using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using TMPro;
using Mirror;

public class GameManager : NetworkBehaviour
{
    public static Action<Team> OnTeamChanged;
    public static bool isMoving{
        get{
            return instance.IsMoving();
        }
    }
    [SyncVar]
    public bool m_isMoving =false;
    [SyncVar(hook = nameof(OnGameStartedChanged))]
    public bool gameStarted = false;
    void OnGameStartedChanged(bool oldStarted, bool newStarted){
        if(newStarted){
            GameCanvas.instance.HideWaitingForOpponentPanel();
        }else{
            GameCanvas.instance.ShowWaitingForOpponentPanel();
        }
    }

    [SyncVar(hook = nameof(OnSelectedTeamChanged))]
    public Team SelectedTeam = Team.Red;
    void OnSelectedTeamChanged(Team oldTeam, Team newTeam){
        Debug.Log($"Selected team changed from {oldTeam} to {newTeam}");
        OnTeamChanged?.Invoke(newTeam);
    }
    public static bool NoPuckSelected {
        get{
            return instance.selectedPuck == null;
        }
    }

    public int turnTimer = 10;
    [SyncVar]
    public float turnTimerCounter;
    public Rigidbody2D ball;
    public float puckForce = 20f;
    public AnimationCurve puckForceCurve = AnimationCurve.Linear(0,3,1,1);
    public float ballMoveTime = 3f;
    public float puckDragClampMax = 5f;
    public float puckDragMinClamp = 1f;

    [SyncVar(hook = nameof(OnScoreChanged))]
    public int redScore=0;
    [SyncVar(hook = nameof(OnScoreChanged))]
    public int blueScore=0;

    [Header("UI")]
    public TMP_Text redScoreText;
    public TMP_Text blueScoreText;
    public GameObject gameOverPanel;
    public GameObject blueWon,redWon;

    [Header("Misc")]
    public List<Puck> pucks = new List<Puck>();
    public float curPuckPullForce;
    [SyncVar]
    public int hitCounter = 0;


    

    public static GameManager instance;

    public float puckMass{
        get{
            if(pucks.Count > 0){return pucks[0].rb.mass;}else{return 1f;}
        }set{
            foreach(Puck puck in pucks){
                puck.rb.mass = value;
            }
        }
    }

    public float puckDrag{
        get{
            if(pucks.Count > 0){return pucks[0].rb.linearDamping;}else{return 0f;}
        }set{
            foreach(Puck puck in pucks){
                puck.rb.linearDamping = value;
            }
        }
    }
    void Awake()
    {
        instance = this;
    }

    void Start()
    {
        GameEvents.OnSelectedPuckChanged?.Invoke(null);

        #if UNITY_EDITOR

        #else
            Application.targetFrameRate = isServer ? 30 : 100;
        #endif
    }


    public void RegisterPuck(Puck puck){
        pucks.Add(puck);
    }

    public void DisposePuck(Puck puck){
        pucks.Remove(puck);
    }



    [SyncVar(hook = nameof(OnSelectedPuckChanged))]
    [SerializeField]Puck selectedPuck;

    void OnSelectedPuckChanged(Puck oldPuck, Puck newPuck){
        // Debug.Log($"Selected puck changed from {oldPuck} to {newPuck}");
        GameEvents.OnSelectedPuckChanged?.Invoke(newPuck);
    }
    public static Puck SelectedPuck{
        get{
            return instance.selectedPuck;
        }

        set{
            instance.SetSelectedPuck(value);
        }
    }
    void SetSelectedPuck(Puck puck)
    {
        selectedPuck = puck;
        GameEvents.OnSelectedPuckChanged?.Invoke(puck);
    }

    public Puck GetClosestPuck(Vector2 position){
        if(IsMoving()){return null;} //Do not do anything if shits moving

        // Convert screen position to world position
        // Vector3 worldPosition = Camera.main.ScreenToWorldPoint(new Vector3(position.x, position.y, Camera.main.nearClipPlane));
        
        // Find all pucks in the scene
        Puck[] pucks = FindObjectsOfType<Puck>();
        float minDistance = float.MaxValue;
        Puck closestPuck = null;

        foreach (Puck puck in pucks)
        {
            if(puck.team != SelectedTeam){continue;}
            float dist = Vector2.Distance(position, puck.transform.position);
            if (dist < minDistance)
            {
                minDistance = dist;
                closestPuck = puck;
            }
        }

        return closestPuck;
    }

    Coroutine coroutinePostLaunch;
    public void OnPointerUp(Vector2 direction)
    {
        if(direction.magnitude < puckDragMinClamp){
            selectedPuck = null;
            GameEvents.OnSelectedPuckChanged?.Invoke(null);
            return;
        }
        if(coroutinePostLaunch != null){
            StopCoroutine(coroutinePostLaunch);
        }
        coroutinePostLaunch = StartCoroutine(CoroutinePostLaunch());
        curPuckPullForce = direction.magnitude;
        float force = puckForce * puckForceCurve.Evaluate(curPuckPullForce);
        Debug.Log($"force = {puckForce} * {puckForceCurve.Evaluate(curPuckPullForce)} = {force}");
        Debug.Log($"launching puck at {direction} with {force * -direction} force");
        selectedPuck.GetComponent<Rigidbody2D>().AddForce(-direction * force, ForceMode2D.Impulse);
        hitCounter++;

        selectedPuck = null;
        GameEvents.OnSelectedPuckChanged?.Invoke(null);
        
