// tests/kb-update/test-detection-schedule.test.mjs
// Spor C / C1 (Sesjon 21): opt-in session-anchored detection.
//
// The detection layer (poll/report/discover/skill-lifecycle) is PURE node and
// never contacts Anthropic, so it is OUTSIDE the ToS surface (Consumer Terms
// §3.7 targets automated access to "our Services"). This suite proves:
//   (A) the opt-in config defaults OFF and parses safely,
//   (B) shouldRunDetection gates the hook's background spawn (disabled => never),
//   (C) the skill-lifecycle one-liner surfaced at session start,
//   (D) the STRUCTURAL ToS guarantee: run-detection.mjs is Claude-free — it
//       only ever spawns `node` on the known detection scripts, never `claude`.

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { mkdtempSync, rmSync, mkdirSync, writeFileSync, readFileSync, existsSync, readdirSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import {
  DEFAULT_SCHEDULE_CONFIG,
  DETECTION_STEPS,
  parseScheduleConfig,
  serializeScheduleConfig,
  loadScheduleConfig,
  shouldRunDetection,
  summarizeSkillLifecycle,
  daysSinceLastPoll,
} from '../../scripts/kb-update/lib/detection-schedule.mjs';
import { writeScheduleConfig } from '../../scripts/kb-update/write-schedule-config.mjs';
import { resolveConfigPath, resolveUserDataDir } from '../../scripts/kb-update/lib/user-data.mjs';

const __dirname = dirname(fileURLToPath(import.meta.url));
const PLUGIN_ROOT = join(__dirname, '..', '..');

// ===========================================================================
// (A) parseScheduleConfig / loadScheduleConfig — opt-in, default OFF
// ===========================================================================

test('DEFAULT_SCHEDULE_CONFIG — opt-in: disabled by default', () => {
  assert.equal(DEFAULT_SCHEDULE_CONFIG.enabled, false, 'detection is OFF until the user opts in');
  assert.equal(DEFAULT_SCHEDULE_CONFIG.interval_days, 7);
  assert.equal(DEFAULT_SCHEDULE_CONFIG.include_skill_lifecycle, true);
});

test('parseScheduleConfig — empty/absent text returns the OFF default', () => {
  assert.deepEqual(parseScheduleConfig(''), DEFAULT_SCHEDULE_CONFIG);
  assert.deepEqual(parseScheduleConfig('# just some markdown, no frontmatter'), DEFAULT_SCHEDULE_CONFIG);
});

test('parseScheduleConfig — reads an enabled block with overrides', () => {
  const text = [
    '---',
    'scheduled_detection:',
    '  enabled: true',
    '  interval_days: 3',
    '  include_skill_lifecycle: false',
    '---',
    '',
    '# notes',
  ].join('\n');
  const cfg = parseScheduleConfig(text);
  assert.equal(cfg.enabled, true);
  assert.equal(cfg.interval_days, 3);
  assert.equal(cfg.include_skill_lifecycle, false);
});

test('parseScheduleConfig — partial block keeps defaults for missing keys', () => {
  const cfg = parseScheduleConfig('scheduled_detection:\n  enabled: true\n');
  assert.equal(cfg.enabled, true);
  assert.equal(cfg.interval_days, 7, 'unspecified key falls back to default');
  assert.equal(cfg.include_skill_lifecycle, true);
});

test('parseScheduleConfig — malformed input never throws, falls back to OFF', () => {
  assert.equal(parseScheduleConfig('scheduled_detection: : : nonsense').enabled, false);
  assert.equal(parseScheduleConfig('scheduled_detection:\n  enabled: maybe\n').enabled, false,
    'a non-boolean enabled is treated as OFF');
});

