/*
 * mdtable.js - OSS tool for HTML5 Tables
 * This Class creates a HTML Tag (md-table) which lets you define a Markdown Table INSIDE
 * of your exsisting HTML, you do NOT need any external libraries as this is a vanilla javascript class.
 * Example HTML at EOF!
 *
 * written by rattatwinko@26/02/26 (license: MIT)
 */
class MdTable extends HTMLElement {
  constructor() {
    super();
    const shadow = this.attachShadow({ mode: "open" });
    const style = document.createElement("style");
    style.textContent = MdTable.styles;

    this._wrapper = document.createElement("div");
    shadow.append(style, this._wrapper);
  }

  static get observedAttributes() {
    return ["caption"];
  }

  connectedCallback() {
    this._render();
  }

  attributeChangedCallback() {
    this._render();
  }

  _render() {
    const raw = this.textContent.trim();
    if (!raw) return;
    const parsed = this._parseMarkdown(raw);
    if (!parsed) return;
    const { headers, rows, aligns } = parsed;
    const table = document.createElement("table");
    const captionText = this.getAttribute("caption");

    if (captionText) {
      const caption = document.createElement("caption");
      caption.textContent = captionText;
      table.appendChild(caption);
    }

    const thead = document.createElement("thead");
    const tbody = document.createElement("tbody");
    const trHead = document.createElement("tr");

    headers.forEach((text, i) => {
      const th = document.createElement("th");
      th.textContent = text;
      th.dataset.align = aligns[i];

      if (this.hasAttribute("sortable")) {
        th.classList.add("sortable");
        th.addEventListener("click", () => {
          this._sortTable(tbody, i);
        });
      }

      trHead.appendChild(th);
    });

    thead.appendChild(trHead);
    
    // create table elements based on how many rows there are
    rows.forEach(row => {
      const tr = document.createElement("tr");

      row.forEach((text, i) => {
        const td = document.createElement("td");
        td.textContent = text;
        td.dataset.align = aligns[i];
        tr.appendChild(td);
      });

      tbody.appendChild(tr);
    });

    table.append(thead, tbody);

    this._wrapper.replaceChildren(table);
  }
  
  // parse table
  _parseMarkdown(md) {
    const lines = md
      .split("\n")
      .map(l => l.trim())
      .filter(Boolean);

    if (lines.length < 2) return null;

    const headers = lines[0]
      .split("|")
      .map(c => c.trim())
      .filter(Boolean);

    const alignRow = lines[1]
      .split("|")
      .map(c => c.trim())
      .filter(Boolean);

    const aligns = alignRow.map(a => {
      if (a.startsWith(":") && a.endsWith(":")) return "center";
      if (a.endsWith(":")) return "right";
      if (a.startsWith(":")) return "left";
      return "left";
    });

    const rows = lines.slice(2).map(line =>
      line.split("|")
        .map(c => c.trim())
        .filter(Boolean)
    );

    return { headers, rows, aligns };
  }

  _sortTable(tbody, columnIndex) {
    const rows = Array.from(tbody.querySelectorAll("tr"));
    const isNumeric = rows.every(row =>
      !isNaN(parseFloat(row.children[columnIndex].textContent))
    );

    const asc = this._lastSortCol !== columnIndex || !this._lastAsc;
    this._lastSortCol = columnIndex;
    this._lastAsc = asc;

    rows.sort((a, b) => {
      let A = a.children[columnIndex].textContent;
      let B = b.children[columnIndex].textContent;

      if (isNumeric) {
        A = parseFloat(A);
        B = parseFloat(B);
      }

      return asc ? (A > B ? 1 : -1) : (A < B ? 1 : -1);
    });

    rows.forEach(r => tbody.appendChild(r));
  }

  static styles = `
    :host {
      display: block;
      font-family: sans-serif;
      --border-color: #ccc;
      --header-bg: #f5f5f5;
    }

    table {
      width: 100%;
      border-collapse: collapse;
    }

    caption {
      caption-side: top;
      padding: 6px 0;
      font-weight: bold;
      text-align: left;
    }

    th, td {
      border: 1px solid var(--border-color);
      padding: 6px 10px;
    }

    th {
      background: var(--header-bg);
      font-weight: 600;
    }

    th[data-align="right"],
    td[data-align="right"] {
      text-align: right;
    }

    th[data-align="center"],
    td[data-align="center"] {
      text-align: center;
    }

    th.sortable {
      cursor: pointer;
    }
  `;
}

// define <md-table></md-table>
customElements.define("md-table", MdTable);

/* Example HTML:
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>html5 mdtable</title>
    <script src="mdtable.js" defer></script>
  </head>
  <body>
    <md-table sortable caption="Users" variant="responsive">
    | Name | Age | Score |
    |:-----|----:|:----:|
    | Anna | 22  | 90 |
    | Max  | 30  | 85 |
    </md-table>
  </body>
</html>
*//*
License (MIT):

Copyright (c) 2026 rattatwinko
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/