import {
  DeesElement,
  property,
  html,
  customElement,
  type TemplateResult,
  cssManager,
  css,
  unsafeCSS,
  state,
} from '@design.estate/dees-element';

// Import design tokens
import { colors, bdTheme } from './00colors.js';
import { spacing, radius, shadows, transitions } from './00tokens.js';
import { fontFamilies, typography } from './00fonts.js';

// Types
export interface IMessage {
  id: string;
  text: string;
  sender: 'user' | 'support';
  time: string;
  status?: 'sending' | 'sent' | 'delivered' | 'read';
}

export interface IConversationData {
  id: string;
  title: string;
  messages: IMessage[];
}

declare global {
  interface HTMLElementTagNameMap {
    'sio-conversation-view': SioConversationView;
  }
}

@customElement('sio-conversation-view')
export class SioConversationView extends DeesElement {
  public static demo = () => html`
    <sio-conversation-view style="width: 600px; height: 600px;"></sio-conversation-view>
  `;

  @property({ type: Object })
  public conversation: IConversationData | null = null;

  @state()
  private messageText: string = '';

  @state()
  private isTyping: boolean = false;

  public static styles = [
    cssManager.defaultStyles,
    css`
      :host {
        display: flex;
        flex-direction: column;
        height: 100%;
        background: ${bdTheme('background')};
        font-family: ${unsafeCSS(fontFamilies.sans)};
      }

      .header {
        padding: ${unsafeCSS(spacing["4"])};
        border-bottom: 1px solid ${bdTheme('border')};
        background: ${bdTheme('background')};
        display: flex;
        align-items: center;
        gap: ${unsafeCSS(spacing["3"])};
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        position: sticky;
        top: 0;
        z-index: 10;
      }

      .back-button {
        display: none;
      }

      @media (max-width: 600px) {
        .back-button {
          display: block;
        }
      }

      .header-title {
        font-size: 1.125rem;
        line-height: 1.5;
        font-weight: 600;
        margin: 0;
        color: ${bdTheme('foreground')};
        flex: 1;
      }

      .header-actions {
        display: flex;
        gap: ${unsafeCSS(spacing["2"])};
      }

      .messages-container {
        flex: 1;
        overflow-y: auto;
        padding: ${unsafeCSS(spacing["4"])};
        display: flex;
        flex-direction: column;
        gap: ${unsafeCSS(spacing["3"])};
      }

      .message {
        display: flex;
        align-items: flex-start;
        gap: ${unsafeCSS(spacing["3"])};
        max-width: 70%;
      }

      .message.user {
        align-self: flex-end;
        flex-direction: row-reverse;
      }

      .message-bubble {
        padding: ${unsafeCSS(spacing["2.5"])} ${unsafeCSS(spacing["3.5"])};
        border-radius: ${unsafeCSS(radius["2xl"])};
        font-size: 0.9375rem;
        line-height: 1.6;
        position: relative;
        box-shadow: ${unsafeCSS(shadows.sm)};
        max-width: 100%;
        word-wrap: break-word;
      }

      .message.support .message-bubble {
        background: ${bdTheme('secondary')};
        color: ${bdTheme('secondaryForeground')};
        border-bottom-left-radius: ${unsafeCSS(spacing["1"])};
        border: 1px solid ${bdTheme('border')};
      }

      .message.user .message-bubble {
        background: ${bdTheme('primary')};
        color: ${bdTheme('primaryForeground')};
        border-bottom-right-radius: ${unsafeCSS(spacing["1"])};
      }

      .message-time {
        font-size: 0.75rem;
        line-height: 1.5;
        color: ${bdTheme('mutedForeground')};
        margin-top: ${unsafeCSS(spacing["1"])};
      }

      .message.user .message-time {
        text-align: right;
      }

      .typing-indicator {
        display: flex;
        align-items: center;
        gap: ${unsafeCSS(spacing["1"])};
        padding: ${unsafeCSS(spacing["2"])} ${unsafeCSS(spacing["3"])};
        background: ${bdTheme('muted')};
        border-radius: ${unsafeCSS(radius.lg)};
        width: fit-content;
      }

      .typing-dot {
        width: 8px;
        height: 8px;
        background: ${bdTheme('mutedForeground')};
        border-radius: 50%;
        animation: typing 1.4s infinite;
      }

      .typing-dot:nth-child(2) {
        animation-delay: 0.2s;
      }

      .typing-dot:nth-child(3) {
        animation-delay: 0.4s;
      }

      @keyframes typing {
        0%, 60%, 100% {
          opacity: 0.3;
          transform: scale(0.8);
        }
        30% {
          opacity: 1;
          transform: scale(1);
        }
      }

      .input-container {
        padding: ${unsafeCSS(spacing["4"])};
        border-top: 1px solid ${bdTheme('border')};
        background: ${bdTheme('background')};
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
      }

      .input-wrapper {
        display: flex;
        gap: ${unsafeCSS(spacing["2"])};
        align-items: flex-end;
      }

      .message-input {
        flex: 1;
        min-height: 42px;
        max-height: 120px;
        padding: ${unsafeCSS(spacing["2.5"])} ${unsafeCSS(spacing[3])};
        background: ${bdTheme('secondary')};
        border: 1px solid ${bdTheme('border')};
        border-radius: ${unsafeCSS(radius.xl)};
        font-size: 0.9375rem;
        color: ${bdTheme('foreground')};
        outline: none;
        resize: none;
        font-family: ${unsafeCSS(fontFamilies.sans)};
        line-height: 1.5;
        transition: ${unsafeCSS(transitions.all)};
      }

