import { readFileSync } from "node:fs";
import { join } from "node:path";
import { apiToolPath, TOOLS } from "@snapotter/shared";
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import { waitForJob } from "../../../apps/api/src/jobs/enqueue.js";
import { resolveToolPool } from "../../../apps/api/src/lib/pool.js";
import { TOOL_DISPLAY_MODES } from "../../../apps/web/src/lib/tool-display-modes.js";
import { fixtureDir } from "../../fixtures/index.js";
import { cancelAcceptedJobAndWait } from "../settle-job.js";
import {
  buildTestApp,
  createMultipartPayload,
  loginAsAdmin,
  type TestApp,
} from "../test-server.js";

/**
 * Hostile-input matrix: every tool route must reject malformed, truncated,
 * lying, or bomb-shaped files with a clean 4xx (or 501 for uninstalled AI
 * bundles). A 500, a hang, or a success response for garbage is a bug in the
 * tool, not in this test.
 *
 * Fixtures come from scripts/generate-hostile-fixtures.mjs (committed).
 */

/** Fixtures that are unreadable garbage: the server must NOT report success. */
const GARBAGE_FIXTURES = ["truncated.jpg", "zero-byte.png", "garbage.jpg", "bomb-50000x50000.png"];

/** Valid PNG bytes behind a lying .jpg extension: success or clean 4xx are both
 * fine (tools sniff content, some require a specific input type); 5xx is not. */
const MISMATCH_FIXTURE = "png-bytes.jpg";

const REJECT_STATUSES = new Set([400, 413, 415, 422, 501]);

// Tools that never decode the uploaded pixel data: no-dropzone generators take
// input from settings, bulk-rename zips bytes verbatim, and the metadata tools
// operate on metadata segments only. Succeeding on a file with a valid header
// but broken pixel data is correct behavior for them; everything else must
// reject.
const INPUT_AGNOSTIC = new Set(
  TOOLS.filter((t) => TOOL_DISPLAY_MODES[t.id] === "no-dropzone").map((t) => t.id),
);
INPUT_AGNOSTIC.add("bulk-rename");
INPUT_AGNOSTIC.add("edit-metadata");
INPUT_AGNOSTIC.add("strip-metadata");
INPUT_AGNOSTIC.add("info");
INPUT_AGNOSTIC.add("image-to-base64");

/** Server-error statuses; 501 (feature not installed) is a clean rejection. */
const SERVER_ERRORS = [500, 502, 503, 504];

describe("hostile input matrix", () => {
  let testApp: TestApp;
  let adminToken: string;

  beforeAll(async () => {
    testApp = await buildTestApp();
    adminToken = await loginAsAdmin(testApp.app);
  }, 30_000);

  afterAll(async () => {
    await testApp.cleanup();
  }, 10_000);

  async function postFile(toolId: string, fixtureName: string) {
    const content = readFileSync(join(fixtureDir.hostile, fixtureName));
    const { body, contentType } = createMultipartPayload([
      { name: "file", filename: fixtureName, contentType: "application/octet-stream", content },
      { name: "settings", content: "{}" },
    ]);
    const started = Date.now();
    const res = await testApp.app.inject({
      method: "POST",
      url: apiToolPath(toolId),
      headers: { authorization: `Bearer ${adminToken}`, "content-type": contentType },
      body,
    });
    return { res, elapsedMs: Date.now() - started };
  }

  function acceptedJob(toolId: string, fixtureName: string, body: string) {
    const accepted = JSON.parse(body) as { jobId?: unknown; async?: unknown };
    expect(accepted, `${toolId} returned an invalid 202 body for ${fixtureName}`).toMatchObject({
      jobId: expect.any(String),
      async: true,
    });

    return { jobId: accepted.jobId as string, pool: resolveToolPool(toolId) };
  }

  async function settleAcceptedResponse(toolId: string, fixtureName: string, body: string) {
    const { jobId, pool } = acceptedJob(toolId, fixtureName, body);
    await cancelAcceptedJobAndWait(jobId, pool);
  }

  async function expectAsyncRejection(toolId: string, fixtureName: string, body: string) {
    const { jobId, pool } = acceptedJob(toolId, fixtureName, body);
    const started = Date.now();
    const outcome = await waitForJob(pool, jobId, 15_000).then(
      (result) => ({ kind: "finished" as const, result }),
      (error: unknown) => ({ kind: "failed" as const, error }),
    );

    if (outcome.kind === "finished") {
      if (outcome.result === null) {
        await cancelAcceptedJobAndWait(jobId, pool);
        expect.fail(`${toolId} did not reject ${fixtureName} within 15000ms`);
      }
      expect.fail(`${toolId} completed hostile input ${fixtureName}`);
    }

    expect(
      Date.now() - started,
      `${toolId} took too long to reject ${fixtureName} asynchronously`,
    ).toBeLessThan(15_000);

    // Async tools report post-enqueue failures through their terminal SSE
    // frame. Verify the public contract, including that it exposes a concise
    // error rather than a worker stack trace.
    const progress = await testApp.app.inject({
      method: "GET",
      url: `/api/v1/jobs/${jobId}/progress`,
      headers: { authorization: `Bearer ${adminToken}` },
    });
    expect(progress.statusCode).toBe(200);
    const frames = progress.body
      .split(/\r?\n/)
      .filter((line) => line.startsWith("data: "))
      .map((line) => JSON.parse(line.slice(6)) as Record<string, unknown>);
    const terminal = frames.at(-1);
    expect(terminal, `${toolId} emitted no terminal SSE frame for ${fixtureName}`).toMatchObject({
      jobId,
      type: "single",
      phase: "failed",
      error: expect.any(String),
    });
    expect(String(terminal?.error)).not.toMatch(/\n\s*at\s/u);
  }

  for (const tool of TOOLS) {
    const toolId = tool.id;
    it(`${toolId} rejects hostile files cleanly`, async () => {
      for (const fixture of GARBAGE_FIXTURES) {
        const { res, elapsedMs } = await postFile(toolId, fixture);

        expect(
          SERVER_ERRORS.includes(res.statusCode),
          `${toolId} returned ${res.statusCode} for ${fixture}: ${res.body.slice(0, 300)}`,
        ).toBe(false);
        expect(elapsedMs, `${toolId} took ${elapsedMs}ms on ${fixture}`).toBeLessThan(15_000);

        if (INPUT_AGNOSTIC.has(toolId)) {
          if (res.statusCode === 202) {
            await settleAcceptedResponse(toolId, fixture, res.body);
          }
          continue;
        }

        if (res.statusCode === 202) {
          await expectAsyncRejection(toolId, fixture, res.body);
          continue;
        }

        expect(
          REJECT_STATUSES.has(res.statusCode),
          `${toolId} did not reject ${fixture} (got ${res.statusCode})`,
        ).toBe(true);

        // Error responses must be structured JSON, not stack traces
        const parsed = JSON.parse(res.body) as { error?: string };
        expect(parsed.error, `${toolId} 4xx body has no error field for ${fixture}`).toBeTruthy();
      }

      // Lying extension with valid content: anything but a server error is fine
      const { res } = await postFile(toolId, MISMATCH_FIXTURE);
      expect(
        SERVER_ERRORS.includes(res.statusCode),
        `${toolId} returned ${res.statusCode} for ${MISMATCH_FIXTURE}: ${res.body.slice(0, 300)}`,
      ).toBe(false);
      if (res.statusCode === 202) {
        await settleAcceptedResponse(toolId, MISMATCH_FIXTURE, res.body);
      }
    }, 120_000);
  }
});