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

    uBlock Origin - a comprehensive, efficient content blocker
    Copyright (C) 2019-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

    The scriptlets below are meant to be injected only into a
    web page context.
*/

import { registerScriptlet } from './base.js';
import { safeSelf } from './safe-self.js';

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

export function getSafeCookieValuesFn() {
    return [
        'accept', 'reject',
        'accepted', 'rejected', 'notaccepted',
        'allow', 'disallow', 'deny',
        'allowed', 'denied',
        'approved', 'disapproved',
        'checked', 'unchecked',
        'dismiss', 'dismissed',
        'enable', 'disable',
        'enabled', 'disabled',
        'essential', 'nonessential',
        'forbidden', 'forever',
        'hide', 'hidden',
        'necessary', 'required',
        'ok',
        'on', 'off',
        'true', 't', 'false', 'f',
        'yes', 'y', 'no', 'n',
    ];
}
registerScriptlet(getSafeCookieValuesFn, {
    name: 'get-safe-cookie-values.fn',
});

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

export function getAllCookiesFn() {
    return document.cookie.split(/\s*;\s*/).map(s => {
        const pos = s.indexOf('=');
        if ( pos === 0 ) { return; }
        if ( pos === -1 ) { return `${s.trim()}=`; }
        const key = s.slice(0, pos).trim();
        const value = s.slice(pos+1).trim();
        return { key, value };
    }).filter(s => s !== undefined);
}
registerScriptlet(getAllCookiesFn, {
    name: 'get-all-cookies.fn',
});

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

export function getCookieFn(
    name = ''
) {
    for ( const s of document.cookie.split(/\s*;\s*/) ) {
        const pos = s.indexOf('=');
        if ( pos === -1 ) { continue; }
        if ( s.slice(0, pos) !== name ) { continue; }
        return s.slice(pos+1).trim();
    }
}
registerScriptlet(getCookieFn, {
    name: 'get-cookie.fn',
});

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

export function setCookieFn(
    trusted = false,
    name = '',
    value = '',
    expires = '',
    path = '',
    options = {},
) {
    // https://datatracker.ietf.org/doc/html/rfc2616#section-2.2
    // https://github.com/uBlockOrigin/uBlock-issues/issues/2777
    if ( trusted === false && /[^!#$%&'*+\-.0-9A-Z[\]^_`a-z|~]/.test(name) ) {
        name = encodeURIComponent(name);
    }
    // https://datatracker.ietf.org/doc/html/rfc6265#section-4.1.1
    // The characters [",] are given a pass from the RFC requirements because
    // apparently browsers do not follow the RFC to the letter.
    if ( /[^ -:<-[\]-~]/.test(value) ) {
        value = encodeURIComponent(value);
    }

    const cookieBefore = getCookieFn(name);
    if ( cookieBefore !== undefined && options.dontOverwrite ) { return; }
    if ( cookieBefore === value && options.reload ) { return; }

    const cookieParts = [ name, '=', value ];
    if ( expires !== '' ) {
        cookieParts.push('; expires=', expires);
    }

    if ( path === '' ) { path = '/'; }
    else if ( path === 'none' ) { path = ''; }
    if ( path !== '' && path !== '/' ) { return; }
    if ( path === '/' ) {
        cookieParts.push('; path=/');
    }

    if ( trusted ) {
        if ( options.domain ) {
            cookieParts.push(`; domain=${options.domain}`);
        }
        cookieParts.push('; Secure');
    } else if ( /^__(Host|Secure)-/.test(name) ) {
        cookieParts.push('; Secure');
    }

    try {
        document.cookie = cookieParts.join('');
    } catch(_) {
    }

    const done = getCookieFn(name) === value;
    if ( done && options.reload ) {
        window.location.reload();
    }

    return done;
}
registerScriptlet(setCookieFn, {
    name: 'set-cookie.fn',
    dependencies: [
        getCookieFn,
    ],
});

