import { Node, sp, Tween } from 'cc';
import { GBundle } from '../../game/ConfigRes';
import { BATTLE_HERO_BUFF_PATH } from '../../battle/res/BattleHeroResCollector';
import { BattleSpinePlayback } from '../../battle/presentation/BattleSpinePlayback';
import type { BattleBuffSkillDropTarget, CocosBagBoardView } from '../../battle/view/CocosBagBoardView';
import type { TextGrid } from '../../battle/view/TextGrid';

/** 封神榜上层预制体（字块上方） */
const UNIT_LEVEL_UP_UPPER_PREFAB_NAME = '封神榜上层';
/** 封神榜预制体（字块下方） */
const UNIT_LEVEL_UP_LOWER_PREFAB_NAME = '封神榜';
/** 上层 Spine 动画 */
const UNIT_LEVEL_UP_UPPER_ANIM_NAME = '授仙箓';
/** 下层 Spine 动画 */
const UNIT_LEVEL_UP_LOWER_ANIM_NAME = '升级效果';
/** 封神榜特效相对锚点 Y 偏移 */
const UNIT_LEVEL_UP_FX_OFFSET_Y = 20;

import type { TextGridBattleBuffFxLayer } from '../../battle/view/TextGrid';

/**
 * 封神榜（functiontype=2）：先播上层授仙箓，播完再升级（合成武将补剩余升级经验）并播下层升级效果。
 */
export class BattleGameUnitLevelUpFxPresenter {
    private _bagView: CocosBagBoardView | null = null;
    private readonly _activeFxNodes: Node[] = [];
    private _playing = false;

    /** 绑定背包视图 */
    bind(bagView: CocosBagBoardView | null, _flyLayer: Node | null | undefined): void {
        this.unbind();
        this._bagView = bagView;
    }

    /** 注销并中断全部进行中的表现 */
    unbind(): void {
        this._abortAllFx();
        this._bagView = null;
    }

    /**
     * 上层动画播完后升级，并播下层升级效果。
     * @param target 地图格 / 背包槽
     * @param levelDelta functionpar 等级增量
     * @param onApplied 升级成功并进入 CD
     */
    tryPlay(target: BattleBuffSkillDropTarget, levelDelta: number, onApplied: () => void): boolean {
        if (this._playing) return false;
        const bagView = this._bagView;
        if (!bagView) return false;
        if (!bagView.canApplyBattleBuffLevelUpTarget(target, levelDelta)) return false;

        const grid = bagView.getTextGridForDropTarget(target);
        if (!grid?.node?.isValid) {
            console.log(`[UnitLevelUpFx] 目标字块视图缺失 ${target.kind}`);
            return false;
        }

        const upperFx = this._spawnFxOnText(grid, UNIT_LEVEL_UP_UPPER_PREFAB_NAME, 'over');
        if (!upperFx) {
            console.log('[UnitLevelUpFx] 封神榜上层预制体加载失败');
            return false;
        }

        const skel = upperFx.getComponent(sp.Skeleton) ?? upperFx.getComponentInChildren(sp.Skeleton);
        if (!skel?.isValid) {
            console.log('[UnitLevelUpFx] 封神榜上层缺少 sp.Skeleton');
            this._releaseFx(upperFx);
            return false;
        }

        this._playing = true;
        BattleSpinePlayback.play(skel, UNIT_LEVEL_UP_UPPER_ANIM_NAME, {
            loop: false,
            onComplete: this._onUpperAnimComplete.bind(this, upperFx, skel, target, levelDelta, grid, onApplied),
        });
        return true;
    }

    /** 上层播完：回收上层 → 升级 → 播下层升级效果 */
    private _onUpperAnimComplete(
        upperFx: Node,
        skel: sp.Skeleton,
        target: BattleBuffSkillDropTarget,
        levelDelta: number,
        grid: TextGrid,
        onApplied: () => void,
    ): void {
        if (skel?.isValid) BattleSpinePlayback.clearPendingComplete(skel);
        this._releaseFx(upperFx);

        const bagView = this._bagView;
        if (!bagView) {
            this._playing = false;
            return;
        }
        if (!bagView.canApplyBattleBuffLevelUpTarget(target, levelDelta)) {
            console.log(`[UnitLevelUpFx] 上层动画结束时目标已不可升级 ${target.kind}`);
            this._playing = false;
            return;
        }
        if (!bagView.applyBattleBuffLevelUpTarget(target, levelDelta)) {
            console.log(`[UnitLevelUpFx] 升级失败 ${target.kind}`);
            this._playing = false;
            return;
        }

        onApplied();
        this._playLowerFx(grid);
        this._playing = false;
    }

    /** 播放下层封神榜升级效果 */
    private _playLowerFx(grid: TextGrid): void {
        if (!grid.node?.isValid) return;

        const lowerFx = this._spawnFxOnText(grid, UNIT_LEVEL_UP_LOWER_PREFAB_NAME, 'under');
        if (!lowerFx) {
            console.log('[UnitLevelUpFx] 封神榜预制体加载失败');
            return;
        }

        const skel = lowerFx.getComponent(sp.Skeleton) ?? lowerFx.getComponentInChildren(sp.Skeleton);
        if (!skel?.isValid) {
            console.log('[UnitLevelUpFx] 封神榜缺少 sp.Skeleton');
            this._releaseFx(lowerFx);
            return;
        }

        BattleSpinePlayback.play(skel, UNIT_LEVEL_UP_LOWER_ANIM_NAME, {
            loop: false,
            onComplete: this._onLowerAnimComplete.bind(this, lowerFx, skel),
        });
    }

    /** 下层播完：回收 */
    private _onLowerAnimComplete(fx: Node, skel: sp.Skeleton): void {
        if (skel?.isValid) BattleSpinePlayback.clearPendingComplete(skel);
        this._releaseFx(fx);
    }

    /** 挂到字块根节点并按层级插入 */
    private _spawnFxOnText(grid: TextGrid, prefabName: string, layer: TextGridBattleBuffFxLayer): Node | null {
        if (!grid?.node?.isValid) return null;

        let node: Node | null = null;
        try {
            node = gg.res.getNode(BATTLE_HERO_BUFF_PATH, prefabName, GBundle.BattleHero);
        } catch (e) {
            console.log('[UnitLevelUpFx] 预制体加载异常', prefabName, String(e));
            return null;
        }
        if (!node?.isValid) return null;

        grid.attachBattleBuffFx(node, layer);
        const pos = node.position;
        node.setPosition(pos.x, pos.y + UNIT_LEVEL_UP_FX_OFFSET_Y, pos.z);
        this._activeFxNodes.push(node);
        return node;
    }

    /** 回收特效节点 */
    private _releaseFx(node: Node | null): void {
        if (!node?.isValid) return;
        const idx = this._activeFxNodes.indexOf(node);
        if (idx >= 0) this._activeFxNodes.splice(idx, 1);
        Tween.stopAllByTarget(node);
        if (node['resKey']) gg.res.putNode(node);
        else node.destroy();
    }

    /** 中断并清理全部表现节点 */
    private _abortAllFx(): void {
        const pending = this._activeFxNodes.slice();
        this._activeFxNodes.length = 0;
        for (let i = 0; i < pending.length; i++) {
            const node = pending[i];
            const skel = node.getComponent(sp.Skeleton) ?? node.getComponentInChildren(sp.Skeleton);
            if (skel?.isValid) BattleSpinePlayback.clearPendingComplete(skel);
            this._releaseFx(node);
        }
        this._playing = false;
    }
}