// tests/hooks/otel-export.test.mjs
// SC #14: Stop-hook orchestration — opt-in via VOYAGE_EXPORT_MODE.
// Fail-soft contract: any error → exit 0, [voyage] stderr, no Stop blocking.

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { mkdtempSync, rmSync, existsSync, readFileSync, writeFileSync, mkdirSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { tmpdir } from 'node:os';
import { fileURLToPath } from 'node:url';
import { runHookWithEnv } from '../helpers/hook-helper.mjs';

const __dirname = dirname(fileURLToPath(import.meta.url));
const HOOK_PATH = join(__dirname, '..', '..', 'hooks', 'scripts', 'otel-export.mjs');

function setupDataDir() {
  const dir = mkdtempSync(join(tmpdir(), 'voyage-otel-data-'));
  // Seed minimal stats files
  writeFileSync(join(dir, 'trekplan-stats.jsonl'),
    JSON.stringify({ ts: '2026-05-09T08:00:00.000Z', slug: 'test', mode: 'default', codebase_files: 100, profile: 'premium' }) + '\n');
  return dir;
}

test('SC #14: VOYAGE_EXPORT_MODE=off → silent exit 0, no file written', async () => {
  const dataDir = setupDataDir();
  try {
    const target = join(dataDir, 'voyage.prom');
    const r = await runHookWithEnv(HOOK_PATH, '{}', {
      VOYAGE_EXPORT_MODE: 'off',
      CLAUDE_PLUGIN_DATA: dataDir,
    });
    assert.equal(r.code, 0);
    assert.equal(existsSync(target), false, 'voyage.prom should NOT be written in off-mode');
    assert.equal(r.stderr, '', 'no stderr expected');
  } finally {
    rmSync(dataDir, { recursive: true, force: true });
  }
});

test('SC #14: VOYAGE_EXPORT_MODE unset → silent exit 0 (default off behavior)', async () => {
  const dataDir = setupDataDir();
  try {
    const target = join(dataDir, 'voyage.prom');
    const r = await runHookWithEnv(HOOK_PATH, '{}', {
      CLAUDE_PLUGIN_DATA: dataDir,
      VOYAGE_EXPORT_MODE: '', // explicit empty (mimics unset)
    });
    assert.equal(r.code, 0);
    assert.equal(existsSync(target), false);
  } finally {
    rmSync(dataDir, { recursive: true, force: true });
  }
});

test('SC #14: VOYAGE_EXPORT_MODE=textfile + valid CLAUDE_PLUGIN_DATA → writes voyage.prom', async () => {
  const dataDir = setupDataDir();
  try {
    const target = join(dataDir, 'voyage.prom');
    const r = await runHookWithEnv(HOOK_PATH, '{}', {
      VOYAGE_EXPORT_MODE: 'textfile',
      CLAUDE_PLUGIN_DATA: dataDir,
    });
    assert.equal(r.code, 0);
    assert.equal(existsSync(target), true, `voyage.prom should be written; stderr: ${r.stderr}`);
    const text = readFileSync(target, 'utf-8');
    assert.match(text, /# HELP /);
    assert.match(text, /# TYPE /);
    assert.match(text, /voyage_trekplan_codebase_files/);
  } finally {
    rmSync(dataDir, { recursive: true, force: true });
  }
});

test('SC #14: VOYAGE_EXPORT_MODE=invalid → stderr [voyage] warning + exit 0 (NOT blocking)', async () => {
  const dataDir = setupDataDir();
  try {
    const r = await runHookWithEnv(HOOK_PATH, '{}', {
      VOYAGE_EXPORT_MODE: 'banana',
      CLAUDE_PLUGIN_DATA: dataDir,
    });
    assert.equal(r.code, 0, 'invalid mode MUST NOT block Stop');
    assert.match(r.stderr, /\[voyage\]/);
    assert.match(r.stderr, /banana/);
  } finally {
    rmSync(dataDir, { recursive: true, force: true });
  }
});

test('SC #14: VOYAGE_EXPORT_MODE=otlp + invalid endpoint → stderr [voyage] warn + exit 0', async () => {
  const dataDir = setupDataDir();
  try {
    const r = await runHookWithEnv(HOOK_PATH, '{}', {
      VOYAGE_EXPORT_MODE: 'otlp',
      VOYAGE_OTEL_ENDPOINT: 'http://example.com/v1/metrics', // public-http rejected
      CLAUDE_PLUGIN_DATA: dataDir,
    });
    assert.equal(r.code, 0);
    assert.match(r.stderr, /\[voyage\]/);
  } finally {
    rmSync(dataDir, { recursive: true, force: true });
  }
});

test('SC #14: tail-latency for textfile mode < 200ms (NFR)', async () => {
  const dataDir = setupDataDir();
  try {
    const start = performance.now();
    const r = await runHookWithEnv(HOOK_PATH, '{}', {
      VOYAGE_EXPORT_MODE: 'textfile',
      CLAUDE_PLUGIN_DATA: dataDir,
    });
    const elapsed = performance.now() - start;
    assert.equal(r.code, 0);
    // 200ms NFR with extra headroom for cold-start node spawn (~100ms typical)
    assert.ok(elapsed < 800,
      `textfile export tail-latency too slow: ${elapsed.toFixed(0)}ms (NFR <200ms in-process; <800ms allowed for cold spawn)`);
  } finally {
    rmSync(dataDir, { recursive: true, force: true });
  }
});

test('SC #14: missing CLAUDE_PLUGIN_DATA → silent exit 0', async () => {
  const r = await runHookWithEnv(HOOK_PATH, '{}', {
    VOYAGE_EXPORT_MODE: 'textfile',
    CLAUDE_PLUGIN_DATA: '',
  });
  assert.equal(r.code, 0);
});
