using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// Logic block which deals with jumping a character in a direction
/// </summary>
[CreateAssetMenu(menuName = "Major Project/Jump Block")]
[System.Serializable]
public class Jump : LogicBlock
{

    [SerializeField]
    [Tooltip("Direction to Jump")]
    protected Direction direction = Direction.Forward;

    [SerializeField]
    [Tooltip("Max distance Jump can go")]
    protected int Distance = 2;

    [SerializeField]
    [Tooltip("Max height Jump can go")]
    protected int Height = 1;

    #region Class Functions

    /// <summary>
    /// Implementation of BlockLogic, moves the player forward
    /// </summary>
    /// <param name="player">Player to move</param>
    protected override IEnumerator BlockLogic(Character player, float animationTime, bool useBlockDirection = false)
    {
        //player.Jump(direction, animationTime);

        player.justMoved = true;
        Block endBlock = GetEndBlock(player.CurrentBlock, player.transform, ~player.Ignore);

        while(endBlock.CurrentPlayer != null)
        {
            yield return player.StartCoroutine(player.AnimateToPosition(endBlock.VisualPosition + Vector3.up * 0.5f, Character.Animation.Jump, 0.8f));
            endBlock.CurrentPlayer.StartAnimation(Character.Animation.Hit);
            endBlock = GetEndBlock(endBlock, player.transform, ~player.Ignore);
        }

        yield return player.StartCoroutine(player.MoveToBlock(endBlock, Character.Animation.Jump, animationTime));

    }

    /// <summary>
    /// Returns the block that the character will endUp on after they use this logic element
    /// </summary>
    /// <param name="startBlock">block character is on</param>
    /// <param name="layerMask">layers to ignore</param>
    /// <returns>block which character will finish on after performing this function </returns>
    public override Block GetEndBlock(Block startBlock, Transform transform, LayerMask layerMask)
    {
        //if there is a block infront JumpUp else LongJump
        if (Block.isBlockAtPosition(startBlock.position + direction.ToVector(transform) + Vector3.up, 1, layerMask))
            return JumpUp(startBlock, transform, layerMask);
        else
            return JumpLong(startBlock, transform, layerMask);
    }


    #endregion Class Functions

    #region Helper Functions
    private Block JumpLong(Block StartBlock, Transform transform, LayerMask layerMask)
    {
        //setting up variables
        Vector3 position; // position wanted
        Block hit; //output of block detection
        Block retVal = StartBlock; //block we'll actually move to

        //Check blocks in front until we hit an obstruction or went the distance
        for (int i = 1; i <= Distance; i++)
        {
            //Next position to MoveTo
            position = StartBlock.position + (direction.ToVector(transform) * i);

            //if jump is obstructed, stop and go to last known block
            if (Block.isBlockAtPosition(position + Vector3.up, 1, layerMask))
                break;


            //If block at Position is walkable set it to last known position
            if (Block.isBlockAtPosition(position, 1, layerMask, out hit) && hit.isWalkable(layerMask))
                retVal = hit;
            //else if block down one is walkable
            else if (Block.isBlockAtPosition(position + Vector3.down, 1, layerMask, out hit) && hit.isWalkable(layerMask))
                retVal = hit;

        }

        return retVal;
    }

    /// <summary>
    /// Jumps up obstacle of specific height. Jumps as high as possible
    /// </summary>
    /// <param name="direction">Direction of obstacle</param>
    /// <param name="height">max height</param>
    private Block JumpUp(Block StartBlock, Transform transform, LayerMask layerMask)
    {
        //setting up variables
        Vector3 position; // position wanted
        Block hit; //output of block detection
        Block retVal = StartBlock; //block we'll actually move to

        //Check blocks in going up then move to the heighest walkable one
        for (int i = 0; i <= Height; i++)
        {
            //next position up the tower
            position = StartBlock.position + direction.ToVector(transform) + (Vector3.up * i);

            //if block is walkable set it to last known position
            if (Block.isBlockAtPosition(position, 1, layerMask, out hit) && hit.isWalkable(layerMask))
                retVal = hit;
        }

        return retVal;
    }


    #endregion Helper Functions



    #region Serialisation functions
    public override void CopyToken(BlockToken token)
    {
        base.CopyToken(token);
        direction = ((DirectionToken)token).direction;
    }

    public override BlockToken ToToken(BlockToken token = null)
    {
        if (token == null)
            token = new DirectionToken(this);

        DirectionToken retVal = (DirectionToken)base.ToToken(token);
        retVal.direction = direction;

        return retVal;
    }
    #endregion Serialisation functions


}