/*******************************************************************************

    uBlock Origin Lite - a comprehensive, MV3-compliant content blocker
    Copyright (C) 2022-present Raymond Hill

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see {http://www.gnu.org/licenses/}.

    Home: https://github.com/gorhill/uBlock
*/

import { webext } from './ext-compat.js';

/******************************************************************************/

export const browser = webext;
export const i18n = browser.i18n;
export const runtime = browser.runtime;

export const webextFlavor = (( ) => {
    const extURL = runtime.getURL('');
    if ( extURL.startsWith('safari-web-extension:') ) { return 'safari'; }
    return extURL.startsWith('moz-extension:') ? 'firefox' : 'chromium';
})();

const notAnObject = a => typeof a !== 'object' || a === null;

export const supportsUserScripts = (() => {
    if ( browser.offscreen === undefined ) { return false; }
    try { browser.userScripts.getScripts(); }
    catch { return false; }
    return true;
})();

/******************************************************************************/

// The extension's service worker can be evicted at any time, so when we
// send a message, we try a few more times when the message fails to be sent.

export function sendMessage(msg) {
    return runtime.sendMessage(msg).catch(reason => {
        console.log(reason);
    });
}

/******************************************************************************/

export async function localRead(key) {
    if ( notAnObject(browser?.storage?.local) ) { return; }
    try {
        const bin = await browser.storage.local.get(key);
        if ( notAnObject(bin) ) { return; }
        return bin[key] ?? undefined;
    } catch {
    }
}

export async function localWrite(key, value) {
    if ( notAnObject(browser?.storage?.local) ) { return; }
    return browser.storage.local.set({ [key]: value });
}

export async function localRemove(keys) {
    if ( notAnObject(browser?.storage?.local) ) { return; }
    return browser.storage.local.remove(keys);
}

export async function localKeys() {
    if ( notAnObject(browser?.storage?.local) ) { return; }
    if ( browser.storage.local.getKeys ) {
        return browser.storage.local.getKeys();
    }
    const bin = await browser.storage.local.get(null);
    if ( notAnObject(bin) ) { return; }
    return Object.keys(bin);
}

/******************************************************************************/

export async function sessionRead(key) {
    if ( notAnObject(browser?.storage?.session) ) { return; }
    try {
        const bin = await browser.storage.session.get(key);
        if ( notAnObject(bin) ) { return; }
        return bin[key] ?? undefined;
    } catch {
    }
}

export async function sessionWrite(key, value) {
    if ( notAnObject(browser?.storage?.session) ) { return; }
    return browser.storage.session.set({ [key]: value });
}

export async function sessionRemove(keys) {
    if ( notAnObject(browser?.storage?.session) ) { return; }
    return browser.storage.session.remove(keys);
}

export async function sessionKeys() {
    if ( notAnObject(browser?.storage?.session) ) { return; }
    if ( browser.storage.session.getKeys ) {
        return browser.storage.session.getKeys();
    }
    const bin = await browser.storage.session.get(null);
    if ( notAnObject(bin) ) { return; }
    return Object.keys(bin);
}

export async function sessionAccessLevel(level) {
    try {
        browser.storage.session.setAccessLevel(level);
    } catch {
    }
    
}

/******************************************************************************/

export async function adminRead(key) {
    if ( browser?.storage?.managed instanceof Object === false ) { return; }
    try {
        const bin = await browser.storage.managed.get(key);
        if ( notAnObject(bin) ) { return; }
        return bin[key] ?? undefined;
    } catch {
    }
}

/******************************************************************************/
