using System.Collections.Generic;
using UnityEngine;

public class MouseInMap : MonoBehaviour
{
    public float targetDistanceThreshold = 6f;
    public float enemyDistanceThreshold = 1f;

    [SerializeField]
    private Camera playCamera;
    [SerializeField]
    private GameObject AgentObj;
    [SerializeField]
    private GameObject environmentObj;
    [SerializeField]
    private GameObject mousePreviewObj;
    [SerializeField]
    private GameObject enemyContainerObj;
    [SerializeField]
    private GameObject sceneBlockContainerObj;
    [SerializeField]
    private GameObject targetControllerObj;
    [SerializeField]
    private GameObject HUDObj;

    private Vector3 nowHitPosition = Vector3.zero;
    private Vector3 nowHitPositionRelative = Vector3.zero;
    private LayerMask groundMask;
    private int blockNum;
    private CommonParameterContainer commonParamCon;
    private GameObject previewModel;
    private TargetController targetCon;
    private MousePreview mousePreviewCon;
    private EnemyContainer enemyCon;
    private SceneBlockContainer sceneBlockCon;
    private MessageBoxController messageCon;
    private TargetUIController targetUICon;

    private const string ErrorMessageColor = "#800000ff";
    private const string LevelTooHighError = "[Error]MouseInMap:ChangeBlockLevelTo:";
    private const string AttackLevelErrorMsg = "Attack Level is too high!";
    private const string GotoLevelErrorMsg = "Goto Level is too high!";

    public enum MouseMode
    {
        Default,
        AttackSet,
        GotoSet,
        EnemySet
    }

    public MouseMode mouseMode = MouseMode.Default;
    public int blockLevel = 0;

    private void Start()
    {
        commonParamCon = CommonParameterContainer.Instance;
        groundMask = LayerMask.GetMask("Ground");
        targetCon = targetControllerObj.GetComponent<TargetController>();
        mousePreviewCon = mousePreviewObj.GetComponent<MousePreview>();
        enemyCon = enemyContainerObj.GetComponent<EnemyContainer>();
        sceneBlockCon = sceneBlockContainerObj.GetComponent<SceneBlockContainer>();
        targetUICon = HUDObj.GetComponent<TargetUIController>();
        messageCon = HUDObj.GetComponent<MessageBoxController>();
    }

    private void Update()
    {
        nowHitPosition = GetMouseOnMapPosition();
        nowHitPositionRelative = nowHitPosition - environmentObj.transform.position;
        // if mouse position in area, update mouseInMapPosition as nowHitPosition
        if (nowHitPositionRelative.x < targetCon.maxAgentAreaX && nowHitPositionRelative.x > targetCon.minAgentAreaX && nowHitPositionRelative.z < targetCon.maxEnemyAreaZ && nowHitPositionRelative.z > targetCon.minAgentAreaZ)
        {
            mousePreviewCon.UpdatePreviewPosition(nowHitPosition);
            // Mouse button R pressed
            if (Input.GetMouseButtonDown(1))
            {
                switch (mouseMode)
                {
                    case MouseMode.AttackSet:
                        if (IsAgentorEnemyWithinDistance(targetDistanceThreshold))
                        {
                            // if agent or enemy is nearby, do not create new block
                            messageCon.PushMessage(new List<string> { "Agent or Enemy is too close!" },
                                new List<string> { messageCon.errorColor });
                        }
                        else
                        {
                            // if agent or enemy is not nearby, create new block
                            sceneBlockCon.CreateNewBlock(Targets.Attack, blockLevel, blockNum, nowHitPositionRelative);
                            sceneBlockCon.InitializeBlock(environmentObj);
                            targetCon.AttackModeChange(nowHitPositionRelative);
                            ChangeMouseMode(MouseMode.Default);
                        }
                        break;

                    case MouseMode.GotoSet:
                        if (IsAgentorEnemyWithinDistance(targetDistanceThreshold))
                        {
                            // if agent or enemy is nearby, do not create new block
                            messageCon.PushMessage(new List<string> { "Agent or Enemy is too close!" },
                                new List<string> { messageCon.errorColor });
                        }
                        else
                        {
                            // if agent or enemy is not nearby, create new block
                            sceneBlockCon.CreateNewBlock(Targets.Go, blockLevel, blockNum, nowHitPositionRelative);
                            sceneBlockCon.InitializeBlock(environmentObj);
                            targetCon.GotoModeChange(nowHitPositionRelative);
                            ChangeMouseMode(MouseMode.Default);
                        }
                        break;

                    case MouseMode.EnemySet:
                        if (IsAgentorEnemyWithinDistance(enemyDistanceThreshold))
                        {
                            messageCon.PushMessage(new List<string> { "Agent or Enemy is too close!" },
                                new List<string> { messageCon.errorColor });
                        }
                        else
                        {
                            enemyCon.InitEnemyAtHere(new Vector3(nowHitPositionRelative.x, 1, nowHitPositionRelative.z));
                        }
                        break;

                    default:
                        break;
                }
            }
        }
    }

