/**
 * Hachette main content script run in all frames
 *
 * Copyright (C) 2021 Wojtek Kosior
 * Copyright (C) 2021 jahoti
 * Redistribution terms are gathered in the `copyright' file.
 */

/*
 * IMPORTS_START
 * IMPORT handle_page_actions
 * IMPORT extract_signed
 * IMPORT gen_nonce
 * IMPORT is_privileged_url
 * IMPORT mozilla_suppress_scripts
 * IMPORT is_chrome
 * IMPORT is_mozilla
 * IMPORT start_activity_info_server
 * IMPORT modify_on_the_fly
 * IMPORTS_END
 */

function accept_node(node, parent)
{
    const clone = document.importNode(node, false);
    node.hachette_corresponding = clone;
    /*
     * TODO: Stop page's own issues like "Error parsing a meta element's
     * content:" from appearing as extension's errors.
     */
    parent.hachette_corresponding.appendChild(clone);
}

if (!is_privileged_url(document.URL)) {
    /* Signature valid for half an hour. */
    const min_time = new Date().getTime() - 1800 * 1000;
    let best_result = {time: -1};
    let policy = null;
    const extracted_signatures = [];
    for (const match of document.cookie.matchAll(/hachette-(\w*)=([^;]*)/g)) {
	const new_result = extract_signed(...match.slice(1, 3));
	if (new_result.fail)
	    continue;

	extracted_signatures.push(match[1]);

	if (new_result.time < Math.max(min_time, best_result.time))
	    continue;

	/* This should succeed - it's our self-produced valid JSON. */
	const new_policy = JSON.parse(decodeURIComponent(new_result.data));
	if (new_policy.url !== document.URL)
	    continue;

	best_result = new_result;
	policy = new_policy;
    }

    if (!policy) {
	console.warn("WARNING! Using default policy!!!");
	policy = {allow: false, nonce: gen_nonce()};
    }

    for (const signature of extracted_signatures)
	document.cookie = `hachette-${signature}=; Max-Age=-1;`;

    handle_page_actions(policy.nonce);

    if (!policy.allow) {
	const old_html = document.documentElement;
	const new_html = document.createElement("html");
	old_html.replaceWith(new_html);
	old_html.hachette_corresponding = new_html;

	const modify_end =
	      modify_on_the_fly(old_html, policy, {node_eater: accept_node});
	document.addEventListener("DOMContentLoaded", modify_end);
    }

    start_activity_info_server();
}