const storage = require('Storage');

const boolFormat = (v) => v ? "On" : "Off";

let m;

function showMainMenu() {
  const mainmenu = {
    '': {
      'title': 'App Manager',
    },
    'Free': {
      value: undefined,
      format: (v) => {
        return storage.getFree();
      },
      onchange: () => {}
    },
    'Compact': () => {
      E.showMessage('Compacting...');
      try {
        storage.compact();
      } catch (e) {
      }
      m = showMainMenu();
    },
    'Apps': ()=> m = showApps(),
    '< Back': ()=> {load();}
  };
  return E.showMenu(mainmenu);
}

function isGlob(f) {return /[?*]/.test(f)}
function globToRegex(pattern) {
  const ESCAPE = '.*+-?^${}()|[]\\';
  const regex = pattern.replace(/./g, c => {
    switch (c) {
      case '?': return '.';
      case '*': return '.*';
      default: return ESCAPE.includes(c) ? ('\\' + c) : c;
    }
  });
  return new RegExp('^'+regex+'$');
}

function eraseFiles(app) {
  app.files.split(",").forEach(f=>storage.erase(f));
}
function eraseData(app) {
  if(!app.data) return;
  const d=app.data.split(';'),
    files=d[0].split(','),
    sFiles=(d[1]||'').split(',');
  let erase = f=>storage.erase(f);
  files.forEach(f=>{
    if (!isGlob(f)) erase(f);
    else storage.list(globToRegex(f)).forEach(erase);
  })
  erase = sf=>storage.open(sf,'r').erase();
  sFiles.forEach(sf=>{
    if (!isGlob(sf)) erase(sf);
    else storage.list(globToRegex(sf+'\u0001'))
      .forEach(fs=>erase(fs.substring(0,fs.length-1)));
  })
}
function eraseApp(app, files,data) {
  E.showMessage('Erasing\n' + app.name + '...');
  if (files) eraseFiles(app)
  if (data) eraseData(app)
}
function eraseOne(app, files,data){
  E.showPrompt('Erase\n'+app.name+'?').then((v) => {
    if (v) {
      Bangle.buzz(100, 1);
      eraseApp(app, files,data)
      showApps();
    } else {
      showAppMenu(app)
    }
  })
}
function eraseAll(apps, files,data) {
  E.showPrompt('Erase all?').then((v) => {
    if (v) {
      Bangle.buzz(100, 1);
      for(var n = 0; n<apps.length; n++)
        eraseApp(apps[n], files,data);
    }
    showApps();
  })
}

function showAppMenu(app) {
  let appmenu = {
    '': {
      'title': app.name,
    },
    '< Back': () => m = showApps(),
  }
  if (app.data) {
    appmenu['Erase Completely']    = () => eraseOne(app, true, true)
    appmenu['Erase App,Keep Data'] = () => eraseOne(app,true, false)
    appmenu['Only Erase Data']     = () => eraseOne(app,false, true)
  } else {
    appmenu['Erase'] = () => eraseOne(app,true, false)
  }
  return E.showMenu(appmenu);
}

function showApps() {
  const appsmenu = {
    '': {
      'title': 'Apps',
    },
    '< Back': () => m = showMainMenu(),
  };

  var list = storage.list(/\.info$/).filter((a)=> {
    return a !== 'setting.info';
  }).sort().map((app) => {
    var ret = storage.readJSON(app,1)||{};
    ret[''] = app;
    return ret;
  });

  if (list.length > 0) {
    list.reduce((menu, app) => {
      menu[app.name] = () => m = showAppMenu(app);
      return menu;
    }, appsmenu);
    appsmenu['Erase All'] = () => {
      E.showMenu({
        '': {'title': 'Erase All'},
        'Erase Everything':     () => eraseAll(list, true, true),
        'Erase Apps,Keep Data': () => eraseAll(list, true, false),
        'Only Erase Data':      () => eraseAll(list, false, true),
        '< Back': () => showApps(),
      });
    };
  } else {
    appsmenu['...No Apps...'] = {
      value: undefined,
      format: ()=> '',
      onchange: ()=> {}
    };
  }
  return E.showMenu(appsmenu);
}

m = showMainMenu();