// --- Tier 2 (launchd) cadence: os_scheduler_cadence (Sesjon 24) ---

test('DEFAULT_SCHEDULE_CONFIG — os_scheduler_cadence defaults to daily', () => {
  assert.equal(DEFAULT_SCHEDULE_CONFIG.os_scheduler_cadence, 'daily');
});

test('parseScheduleConfig — reads os_scheduler_cadence: interval', () => {
  const cfg = parseScheduleConfig('scheduled_detection:\n  os_scheduler_cadence: interval\n');
  assert.equal(cfg.os_scheduler_cadence, 'interval');
});

test('parseScheduleConfig — unknown/garbage cadence falls back to daily', () => {
  assert.equal(parseScheduleConfig('scheduled_detection:\n  os_scheduler_cadence: weekly\n').os_scheduler_cadence, 'daily');
  assert.equal(parseScheduleConfig('scheduled_detection:\n  enabled: true\n').os_scheduler_cadence, 'daily',
    'unspecified cadence => daily default');
});

// ===========================================================================
// (A2) C2.3 — serializeScheduleConfig + writeScheduleConfig (onboarding writes
//      the opt-in config; parseScheduleConfig round-trips it — acceptance K5)
// ===========================================================================

test('serializeScheduleConfig — produces a parseable scheduled_detection: block', () => {
  const text = serializeScheduleConfig({ enabled: true, os_scheduler_cadence: 'interval' });
  assert.match(text, /^---/, 'frontmatter-fenced config file');
  assert.match(text, /scheduled_detection:/);
  assert.match(text, /\n {2}enabled: true/);
  assert.match(text, /\n {2}os_scheduler_cadence: interval/);
});

test('serializeScheduleConfig — round-trips through parseScheduleConfig (daily)', () => {
  const cfg = parseScheduleConfig(serializeScheduleConfig({ enabled: true, os_scheduler_cadence: 'daily' }));
  assert.equal(cfg.enabled, true);
  assert.equal(cfg.os_scheduler_cadence, 'daily');
  assert.equal(cfg.interval_days, 7, 'unspecified key serialized at its default');
  assert.equal(cfg.include_skill_lifecycle, true);
});

test('serializeScheduleConfig — round-trips interval cadence + disabled', () => {
  const cfg = parseScheduleConfig(serializeScheduleConfig({ enabled: false, os_scheduler_cadence: 'interval' }));
  assert.equal(cfg.enabled, false);
  assert.equal(cfg.os_scheduler_cadence, 'interval');
});

test('serializeScheduleConfig — preserves a non-default interval_days through the round-trip', () => {
  const cfg = parseScheduleConfig(serializeScheduleConfig({ enabled: true, interval_days: 14, os_scheduler_cadence: 'daily' }));
  assert.equal(cfg.interval_days, 14);
});

test('serializeScheduleConfig — garbage cadence is normalized to daily', () => {
  const cfg = parseScheduleConfig(serializeScheduleConfig({ enabled: true, os_scheduler_cadence: 'weekly' }));
  assert.equal(cfg.os_scheduler_cadence, 'daily');
});

