// Shared alert/notification utility for consistent Tailwind styling and Font Awesome icons
// Provides: window.alerts.show(message, type?, options?) and compatibility shims

(function () {
  const TYPE_ALIASES = {
    error: 'danger',
    success: 'success',
    warning: 'warning',
    info: 'info',
    danger: 'danger'
  };

  const TYPE_CLASSES = {
    success: {
      container: 'border-success-200 dark:border-success-800',
      icon: 'fa-solid fa-circle-check text-success-600 dark:text-success-400'
    },
    danger: {
      container: 'border-danger-200 dark:border-danger-800',
      icon: 'fa-solid fa-triangle-exclamation text-danger-600 dark:text-danger-400'
    },
    warning: {
      container: 'border-warning-200 dark:border-warning-800',
      icon: 'fa-solid fa-triangle-exclamation text-warning-600 dark:text-warning-400'
    },
    info: {
      container: 'border-info-200 dark:border-info-800',
      icon: 'fa-solid fa-circle-info text-info-600 dark:text-info-400'
    }
  };

  function normalizeType(type) {
    const key = String(type || 'info').toLowerCase();
    return TYPE_ALIASES[key] || 'info';
  }

  function getOrCreateContainer(containerId = 'notification-container') {
    let container = document.getElementById(containerId);
    if (!container) {
      container = document.createElement('div');
      container.id = containerId;
      container.className = 'fixed top-4 right-4 z-50 flex flex-col gap-2 p-0';
      document.body.appendChild(container);
    }
    return container;
  }

  function show(message, type = 'info', options = {}) {
    const tone = normalizeType(type);
    const {
      duration = 5000,
      dismissible = true,
      containerId = 'notification-container',
      role = 'alert',
      ariaLive = 'polite',
      html = false,
      title = null,
      actions = [],
      onClose = null,
      id = null
    } = options;

    const container = getOrCreateContainer(containerId);

    const wrapper = document.createElement('div');
    wrapper.className = `alert-notification max-w-sm w-[22rem] bg-white dark:bg-neutral-800 border rounded-lg shadow-lg p-4 transition-all duration-300 translate-x-4 opacity-0 ${
      (TYPE_CLASSES[tone] || TYPE_CLASSES.info).container
    }`;
    wrapper.setAttribute('role', role);
    wrapper.setAttribute('aria-live', ariaLive);
    if (id) wrapper.id = id;

    const inner = document.createElement('div');
    inner.className = 'flex items-start';

    const iconWrap = document.createElement('div');
    iconWrap.className = 'flex-shrink-0';
    const icon = document.createElement('i');
    icon.className = (TYPE_CLASSES[tone] || TYPE_CLASSES.info).icon;
    iconWrap.appendChild(icon);

    const content = document.createElement('div');
    content.className = 'ml-3 flex-1';

    if (title) {
      const titleEl = document.createElement('p');
      titleEl.className = 'text-sm font-semibold text-neutral-900 dark:text-neutral-100';
      titleEl.textContent = String(title);
      content.appendChild(titleEl);
    }

    const text = document.createElement('div');
    text.className = 'text-xs mt-1 text-neutral-800 dark:text-neutral-200';
    if (message instanceof Node) {
      text.appendChild(message);
    } else if (html) {
      text.innerHTML = String(message || '');
    } else {
      text.textContent = String(message || '');
    }
    content.appendChild(text);

    inner.appendChild(iconWrap);
    inner.appendChild(content);

    if (dismissible) {
      const closeWrap = document.createElement('div');
      closeWrap.className = 'ml-4 flex-shrink-0';
      const closeBtn = document.createElement('button');
      closeBtn.setAttribute('aria-label', 'Close');
      closeBtn.className = 'text-neutral-400 hover:text-neutral-600 dark:text-neutral-500 dark:hover:text-neutral-300 transition-colors';
      closeBtn.addEventListener('click', () => {
        wrapper.remove();
        if (typeof onClose === 'function') onClose();
      });
      const x = document.createElement('i');
      x.className = 'fa-solid fa-xmark';
      closeBtn.appendChild(x);
      closeWrap.appendChild(closeBtn);
      inner.appendChild(closeWrap);
    }

    // Actions (buttons)
    if (Array.isArray(actions) && actions.length > 0) {
      const actionsWrap = document.createElement('div');
      actionsWrap.className = 'mt-2 flex gap-2 flex-wrap';

      actions.forEach((action) => {
        if (!action || !action.label) return;
        const btn = document.createElement('button');
        btn.type = 'button';
        btn.textContent = String(action.label);
        if (action.ariaLabel) btn.setAttribute('aria-label', action.ariaLabel);
        btn.className = action.classes || 'px-3 py-1 rounded text-xs transition-colors bg-neutral-200 hover:bg-neutral-300 text-neutral-800 dark:bg-neutral-700 dark:hover:bg-neutral-600 dark:text-neutral-200';
        btn.addEventListener('click', (ev) => {
          try {
            if (typeof action.onClick === 'function') {
              action.onClick({ event: ev, wrapper });
            }
          } finally {
            if (action.autoClose !== false) {
              wrapper.remove();
              if (typeof onClose === 'function') onClose();
            }
          }
        });
        actionsWrap.appendChild(btn);
      });

      content.appendChild(actionsWrap);
    }

    wrapper.appendChild(inner);
    container.appendChild(wrapper);

    // Animate in
    requestAnimationFrame(() => {
      wrapper.classList.remove('translate-x-4', 'opacity-0');
    });

    if (duration > 0) {
      setTimeout(() => {
        wrapper.classList.add('translate-x-4', 'opacity-0');
        setTimeout(() => {
          wrapper.remove();
          if (typeof onClose === 'function') onClose();
        }, 250);
      }, duration);
    }

    return wrapper;
  }

  const alerts = {
    show,
    success: (message, options = {}) => show(message, 'success', options),
    error: (message, options = {}) => show(message, 'danger', options),
    warning: (message, options = {}) => show(message, 'warning', options),
    info: (message, options = {}) => show(message, 'info', options),
    getOrCreateContainer
  };

  // Expose globally
  window.alerts = alerts;
  // Backward-compatible shims
  window.showAlert = (message, type = 'info', duration = 5000) => alerts.show(message, type, { duration });
  window.showNotification = (message, type = 'info', duration = 5000) => alerts.show(message, type, { duration });
  window.showToast = (message, type = 'info', duration = 3000) => alerts.show(message, type, { duration });
})();