import { html, render, TemplateResult } from 'lit-html'

export interface KvMessageOptions {
  type?: 'success' | 'error' | 'loading'
  message: string
  duration?: number
  closable?: boolean
  position?: 'center' | 'right'
}

class KvMessage extends HTMLElement {
  private options: KvMessageOptions
  private timer: number | null = null

  constructor() {
    super()
    this.options = {
      type: 'success',
      message: '',
      duration: 2000,
      closable: true
    }
  }

  connectedCallback() {
    this.render()
  }

  setOptions(options: KvMessageOptions) {
    this.options = { ...this.options, ...options }
    this.render()
  }

  private render() {
    const { type, message, closable } = this.options

    const getTypeIcon = () => {
      switch (type) {
        case 'success':
          return '✓'
        case 'error':
          return '✕'
        case 'loading':
          return html`<div class="loading-spinner"></div>`
        default:
          return ''
      }
    }

    const template: TemplateResult = html`
      <style>
        :host {
          display: block;
          margin-bottom: 12px;
          animation: slideIn 0.3s ease-out;
        }

        .message-container {
          display: flex;
          align-items: center;
          gap: 8px;
          padding: 12px 16px;
          border-radius: 6px;
          box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
          background: white;
          position: relative;
          min-width: 300px;
          max-width: 500px;
          font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
          font-size: 14px;
          line-height: 1.4;
        }

        .message-container.success {
          border-left: 4px solid #52c41a;
        }

        .message-container.error {
          border-left: 4px solid #ff4d4f;
        }

        .message-container.loading {
          border-left: 4px solid #1890ff;
        }

        .message-icon {
          display: flex;
          align-items: center;
          justify-content: center;
          width: 16px;
          height: 16px;
          flex-shrink: 0;
        }

        .success .message-icon {
          color: #52c41a;
          font-weight: bold;
        }

        .error .message-icon {
          color: #ff4d4f;
          font-weight: bold;
        }

        .loading .message-icon {
          color: #1890ff;
        }

        .loading-spinner {
          width: 14px;
          height: 14px;
          border: 2px solid #f3f3f3;
          border-top: 2px solid #1890ff;
          border-radius: 50%;
          animation: spin 1s linear infinite;
        }

        .message-content {
          flex: 1;
          color: #333;
        }

        .message-close {
          display: flex;
          align-items: center;
          justify-content: center;
          width: 16px;
          height: 16px;
          cursor: pointer;
          color: #999;
          background: none;
          border: none;
          font-size: 12px;
          border-radius: 50%;
          transition: all 0.2s;
        }

        .message-close:hover {
          color: #666;
          background: #f0f0f0;
        }

        @keyframes slideIn {
          from {
            transform: translateX(100%);
            opacity: 0;
          }
          to {
            transform: translateX(0);
            opacity: 1;
          }
        }

        @keyframes slideOut {
          from {
            transform: translateX(0);
            opacity: 1;
          }
          to {
            transform: translateX(100%);
            opacity: 0;
          }
        }

        @keyframes spin {
          0% { transform: rotate(0deg); }
          100% { transform: rotate(360deg); }
        }

        .removing {
          animation: slideOut 0.3s ease-out forwards;
        }
      </style>

      <div class="message-container ${type}">
        <div class="message-icon">
          ${getTypeIcon()}
        </div>
        <div class="message-content">${message}</div>
        ${closable ? html`
          <button class="message-close" @click=${() => this.remove()}>&times;</button>
        ` : ''}
      </div>
    `

    render(template, this)

    if (type !== 'loading' && this.options.duration && this.options.duration > 0) {
      this.setTimer()
    }
  }

  private setTimer() {
    if (this.timer) {
      clearTimeout(this.timer)
    }

    this.timer = window.setTimeout(() => {
      this.remove()
    }, this.options.duration)
  }

  remove() {
    if (this.timer) {
      clearTimeout(this.timer)
      this.timer = null
    }

    this.classList.add('removing')

    setTimeout(() => {
      if (this.parentNode) {
        this.parentNode.removeChild(this)
      }
    }, 300)
  }

  disconnectedCallback() {
    if (this.timer) {
      clearTimeout(this.timer)
      this.timer = null
    }
  }
}

customElements.define('kv-message', KvMessage)

export class KvMessageManager {
  private static instance: KvMessageManager
  private container: HTMLElement | null = null
  private defaultPosition: 'center' | 'right' = 'center'

  static getInstance(): KvMessageManager {
    if (!KvMessageManager.instance) {
      KvMessageManager.instance = new KvMessageManager()
    }
    return KvMessageManager.instance
  }

  setDefaultPosition(position: 'center' | 'right') {
    this.defaultPosition = position
  }

  private getContainer(position?: 'center' | 'right'): HTMLElement {
    const finalPosition = position || this.defaultPosition

    if (!this.container) {
      this.container = document.getElementById('messages')
      if (!this.container) {
        this.container = document.createElement('div')
        this.container.id = 'messages'

        if (finalPosition === 'center') {
          this.container.style.cssText = `
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 9999;
            display: flex;
            gap: 8px;
            flex-direction: column;
            align-items: center;
            pointer-events: none;
          `
        } else {
          this.container.style.cssText = `
            position: fixed;
            top: 20px;
            right: 20px;
            z-index: 9999;
            display: flex;
            gap: 8px;
            flex-direction: column;
            align-items: flex-end;
            pointer-events: none;
          `
        }

        document.body.appendChild(this.container)
      }
    }
    return this.container
  }

  show(options: KvMessageOptions): KvMessage {
    const container = this.getContainer(options.position)

    const message = document.createElement('kv-message') as KvMessage
    message.setOptions(options)

    message.style.cssText = 'pointer-events: auto;'

    container.appendChild(message)

    return message
  }

  success(message: string, options?: { duration?: number; position?: 'center' | 'right'; closable?: boolean }): KvMessage {
    return this.show({
      type: 'success',
      message,
      duration: options?.duration || 2000,
      position: options?.position,
      closable: options?.closable
    })
  }

  error(message: string, options?: { duration?: number; position?: 'center' | 'right'; closable?: boolean }): KvMessage {
    return this.show({
      type: 'error',
      message,
      duration: options?.duration || 3000,
      position: options?.position,
      closable: options?.closable
    })
  }

  loading(message: string, options?: { position?: 'center' | 'right'; closable?: boolean }): KvMessage {
    return this.show({
      type: 'loading',
      message,
      duration: 0,
      position: options?.position,
      closable: options?.closable
    })
  }

  remove(message: KvMessage) {
    message.remove()
  }

  clear() {
    const container = this.getContainer()
    const messages = container.querySelectorAll('kv-message')
    messages.forEach(message => {
      (message as KvMessage).remove()
    })
  }
}

export const createMessage = () => KvMessageManager.getInstance()

// 将 createMessage 暴露到全局，以便 HTML 中的 JavaScript 可以使用
declare global {
  interface Window {
    createMessage: typeof createMessage
  }
}

window.createMessage = createMessage