// Copyright 2016 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace GoogleVR.VideoDemo {
  using UnityEngine;
  using System.Collections;
  using UnityEngine.UI;

  public class VideoControlsManager : MonoBehaviour {
    private GameObject pauseSprite;
    private GameObject playSprite;

    private Slider videoScrubber;
    private Slider volumeSlider;
    private GameObject volumeWidget;
    private GameObject settingsPanel;
    private GameObject bufferedBackground;
    private Vector3 basePosition;
    private Text videoPosition;
    private Text videoDuration;

    public GvrVideoPlayerTexture Player
    {
      set;
      get;
    }

    void Awake() {
      foreach (Text t in GetComponentsInChildren<Text>()) {
        if (t.gameObject.name == "curpos_text") {
          videoPosition = t;
        } else if (t.gameObject.name == "duration_text") {
          videoDuration = t;
        }
      }

      foreach (RawImage raw in GetComponentsInChildren<RawImage>(true)) {
        if (raw.gameObject.name == "playImage") {
          playSprite = raw.gameObject;
        } else if (raw.gameObject.name == "pauseImage") {
          pauseSprite = raw.gameObject;
        }
      }

      foreach (Slider s in GetComponentsInChildren<Slider>(true)) {
        if (s.gameObject.name == "video_slider") {
          videoScrubber = s;
          videoScrubber.maxValue = 100;
          videoScrubber.minValue = 0;
          foreach (Image i in videoScrubber.GetComponentsInChildren<Image>()) {
            if (i.gameObject.name == "BufferedBackground") {
              bufferedBackground = i.gameObject;
            }
          }
        } else if (s.gameObject.name == "volume_slider") {
          volumeSlider = s;
        }
      }

      foreach (RectTransform obj in GetComponentsInChildren<RectTransform>(true)) {
        if (obj.gameObject.name == "volume_widget") {
          volumeWidget = obj.gameObject;
        } else if (obj.gameObject.name == "settings_panel") {
          settingsPanel = obj.gameObject;
        }
      }
    }

    void Start() {
      foreach (ScrubberEvents s in GetComponentsInChildren<ScrubberEvents>(true)) {
        s.ControlManager = this;
      }

      if (Player != null) {
        Player.Init();
      }
    }

    void Update() {
      if ((!Player.VideoReady || Player.IsPaused)) {
        pauseSprite.SetActive(false);
        playSprite.SetActive(true);
      } else if (Player.VideoReady && !Player.IsPaused) {
        pauseSprite.SetActive(true);
        playSprite.SetActive(false);
      }

      if (Player.VideoReady) {
        if (basePosition == Vector3.zero) {
          basePosition = videoScrubber.handleRect.localPosition;
        }
        videoScrubber.maxValue = Player.VideoDuration;
        videoScrubber.value = Player.CurrentPosition;

        float pct = Player.BufferedPercentage / 100.0f;
        float sx = Mathf.Clamp(pct, 0, 1f);
        bufferedBackground.transform.localScale = new Vector3(sx, 1, 1);
        bufferedBackground.transform.localPosition =
            new Vector3(basePosition.x - (basePosition.x * sx), 0, 0);

        videoPosition.text = FormatTime(Player.CurrentPosition);
        videoDuration.text = FormatTime(Player.VideoDuration);

        if (volumeSlider != null) {
          volumeSlider.minValue = 0;
          volumeSlider.maxValue = Player.MaxVolume;
          volumeSlider.value = Player.CurrentVolume;
        }
      } else {
        videoScrubber.value = 0;
      }
    }

    public void OnVolumeUp() {
      if (Player.CurrentVolume < Player.MaxVolume) {
        Player.CurrentVolume += 1;
      }
    }

    public void OnVolumeDown() {
      if (Player.CurrentVolume > 0) {
        Player.CurrentVolume -= 1;
      }
    }

    public void OnToggleVolume() {
      bool visible = !volumeWidget.activeSelf;
      volumeWidget.SetActive(visible);

      // close settings if volume opens.
      settingsPanel.SetActive(settingsPanel.activeSelf && !visible);
    }

    public void OnToggleSettings() {
      bool visible = !settingsPanel.activeSelf;
      settingsPanel.SetActive(visible);

      // close settings if volume opens.
      volumeWidget.SetActive(volumeWidget.activeSelf && !visible);
    }

    public void OnPlayPause() {
      bool isPaused = Player.IsPaused;
      if (isPaused) {
        Player.Play();
      } else {
        Player.Pause();
      }
      pauseSprite.SetActive(isPaused);
      playSprite.SetActive(!isPaused);
      CloseSubPanels();
    }

    public void OnVolumePositionChanged(float val) {
      if (Player.VideoReady) {
        Debug.Log("Setting current volume to " + val);
        Player.CurrentVolume = (int)val;
      }
    }

    public void CloseSubPanels() {
      volumeWidget.SetActive(false);
      settingsPanel.SetActive(false);
    }

    public void Fade(bool show) {
      if (show) {
        StartCoroutine(DoAppear());
      } else {
        StartCoroutine(DoFade());
      }
    }

    IEnumerator DoAppear() {
      CanvasGroup cg = GetComponent<CanvasGroup>();
      while (cg.alpha < 1.0) {
        cg.alpha += Time.deltaTime * 2;
        yield return null;
      }
      cg.interactable = true;
      yield break;
    }

    IEnumerator DoFade() {
      CanvasGroup cg = GetComponent<CanvasGroup>();
      while (cg.alpha > 0) {
        cg.alpha -= Time.deltaTime;
        yield return null;
      }
      cg.interactable = false;
      CloseSubPanels();
      yield break;
    }

    private string FormatTime(long ms) {
      int sec = ((int)(ms / 1000L));
      int mn = sec / 60;
      sec = sec % 60;
      int hr = mn / 60;
      mn = mn % 60;
      if (hr > 0) {
        return string.Format("{0:00}:{1:00}:{2:00}", hr, mn, sec);
      }
      return string.Format("{0:00}:{1:00}", mn, sec);
    }
  }
}