using Cinemachine;
using FMODUnity;
using System.Collections;
using System.Collections.Generic;
using System.Xml.Serialization;
using UnityEngine;

public class CameraManager : MonoBehaviour
{
    public static CameraManager _instance { get; private set; }

    private GameObject m_Brain;

    private Camera m_Camera;

    private GameObject m_ActiveCamera;

    private List<GameObject> m_CameraObjects = new List<GameObject>();

	private List<CameraSettings> m_CameraSettings = new List<CameraSettings>();

	private float m_TotalWeight = 0;

    private int m_SameCameraTypeCount;

    [Header("Layer Masks")]
    public LayerMask m_Everything;
    public LayerMask m_Agent;
    public LayerMask m_Bodies;
    public LayerMask m_Environment;
    public LayerMask m_Actuations;
	public LayerMask m_Compare;

    [Header("Text Objects")]
    public GameObject m_Rewards;

    [Header("Camera Settings")]
    [Range(2, 20)]
    public int m_CameraBlendMin;
    [Range(2, 20)]
    public int m_CameraBlendMax;
    [Range(5, 180)]
    public int m_CameraSwapMin;
    [Range(5, 180)]
    public int m_CameraSwapMax;
    public bool m_CameraController;
    private int m_CameraIndex = 0;

	[Header("Shader")]
	public Material m_HumanoidMaterial;
	public Color m_BackgroundColor;

    private void Awake()
    {
        if(_instance != null)
            Destroy(this);
        else
            _instance = this;
    }

    private void OnEnable()
    {
        CreateCameraList();
        InitialCameraSetup();
        SetCullingMask();
    }

    private void Start()
    {
        if(!m_CameraController)
            StartCoroutine(CameraSwitch());
    }

    private void Update(){
        if (m_CameraController)
            CameraControllerInput();
    }

    private void CameraControllerInput(){
        var count = 0;
        if(Input.GetKeyDown(KeyCode.LeftArrow)){
            if (m_CameraIndex != 0)
                m_CameraIndex--;
        }

        if(Input.GetKeyDown(KeyCode.RightArrow)){
            if (m_CameraIndex != 1)
                m_CameraIndex++;
        }


        for(int i = 0 + (m_CameraIndex * 10); i < m_CameraObjects.Count; i++){
            if(Input.GetKeyDown(KeyCode.Alpha0 + ( i - ( m_CameraIndex * 10 ) ))){
                foreach(GameObject obj in m_CameraObjects){
                    if(count == i){
                        Debug.Log($"Swapping to:{obj.name}, {m_CameraSettings[i].cameraWeight}");
                        SetCamera(obj);
                        break;
                    }
                    count++;
                }
            }
        }
    }

    IEnumerator CameraSwitch()
    {
        SetNewCamera();
        yield return new WaitForSecondsRealtime(Random.Range(m_CameraSwapMin, m_CameraSwapMax));
        StartCoroutine(CameraSwitch());
    }

    private void SetCullingMask()
    {
        m_Camera = m_Brain.GetComponent<Camera>();

        string currentTag = m_ActiveCamera.tag;
        switch (currentTag)
        {
            case "vc_Agent":
                m_Camera.cullingMask = m_Agent;
                m_Rewards.SetActive(true);
                break;
            case "vc_Body":
                m_Camera.cullingMask = m_Bodies;
                m_Rewards.SetActive(false);
                break;
            case "vc_Environment":
                m_Camera.cullingMask = m_Environment;
                m_Rewards.SetActive(false);
                break;
            case "vc_Actuations":
                m_Camera.cullingMask = m_Actuations;
                m_Rewards.SetActive(true);
                break;
			case "vc_Compare":
                m_Camera.cullingMask = m_Compare;
                m_Rewards.SetActive(true);
                break;
        }

    }

    private void SetNewCamera()
    {
        // Get all objects with 0 priority
        List<int> deactiveCameras = new List<int>();

		// Count through camera objects, check if 0 priority (off), we add to
		// list of deactivated cameras.
        for(int i = 0; i < m_CameraObjects.Count; i++)
        {
            GameObject t = m_CameraObjects[i];
            CinemachineVirtualCamera virtualCamera = t.GetComponent<CinemachineVirtualCamera>();
            if (virtualCamera != null && virtualCamera.Priority == 0)
				deactiveCameras.Add(i);

        }

		List<int> shuffledList = ShuffleList(deactiveCameras);		

		float totalWeight = CalculateNewTotalWeight(shuffledList);

        float randomIndex = Random.Range(0f, totalWeight);

		Debug.Log($"Random Number: {randomIndex}");

		GameObject selectedCamera = null;
		int selectedCameraIndex = 0;

		for (int i = 0; i < shuffledList.Count; i++){
			randomIndex -= m_CameraSettings[shuffledList[i]].cameraWeight;
			Debug.Log($"Adj Index: {randomIndex}, Weight: {totalWeight}, {m_CameraSettings[shuffledList[i]].cameraWeight}, Name: {m_CameraObjects[shuffledList[i]].name}");
			if(randomIndex <= 0){
				// Activate Selected Camera 
				selectedCamera = m_CameraObjects[shuffledList[i]];
				selectedCameraIndex = shuffledList[i];
				break;
			}
		}

