#!/usr/bin/env node
// user-prompt-context.mjs
// UserPromptSubmit hook for linkedin-thought-leadership plugin
//
// Two-tier keyword matching in user prompts:
//   Tier 1: Strong signals (slash commands, explicit phrases)
//   Tier 2: "linkedin" + intent word, excluding plugin dev phrases
//
// When matched, injects voice profile reference, recent posts,
// planned topic, weekly progress, and quality scorecard reminder.
//
// Exit codes:
//   0 - Always allow (informational hook)

import { readFileSync, existsSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const pluginRoot = join(__dirname, '..', '..');
const home = process.env.HOME || process.env.USERPROFILE || '';
const stateFile = join(home, '.claude', 'linkedin-thought-leadership.local.md');

// Read stdin JSON
let input;
try {
  input = JSON.parse(readFileSync(0, 'utf-8'));
} catch {
  process.stdout.write(JSON.stringify({ continue: true }));
  process.exit(0);
}

const userPrompt = (input.query ?? input.content ?? input.prompt ?? '').toLowerCase();

if (!userPrompt) {
  process.stdout.write(JSON.stringify({ continue: true }));
  process.exit(0);
}

// === Two-tier keyword matching ===
let isLinkedin = false;

// Tier 1: Strong signals
const strongSignals = [
  '/linkedin:post', '/linkedin:quick', '/linkedin:batch',
  '/linkedin:pipeline', '/linkedin:publish', '/linkedin:video',
  '/linkedin:multiplatform', '/linkedin:react', '/linkedin:summarize',
  'linkedin post', 'lag en post',
  'skriv en post', 'write a post', 'quick post', 'create post',
  'react to this', 'turn this article into',
];

for (const signal of strongSignals) {
  if (userPrompt.includes(signal)) {
    isLinkedin = true;
    break;
  }
}

// Tier 1.5: URL + intent — detect URLs with LinkedIn-relevant intent
if (!isLinkedin) {
  const urlPattern = /https?:\/\/\S+/;
  if (urlPattern.test(userPrompt)) {
    const urlIntentWords = ['react', 'post', 'share', 'write', 'comment', 'turn', 'create', 'linkedin'];
    for (const word of urlIntentWords) {
      if (userPrompt.includes(word)) {
        isLinkedin = true;
        break;
      }
    }
  }
}

// Tier 2: "linkedin" + intent word (excluding plugin dev phrases)
if (!isLinkedin && userPrompt.includes('linkedin')) {
  const intentWords = [
    'write', 'create', 'draft', 'publish', 'skriv', 'lag',
    'post', 'innlegg', 'article', 'artikkel',
  ];

  const devExclude = /(update|fix|change|modify|edit|refactor|debug|test).*(plugin|hook|script|command|agent|skill|config)/i;

  for (const intent of intentWords) {
    if (userPrompt.includes(intent)) {
      if (!devExclude.test(userPrompt)) {
        isLinkedin = true;
        break;
      }
    }
  }
}

if (!isLinkedin) {
  process.stdout.write(JSON.stringify({ continue: true }));
  process.exit(0);
}

// === Build context enrichment ===
let context = '**LinkedIn Context Enrichment (auto-injected):**\n\n';

// 1. Voice profile reference
const voiceFile = join(pluginRoot, 'assets', 'voice-samples', 'authentic-voice-samples.md');
if (existsSync(voiceFile)) {
  context += '**Voice Profile:** Read `assets/voice-samples/authentic-voice-samples.md` for tone matching.\n\n';
}

// 2-4. State file data
if (existsSync(stateFile)) {
  try {
    const stateContent = readFileSync(stateFile, 'utf-8');

    // Recent posts section
    const recentMatch = stateContent.match(/^## Recent Posts\s*\n([\s\S]*?)(?=^## |$)/m);
    if (recentMatch) {
      const recentLines = recentMatch[1]
        .split('\n')
        .filter(l => l.trim() && !l.startsWith('<!--'))
        .slice(0, 5);
      if (recentLines.length > 0) {
        context += `**Recent posts (avoid repetition):**\n${recentLines.join('\n')}\n\n`;
      }
    }

    // Next planned topic from YAML frontmatter
    const topicMatch = stateContent.match(/^next_planned_topic:\s*"?([^"\n]*)"?\s*$/m);
    if (topicMatch && topicMatch[1].trim()) {
      context += `**Planned next topic:** ${topicMatch[1].trim()}\n\n`;
    }

    // Weekly progress from YAML frontmatter
    const postsMatch = stateContent.match(/^posts_this_week:\s*(\d+)/m);
    const goalMatch = stateContent.match(/^weekly_goal:\s*(\d+)/m);
    if (postsMatch && goalMatch) {
      context += `**Weekly progress:** ${postsMatch[1]}/${goalMatch[1]} posts this week.\n\n`;
    }
  } catch {
    // State file read error — skip enrichment
  }
}

// 5.5 URL detection hint
const urlMatch = (input.query ?? input.content ?? input.prompt ?? '').match(/https?:\/\/\S+/);
if (urlMatch) {
  context += '**URL detected:** Consider using /linkedin:react for this URL.\n\n';
}

// 5. Quality scorecard reminder
context += '**Remember:** Use `assets/checklists/quality-scorecard.md` before finalizing.\n';

process.stdout.write(JSON.stringify({ continue: true, systemMessage: context }));
process.exit(0);