(function () {
  'use strict';

  interface UploadResponse {
    filename: string;
    mime: string;
    ref: string;
  }

  function initEditor(ta: HTMLTextAreaElement): void {
    async function upload(file: File): Promise<void> {
      const form = new FormData();
      form.append('file', file);
      const statusEl = ta.parentElement?.querySelector<HTMLElement>('.upload-status');
      if (statusEl) statusEl.textContent = '↑ ' + file.name + ' …';
      try {
        const res = await fetch('/media', { method: 'POST', body: form });
        if (!res.ok) {
          if (statusEl) statusEl.textContent = '✗ Fehler beim Hochladen';
          return;
        }
        const data: UploadResponse = await res.json();
        insertAtCursor('\n' + data.ref + '\n');
        if (statusEl) statusEl.textContent = '';
      } catch (_e) {
        if (statusEl) statusEl.textContent = '✗ Fehler beim Hochladen';
      }
    }

    function insertAtCursor(text: string): void {
      const start = ta.selectionStart;
      ta.value = ta.value.slice(0, start) + text + ta.value.slice(ta.selectionEnd);
      ta.selectionStart = ta.selectionEnd = start + text.length;
      ta.focus();
    }

    // Paste: catch file pastes
    ta.addEventListener('paste', function (e: ClipboardEvent) {
      const items = e.clipboardData?.items;
      if (!items) return;
      for (let i = 0; i < items.length; i++) {
        if (items[i].kind === 'file') {
          e.preventDefault();
          const file = items[i].getAsFile();
          if (file) void upload(file);
          return;
        }
      }
    });

    // Drag & Drop onto textarea
    ta.addEventListener('dragover', function (e: DragEvent) {
      e.preventDefault();
      ta.classList.add('drag-over');
    });
    ta.addEventListener('dragleave', function () {
      ta.classList.remove('drag-over');
    });
    ta.addEventListener('drop', function (e: DragEvent) {
      e.preventDefault();
      ta.classList.remove('drag-over');
      const files = e.dataTransfer?.files;
      if (!files) return;
      for (let i = 0; i < files.length; i++) void upload(files[i]);
    });

    // File picker button
    const picker = ta.parentElement?.querySelector<HTMLButtonElement>('.media-picker');
    const input  = ta.parentElement?.querySelector<HTMLInputElement>('.media-file-input');
    if (picker && input) {
      picker.addEventListener('click', function () { input.click(); });
      input.addEventListener('change', function () {
        if (!input.files) return;
        Array.from(input.files).forEach(f => void upload(f));
        input.value = '';
      });
    }
  }

  document.querySelectorAll<HTMLTextAreaElement>('textarea[name="description"]').forEach(initEditor);
})();