(function () {
    function markdownEscape(text) {
        return text.replace(/\s+/g, " ")
            /*.replace(/[\\\-*_>#]/g, "\\$&");*/
            .replace(/[\\*>#]/g, "\\$&");
    }

    function repeat(str, times) {
        return (new Array(times + 1)).join(str);
    }

    function childsToMarkdown(tree, mode) {
        var res = "";
        for (let i = 0, l = tree.childNodes.length; i < l; ++i) {
            res += nodeToMarkdown(tree.childNodes[i], mode);
        }
        return res;
    }

    function nodeToMarkdown(tree, mode) {
        let nl = "\n\n";

        if (tree.nodeType == 3) { // Text node
            return markdownEscape(tree.nodeValue);
        }
        else if (tree.nodeType == 1) {
            if (mode == "block") {
                switch (tree.tagName.toLowerCase()) {
                    case "br":
                        return nl;

                    case "hr":
                        return nl + "---" + nl;

                    // Block container elements
                    case "p":
                    case "div":
                    case "section":
                    case "address":
                    case "center":
                        return nl + childsToMarkdown(tree, "block") + nl;

                    case "ul":
                        return nl + childsToMarkdown(tree, "u") + nl;

                    case "ol":
                        return nl + childsToMarkdown(tree, "o") + nl;

                    case "pre":
                        return nl + "    " + childsToMarkdown(tree, "inline") + nl;

                    case "code":
                        if (tree.childNodes.length == 1) {
                            break; // use the inline format
                        }
                        return nl + "    " + childsToMarkdown(tree, "inline") + nl;

                    case "h1":
                    case "h2":
                    case "h3":
                    case "h4":
                    case "h5":
                    case "h6":
                    case "h7":
                        return nl + repeat("#", Number(tree.tagName[1])) + "  " + childsToMarkdown(tree, "inline") + nl;

                    case "blockquote":
                        return nl + "> " + childsToMarkdown(tree, "inline") + nl;
                }
            }

            if (/^[ou]+$/.test(mode)) {
                if (tree.tagName == "LI") {
                    return "\n" + repeat("  ", mode.length - 1) + (mode[mode.length - 1] == "o" ? "1. " : "- ") + childsToMarkdown(tree, mode + "l");
                }
                else {
                    console.log("[toMarkdown] - invalid     element at this point " + mode.tagName);
                    return childsToMarkdown(tree, "inline");
                }
            }
            else if (/^[ou]+l$/.test(mode)) {
                if (tree.tagName == "UL") {
                    return childsToMarkdown(tree, mode.substr(0, mode.length - 1) + "u");
                }
                else if (tree.tagName == "OL") {
                    return childsToMarkdown(tree, mode.substr(0, mode.length - 1) + "o");
                }
            }

            // Inline tags
            switch (tree.tagName.toLowerCase()) {
                case "strong":
                case "b":
                    return "**" + childsToMarkdown(tree, "inline") + "**";
                case "em":
                case "i":
                    return "_" + childsToMarkdown(tree, "inline") + "_";
                case "code": // Inline version of code
                    return "`" + childsToMarkdown(tree, "inline") + "`";
                case "a":
                    return "[" + childsToMarkdown(tree, "inline") + "](" + tree.getAttribute("href") + ")";
                case "img":
                    return nl + "[_Image_: " + markdownEscape(tree.getAttribute("alt")) + "](" + tree.getAttribute("src") + ")" + nl;
                case "script":
                case "style":
                case "meta":
                    return "";
                default:
                    console.log("[toMarkdown] - undefined element " + tree.tagName);
                    return childsToMarkdown(tree, mode);
            }

        }
    }

    function toMarkdown(node) {
        return nodeToMarkdown(node, "block")
            .replace(/[\n]{2,}/g, "\n\n")
            .replace(/^[\n]+/, "")
            .replace(/[\n]+$/, "");
    }


    function main() {
        const separator = '\n------------\n';

        let markdownLines = [];
        const messages = document.querySelectorAll('div.group');


        function parseAnswerChild(child) {
            let s = '';

            switch (child.localName) {
                case "p":
                    const img = child.querySelector("img");

                    if (img) {
                        const altText = img.alt || "";
                        const url = img.src || "";
                        const title = img.title || "";
                        s += `![${altText}](${url} "${title}")\n`;
                    }
                    else {
                        s += toMarkdown(child);
                        /* let html = child.innerHTML; s += html; */
                    }
                    break;

                case "pre":
                    const lang = child.querySelector("span") ? child.querySelector("span").innerHTML : "";

                    let code = '';
                    code = code.replace(/<[^>]*>/g, "");
                    code = child.querySelector("code") ? child.querySelector("code").textContent : "";

                    s += "\n```" + lang + "\n" + code + "```\n";

                    break;

                case "ol":
                    const liElements = child.querySelectorAll("li");
                    for (let i = 0; i < liElements.length; i++) {
                        s += `${i + 1}. ${liElements[i].textContent}\n`;
                    }
                    break;

                case "table":
                    const headers = [...child.querySelectorAll("th")].map(header => header.textContent.trim());
                    const rows = [...child.querySelectorAll("tbody tr")].map(row => [...row.querySelectorAll("td")].map(cell => cell.textContent.trim()));

                    const markdownTable = [headers, ...rows]
                        .map((row, index) => {
                            if (index === 0) {
                                return `| ${row.join(" | ")} |\n|${row.map(() => "-----")
                                    .join("|")}|`;
                            }
                            return `| ${row.join(" | ")} |`;
                        })
                        .join("\n");

                    s += markdownTable + "\n";
                    break;

                default:
                    s += child.innerHTML + "\n";
            }

            return s;
        }


        function parseMessage(group) {
            if (group.classList.contains('dark:bg-gray-800')) {
                const question = '# ' + group.innerText.trim() + '\n\n';
                markdownLines.push(question);
            }
            else {
                let markdownAnswer = '';

                const allAnswerChildren = group.querySelectorAll('.prose > *');

                allAnswerChildren.forEach(function (child) {
                    markdownAnswer += parseAnswerChild(child) + '\n';
                });

                markdownLines.push(markdownAnswer);
                markdownLines.push(separator);
            }
        }

        messages.forEach(parseMessage);

        const copyContent = markdownLines.join('\n');
        navigator.clipboard.writeText(copyContent);

        alert('Chat history copied to clipboard as Markdown');
    }

    main();
})()