const fs = require('fs');
const xml2js = require('xml2js');

const PLUGIN_ID = "cordova-plugin-semsx-launcher";
const gradlePath = './platforms/android/app/build.gradle'; // cordova-android@7+ path

let deferral;

function addSupport() {
    let defaultArgs = {
        kotlin_version: '\text.kotlin_version = "latest.integration"\n\t',
        kotlin_android: 'apply plugin: "kotlin-android"',
        classpath: ' \t\tclasspath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"'
    };
    const pluginXML = fs.readFileSync('./plugins/' + PLUGIN_ID + '/plugin.xml').toString();
    const gradle = fs.readFileSync(gradlePath).toString();
    let text = gradle;
    const parser = new xml2js.Parser();
    parser.parseString(pluginXML, (error, config) => {
        if (error) return;
        if (!config.plugin.hasOwnProperty('platform')) return;
        for (let x of config.plugin.platform)
            if (x['$'].name === 'android') {
                if (x['$'].hasOwnProperty('kotlin')) defaultArgs.kotlin_version = `\text.kotlin_version = "${x['$'].kotlin}"\n\t`;
                if (x.hasOwnProperty('apply-plugin')) defaultArgs.apply_plugin = x['apply-plugin'];
                break;
            }
        if (!gradle.match(/ext.kotlin_version/g)) append(defaultArgs.kotlin_version, /buildscript(\s*)\{\s*/g);
        if (!gradle.match(/kotlin-gradle-plugin/g)) append(defaultArgs.classpath, /classpath\s+(['"])[\w.:]+(['"])/g);
        if (!gradle.match(/apply\s+plugin(\s*:\s*)(['"])kotlin-android(['"])/g)) append(defaultArgs.kotlin_android);
        if (defaultArgs.apply_plugin)
            for (let x of defaultArgs.apply_plugin) {
                const reg = new RegExp(`apply\\s+plugin(\\s*:\\s*)(['"])${x}(['"])`, 'g');
                if (!gradle.match(reg)) append(`apply plugin: "${x}"`);
            }
    });

    function append(edit, reg) {
        if (reg === undefined) reg = /com.android.application['"]/g;
        const pos = text.search(reg);
        const len = text.match(reg)[0].length;
        const header = text.substring(0, pos + len);
        const footer = text.substring(pos + len);
        text = header + '\n' + edit + footer;
    }

    fs.writeFileSync(gradlePath, text);
}
module.exports = function (ctx) {
    try {
        deferral = ctx.requireCordovaModule('q').defer();
        addSupport();
        deferral.resolve();
    } catch (e) {
        let msg = e.toString();
        console.dir(e);
        deferral.reject(msg);
        return deferral.promise;
    }
};