#!/usr/bin/env node
/**
 * propose-pattern.js — Feedback loop for the cross-project pattern registry.
 *
 * Use this when an agent applies a workaround, fix, or design choice that is
 * structurally reusable across projects. It compares the new lesson against
 * existing patterns and either proposes an update to an existing pattern or a
 * brand-new pattern file + manifest entry.
 *
 * Default mode is dry-run / preview. Pass --apply to write changes.
 *
 * Examples:
 *   node scripts/utils/propose-pattern.js \
 *     --task="n8n workflow sends LLM-generated text to LinkedIn" \
 *     --fix="JSON.stringify the post body and validate with JSON.parse before the HTTP Request node" \
 *     --projects="linkedin-automation" \
 *     --symptom="LinkedIn API returns malformed JSON payload errors" \
 *     --root-cause="LLM output contains unescaped quotes and newlines"
 *
 *   node scripts/utils/propose-pattern.js --apply --file=/tmp/proposed-pattern.json
 */

const fs = require('fs');
const path = require('path');

const WORKSPACE = '/home/jcbeasley/.openclaw/workspace';
const PATTERNS_DIR = path.join(WORKSPACE, 'patterns');
const MANIFEST_PATH = path.join(PATTERNS_DIR, 'patterns.json');

function slugify(name) {
  return name
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '');
}

function tokenSet(text) {
  return new Set(
    (text || '')
      .toLowerCase()
      .split(/[^a-z0-9_-]+/)
      .filter(t => t.length > 2)
  );
}

function jaccard(a, b) {
  if (a.size === 0 || b.size === 0) return 0;
  const intersection = new Set([...a].filter(x => b.has(x)));
  return intersection.size / (a.size + b.size - intersection.size);
}

function loadManifest() {
  try {
    return JSON.parse(fs.readFileSync(MANIFEST_PATH, 'utf8'));
  } catch (err) {
    return { version: new Date().toISOString().slice(0, 10), patterns: [] };
  }
}

function findBestMatch(taskText, fixText, manifest) {
  const queryTokens = new Set([...tokenSet(taskText), ...tokenSet(fixText)]);
  let best = { pattern: null, score: 0 };
  for (const pattern of manifest.patterns || []) {
    const patternTokens = new Set([
      ...tokenSet(pattern.name),
      ...tokenSet(pattern.id),
      ...(pattern.tags || []).flatMap(t => [...tokenSet(t)]),
      ...(pattern.affected_projects || []).flatMap(p => [...tokenSet(p)])
    ]);
    const score = jaccard(queryTokens, patternTokens);
    if (score > best.score) best = { pattern, score };
  }
  return best;
}

function buildPatternMarkdown(opts) {
  const related = (opts.related_patterns || [])
    .filter(id => id && id.trim())
    .map(id => `- \`${id}\``)
    .join('\n') || '- None yet.';

  return `# Pattern: ${opts.name}

## Symptom
${opts.symptom || 'TODO: describe the symptom'}

## Affected Projects
${(opts.projects || []).map(p => `- ${p}`).join('\n') || '- TODO'}

## Root Cause
${opts.root_cause || 'TODO: describe the root cause'}

## Standard Fix
${opts.fix || 'TODO: describe the standard fix'}

## When to Apply
${opts.when_to_apply || 'TODO: describe when to apply this pattern'}

## Verification
${opts.verification || 'TODO: describe how to verify the fix'}

## Related Patterns
${related}
`;
}

function buildProposal(argv) {
  const manifest = loadManifest();
  const match = findBestMatch(argv.task, argv.fix, manifest);
  const threshold = 0.15;

  if (match.pattern && match.score >= threshold) {
    // Propose update to existing pattern
    const updatedProjects = Array.from(new Set([
      ...(match.pattern.affected_projects || []),
      ...(argv.projects || [])
    ]));

    return {
      mode: 'update',
      score: match.score,
      existing: match.pattern,
      proposal: {
        id: match.pattern.id,
        name: match.pattern.name,
        affected_projects: updatedProjects,
        rationale: `Extend pattern "${match.pattern.id}" with newly observed project(s) and/or refined fix.`,
        additions: {
          affected_projects: argv.projects || []
        }
      }
    };
  }

  // Propose new pattern
  const name = argv.name || argv.task.split(/[.!?]/)[0].slice(0, 60);
  const id = argv.id || slugify(name);
  const tags = argv.tags || tokenSet(`${argv.task} ${argv.fix} ${argv.symptom} ${argv.root_cause}`);

  return {
    mode: 'create',
    score: match.score,
    nearest_existing: match.pattern,
    proposal: {
      id,
      name,
      file: `patterns/${id}.md`,
      tags: Array.from(tags),
      affected_projects: argv.projects || [],
      related_patterns: argv.related || [],
      markdown: buildPatternMarkdown({
        name,
        symptom: argv.symptom,
        projects: argv.projects || [],
        root_cause: argv.root_cause,
        fix: argv.fix,
        when_to_apply: argv.when_to_apply,
        verification: argv.verification,
        related_patterns: argv.related || []
      })
    }
  };
}