test('writeScheduleConfig — writes user config that parseScheduleConfig reads back (K5)', () => {
  const home = mkdtempSync(join(tmpdir(), 'home-'));
  try {
    const { configPath } = writeScheduleConfig({ enabled: true, cadence: 'interval', home });
    assert.equal(configPath, resolveConfigPath(home), 'writes to the user-owned config path');
    const cfg = parseScheduleConfig(readFileSync(configPath, 'utf8'));
    assert.equal(cfg.enabled, true);
    assert.equal(cfg.os_scheduler_cadence, 'interval');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('writeScheduleConfig — coerces string flags (CLI args arrive as strings)', () => {
  const home = mkdtempSync(join(tmpdir(), 'home-'));
  try {
    writeScheduleConfig({ enabled: 'true', cadence: 'daily', home });
    const cfg = parseScheduleConfig(readFileSync(resolveConfigPath(home), 'utf8'));
    assert.equal(cfg.enabled, true, '"true" string => boolean true');
    assert.equal(cfg.os_scheduler_cadence, 'daily');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('writeScheduleConfig — merge preserves pre-existing keys (interval_days) it does not own', () => {
  const home = mkdtempSync(join(tmpdir(), 'home-'));
  try {
    mkdirSync(resolveUserDataDir(home), { recursive: true });
    writeFileSync(
      resolveConfigPath(home),
      'scheduled_detection:\n  enabled: true\n  interval_days: 21\n  include_skill_lifecycle: false\n',
    );
    writeScheduleConfig({ enabled: false, cadence: 'interval', home });
    const cfg = parseScheduleConfig(readFileSync(resolveConfigPath(home), 'utf8'));
    assert.equal(cfg.enabled, false, 'onboarding-owned key updated');
    assert.equal(cfg.os_scheduler_cadence, 'interval', 'onboarding-owned key updated');
    assert.equal(cfg.interval_days, 21, 'non-owned key preserved across the rewrite');
    assert.equal(cfg.include_skill_lifecycle, false, 'non-owned key preserved across the rewrite');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('writeScheduleConfig — backs up an existing config before overwriting it', () => {
  const home = mkdtempSync(join(tmpdir(), 'home-'));
  try {
    writeScheduleConfig({ enabled: true, cadence: 'daily', home }); // first write: nothing to back up
    const backupRoot = join(resolveUserDataDir(home), '.backups');
    assert.equal(existsSync(backupRoot), false, 'no backup created on first write (no prior file)');
    writeScheduleConfig({ enabled: false, cadence: 'interval', home }); // second write: prior file exists
    assert.equal(existsSync(backupRoot), true, 'prior config backed up before the second write');
    const stamps = readdirSync(backupRoot);
    assert.equal(stamps.length, 1, 'exactly one backup generation');
    const backedUp = parseScheduleConfig(
      readFileSync(join(backupRoot, stamps[0], 'ms-ai-architect.local.md'), 'utf8'),
    );
    assert.equal(backedUp.enabled, true, 'backup holds the PRIOR (pre-overwrite) config');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('writeScheduleConfig — loadScheduleConfig picks up what onboarding wrote (end-to-end)', () => {
  const root = mkdtempSync(join(tmpdir(), 'sched-'));
  const home = mkdtempSync(join(tmpdir(), 'home-'));
  try {
    writeScheduleConfig({ enabled: true, cadence: 'interval', home });
    const cfg = loadScheduleConfig(root, home);
    assert.equal(cfg.enabled, true, 'the scheduler loads the onboarding-written user config');
    assert.equal(cfg.os_scheduler_cadence, 'interval');
  } finally {
    rmSync(root, { recursive: true, force: true });
    rmSync(home, { recursive: true, force: true });
  }
});

test('daysSinceLastPoll — Infinity when report missing or last_poll absent/invalid', () => {
  const now = Date.UTC(2026, 5, 21);
  assert.equal(daysSinceLastPoll(null, now), Infinity);
  assert.equal(daysSinceLastPoll({}, now), Infinity);
  assert.equal(daysSinceLastPoll({ last_poll: 'not-a-date' }, now), Infinity);
});

test('daysSinceLastPoll — computes whole days since last_poll', () => {
  const now = Date.UTC(2026, 5, 21, 0, 0, 0);
  const tenDaysAgo = new Date(Date.UTC(2026, 5, 11, 0, 0, 0)).toISOString();
  assert.equal(daysSinceLastPoll({ last_poll: tenDaysAgo }, now), 10);
});

test('loadScheduleConfig — no config (neither user nor plugin-root) => OFF default', () => {
  const root = mkdtempSync(join(tmpdir(), 'sched-'));
  const home = mkdtempSync(join(tmpdir(), 'home-')); // empty home: no user-owned config
  try {
    assert.deepEqual(loadScheduleConfig(root, home), DEFAULT_SCHEDULE_CONFIG);
  } finally {
    rmSync(root, { recursive: true, force: true });
    rmSync(home, { recursive: true, force: true });
  }
});

