const express = require('express');
const router = express.Router();
const db = require('../db');
const auth = require('../middleware/auth');

router.use(auth);

const DEFAULT_CATEGORIES = ['旗舰版PP', '旗舰版ATS', '标品ATS', '标品PP', '国际版ATS'];
const DEFAULT_MODULES = ['组织接口', '职位职务接口', '人事接口', '假勤接口', '薪酬接口', '绩效接口', '自定义分组接口', 'BI 报表接口'];

async function getSetting(key, defaults) {
    const [[row]] = await db.query('SELECT value FROM settings WHERE `key` = ?', [key]);
    if (!row) return defaults;
    try {
        const extra = JSON.parse(row.value);
        // 合并：默认值在前，自定义值去重追加
        return [...defaults, ...extra.filter(v => !defaults.includes(v))];
    } catch { return defaults; }
}

// 获取所有设置
router.get('/', async (req, res) => {
    try {
        const [categories, modules] = await Promise.all([
            getSetting('categories', DEFAULT_CATEGORIES),
            getSetting('modules', DEFAULT_MODULES),
        ]);
        res.json({
            categories,
            modules,
            defaultCategories: DEFAULT_CATEGORIES,
            defaultModules: DEFAULT_MODULES,
        });
    } catch (err) {
        res.status(500).json({ error: err.message });
    }
});

// 更新分类（仅保存自定义项，默认项不入库）
router.put('/categories', async (req, res) => {
    try {
        const { items } = req.body; // 完整列表（含默认+自定义）
        const extra = items.filter(v => !DEFAULT_CATEGORIES.includes(v));
        await db.query(
            'INSERT INTO settings (`key`, value) VALUES (?, ?) ON DUPLICATE KEY UPDATE value = ?',
            ['categories', JSON.stringify(extra), JSON.stringify(extra)]
        );
        res.json({ message: 'OK' });
    } catch (err) {
        res.status(500).json({ error: err.message });
    }
});

// 更新业务模块
router.put('/modules', async (req, res) => {
    try {
        const { items } = req.body;
        const extra = items.filter(v => !DEFAULT_MODULES.includes(v));
        await db.query(
            'INSERT INTO settings (`key`, value) VALUES (?, ?) ON DUPLICATE KEY UPDATE value = ?',
            ['modules', JSON.stringify(extra), JSON.stringify(extra)]
        );
        res.json({ message: 'OK' });
    } catch (err) {
        res.status(500).json({ error: err.message });
    }
});

module.exports = router;
module.exports.DEFAULT_CATEGORIES = DEFAULT_CATEGORIES;
module.exports.DEFAULT_MODULES = DEFAULT_MODULES;