try {
    const { Pool, Client } = require('pg')
    const request = require('superagent')
    const path = require('path')
    const fs = require("fs");

    const pool = new Pool({
        host: '10.8.30.32',
        port: 5432,
        user: 'postgres',
        password: '123',
        database: 'highways4good',
    })

    function getDistance (lat1, lon1, lat2, lon2) {
        var R = 6371000; // 半径 of the earth in meters    
        var dLat = deg2rad(lat2 - lat1);  // deg2rad below    
        var dLon = deg2rad(lon2 - lon1);
        var a =
            Math.sin(dLat / 2) * Math.sin(dLat / 2) +
            Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) *
            Math.sin(dLon / 2) * Math.sin(dLon / 2)
            ;
        var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        var d = R * c; // Distance in meters    
        return d;
    }

    function deg2rad (deg) {
        return deg * (Math.PI / 180)
    }

    // 两个经纬度    
    let coord1 = { latitude: 31.2304, longitude: 121.4737 }; // 上海    
    let coord2 = { latitude: 30.5685, longitude: 114.3055 }; // 武汉    

    // let distance = getDistance(coord1.latitude, coord1.longitude, coord2.latitude, coord2.longitude);   

    const fun = async () => {
        // note: we don't try/catch this because if connecting throws an exception
        // we don't need to dispose of the client (it will be undefined)
        const client = await pool.connect()
        try {
            await client.query('BEGIN')
            console.log(`开始`);

            // 遍历南昌县所有村
            let pageNum = 1
            let continueSearch = true
            for (; continueSearch;) {
                console.log(`查询第${pageNum}页`);
                const res = await request.get(`https://restapi.amap.com/v5/place/text?key=21c2d970e1646bb9a795900dd00093ce&keywords=%E6%9D%91%E5%A7%94%E4%BC%9A%7C%E6%9D%91%E6%B0%91%E5%A7%94%E5%91%98%E4%BC%9A&types=130106&region=360121&citylimit=true&page_size=25&page_num=${pageNum}&extensions=all`)

                // console.log(res.body);
                const data = res.body
                console.log(`查得 ${data.pois.length} 条`);
                if (data.count == 0) {
                    continueSearch = false
                    break;
                } else {
                    pageNum++
                }
                for await (let p of data.pois) {
                    if (p.name.includes('村委会') || p.name.includes('村民委员会')) {
                        let vName = p.name.replace('村委会', '').replace('村民委员会', '').replace(/\(.*?\)/g, '')

                        if (vName.includes('乡')) {
                            let townKeyIndex = vName.indexOf('乡')
                            if (townKeyIndex >= 0) {
                                vName = vName.substring(townKeyIndex + 1)
                            }
                        }
                        if (vName.includes('镇')) {
                            let townKeyIndex = vName.indexOf('镇')
                            if (townKeyIndex >= 0) {
                                vName = vName.substring(townKeyIndex + 1)
                            }
                        }

                        if (!vName.endsWith('村')) {
                            vName = vName + '村'
                        }

                        console.log(`${vName}`);
                        let locationArr = p.location.split(',')

                        // 查询镇名是否存在
                        const existRes = await client.query(
                            `SELECT * FROM village WHERE name=$1`,
                            [vName]
                        )

                        if (existRes.rowCount == 0) {

                        } else {
                            let existV = existRes[0]
                            await client.query(
                                `UPDATE village SET longitude=$1, latitude=$2 WHERE id=$3`,
                                [locationArr[0], locationArr[1], existV.id]
                            )
                        }
                    }
                }
            }

            const allVillagesRes = await client.query(
                `SELECT * FROM village`
            )
            const allVillages = allVillagesRes.rows
            for (let v of allVillages) {
                if (!v.longitude || !v.latitude) {
                    continue
                }
                for (let vv of allVillages) {
                    if (
                        v.id != vv.id
                        // 只计算一个乡镇内的村
                        && v.township_code == vv.township_code
                    ) {
                        if (!vv.longitude || !vv.latitude) {
                            continue
                        }
                        let distance = getDistance(v.latitude, v.longitude, vv.latitude, vv.longitude)
                        console.log(`${v.name} 与 ${vv.name} 的距离为 ${distance} 米`);

                        distance = Math.round(distance)
                        const existRes = await client.query(
                            `SELECT * FROM village_distance WHERE origin_village=$1 AND calc_village=$2`,
                            [v.id, vv.id]
                        )
                        if (existRes.rowCount == 0) {
                            await client.query(
                                `INSERT INTO village_distance (origin_village, calc_village, distance) VALUES ($1, $2, $3)`,
                                [v.id, vv.id, distance]
                            )
                        } else {
                            await client.query(
                                `UPDATE village_distance SET distance=$1 WHERE origin_village=$2 AND calc_village=$`
                                , [distance, v.id, vv.id]
                            )
                        }
                    }
                }
            }

            // await client.query('ROLLBACK')
            await client.query('COMMIT')
            console.log('执行完毕~')
        } catch (e) {
            await client.query('ROLLBACK')
            console.log('执行错误~')
            throw e
        } finally {
            client.release();
        }
    }

    fun()
} catch (error) {
    console.error(error)
}