test('loadScheduleConfig — reads plugin-root ms-ai-architect.local.md when no user config (fallback)', () => {
  const root = mkdtempSync(join(tmpdir(), 'sched-'));
  const home = mkdtempSync(join(tmpdir(), 'home-'));
  try {
    writeFileSync(
      join(root, 'ms-ai-architect.local.md'),
      '---\nscheduled_detection:\n  enabled: true\n  interval_days: 14\n---\n',
    );
    const cfg = loadScheduleConfig(root, home);
    assert.equal(cfg.enabled, true);
    assert.equal(cfg.interval_days, 14);
  } finally {
    rmSync(root, { recursive: true, force: true });
    rmSync(home, { recursive: true, force: true });
  }
});

// --- C2.1: user-owned config wins; plugin-root is the backward-compat fallback ---

function writeUserConfig(home, text) {
  mkdirSync(resolveUserDataDir(home), { recursive: true });
  writeFileSync(resolveConfigPath(home), text);
}

test('loadScheduleConfig — user-owned config is read even when pluginRoot has none (K2 survival)', () => {
  const root = mkdtempSync(join(tmpdir(), 'sched-')); // fresh reinstall: plugin root has no config
  const home = mkdtempSync(join(tmpdir(), 'home-'));
  try {
    writeUserConfig(home, '---\nscheduled_detection:\n  enabled: true\n  interval_days: 5\n---\n');
    const cfg = loadScheduleConfig(root, home);
    assert.equal(cfg.enabled, true, 'config survives in the user dir, independent of pluginRoot');
    assert.equal(cfg.interval_days, 5);
  } finally {
    rmSync(root, { recursive: true, force: true });
    rmSync(home, { recursive: true, force: true });
  }
});

test('loadScheduleConfig — user config wins over a plugin-root config', () => {
  const root = mkdtempSync(join(tmpdir(), 'sched-'));
  const home = mkdtempSync(join(tmpdir(), 'home-'));
  try {
    writeFileSync(join(root, 'ms-ai-architect.local.md'), 'scheduled_detection:\n  enabled: true\n  interval_days: 99\n');
    writeUserConfig(home, 'scheduled_detection:\n  enabled: true\n  interval_days: 3\n');
    const cfg = loadScheduleConfig(root, home);
    assert.equal(cfg.interval_days, 3, 'user path takes precedence over plugin-root');
  } finally {
    rmSync(root, { recursive: true, force: true });
    rmSync(home, { recursive: true, force: true });
  }
});

// ===========================================================================
// (B) shouldRunDetection — the hook's background-spawn gate
// ===========================================================================

test('shouldRunDetection — DISABLED (default) never runs, even when stale', () => {
  const r = shouldRunDetection(DEFAULT_SCHEDULE_CONFIG, 999);
  assert.equal(r.run, false);
  assert.match(r.reason, /opt-in|disabled/i);
});

test('shouldRunDetection — enabled + stale (days >= interval) runs', () => {
  const cfg = { enabled: true, interval_days: 7, include_skill_lifecycle: true };
  assert.equal(shouldRunDetection(cfg, 7).run, true, 'boundary: exactly interval => run');
  assert.equal(shouldRunDetection(cfg, 30).run, true);
});

test('shouldRunDetection — enabled + fresh (days < interval) does NOT run', () => {
  const cfg = { enabled: true, interval_days: 7, include_skill_lifecycle: true };
  const r = shouldRunDetection(cfg, 3);
  assert.equal(r.run, false);
  assert.match(r.reason, /fresh|fersk/i);
});

test('shouldRunDetection — force overrides a disabled config', () => {
  assert.equal(shouldRunDetection(DEFAULT_SCHEDULE_CONFIG, 0, { force: true }).run, true);
});

