let path = require('path');
const fs = require('fs');
const { createReadStream, createWriteStream } = require('fs');
const { createGzip } = require('zlib');
const chalk = require('chalk');

let distPath = path.normalize(__dirname + '/../dist/');
let srcPath = path.normalize(__dirname + '/../assets/');
let headerPath = path.normalize(
    __dirname + '/../../esp3d/src/modules/http/favicon.h'
);

const convertToC = (filepath) => {
    console.log(chalk.yellow('Converting bin to text file'));
    //Cleaning files
    if (fs.existsSync(distPath + 'out.tmp')) fs.rmSync(distPath + 'out.tmp');
    if (fs.existsSync(distPath + 'favicon.h'))
        fs.rmSync(distPath + 'favicon.h');

    const data = new Uint8Array(fs.readFileSync(filepath, { flag: 'r' }));
    console.log('data size is ', data.length);
    let out = '#define favicon_size  ' + data.length + '\n';
    out += 'const unsigned char favicon[' + data.length + '] PROGMEM = {\n   ';
    let nb = 0;
    data.forEach((byte, index) => {
        out +=
            ' 0x' +
            (byte.toString(16).length == 1 ? '0' : '') +
            byte.toString(16);
        if (index < data.length - 1) out += ',';
        if (nb == 15) {
            out += '\n   ';
            nb = 0;
        } else {
            nb++;
        }
    });

    out += '\n};\n';
    fs.writeFileSync(distPath + 'out.tmp', out);

    //Check conversion
    if (fs.existsSync(distPath + 'out.tmp')) {
        console.log(chalk.green('[ok]'));
    } else {
        console.log(chalk.red('[error]Conversion failed'));
        return;
    }

    //Format header file
    console.log(chalk.yellow('Building header'));
    fs.writeFileSync(
        distPath + 'favicon.h',
        fs.readFileSync(srcPath + 'header.txt')
    );
    let bin2cfile = fs.readFileSync(distPath + 'out.tmp').toString();
    fs.appendFileSync(distPath + 'favicon.h', bin2cfile);
    fs.appendFileSync(
        distPath + 'favicon.h',
        fs.readFileSync(srcPath + 'footer.txt')
    );

    //Check format result
    if (fs.existsSync(distPath + 'favicon.h')) {
        console.log(chalk.green('[ok]'));
    } else {
        console.log(chalk.red('[error]Conversion failed'));
        return;
    }

    //Move file to src
    console.log(chalk.yellow('Overwriting header in sources'));
    fs.writeFileSync(headerPath, fs.readFileSync(distPath + 'favicon.h'));
    if (fs.existsSync(headerPath)) {
        console.log(chalk.green('[ok]'));
    } else {
        console.log(chalk.red('[error]Overwriting failed'));
        return;
    }
};

// Create a gzip function for reusable purpose
const compressFile = (filePath, targetPath) => {
    const stream = createReadStream(filePath);
    stream
        .pipe(createGzip(targetPath))
        .pipe(createWriteStream(targetPath))
        .on('finish', () => {
            console.log(`Successfully compressed  at ${targetPath}`);
            convertToC(targetPath);
        });
};

compressFile(srcPath + 'favicon.ico', distPath + 'favicon.ico.gz');