const express = require('express')
const router = express.Router()
const {getDB} = require('../database')

/**
 * @swagger
 * tags:
 *   name: Regions
 *   description: 地区数据API
 */

/**
 * @swagger
 * components:
 *   schemas:
 *     Region:
 *       type: object
 *       properties:
 *         code:
 *           type: string
 *           description: 地区编码
 *         name:
 *           type: string
 *           description: 地区名称
 *     ZhejiangRegion:
 *       type: object
 *       properties:
 *         id:
 *           type: integer
 *           description: 地区ID
 *         city_name:
 *           type: string
 *           description: 城市名称
 *         district_name:
 *           type: string
 *           description: 区县名称
 *         region_code:
 *           type: string
 *           description: 地区编码
 *         is_available:
 *           type: integer
 *           description: 是否可用(1:可用 0:不可用)
 */

/**
 * @swagger
 * /regions/zhejiang:
 *   get:
 *     summary: 获取浙江省所有地区数据
 *     tags: [Regions]
 *     responses:
 *       200:
 *         description: 成功获取浙江省地区数据
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 success:
 *                   type: boolean
 *                   example: true
 *                 data:
 *                   type: array
 *                   items:
 *                     $ref: '#/components/schemas/ZhejiangRegion'
 *                 message:
 *                   type: string
 *                   example: 获取地区数据成功
 *       500:
 *         description: 服务器错误
 */
router.get('/zhejiang', async (req, res) => {
    try {
        const query = `
            SELECT id, city_name, district_name, region_code, is_available
            FROM zhejiang_regions
            WHERE is_available = 1
            ORDER BY city_name, district_name
        `

        const [rows] = await getDB().execute(query)

        res.json({
            success: true,
            data: rows,
            message: '获取地区数据成功'
        })
    } catch (error) {
        console.error('获取浙江省地区数据失败:', error)
        res.status(500).json({
            success: false,
            message: '获取地区数据失败'
        })
    }
})

/**
 * @swagger
 * /regions/provinces:
 *   get:
 *     summary: 获取所有省份
 *     tags: [Regions]
 *     responses:
 *       200:
 *         description: 成功获取省份列表
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 success:
 *                   type: boolean
 *                   example: true
 *                 data:
 *                   type: array
 *                   items:
 *                     $ref: '#/components/schemas/Region'
 *       500:
 *         description: 服务器错误
 */
router.get('/provinces', async (req, res) => {
    try {
        // 按level分组数据
        const regionsByLevel = {
            1: [], // 省份
            2: [], // 城市
            3: []  // 区县
        };
        if (!global.provinces) {
            // 一次性获取所有区域数据（省、市、区县）
            const [allRegions] = await getDB().execute(
                `SELECT code, name as label, level, parent_code
                 FROM china_regions
                 WHERE level <= 3
                 ORDER BY level, code`
            );


            // 创建code到region的映射，便于快速查找
            const regionMap = {};

            // 分组并建立映射
            allRegions.forEach(region => {
                region.children = []; // 初始化children数组
                regionsByLevel[region.level].push(region);
                regionMap[region.code] = region;
            });

            // 构建层级关系：先处理区县到城市的关系
            regionsByLevel[3].forEach(district => {
                const parentCity = regionMap[district.parent_code];
                if (parentCity) {
                    parentCity.children.push(district);
                }
            });

            // 再处理城市到省份的关系
            regionsByLevel[2].forEach(city => {
                const parentProvince = regionMap[city.parent_code];
                if (parentProvince) {
                    parentProvince.children.push(city);
                }
            });
            global.provinces = regionsByLevel[1];
        }else {
            // console.log('1111')
            regionsByLevel[1] = global.provinces;
        }


        // 返回省份数据（已包含完整的层级结构）
        res.json({
            success: true,
            data: regionsByLevel[1]
        });
    } catch (error) {
        console.error('获取省份列表错误:', error);
        res.status(500).json({message: '获取省份列表失败'});
    }
});

/**
 * @swagger
 * /regions/cities/{provinceCode}:
 *   get:
 *     summary: 根据省份代码获取城市列表
 *     tags: [Regions]
 *     parameters:
 *       - in: path
 *         name: provinceCode
 *         required: true
 *         schema:
 *           type: string
 *         description: 省份代码
 *     responses:
 *       200:
 *         description: 成功获取城市列表
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 success:
 *                   type: boolean
 *                   example: true
 *                 data:
 *                   type: array
 *                   items:
 *                     $ref: '#/components/schemas/Region'
 *       500:
 *         description: 服务器错误
 */
router.get('/cities/:provinceCode', async (req, res) => {
    try {
        const provinceCode = req.params.provinceCode;

        const [cities] = await getDB().execute(
            `SELECT code, name
             FROM china_regions
             WHERE level = 2
               AND parent_code = ?
             ORDER BY code`,
            [provinceCode]
        );

        res.json({
            success: true,
            data: cities
        });
    } catch (error) {
        console.error('获取城市列表错误:', error);
        res.status(500).json({message: '获取城市列表失败'});
    }
});

