import { execFileSync } from 'node:child_process';
import { existsSync, mkdirSync, writeFileSync } from 'node:fs';
import path from 'node:path';

import { getFeatureDirectory, validateFeatureId } from './feature-record.mjs';

const [featureId, slug] = process.argv.slice(2);
const repositoryRoot = process.cwd();

if (!featureId || !slug || !validateFeatureId(featureId)) {
  throw new Error('用法：npm run governance:start -- <功能编号> <英文短名称>');
}

const featureDirectory = getFeatureDirectory(repositoryRoot, featureId, slug);
const gitnexusDirectory = path.join(featureDirectory, 'gitnexus');
const beforeReport = path.join(gitnexusDirectory, 'before.md');

if (existsSync(beforeReport)) {
  throw new Error(`开发前报告已存在，为保护历史不会覆盖：${beforeReport}`);
}

mkdirSync(gitnexusDirectory, { recursive: true });

/**
 * 开发门禁直接调用参数数组，不拼接 shell 字符串，避免功能名称被解释为命令。
 * stdio 使用 pipe 是为了把同一次运行的真实输出固化到功能档案中。
 */
function run(command, args) {
  return execFileSync(command, args, {
    cwd: repositoryRoot,
    encoding: 'utf8',
    stdio: ['ignore', 'pipe', 'pipe'],
  }).trim();
}

const branch = run('git', ['branch', '--show-current']) || '(尚无分支)';
const commit = run('git', ['rev-parse', '--verify', 'HEAD']).slice(0, 12);
const worktree = run('git', ['status', '--short']) || '(干净)';

run('npx', ['gitnexus', 'analyze']);
const gitnexusStatus = run('npx', ['gitnexus', 'status']);
const createdAt = new Intl.DateTimeFormat('zh-CN', {
  dateStyle: 'long',
  timeStyle: 'long',
  timeZone: 'Asia/Shanghai',
}).format(new Date());

writeFileSync(
  beforeReport,
  `# GitNexus 开发前基线\n\n` +
    `- 功能编号：${featureId}\n` +
    `- 记录时间：${createdAt}\n` +
    `- 分支：${branch}\n` +
    `- 基线提交：${commit}\n\n` +
    `## 工作区\n\n\`\`\`text\n${worktree}\n\`\`\`\n\n` +
    `## GitNexus 状态\n\n\`\`\`text\n${gitnexusStatus}\n\`\`\`\n\n` +
    `## 后续人工分析\n\n` +
    `在修改代码前，将 GitNexus query、context、impact 的结论写入 ` +
    `\`gitnexus/impact-plan.md\`。高风险结果必须先获得用户确认。\n`,
  'utf8',
);

process.stdout.write(`已创建开发前基线：${beforeReport}\n`);