import { _decorator, Component, Vec3 } from 'cc';
import {
    Direction, GameState, GridType, MoveState, MoverRole,
    addDirection, getMoveCondition, lookupMove,
} from '../core/Define';
import { GameManager } from '../manager/GameManager';

const { ccclass, property } = _decorator;

@ccclass('Movement')
export class Movement extends Component {
    @property
    moveSpeed = 4;

    direction: Direction = Direction.North;
    moveState: MoveState = MoveState.Idle;
    moverRole: MoverRole = 'player';

    protected targetPosition = new Vec3();
    protected targetGridType: GridType = GridType.None;
    protected lastPosition = new Vec3();
    protected step = 0;

    private moveWait = false;
    private queue: Promise<void> = Promise.resolve();
    static callEach = false;

    get curGrid(): GridType {
        return GameManager.instance!.calculateGridType(this.node.position);
    }
    get nextGrid(): GridType {
        return GameManager.instance!.calculateNextGridType(this.node.position, this.direction);
    }
    get lastGrid(): GridType {
        return GameManager.instance!.calculateLastGridType(this.node.position, this.direction);
    }
    get isFront(): boolean {
        return this.direction === Direction.South || this.direction === Direction.East;
    }

    start() {
        this.setDirection(this.direction);
    }

    update(dt: number) {
        if (this.moveState !== MoveState.Moving) return;
        const pos = this.node.position;
        const next = new Vec3();
        Vec3.moveTowards(next, pos, this.targetPosition, this.moveSpeed * dt);
        this.node.setPosition(next);
        this.onMoving();
        if (Vec3.distance(next, this.targetPosition) < 0.01) {
            this.node.setPosition(this.targetPosition);
            this.moveState = MoveState.Idle;
            this.moveWait = false;
            this.onMoveToTarget();
        }
    }

    setDirection(dir: Direction) {
        this.direction = dir;
    }

    protected onMoving() {}
    protected onMoveToTarget() {}
    protected onMoveNextSet(_isJump: boolean) {}
    protected onMoveFail(_isJump: boolean) {}
    protected playMoveAnim() {}

    private moveNextCheck(isJump: boolean, toFront: boolean): number {
        const gm = GameManager.instance!;
        const dir = toFront ? this.direction : addDirection(this.direction, 2);
        const targetTmp = gm.nextGridPosition(this.node.position, dir);
        const targetType = gm.calculateGridType(targetTmp);
        const table = getMoveCondition(gm.multMode);
        const nextG = toFront ? this.nextGrid : this.lastGrid;
        const v = lookupMove(table, this.moverRole, this.curGrid, nextG, isJump);
        if (v !== undefined) {
            if (v === 1) {
                if (gm.multMode) {
                    const nextCell = gm.worldToCell(targetTmp);
                    for (const n of ['PlayerA1', 'PlayerA2', 'PlayerA3', 'PlayerB1', 'PlayerB2', 'PlayerB3']) {
                        const p = gm.findNodeByName(n);
                        if (p) {
                            const c = gm.worldToCell(p.worldPosition);
                            if (c.x === nextCell.x && c.y === nextCell.y) return 0;
                        }
                    }
                    if (nextG === GridType.Ride) {
                        const ride = gm.getGameObject(targetTmp);
                        const expect = this.node.name.replace('Player', 'Vehicle');
                        if (ride && ride.name !== expect) return 0;
                    }
                }
                this.targetPosition.set(targetTmp);
                this.targetGridType = targetType;
            }
            return v;
        }
        return gm.multMode ? 0 : -1;
    }

    private enqueue(fn: () => Promise<void>) {
        this.queue = this.queue.then(fn).catch((e) => console.error(e));
    }

    private waitUntil(cond: () => boolean): Promise<void> {
        return new Promise((resolve) => {
            const tick = () => {
                if (cond()) resolve();
                else requestAnimationFrame(tick);
            };
            tick();
        });
    }

    private async moveCoroutine(n: number, isJump: boolean) {
        await this.waitUntil(() => !this.moveWait);
        const toFront = n > 0;
        this.step = Math.abs(n);
        const gm = GameManager.instance!;
        while (this.step > 0 && gm.gameState === GameState.Run) {
            this.step--;
            const r = this.moveNextCheck(isJump, toFront);
            if (r === -1) {
                this.onMoveFail(isJump);
                return;
            }
            if (r === 1) {
                this.moveWait = true;
                this.lastPosition.set(this.node.position);
                this.moveState = MoveState.Moving;
                this.onMoveNextSet(isJump);
                await this.waitUntil(() => !this.moveWait);
            } else {
                this.playMoveAnim();
                this.moveState = MoveState.Moving;
            }
        }
    }

    private async rotateCoroutine(n: number) {
        await this.waitUntil(() => !this.moveWait);
        this.moveWait = true;
        this.setDirection(addDirection(this.direction, n));
        this.moveWait = false;
        this.onMoveToTarget();
    }

    protected jsCallCheck(n: number): boolean {
        const gm = GameManager.instance!;
        const name = this.node.name;
        if (name === 'Player' || name === 'Vehicle') return gm.jsCallCheck(n);
        if (gm.multMode) return gm.jsCallCheckMultMode(n, name);
        return false;
    }

    callMove(n: number) {
        if (!this.jsCallCheck(n)) return;
        this.enqueue(() => this.moveCoroutine(n, false));
    }

    callRotateLeft(n: number) {
        if (!this.jsCallCheck(n)) return;
        this.enqueue(() => this.rotateCoroutine(-n));
    }

    callRotateRight(n: number) {
        if (!this.jsCallCheck(n)) return;
        this.enqueue(() => this.rotateCoroutine(n));
    }

    callJump() {
        if (this.moverRole !== 'player') return;
        if (!this.jsCallCheck(1)) return;
        this.enqueue(() => this.moveCoroutine(1, true));
    }
}