// client/src/stores/pwa.js — PWA 状态：更新提示 / 安装提示 / 离线
import { defineStore } from 'pinia';
import { ref, computed } from 'vue';

export const usePwaStore = defineStore('pwa', () => {
    /** true = 已有新版本 SW 等激活，需要刷新 */
    const needRefresh = ref(false);
    /** true = 资源已缓存完，可离线用 */
    const offlineReady = ref(false);
    /** 浏览器/桌面触发安装的事件（Android/Desktop Chrome） */
    const installPromptEvent = ref(null);
    /** 已安装（standalone 模式运行） */
    const isInstalled = computed(() => {
        if (typeof window === 'undefined') return false;
        return (
            window.matchMedia('(display-mode: standalone)').matches ||
            window.navigator.standalone === true // iOS Safari
        );
    });
    /** iOS 设备 + Safari + 未安装 → 引导走"分享 → 添加到主屏幕" */
    const isIosSafari = computed(() => {
        if (typeof window === 'undefined') return false;
        const ua = window.navigator.userAgent;
        return /iPad|iPhone|iPod/.test(ua) && /Safari/.test(ua) && !/CriOS|FxiOS|EdgiOS/.test(ua);
    });

    let updateFn = null;

    function bindRegisterSw(registerFn) {
        updateFn = registerFn;
    }

    function triggerNeedRefresh() {
        needRefresh.value = true;
    }
    function triggerOfflineReady() {
        offlineReady.value = true;
        // 5s 后自动收起
        setTimeout(() => (offlineReady.value = false), 5000);
    }
    async function applyUpdate() {
        if (updateFn) {
            await updateFn(true);
            needRefresh.value = false;
        } else {
            window.location.reload();
        }
    }
    function dismissNeedRefresh() {
        needRefresh.value = false;
    }
    function dismissOfflineReady() {
        offlineReady.value = false;
    }
    async function promptInstall() {
        const e = installPromptEvent.value;
        if (!e) return false;
        e.prompt();
        const choice = await e.userChoice;
        installPromptEvent.value = null;
        return choice.outcome === 'accepted';
    }
    function captureInstallPrompt(e) {
        e.preventDefault();
        installPromptEvent.value = e;
    }
    // 全局监听 beforeinstallprompt
    if (typeof window !== 'undefined') {
        window.addEventListener('beforeinstallprompt', captureInstallPrompt);
        window.addEventListener('appinstalled', () => {
            installPromptEvent.value = null;
        });
    }

    return {
        needRefresh,
        offlineReady,
        installPromptEvent,
        isInstalled,
        isIosSafari,
        bindRegisterSw,
        triggerNeedRefresh,
        triggerOfflineReady,
        applyUpdate,
        dismissNeedRefresh,
        dismissOfflineReady,
        promptInstall,
    };
});