#!/usr/bin/env node
// Gracias a:
// - Código original: https://github.com/akx/source-from-sourcemaps
// - Aguante: https://gist.github.com/banyudu/b17a9cb3f05296b76a9f3051f66c3dcd
// - Algoritmo: https://github.com/rarecoil/unwebpack-sourcemap

const fs = require("fs")
const util = require("util")
const writeFileP = util.promisify(fs.writeFile)
const readFileP = util.promisify(fs.readFile)
const mkdirP = util.promisify(fs.mkdir)
const path = require("path")
const { SourceMapConsumer } = require("source-map")

const outputDir = 'sources-gen'

function sanitizePath (path) {
    let newPath = path
        .replace(/^webpack:\/\/\/?/, "")
        .replace(/~\//, "node_modules/")
        .replace(/\?.+$/, "")
        .replace(/\.\.\//g, 'parent_dir/')
        .replace(/\.\//g, '')
    return newPath
}

async function processFile(pth) {
    const data = await readFileP(pth, "UTF-8");
    const consumer = await new SourceMapConsumer(data);

    const processors = consumer.sources.map(async (src) => {
        const fsSrc = path.join(
            outputDir,
            sanitizePath(src)
        )
        if (fsSrc.includes('node_modules')) {
            console.warn(`Not saving ${fsSrc} because it is node_modules`)
            return
        }

        const source = consumer.sourceContentFor(src, true)
        if (!source) {
            console.warn("Unable to source", src)
            return
        }
        await mkdirP(path.dirname(fsSrc), { recursive: true })
        await writeFileP(fsSrc, source, "UTF-8")
        console.log(`Wrote ${fsSrc}`)
    })
    await Promise.all(processors)

    consumer.destroy();
}

function main() {
    return processFile(process.argv[2])
}

if (!module.parent) {
    main().then(() => process.exit(0));
}