// Pins the review-loop contract of the orchestration Workflow scripts (ersatztv#907, #911):
// a round carrying any blocking OR should-fix finding goes back to the fixer whatever the lens's
// verdict word; nits alone end the loop; a round in which every lens failed is an error, never a
// clean pass; the recorded history binds each fix to the round it answered and names only the
// commits that fix added; and the post-rebase round applies the same filter.
//
// The scripts run inside the Workflow tool, which supplies agent/parallel/phase/log and top-level
// await/return. This harness compiles each script body as an AsyncFunction with stubbed versions of
// those, so it executes the COMMITTED control flow rather than a re-description of it.
import { readFileSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { dirname, resolve } from 'node:path';
import { describe, expect, it } from 'vitest';

const here = dirname(fileURLToPath(import.meta.url));
const scriptsDir = resolve(here, '../../.claude/workflows');
const AsyncFunction = Object.getPrototypeOf(async function () {}).constructor;

function compile(name) {
  const src = readFileSync(resolve(scriptsDir, name), 'utf8');
  const body = src.replace(/^export const meta = \{[\s\S]*?\n\}\n/, '');
  return new AsyncFunction('args', 'agent', 'parallel', 'phase', 'log', body);
}

const TRAILER = 'Co-Authored-By: t <t@example>\nClaude-Session: https://example/session';
const buildArgs = {
  issues: [1], slug: 's', title: 't', body_summary: 'b', done_condition: 'd', files_likely: [],
  area: 'docs', size: 'small', risk: 'routine', needs_e2e: false, port: 8440, avoid: [], trailer: TRAILER,
};
const resumeArgs = {
  issues: [1], branch: 'b', wt: '/tmp/wt', pr: 42, mode: 'fix', title: 't', risk: 'routine',
  needs_e2e: false, port: 8440, trailer: TRAILER, brief: '/tmp/brief.json',
};

const IMPL_COMMITS = 'aaaaaaa feat(1): the implementer commit';
const finding = (severity) => ({ severity, file: 'f', summary: `${severity} finding`, evidence: 'e' });

// Every stub lens returns the same findings, so a finding counts once per lens (two lenses → 2).
// reviewRounds: array indexed by round-1 of {findings, lensesNull?}; landOverrides: extra fields on the finisher report;
// postRebase: findings returned by the review after a patch-changing rebase, or 'lensesNull'; fixerNull: the fixer agent dies.
function run(script, args, { reviewRounds, landOverrides = {}, postRebase = null, fixerNull = false, fixerDone = true, fixerCommits = null }) {
  const calls = [];
  let round = 0;
  let fixCount = 0;
  const agent = async (prompt, opts) => {
    const label = (opts && opts.label) || '';
    calls.push({ label, prompt, opts });
    if (label.startsWith('impl:') || label.startsWith('fix:#')) return { done: true, summary: '', verified: '', left: '', commits: IMPL_COMMITS };
    if (label.startsWith('review:')) {
      const spec = reviewRounds[round - 1] || { findings: [] };
      if (spec.lensesNull) return null;
      return { verdict: 'merge', findings: spec.findings };
    }
    if (label.startsWith('fix:r')) {
      fixCount += 1;
      if (fixerNull) return null;
      if (!fixerDone) return { done: false, summary: 'stopped', verified: '', left: 'blocked', commits: IMPL_COMMITS };
      return { done: true, summary: '', verified: '', left: '', commits: fixerCommits !== null ? fixerCommits : `f${fixCount}xxxxx fix round ${fixCount}\n${IMPL_COMMITS}` };
    }
    if (label.startsWith('land:')) return { done: true, summary: '', verified: '', left: '', commits: '', pr_url: 'http://pr/1', head_sha: 'deadbeef', patch_changed: false, ...landOverrides };
    throw new Error(`unexpected agent label ${label}`);
  };
  const parallel = async (thunks) => {
    round += 1;
    if (postRebase !== null && calls.some((c) => c.label.startsWith('land:'))) {
      return Promise.all(thunks.map(() => Promise.resolve(postRebase === 'lensesNull' ? null : { verdict: 'merge', findings: postRebase })));
    }
    return Promise.all(thunks.map((t) => t().catch(() => null)));
  };
  return script(args, agent, parallel, () => {}, () => {}).then((result) => ({ result, calls, fixCount }));
}

const cases = [
  ['ersatztv-issue-build.js', buildArgs],
  ['ersatztv-resume-branch.js', resumeArgs],
];

describe.each(cases)('%s review loop', (name, args) => {
  const script = compile(name);
  const finisherPrompt = (calls) => calls.find((c) => c.label.startsWith('land:')).prompt;

