(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
      (global.Layer = factory());
}(this, (function () {
  'use strict';

  const PREFIX = 'layer-';
  
  // Theme & Styles
  const css = `
    .${PREFIX}overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.4);
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 1000;
      opacity: 0;
      transition: opacity 0.3s;
    }
    .${PREFIX}overlay.show {
      opacity: 1;
    }
    .${PREFIX}popup {
      background: #fff;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      width: 32em;
      max-width: 90%;
      padding: 1.5em;
      display: flex;
      flex-direction: column;
      align-items: center;
      transform: scale(0.9);
      transition: transform 0.3s;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }
    .${PREFIX}overlay.show .${PREFIX}popup {
      transform: scale(1);
    }
    .${PREFIX}title {
      font-size: 1.8em;
      font-weight: 600;
      color: #333;
      margin: 0 0 0.5em;
      text-align: center;
    }
    .${PREFIX}content {
      font-size: 1.125em;
      color: #545454;
      margin-bottom: 1.5em;
      text-align: center;
      line-height: 1.5;
    }
    .${PREFIX}actions {
      display: flex;
      justify-content: center;
      gap: 1em;
      width: 100%;
    }
    .${PREFIX}button {
      border: none;
      border-radius: 4px;
      padding: 0.6em 1.2em;
      font-size: 1em;
      cursor: pointer;
      transition: background-color 0.2s, box-shadow 0.2s;
      color: #fff;
    }
    .${PREFIX}confirm {
      background-color: #3085d6;
    }
    .${PREFIX}confirm:hover {
      background-color: #2b77c0;
    }
    .${PREFIX}cancel {
      background-color: #aaa;
    }
    .${PREFIX}cancel:hover {
      background-color: #999;
    }
    .${PREFIX}icon {
      width: 5em;
      height: 5em;
      border: 0.25em solid transparent;
      border-radius: 50%;
      margin: 1.5em auto 1.2em;
      box-sizing: content-box;
      position: relative;
    }
    
    /* Success Icon */
    .${PREFIX}icon.success {
      border-color: #a5dc86;
      color: #a5dc86;
    }
    .${PREFIX}icon.success::before, .${PREFIX}icon.success::after {
      content: '';
      position: absolute;
      background: #fff;
      border-radius: 50%;
    }
    .${PREFIX}success-line-tip {
      width: 1.5em;
      height: 0.3em;
      background-color: #a5dc86;
      display: block;
      position: absolute;
      top: 2.85em;
      left: 0.85em;
      transform: rotate(45deg);
      border-radius: 0.15em;
    }
    .${PREFIX}success-line-long {
      width: 2.9em;
      height: 0.3em;
      background-color: #a5dc86;
      display: block;
      position: absolute;
      top: 2.4em;
      right: 0.5em;
      transform: rotate(-45deg);
      border-radius: 0.15em;
    }

    /* Error Icon */
    .${PREFIX}icon.error {
      border-color: #f27474;
      color: #f27474;
    }
    .${PREFIX}error-x-mark {
      position: relative;
      display: block;
    }
    .${PREFIX}error-line {
      position: absolute;
      height: 0.3em;
      width: 3em;
      background-color: #f27474;
      display: block;
      top: 2.3em;
      left: 1em;
      border-radius: 0.15em;
    }
    .${PREFIX}error-line.left {
      transform: rotate(45deg);
    }
    .${PREFIX}error-line.right {
      transform: rotate(-45deg);
    }
    
    /* Warning Icon */
    .${PREFIX}icon.warning {
      border-color: #facea8;
      color: #f8bb86;
    }
    .${PREFIX}warning-body {
      position: absolute;
      width: 0.3em;
      height: 2.9em;
      background-color: #f8bb86;
      left: 50%;
      top: 0.6em;
      margin-left: -0.15em;
      border-radius: 0.15em;
    }
    .${PREFIX}warning-dot {
      position: absolute;
      width: 0.3em;
      height: 0.3em;
      background-color: #f8bb86;
      left: 50%;
      bottom: 0.6em;
      margin-left: -0.15em;
      border-radius: 50%;
    }
  `;

  // Inject Styles
  const injectStyles = () => {
    if (document.getElementById(`${PREFIX}styles`)) return;
    const styleSheet = document.createElement('style');
    styleSheet.id = `${PREFIX}styles`;
    styleSheet.textContent = css;
    document.head.appendChild(styleSheet);
  };

  class Layer {
    constructor() {
      injectStyles();
      this.params = {};
      this.dom = {};
      this.promise = null;
      this.resolve = null;
      this.reject = null;
    }

    // Static entry point
    static fire(options) {
      const instance = new Layer();
      return instance._fire(options);
    }

