#!/usr/bin/env node
const fs = require('fs');
const path = require('path');
const { spawnSync } = require('child_process');

const ROOT = __dirname;
const MIN_NODE_MAJOR = 18;
const PACKAGE_NAMES = new Set([
  'claude-code-voc-intelligence',
  '@gangvy/claude-code-voc-intelligence'
]);

function parseArgs(argv) {
  const opts = {
    check: false,
    smoke: false,
    skipInstall: false,
    help: false,
    noNext: false
  };
  for (const token of argv) {
    if (token === '--check') opts.check = true;
    else if (token === '--smoke') opts.smoke = true;
    else if (token === '--skip-install') opts.skipInstall = true;
    else if (token === '--no-next') opts.noNext = true;
    else if (token === '--help' || token === '-h') opts.help = true;
  }
  return opts;
}

function usage() {
  return [
    'Claude Code VOC Intelligence installer',
    '',
    'Usage:',
    '  node install.js',
    '  node install.js --smoke',
    '  node install.js --check',
    '',
    'Options:',
    '  --check          Check files and environment only',
    '  --smoke          Run sample/preference/MCP smoke checks',
    '  --skip-install   Skip npm install',
    '  --no-next        Do not print next-step instructions',
    '  --help, -h       Show help'
  ].join('\n');
}

function run(command, args, options = {}) {
  const useCmd = process.platform === 'win32' && command === 'npm';
  const executable = useCmd ? 'cmd.exe' : command;
  const finalArgs = useCmd ? ['/d', '/s', '/c', 'npm', ...args] : args;
  const child = spawnSync(executable, finalArgs, {
    cwd: options.cwd || ROOT,
    encoding: 'utf8',
    stdio: options.stdio || 'inherit',
    maxBuffer: 1024 * 1024 * 100
  });
  if (child.status !== 0) {
    const detail = child.error ? `: ${child.error.message}` : '';
    throw new Error(`${command} ${args.join(' ')} failed with exit ${child.status}${detail}`);
  }
  return child;
}

function readJson(relativePath) {
  return JSON.parse(fs.readFileSync(path.join(ROOT, relativePath), 'utf8'));
}

function writeMcpConfig(rootDir = ROOT) {
  const mcpConfigPath = path.join(rootDir, '.mcp.json');
  const serverPath = path.join(rootDir, 'mcp', 'src', 'server.js');
  const mcpConfig = {
    mcpServers: {
      voc: {
        command: 'node',
        args: [serverPath],
        cwd: rootDir
      }
    }
  };
  fs.writeFileSync(mcpConfigPath, `${JSON.stringify(mcpConfig, null, 2)}\n`, 'utf8');
}

function assertFile(relativePath) {
  const absolute = path.join(ROOT, relativePath);
  if (!fs.existsSync(absolute)) {
    throw new Error(`Missing required file: ${relativePath}`);
  }
}

function checkNodeVersion() {
  const major = Number(process.versions.node.split('.')[0]);
  if (!Number.isFinite(major) || major < MIN_NODE_MAJOR) {
    throw new Error(`Node.js ${MIN_NODE_MAJOR}+ is required. Current version: ${process.version}`);
  }
}

function checkFiles() {
  [
    'package.json',
    '.claude-plugin/plugin.json',
    '.mcp.json',
    'skill-package-manifest.json',
    'skills/xiaohongshu-trend-intelligence/SKILL.md',
    'skills/douyin-trend-intelligence/SKILL.md',
    'skills/voc-issue-pool/SKILL.md',
    'skills/voc-problem-deep-dive/SKILL.md',
    'skills/voc-content-plan/SKILL.md',
    'skills/voc-speaking-script/SKILL.md',
    'skills/voc-competitor-map/SKILL.md',
    'skills/voc-business-workflow/SKILL.md',
    'mcp/src/server.js'
  ].forEach(assertFile);

  const packageJson = readJson('package.json');
  const pluginJson = readJson('.claude-plugin/plugin.json');
  const mcpJson = readJson('.mcp.json');
  if (!PACKAGE_NAMES.has(packageJson.name)) {
    throw new Error('package.json name is invalid');
  }
  if (pluginJson.name !== 'voc-intelligence') {
    throw new Error('.claude-plugin/plugin.json name is invalid');
  }
  if (!mcpJson.mcpServers || !(mcpJson.mcpServers.voc || mcpJson.mcpServers['voc-intelligence'])) {
    throw new Error('.mcp.json does not configure the VOC MCP server');
  }
}

function checkClaudeCommand() {
  const command = process.platform === 'win32' ? 'where' : 'which';
  const child = spawnSync(command, ['claude'], {
    cwd: ROOT,
    encoding: 'utf8',
    stdio: 'pipe'
  });
  return child.status === 0;
}

function printNextSteps({ claudeAvailable }) {
  const loadCommand = `claude --plugin-dir "${ROOT}"`;
  console.log('');
  console.log('Install check complete.');
  console.log('');
  console.log('Next step:');
  console.log(`  1. Start Claude Code with: ${loadCommand}`);
  console.log('  2. In Claude Code, say:');
  console.log('     帮我看一下南昌餐饮最近顾客在关心什么，并告诉我先改哪里、下周发什么。');
  console.log('  或者说：');
  console.log('     帮我做一份家装全屋定制行业的小红书趋势情报。');
  console.log('     先用演示样例跑通流程，不要真实采集。');
  console.log('     在聊天里给我第一轮样本观察和待确认问题。');
  console.log('  或者说：');
  console.log('     帮我做一份家装全屋定制行业的抖音趋势情报。');
  console.log('     先用演示样例跑通流程，不要真实采集。');
  console.log('     在聊天里给我第一轮样本观察和待确认问题。');
  console.log('');
  if (!claudeAvailable) {
    console.log('Tip: the current terminal did not detect the claude command.');
    console.log('If Claude Code is installed elsewhere, run the command above in that terminal.');
    console.log('');
  }
  console.log('Live collection requires a Xiaohongshu or Douyin/VOC token. Sample mode works without a token.');
}

function main() {
  const opts = parseArgs(process.argv.slice(2));
  if (opts.help) {
    console.log(usage());
    return;
  }

  console.log('');
  console.log('Claude Code VOC Intelligence install check');
  console.log('==========================================');
  console.log('');

  checkNodeVersion();
  checkFiles();
  writeMcpConfig(ROOT);
  console.log(`Node.js: ${process.version}`);
  console.log('Required files: OK');

  if (!opts.check && !opts.skipInstall) {
    console.log('');
    console.log('Installing dependencies...');
    run('npm', ['install', '--omit=dev', '--ignore-scripts']);
  }

  if (opts.smoke) {
    console.log('');
    console.log('Running sample/preference/MCP smoke checks...');
    run(process.execPath, ['scripts/smoke-package.js']);
  }

  if (!opts.noNext) {
    printNextSteps({ claudeAvailable: checkClaudeCommand() });
  }
}

try {
  main();
} catch (error) {
  console.error('');
  console.error(`Install failed: ${error.message}`);
  process.exit(1);
}