let m = require('mithril');
let rs = require('rswebui');

const RS_FILE_CTRL_PAUSE = 0x00000100;
const RS_FILE_CTRL_START = 0x00000200;
const RS_FILE_CTRL_FORCE_CHECK = 0x00000400;

const FT_STATE_FAILED = 0x0000;
const FT_STATE_OKAY = 0x0001;
const FT_STATE_WAITING = 0x0002;
const FT_STATE_DOWNLOADING = 0x0003;
const FT_STATE_COMPLETE = 0x0004;
const FT_STATE_QUEUED = 0x0005;
const FT_STATE_PAUSED = 0x0006;
const FT_STATE_CHECKING_HASH = 0x0007;

const RS_FILE_REQ_ANONYMOUS_ROUTING = 0x00000040

function makeFriendlyUnit(bytes) {
  let cnt = bytes;
  for (s of ['','k','M','G']) {
    if (cnt < 1000) {
        return cnt.toFixed(1) + ' ' + s + 'B';
    } else {
       cnt = cnt / 1024;
    }
  }
  return cnt.toFixed(1) + 'TB';
}

function calcRemainingTime(bytes, rate) {
    if (rate <=0 || bytes < 1) {
        return '--';
    } else {
        let secs = bytes / rate / 1024;
        if (secs < 60) {
            return secs.toFixed() + 's';
        }
        let mins = secs / 60; secs = secs - Math.floor(mins) * 60;
        if (mins < 60) {
            return mins.toFixed() +'m ' + secs.toFixed() + 's';
        }
        let hours = mins / 60; mins = mins -Math.floor(hours) * 60;
        if (hours < 24) {
            return hours.toFixed() +'h ' + mins.toFixed() + 'm';
        }
        let days = hours / 24; hours = hours - Math.floor(days) * 24;
        return days.toFixed() + 'd ' + hours.toFixed() + 'h';
    }
}

function fileAction(hash, action) {
  let action_header = '';
  let json_params = {
    hash,
    flags: 0
  };
  switch (action) {
    case 'cancel':
      action_header = '/rsFiles/FileCancel';
      break;

    case 'pause':
      action_header = '/rsFiles/FileControl';
      json_params.flags = RS_FILE_CTRL_PAUSE;
      break;

    case 'resume':
      action_header = '/rsFiles/FileControl';
      json_params.flags = RS_FILE_CTRL_START;
      break;

    case 'force_check':
      action_header = '/rsFiles/FileControl';
      json_params.flags = RS_FILE_CTRL_FORCE_CHECK;
      break;

    default:
      console.error('Unknown action in Downloads.control()');
      return;
  };
  rs.rsJsonApiRequest(action_header, json_params, () => {});
};

function actionButton(file, action) {
  switch (action) {
    case 'resume':
      return m('button', {
        title: 'resume',
        onclick: function() {
          fileAction(file.hash, 'resume');
        },
      }, m('i.fas.fa-play'));

    case 'pause':
      return m('button', {
        title: 'pause',
        onclick: function() {
          fileAction(file.hash, 'pause');
        },
      }, m('i.fas.fa-pause'));

    case 'cancel':
      return m('button.red', {
        title: 'cancel',
        onclick: function() {
          fileAction(file.hash, 'cancel');
        },
      }, m('i.fas.fa-times'));
  }
};

const ProgressBar = () => {
  return {
    view: (v) => m('.progressbar', {
        style: {
          content: v.attrs.rate + '%'
        }
      },
      m('span.progress-status', {
        style: {
          width: v.attrs.rate + '%'
        }
      }, v.attrs.rate.toPrecision(3) + '%'))
  };
};

const File = () => {
  return {
    view: (v) => m('.file-view', {
      key: v.attrs.info.hash,
      style: {
        display: v.attrs.info.isSearched ? "block" : "none",
      }
    }, [
      m('p', v.attrs.info.fname),
      (v.attrs.direction === 'up' || v.attrs.info.downloadStatus === FT_STATE_COMPLETE) ? [] : [
        actionButton(v.attrs.info, 'cancel'),
        actionButton(v.attrs.info,
          v.attrs.info.downloadStatus === FT_STATE_PAUSED ?
          'resume' : 'pause'),
      ],
      v.attrs.direction === 'up' ? [] :
      m(ProgressBar, {
        rate: v.attrs.transferred / v.attrs.info.size.xint64 * 100,
      }),
      m('span.filestat', m('i.fas.fa-file'), makeFriendlyUnit(
        v.attrs.info.size.xint64)),
      m('span.filestat', m('i.fas.fa-arrow-circle-' + v.attrs.direction),
        makeFriendlyUnit(v.attrs.info.tfRate * 1024) + '/s'),
      v.attrs.direction === 'up' ? [] :
      m('span.filestat', {title: 'time remaining'}, [ m('i.fas.fa-clock'),
        calcRemainingTime( v.attrs.info.size.xint64 - v.attrs.transferred, v.attrs.info.tfRate)]),
      m('span.filestat', {title: 'peers'}, [m('i.fas.fa-users'), v.attrs.info.peers.length], v.attrs.parts.reduce((a,e) => [...a, ' - ' + makeFriendlyUnit(e)],[])),
    ]),
  }
};

const SearchBar = () => {
  let searchString = '';
  return {
    view: (v) =>
      m('input[type=text][placeholder=search].searchbar', {
        value: searchString,
        oninput: (e) => {
          searchString = e.target.value.toLowerCase();
          for(let hash in v.attrs.list) {
            if(v.attrs.list[hash].fname.toLowerCase().indexOf(
                searchString) > -1) {
              v.attrs.list[hash].isSearched = true;
            } else {
              v.attrs.list[hash].isSearched = false;
            }
          }
        },
      }),
  };
};

function compareArrays(big, small) {
  // Use filter on bigger array
  // Pass `new Set(array_to_compare)` as second param to filter
  // Source: https://stackoverflow.com/a/40538072/7683374
  return big.filter(function(val) {
    return !this.has(val);
  }, new Set(small));
};

module.exports = {
  RS_FILE_CTRL_PAUSE,
  RS_FILE_CTRL_START,
  RS_FILE_CTRL_FORCE_CHECK,
  FT_STATE_FAILED,
  FT_STATE_OKAY,
  FT_STATE_WAITING,
  FT_STATE_DOWNLOADING,
  FT_STATE_COMPLETE,
  FT_STATE_QUEUED,
  FT_STATE_PAUSED,
  FT_STATE_CHECKING_HASH,
  RS_FILE_REQ_ANONYMOUS_ROUTING,
  makeFriendlyUnit,
  File,
  SearchBar,
  compareArrays,
};