import { chmod, mkdir, rm, stat, symlink, writeFile } from "node:fs/promises";
import { assert, expect, test } from "vite-plus/test";

import { isNotFound } from "#common";
import type { RuntimeFailure, RuntimeManifest, RuntimeOutcome } from "#runtime";
import { currentGid, currentUid, IS_WINDOWS, makeTempDir } from "#testing";

import { type Fetcher, type PostContext, postRuntime } from "./post.ts";

const context: PostContext = {
  apiUrl: "https://gitea.example/api/v1",
  repository: "owner/repo",
  issueIndex: "7",
  eventName: "issue_comment",
};

interface Fixture {
  manifestPath: string;
  runtimeDir: string;
  reviewerFile: string;
  reviewPath: string;
  outcomeFile: string;
}

interface FixtureSuccess {
  ok: true;
  body: string;
}

type FixtureSource = RuntimeFailure | FixtureSuccess;

// One request the fake Gitea received.
interface RecordedRequest {
  url: string;
  init: RequestInit;
}

async function writePrivate(path: string, text: string): Promise<void> {
  await writeFile(path, text, { mode: 0o600 });
  await chmod(path, 0o600);
}

async function writeArtifacts(
  outcome: RuntimeOutcome,
  review?: string,
  anchors?: unknown,
): Promise<void> {
  if (!outcome.ok) return;
  if (review !== undefined) await writePrivate(outcome.reviewPath, review);
  if (anchors !== undefined) await writePrivate(outcome.anchorsPath, JSON.stringify(anchors));
}

function manifestFor(runtimeDir: string, profileHome: string): RuntimeManifest {
  return {
    runtimeDir,
    manifestPath: `${runtimeDir}/manifest.json`,
    reviewerFile: `${runtimeDir}/reviewer-token`,
    outcomeFile: `${runtimeDir}/outcome.json`,
    profiles: [
      {
        index: 0,
        type: "claude",
        model: "test",
        uid: currentUid(),
        gid: currentGid(),
        home: profileHome,
        tokenFile: null,
      },
    ],
  };
}

async function fixture(
  source: FixtureSource,
  review?: string,
  anchors?: unknown,
): Promise<Fixture> {
  const runtimeDir = await makeTempDir();
  const profileHome = `${runtimeDir}/profile-0`;
  const manifest = manifestFor(runtimeDir, profileHome);
  await mkdir(profileHome);
  await writeFile(manifest.reviewerFile, "reviewer-secret");
  const outcome: RuntimeOutcome = source.ok
    ? {
        ...source,
        profile: { type: "codex", model: "gpt-test" },
        reviewPath: `${profileHome}/review.md`,
        anchorsPath: `${profileHome}/anchors.json`,
      }
    : source;
  await writeFile(manifest.outcomeFile, JSON.stringify(outcome));
  await writeArtifacts(outcome, review, anchors);
  await writeFile(manifest.manifestPath, JSON.stringify(manifest));
  const { manifestPath, reviewerFile, outcomeFile } = manifest;
  return {
    manifestPath,
    runtimeDir,
    reviewerFile,
    reviewPath: `${profileHome}/review.md`,
    outcomeFile,
  };
}

const missing = async (path: string): Promise<boolean> => {
  try {
    await stat(path);
    return false;
  } catch (error) {
    if (isNotFound(error)) return true;
    throw error;
  }
};

// The JSON body of one request the fake Gitea received.
function requestBody(init?: RequestInit): unknown {
  return typeof init?.body === "string" ? JSON.parse(init.body) : undefined;
}

// A fake Gitea that records each request body and answers with `status`.
function recordingFetch(bodies: unknown[], status = 201): Fetcher {
  return (_url, init) => {
    bodies.push(requestBody(init));
    return Promise.resolve(new Response(null, { status }));
  };
}

test("posts a successful issue result and removes runtime credentials", async () => {
  const result = await fixture({ ok: true, body: "done" });
  const requests: RecordedRequest[] = [];

  await postRuntime(result.manifestPath, context, (url, init) => {
    requests.push({ url, init });
    return Promise.resolve(new Response(null, { status: 201 }));
  });

  expect(requests.length).toBe(1);
  const [request] = requests;
  expect(request?.url).toStrictEqual(`${context.apiUrl}/repos/owner/repo/issues/7/comments`);
  expect(requestBody(request?.init)).toStrictEqual({
    body: "done\n\n> Profile: `codex` · `gpt-test`",
  });
  expect(request?.init?.headers).toStrictEqual({
    Authorization: "token reviewer-secret",
    "Content-Type": "application/json",
  });
  assert(await missing(result.runtimeDir));
});

test("retries a rejected inline review without anchors", async () => {
  const result = await fixture({ ok: true, body: "ignored final response" }, "Approved\nReady", [
    { path: "run.ts", line: 1, side: "new", body: "Finding" },
  ]);
  const bodies: unknown[] = [];

