/** @format */

import {ComBehaviorTree} from '../components/ComBehaviorTree'
import {ECSSystem} from '../lib/ECSSystem'
import {BT} from '../../behaviorTree/BehaviorTree'
import {FightWorld} from '../worlds/FightWorld'
import {ComCocosNode} from '../components/ComCocosNode'
import {GenFilterKey} from '../lib/ECSComponent'
import {Log} from '../../utils/LogUtils'

const FILTER_BEHAVIORTREE = GenFilterKey([ComBehaviorTree, ComCocosNode])

export class SysBehaviorTree extends ECSSystem {
    private _context: BT.ExecuteContext

    /** 连接 */
    public onAdd(world: FightWorld): void {
        this._context = new BT.ExecuteContext()
        this._context.init(this, world)
    }

    /** 断开连接 */
    public onRemove(world: FightWorld): void {}

    /** 添加实体 */
    public onEntityEnter(world: FightWorld, entity: number): void {}

    /**  */
    public onEntityLeave(world: FightWorld, entity: number): void {}

    /** 更新 */
    public onUpdate(world: FightWorld, dt: number): void {
        this._context.dt = dt
        world.getFilter(FILTER_BEHAVIORTREE).walk((entity: number) => {
            let comBehavior = world.getComponent(entity, ComBehaviorTree)
            if (!comBehavior.root) return
            this._context.set(entity, dt, comBehavior.bb)
            if (comBehavior.root.state !== BT.NodeState.Executing) {
                this.onEnterBTNode(comBehavior.root, this._context)
            } else {
                this.updateBTNode(comBehavior.root, this._context)
            }
            return false
        })
    }

    /** 进入节点 */
    public onEnterBTNode(node: BT.NodeBase, context: BT.ExecuteContext) {
        let handler = BT.NodeHandlers[node.type]
        handler.onEnter(node, context)
    }

    /** 更新节点状态 */
    public updateBTNode(node: BT.NodeBase, context: BT.ExecuteContext) {
        let handler = BT.NodeHandlers[node.type]
        handler.onUpdate(node, context)
    }

    public canExecuteBTNode(node: BT.NodeBase, context: BT.ExecuteContext): boolean {
        return true
    }
}