# All files restful_regions.js

26.32% Statements 15/57
15.38% Branches 4/26
25% Functions 1/4
26.32% Lines 15/57

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     /*       */
    "use strict";

    const getRegion = async (
        res     ,
        dbConn     ,
        country         ,
        region
    ) => {
        try {
            let sqlQuery = "";
            if (country == null) {
                sqlQuery = `
                    SELECT rr.*
                    FROM regions rr
                    JOIN countries cc
                    ON cc.countryCode=rr.countryCode
                    ORDER BY cc.countryCode, rr.regionCode
            `;
            } else if (region == null) {
                sqlQuery = `
                    SELECT 1
                    FROM countries
                    WHERE countryCode="${country}"
                `;

                const countries = await dbConn.query(sqlQuery);
                if (countries.length === 0) {
                    return res.status(404).send("Country not found");
                }

                sqlQuery = `
                    SELECT rr.*
                    FROM regions rr
                    JOIN countries cc
                    ON cc.countryCode=rr.countryCode
                    WHERE rr.countryCode="${country}"
                    ORDER BY rr.regionCode
                `;
            } else {
                sqlQuery = `
                    SELECT rr.*
                    FROM regions rr
                    JOIN countries cc
                    ON cc.countryCode=rr.countryCode
                    WHERE rr.countryCode="${country}"
                    AND rr.regionCode="${region}"
                `;
            }

            const regions = await dbConn.query(sqlQuery);
            if (regions.length > 0 || region === null) {
                res
                    .status(200)
                    .set("Content-Type", "application/json")
                    .send(JSON.stringify(regions));
            } else {
                res.status(404).send("Not found");
            }
        } catch (e) {
            res.status(500).send("Server error");
        }
    };

    const deleteRegion = async (
        res     ,
        dbConn     ,
        country        ,
        region
    ) => {
        try {
            const sqlCities = `
                SELECT 1 FROM cities
                WHERE countryCode="${country}"
                AND regionCode="${region}"
                LIMIT 1
            `;
            const cities = await dbConn.query(sqlCities);
            if (cities.length > 0) {
                res.status(405).send("Cannot delete a region with cities");
            } else {
                const deleteRegion = `
                    DELETE FROM regions
                    WHERE countryCode="${country}"
                    AND regionCode="${region}"
                `;

                const result = await dbConn.query(deleteRegion);
                if (result.info.affectedRows > 0) {
                    res.status(204).send();
                } else {
                    res.status(404).send("Region not found");
                }
            }
        } catch (e) {
            res.status(500).send("Server error");
        }
    };

    const postRegion = async (
        res     ,
        dbConn     ,
        country        ,
        name
    ) => {
        if (!name) {
            return res.status(400).send("Missing name");
        }

        try {
            const sqlCountry = `
                SELECT 1
                FROM countries
                WHERE countryCode="${country}"
            `;
            const countries = await dbConn.query(sqlCountry);
            if (countries.length === 0) {
                res.status(403).send("Country must exist");
            }

            const sqlGetId = `
                SELECT MAX(CAST(regionCode AS INTEGER)) AS maxr
                FROM regions
                WHERE countryCode="${country}"
            `;
            const regions = await dbConn.query(sqlGetId);
            const newId =
                regions.length === 0 ? 1 : 1 + Number(regions[0].maxr);

            const sqlAddRegion = `
                INSERT INTO regions SET
                countryCode="${country}",
                regionCode="${newId}",
                regionName="${name}"
            `;

            const result = await dbConn.query(sqlAddRegion);
            if (result.info.affectedRows > 0) {
                res
                    .status(201)
                    .header("Location", `/regions/${country}/${newId}`)
                    .send("Region created");
            } else {
                res.status(409).send("Region not created");
            }
        } catch (e) {
            res.status(500).send("Server error");
        }
    };

    const putRegion = async (
        res     ,
        dbConn     ,
        country        ,
        region        ,
        name
    ) => {
        if (!name) {
            return res.status(400).send("Missing name");
        }

        try {
            const sqlUpdateRegion = `
                UPDATE regions
                SET regionName="${name}"
                WHERE countryCode="${country}"
                AND regionCode="${region}"
            `;

            const result = await dbConn.query(sqlUpdateRegion);

            if (result.info.affectedRows > 0) {
                res.status(204).send();
            } else {
                res.status(409).send("Region not updated");
            }
        } catch (e) {
            res.status(500).send("Server error");
        }
    };

    module.exports = { getRegion, deleteRegion, postRegion, putRegion };