using System.Collections.Generic;
using UnityEngine;

public class GuardCamera : Photon.PunBehaviour {

    private Light mSpotlight;
    private Camera mCamera;
    private AudioListener mListener;

    private float xRotation = 0.0f;
    private float yRotation = 0.0f;

    private List<int> mPlayers; // Photo Player IDs

    void Start()
    {
        // Get components
        mSpotlight = GetComponent<Light>();
        mCamera = GetComponent<Camera>();
        mListener = GetComponent<AudioListener>();

        // Everything off by default
        mSpotlight.enabled = false;
        mCamera.enabled = false;
        mListener.enabled = false;

        // Initalize rotation information
        xRotation = transform.eulerAngles.y;
        yRotation = transform.eulerAngles.x;

        // Initialize empty player queue
        mPlayers = new List<int>();
    }
	
	void Update()
    {
        Quaternion newRotation = Quaternion.AngleAxis(xRotation, Vector3.up);
        newRotation *= Quaternion.AngleAxis(-yRotation, -Vector3.right);
        transform.localRotation = Quaternion.Slerp(transform.rotation, newRotation, Time.time * 0.01f);
    }

    /**
     * Called when the player switches to a camera.
     */
    public void Activate()
    {
        // Turn on this camera for the player.
        mCamera.enabled = true;
        mListener.enabled = true;

        // Trigger adding a player to this camera.
        photonView.RPC("AddPlayer", PhotonTargets.All, PhotonNetwork.player.ID);
    }

    /**
     * Called when a player switches away from a camera.
     */
    public void Deactivate()
    {
        // Turn off this camera for the player.
        mCamera.enabled = false;
        mListener.enabled = false;

        // Trigger removing a player from this camera.
        photonView.RPC("RemovePlayer", PhotonTargets.All, PhotonNetwork.player.ID);
    }

    public bool InControl()
    {
        if (mPlayers.Count == 0 || mPlayers[0] != PhotonNetwork.player.ID)
        {
            return false;
        }
        return true;
    }

    /**
     * Attempt to rotate the camera.
     */
    public void Rotate(float xRotation, float yRotation)
    {
        // Do nothing if not in control.
        if (!InControl())
        {
            return;
        }

        // Append the new rotation.
        this.xRotation += xRotation;
        this.yRotation += yRotation;

        // Limit the rotation according to these constraints.
        this.xRotation = this.xRotation % 360;
        this.yRotation = Mathf.Clamp(this.yRotation, -45, 80);

        // Notify everyone else that the camera rotated.
        photonView.RPC("UpdateRotation", PhotonTargets.Others, this.xRotation, this.yRotation);
    }

    /*
     * Called via RPC to add a player to this camera.
     */
    [PunRPC]
    void AddPlayer(int player)
    {
        // Add the player to the queue.
        mPlayers.Add(player);

        // Because there is now a player, make sure the spotlight is on.
        mSpotlight.enabled = true;
    }

    /*
     * Called via RPC to remove a player from this camera.
     */
    [PunRPC]
    void RemovePlayer(int player)
    {
        // Remove the player from the queue.
        mPlayers.Remove(player);

        // If no more players, turn off spotlight.
        if (mPlayers.Count == 0)
        {
            mSpotlight.enabled = false;
        }
    }

    /**
     * Called via RPC to update with new rotation data.
     */
    [PunRPC]
    void UpdateRotation(float xRotation, float yRotation)
    {
        this.xRotation = xRotation;
        this.yRotation = yRotation;
    }
}