import { copyable, h } from "./dom.js";
import { diagram } from "./mermaid.js";
import { taskStyle } from "./taskcolor.js";
import { todoLink } from "./todolink.js";
const choiceMarker = /^(\([ *]\)|\[[ xX]\])\s+(\S.*?)\s*$/;
const detailsOpen = /^\s*<details>\s*(?:<summary>(.*?)<\/summary>)?\s*$/i;
const summaryLine = /^\s*<summary>(.*?)<\/summary>\s*$/i;
const detailsClose = /^\s*<\/details>\s*$/i;
const fence = /^\s*(```|~~~)\s*(\S*)/;
const heading = /^(#{1,6})\s+(.*)$/;
const bullet = /^(\s*)[-*+]\s+(.*)$/;
const ordered = /^(\s*)(\d+)[.)]\s+(.*)$/;
const quote = /^\s*>\s?(.*)$/;
const rule = /^\s*([-*_])(\s*\1){2,}\s*$/;
const imageOnly = /^\s*!\[[^\]]*\]\((<[^>]*>|[^)]*)\)\s*$/;
const tableSep = /^\s*\|?\s*:?-+:?\s*(\|\s*:?-+:?\s*)*\|?\s*$/;
export function markdown(src, className = "md", opts = {}) {
    return h("div", { class: className }, ...blocks(src.replace(/\r\n?/g, "\n").split("\n"), opts));
}
export function inlineMarkdown(src, opts = {}) {
    return h("span", { class: "md-inline" }, ...inline(src, opts));
}
function blocks(lines, opts) {
    const out = [];
    let i = 0;
    while (i < lines.length) {
        const line = lines[i];
        if (line.trim() === "") {
            i++;
            continue;
        }
        const f = fence.exec(line);
        if (f) {
            const marker = f[1];
            const body = [];
            i++;
            while (i < lines.length && !lines[i].trimStart().startsWith(marker)) {
                body.push(lines[i]);
                i++;
            }
            i++;
            const lang = f[2].toLowerCase();
            if (lang === "mermaid") {
                out.push(diagram(body.join("\n")));
                continue;
            }
            if (lang === "diff" || lang === "patch") {
                out.push(copyable(h("pre", { class: "md-code diff" }, h("code", {}, ...body.map(diffLine)))));
                continue;
            }
            out.push(copyable(h("pre", { class: "md-code" }, h("code", {}, body.join("\n")))));
            continue;
        }
        if (detailsClose.test(line)) {
            i++;
            continue;
        }
        const d = detailsOpen.exec(line);
        if (d) {
            let title = d[1];
            i++;
            if (title === undefined && i < lines.length && summaryLine.test(lines[i])) {
                title = summaryLine.exec(lines[i])[1];
                i++;
            }
            const body = [];
            let depth = 1;
            while (i < lines.length) {
                const l = lines[i];
                i++;
                if (detailsOpen.test(l)) {
                    depth++;
                }
                else if (detailsClose.test(l) && --depth === 0) {
                    break;
                }
                body.push(l);
            }
            out.push(h("details", { class: "md-details" }, h("summary", {}, ...inline(title?.trim() || "Details", opts)), h("div", { class: "md-details-body" }, ...blocks(body, opts))));
            continue;
        }
        const hd = heading.exec(line);
        if (hd) {
            const level = Math.min(hd[1].length + 2, 6);
            out.push(h(`h${level}`, {}, ...inline(hd[2], opts)));
            i++;
            continue;
        }
        if (rule.test(line)) {
            out.push(h("hr"));
            i++;
            continue;
        }
        if (quote.test(line)) {
            const body = [];
            while (i < lines.length && quote.test(lines[i])) {
                body.push(quote.exec(lines[i])[1]);
                i++;
            }
            out.push(h("blockquote", {}, ...blocks(body, { taskId: opts.taskId })));
            continue;
        }
        if (bullet.test(line) || ordered.test(line)) {
            const [list, next] = parseList(lines, i, opts);
            out.push(list);
            i = next;
            continue;
        }
        if (line.includes("|") && i + 1 < lines.length && tableSep.test(lines[i + 1])) {
            const rows = [cells(line)];
