import Storage from '@converse/skeletor/src/storage.js';
import { _converse, api } from '@converse/headless/core';

export function getDefaultStore () {
    if (_converse.config.get('trusted')) {
        const is_non_persistent = api.settings.get('persistent_store') === 'sessionStorage';
        return is_non_persistent ? 'session': 'persistent';
    } else {
        return 'session';
    }
}

function storeUsesIndexedDB (store) {
    return store === 'persistent' && api.settings.get('persistent_store') === 'IndexedDB';
}

export function createStore (id, store) {
    const name = store || getDefaultStore();
    const s = _converse.storage[name];
    if (typeof s === 'undefined') {
        throw new TypeError(`createStore: Could not find store for ${id}`);
    }
    return new Storage(id, s, storeUsesIndexedDB(store));
}

export function initStorage (model, id, type) {
    const store = type || getDefaultStore();
    model.browserStorage = createStore(id, store);
    if (storeUsesIndexedDB(store)) {
        const flush = () => model.browserStorage.flush();
        window.addEventListener(_converse.unloadevent, flush);
        model.on('destroy', () => window.removeEventListener(_converse.unloadevent, flush));
        model.listenTo(_converse, 'beforeLogout', flush);
    }
}