#!/usr/bin/env node
/**
 * Sync agent instructions from WDS repo to Design Space.
 * Reads sync-manifest.json to determine what to sync.
 *
 * Usage:
 *   node sync-from-manifest.js                     # sync all stable
 *   node sync-from-manifest.js --channel beta       # sync beta channel
 *   node sync-from-manifest.js --agent saga         # sync one agent
 *   node sync-from-manifest.js --dry-run            # preview only
 *
 * Environment:
 *   DESIGN_SPACE_URL       Supabase project URL
 *   DESIGN_SPACE_ANON_KEY  Supabase anon key
 *   WDS_ROOT               Path to WDS repo (default: auto-detect)
 */

import { readFileSync, existsSync } from 'fs';
import { join, basename, dirname } from 'path';
import { fileURLToPath } from 'url';
import { createHash } from 'crypto';

const __dirname = dirname(fileURLToPath(import.meta.url));
const REPO_ROOT = process.env.WDS_ROOT || join(__dirname, '..');

// --- Load env ---
for (const envPath of [join(REPO_ROOT, '.env'), join(__dirname, '../../design-space/.env')]) {
  if (existsSync(envPath)) {
    for (const line of readFileSync(envPath, 'utf8').replace(/\r/g, '').split('\n')) {
      const match = line.match(/^([^#=]+)=(.*)$/);
      if (match && !process.env[match[1].trim()]) {
        process.env[match[1].trim()] = match[2].trim();
      }
    }
  }
}

const SUPABASE_URL = process.env.DESIGN_SPACE_URL;
const SUPABASE_KEY = process.env.DESIGN_SPACE_ANON_KEY;

if (!SUPABASE_URL || !SUPABASE_KEY) {
  console.error('Missing DESIGN_SPACE_URL or DESIGN_SPACE_ANON_KEY');
  process.exit(1);
}

// --- Args ---
const DRY_RUN = process.argv.includes('--dry-run');
const CHANNEL = (() => {
  const idx = process.argv.indexOf('--channel');
  return idx !== -1 ? process.argv[idx + 1] : 'stable';
})();
const AGENT_FILTER = (() => {
  const idx = process.argv.indexOf('--agent');
  return idx !== -1 ? process.argv[idx + 1] : null;
})();

// --- Load manifest ---
const manifestPath = join(REPO_ROOT, 'src/sync-manifest.json');
if (!existsSync(manifestPath)) {
  console.error(`Manifest not found: ${manifestPath}`);
  process.exit(1);
}
const manifest = JSON.parse(readFileSync(manifestPath, 'utf8'));
console.log(`WDS Instruction Sync v${manifest.version}`);
console.log(`Repo: ${REPO_ROOT}`);
console.log(`Channel: ${CHANNEL}`);
if (AGENT_FILTER) console.log(`Agent filter: ${AGENT_FILTER}`);
console.log();

// --- Filter and collect ---
const filtered = manifest.instructions.filter(i => {
  if (i.channel !== CHANNEL) return false;
  if (AGENT_FILTER && i.agent !== AGENT_FILTER && i.agent !== '*') return false;
  return true;
});

console.log(`${filtered.length} instructions to sync`);
console.log();

// --- Process ---
let uploaded = 0;
let skipped = 0;
let failed = 0;

for (const instr of filtered) {
  const filePath = join(REPO_ROOT, instr.file);
  if (!existsSync(filePath)) {
    console.warn(`  SKIP (not found): ${instr.file}`);
    skipped++;
    continue;
  }

  const content = readFileSync(filePath, 'utf8');
  const hash = createHash('sha256').update(content).digest('hex').substring(0, 12);
  const name = basename(instr.file);

  if (DRY_RUN) {
    console.log(`  [${instr.agent}] ${instr.type}/${name} (${content.length} chars, hash: ${hash})`);
    continue;
  }

  try {
    // Check if this exact version exists (by source_file + hash in metadata)
    const checkRes = await fetch(`${SUPABASE_URL}/rest/v1/design_space?select=id,metadata&category=eq.agent_instruction&source_file=eq.${instr.file.replace(/\//g, '%2F')}&limit=1`, {
      headers: {
        'Authorization': `Bearer ${SUPABASE_KEY}`,
        'apikey': SUPABASE_KEY,
      },
    });
    const existing = await checkRes.json();

    if (existing?.[0]?.metadata?.hash === hash) {
      skipped++;
      continue;
    }

    // Delete old version if exists
    if (existing?.[0]?.id) {
      await fetch(`${SUPABASE_URL}/rest/v1/design_space?id=eq.${existing[0].id}`, {
        method: 'DELETE',
        headers: {
          'Authorization': `Bearer ${SUPABASE_KEY}`,
          'apikey': SUPABASE_KEY,
        },
      });
    }

    // Upload new version
    const res = await fetch(`${SUPABASE_URL}/functions/v1/capture-design-space`, {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${SUPABASE_KEY}`,
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        content,
        category: 'agent_instruction',
        project: 'wds',
        designer: instr.agent,
        topics: [instr.type, instr.agent, `channel:${instr.channel}`],
        components: [name],
        source: 'sync-manifest',
        source_file: instr.file,
        metadata: {
          agent: instr.agent,
          type: instr.type,
          name,
          layer: 'framework',
          channel: instr.channel,
          hash,
          manifest_version: manifest.version,
        },
      }),
    });

    if (res.ok) {
      uploaded++;
      console.log(`  OK [${instr.agent}] ${instr.type}/${name}`);
    } else {
      failed++;
      console.error(`  FAIL [${instr.agent}] ${name}: ${await res.text()}`);
    }
  } catch (err) {
    failed++;
    console.error(`  FAIL [${instr.agent}] ${name}: ${err.message}`);
  }
}

console.log();
console.log(`Done: ${uploaded} uploaded, ${skipped} unchanged, ${failed} failed`);
if (failed > 0) process.exit(1);