/**
 * Common utilities for the SciPaperLoader application
 */

/**
 * Display a flash message to the user as an overlay
 * @param {string} message - The message to display
 * @param {string} type - The type of message (success, error, warning, info)
 * @param {number} duration - Duration in milliseconds (default: 5000)
 */
function showFlashMessage(message, type = "success", duration = 5000) {
  const flashMsg = document.createElement("div");
  const normalizedType = type === "error" ? "danger" : type;
  flashMsg.className = `flash-overlay flash-${normalizedType}`;
  
  // Get the appropriate icon based on type
  const getIcon = (messageType) => {
    switch (messageType) {
      case "success":
        return '<svg class="flash-icon" role="img" aria-label="Success:"><use xlink:href="#check-circle-fill"/></svg>';
      case "danger":
        return '<svg class="flash-icon" role="img" aria-label="Error:"><use xlink:href="#x-circle-fill"/></svg>';
      case "warning":
        return '<svg class="flash-icon" role="img" aria-label="Warning:"><use xlink:href="#exclamation-triangle-fill"/></svg>';
      case "info":
        return '<svg class="flash-icon" role="img" aria-label="Info:"><use xlink:href="#info-fill"/></svg>';
      default:
        return '<svg class="flash-icon" role="img" aria-label="Info:"><use xlink:href="#info-fill"/></svg>';
    }
  };

  flashMsg.innerHTML = `
    <div class="flash-content">
      ${getIcon(normalizedType)}
      <div class="flash-message">${message}</div>
      <button type="button" class="flash-close" onclick="this.parentElement.parentElement.remove()">×</button>
    </div>
  `;

  // Handle stacking of multiple messages
  const existingMessages = document.querySelectorAll('.flash-overlay');
  existingMessages.forEach((msg, index) => {
    msg.style.setProperty('--flash-index', index + 1);
  });

  // Add to page
  document.body.appendChild(flashMsg);

  // Auto dismiss
  setTimeout(() => {
    flashMsg.classList.add("fade-out");
    setTimeout(() => {
      if (flashMsg.parentNode) {
        flashMsg.remove();
        // Reposition remaining messages
        const remainingMessages = document.querySelectorAll('.flash-overlay');
        remainingMessages.forEach((msg, index) => {
          msg.style.setProperty('--flash-index', index);
        });
      }
    }, 300);
  }, duration);

  return flashMsg;
}

/**
 * Create a status badge HTML element
 * @param {string} status - The status to create a badge for
 * @returns {string} HTML string for the status badge
 */
function createStatusBadge(status) {
  switch (status) {
    case "New":
      return '<span class="badge bg-info">New</span>';
    case "Pending":
      return '<span class="badge bg-warning text-dark">Pending</span>';
    case "Done":
      return '<span class="badge bg-success">Done</span>';
    case "Failed":
      return '<span class="badge bg-danger">Failed</span>';
    case "success":
      return '<span class="badge bg-success">Success</span>';
    case "error":
      return '<span class="badge bg-danger">Error</span>';
    case "pending":
      return '<span class="badge bg-warning text-dark">Pending</span>';
    default:
      return `<span class="badge bg-secondary">${status}</span>`;
  }
}

/**
 * Format a timestamp to a readable time string
 * @param {string} timestamp - ISO timestamp string
 * @returns {string} Formatted time string
 */
function formatTimestamp(timestamp) {
  const date = new Date(timestamp);
  return date.toLocaleTimeString("de-DE", {
    year: "2-digit",
    month: "numeric",
    day: "numeric",
    hour: "2-digit",
    minute: "2-digit",
    second: "2-digit",
  });
}

/**
 * Truncate text to a specified length
 * @param {string} text - The text to truncate
 * @param {number} maxLength - Maximum length before truncation
 * @returns {string} Truncated text with ellipsis if needed
 */
function truncateText(text, maxLength) {
  return text.length > maxLength ? text.substring(0, maxLength) + "..." : text;
}

/**
 * Toggle button loading state
 * @param {HTMLElement} button - The button element
 * @param {boolean} loading - Whether to show loading state
 * @param {string} loadingText - Text to show when loading
 */
function toggleButtonLoading(button, loading, loadingText = "Loading...") {
  if (loading) {
    button.disabled = true;
    button.dataset.originalText = button.innerHTML;
    button.innerHTML = `<i class="fas fa-spinner fa-spin"></i> ${loadingText}`;
  } else {
    button.disabled = false;
    button.innerHTML = button.dataset.originalText || button.innerHTML;
  }
}

/**
 * Generic fetch wrapper with error handling
 * @param {string} url - The URL to fetch
 * @param {object} options - Fetch options
 * @returns {Promise} Fetch promise
 */
async function apiRequest(url, options = {}) {
  const defaultOptions = {
    headers: {
      "Content-Type": "application/json",
    },
  };

  const mergedOptions = { ...defaultOptions, ...options };

  try {
    const response = await fetch(url, mergedOptions);
    const data = await response.json();
    return data;
  } catch (error) {
    console.error(`API request failed for ${url}:`, error);
    throw error;
  }
}