import { SpriteFrame, Texture2D, ImageAsset, assetManager } from 'cc';
import { HttpUtil } from './HttpUtil';
import { WxSDK } from './WxSDK';
import { API_ENDPOINTS, getShareDetailUrl, getShareJoinUrl, getShareSubmitUrl, API_TIMEOUT } from '../config/ApiConfig';
import {
    ApiEnvelope,
    CreateShareData,
    JoinShareData,
    ShareLevelData,
    CreatedShareItem,
    CreatedShareListData,
    ParticipatedShareItem,
    ParticipatedShareListData,
    ShareDetailData,
    SubmitShareData,
    SubmitShareLevel,
} from '../types/ApiTypes';
import { RuntimeLevelConfig } from '../types/LevelTypes';

/**
 * 分享管理器
 * 负责创建分享、加入分享、缓存分享关卡数据
 */
export class ShareManager {
    private static _instance: ShareManager | null = null;

    /** 分享模式的关卡数据（null 表示正常模式） */
    private _shareLevels: RuntimeLevelConfig[] | null = null;

    /** API 返回的原始关卡数据（保留 image1Url/image2Url 用于懒加载） */
    private _shareApiLevels: ShareLevelData[] = [];

    private _shareTitle: string = '';
    private _shareCode: string | null = null;
    private _createdShares: CreatedShareItem[] = [];
    private _participatedShares: ParticipatedShareItem[] = [];

    /** 图片缓存：URL -> SpriteFrame */
    private _imageCache: Map<string, SpriteFrame> = new Map();

    static get instance(): ShareManager {
        if (!this._instance) {
            this._instance = new ShareManager();
        }
        return this._instance;
    }

    private constructor() {}

    get isShareMode(): boolean {
        return this._shareLevels !== null && this._shareLevels.length > 0;
    }

    get createdShares(): CreatedShareItem[] {
        return [...this._createdShares];
    }

    get participatedShares(): ParticipatedShareItem[] {
        return [...this._participatedShares];
    }

    get shareCode(): string | null {
        return this._shareCode;
    }

    get shareTitle(): string {
        return this._shareTitle;
    }

    async createShare(title: string, levelIds: string[]): Promise<string | null> {
        try {
            const response = await HttpUtil.post<ApiEnvelope<CreateShareData>>(
                API_ENDPOINTS.SHARE_CREATE,
                { title, levelIds },
                API_TIMEOUT.DEFAULT,
            );

            if (!response.success || !response.data) {
                console.error('[ShareManager] 创建分享失败:', response.message);
                return null;
            }

            return response.data.shareCode;
        } catch (err) {
            console.error('[ShareManager] 创建分享异常:', err);
            return null;
        }
    }

    async joinShare(code: string): Promise<boolean> {
        try {
            const response = await HttpUtil.post<ApiEnvelope<JoinShareData>>(
                getShareJoinUrl(code),
                {},
                API_TIMEOUT.DEFAULT,
            );

            if (!response.success || !response.data) {
                console.error('[ShareManager] 加入分享失败:', response.message);
                return false;
            }

            const { shareCode, title, levels } = response.data;
            this._shareCode = shareCode;
            this._shareTitle = title;
            this._shareApiLevels = levels;

            const runtimeLevels: RuntimeLevelConfig[] = levels.map((level) => ({
                id: level.id,
                name: `第${level.level}关`,
                spriteFrame1: null,
                spriteFrame2: null,
                image1Description: level.image1Description,
                image2Description: level.image2Description,
                punchline: level.punchline,
                clue1: level.hint1,
                clue2: level.hint2,
                clue3: level.hint3,
                answer: level.answer,
                completed: false,
                timeLimit: null,
            }));

            // 预加载首关图片（两张并行加载）
            if (levels.length > 0) {
                const [sf1, sf2] = await Promise.all([
                    this._loadImage(levels[0].image1Url),
                    this._loadImage(levels[0].image2Url),
                ]);
                if (sf1) {
                    runtimeLevels[0].spriteFrame1 = sf1;
                }
                if (sf2) {
                    runtimeLevels[0].spriteFrame2 = sf2;
                }
            }

            this._shareLevels = runtimeLevels;
            console.log(`[ShareManager] 加入分享成功: ${title}, ${levels.length} 关`);
            return true;
        } catch (err) {
            console.error('[ShareManager] 加入分享异常:', err);
            return false;
        }
    }

    async fetchCreatedShares(): Promise<CreatedShareItem[] | null> {
        try {
            const response = await HttpUtil.get<ApiEnvelope<CreatedShareListData>>(
                API_ENDPOINTS.SHARE_CREATED,
                API_TIMEOUT.DEFAULT,
            );

            if (!response.success || !response.data) {
                console.error('[ShareManager] 获取我创建的挑战列表失败:', response.message);
                return null;
            }

