import { Component, Node, sp } from 'cc';
import { ensureSpineSkeletonDataRuntime } from 'db://assets/mx/module/lang/spineRuntimePatch';

/** 首页场景节点名 */
const NODE_SCENE = '首页场景';
/** 首页数字节点名 */
const NODE_NUM = '首页数字';
/** 数字待机动画 */
const ANIM_IDLE = '待机';
/** 数字场景变换动画 */
const ANIM_SWITCH = '场景变换';
/** 变换动画内切场景的事件名 */
const EVENT_SWITCH = '开始渐隐变换场景';
/** 场景皮肤列表 */
const SCENE_SKINS = ['初始', '熔浆', '覆水', '雪地'] as const;
/** 切换间隔下限（秒） */
const INTERVAL_MIN = 3;
/** 切换间隔上限（秒） */
const INTERVAL_MAX = 5;

/**
 * 首页场景皮肤随机切换：间隔 3~5 秒，播「场景变换」，在事件帧切皮肤，播完回待机。
 */
export class PanelHomeSceneSwitchPresenter {
    private _host: Component | null = null;
    private _levelSelect: Node | null = null;
    private _sceneSkel: sp.Skeleton | null = null;
    private _numSkel: sp.Skeleton | null = null;
    private _skinIndex = 0;
    private _switching = false;

    /**
     * 绑定宿主与 ui_levelSelect，解析 Spine 并开局待机。
     * @param host 用于 schedule 的组件（PanelHome）
     * @param levelSelect ui_levelSelect
     */
    bind(host: Component | null | undefined, levelSelect: Node | null | undefined): void {
        this.unbind();
        if (!host?.isValid || !levelSelect?.isValid) {
            console.log('[PanelHomeSceneSwitch] 绑定参数无效');
            return;
        }
        this._host = host;
        this._levelSelect = levelSelect;
        this._sceneSkel = this._resolveSkel(NODE_SCENE);
        this._numSkel = this._resolveSkel(NODE_NUM);
        if (!this._sceneSkel || !this._numSkel) return;
        this._skinIndex = this._resolveCurrentSkinIndex(this._sceneSkel);
        this._playIdle();
        this._scheduleNext();
    }

    /** 停止定时与切换，解除引用 */
    unbind(): void {
        this._switching = false;
        const host = this._host;
        if (host?.isValid) {
            host.unschedule(this._onInterval);
            host.unschedule(this._onSwitchEvent);
            host.unschedule(this._onSwitchAnimDone);
        }
        this._host = null;
        this._levelSelect = null;
        this._sceneSkel = null;
        this._numSkel = null;
    }

    /** 解析子节点 Spine */
    private _resolveSkel(name: string): sp.Skeleton | null {
        const root = this._levelSelect;
        if (!root?.isValid) return null;
        const node = root.getChildByName(name);
        if (!node?.isValid) {
            console.log('[PanelHomeSceneSwitch] 节点缺失', name);
            return null;
        }
        const skel = node.getComponent(sp.Skeleton);
        if (!skel) {
            console.log('[PanelHomeSceneSwitch] 缺少 sp.Skeleton', name);
            return null;
        }
        if (skel.skeletonData) {
            ensureSpineSkeletonDataRuntime(skel.skeletonData);
        }
        return skel;
    }

    /** 读 Inspector defaultSkin 在列表中的下标；未知则 0 */
    private _resolveCurrentSkinIndex(skel: sp.Skeleton): number {
        const cur = String((skel as sp.Skeleton & { defaultSkin?: string }).defaultSkin ?? '').trim();
        for (let i = 0; i < SCENE_SKINS.length; i++) {
            if (SCENE_SKINS[i] === cur) return i;
        }
        console.log('[PanelHomeSceneSwitch] 当前皮肤不在列表，按初始处理', cur);
        return 0;
    }

    /** 数字播待机循环 */
    private _playIdle(): void {
        const num = this._numSkel;
        if (!num?.isValid) return;
        if (num.skeletonData) ensureSpineSkeletonDataRuntime(num.skeletonData);
        if (!num.findAnimation(ANIM_IDLE)) {
            console.log('[PanelHomeSceneSwitch] 缺少动画', ANIM_IDLE);
            return;
        }
        num.setAnimation(0, ANIM_IDLE, true);
    }