/**
 * @swagger
 * /regions/districts/{cityCode}:
 *   get:
 *     summary: 根据城市代码获取区县列表
 *     tags: [Regions]
 *     parameters:
 *       - in: path
 *         name: cityCode
 *         required: true
 *         schema:
 *           type: string
 *         description: 城市代码
 *     responses:
 *       200:
 *         description: 成功获取区县列表
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 success:
 *                   type: boolean
 *                   example: true
 *                 data:
 *                   type: array
 *                   items:
 *                     $ref: '#/components/schemas/Region'
 *       500:
 *         description: 服务器错误
 */
router.get('/districts/:cityCode', async (req, res) => {
    try {
        const cityCode = req.params.cityCode;

        const [districts] = await getDB().execute(
            `SELECT code, name
             FROM china_regions
             WHERE level = 3
               AND parent_code = ?
             ORDER BY code`,
            [cityCode]
        );

        res.json({
            success: true,
            data: districts
        });
    } catch (error) {
        console.error('获取区县列表错误:', error);
        res.status(500).json({message: '获取区县列表失败'});
    }
});

/**
 * @swagger
 * /regions/path/{regionCode}:
 *   get:
 *     summary: 根据区域代码获取完整路径（省-市-区）
 *     tags: [Regions]
 *     parameters:
 *       - in: path
 *         name: regionCode
 *         required: true
 *         schema:
 *           type: string
 *         description: 区域代码
 *     responses:
 *       200:
 *         description: 成功获取区域完整路径
 *         content:
 *           application/json:
 *             schema:
 *               type: object
 *               properties:
 *                 success:
 *                   type: boolean
 *                   example: true
 *                 data:
 *                   type: object
 *                   properties:
 *                     province:
 *                       $ref: '#/components/schemas/Region'
 *                     city:
 *                       $ref: '#/components/schemas/Region'
 *                     district:
 *                       $ref: '#/components/schemas/Region'
 *       404:
 *         description: 区域不存在
 *       500:
 *         description: 服务器错误
 */
router.get('/path/:regionCode', async (req, res) => {
    try {
        const regionCode = req.params.regionCode;

        // 获取当前区域信息
        const [currentRegion] = await getDB().execute(
            'SELECT code, name, level, parent_code FROM china_regions WHERE code = ?',
            [regionCode]
        );

        if (currentRegion.length === 0) {
            return res.status(404).json({message: '区域不存在'});
        }

        const region = currentRegion[0];
        const path = [region];

        // 递归获取父级区域
        let parentCode = region.parent_code;
        while (parentCode) {
            const [parentRegion] = await getDB().execute(
                'SELECT code, name, level, parent_code FROM china_regions WHERE code = ? AND status = "active"',
                [parentCode]
            );

            if (parentRegion.length > 0) {
                path.unshift(parentRegion[0]);
                parentCode = parentRegion[0].parent_code;
            } else {
                break;
            }
        }

        res.json({
            success: true,
            data: {
                path,
                province: path.find(r => r.level === 1) || null,
                city: path.find(r => r.level === 2) || null,
                district: path.find(r => r.level === 3) || null
            }
        });
    } catch (error) {
        console.error('获取区域路径错误:', error);
        res.status(500).json({message: '获取区域路径失败'});
    }
});

// 搜索区域（支持模糊搜索）
router.get('/search', async (req, res) => {
    try {
        const {keyword, level} = req.query;

        if (!keyword || keyword.trim() === '') {
            return res.status(400).json({message: '搜索关键词不能为空'});
        }

        let sql = `SELECT code, name, level, parent_code
                   FROM china_regions
                   WHERE name LIKE ?`;
        const params = [`%${keyword.trim()}%`];

        if (level) {
            sql += ' AND level = ?';
            params.push(parseInt(level));
        }

        sql += ' ORDER BY level, code LIMIT 50';

        const [regions] = await getDB().execute(sql, params);

        // 为每个搜索结果获取完整路径
        const results = [];
        for (const region of regions) {
            const path = [region];
            let parentCode = region.parent_code;

            while (parentCode) {
                const [parentRegion] = await getDB().execute(
                    'SELECT code, name, level, parent_code FROM china_regions WHERE code = ? AND status = "active"',
                    [parentCode]
                );

                if (parentRegion.length > 0) {
                    path.unshift(parentRegion[0]);
                    parentCode = parentRegion[0].parent_code;
                } else {
                    break;
                }
            }

            results.push({
                ...region,
                path,
                fullName: path.map(r => r.name).join(' - ')
            });
        }

        res.json({
            success: true,
            data: results
        });
    } catch (error) {
        console.error('搜索区域错误:', error);
        res.status(500).json({message: '搜索区域失败'});
    }
});

module.exports = router