            this._createdShares = response.data.items ?? [];
            console.log(`[ShareManager] 获取我创建的挑战列表成功: ${this._createdShares.length} 条`);
            return this.createdShares;
        } catch (err) {
            console.error('[ShareManager] 获取我创建的挑战列表异常:', err);
            return null;
        }
    }

    async fetchParticipatedShares(): Promise<ParticipatedShareItem[] | null> {
        try {
            const response = await HttpUtil.get<ApiEnvelope<ParticipatedShareListData>>(
                API_ENDPOINTS.SHARE_PARTICIPATED,
                API_TIMEOUT.DEFAULT,
            );

            if (!response.success || !response.data) {
                console.error('[ShareManager] 获取我参与的挑战列表失败:', response.message);
                return null;
            }

            this._participatedShares = response.data.items ?? [];
            console.log(`[ShareManager] 获取我参与的挑战列表成功: ${this._participatedShares.length} 条`);
            return this.participatedShares;
        } catch (err) {
            console.error('[ShareManager] 获取我参与的挑战列表异常:', err);
            return null;
        }
    }

    async fetchShareDetail(code: string): Promise<ShareDetailData | null> {
        try {
            const response = await HttpUtil.get<ApiEnvelope<ShareDetailData>>(
                getShareDetailUrl(code),
                API_TIMEOUT.DEFAULT,
            );

            if (!response.success || !response.data) {
                console.error('[ShareManager] 获取分享挑战详情失败:', response.message);
                return null;
            }

            console.log(`[ShareManager] 获取分享挑战详情成功: ${response.data.title}, ${response.data.rankings?.length ?? 0} 条排行`);
            return response.data;
        } catch (err) {
            console.error('[ShareManager] 获取分享挑战详情异常:', err);
            return null;
        }
    }

    async ensureShareLevelReady(index: number): Promise<RuntimeLevelConfig | null> {
        if (!this._shareLevels || index < 0 || index >= this._shareLevels.length) {
            return null;
        }

        const config = this._shareLevels[index];
        if (config.spriteFrame1) {
            return config;
        }

        const apiLevel = this._shareApiLevels[index];
        if (apiLevel?.image1Url) {
            const [sf1, sf2] = await Promise.all([
                this._loadImage(apiLevel.image1Url),
                this._loadImage(apiLevel.image2Url),
            ]);
            if (sf1) {
                config.spriteFrame1 = sf1;
            }
            if (sf2) {
                config.spriteFrame2 = sf2;
            }
        }

        return config;
    }

    getShareLevelCount(): number {
        return this._shareLevels?.length ?? 0;
    }

    getShareLevelIds(): string[] {
        return this._shareApiLevels.map(level => level.id);
    }

    async submitShareChallenge(levels: SubmitShareLevel[]): Promise<SubmitShareData | null> {
        if (!this._shareCode) {
            console.warn('[ShareManager] submitShareChallenge: 无分享码，跳过提交');
            return null;
        }

        try {
            const response = await HttpUtil.post<ApiEnvelope<SubmitShareData>>(
                getShareSubmitUrl(this._shareCode),
                { levels },
                API_TIMEOUT.DEFAULT,
            );

            if (!response.success || !response.data) {
                console.error('[ShareManager] 提交挑战结果失败:', response.message);
                return null;
            }

            console.log(
                `[ShareManager] 提交挑战结果成功: rank=${response.data.rank}, correct=${response.data.correctCount}/${response.data.levelCount}`,
            );
            return response.data;
        } catch (err) {
            console.error('[ShareManager] 提交挑战结果异常:', err);
            return null;
        }
    }

    triggerWxShare(title: string, shareCode: string): void {
        WxSDK.shareAppMessage({
            title: title || '来挑战我出的谐音梗吧！',
            query: `shareCode=${shareCode}`,
        });
    }

    clearShareMode(): void {
        this._shareLevels = null;
        this._shareApiLevels = [];
        this._shareTitle = '';
        this._shareCode = null;
        this._imageCache.clear();
    }

    private _loadImage(url: string): Promise<SpriteFrame | null> {
        const cached = this._imageCache.get(url);
        if (cached) {
            return Promise.resolve(cached);
        }

        return new Promise((resolve) => {
            assetManager.loadRemote<ImageAsset>(url, (err, imageAsset) => {
                if (err) {
                    console.error('[ShareManager] 加载图片失败:', url, err);
                    resolve(null);
                    return;
                }
                const texture = new Texture2D();
                texture.image = imageAsset;
                const spriteFrame = new SpriteFrame();
                spriteFrame.texture = texture;
                this._imageCache.set(url, spriteFrame);
                resolve(spriteFrame);
            });
        });
    }
}