#!/usr/bin/env node
/**
 * manifest-compact.js · Phase α 冲刺 3 · 2026-04-25
 * Weekly maintenance CLI (not a hook).
 *   node scripts/manifest-compact.js             # dry-run
 *   node scripts/manifest-compact.js --execute   # apply
 */
'use strict';
const fs = require('fs');
const path = require('path');

const ROOT = path.resolve(__dirname, '..');
const PIPELINE_DIR = path.join(ROOT, 'ai-delivery-pipeline');
const MANIFEST = path.join(PIPELINE_DIR, 'manifest.jsonl');
const STAGING_DIR = path.join(PIPELINE_DIR, 'staging');
const QUARANTINE_DIR = path.join(PIPELINE_DIR, 'quarantine');
const DELIVERY_DIR = path.join(PIPELINE_DIR, 'delivery');
const ARCHIVE_DIR = path.join(DELIVERY_DIR, 'archive');
const TTL_DAYS = 7;
const EXECUTE = process.argv.includes('--execute');

function readManifestLines() {
  if (!fs.existsSync(MANIFEST)) return { parsed: [], corrupt: 0, total: 0 };
  const raw = fs.readFileSync(MANIFEST, 'utf8');
  const lines = raw.split('\n').filter(Boolean);
  const parsed = []; let corrupt = 0;
  for (const L of lines) {
    try { parsed.push(JSON.parse(L)); } catch { corrupt++; }
  }
  return { parsed, corrupt, total: lines.length };
}
function aggregate(entries) {
  const groups = new Map();
  for (const e of entries) {
    if (!e.hash || !e.originalPath) continue;
    const key = (e.sessionId || '-') + '|' + e.hash + '|' + e.originalPath;
    const cur = groups.get(key) || { events: [], final: null };
    cur.events.push(e); cur.final = e;
    groups.set(key, cur);
  }
  return groups;
}
function partitionByAge(entries) {
  const cutoff = Date.now() - TTL_DAYS * 86400 * 1000;
  const recent = [], old = [];
  for (const e of entries) {
    const ts = e.ts ? new Date(e.ts).getTime() : Date.now();
    (ts < cutoff ? old : recent).push(e);
  }
  return { recent, old };
}
function walkDir(dir) {
  if (!fs.existsSync(dir)) return [];
  const out = [];
  const walk = (d) => {
    for (const name of fs.readdirSync(d)) {
      const p = path.join(d, name);
      let s; try { s = fs.statSync(p); } catch { continue; }
      if (s.isDirectory()) walk(p); else out.push({ path: p, mtime: s.mtimeMs, size: s.size });
    }
  };
  walk(dir);
  return out;
}
function cleanOldQuarantine(dryRun) {
  const cutoff = Date.now() - TTL_DAYS * 86400 * 1000;
  const victims = walkDir(QUARANTINE_DIR).filter(f => f.mtime < cutoff);
  const totalSize = victims.reduce((a, f) => a + f.size, 0);
  if (!dryRun) for (const v of victims) { try { fs.unlinkSync(v.path); } catch (_) {} }
  return { count: victims.length, bytes: totalSize };
}
function cleanOrphanStaging(validKeys, dryRun) {
  const files = walkDir(STAGING_DIR);
  const victims = [];
  for (const f of files) {
    const parts = f.path.replace(STAGING_DIR, '').split(/[\\\/]/).filter(Boolean);
    if (parts.length < 3) continue;
    const hash = parts[1];
    const hasKey = [...validKeys].some(k => k.includes('|' + hash + '|'));
    if (!hasKey) victims.push(f);
  }
  const totalSize = victims.reduce((a, f) => a + f.size, 0);
  if (!dryRun) for (const v of victims) { try { fs.unlinkSync(v.path); } catch (_) {} }
  return { count: victims.length, bytes: totalSize };
}
function archiveOld(oldEntries, dryRun) {
  if (oldEntries.length === 0) return { archived: 0, path: null };
  fs.mkdirSync(ARCHIVE_DIR, { recursive: true });
  const today = new Date().toISOString().slice(0, 10);
  const archivePath = path.join(ARCHIVE_DIR, 'manifest-' + today + '.jsonl');
  if (!dryRun) {
    const body = oldEntries.map(e => JSON.stringify(e)).join('\n') + '\n';
    fs.appendFileSync(archivePath, body, 'utf8');
  }
  return { archived: oldEntries.length, path: archivePath };
}
function rewriteManifest(recentEntries, dryRun) {
  if (dryRun) return;
  const tmp = MANIFEST + '.tmp.' + process.pid;
  const body = recentEntries.map(e => JSON.stringify(e)).join('\n') + (recentEntries.length ? '\n' : '');
  fs.writeFileSync(tmp, body, 'utf8');
  fs.renameSync(tmp, MANIFEST);
}
function fmtBytes(b) {
  if (b < 1024) return b + ' B';
  if (b < 1024 * 1024) return (b / 1024).toFixed(1) + ' KB';
  return (b / 1024 / 1024).toFixed(1) + ' MB';
}
function main() {
  if (!fs.existsSync(MANIFEST)) { console.log('[manifest-compact] no manifest, skip'); process.exit(0); }
  const { parsed, corrupt, total } = readManifestLines();
  console.log('[manifest-compact] entries:', parsed.length, '(total', total + ', corrupt', corrupt + ')');
  const { recent, old } = partitionByAge(parsed);
  const groups = aggregate(parsed);
  const validKeys = new Set(groups.keys());
  const qR = cleanOldQuarantine(!EXECUTE);
  const sR = cleanOrphanStaging(validKeys, !EXECUTE);
  const aR = archiveOld(old, !EXECUTE);
  console.log('\n[' + (EXECUTE ? 'EXECUTE' : 'DRY-RUN') + '] summary:');
  console.log('  groups:', groups.size);
  console.log('  recent kept:', recent.length);
  console.log('  archived:', aR.archived, '->', aR.path || '(none)');
  console.log('  quarantine cleaned:', qR.count, '(' + fmtBytes(qR.bytes) + ')');
  console.log('  staging orphans cleaned:', sR.count, '(' + fmtBytes(sR.bytes) + ')');
  if (EXECUTE) {
    rewriteManifest(recent, false);
    console.log('\n[EXECUTE] manifest.jsonl rewritten (' + recent.length + ' entries)');
  } else {
    console.log('\n[DRY-RUN] add --execute to apply');
  }
}
try { main(); } catch (e) { console.error('[manifest-compact] crash:', e.message); process.exit(1); }