/**
 * 小游戏宿主设备信息。
 * 微信：getSystemInfo 自 2.20.1 停维，鸿蒙 3.7.0+ 用 getDeviceInfo / getWindowInfo / getAppBaseInfo。
 * https://developers.weixin.qq.com/minigame/dev/guide/open-ability/ohos.html
 */
export type MiniGameHostApi = {
    getDeviceInfo?: () => Record<string, unknown>;
    getWindowInfo?: () => Record<string, unknown>;
    getAppBaseInfo?: () => Record<string, unknown>;
    getSystemInfoSync?: () => Record<string, unknown>;
};

/**
 * 合并新/旧宿主信息接口。appName 等字段可能只在 getSystemInfoSync / getAppBaseInfo。
 * @param api 微信 / 抖音 jsbridge
 */
export function readMiniGameHostInfo(api: MiniGameHostApi | null | undefined): Record<string, unknown> | null {
    if (!api) return null;
    const merged: Record<string, unknown> = {};
    try {
        if (typeof api.getDeviceInfo === 'function') {
            Object.assign(merged, api.getDeviceInfo() ?? {});
        }
    } catch { /* jsbridge 未就绪 */ }
    try {
        if (typeof api.getWindowInfo === 'function') {
            const win = api.getWindowInfo() ?? {};
            if (win.screenWidth != null) merged.screenWidth = win.screenWidth;
            if (win.screenHeight != null) merged.screenHeight = win.screenHeight;
            if (win.windowWidth != null) merged.windowWidth = win.windowWidth;
            if (win.windowHeight != null) merged.windowHeight = win.windowHeight;
            if (win.pixelRatio != null) {
                merged.pixelRatio = win.pixelRatio;
                merged.devicePixelRatio = win.pixelRatio;
            }
            if (win.statusBarHeight != null) merged.statusBarHeight = win.statusBarHeight;
            if (win.safeArea != null) merged.safeArea = win.safeArea;
        }
    } catch { /* jsbridge 未就绪 */ }
    try {
        if (typeof api.getAppBaseInfo === 'function') {
            const app = api.getAppBaseInfo() ?? {};
            if (app.SDKVersion != null) merged.SDKVersion = app.SDKVersion;
            if (app.language != null) merged.language = app.language;
            if (app.version != null) merged.version = app.version;
            if (app.theme != null) merged.theme = app.theme;
            if (app.enableDebug != null) merged.enableDebug = app.enableDebug;
            if (app.host != null) merged.host = app.host;
            if (app.appName != null) merged.appName = app.appName;
        }
    } catch { /* jsbridge 未就绪 */ }
    if (typeof api.getSystemInfoSync === 'function') {
        try {
            const sys = api.getSystemInfoSync() ?? {};
            if (merged.platform == null && sys.platform != null) merged.platform = sys.platform;
            if (merged.system == null && sys.system != null) merged.system = sys.system;
            if (merged.model == null && sys.model != null) merged.model = sys.model;
            if (merged.appName == null && sys.appName != null) merged.appName = sys.appName;
            if (merged.brand == null && sys.brand != null) merged.brand = sys.brand;
        } catch { /* 旧接口失败则保持已合并字段 */ }
    }
    if (!merged.platform && !merged.system && !merged.model && !merged.appName) {
        return null;
    }
    return merged;
}

/**
 * 微信鸿蒙：platform=ohos；开发者工具模拟鸿蒙 platform=devtools 且 system=HarmonyOS。
 * @param info 宿主信息
 */
export function isHarmonyHost(info: { platform?: unknown; system?: unknown } | null): boolean {
    if (!info) return false;
    const platform = String(info.platform ?? '').toLowerCase();
    const system = String(info.system ?? '').toLowerCase();
    return platform === 'ohos'
        || platform === 'ohos_pc'
        || platform === 'openharmony'
        || system.includes('harmony')
        || system.includes('openharmony');
}

/** 小游戏运行时平台（与 window 全局对象对应） */
export type MiniGamePfId = 'ks' | 'tt' | 'qg' | 'qq' | 'bl' | 'my' | 'wx';

/**
 * 运行时宿主探测。wx 必须最后，避免快手「兼容微信」时 window.wx 抢先。
 * my 在 wx 之前：支付宝全局对象是 my。
 */
export class MiniGamePf {
    /** 探测顺序：ks → tt → qg → qq → bl → my → wx */
    private static readonly _order: MiniGamePfId[] = ['ks', 'tt', 'qg', 'qq', 'bl', 'my', 'wx'];

    /** 当前平台 id；非小游戏返回 null */
    static id(): MiniGamePfId | null {
        const order = MiniGamePf._order;
        for (let i = 0; i < order.length; i++) {
            const k = order[i];
            if ((window as Record<string, unknown>)[k]) return k;
        }
        return null;
    }

    /** 当前平台全局对象 */
    static api(): Record<string, any> | null {
        const id = MiniGamePf.id();
        if (!id) return null;
        return ((window as Record<string, unknown>)[id] as Record<string, any>) ?? null;
    }

    /** 是否快手（含微信兼容包） */
    static isKs(): boolean {
        return !!(window as Record<string, unknown>)['ks'];
    }

    /** 是否 B 站小游戏 */
    static isBl(): boolean {
        return MiniGamePf.id() === 'bl';
    }

    /** 是否支付宝小游戏（全局对象 my） */
    static isMy(): boolean {
        return MiniGamePf.id() === 'my';
    }

    /** 是否走 ZYSDK 上报（抖音 / 快手 / B 站 / 微信）。支付宝不进 ZYSDK */
    static canReport(): boolean {
        const id = MiniGamePf.id();
        return id === 'tt' || id === 'ks' || id === 'bl' || id === 'wx';
    }
}