// ==UserScript==
// @name 4chan External Sounds (Gallery Fix)
// @namespace b4k
// @description Fork of 4chan External Sounds by Bakugo which works with the gallery view in 4chanX.
// @author Bakugo, elttil(Anton Kling)
// @version 1.7.0
// @match *://boards.4chan.org/*
// @match *://boards.4channel.org/*
// @run-at document-start
// @downloadURL none
// ==/UserScript==

(function() {
    var doInit;
    var doParseGalleryFile;
    var doCreatePlayer;
    var doParseFile;
    var doParseFiles;
    var doPlayFile;
    var doPlayKey;
    var doMakeKey;

    var allow;
    var players;
    var isChanX;

    allow = [
        "4cdn.org",
        "catbox.moe",
        "dmca.gripe",
        "lewd.se",
        "pomf.cat",
        "zz.ht"
    ];

    document.addEventListener(
        "DOMContentLoaded",
        function(event) {
            setTimeout(
                function() {
                    if (
                        document.body.classList.contains("ws") ||
                        document.body.classList.contains("nws")
                    ) {
                        isChanX = false;
                        doInit();
                    }
                },
                (1)
            );
        }
    );

    document.addEventListener(
        "4chanXInitFinished",
        function(event) {
            if (
                document.documentElement.classList.contains("fourchan-x") &&
                document.documentElement.classList.contains("sw-yotsuba")
            ) {
                isChanX = true;
                doInit();
            }
        }
    );

    doInit = function() {
        var observer;

        if (players) {
            return;
        }

        players = {};

        doParseFiles(document.body);

        observer =
            new MutationObserver(
                function(mutations) {
                    mutations.forEach(
                        function(mutation) {
                            if (mutation.type === "childList") {
                                mutation.addedNodes.forEach(
                                    function(node) {
                                        if (node.className === "sauce") {
                                            node = node.parentNode.parentNode.parentNode;
                                        }
                                        if (node.nodeType === Node.ELEMENT_NODE) {
                                            doParseFiles(node);
                                            doPlayFile(node);
                                        }
                                    }
                                );
                            }
                        }
                    );
                }
            );

        observer
            .observe(
                document.body, {
                    childList: true,
                    subtree: true
                }
            );
    };

    doParseGalleryFile = function(file) {
        var fileLink;
        var fileName;
        var key;
        var match;
        var player;
        var link;

        fileLink = file.querySelector(".gal-name");

        if (!fileLink) {
            return;
        }

        fileName = fileLink.download;

        if (!fileName) {
            return;
        }

        doCreatePlayer(fileName, fileLink.href);
    };

    doParseFile = function(file) {
        var fileLink;
        var fileName;
        var key;
        var match;
        var player;
        var link;

        if (!file.classList.contains("file")) {
            return;
        }

        if (isChanX) {
            fileLink = file.querySelector(".fileText .file-info > a");
        } else {
            fileLink = file.querySelector(".fileText > a");
        }

        if (!fileLink) {
            return;
        }

        if (!fileLink.href) {
            return;
        }

        fileName = null;

        if (isChanX) {
            [
                file.querySelector(".fileText .file-info .fnfull"),
                file.querySelector(".fileText .file-info > a")
            ].some(
                function(node) {
                    if (node) {
                        if (node.textContent) {
                            fileName = node.textContent;
                            return true;
                        }
                    }

                    return false;
                }
            );
        } else {
            [
                file.querySelector(".fileText"),
                file.querySelector(".fileText > a")
            ].some(
                function(node) {
                    if (node) {
                        if (node.title) {
                            fileName = node.title;
                            return true;
                        }

                        if (
                            node.tagName === "A" &&
                            node.textContent
                        ) {
                            fileName = node.textContent;
                            return true;
                        }
                    }

                    return false;
                }
            );
        }

        if (!fileName) {
            return;
        }
        doCreatePlayer(fileName, fileLink.href);
    };

    doCreatePlayer = function(fileName, fileLink) {
        var fileLink;
        var fileName;
        var key;
        var match;
        var player;
        var link;

        fileName = fileName.replace(/\-/, "/");

        key = doMakeKey(fileLink);

        if (!key) {
            return;
        }

        if (players[key]) {
            return;
        }

        match = fileName.match(/[\[\(\{](?:audio|sound)[ \=\:\|\$](.*?)[\]\)\}]/i);

        if (!match) {
            return;
        }

        link = match[1];

        if (link.includes("%")) {
            try {
                link = decodeURIComponent(link);
            } catch (error) {
                return;
            }
        }