    /** 随机 3~5 秒后再切 */
    private _scheduleNext(): void {
        const host = this._host;
        if (!host?.isValid) return;
        host.unschedule(this._onInterval);
        const delay = INTERVAL_MIN + Math.random() * (INTERVAL_MAX - INTERVAL_MIN);
        host.scheduleOnce(this._onInterval, delay);
    }

    /** 读动画事件时刻（秒）；无则 null */
    private _findAnimEventTime(skel: sp.Skeleton, animName: string, eventName: string): number | null {
        if (!skel?.isValid || !animName || !eventName) return null;
        const sd = skel.skeletonData as sp.SkeletonData & { skeletonJson?: unknown; _skeletonJson?: unknown };
        if (!sd?.isValid) return null;
        try {
            ensureSpineSkeletonDataRuntime(sd);
            const raw = (sd.skeletonJson ?? sd._skeletonJson) as {
                animations?: Record<string, { events?: Array<{ time?: number; name?: string }> }>;
            } | null;
            const events = raw?.animations?.[animName]?.events;
            if (!events || events.length === 0) return null;
            for (let i = 0; i < events.length; i++) {
                const e = events[i];
                if (String(e?.name ?? '') !== eventName) continue;
                const t = Number(e.time);
                if (!Number.isFinite(t) || t < 0) continue;
                return t;
            }
            return null;
        } catch {
            return null;
        }
    }

    /** 间隔到：播场景变换，事件帧切皮，播完回待机 */
    private _onInterval = (): void => {
        if (this._switching) return;
        const num = this._numSkel;
        const host = this._host;
        if (!num?.isValid || !host?.isValid) return;
        if (num.skeletonData) ensureSpineSkeletonDataRuntime(num.skeletonData);
        const anim = num.findAnimation(ANIM_SWITCH);
        if (!anim) {
            console.log('[PanelHomeSceneSwitch] 缺少动画', ANIM_SWITCH);
            this._scheduleNext();
            return;
        }
        const eventTime = this._findAnimEventTime(num, ANIM_SWITCH, EVENT_SWITCH);
        if (eventTime == null) {
            console.log('[PanelHomeSceneSwitch] 缺少事件帧', EVENT_SWITCH, ANIM_SWITCH);
            this._scheduleNext();
            return;
        }
        const duration = Number(anim.duration);
        const scale = Math.max(0.01, num.timeScale || 1);
        const eventDelay = eventTime / scale;
        const doneDelay = (Number.isFinite(duration) && duration > 0 ? duration : eventTime) / scale;
        this._switching = true;
        num.setAnimation(0, ANIM_SWITCH, false);
        host.unschedule(this._onSwitchEvent);
        host.unschedule(this._onSwitchAnimDone);
        host.scheduleOnce(this._onSwitchEvent, eventDelay);
        host.scheduleOnce(this._onSwitchAnimDone, Math.max(eventDelay, doneDelay));
    };

    /** 事件帧：随机其他皮肤 */
    private _onSwitchEvent = (): void => {
        if (!this._switching) return;
        const scene = this._sceneSkel;
        if (!scene?.isValid) return;
        const next = this._pickOtherSkinIndex(this._skinIndex);
        const skin = SCENE_SKINS[next];
        if (scene.skeletonData) ensureSpineSkeletonDataRuntime(scene.skeletonData);
        try {
            (scene as sp.Skeleton & { defaultSkin: string }).defaultSkin = skin;
            scene.setSkin(skin);
            scene.setSlotsToSetupPose();
            this._skinIndex = next;
        } catch (err) {
            console.log('[PanelHomeSceneSwitch] setSkin 失败', skin, err);
        }
    };

    /** 变换播完：回待机并排下次 */
    private _onSwitchAnimDone = (): void => {
        if (!this._switching) return;
        this._switching = false;
        this._playIdle();
        this._scheduleNext();
    };

    /** 从当前以外的 3 个皮肤中随机下标 */
    private _pickOtherSkinIndex(cur: number): number {
        const others: number[] = [];
        for (let i = 0; i < SCENE_SKINS.length; i++) {
            if (i !== cur) others.push(i);
        }
        if (others.length === 0) return cur;
        return others[Math.floor(Math.random() * others.length)];
    }
}