  it('a clean first round lands with zero fix rounds and says so', async () => {
    const { result, calls, fixCount } = await run(script, args, { reviewRounds: [{ findings: [finding('nit')] }] });
    expect(result.error).toBeUndefined();
    expect(fixCount).toBe(0);
    expect(finisherPrompt(calls)).toContain('round 1: 2 lens(es); 0 blocking, 0 should-fix, 2 nit; clean — loop ended');
    expect(finisherPrompt(calls)).toContain('no fix commit exists');
  });

  it('a should-fix finding sends the round back even though the lens said merge', async () => {
    const { result, calls, fixCount } = await run(script, args, {
      reviewRounds: [{ findings: [finding('should-fix')] }, { findings: [] }],
    });
    expect(result.error).toBeUndefined();
    expect(fixCount).toBe(1);
    const hist = finisherPrompt(calls);
    expect(hist).toContain('round 1: 2 lens(es); 0 blocking, 2 should-fix, 0 nit; answered by fix commit(s): f1xxxxx fix round 1');
    expect(hist).toContain('round 2: 2 lens(es); 0 blocking, 0 should-fix, 0 nit; clean — loop ended');
    expect(hist).not.toContain(IMPL_COMMITS);
    expect(hist).toContain('what each of these fix commits changed');
  });

  it('a blocking finding that survives two fix rounds stops before the push', async () => {
    const { result, calls, fixCount } = await run(script, args, {
      reviewRounds: [{ findings: [finding('blocking')] }, { findings: [finding('blocking')] }, { findings: [finding('blocking')] }],
    });
    expect(fixCount).toBe(2);
    expect(result.error).toMatch(/^blocking findings after two fix rounds/);
    expect(calls.some((c) => c.label.startsWith('land:'))).toBe(false);
  });

  it('a should-fix finding that survives two fix rounds stops before the push', async () => {
    const { result, calls, fixCount } = await run(script, args, {
      reviewRounds: [{ findings: [finding('should-fix')] }, { findings: [finding('should-fix')] }, { findings: [finding('should-fix')] }],
    });
    expect(fixCount).toBe(2);
    expect(result.error).toMatch(/^should-fix findings still open after two fix rounds/);
    expect(calls.some((c) => c.label.startsWith('land:'))).toBe(false);
  });

  it('a round in which every lens failed is an error, not a clean round', async () => {
    const { result, calls, fixCount } = await run(script, args, { reviewRounds: [{ lensesNull: true }] });
    expect(fixCount).toBe(0);
    expect(result.error).toMatch(/^review round 1 produced no reviews/);
    expect(calls.some((c) => c.label.startsWith('land:'))).toBe(false);
  });

  it('a round in which every lens failed AFTER a fix round is an error, not a clean round', async () => {
    const { result, calls, fixCount } = await run(script, args, {
      reviewRounds: [{ findings: [finding('should-fix')] }, { lensesNull: true }],
    });
    expect(fixCount).toBe(1);
    expect(result.error).toMatch(/^review round 2 produced no reviews/);
    expect(calls.some((c) => c.label.startsWith('land:'))).toBe(false);
  });

  it('a fixer that dies is an error, not a clean round', async () => {
    const { result, calls } = await run(script, args, { reviewRounds: [{ findings: [finding('should-fix')] }], fixerNull: true });
    expect(result.error).toMatch(/^fixer for round 1 returned nothing/);
    expect(calls.some((c) => c.label.startsWith('land:'))).toBe(false);
  });

  it('a fixer that stops (done=false) is an error, not a clean round', async () => {
    const { result, calls } = await run(script, args, { reviewRounds: [{ findings: [finding('should-fix')] }], fixerDone: false });
    expect(result.error).toMatch(/^fixer for round 1 stopped/);
    expect(calls.some((c) => c.label.startsWith('land:'))).toBe(false);
  });

  it('findings answered without a new commit are described as such, never as a clean round one', async () => {
    const { calls } = await run(script, args, { reviewRounds: [{ findings: [finding('should-fix')] }, { findings: [] }], fixerCommits: IMPL_COMMITS });
    const p = finisherPrompt(calls);
    expect(p).toContain('answered without a new commit');
    expect(p).toContain('every finding was answered without a new commit');
    expect(p).not.toContain('round one was clean');
  });

  it('a post-rebase round in which every lens failed is an error, never a verdict', async () => {
    const { result } = await run(script, args, { reviewRounds: [{ findings: [] }], landOverrides: { patch_changed: true }, postRebase: 'lensesNull' });
    expect(result.error).toMatch(/^the post-rebase review round produced no reviews/);
  });

  it('a should-fix on the pushed head after a patch-changing rebase is an error', async () => {
    const { result } = await run(script, args, {
      reviewRounds: [{ findings: [] }],
      landOverrides: { patch_changed: true },
      postRebase: [finding('should-fix')],
    });
    expect(result.error).toMatch(/^blocking or should-fix findings on the pushed head/);
  });
});