        SwitchTeams();
    }

    void SwitchTeams(){
        if(!isServer){
            Debug.LogWarning("SwitchTeams called on client, skipping");
            return;
        }

        StartCoroutine(CoroutineSwitchTeams());
    }

    bool switchingTeams=false;
    IEnumerator CoroutineSwitchTeams(){
        switchingTeams=true;
        for(int i=0; i < 3; i++){
            yield return null;
        }
        while(m_isMoving){
            yield return null;
        }

        turnTimerCounter = 0;

        SelectedTeam = SelectedTeam == Team.Red ? Team.Blue : Team.Red;
        OnTeamChanged?.Invoke(SelectedTeam);

        switchingTeams=false;
    }


    IEnumerator CoroutinePostLaunch(){
        float t = 0;
        while ( t < 1){
            t += Time.deltaTime / ballMoveTime;
            ball.linearDamping = Mathf.Lerp(0, 10, t);
            yield return null;
        }
    }

    bool IsMoving(){
        if(freezeInput){return true;}
        float minMagnitude = 0.01f;
        foreach(Puck puck in pucks){
            if(puck.rb.linearVelocity.magnitude > minMagnitude){
                return true;
            }
        }

        if(ball.linearVelocity.magnitude > minMagnitude){
            return true;
        }

        return false;
    }

    void Update()
    {
        if(isServer){
            m_isMoving=IsMoving();

            HandleTurnTimer();

            if(!gameStarted){

                NetPlayer[] players = FindObjectsOfType<NetPlayer>();
                if (players.Length == 2)
                {
                    gameStarted = true;
                    GameCanvas.instance.HideWaitingForOpponentPanel();
                    Debug.Log("Game started On Server");
                }
            }
        }
    }

    void HandleTurnTimer(){
        if(turnTimerCounter < turnTimer){
            if(!isMoving && !switchingTeams && gameStarted){
                turnTimerCounter += Time.deltaTime;
            }
        }else{
            SwitchTeams();
            turnTimerCounter = 0;
        }
    }

    public void OnGoal(Team team){
        if(!isServer){
            Debug.LogWarning("OnGoal called on client, skipping");
            return;}
        
        freezeInput=true;

        if(hitCounter == 1){
            //kickoff goal
            Debug.Log("Kickoff goal");
            StartCoroutine(CoroutineOnGoal(team,true));//true = Kickoff goal, reset only the ball
        hitCounter = 0;

            return;
        }
        if(team == Team.Blue){
            blueScore++;
            blueScoreText.text = blueScore.ToString();
        }else{
            redScore++;
            redScoreText.text = redScore.ToString();
        }

        SwitchTeams();


        if(blueScore >= 3){
            RpcGameOver(Team.Blue);
            gameOver(Team.Blue);
        }else if(redScore >= 3){
            RpcGameOver(Team.Red);
            gameOver(Team.Red);
        }else{
            StartCoroutine(CoroutineOnGoal(team));
        }

        hitCounter = 0;
    }

    [ClientRpc]
    void RpcGameOver(Team team){
        gameOver(team);
    }

    void gameOver(Team team){
        gameOverPanel.SetActive(true);
        if(team == Team.Blue){
            blueWon.SetActive(true);
            redWon.SetActive(false);
        }else{
            blueWon.SetActive(false);
            redWon.SetActive(true);
        }
    }

    bool freezeInput = false;

    IEnumerator CoroutineOnGoal(Team team, bool kickoff = false){
        if(coroutinePostLaunch!=null){
            StopCoroutine(coroutinePostLaunch);
        }

        float t=0;
        while(t < 1){
            t +=Time.deltaTime * 2f;
            ball.linearDamping = Mathf.Lerp(0, 100, t);
            yield return null;
        }

        yield return new WaitForSeconds(2f);

        Reset();
    }

    void OnScoreChanged(int oldScore, int newScore){
        Debug.Log($"Score changed from {oldScore} to {newScore}");
        redScoreText.text = redScore.ToString();
        blueScoreText.text = blueScore.ToString();
    }


    public void Reset(bool kickoff = false)
    {
        StartCoroutine(CoroutineReset(kickoff));
    }

    IEnumerator CoroutineReset(bool kickoff = false){
        float resetDuration = 0.5f;
        if(!kickoff){
            foreach(Puck puck in pucks){
                puck.Reset(null, resetDuration);
            }
        }

        ball.GetComponent<Ball>().Reset(resetDuration);

        yield return new WaitForSeconds(resetDuration);

        freezeInput=false;
    }

}