#!/usr/bin/nodejs
/*
Mashes together a bunch of different apps into a big binary blob.
We then store this *inside* the Bangle.js firmware and can use it
to populate Storage initially.

Bangle.js 1 doesn't really have anough flash space for this,
but we have enough on v2.
*/
var SETTINGS = {
  pretokenise : true
};

var path = require('path');
var ROOTDIR = path.join(__dirname, '..');
var APPDIR = ROOTDIR+'/apps';
var APPJSON = ROOTDIR+'/apps.json';
var OUTFILE = path.join(ROOTDIR, '../Espruino/libs/banglejs/banglejs2_storage_default.c');
var APPS = [ // IDs of apps to install
  "boot","launchb2","s7clk","setting",
  "about","alarm","widlock","widbat","widbt"
];
var MINIFY = true;

var fs = require("fs");
global.Const = {
  /* Are we only putting a single app on a device? If so
  apps should all be saved as .bootcde and we write info
  about the current app into app.info */
  SINGLE_APP_ONLY : false,
};

var AppInfo = require(ROOTDIR+"/core/js/appinfo.js");
var appjson = JSON.parse(fs.readFileSync(APPJSON).toString());
var appfiles = [];

function fileGetter(url) {
  console.log("Loading "+url)
  if (MINIFY) {
    if (url.endsWith(".json")) {
      var f = url.slice(0,-5);
      console.log("MINIFYING JSON "+f);
      var j = eval("("+fs.readFileSync(url).toString("binary")+")");
      var code = JSON.stringify(j);
      //console.log(code);
      url = f+".min.json";
      fs.writeFileSync(url, code);
    }
  }
  return Promise.resolve(fs.readFileSync(url).toString("binary"));
}

Promise.all(APPS.map(appid => {
  var app = appjson.find(app=>app.id==appid);
  if (app===undefined) throw new Error(`App ${appid} not found`);
  return AppInfo.getFiles(app, {
    fileGetter : fileGetter,
    settings : SETTINGS
  }).then(files => {
    appfiles = appfiles.concat(files);
  });
})).then(() => {
  // work out what goes in storage
  var storageContent = "";
  appfiles.forEach((file) => {
    var fileLength = file.content.length;
    console.log(file.name+" -> "+fileLength+"b");
    // set up header
    var header = new Uint8Array(32);
    header.fill(0);
    header.set([fileLength,fileLength>>8,fileLength>>16,fileLength>>24],0); // length
    for (var i=0;i<file.name.length;i++)
      header[4+i] = file.name.charCodeAt(i);
    // add header and file content
    storageContent += String.fromCharCode.apply(String, header);
    storageContent += file.content;
    // pad length
    while (fileLength&3) {
      storageContent += "\xff";
      fileLength++;
    }
  });
  // work out file contents
  var cfile = `// Initial storage contents for Bangle.js 2.0
// Generated by BangleApps/bin/build_bangles_c.js

const int jsfStorageInitialContentLength = ${storageContent.length};
const char jsfStorageInitialContents[] = {
`;
for (var i=0;i<storageContent.length;i+=32) {
  var chunk = storageContent.substr(i,32);
  cfile += chunk.split("").map(c=>c.charCodeAt()).join(",")+",\n";
}
cfile += `};
`;
  fs.writeFileSync(OUTFILE, cfile);
  console.log("Output written to "+OUTFILE);
});