/**
 * UI Utilities
 * Reusable UI components and helpers
 */

import CONFIG from '../config.js';

/**
 * Modal Manager
 * Simplifies modal open/close operations
 */
export class ModalManager {
  /**
   * Show a modal
   * @param {string} modalId - ID of modal element
   * @param {Function} onOpen - Optional callback when modal opens
   */
  static show(modalId, onOpen = null) {
    const modal = document.getElementById(modalId);
    if (!modal) {
      console.error(`Modal #${modalId} not found`);
      return;
    }

    modal.classList.remove('hidden');

    if (onOpen) {
      onOpen(modal);
    }
  }

  /**
   * Hide a modal
   * @param {string} modalId - ID of modal element
   * @param {Function} onClose - Optional callback when modal closes
   */
  static hide(modalId, onClose = null) {
    const modal = document.getElementById(modalId);
    if (!modal) {
      console.error(`Modal #${modalId} not found`);
      return;
    }

    modal.classList.add('hidden');

    if (onClose) {
      onClose(modal);
    }
  }

  /**
   * Setup modal with close handlers
   * @param {string} modalId - ID of modal element
   * @param {string} closeButtonId - ID of close button
   * @param {Function} onClose - Optional cleanup callback
   * @returns {Function} Cleanup function
   */
  static setup(modalId, closeButtonId, onClose = null) {
    const modal = document.getElementById(modalId);
    const closeBtn = document.getElementById(closeButtonId);

    if (!modal || !closeBtn) {
      console.error(`Modal #${modalId} or close button #${closeButtonId} not found`);
      return () => {};
    }

    const handleClose = () => {
      this.hide(modalId, onClose);
    };

    // Close on button click
    closeBtn.addEventListener('click', handleClose);

    // Close on outside click
    modal.addEventListener('click', (e) => {
      if (e.target === modal) {
        handleClose();
      }
    });

    // Close on ESC key
    const handleEscape = (e) => {
      if (e.key === 'Escape') {
        handleClose();
      }
    };
    document.addEventListener('keydown', handleEscape);

    // Return cleanup function
    return () => {
      closeBtn.removeEventListener('click', handleClose);
      document.removeEventListener('keydown', handleEscape);
    };
  }
}

/**
 * Toast Notification System
 * Better than window.alert()
 */
export class Toast {
  static container = null;

  /**
   * Initialize toast container
   */
  static init() {
    if (this.container) return;

    this.container = document.createElement('div');
    this.container.id = 'toast-container';
    this.container.style.cssText = `
      position: fixed;
      top: ${CONFIG.UI.TOOLBAR_HEIGHT + 20}px;
      right: 20px;
      z-index: ${CONFIG.COLORS.PRIMARY};
      display: flex;
      flex-direction: column;
      gap: 10px;
      pointer-events: none;
    `;
    document.body.appendChild(this.container);
  }

  /**
   * Show a toast notification
   * @param {string} message - Message to display
   * @param {string} type - 'success', 'error', 'warning', 'info'
   * @param {number} duration - Display duration in ms (0 = persist)
   */
  static show(message, type = 'info', duration = 3000) {
    this.init();

    const toast = document.createElement('div');
    toast.className = `toast toast-${type}`;

    const colors = {
      success: CONFIG.COLORS.SUCCESS,
      error: CONFIG.COLORS.DANGER,
      warning: CONFIG.COLORS.WARNING,
      info: CONFIG.COLORS.PRIMARY
    };

    toast.style.cssText = `
      background-color: ${colors[type] || colors.info};
      color: white;
      padding: 12px 20px;
      border-radius: 6px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      max-width: 400px;
      word-wrap: break-word;
      pointer-events: auto;
      cursor: pointer;
      animation: slideIn 0.3s ease;
      font-size: 14px;
    `;

    toast.textContent = message;

    // Click to dismiss
    toast.addEventListener('click', () => {
      this.remove(toast);
    });

    this.container.appendChild(toast);

    // Auto-remove after duration
    if (duration > 0) {
      setTimeout(() => {
        this.remove(toast);
      }, duration);
    }

    return toast;
  }

  /**
   * Remove a toast
   */
  static remove(toast) {
    toast.style.animation = 'slideOut 0.3s ease';
    setTimeout(() => {
      if (toast.parentNode) {
        toast.parentNode.removeChild(toast);
      }
    }, 300);
  }

  // Convenience methods
  static success(message, duration) {
    return this.show(message, 'success', duration);
  }

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

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

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

/**
 * Loading Indicator
 */
export class LoadingIndicator {
  static overlay = null;

  static show(message = 'Loading...') {
    if (this.overlay) return;

    this.overlay = document.createElement('div');
    this.overlay.style.cssText = `
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: rgba(0, 0, 0, 0.5);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 9999;
    `;

    const spinner = document.createElement('div');
    spinner.style.cssText = `
      background-color: white;
      padding: 30px 40px;
      border-radius: 8px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
      text-align: center;
      font-size: 16px;
      color: #333;
    `;
    spinner.innerHTML = `
      <div style="margin-bottom: 15px;">
        <div class="spinner"></div>
      </div>
      ${message}
    `;

    this.overlay.appendChild(spinner);
    document.body.appendChild(this.overlay);
  }

  static hide() {
    if (this.overlay && this.overlay.parentNode) {
      this.overlay.parentNode.removeChild(this.overlay);
      this.overlay = null;
    }
  }
}