            i += 2;
            while (i < lines.length && lines[i].includes("|") && lines[i].trim() !== "") {
                rows.push(cells(lines[i]));
                i++;
            }
            out.push(table(rows, opts));
            continue;
        }
        const para = [];
        while (i < lines.length && lines[i].trim() !== "" && !startsBlock(lines, i)) {
            para.push(lines[i].trim());
            i++;
        }
        out.push(h("p", {}, ...joinLines(para, opts)));
    }
    return out;
}
function diffLine(l) {
    const cls = l.startsWith("@@") ? "hunk" : l.startsWith("+++") || l.startsWith("---") ? "meta" : l.startsWith("+") ? "add" : l.startsWith("-") ? "del" : "ctx";
    return h("span", { class: `line ${cls}` }, l + "\n");
}
function startsBlock(lines, i) {
    const line = lines[i];
    return (fence.test(line) ||
        detailsOpen.test(line) ||
        detailsClose.test(line) ||
        heading.test(line) ||
        rule.test(line) ||
        quote.test(line) ||
        bullet.test(line) ||
        ordered.test(line) ||
        (line.includes("|") && i + 1 < lines.length && tableSep.test(lines[i + 1])));
}
function joinLines(lines, opts) {
    const out = [];
    lines.forEach((l, n) => {
        if (n > 0) {
            out.push(h("br"));
        }
        out.push(...inline(l, opts));
    });
    return out;
}
function indentOf(line) {
    return line.length - line.trimStart().length;
}
function parseList(lines, start, opts) {
    const first = lines[start];
    const isOrdered = !bullet.test(first);
    const base = indentOf(first);
    const list = isOrdered ? h("ol") : h("ul");
    if (isOrdered) {
        const n = Number(ordered.exec(first)[2]);
        if (n !== 1) {
            list.start = n;
        }
    }
    let i = start;
    let imageChoices = !isOrdered && !!opts.choice;
    while (i < lines.length) {
        const line = lines[i];
        const m = isOrdered ? ordered.exec(line) : bullet.exec(line);
        if (!m || indentOf(line) !== base) {
            break;
        }
        const text = isOrdered ? m[3] : m[2];
        const body = [text];
        i++;
        while (i < lines.length) {
            const next = lines[i];
            if (next.trim() === "") {
                const after = lines[i + 1];
                if (after !== undefined && indentOf(after) > base && after.trim() !== "") {
                    body.push("");
                    i++;
                    continue;
                }
                break;
            }
            if (indentOf(next) <= base && (bullet.test(next) || ordered.test(next) || startsBlock(lines, i))) {
                break;
            }
            body.push(indentOf(next) > base ? next.slice(Math.min(indentOf(next), base + 2)) : next.trim());
            i++;
        }
        const detail = body.slice(1).filter((l) => l.trim() !== "");
        imageChoices &&= choiceMarker.test(text) && detail.length === 1 && imageOnly.test(detail[0]);
        list.append(item(body, isOrdered ? { taskId: opts.taskId } : opts));
        while (i < lines.length && lines[i].trim() === "" && lines[i + 1] !== undefined && indentOf(lines[i + 1]) === base && (isOrdered ? ordered : bullet).test(lines[i + 1])) {
            i++;
        }
    }
    if (imageChoices) {
        list.className = "choice-grid";
    }
    return [list, i];
}
function item(body, opts) {
    const li = h("li");
    const m = opts.choice && choiceMarker.exec(body[0]);
    const picker = m ? opts.choice(m[2]) : null;
    const detail = h("div", { class: "choice-detail" });
    if (picker) {
        li.className = "choice";
        li.append(picker);
        if (body.slice(1).some((l) => l.trim() !== "")) {
            picker.append(detail);
        }
    }
    const target = picker ? detail : li;
    const first = picker ? [] : [body[0]];
    const rest = body.slice(1);
    if (rest.every((_, n) => !startsBlock(body, n + 1)) && !rest.includes("")) {
