().view(id);
  });

  route(app, B.get, async ({ params }) => svc().view(params.id));

  route(app, B.close, async ({ params }) => {
    await svc().close(params.id, "closed_by_user");
    return svc().view(params.id);
  });

  route(app, B.openTab, async ({ params, body, c }) => {
    await svc().run(params.id, human(c), async (p, ref, x) => {
      if (body.url) await svc().limited(x.site);
      return p.openTab(ref.sessionId, { ...(body.url ? { url: body.url } : {}), budget: x.budget, as: "human" });
    });
    return svc().view(params.id);
  });

  route(app, B.closeTab, async ({ params, c }) => {
    await svc().run(params.id, human(c), (p, ref) => p.closeTab(ref), { tabId: params.tabId });
    return svc().view(params.id);
  });

  route(app, B.navigate, async ({ params, body, c }): Promise<BrowserNavigation> => {
    if (!body.url && !body.action) throw new ApiException("bad_request", "url 与 action 二选一");
    const out = await svc().run(
      params.id,
      human(c),
      async (p, ref, x) => {
        await svc().limited(x.site);
        const nav = body.url ? await p.navigate(ref, body.url, x.budget) : await p.history(ref, body.action!, x.budget);
        return { ...nav, loginRequired: p.sessionInfo(ref.sessionId)?.loginPage ?? false };
      },
      body.tabId ? { tabId: body.tabId } : {},
    );
    return { ...out, session: await svc().view(params.id) };
  });

  route(app, B.snapshot, async ({ params, query, c }) =>
    svc().run(
      params.id,
      human(c),
      (p, ref) => p.snapshot(ref, query.offset !== undefined ? { offset: query.offset } : {}),
      { write: false, ...(query.tabId ? { tabId: query.tabId } : {}) },
    ),
  );

  route(app, B.screenshot, async ({ params, query, c }): Promise<BrowserScreenshotView> => {
    const shot = await svc().run(params.id, human(c), (p, ref) => p.screenshot(ref, { maxBytes: 8 * 1024 * 1024 }), {
      write: false,
      persist: false,
      ...(query.tabId ? { tabId: query.tabId } : {}),
    });
    const view = await svc().view(params.id);
    return {
      mimeType: shot.mimeType,
      dataBase64: b64(shot.data),
      ...imageSize(shot.data),
      url: shot.url,
      modelSafe: shot.modelSafe,
      capturedAt: shot.capturedAt,
      controller: view.controller,
    };
  });

  const ok = async (id: string) => ({ ok: true as const, session: await svc().view(id) });

  route(app, B.click, async ({ params, body, c }) => {
    await svc().run(
      params.id,
      human(c),
      (p, ref) => p.click(ref, body.target),
      body.tabId ? { tabId: body.tabId } : {},
    );
    return ok(params.id);
  });

  route(app, B.type, async ({ params, body, c }) => {
    await svc().run(
      params.id,
      human(c),
      async (p, ref, x) => {
        if (body.key) return p.press(ref, body.key);
        if (!body.credential && body.text === undefined)
          throw new BrowserServiceError("bad_request", "text / credential / key 至少给一个");
        const extra = {
          ...(body.submit !== undefined ? { submit: body.submit } : {}),
          ...(body.clear !== undefined ? { clear: body.clear } : {}),
        };
        return p.type(
          ref,
          body.target ?? null,
          body.credential
            ? { kind: "secret", siteId: x.row.site_id, accountId: x.row.account_id, field: body.credential, ...extra }
            : { kind: "text", text: body.text ?? "", ...extra },
        );
      },
      body.tabId ? { tabId: body.tabId } : {},
    );
    return ok(params.id);
  });

  route(app, B.scroll, async ({ params, body, c }) => {
    await svc().run(
      params.id,
      human(c),
      (p, ref) => p.scroll(ref, { direction: body.direction, amount: body.amount }),
      body.tabId ? { tabId: body.tabId } : {},
    );
    return ok(params.id);
  });

  route(app, B.select, async ({ params, body, c }) => {
    await svc().run(
      params.id,
      human(c),
      (p, ref) => p.select(ref, body.target, body.value),
      body.tabId ? { tabId: body.tabId } : {},
    );
    return ok(params.id);
  });

  route(app, B.extract, async ({ params, body, c }) => ({
    data: await svc().run(params.id, human(c), (p, ref) => p.extract(ref, body.schema), {
      write: false,
      ...(body.tabId ? { tabId: body.tabId } : {}),
    }),
  }));

  // 下载:给 target 视为人工输入(需接管);不给 target 只等待已触发的下载。
  // 产物暂存核验后,给 submit 时转调 POST /acquisition-plans(同一鉴权、同一计划/去重/阈值/授权检查)。
  route(app, B.download, async ({ params, body, c }): Promise<BrowserDownloadResult> => {
    const artifact = await svc().run(
      params.id,
      human(c),
      async (p, ref) => {
        if (body.target) await p.click(ref, body.target);
        return p.waitForDownload(ref, { timeoutMs: body.timeoutMs, maxBytes: 10 * 1024 * 1024 });
      },
      { write: !!body.target, ...(body.tabId ? { tabId: body.tabId } : {}) },
    );
    const v = await svc().verifyDownload(params.id, artifact);
    let submission: ManualAcquisitionResult | null = null;
    let note: string | null = null;
    if (v.duplicate) note = "同一会话已捕获过这个文件,未重复提交";
    else if (!v.verification.valid) note = "不是有效的种子文件,未提交";
    else if (!v.sourceReleaseId) note = "资源不在本地索引(先快照或搜索该站点),未提交";
    else if (body.submit) {
      try {
        submission = await dispatch.call<ManualAcquisitionResult>(c, "POST", "/acquisition-plans", {
          ...body.submit,
          sourceReleaseId: v.sourceReleaseId,
        });
        if (!submission.submitted) note = "提交未生成下载计划,见 rejected";
      } catch (e) {
        // 与 POST /acquisition-plans 相同的拒绝(未识别、无授权等):产物已暂存,结果照常返回
        if (!(e instanceof ApiException) || e.code === "internal") throw e;
        note = `提交未通过:${e.message}`;
      }
    }
    await svc().recordDownload(params.id, {
      sha256: artifact.sha256,
      artifactId: artifact.id,
      sourceReleaseId: v.sourceReleaseId,
      planId: submission?.plan?.id ?? v.duplicate?.planId ?? null,
    });
    return {
      artifact,
      verification: v.verification,
      sourceReleaseId: v.sourceReleaseId,
      duplicate: !!v.duplicate,
      submission,
      note,
    };
  });

  route(app, B.acquire, async ({ params, body, c }) => {
    const lease = await svc().acquire(params.id, human(c).holder, body.reason, body.ttlMs);
    return { lease, session: await svc().view(params.id) };
  });

  route(app, B.release, async ({ params, body }) => {
    const lease = await svc().release(params.id, {
      ...(body.leaseId ? { leaseId: body.leaseId } : {}),
      reason: body.reason,
      to: body.to,
    });
    return { lease, session: await svc().view(params.id) };
  });
}