#!/usr/bin/env node
/**
 * 能力描述检查（任务 A1.6，依据 docs/spec/capability-description.md）。
 *
 * 约定：Provider 的每个能力写成一个 `*.capability.json`，放在 providers/<id>/ 下。
 * 七要素缺一即失败——模型选工具靠的就是这份描述（平台不另建意图识别器）。
 *
 * 用法：node scripts/check-capability-description.mjs [仓库根目录]
 */
import { existsSync } from 'node:fs';
import { readFile, readdir } from 'node:fs/promises';
import { join, relative, sep } from 'node:path';
import process from 'node:process';
import { pathToFileURL } from 'node:url';

const SCAN_DIRS = ['providers'];
const SKIP_DIRS = new Set(['node_modules', 'dist', '.git']);
const ID_PATTERN = /^[a-z0-9]+(\.[a-z0-9-]+)+$/;
const EFFECTS = new Set(['read', 'draft', 'write']);
const PURPOSE_MAX = 40;

async function collectCapabilityFiles(dir, acc = []) {
  let entries;
  try {
    entries = await readdir(dir, { withFileTypes: true });
  } catch {
    return acc;
  }
  for (const entry of entries) {
    const full = join(dir, entry.name);
    if (entry.isDirectory()) {
      if (SKIP_DIRS.has(entry.name)) continue;
      await collectCapabilityFiles(full, acc);
    } else if (entry.name.endsWith('.capability.json')) {
      acc.push(full);
    }
  }
  return acc;
}

const nonEmptyString = (value) => typeof value === 'string' && value.trim() !== '';

/** 校验单个能力描述对象，返回问题清单 */
export function validateCapability(description) {
  const problems = [];
  if (!nonEmptyString(description.id) || !ID_PATTERN.test(description.id)) {
    problems.push('id 必须形如 aps.schedule.preview（小写点分）');
  }
  if (!nonEmptyString(description.providerId)) problems.push('缺 providerId');
  if (!nonEmptyString(description.title)) problems.push('缺 title');
  if (!nonEmptyString(description.purpose)) {
    problems.push('缺 purpose（一句话用途）');
  } else if (description.purpose.length > PURPOSE_MAX) {
    problems.push(`purpose 超过 ${PURPOSE_MAX} 字`);
  }
  if (!nonEmptyString(description.whenNotToUse)) problems.push('缺 whenNotToUse（何时不用）');
  if (!EFFECTS.has(description.effect)) problems.push('effect 必须是 read / draft / write');
  if (typeof description.inputSchema !== 'object' || description.inputSchema === null) problems.push('缺 inputSchema');
  if (!Array.isArray(description.synonyms) || description.synonyms.filter(nonEmptyString).length === 0) {
    problems.push('synonyms 至少一条（业务黑话与同义词）');
  }
  const example = description.example;
  if (typeof example !== 'object' || example === null || !nonEmptyString(example.utterance) || !nonEmptyString(example.expects)) {
    problems.push('example 必须含 utterance 与 expects');
  }
  return problems;
}

export async function findCapabilityProblems(root) {
  const findings = [];
  for (const dir of SCAN_DIRS) {
    const abs = join(root, dir);
    if (!existsSync(abs)) continue;
    for (const file of await collectCapabilityFiles(abs)) {
      const rel = relative(root, file).split(sep).join('/');
      let parsed;
      try {
        parsed = JSON.parse(await readFile(file, 'utf8'));
      } catch (error) {
        findings.push({ file: rel, problems: [`JSON 解析失败：${error.message}`] });
        continue;
      }
      const problems = validateCapability(parsed);
      if (problems.length > 0) findings.push({ file: rel, problems });
    }
  }
  return findings;
}

async function main() {
  const root = process.cwd();
  const findings = await findCapabilityProblems(root);
  if (findings.length === 0) {
    console.log('能力描述检查通过（当前没有能力描述文件时为正常通过）');
    return;
  }
  console.error(`能力描述检查发现 ${findings.length} 个文件有问题：`);
  for (const finding of findings) console.error(`  ${finding.file}：${finding.problems.join('；')}`);
  process.exitCode = 1;
}

if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
  await main();
}