        if (link.match(/^(https?\:)?\/\//) === null) {
            link = (location.protocol + "//" + link);
        }

        try {
            link = new URL(link);
        } catch (error) {
            return;
        }

        if (
            allow.some(
                function(item) {
                    return (
                        link.hostname.toLowerCase() === item ||
                        link.hostname.toLowerCase().endsWith("." + item)
                    );
                }
            ) == false
        ) {
            return;
        }

        player = new Audio();

        player.preload = "none";
        player.volume = 0.80;
        player.loop = true;

        player.src = link.href;

        players[key] = player;
    }

    doParseFiles = function(target) {
        target.querySelectorAll(".gal-labels")
            .forEach(
                function(file) {
                    doParseGalleryFile(file);
                }
            );
        target.querySelectorAll(".post")
            .forEach(
                function(post) {
                    if (post.parentElement.parentElement.id === "qp") {
                        return;
                    }

                    if (post.parentElement.classList.contains("noFile")) {
                        return;
                    }


                    post.querySelectorAll(".file")
                        .forEach(
                            function(file) {
                                doParseFile(file);
                            }
                        );
                }
            );
    };

    doPlayFile = function(target) {
        var key;
        var player;
        var interval;
        var fileLink;
        fileLink = target.querySelector(".gal-image > a > img");
        if (null == fileLink) {
            fileLink = target.querySelector(".gal-image > a > video");
        }
        if (null != fileLink) {
            doPlayKey(fileLink);
            return;
        }

        if (isChanX) {
            if (!(
                    target.id === "ihover" ||
                    target.className === "full-image"
                )) {
                return;
            }
        } else {
            if (!(
                    target.id === "image-hover" ||
                    target.className === "expanded-thumb" ||
                    target.className === "expandedWebm"
                )) {
                return;
            }
        }

        if (!target.src) {
            return;
        }

        doPlayKey(target);
    };

    doPlayKey = function(target) {
        var key
        var player;
        var interval;

        key = doMakeKey(target.src);
        if (!key) {
            return;
        }

        player = players[key];

        if (!player) {
            return;
        }

        if (!player.paused) {
            if (player.dataset.play == 1) {
                if (isChanX) {
                    return;
                } else {
                    player.dataset.again = 1;
                }
            } else {
                player.pause();
            }
        }

        if (player.dataset.play != 1) {
            player.dataset.play = 1;
            player.dataset.again = 0;
            player.dataset.moveTime = 0;
            player.dataset.moveLast = 0;
        }

        switch (target.tagName) {
            case "IMG":
                player.loop = true;

                if (player.dataset.again != 1) {
                    player.currentTime = 0;
                    player.play();
                }

                break;

            case "VIDEO":
                player.loop = false;
                player.currentTime = target.currentTime;
                player.play();
                break;

            default:
                return;
        }

        if (player.paused) {
            document.dispatchEvent(
                new CustomEvent(
                    "CreateNotification", {
                        bubbles: true,
                        detail: {
                            type: "warning",
                            content: "Your browser blocked autoplay, click anywhere on the page to activate it and try again.",
                            lifetime: 5
                        }
                    }
                )
            );
        }

        interval =
            setInterval(
                function() {
                    if (document.body.contains(target)) {
                        if (target.tagName === "VIDEO") {
                            if (target.currentTime != (+player.dataset.moveLast)) {
                                player.dataset.moveTime = Date.now();
                                player.dataset.moveLast = target.currentTime;
                            }

                            if (player.duration != NaN) {
                                if (
                                    target.paused == true ||
                                    target.duration == NaN ||
                                    target.currentTime > player.duration ||
                                    ((Date.now() - (+player.dataset.moveTime)) > 300)
                                ) {
                                    if (!player.paused) {
                                        player.pause();
                                    }
                                } else {
                                    if (
                                        player.paused ||
                                        Math.abs(target.currentTime - player.currentTime) > 0.100
                                    ) {
                                        player.currentTime = target.currentTime;
                                    }

                                    if (player.paused) {
                                        player.play();
                                    }
                                }
                            }
                        }
                    } else {
                        clearInterval(interval);

                        if (player.dataset.again == 1) {
                            player.dataset.again = 0;
                        } else {
                            player.pause();
                            player.dataset.play = 0;
                        }
                    }
                },
                (1000 / 30)
            );
    };


    doMakeKey = function(link) {
        var match;

        match = link.match(/\.(?:4cdn|4chan)\.org\/(.+?)\/(\d+?)\.(.+?)$/);

        if (match) {
            return (match[1] + "." + match[2]);
        }

        return null;
    };
})();