		Debug.Log($"Selected Camera: {selectedCamera.name}, {m_CameraSettings[selectedCameraIndex].cameraWeight}");

		SetCamera(selectedCamera);
    }

    private void SetCamera(GameObject camera)
    {
        SetCameraBlend(camera);

        // Set all camera to active, and set all priorities to 0, bar the first camera
        foreach (GameObject obj in m_CameraObjects)
        {
            CinemachineVirtualCamera vCam = obj.GetComponent<CinemachineVirtualCamera>();
            vCam.Priority = 0;
        }

        camera.GetComponent<CinemachineVirtualCamera>().Priority = 1;
        
        m_ActiveCamera = camera;

        SetCullingMask();
    }

    private void SetCameraBlend(GameObject pastCamera)
    {
        // Check activate camera tag, and apply the necessary blend-mode
        CinemachineBrain cmBrain = m_Brain.GetComponent<CinemachineBrain>();
        float blendtime = (float)Random.Range(m_CameraBlendMin, m_CameraBlendMax);

        if (AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Body", "vc_Agent") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Environment", "vc_Agent") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Environment", "vc_Body")
            || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Environment", "vc_Environment") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Body", "vc_Body") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Actuations", "vc_Body") 
            || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Actuations", "vc_Environment") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Actuations", "vc_Agent") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Actuations", "vc_Actuations") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Actuations", "vc_Compare") 
			|| AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Compare", "vc_Compare") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Environment", "vc_Compare") || AreDifferentPairs(pastCamera.tag, m_ActiveCamera.tag, "vc_Body", "vc_Compare"))
            blendtime = 0;

        cmBrain.m_DefaultBlend.m_Time = blendtime;
    }

    private bool AreDifferentPairs(string a, string b, string pair1, string pair2)
    {
        return (a == pair1 && b == pair2) || (a == pair2 && b == pair1);
    }

    private void InitialCameraSetup() 
    { 
        // Set all camera to active, and set all priorities to 0, bar the first camera
        foreach(GameObject obj in m_CameraObjects)
        {
            CinemachineVirtualCamera vCam = obj.GetComponent<CinemachineVirtualCamera>();
            vCam.Priority = 0;
        }

        m_CameraObjects[0].GetComponent<CinemachineVirtualCamera>().Priority = 1;
        m_ActiveCamera = m_CameraObjects[0];
    }

    private void CreateCameraList()
    {
        GameObject parentObject = GameObject.Find("CM List");

        if(parentObject != null)
        {
            AddActiveChildrenRecursively(parentObject.transform);
        } 
        else
        {
            Debug.LogError("CM List <GameObject> not found.");
        }

        try
        {
            m_Brain = GameObject.Find("CM Brain");
			// Set dissapear color same as sky color
			m_Brain.GetComponent<Camera>().backgroundColor = m_BackgroundColor;
			Debug.Log(m_BackgroundColor);
			m_HumanoidMaterial.SetColor("_DissapearColor", m_BackgroundColor);
        }
        catch
        {
            Debug.LogError("CM Brain <GameObject> could not be found.");
        }

        Debug.Log($"Camera Count: {m_CameraObjects.Count}");

		CreateCameraSettingsList();
       
    }

	private void CreateCameraSettingsList(){

		VirtualCameraSettings camSettings = null;

		foreach(GameObject cam in m_CameraObjects){
			camSettings = null;

			try{
				camSettings = cam.GetComponent<VirtualCameraSettings>();
			} catch {
				Debug.LogError("No Camera Settings found.");
			}

			if(camSettings != null){
				m_CameraSettings.Add(camSettings.m_CameraSettings);
				m_TotalWeight += camSettings.m_CameraSettings.cameraWeight;
			}
		}

		Debug.Log($"Total Weight: {m_TotalWeight}");
	}

	private float CalculateNewTotalWeight(List<int> deactiveCameras){

		float totalWeight = 0;
		foreach(int index in deactiveCameras){
			totalWeight += m_CameraSettings[index].cameraWeight;
		}
		return totalWeight;
	}

    void AddActiveChildrenRecursively(Transform parentTransform)
    {
        foreach (Transform child in parentTransform)
        {
            if (child.gameObject.activeSelf && child.GetComponent<CinemachineVirtualCamera>() != null)
            {
                m_CameraObjects.Add(child.gameObject);
            }

            // Recursively call the function for each child
            AddActiveChildrenRecursively(child);
        }
    }

	private List<int> ShuffleList(List<int> list){

		for (int i = list.Count - 1; i > 0; i--){
			int j = Random.Range(0, i + 1);
			int temp = list[i];
			list[i] = list[j];
			list[j] = temp;
		}

		return list;
	}
}