        target.append(...joinLines([...first, ...rest].map((l) => l.trim()), opts));
        return li;
    }
    const head = first;
    let k = 1;
    while (k < body.length && body[k] !== "" && !startsBlock(body, k)) {
        head.push(body[k].trim());
        k++;
    }
    target.append(...joinLines(head, opts), ...blocks(body.slice(k), opts));
    return li;
}
function cells(line) {
    let s = line.trim();
    if (s.startsWith("|")) {
        s = s.slice(1);
    }
    if (s.endsWith("|")) {
        s = s.slice(0, -1);
    }
    return s.split("|").map((c) => c.trim());
}
function table(rows, opts) {
    const [head, ...body] = rows;
    return h("div", { class: "md-table" }, h("table", {}, h("thead", {}, h("tr", {}, ...head.map((c) => h("th", {}, ...inline(c, opts))))), h("tbody", {}, ...body.map((r) => h("tr", {}, ...r.map((c) => h("td", {}, ...inline(c, opts))))))));
}
const inlineToken = /`([^`]+)`|\*\*(.+?)\*\*|__(.+?)__|\*([^*\s][^*]*?)\*|(?<![\w])_([^_\s][^_]*?)_(?![\w])|!\[([^\]]*)\]\((?:<([^>]+)>|([^)]+))\)|\[([^\]]+)\]\(([^)\s]+)\)|(https?:\/\/[^\s<>()]+[^\s<>().,;:!?'"])/;
function inline(src, opts) {
    const out = [];
    let rest = src;
    while (rest.length > 0) {
        const m = inlineToken.exec(rest);
        if (!m) {
            out.push(document.createTextNode(rest));
            break;
        }
        if (m.index > 0) {
            out.push(document.createTextNode(rest.slice(0, m.index)));
        }
        const [whole, code, strong1, strong2, em1, em2, imgAlt, imgAngled, imgSrc, linkText, linkHref, bare] = m;
        if (code !== undefined) {
            out.push(h("code", {}, code));
        }
        else if (strong1 !== undefined || strong2 !== undefined) {
            out.push(h("strong", {}, ...inline(strong1 ?? strong2, opts)));
        }
        else if (em1 !== undefined || em2 !== undefined) {
            out.push(h("em", {}, ...inline(em1 ?? em2, opts)));
        }
        else if (imgAlt !== undefined) {
            out.push(image((imgAngled ?? imgSrc).trim(), imgAlt, opts.taskId));
        }
        else if (linkText !== undefined) {
            out.push(link(linkHref, inline(linkText, opts)));
        }
        else if (bare !== undefined) {
            out.push(link(bare, [document.createTextNode(bare)]));
        }
        rest = rest.slice(m.index + whole.length);
    }
    return out;
}
function link(href, children) {
    if (/^https?:\/\//i.test(href)) {
        return h("a", { href, target: "_blank", rel: "noopener noreferrer" }, ...children);
    }
    const task = /^#\/task\/(\w+)(\/\w+)?$/.exec(href);
    if (task) {
        return h("a", { href, class: "task-link", style: taskStyle(task[1]) }, ...children);
    }
    const todo = /^#\/todo\/(\w+)\/(.+)$/.exec(href);
    if (todo) {
        try {
            return todoLink(todo[1], decodeURIComponent(todo[2]), children);
        }
        catch {
            return h("span", {}, ...children);
        }
    }
    if (href.startsWith("#/")) {
        return h("a", { href }, ...children);
    }
    return h("span", {}, ...children);
}
function worktreeImageURL(path, taskId) {
    if (/^data:image\/(png|jpeg|gif|webp);/i.test(path)) {
        return path;
    }
    let file = path;
    if (/^file:\/\//i.test(file)) {
        file = decodeURI(file.slice("file://".length));
    }
    else if (/^[a-z][a-z0-9+.-]*:/i.test(file)) {
        return null;
    }
    if (!taskId) {
        return null;
    }
    return `/api/tasks/${encodeURIComponent(taskId)}/image?path=${encodeURIComponent(file)}`;
}
export function image(src, alt, taskId) {
    const url = worktreeImageURL(src, taskId);
    if (!url) {
        return link(src, [document.createTextNode(alt || src)]);
    }
    const img = h("img", { src: url, alt, loading: "lazy" });
    const el = h("a", { class: "md-img", href: url, target: "_blank", rel: "noopener" }, img);
    img.onerror = () => el.replaceWith(h("span", { class: "md-img-missing" }, `image not available: ${src}`));
    return el;
}
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