/**
 * @scriptlet set-cookie
 * 
 * @description
 * Set a cookie to a safe value.
 * 
 * @param name
 * The name of the cookie to set.
 * 
 * @param value
 * The value of the cookie to set. Must be a safe value. Unsafe values will be
 * ignored and no cookie will be set. See getSafeCookieValuesFn() helper above.
 * 
 * @param [path]
 * Optional. The path of the cookie to set. Default to `/`.
 * 
 * Reference:
 * https://github.com/AdguardTeam/Scriptlets/blob/master/src/scriptlets/set-cookie.js
 * */

export function setCookie(
    name = '',
    value = '',
    path = ''
) {
    if ( name === '' ) { return; }
    const safe = safeSelf();
    const logPrefix = safe.makeLogPrefix('set-cookie', name, value, path);
    const normalized = value.toLowerCase();
    const match = /^("?)(.+)\1$/.exec(normalized);
    const unquoted = match && match[2] || normalized;
    const validValues = getSafeCookieValuesFn();
    if ( validValues.includes(unquoted) === false ) {
        if ( /^-?\d+$/.test(unquoted) === false ) { return; }
        const n = parseInt(value, 10) || 0;
        if ( n < -32767 || n > 32767 ) { return; }
    }

    const done = setCookieFn(
        false,
        name,
        value,
        '',
        path,
        safe.getExtraArgs(Array.from(arguments), 3)
    );

    if ( done ) {
        safe.uboLog(logPrefix, 'Done');
    }
}
registerScriptlet(setCookie, {
    name: 'set-cookie.js',
    world: 'ISOLATED',
    dependencies: [
        getSafeCookieValuesFn,
        safeSelf,
        setCookieFn,
    ],
});

// For compatibility with AdGuard
export function setCookieReload(name, value, path, ...args) {
    setCookie(name, value, path, 'reload', '1', ...args);
}
registerScriptlet(setCookieReload, {
    name: 'set-cookie-reload.js',
    world: 'ISOLATED',
    dependencies: [
        setCookie,
    ],
});

/**
 * @trustedScriptlet trusted-set-cookie
 * 
 * @description
 * Set a cookie to any value. This scriptlet can be used only from a trusted
 * source.
 * 
 * @param name
 * The name of the cookie to set.
 * 
 * @param value
 * The value of the cookie to set. Must be a safe value. Unsafe values will be
 * ignored and no cookie will be set. See getSafeCookieValuesFn() helper above.
 * 
 * @param [offsetExpiresSec]
 * Optional. The path of the cookie to set. Default to `/`.
 * 
 * @param [path]
 * Optional. The path of the cookie to set. Default to `/`.
 * 
 * Reference:
 * https://github.com/AdguardTeam/Scriptlets/blob/master/src/scriptlets/set-cookie.js
 * */

export function trustedSetCookie(
    name = '',
    value = '',
    offsetExpiresSec = '',
    path = ''
) {
    if ( name === '' ) { return; }

    const safe = safeSelf();
    const logPrefix = safe.makeLogPrefix('set-cookie', name, value, path);
    const time = new Date();

    if ( value.includes('$now$') ) {
        value = value.replaceAll('$now$', time.getTime());
    }
    if ( value.includes('$currentDate$') ) {
        value = value.replaceAll('$currentDate$', time.toUTCString());
    }
    if ( value.includes('$currentISODate$') ) {
        value = value.replaceAll('$currentISODate$', time.toISOString());
    }

    let expires = '';
    if ( offsetExpiresSec !== '' ) {
        if ( offsetExpiresSec === '1day' ) {
            time.setDate(time.getDate() + 1);
        } else if ( offsetExpiresSec === '1year' ) {
            time.setFullYear(time.getFullYear() + 1);
        } else {
            if ( /^\d+$/.test(offsetExpiresSec) === false ) { return; }
            time.setSeconds(time.getSeconds() + parseInt(offsetExpiresSec, 10));
        }
        expires = time.toUTCString();
    }

    const done = setCookieFn(
        true,
        name,
        value,
        expires,
        path,
        safeSelf().getExtraArgs(Array.from(arguments), 4)
    );

    if ( done ) {
        safe.uboLog(logPrefix, 'Done');
    }
}
registerScriptlet(trustedSetCookie, {
    name: 'trusted-set-cookie.js',
    requiresTrust: true,
    world: 'ISOLATED',
    dependencies: [
        safeSelf,
        setCookieFn,
    ],
});