      .message-input::placeholder {
        color: ${bdTheme('mutedForeground')};
        font-size: 0.875rem;
      }

      .message-input:focus {
        border-color: ${bdTheme('ring')};
        background: ${bdTheme('background')};
        box-shadow: 0 0 0 3px ${bdTheme('ring')}15;
      }

      .input-actions {
        display: flex;
        gap: ${unsafeCSS(spacing["1"])};
      }

      .empty-state {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        gap: ${unsafeCSS(spacing["4"])};
        padding: ${unsafeCSS(spacing["8"])};
        text-align: center;
        color: ${bdTheme('mutedForeground')};
        animation: fadeIn 500ms ease-out;
      }
      
      @keyframes fadeIn {
        from {
          opacity: 0;
        }
        to {
          opacity: 1;
        }
      }

      .empty-icon {
        font-size: 64px;
        opacity: 0.5;
      }

      /* Scrollbar styling */
      .messages-container::-webkit-scrollbar {
        width: 6px;
      }

      .messages-container::-webkit-scrollbar-track {
        background: transparent;
      }

      .messages-container::-webkit-scrollbar-thumb {
        background: ${bdTheme('border')};
        border-radius: 3px;
      }

      .messages-container::-webkit-scrollbar-thumb:hover {
        background: ${bdTheme('mutedForeground')};
      }
    `,
  ];

  public render(): TemplateResult {
    if (!this.conversation) {
      return html`
        <div class="empty-state">
          <sio-icon class="empty-icon" icon="message-square"></sio-icon>
          <h3>Select a conversation</h3>
          <p>Choose a conversation from the sidebar to start messaging</p>
        </div>
      `;
    }

    return html`
      <div class="header">
        <sio-button
          class="back-button"
          type="ghost"
          size="sm"
          @click=${this.handleBack}
        >
          <sio-icon icon="arrow-left" size="16"></sio-icon>
        </sio-button>
        <h3 class="header-title">${this.conversation.title}</h3>
        <div class="header-actions">
          <sio-button type="ghost" size="sm">
            <sio-icon icon="phone" size="16"></sio-icon>
          </sio-button>
          <sio-button type="ghost" size="sm">
            <sio-icon icon="more-vertical" size="16"></sio-icon>
          </sio-button>
        </div>
      </div>

      <div class="messages-container" id="messages">
        ${this.conversation.messages.map(msg => html`
          <div class="message ${msg.sender}">
            <div class="message-content">
              <div class="message-bubble">
                ${msg.text}
              </div>
              <div class="message-time">${msg.time}</div>
            </div>
          </div>
        `)}
        
        ${this.isTyping ? html`
          <div class="message support">
            <div class="typing-indicator">
              <div class="typing-dot"></div>
              <div class="typing-dot"></div>
              <div class="typing-dot"></div>
            </div>
          </div>
        ` : ''}
      </div>

      <div class="input-container">
        <div class="input-wrapper">
          <textarea
            class="message-input"
            placeholder="Type a message..."
            .value=${this.messageText}
            @input=${this.handleInput}
            @keydown=${this.handleKeyDown}
            rows="1"
          ></textarea>
          <div class="input-actions">
            <sio-button type="ghost" size="sm">
              <sio-icon icon="paperclip" size="16"></sio-icon>
            </sio-button>
            <sio-button
              type="primary"
              size="sm"
              ?disabled=${!this.messageText.trim()}
              @click=${this.sendMessage}
            >
              <sio-icon icon="send" size="16"></sio-icon>
            </sio-button>
          </div>
        </div>
      </div>
    `;
  }

  private handleBack() {
    this.dispatchEvent(new CustomEvent('back', {
      bubbles: true,
      composed: true
    }));
  }

  private handleInput(e: Event) {
    const textarea = e.target as HTMLTextAreaElement;
    this.messageText = textarea.value;
    
    // Auto-resize textarea
    textarea.style.height = 'auto';
    textarea.style.height = Math.min(textarea.scrollHeight, 120) + 'px';
  }

  private handleKeyDown(e: KeyboardEvent) {
    if (e.key === 'Enter' && !e.shiftKey) {
      e.preventDefault();
      this.sendMessage();
    }
  }

  private sendMessage() {
    if (!this.messageText.trim()) return;

    const message: IMessage = {
      id: Date.now().toString(),
      text: this.messageText.trim(),
      sender: 'user',
      time: new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' }),
      status: 'sending'
    };

    // Dispatch event for parent to handle
    this.dispatchEvent(new CustomEvent('send-message', {
      detail: { message },
      bubbles: true,
      composed: true
    }));

    // Clear input
    this.messageText = '';
    const textarea = this.shadowRoot?.querySelector('.message-input') as HTMLTextAreaElement;
    if (textarea) {
      textarea.style.height = 'auto';
    }

    // Simulate typing indicator (remove in production)
    setTimeout(() => {
      this.isTyping = true;
      setTimeout(() => {
        this.isTyping = false;
      }, 2000);
    }, 1000);
  }

  public updated() {
    // Scroll to bottom when new messages arrive
    const container = this.shadowRoot?.querySelector('#messages');
    if (container) {
      container.scrollTop = container.scrollHeight;
    }
  }
}