using Spine.Unity;
using TMPro;
using UnityEngine;

public class DispatchersController : MonoBehaviour
{
    enum DispatcherState : byte
    {
        Idle,
        Moving,
        MissionProgressing,
        BackToBase,
    }

    [SerializeField] SkeletonGraphic[] dispatcherAnims;
    [SerializeField] RectTransform startPosition;
    [SerializeField] LineBetweenObjects lineBetweenOriginToButton;
    [SerializeField] TextMeshProUGUI moveRemainTimeText;

    DispatchData.Area targetArea;

    DispatcherState state;

    Vector2 targetPos;

    float moveElapsedTime;

    RectTransform rt => (RectTransform)transform;

    private void LateUpdate()
    {
        if (targetArea is null) return;

        DispatcherState prevState = state;

        SetTimersAndStateOfCurrent();

        bool isMoving = false;
        switch (state)
        {
            case DispatcherState.Moving:
                {
                    ChangeLookDirection(targetPos - rt.anchoredPosition);
                    rt.anchoredPosition = Vector2.Lerp(startPosition.anchoredPosition, targetPos, moveElapsedTime / targetArea.MissionMoveTime);
                    isMoving = true;
                }
                break;
            case DispatcherState.MissionProgressing:
                {
                    rt.anchoredPosition = targetPos;
                }
                break;
            case DispatcherState.BackToBase:
                {
                    ChangeLookDirection(startPosition.anchoredPosition - rt.anchoredPosition);
                    rt.anchoredPosition = Vector2.Lerp(targetPos, startPosition.anchoredPosition, moveElapsedTime / targetArea.MissionMoveTime);
                    isMoving = true;
                }
                break;
        }

        if(prevState != state)
            SetDispatcherAnimByState();

        lineBetweenOriginToButton?.gameObject.SetActive(state != DispatcherState.Idle);

        moveRemainTimeText?.gameObject.SetActive(isMoving);
        if(isMoving)
        {
            float remainTime = targetArea.MissionMoveTime - moveElapsedTime;
            moveRemainTimeText?.SetText(FormatString.TextTime((int)remainTime));
        }
    }

    private void SetTimersAndStateOfCurrent()
    {
        var now = TimeUtils.Now();
        if (targetArea.Mission.EndTime >= now)
        {
            var missionStartTime = targetArea.Mission.EndTime.AddSeconds(-targetArea.Mission.TotalProgressTime);
            float curProgressTimeSec = (float)(now - missionStartTime).TotalSeconds;

            if (curProgressTimeSec < targetArea.MissionMoveTime)
            {
                state = DispatcherState.Moving;
                moveElapsedTime = curProgressTimeSec;
            }
            else if (curProgressTimeSec < targetArea.MissionMoveTime + targetArea.MissionProgressTime)
            {
                state = DispatcherState.MissionProgressing;
            }
            else if (curProgressTimeSec < targetArea.Mission.TotalProgressTime)
            {
                state = DispatcherState.BackToBase;
                moveElapsedTime = curProgressTimeSec - targetArea.MissionMoveTime - targetArea.MissionProgressTime;
            }
        }
        else
        {
            state = DispatcherState.Idle;
        }
    }

    private void SetDispatcherAnimByState()
    {
        string animName = GetAnimNameByState();

        for(int i = 0; i < dispatcherAnims.Length; i++)
            dispatcherAnims[i].AnimationState.SetAnimation(0, animName, true);
    }

    private string GetAnimNameByState()
    {
        switch (state)
        {
            case DispatcherState.Idle: return "idle";
            case DispatcherState.Moving: return "move";
            case DispatcherState.MissionProgressing: return "attack";
            case DispatcherState.BackToBase: return "move";
        }

        return "idle";
    }

    public void SetDispatch(RectTransform targetPos, DispatchData.Area targetArea)
    {
        this.targetArea = targetArea;
        this.targetPos = targetPos.anchoredPosition;

        for (int i = 0; i < targetArea.EmployeeIDs.Count; i++)
        {
            if (MateDataGroup.Instance.TryGetMateData(targetArea.EmployeeIDs[i], out var mateData))
                SetDispatcher(i, mateData);
            else
                SetDispatcher(i, null);
        }

        lineBetweenOriginToButton?.SetStart(startPosition);
        lineBetweenOriginToButton?.SetEnd(targetPos);

        state = DispatcherState.Idle;
    }

    private void SetDispatcher(int index, MateData mateData)
    {
        if (index < 0 || index >= dispatcherAnims.Length) return;

        var anim = dispatcherAnims[index];

        if(mateData is null)
        {
            anim.gameObject.SetActive(false);
        }
        else
        {
            anim.skeletonDataAsset = mateData.SkeletonDataAsset;
            anim.Initialize(true);
        }
    }

    private void ChangeLookDirection(Vector2 lookDirection)
    {
        Vector3 rot = Vector3.zero;
        if (lookDirection.x < 0)
            rot = Global.V3_RotRev;

        for (int i = 0; i < dispatcherAnims.Length; i++)
            dispatcherAnims[i].transform.rotation = Quaternion.Euler(rot);
    }
}