// For compatibility with AdGuard
export function trustedSetCookieReload(name, value, offsetExpiresSec, path, ...args) {
    trustedSetCookie(name, value, offsetExpiresSec, path, 'reload', '1', ...args);
}
registerScriptlet(trustedSetCookieReload, {
    name: 'trusted-set-cookie-reload.js',
    requiresTrust: true,
    world: 'ISOLATED',
    dependencies: [
        trustedSetCookie,
    ],
});

/**
 * @scriptlet remove-cookie
 * 
 * @description
 * Removes current site cookies specified by name. The removal operation occurs
 * immediately when the scriptlet is injected, then when the page is unloaded.
 * 
 * @param needle
 * A string or a regex matching the name of the cookie(s) to remove.
 * 
 * @param ['when', token]
 * Vararg, optional. The parameter following 'when' tells when extra removal
 * operations should take place.
 * - `scroll`: when the page is scrolled
 * - `keydown`: when a keyboard touch is pressed
 * 
 * */

export function removeCookie(
    needle = ''
) {
    if ( typeof needle !== 'string' ) { return; }
    const safe = safeSelf();
    const reName = safe.patternToRegex(needle);
    const extraArgs = safe.getExtraArgs(Array.from(arguments), 1);
    const throttle = (fn, ms = 500) => {
        if ( throttle.timer !== undefined ) { return; }
        throttle.timer = setTimeout(( ) => {
            throttle.timer = undefined;
            fn();
        }, ms);
    };
    const remove = ( ) => {
        document.cookie.split(';').forEach(cookieStr => {
            const pos = cookieStr.indexOf('=');
            if ( pos === -1 ) { return; }
            const cookieName = cookieStr.slice(0, pos).trim();
            if ( reName.test(cookieName) === false ) { return; }
            const part1 = cookieName + '=';
            const part2a = '; domain=' + document.location.hostname;
            const part2b = '; domain=.' + document.location.hostname;
            let part2c, part2d;
            const domain = document.domain;
            if ( domain ) {
                if ( domain !== document.location.hostname ) {
                    part2c = '; domain=.' + domain;
                }
                if ( domain.startsWith('www.') ) {
                    part2d = '; domain=' + domain.replace('www', '');
                }
            }
            const part3 = '; path=/';
            const part4 = '; Max-Age=-1000; expires=Thu, 01 Jan 1970 00:00:00 GMT';
            document.cookie = part1 + part4;
            document.cookie = part1 + part2a + part4;
            document.cookie = part1 + part2b + part4;
            document.cookie = part1 + part3 + part4;
            document.cookie = part1 + part2a + part3 + part4;
            document.cookie = part1 + part2b + part3 + part4;
            if ( part2c !== undefined ) {
                document.cookie = part1 + part2c + part3 + part4;
            }
            if ( part2d !== undefined ) {
                document.cookie = part1 + part2d + part3 + part4;
            }
        });
    };
    remove();
    window.addEventListener('beforeunload', remove);
    if ( typeof extraArgs.when !== 'string' ) { return; }
    const supportedEventTypes = [ 'scroll', 'keydown' ];
    const eventTypes = extraArgs.when.split(/\s/);
    for ( const type of eventTypes ) {
        if ( supportedEventTypes.includes(type) === false ) { continue; }
        document.addEventListener(type, ( ) => {
            throttle(remove);
        }, { passive: true });
    }
}
registerScriptlet(removeCookie, {
    name: 'remove-cookie.js',
    aliases: [
        'cookie-remover.js',
    ],
    world: 'ISOLATED',
    dependencies: [
        safeSelf,
    ],
});

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