    _fire(options = {}) {
      if (typeof options === 'string') {
        options = { title: options };
        if (arguments[1]) options.text = arguments[1];
        if (arguments[2]) options.icon = arguments[2];
      }

      this.params = {
        title: '',
        text: '',
        icon: null,
        confirmButtonText: 'OK',
        cancelButtonText: 'Cancel',
        showCancelButton: false,
        confirmButtonColor: '#3085d6',
        cancelButtonColor: '#aaa',
        closeOnClickOutside: true,
        ...options
      };

      this.promise = new Promise((resolve, reject) => {
        this.resolve = resolve;
        this.reject = reject;
      });

      this._render();
      return this.promise;
    }

    _render() {
      // Remove existing if any
      const existing = document.querySelector(`.${PREFIX}overlay`);
      if (existing) existing.remove();

      // Create Overlay
      this.dom.overlay = document.createElement('div');
      this.dom.overlay.className = `${PREFIX}overlay`;

      // Create Popup
      this.dom.popup = document.createElement('div');
      this.dom.popup.className = `${PREFIX}popup`;
      this.dom.overlay.appendChild(this.dom.popup);

      // Icon
      if (this.params.icon) {
        this.dom.icon = this._createIcon(this.params.icon);
        this.dom.popup.appendChild(this.dom.icon);
      }

      // Title
      if (this.params.title) {
        this.dom.title = document.createElement('h2');
        this.dom.title.className = `${PREFIX}title`;
        this.dom.title.textContent = this.params.title;
        this.dom.popup.appendChild(this.dom.title);
      }

      // Text
      if (this.params.text) {
        this.dom.content = document.createElement('div');
        this.dom.content.className = `${PREFIX}content`;
        this.dom.content.textContent = this.params.text;
        this.dom.popup.appendChild(this.dom.content);
      }

      // Actions
      this.dom.actions = document.createElement('div');
      this.dom.actions.className = `${PREFIX}actions`;
      
      // Cancel Button
      if (this.params.showCancelButton) {
        this.dom.cancelBtn = document.createElement('button');
        this.dom.cancelBtn.className = `${PREFIX}button ${PREFIX}cancel`;
        this.dom.cancelBtn.textContent = this.params.cancelButtonText;
        this.dom.cancelBtn.style.backgroundColor = this.params.cancelButtonColor;
        this.dom.cancelBtn.onclick = () => this._close(false);
        this.dom.actions.appendChild(this.dom.cancelBtn);
      }

      // Confirm Button
      this.dom.confirmBtn = document.createElement('button');
      this.dom.confirmBtn.className = `${PREFIX}button ${PREFIX}confirm`;
      this.dom.confirmBtn.textContent = this.params.confirmButtonText;
      this.dom.confirmBtn.style.backgroundColor = this.params.confirmButtonColor;
      this.dom.confirmBtn.onclick = () => this._close(true);
      this.dom.actions.appendChild(this.dom.confirmBtn);

      this.dom.popup.appendChild(this.dom.actions);

      // Event Listeners
      if (this.params.closeOnClickOutside) {
        this.dom.overlay.addEventListener('click', (e) => {
          if (e.target === this.dom.overlay) {
            this._close(null); // Dismiss
          }
        });
      }

      document.body.appendChild(this.dom.overlay);

      // Animation
      requestAnimationFrame(() => {
        this.dom.overlay.classList.add('show');
      });
    }

    _createIcon(type) {
      const icon = document.createElement('div');
      icon.className = `${PREFIX}icon ${type}`;
      
      if (type === 'success') {
        const tip = document.createElement('div');
        tip.className = `${PREFIX}success-line-tip`;
        const long = document.createElement('div');
        long.className = `${PREFIX}success-line-long`;
        icon.appendChild(tip);
        icon.appendChild(long);
      } else if (type === 'error') {
        const xMark = document.createElement('span');
        xMark.className = `${PREFIX}error-x-mark`;
        const left = document.createElement('span');
        left.className = `${PREFIX}error-line left`;
        const right = document.createElement('span');
        right.className = `${PREFIX}error-line right`;
        xMark.appendChild(left);
        xMark.appendChild(right);
        icon.appendChild(xMark);
      } else if (type === 'warning') {
        const body = document.createElement('div');
        body.className = `${PREFIX}warning-body`;
        const dot = document.createElement('div');
        dot.className = `${PREFIX}warning-dot`;
        icon.appendChild(body);
        icon.appendChild(dot);
      }
      
      return icon;
    }

    _close(isConfirmed) {
      this.dom.overlay.classList.remove('show');
      setTimeout(() => {
        if (this.dom.overlay && this.dom.overlay.parentNode) {
          this.dom.overlay.parentNode.removeChild(this.dom.overlay);
        }
      }, 300);

      if (isConfirmed === true) {
        this.resolve({ isConfirmed: true, isDenied: false, isDismissed: false });
      } else if (isConfirmed === false) {
        this.resolve({ isConfirmed: false, isDenied: false, isDismissed: true, dismiss: 'cancel' });
      } else {
        this.resolve({ isConfirmed: false, isDenied: false, isDismissed: true, dismiss: 'backdrop' });
      }
    }
  }

  return Layer;

})));