const fs = require('fs');
const readline = require('readline');
const src_dir = 'src';
const build_dir = 'build';

const files = ["src/index.html",
			   "src/about.html",
			   "src/projects/2016-XXXX.html",
			   "src/projects/2023-Pepperstone.html"]; // this list should be generated.

files.forEach( file => {
	var file_buffer = "";

	const rl = readline.createInterface({
		input: fs.createReadStream(file),
		output: process.stdout,
		terminal: false
	});

	const re_include = new RegExp('{% include \'*(.*)\' %}');
	const re_picture = new RegExp('{% picture.*%}');

	rl.on('line', line => {
		const match_include = line.match(re_include);
		const match_picture = line.match(re_picture);
		if (match_include) {
			line = line.replace(re_include, fs.readFileSync(match_include[1], 'utf8'));
		}
		if (match_picture) {
			const re_src = new RegExp("src=[\'\"](.*?)[\'\"]");
			const picture_src = match_picture[0].match(re_src)[1].split('/').slice(1).join('/');
			const re_alt = new RegExp("alt=[\'\"](.*?)[\'\"]");
			const alt = match_picture[0].match(re_alt)[1];
			ensureDirectoryExists(build_dir + '/' + picture_src);
			fs.cp(src_dir + '/' +  picture_src, build_dir + '/' + picture_src, { recursive: false }, (err) => {
				if (err) throw err;
			});
			line = line.replace(re_picture, "<img src=\'/" + picture_src + "\' alt=\'" + alt + "\' \>");
		}
		file_buffer += line;
	});

	rl.on('close', () => {
		ensureDirectoryExists(build_dir + '/' + file.split('/').slice(1).join('/'));
		fs.writeFileSync(build_dir + '/' + file.split('/').slice(1).join('/'), file_buffer, 'utf8');
    });
});

fs.cp('./src/styles','./build/styles', { recursive: true }, (err) => {
	if (err) throw err;
});


function ensureDirectoryExists(filePath) {
    var dirname = filePath.split('/').slice(0,-1).join('/');
    if (fs.existsSync("./" + dirname)) {
	return true;
    }
    ensureDirectoryExists(dirname);
    fs.mkdirSync(dirname);
}