import { HttpClient } from '@angular/common/http';
import { Component } from '@angular/core';
import { lastValueFrom } from 'rxjs';

import {
    DataPacket_Kind,
    DataPublishOptions,
    DataTopic,
    ParticipantService,
    RemoteParticipant,
    Room,
    RoomEvent,
    OpenViduComponentsModule,
} from 'openvidu-components-angular';

@Component({
    selector: 'app-root',
    template: `
        <!-- OpenVidu Video Conference Component -->
        <ov-videoconference
            [token]="token"
            [livekitUrl]="LIVEKIT_URL"
            [toolbarDisplayRoomName]="false"
            (onTokenRequested)="onTokenRequested($event)"
            (onRoomCreated)="onRoomCreated($event)"
        >
            <!-- Chat Panel -->
            <div *ovChatPanel id="my-panel">
                <h3>Chat</h3>
                <div>
                    <ul>
                        @for (msg of messages; track msg) {
                        <li>{{ msg }}</li>
                        }
                    </ul>
                </div>
                <input value="Hello" #input />
                <button (click)="send(input.value)">Send</button>
            </div>
        </ov-videoconference>
    `,
    styles: `
        #my-panel {
            background: #aafffc;
            height: 100%;
            overflow: hidden;
            text-align: center;
        }
    `,
    standalone: true,
    imports: [OpenViduComponentsModule],
})
export class AppComponent {
    // For local development, leave these variables empty
    // For production, configure them with correct URLs depending on your deployment
    APPLICATION_SERVER_URL = '';
    LIVEKIT_URL = '';

    // Define the name of the room and initialize the token variable
    roomName = 'chat-panel-directive-example';
    token!: string;
    messages: string[] = [];

    constructor(
        private httpClient: HttpClient,
        private participantService: ParticipantService
    ) {
        this.configureUrls();
    }

    private configureUrls() {
        // If APPLICATION_SERVER_URL is not configured, use default value from local development
        if (!this.APPLICATION_SERVER_URL) {
            if (window.location.hostname === 'localhost') {
                this.APPLICATION_SERVER_URL = 'http://localhost:6080/';
            } else {
                this.APPLICATION_SERVER_URL =
                    'https://' + window.location.hostname + ':6443/';
            }
        }

        // If LIVEKIT_URL is not configured, use default value from local development
        if (!this.LIVEKIT_URL) {
            if (window.location.hostname === 'localhost') {
                this.LIVEKIT_URL = 'ws://localhost:7880/';
            } else {
                this.LIVEKIT_URL = 'wss://' + window.location.hostname + ':7443/';
            }
        }
    }

    // Function to request a token when a participant joins the room
    async onTokenRequested(participantName: string) {
        const { token } = await this.getToken(this.roomName, participantName);
        this.token = token;
    }

    // Event handler for room creation
    onRoomCreated(room: Room) {
        room.on(
            RoomEvent.DataReceived,
            (
                payload: Uint8Array,
                participant?: RemoteParticipant,
                _?: DataPacket_Kind,
                topic?: string
            ) => {
                if (topic === DataTopic.CHAT) {
                    const { message } = JSON.parse(new TextDecoder().decode(payload));
                    const participantName = participant?.name || 'Unknown';
                    this.messages.push(message);
                    console.log(`Message received from ${participantName}:`, message);
                }
            }
        );
    }

    // Function to send a chat message
    async send(message: string): Promise<void> {
        const strData = JSON.stringify({ message });
        const data: Uint8Array = new TextEncoder().encode(strData);
        const options: DataPublishOptions = { topic: DataTopic.CHAT };
        await this.participantService.publishData(data, options);
        this.messages.push(message);
    }

    // Function to get a token from the server
    getToken(roomName: string, participantName: string): Promise<any> {
        try {
            // Send a POST request to the server to obtain a token
            return lastValueFrom(
                this.httpClient.post<any>(this.APPLICATION_SERVER_URL + 'token', {
                    roomName,
                    participantName,
                })
            );
        } catch (error: any) {
            // Handle errors, e.g., if the server is not reachable
            if (error.status === 404) {
                throw {
                    status: error.status,
                    message:
                        'Cannot connect with the backend. ' + error.url + ' not found',
                };
            }
            throw error;
        }
    }
}