package app.lab;

import java.io.BufferedWriter;

public class BabelLab {
    public static void main(String[] args) throws Exception {
        // https://github.com/Daniel15/babel-standalone
        String babelPath = "src/main/webapp/resources/js/babel.min.js";
        Reader babelScript = new InputStreamReader(new FileInputStream(babelPath), StandardCharsets.UTF_8.name());
        ScriptEngine engine = new ScriptEngineManager().getEngineByMimeType("text/javascript");

        SimpleBindings bindings = new SimpleBindings();
        engine.eval(babelScript, bindings);

        String eval = "Babel.transform(input, { presets: ['es2015', 'react', 'stage-2'] }).code";
//      bindings.put("input", "<Component name={name} age='16' hobby={'reading'} />");
//      Object output = engine.eval(eval, bindings);
//      System.out.println(output);

        Map<String, String> jsxPathMap = new ImmutableMap.Builder<String, String>()
                .put("src/main/webapp/resources/js/form.js.jsx", "src/main/webapp/resources/js/form.js")
                .put("src/main/webapp/resources/js/reactcomp.js.jsx", "src/main/webapp/resources/js/reactcomp.js")
                .build();
        for (String jsxPath: jsxPathMap.keySet()) {
            byte[] fileBytes = Files.readAllBytes(new File(jsxPath).toPath());
            String fileString = new String(fileBytes, StandardCharsets.UTF_8.name());
            bindings.put("input", fileString);
            System.out.print("converting " + jsxPath + " ... ");
            String outputx = (String) engine.eval(eval, bindings);
            String outPath = jsxPathMap.get(jsxPath);
            System.out.println("Done ! Now writing to " + outPath);
            try (BufferedWriter writer = new BufferedWriter(new FileWriter(outPath))) {
                writer.write(outputx);
            }
        }
    }
}