// ===========================================================================
// (C) summarizeSkillLifecycle — one-liner surfaced at session start
// ===========================================================================

const REPORT_WITH_SIGNALS = {
  overlap: { pairs: [{ pair: ['ms-ai-engineering', 'ms-ai-infrastructure'], combined: 7.4167 }, { pair: ['a', 'b'], combined: 2.1 }] },
  coverage: { summary: { gaps: 1, thin: 2 }, gaps: [{ category: 'x' }] },
  bloat: { summary: { bloatCandidates: [], staleCandidates: ['ms-ai-governance'] } },
};

test('summarizeSkillLifecycle — surfaces overlap-over-threshold, gaps, thin, stale', () => {
  const s = summarizeSkillLifecycle(REPORT_WITH_SIGNALS, { threshold: 7.0 });
  assert.match(s, /Skill-signaler:/);
  assert.match(s, /1 overlapp-par/, 'only the combined>=7 pair counts');
  assert.match(s, /1 (gap|dekningshull)/);
  assert.match(s, /2 tynne/);
  assert.match(s, /1 stale/);
});

test('summarizeSkillLifecycle — no signals returns null (nothing to surface)', () => {
  const empty = {
    overlap: { pairs: [{ pair: ['a', 'b'], combined: 1.0 }] },
    coverage: { summary: { gaps: 0, thin: 0 } },
    bloat: { summary: { bloatCandidates: [], staleCandidates: [] } },
  };
  assert.equal(summarizeSkillLifecycle(empty, { threshold: 7.0 }), null);
});

test('summarizeSkillLifecycle — tolerates a missing/partial report shape', () => {
  assert.equal(summarizeSkillLifecycle({}, { threshold: 7.0 }), null);
  assert.equal(summarizeSkillLifecycle(null, { threshold: 7.0 }), null);
});

// ===========================================================================
// (D) STRUCTURAL ToS GUARANTEE — detection is Claude-free
// ===========================================================================

const KNOWN_DETECTION_SCRIPTS = new Set([
  'poll-sitemaps.mjs',
  'report-changes.mjs',
  'discover-new-urls.mjs',
  'detect-skill-lifecycle.mjs',
  'build-registry.mjs',
]);

test('DETECTION_STEPS — only the known pure-node detection scripts, never claude', () => {
  assert.ok(DETECTION_STEPS.length >= 4);
  for (const step of DETECTION_STEPS) {
    assert.ok(step.script.endsWith('.mjs'), `${step.script} must be a node script`);
    assert.ok(KNOWN_DETECTION_SCRIPTS.has(step.script), `${step.script} must be an allow-listed detection script`);
    assert.ok(['kb-update', 'kb-eval'].includes(step.dir), `${step.dir} unexpected`);
  }
  // skill-lifecycle detection must be present and flagged so config can exclude it
  assert.ok(DETECTION_STEPS.some((s) => s.script === 'detect-skill-lifecycle.mjs' && s.skillLifecycle === true));
});

test('run-detection.mjs source — spawns node, NEVER claude (the ToS boundary made structural)', () => {
  const src = readFileSync(join(PLUGIN_ROOT, 'scripts', 'kb-update', 'run-detection.mjs'), 'utf8');
  // It must run node on local scripts...
  assert.match(src, /execFileSync\(\s*'node'|spawn\(\s*'node'/, 'detection runs `node`');
  // ...and must NEVER invoke the claude binary. Strip comments first so the
  // Claude-free CONTRACT can be documented in prose without tripping the guard:
  // the guarantee is "no claude INVOCATION", not "the word never appears".
  const code = src.replace(/\/\/[^\n]*/g, '').replace(/\/\*[\s\S]*?\*\//g, '');
  assert.doesNotMatch(code, /(execFileSync|spawn|exec|execSync)\(\s*['"`]claude['"`]/i, 'never spawns claude');
  assert.doesNotMatch(code, /['"`]claude['"`]/i, 'no claude binary referenced in code');
  assert.doesNotMatch(code, /anthropic/i, 'code must not call Anthropic');
});