/**
 * Confirmation Dialog
 * Better than window.confirm()
 */
export class Confirm {
  /**
   * Show confirmation dialog
   * @param {string} message - Confirmation message
   * @param {Object} options - Options {title, confirmText, cancelText, onConfirm, onCancel}
   * @returns {Promise<boolean>} Resolves to true if confirmed
   */
  static async show(message, options = {}) {
    const {
      title = 'Confirm',
      confirmText = 'Confirm',
      cancelText = 'Cancel',
      danger = false
    } = options;

    return new Promise((resolve) => {
      // Create modal
      const modal = document.createElement('div');
      modal.className = 'modal';
      modal.innerHTML = `
        <div class="modal-content" style="max-width: 400px;">
          <div class="modal-header">
            <h3>${title}</h3>
          </div>
          <div class="modal-body">
            <p style="margin: 0; font-size: 14px; color: #666;">${message}</p>
          </div>
          <div class="modal-footer">
            <button class="btn btn-secondary cancel-btn">${cancelText}</button>
            <button class="btn ${danger ? 'btn-danger' : 'btn-primary'} confirm-btn">${confirmText}</button>
          </div>
        </div>
      `;

      document.body.appendChild(modal);

      const confirmBtn = modal.querySelector('.confirm-btn');
      const cancelBtn = modal.querySelector('.cancel-btn');

      const cleanup = () => {
        if (modal.parentNode) {
          modal.parentNode.removeChild(modal);
        }
      };

      confirmBtn.addEventListener('click', () => {
        cleanup();
        resolve(true);
      });

      cancelBtn.addEventListener('click', () => {
        cleanup();
        resolve(false);
      });

      modal.addEventListener('click', (e) => {
        if (e.target === modal) {
          cleanup();
          resolve(false);
        }
      });
    });
  }
}

/**
 * Prompt Dialog
 * Better than window.prompt()
 */
export class Prompt {
  /**
   * Show prompt dialog
   * @param {string} message - Prompt message
   * @param {Object} options - Options {title, defaultValue, placeholder, okText, cancelText}
   * @returns {Promise<string|null>} Resolves to input value or null if cancelled
   */
  static async show(message, options = {}) {
    const {
      title = 'Input Required',
      defaultValue = '',
      placeholder = '',
      okText = 'OK',
      cancelText = 'Cancel'
    } = options;

    return new Promise((resolve) => {
      const modal = document.createElement('div');
      modal.className = 'modal';
      modal.innerHTML = `
        <div class="modal-content" style="max-width: 400px;">
          <div class="modal-header">
            <h3>${title}</h3>
          </div>
          <div class="modal-body">
            <label style="display: block; margin-bottom: 8px; font-size: 14px; color: #666;">${message}</label>
            <input type="text" class="form-input prompt-input" value="${defaultValue}" placeholder="${placeholder}" />
          </div>
          <div class="modal-footer">
            <button class="btn btn-secondary cancel-btn">${cancelText}</button>
            <button class="btn btn-primary ok-btn">${okText}</button>
          </div>
        </div>
      `;

      document.body.appendChild(modal);

      const input = modal.querySelector('.prompt-input');
      const okBtn = modal.querySelector('.ok-btn');
      const cancelBtn = modal.querySelector('.cancel-btn');

      input.focus();
      input.select();

      const cleanup = () => {
        if (modal.parentNode) {
          modal.parentNode.removeChild(modal);
        }
      };

      const submit = () => {
        const value = input.value.trim();
        cleanup();
        resolve(value || null);
      };

      okBtn.addEventListener('click', submit);
      cancelBtn.addEventListener('click', () => {
        cleanup();
        resolve(null);
      });

      input.addEventListener('keydown', (e) => {
        if (e.key === 'Enter') {
          submit();
        } else if (e.key === 'Escape') {
          cleanup();
          resolve(null);
        }
      });
    });
  }
}

/**
 * Add CSS animations for toasts
 */
const style = document.createElement('style');
style.textContent = `
  @keyframes slideIn {
    from {
      transform: translateX(400px);
      opacity: 0;
    }
    to {
      transform: translateX(0);
      opacity: 1;
    }
  }

  @keyframes slideOut {
    from {
      transform: translateX(0);
      opacity: 1;
    }
    to {
      transform: translateX(400px);
      opacity: 0;
    }
  }

  .spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid ${CONFIG.COLORS.PRIMARY};
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
  }

  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
`;
document.head.appendChild(style);

// Initialize toast system
Toast.init();