const fs = require('fs');
const path = require('path');
const regexDevRemove = /(\#dev\-begin.*?\#dev\-end)\n/mgs;
const regexInclude = /(#include\s+(\S+))/mgs;
const regexVer = /(###\s+version:\s+)([0-9]+\.[0-9]+\.[0-9]+)/mgs;
const regexScrVer = /(SCRIPT_VERSION\s*=\s*\")([0-9]+\.[0-9]+\.[0-9]+)(\"\s+#auto-update)/mgs;
const regexDate = /(SCRIPT_BUILD_TIME\s*=\s*\")([0-9.]+)(\"\s+#auto-update)/mgs;

const srcDir = fs.realpathSync(__dirname + path.sep + '..' + path.sep + 'src')
const baseDir = fs.realpathSync(__dirname + path.sep + '..')
const manifest = require(baseDir + path.sep + 'package.json')

console.log(`Version from manifest: ${manifest.version}`)
const event = new Date();
const dateFormated = event.toISOString().substr(0, 10).replaceAll('-', '.');

function toLocalDateStr(date = new Date()) {
    const pad = n => String(Math.floor(Math.abs(n))).padStart(2, '0');
    return date.getFullYear() + '.' +
        pad(date.getMonth() + 1) + '.' +
        pad(date.getDate()) + ' ' +
        pad(date.getHours()) + ':' +
        pad(date.getMinutes());
}

try {
    let data = fs.readFileSync(srcDir + path.sep + 'setup.sh', 'utf8');
    data = data.replace(/###autogen-warning/mgs,
        "# This file is automatically generated. Do not modify it directly!\n"
        + "# Instead, modify the source files in the src directory and run the build script!\n#\n"
        + "# Build time: " + toLocalDateStr(event) + "\n"
    );
    while (data.includes('#include') || data.includes('#dev-begin')) {
        data = data.replace(regexDevRemove, '');
        data = data.replace(regexInclude, (_, _2, fileName) => {
            const included = fs.readFileSync(srcDir + path.sep + fileName, 'utf8');
            return included + "\n\n"
        });

        data = data.replace(regexVer, '$1' + manifest.version);
        data = data.replace(regexScrVer, '$1' + manifest.version + '$3');
        data = data.replace(regexDate, '$1' + dateFormated + '$3');
    }
    fs.writeFileSync(baseDir + path.sep + 'install.sh', data);
} catch (err) {
    console.error(err);
}

fs.writeFileSync(baseDir + path.sep + 'updated', event.toISOString());