ShatteredSword/src/shattered_sword/AI/EnemyAI.ts

import GoapActionPlanner from "../../Wolfie2D/AI/GoapActionPlanner";
import StateMachineAI from "../../Wolfie2D/AI/StateMachineAI";
import StateMachineGoapAI from "../../Wolfie2D/AI/StateMachineGoapAI";
import GoapAction from "../../Wolfie2D/DataTypes/Interfaces/GoapAction";
import AABB from "../../Wolfie2D/DataTypes/Shapes/AABB";
import Stack from "../../Wolfie2D/DataTypes/Stack";
import State from "../../Wolfie2D/DataTypes/State/State";
import Vec2 from "../../Wolfie2D/DataTypes/Vec2";
import GameEvent from "../../Wolfie2D/Events/GameEvent";
import GameNode from "../../Wolfie2D/Nodes/GameNode";
import AnimatedSprite from "../../Wolfie2D/Nodes/Sprites/AnimatedSprite";
import OrthogonalTilemap from "../../Wolfie2D/Nodes/Tilemaps/OrthogonalTilemap";
import NavigationPath from "../../Wolfie2D/Pathfinding/NavigationPath";
import Weapon from "../GameSystems/items/Weapon";
import BattlerAI from "./BattlerAI";

import Patrol from "./EnemyStates/Patrol";
import { Statuses } from "../sword_enums";

import Sprite from "../../Wolfie2D/Nodes/Sprites/Sprite";

import MathUtils from "../../Wolfie2D/Utils/MathUtils";
export default class EnemyAI extends StateMachineGoapAI implements BattlerAI {
    /** The owner of this AI */
    owner: AnimatedSprite;

    /** The total possible amount of health this entity has */
    maxHealth: number;

    /** The current amount of health this entity has */
    CURRENT_HP: number;

    /** The default movement speed of this AI */
    speed: number = 20;

    /** The weapon this AI has */
    weapon: Weapon;

    /** A reference to the player object */
    player: GameNode;

    // The current known position of the player
    playerPos: Vec2;

    // The last known position of the player
    lastPlayerPos: Vec2;

    // Attack range
    inRange: number;

    // Path to player
    //path: NavigationPath;

    // Path away from player
    retreatPath: NavigationPath;

    tilemap: OrthogonalTilemap;

    velocity: Vec2 = Vec2.ZERO;

    direction: number; //1 for right, -1 for left

    initializeAI(owner: AnimatedSprite, options: Record<string, any>): void {
        this.owner = owner;

        //add states
         // Patrol mode
        this.addState(EnemyStates.DEFAULT, new Patrol(this, owner));
        
        this.maxHealth = options.health;

        this.CURRENT_HP = options.health;

        this.weapon = options.weapon;

        this.player = options.player;

        this.inRange = options.inRange;

        this.goal = options.goal;

        this.currentStatus = options.status;

        this.possibleActions = options.actions;

        this.plan = new Stack<GoapAction>();

        this.planner = new GoapActionPlanner();

        //TODO - get correct tilemap
        //this.tilemap = this.owner.getScene().getTilemap(options.tilemap) as OrthogonalTilemap;
        this.tilemap = <OrthogonalTilemap>this.owner.getScene().getLayer("Wall").getItems()[0];
        //this.tilemap = <OrthogonalTilemap>this.owner.getScene().getTilemap("Main");

        // Initialize to the default state
        this.initialize(EnemyStates.DEFAULT);

        //this.getPlayerPosition();

        this.direction = 1; //default moving to the right
        
    }

    activate(options: Record<string, any>): void { }

    damage(damage: number): void {
        this.CURRENT_HP -= damage;

        // If we're low enough, add Low Health status to enemy
        if (this.CURRENT_HP <= Math.floor(this.maxHealth/2)) {
            
        }

        // If health goes below 0, disable AI and fire enemyDied event
        if (this.CURRENT_HP <= 0) {
            this.owner.setAIActive(false, {});
            this.owner.isCollidable = false;
            this.owner.visible = false;

            this.emitter.fireEvent("enemyDied", {enemy: this.owner})


            if (Math.random() < 0.05) {
                // give buff maybe
                //this.emitter.fireEvent("giveBuff", { position: this.owner.position });
            }
        }
    }

    //TODO - need to modify for side view
    /*
    isPlayerVisible(pos: Vec2): Vec2{
        //Check if one player is visible, taking into account walls

        // Get the new player location
        let start = this.owner.position.clone();
        let delta = pos.clone().sub(start);

        // Iterate through the tilemap region until we find a collision
        let minX = Math.min(start.x, pos.x);
        let maxX = Math.max(start.x, pos.x);
        let minY = Math.min(start.y, pos.y);
        let maxY = Math.max(start.y, pos.y);

        // Get the wall tilemap
        let walls = <OrthogonalTilemap>this.owner.getScene().getLayer("Wall").getItems()[0];

        let minIndex = walls.getColRowAt(new Vec2(minX, minY));
        let maxIndex = walls.getColRowAt(new Vec2(maxX, maxY));

        let tileSize = walls.getTileSize();

        for (let col = minIndex.x; col <= maxIndex.x; col++) {
            for (let row = minIndex.y; row <= maxIndex.y; row++) {
                if (walls.isTileCollidable(col, row)) {
                    // Get the position of this tile
                    let tilePos = new Vec2(col * tileSize.x + tileSize.x / 2, row * tileSize.y + tileSize.y / 2);

                    // Create a collider for this tile
                    let collider = new AABB(tilePos, tileSize.scaled(1 / 2));

                    let hit = collider.intersectSegment(start, delta, Vec2.ZERO);

                    if (hit !== null && start.distanceSqTo(hit.pos) < start.distanceSqTo(pos)) {
                        // We hit a wall, we can't see the player
                        return null;
                    }
                }
            }
        }

        return pos;
    }
    */

    

    update(deltaT: number){
        super.update(deltaT);

        // This is the plan that is executed in the Active state, so whenever we don't have a plan, acquire a new one given the current statuses the enemy has
        /*
        if (this.plan.isEmpty()) {
            //get a new plan
            this.plan = this.planner.plan(Statuses.REACHED_GOAL, this.possibleActions, this.currentStatus, null);
        }
        */
        
    }
}

export enum EnemyStates {
    DEFAULT = "default",
    ALERT = "alert",
    PREVIOUS = "previous"
}