  await postRuntime(
    result.manifestPath,
    {
      ...context,
      eventName: "pull_request",
    },
    (_url, init) => {
      bodies.push(requestBody(init));
      return Promise.resolve(new Response(null, { status: bodies.length === 1 ? 422 : 200 }));
    },
  );

  expect(bodies[0]).toMatchObject({
    comments: [{ body: "Finding\n\n> Profile: `codex` · `gpt-test`" }],
  });
  expect(bodies[1]).toMatchObject({
    comments: [],
    body: "✅ Approved\nReady\n\n> Profile: `codex` · `gpt-test`",
  });
  assert(await missing(result.runtimeDir));
});

test("reports each tried profile and keeps the action failed", async () => {
  const result = await fixture({
    ok: false,
    failures: [
      { type: "codex", model: "gpt-test", reason: "sign-in failed" },
      { type: "claude", model: "claude-test", reason: "usage exhausted" },
      { type: "opencode", model: "openrouter/test", reason: "failed" },
    ],
  });
  const bodies: unknown[] = [];

  await expect(() =>
    postRuntime(result.manifestPath, context, recordingFetch(bodies)),
  ).rejects.toThrow("agent phase failed");

  expect(bodies).toStrictEqual([
    {
      body:
        "AI bot failed.\n\n> Tried: `codex` · `gpt-test` (sign-in failed), " +
        "`claude` · `claude-test` (usage exhausted), " +
        "`opencode` · `openrouter/test` (failed)",
    },
  ]);
  assert(!JSON.stringify(bodies).includes("reviewer-secret"));
  assert(await missing(result.runtimeDir));
});

test("drops failure entries that are not known labels", async () => {
  const result = await fixture({ ok: false, failures: [] });
  await writeFile(
    result.outcomeFile,
    JSON.stringify({
      ok: false,
      failures: [
        { type: "codex", model: "gpt-test", reason: "token sk-secret leaked" },
        { type: "shell", model: "x", reason: "failed" },
        { type: "claude", model: "claude-test", reason: "sign-in failed" },
      ],
    }),
  );
  const bodies: unknown[] = [];

  await expect(() =>
    postRuntime(result.manifestPath, context, recordingFetch(bodies)),
  ).rejects.toThrow("agent phase failed");

  expect(bodies).toStrictEqual([
    {
      body: "AI bot failed.\n\n> Tried: `claude` · `claude-test` (sign-in failed)",
    },
  ]);
});

test("reports a generic failure when the runner wrote no outcome", async () => {
  const result = await fixture({ ok: false, failures: [] });
  await rm(result.outcomeFile);
  const bodies: unknown[] = [];

  await expect(() =>
    postRuntime(result.manifestPath, context, recordingFetch(bodies)),
  ).rejects.toThrow("agent phase failed");

  expect(bodies).toStrictEqual([{ body: "AI bot failed.\n\n> Profile: none" }]);
  assert(await missing(result.runtimeDir));
});

test("removes runtime credentials when posting fails", async () => {
  const result = await fixture({ ok: true, body: "done" });

  await expect(() =>
    postRuntime(result.manifestPath, context, () =>
      Promise.resolve(new Response("failed", { status: 500 })),
    ),
  ).rejects.toThrow("500");
  assert(await missing(result.runtimeDir));
});

test("preserves a Gitea transport failure without retrying a comment", async () => {
  const result = await fixture({ ok: true, body: "done" });
  let requests = 0;

  await expect(() =>
    postRuntime(result.manifestPath, context, () => {
      requests += 1;
      return Promise.reject(new Error(`network failure ${requests}`));
    }),
  ).rejects.toThrow("network failure 1");

  expect(requests).toBe(1);
  assert(await missing(result.runtimeDir));
});

test.skipIf(IS_WINDOWS)("refuses to follow an agent artifact symlink", async () => {
  const result = await fixture({ ok: true, body: "done" });
  await symlink(result.reviewerFile, result.reviewPath);
  let requests = 0;

  await expect(() =>
    postRuntime(result.manifestPath, context, () => {
      requests += 1;
      return Promise.resolve(new Response(null, { status: 200 }));
    }),
  ).rejects.toThrow("regular private file");

  expect(requests).toBe(1);
  assert(await missing(result.runtimeDir));
});

test("reports an attributed failure when a pull request review is missing", async () => {
  const result = await fixture({ ok: true, body: "done" });
  const bodies: unknown[] = [];

  await expect(() =>
    postRuntime(
      result.manifestPath,
      {
        ...context,
        eventName: "pull_request",
      },
      recordingFetch(bodies),
    ),
  ).rejects.toThrow("did not write");

  expect(bodies).toStrictEqual([
    {
      body: "AI bot failed.\n\n> Tried: `codex` · `gpt-test` (failed)",
    },
  ]);
  assert(await missing(result.runtimeDir));
});