// vim: set et sw=2 ts=2:
//
// This file is part of Moonfire NVR, a security camera network video recorder.
// Copyright (C) 2018 The Moonfire NVR Authors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// In addition, as a special exception, the copyright holders give
// permission to link the code of portions of this program with the
// OpenSSL library under certain conditions as described in each
// individual source file, and distribute linked combinations including
// the two.
//
// You must obey the GNU General Public License in all respects for all
// of the code used other than OpenSSL. If you modify file(s) with this
// exception, you may extend this exception to your version of the
// file(s), but you are not obligated to do so. If you do not wish to do
// so, delete this exception statement from your version. If you delete
// this exception statement from all source files in the program, then
// also delete it here.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

import $ from 'jquery';

/**
 * Class to control the view of NVR Settings.
 *
 * These  settings/controls include:
 * - Max video length
 * - Trim segment start/end
 * - Time Format
 */
export default class NVRSettingsView {
  /**
   * Construct based on element ids
   */
  constructor({
    videoLenId = 'split',
    trimCheckId = 'trim',
    tsTrackId = 'ts',
    timeFmtId = 'timefmt',
  } = {}) {
    this.ids_ = {videoLenId, trimCheckId, tsTrackId, timeFmtId};
    this.videoLength_ = null;
    this.videoLengthHandler_ = null;
    this.trim_ = null;
    this.trimHandler_ = null;
    this.timeFmtStr_ = null;
    this.timeFmtHandler_ = null;
    this.tsTrack_ = null;
    this.tsTrackHandler_ = null;
    this.wireControls_();
  }

  /**
   * Find selected option in <select> and return value, or first option's value.
   *
   * The first option's value is returned if no option is selected.
   *
   * @param  {jQuery} selectEl jQuery element for the <select>
   * @return {String}          Value of the selected/first option
   */
  findSelectedOrFirst_(selectEl) {
    let value = selectEl.find(':selected').val();
    if (!value) {
      value = selectEl.find('option:first-child').val();
    }
    return value;
  }

  /**
   * Wire up all controls and handlers.
   *
   */
  wireControls_() {
    const videoLengthEl = $(`#${this.ids_.videoLenId}`);

    function normalize(v) { return v == 'infinite' ? Infinity : Number(v); }
    this.videoLength_ = normalize(this.findSelectedOrFirst_(videoLengthEl));
    videoLengthEl.change((e) => {
      this.videoLength_ = normalize(e.currentTarget.value);
      if (this.videoLengthHandler_) {
        this.videoLengthHandler_(this.videoLength_);
      }
    });

    const trimEl = $(`#${this.ids_.trimCheckId}`);
    this.trim_ = trimEl.is(':checked');
    trimEl.change((e) => {
      this.trim_ = e.currentTarget.checked;
      if (this.trimHandler_) {
        this.trimHandler_(this.trim_);
      }
    });

    const timeFmtEl = $(`#${this.ids_.timeFmtId}`);
    this.timeFmtStr_ = this.findSelectedOrFirst_(timeFmtEl);
    timeFmtEl.change((e) => {
      this.timeFmtStr_ = e.target.value;
      if (this.timeFmtHandler_) {
        this.timeFmtHandler_(this.timeFmtStr_);
      }
    });

    const trackEl = $(`#${this.ids_.tsTrackId}`);
    this.tsTrack_ = trackEl.is(':checked');
    trackEl.change((e) => {
      this.tsTrack_ = e.target.checked;
      if (this.tsTrackHandler_) {
        this.tsTrackHandler_(this.tsTrack_);
      }
    });
  }

  /**
   * Get currently selected video length.
   *
   * @return {Number} Video length value
   */
  get videoLength() {
    return this.videoLength_;
  }

  /**
   * Get currently selected time format string.
   *
   * @return {String} Format string
   */
  get timeFormatString() {
    return this.timeFmtStr_;
  }

  /**
   * Get currently selected trim setting.
   *
   * @return {Boolean}
   */
  get trim() {
    return this.trim_;
  }

  /**
   * Determine value of timestamp tracking option
   *
   * @return {Boolean}
   */
  get timeStampTrack() {
    return this.tsTrack_;
  }

  /**
   * Set a handler to be called when the time format string changes.
   *
   * The handler will be called with one argument: the new format string.
   *
   * @param  {Function} handler Format change handler
   */
  set onTimeFormatChange(handler) {
    this.timeFmtHandler_ = handler;
  }

  /**
   * Set a handler to be called when video length popup changes.
   *
   * The handler will be called with one argument: the new video length.
   *
   * @param  {Function} handler Video Length change handler
   */
  set onVideoLengthChange(handler) {
    this.videoLengthHandler_ = handler;
  }

  /**
   * Set a handler to be called when video trim checkbox changes.
   *
   * The handler will be called with one argument: the new trim value (Boolean).
   *
   * @param  {Function} handler Trim change handler
   */
  set onTrimChange(handler) {
    this.trimHandler_ = handler;
  }

  /**
   * Set a handler to be called when video timestamp tracking checkbox changes.
   *
   * The handler will be called with one argument: the new tsTrack value
   * (Boolean).
   *
   * @param  {Function} handler Timestamp track change handler
   */
  set onTimeStampTrackChange(handler) {
    this.tsTrackHandler_ = handler;
  }
}