/**
 * Notification System
 * Accessible toast notifications
 */

(function () {
  "use strict";

  class NotificationManager {
    constructor() {
      this.container = null;
      this.notifications = new Map();
      this.init();
    }

    init() {
      if (document.readyState === "loading") {
        document.addEventListener("DOMContentLoaded", () =>
          this.createContainer()
        );
      } else {
        this.createContainer();
      }
    }

    createContainer() {
      if (!document.body || this.container) return;

      this.container = document.createElement("div");
      this.container.id = "notification-container";
      this.container.setAttribute("aria-live", "polite");
      this.container.setAttribute("aria-atomic", "true");
      this.container.className = "notification-container";

      const style = document.createElement("style");
      style.textContent = `
        .notification-container {
          position: fixed;
          top: 80px;
          right: 20px;
          z-index: 10000;
          display: flex;
          flex-direction: column;
          gap: 10px;
          max-width: 400px;
          pointer-events: none;
        }
        
        .notification {
          padding: 12px 20px;
          border-radius: 8px;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
          display: flex;
          align-items: center;
          gap: 12px;
          color: white;
          font-size: 14px;
          font-weight: 500;
          pointer-events: auto;
          animation: slideInRight 0.3s ease;
          min-width: 250px;
        }
        
        .notification.removing {
          animation: slideOutRight 0.3s ease;
        }
        
        .notification-success {
          background: #10b981;
        }
        
        .notification-error {
          background: #ef4444;
        }
        
        .notification-info {
          background: #3b82f6;
        }
        
        .notification-warning {
          background: #f59e0b;
        }
        
        .notification-icon {
          font-size: 18px;
          flex-shrink: 0;
        }
        
        .notification-message {
          flex: 1;
        }
        
        .notification-close {
          background: transparent;
          border: none;
          color: white;
          cursor: pointer;
          padding: 4px;
          opacity: 0.8;
          transition: opacity 0.2s;
        }
        
        .notification-close:hover {
          opacity: 1;
        }
        
        @keyframes slideInRight {
          from {
            transform: translateX(400px);
            opacity: 0;
          }
          to {
            transform: translateX(0);
            opacity: 1;
          }
        }
        
        @keyframes slideOutRight {
          from {
            transform: translateX(0);
            opacity: 1;
          }
          to {
            transform: translateX(400px);
            opacity: 0;
          }
        }
        
        @media (max-width: 640px) {
          .notification-container {
            right: 10px;
            left: 10px;
            max-width: none;
          }
          
          .notification {
            min-width: auto;
          }
        }
      `;

      document.head.appendChild(style);
      document.body.appendChild(this.container);
    }

    show(message, type = "info", duration = 3000) {
      if (!this.container) this.createContainer();
      if (!this.container) return;

      const id = Date.now() + Math.random();
      const notification = document.createElement("div");
      notification.className = `notification notification-${type}`;
      notification.setAttribute("role", "alert");

      const icons = {
        success: "✓",
        error: "✕",
        info: "ℹ",
        warning: "⚠",
      };

      notification.innerHTML = `
        <span class="notification-icon">${icons[type] || icons.info}</span>
        <span class="notification-message">${this.escapeHtml(message)}</span>
        <button class="notification-close" aria-label="Close notification">×</button>
      `;

      const closeBtn = notification.querySelector(".notification-close");
      closeBtn.addEventListener("click", () => this.remove(id));

      this.container.appendChild(notification);
      this.notifications.set(id, notification);

      if (duration > 0) {
        setTimeout(() => this.remove(id), duration);
      }

      return id;
    }

    remove(id) {
      const notification = this.notifications.get(id);
      if (!notification) return;

      notification.classList.add("removing");
      setTimeout(() => {
        if (notification.parentNode) {
          notification.parentNode.removeChild(notification);
        }
        this.notifications.delete(id);
      }, 300);
    }

    escapeHtml(text) {
      const div = document.createElement("div");
      div.textContent = text;
      return div.innerHTML;
    }

    success(message, duration) {
      return this.show(message, "success", duration);
    }

    error(message, duration) {
      return this.show(message, "error", duration);
    }

    info(message, duration) {
      return this.show(message, "info", duration);
    }

    warning(message, duration) {
      return this.show(message, "warning", duration);
    }
  }

  // Create global instance
  window.Notifications = window.Notifications || new NotificationManager();

  // Legacy compatibility
  window.showNotification = function (message, type = "info") {
    window.Notifications.show(message, type);
  };
})();