import { Injectable } from '@angular/core';
import { DatePipe } from '@angular/common';
import { HermesSocketService } from './hermes-socket.service';
import EventService from './shared/services/EventService';

export interface Message {
	d: object,
	t: object,
	o: object
}

@Injectable({
	providedIn: 'root'
})
export class HermesClientService {
	pipe = new DatePipe('en-US')
    connected: boolean;
    logged_in: boolean;
    
	private subscriptions: { [key: number]: ((data: any) => void)[] }

	constructor(private socket: HermesSocketService, private events: EventService) {
		this.subscriptions = {};
        this.connected = false;
        this.logged_in = false;

        this.events.listen('tts_login', (payload) => {
            this.login(payload);
        });
	}

	public connect() {
        if (this.connected)
            return;

		this.socket.connect();
        this.connected = true;
		return this.listen();
	}

    public disconnect() {
        if (!this.connected)
            return;

        this.connected = false;
        this.logged_in = false;
        this.socket.close();
        this.events.emit('tts_logoff', null);
    }

	private send(op: number, data: any) {
		if (op != 0)
			console.log("TX:", data);

		this.socket.sendMessage({
			d: data,
			op
		});
	}

	public login(api_key: string) {
        if (!this.connected)
            this.connect();
        if (this.logged_in)
            return;
        
		this.send(1, {
			api_key,
			web_login: true,
			major_version: 0,
			minor_version: 1
		});
	}

    public createPolicy(groupId: string, path: string, usage: number, timespan: number) {
        if (!this.logged_in)
            return;
        
		this.send(3, {
            request_id: null,
			type: "create_policy",
            data: {
                groupId, path, count: usage, span: timespan
            },
		});
    }

    public deletePolicy(id: string) {
        if (!this.logged_in)
            return;

        this.send(3, {
            request_id: null,
			type: "delete_policy",
            data: {
                id
            },
		});
    }

    public fetchPolicies() {
        if (!this.logged_in)
            return;
        
		this.send(3, {
            request_id: null,
			type: "get_policies",
            data: null,
		});
    }

    public fetchPermissionsAndGroups() {
        if (!this.logged_in)
            return;
        
		this.send(3, {
            request_id: null,
			type: "get_permissions",
            data: null,
		});
    }

	public heartbeat() {
		const date = new Date()
		this.send(0, {
			date_time: this.pipe.transform(date.getTime() + date.getUTCDate(), "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSS'Z'")
		});
	}

	public subscribe(code: number, action: (data: any) => void) {
		if (!(code in this.subscriptions)) {
			this.subscriptions[code] = []
		}
		this.subscriptions[code].push(action);
	}

    public updatePolicy(id: string, groupId: string, path: string, usage: number, timespan: number) {
        if (!this.logged_in)
            return;
        
		this.send(3, {
            request_id: null,
			type: "update_policy",
            data: {
                id, groupId, path, count: usage, span: timespan
            },
		});
    }

	private listen() {
		return this.socket.subscribe({
			next: (message: any) => {
				console.log("RX:", message);
				switch (message.op) {
					case 0: // Heartbeat
						console.log("Heartbeat received. Potential connection problem?");
						break;
					case 2: // Login Ack
						console.log("Login successful.");
                        this.logged_in = true;
                        this.events.emit('tts_login_ack', null);
						break;
					case 4: // Request Ack
						console.log("Request received.");
						break;
				}
				if (message.op in this.subscriptions) {
					console.log('found #' + message.op + ' subscription for ' + message.op);
					for (let action of this.subscriptions[message.op])
						action(message.d);
				}
			},
			error: (err: any) => console.error('Websocket error', err),
			complete: () => console.log('Websocket disconnected.')
		});
	}
}