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import { Component, OnInit } from '@angular/core'; | ||
import { AlertController, ViewController } from 'ionic-angular'; | ||
import { MeteorObservable } from 'meteor-rxjs'; | ||
import { _ } from 'meteor/underscore'; | ||
import { Observable, Subscription } from 'rxjs'; | ||
import { Chats, Users } from '../../../../imports/collections'; | ||
import { User } from '../../../../imports/models'; | ||
import template from './new-chat.html'; | ||
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@Component({ | ||
template | ||
}) | ||
export class NewChatComponent implements OnInit { | ||
senderId: string; | ||
users: Observable<User[]>; | ||
usersSubscription: Subscription; | ||
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constructor( | ||
private alertCtrl: AlertController, | ||
private viewCtrl: ViewController | ||
) { | ||
this.senderId = Meteor.userId(); | ||
} | ||
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ngOnInit() { | ||
this.loadUsers(); | ||
} | ||
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addChat(user): void { | ||
MeteorObservable.call('addChat', user._id).subscribe({ | ||
next: () => { | ||
this.viewCtrl.dismiss(); | ||
}, | ||
error: (e: Error) => { | ||
this.viewCtrl.dismiss().then(() => { | ||
this.handleError(e); | ||
}); | ||
} | ||
}); | ||
} | ||
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loadUsers(): void { | ||
this.users = this.findUsers(); | ||
} | ||
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findUsers(): Observable<User[]> { | ||
// Find all belonging chats | ||
return Chats.find({ | ||
memberIds: this.senderId | ||
}, { | ||
fields: { | ||
memberIds: 1 | ||
} | ||
}) | ||
// Invoke merge-map with an empty array in case no chat found | ||
.startWith([]) | ||
.mergeMap((chats) => { | ||
// Get all userIDs who we're chatting with | ||
const receiverIds = _.chain(chats) | ||
.pluck('memberIds') | ||
.flatten() | ||
.concat(this.senderId) | ||
.value(); | ||
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// Find all users which are not in belonging chats | ||
return Users.find({ | ||
_id: { $nin: receiverIds } | ||
}) | ||
// Invoke map with an empty array in case no user found | ||
.startWith([]); | ||
}); | ||
} | ||
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handleError(e: Error): void { | ||
console.error(e); | ||
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const alert = this.alertCtrl.create({ | ||
buttons: ['OK'], | ||
message: e.message, | ||
title: 'Oops!' | ||
}); | ||
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alert.present(); | ||
} | ||
} |