let timers = [];

export default {

    exists(key) {
        const _ = localStorage.getItem('stored_keys');
        return _ ? _.split(',')?.indexOf(key) != -1 : false;
    },

    store(key, value, duration = null) {
        if (!localStorage.getItem('stored_keys')) localStorage.setItem('stored_keys', key);
        else localStorage.setItem('stored_keys', localStorage.getItem('stored_keys') + ',' + key);

        localStorage.setItem(key, JSON.stringify(value));
        console.log('store duration', duration)
        if (duration) {
            if (timers[key]) clearTimeout(timers[key]);
            timers[key] = setTimeout(() => {
                console.log("clear cache", key)
                this.clear([key]);
            }, duration * 1000);
        }
    },

    /**
     * 
     * @param {*} key 
     * @param {*} cb 
     * @param {*} param2 force 强制更新，调用cb
     * @returns 
     */
    async getList(key, cb = null, { force = false, duration = null } = {}) {
        if (this.exists(key) && !force) {
            return JSON.parse(localStorage.getItem(key))
        } else {
            const list = await cb();
            this.store(key, list, duration);
            return list;
        }
    },

    clear(keys) {
        if (keys && keys.length) {
            let stored_keys = localStorage.getItem('stored_keys').split(',');
            keys.forEach((key) => {
                stored_keys = stored_keys.filter((item) => item != key);
            });
            localStorage.setItem('stored_keys', stored_keys);
            return;
        }
        localStorage.removeItem('stored_keys');
    },
}