using System;
using System.Collections.Generic;
using Reset.Core.Tools;
using Reset.Units;
using UnityEngine;
using Random = UnityEngine.Random;

public class UnitCombat : MonoBehaviour{
    public List<Collider> draggedUnits = new List<Collider>();
    
    private UnitMovementHandler movement;

    private Vector3 lastPosition;
    private Vector3 positionDelta;

    private float lastSpeed;
    private float speedDelta;
    private float sinAmplitude;
    private float sinOffset;
    
    void Awake(){
        movement = GetComponent<UnitMovementHandler>();
    }

    void Start(){
        lastPosition = transform.position;
        sinOffset = Random.value;
        sinAmplitude = 1 + Random.value / 4f;
    }

    // Update is called once per frame
    void Update(){
        DragAttackedUnits();
    }

    void DragAttackedUnits(){
        // Get the original difference in position for speed and direction
        positionDelta = Vector3.Lerp(positionDelta, lastPosition.DirectionTo(transform.position), 5f * Time.deltaTime);
        speedDelta = Vector3.Distance(lastPosition, transform.position) / Time.deltaTime;

        // Add some randomness to the movements based on small offsets
        float sinVal = Mathf.Sin(2f + sinOffset) * sinAmplitude;
        speedDelta += sinVal;
        
        // Set a floor to prevent them from not moving enough
        speedDelta = Mathf.Max(3f, speedDelta);
        
        // Multiply the speed to be lower when further, and faster when close
        float speedDiff = Mathf.Lerp(.2f, 1.4f, speedDelta);
        speedDelta *= speedDiff;
        
        // Debug 
        DebugOverlayDrawer.ChangeValue($"Combat - {name}", "Position Delta", positionDelta);
        DebugOverlayDrawer.ChangeValue($"Combat - {name}", "Speed Delta", speedDelta);
           
        // Update last known position
        lastPosition = transform.position;

        // Apply the speed, direction, and rotation to each unit
        foreach (Collider draggedUnit in draggedUnits) {
            UnitMovementHandler draggedUnitMovement = draggedUnit.GetComponent<UnitMovementHandler>();
            if (!draggedUnitMovement) {
                Debug.LogError($"No available UnitMovement on {draggedUnit.name}. Aborting drag on this unit.");
                continue;
            }

            draggedUnitMovement.SetNewRotation(-transform.position.DirectionTo(draggedUnit.transform.position), 1f, true);
            draggedUnitMovement.SetNewDirection((positionDelta).ToVector2(), 1f, true);
            draggedUnitMovement.SetNewSpeed(speedDelta, 1f, true);
        }
    }
}