function printProposal(proposal) {
  if (proposal.mode === 'update') {
    console.log('\n=== PROPOSED PATTERN UPDATE (dry-run) ===\n');
    console.log(`Pattern:    ${proposal.existing.id}`);
    console.log(`Match score: ${(proposal.score * 100).toFixed(1)}%`);
    console.log(`Rationale:  ${proposal.proposal.rationale}`);
    console.log('\nExisting affected projects:');
    for (const p of proposal.existing.affected_projects || []) console.log(`  - ${p}`);
    console.log('\nProjects to add:');
    for (const p of proposal.proposal.additions.affected_projects) console.log(`  + ${p}`);
    console.log('\nRun with --apply to update patterns/patterns.json.');
  } else {
    console.log('\n=== PROPOSED NEW PATTERN (dry-run) ===\n');
    console.log(`ID:          ${proposal.proposal.id}`);
    console.log(`Name:        ${proposal.proposal.name}`);
    console.log(`File:        ${proposal.proposal.file}`);
    console.log(`Tags:        ${proposal.proposal.tags.join(', ')}`);
    console.log(`Projects:    ${proposal.proposal.affected_projects.join(', ') || '(none)'}`);
    console.log(`Match score: ${proposal.score > 0 ? (proposal.score * 100).toFixed(1) + '%' : 'none'}`);
    if (proposal.nearest_existing) {
      console.log(`Nearest existing pattern: ${proposal.nearest_existing.id} (${(proposal.score * 100).toFixed(1)}% match)`);
    }
    console.log('\n--- Markdown preview ---\n');
    console.log(proposal.proposal.markdown);
    console.log('\nRun with --apply to write the file and update patterns/patterns.json.');
  }
}

function applyProposal(proposal) {
  const manifest = loadManifest();

  if (proposal.mode === 'update') {
    const idx = manifest.patterns.findIndex(p => p.id === proposal.proposal.id);
    if (idx === -1) throw new Error(`Pattern ${proposal.proposal.id} not found in manifest`);
    manifest.patterns[idx].affected_projects = proposal.proposal.affected_projects;
    fs.writeFileSync(MANIFEST_PATH, JSON.stringify(manifest, null, 2) + '\n');
    console.log(`\nUpdated manifest: ${proposal.proposal.id} affected_projects`);
    return;
  }

  // Create new pattern
  const filePath = path.join(WORKSPACE, proposal.proposal.file);
  if (fs.existsSync(filePath)) {
    throw new Error(`Pattern file already exists: ${proposal.proposal.file}`);
  }
  fs.writeFileSync(filePath, proposal.proposal.markdown);

  const manifestEntry = {
    id: proposal.proposal.id,
    name: proposal.proposal.name,
    file: proposal.proposal.file,
    tags: proposal.proposal.tags,
    affected_projects: proposal.proposal.affected_projects,
    related_patterns: proposal.proposal.related_patterns
  };
  manifest.patterns.push(manifestEntry);
  fs.writeFileSync(MANIFEST_PATH, JSON.stringify(manifest, null, 2) + '\n');
  console.log(`\nCreated ${proposal.proposal.file}`);
  console.log(`Updated patterns/patterns.json`);
}

function parseArgv() {
  const argv = { _: [] };
  for (let i = 2; i < process.argv.length; i++) {
    const arg = process.argv[i];
    if (arg === '--apply') argv.apply = true;
    else if (arg === '--help' || arg === '-h') argv.help = true;
    else if (arg.startsWith('--')) {
      const key = arg.slice(2).replace(/-/g, '_');
      const next = process.argv[i + 1];
      if (next && !next.startsWith('--')) {
        if (['projects', 'tags', 'related'].includes(key)) {
          argv[key] = next.split(',').map(s => s.trim()).filter(Boolean);
        } else {
          argv[key] = next;
        }
        i++;
      } else {
        argv[key] = true;
      }
    } else {
      argv._.push(arg);
    }
  }
  return argv;
}

function main() {
  const argv = parseArgv();

  if (argv.help) {
    console.log(`Usage: node scripts/utils/propose-pattern.js [options]

Options:
  --task "..."          Description of the task/problem
  --fix "..."           The workaround or fix applied
  --projects p1,p2      Comma-separated affected project identifiers
  --symptom "..."       What the user/agent sees
  --root-cause "..."    Why it happens
  --when-to-apply "..." When to apply this pattern to new tasks
  --verification "..."  How to verify the fix
  --related p1,p2       Comma-separated related pattern IDs
  --name "..."          Override the generated pattern name
  --id "..."            Override the generated pattern ID
  --apply               Write files after review (default is dry-run)
  --file path.json      Load proposal inputs from JSON file
  -h, --help            Show this help
`);
    process.exit(0);
  }

  let inputs = argv;
  if (argv.file) {
    inputs = { ...JSON.parse(fs.readFileSync(argv.file, 'utf8')), ...argv };
  }

  if (!inputs.task && !inputs.fix && !inputs.symptom) {
    console.error('Error: at least one of --task, --fix, or --symptom is required.');
    process.exit(1);
  }

  const proposal = buildProposal(inputs);
  printProposal(proposal);

  if (argv.apply) {
    applyProposal(proposal);
    console.log('\nDone. Run `node architecture/pipeline.js "sample query"` to verify retrieval.');
  }
}

if (require.main === module) {
  main();
}

module.exports = { buildProposal, applyProposal, findBestMatch, loadManifest };