    // change mouse mode, level and PreviewModel
    public void ChangeMouseMode(MouseMode mouseMode, int level = -1, int blockNum = -1)
    {
        this.mouseMode = mouseMode;
        Targets nowTargetType;
        switch (mouseMode)
        {
            case MouseMode.AttackSet:
            case MouseMode.GotoSet:
                // set target type
                nowTargetType = GetTargetTypeByMouseMode(mouseMode);
                // set blockLevel or send error message
                if (level < 0)
                {
                    // while blockLevel is not set, send error message
                    messageCon.PushMessage(new List<string> { "[ERROR]MouseInMap:ChangeMouseMode:", "Level not set!", "mouseMode=", mouseMode.ToString() },
                        new List<string> { messageCon.errorColor });
                    blockLevel = commonParamCon.scenePrefabSet.GetLevelNumber(nowTargetType);
                }
                else
                {
                    // while blockLevel is set
                    blockLevel = level;
                }
                blockLevel = level;
                // set blockNum or random choose attack scene block type
                if (blockNum < 0)
                {
                    // while blockNum is not set, random choose block type
                    this.blockNum = Random.Range(0, commonParamCon.scenePrefabSet.GetBlockNumber(blockLevel, nowTargetType));
                }
                else
                {
                    // while blockNum is set
                    this.blockNum = blockNum;
                }
                // set previewModel
                previewModel = commonParamCon.scenePrefabSet.GetPrefab(blockLevel, this.blockNum, nowTargetType);
                mousePreviewCon.ChangePreviewTo(previewModel);
                break;

            case MouseMode.EnemySet:
                // set enemy as preview
                previewModel = enemyCon.enemyPrefab;
                mousePreviewCon.ChangePreviewTo(previewModel, true);
                break;

            default:
                // default mode, delete all preview model
                mousePreviewCon.DeleteAllPreviewModele();
                break;
        }
    }

    // get mouse position on map, return an absolute Vector3 coordinate
    public Vector3 GetMouseOnMapPosition()
    {
        // shoot raycast from mainCamera center to mousepositon
        RaycastHit nowHit;
        Ray ray = playCamera.ScreenPointToRay(Input.mousePosition);
        // if raycast hit gameobject
        if (Physics.Raycast(ray, out nowHit, Mathf.Infinity, groundMask))
        {
            //draw raycast
            Debug.DrawRay(ray.origin, ray.direction * 100, Color.red);
            return nowHit.point;
        }
        else
        {
            return Vector3.zero;
        }
    }

    // check if agent or enemy is too close to nowHitPosition
    private bool IsAgentorEnemyWithinDistance(float distance)
    {
        // check all child object in enemyContainerObj
        // if any child object is near by nowHitPosition in 10, return true
        Vector3 playerPosition = Vector3.zero;
        for (int i = 0; i < enemyContainerObj.transform.childCount; i++)
        {
            //set enemy Position's y as 0
            playerPosition = enemyContainerObj.transform.GetChild(i).position;
            playerPosition.y = 0;
            // check if enemy near by nowHitPositionRelative in distance, return true
            if (Vector3.Distance(playerPosition, nowHitPosition) < distance)
            {
                return true;
            }
        }
        // set agentObj position's y as 0
        playerPosition = AgentObj.transform.position;
        playerPosition.y = 0;
        // check if agentObj near by nowHitPositionRelative in distance, return true
        if (Vector3.Distance(playerPosition, nowHitPosition) < distance)
        {
            return true;
        }
        // if no enemy or agent near by, return false
        return false;
    }

    // change to TargetType from MouseMode
    private Targets GetTargetTypeByMouseMode(MouseMode mode)
    {
        switch (mode)
        {
            case MouseMode.AttackSet:
                return Targets.Attack;

            case MouseMode.GotoSet:
                return Targets.Go;

            default:
                messageCon.PushMessage(new List<string> { "[Error]MouseInMap:GetTargetTypeByMouseMode:", "Mouse Mode not found!", "mode=", mode.ToString() },
                    new List<string> { messageCon.errorColor });
                return Targets.Num;
        }
    }
}