From 1da9c1e81ac15e83a5a897c9b422413f9eb9f983 Mon Sep 17 00:00:00 2001
From: jgerstbe <jannikanni.jg@gmail.com>
Date: Sat, 31 Oct 2020 00:07:55 +0100
Subject: [PATCH] [A] channel.service functionality, create channel from
 sidebar

---
 src/app/api/supabase/channel.service.ts | 153 +++++++++++++++++++++++-
 src/app/api/supabase/channel.ts         |  13 ++
 src/app/api/supabase/standup.service.ts |   2 -
 src/app/sidebar/sidebar.component.html  |   9 +-
 src/app/sidebar/sidebar.component.ts    |  25 ++++
 5 files changed, 194 insertions(+), 8 deletions(-)
 create mode 100644 src/app/api/supabase/channel.ts

diff --git a/src/app/api/supabase/channel.service.ts b/src/app/api/supabase/channel.service.ts
index 0d73e6c..93ee5be 100644
--- a/src/app/api/supabase/channel.service.ts
+++ b/src/app/api/supabase/channel.service.ts
@@ -1,9 +1,160 @@
 import { Injectable } from '@angular/core';
+import { BehaviorSubject, Observable, of, Subject } from 'rxjs';
+import { Channel } from './channel';
+import { SupaService } from './supa.service';
 
 @Injectable({
   providedIn: 'root'
 })
 export class ChannelService {
+  channelMap = {};
+  channels: BehaviorSubject<any> = new BehaviorSubject([]);
+  isListening: boolean = false;
 
-  constructor() { }
+  constructor(
+    private supa: SupaService,
+  ) { }
+
+  /**
+   * Get Channels from local store.
+   * Requests data if store is emtpy.
+   * @returns Observable<Channel[]>
+   */
+  getChannels(): Observable<Channel[]> {
+    if (Object.values(this.channelMap).length === 0) {
+      console.log('getChannels - REFRESH')
+      return this.refreshChannels();
+    } else {
+      console.log('getChannels - LOCAL')
+      return this.channels.asObservable();
+    }
+  }
+
+  /**
+   * Listen to realtime events from channel db.
+   */
+  subscribeToChannels() {
+    if (!this.isListening) {
+      this.isListening = true;
+      this.supa.client.from<Channel>('channel').on('*', payload => {
+        console.log('subscribeToChannels - REALTIME EVENT', payload);
+        if ((payload.eventType === 'INSERT') || (payload.eventType === 'UPDATE')) {
+          this.channelMap[payload.new.id] = payload.new;
+        } else {
+          delete this.channelMap[payload.old.id];
+        }
+        this.next();
+      }).subscribe();
+    }
+  }
+
+  /** 
+   * Requests up to date data from API.
+   * Returns the local copy.
+   * @returns Observable<Channel>
+   */
+  refreshChannels(): Observable<Channel[]> {
+    this.subscribeToChannels();
+    this.supa.client.from<Channel>('channel').select()
+      .then(channels => this.updateStore(channels.body))
+      .catch(error => console.log('Error: ', error));
+    return this.channels.asObservable();
+  }
+
+  /**
+   * Update the local store with provided channels
+   * @param channels 
+   */
+  updateStore(channels: Channel[]) {
+    channels.forEach(e => {
+      this.channelMap[e.id] = e;
+    });
+    this.next();
+  }
+
+  /**
+   * Emits local store.
+   */
+  next = () => this.channels.next(Object.values(this.channelMap));
+
+  /**
+   * Retrieve channel from local store.
+   * @param id 
+   */
+  getOne(id: number) {
+    if (this.channelMap[id]) {
+      return of(this.channelMap[id]);
+    } else {
+      const subject: Subject<Channel> = new Subject();
+      this.supa.client.from<Channel>('channel').select('id, name, description')
+      .filter(<never>'id', 'eq', id)      
+      .then(data => {
+        this.updateStore([data.body[0]]);
+        subject.next(data.body[0]);
+        subject.complete();
+      })
+      .catch(error => {
+        subject.error(error);
+        subject.complete();
+      });
+      return subject.asObservable();
+    }
+  }
+
+  /**
+   * 
+   * @param channel 
+   */
+  updateOne(channel: Channel): Observable<Channel> {
+    const subject: Subject<Channel> = new Subject();
+    this.supa.client.from<Channel>('channel').update(channel)
+      .match({ id: channel.id })
+      .then(data => {
+        subject.next(data.body[0]);
+        subject.complete();
+      })
+      .catch(error => {
+        subject.error(error);
+        subject.complete();
+      });
+    return subject.asObservable();
+  }
+
+
+  /**
+   * Removes one channel from db.
+   * @param channel 
+   */
+  deleteOne(channel: Channel): Observable<Channel> {
+    const subject: Subject<Channel> = new Subject();
+    this.supa.client.from<Channel>('channel').delete()
+      .match({ id: channel.id })
+      .then(data => {
+        subject.next(channel);
+        subject.complete();
+      })
+      .catch(error => {
+        subject.error(error);
+        subject.complete();
+      });
+    return subject.asObservable();
+  }
+
+  /**
+   * Creates a channel on the db.
+   * @param channel 
+   */
+  addOne(channel: Channel): Observable<Channel> {
+    const subject: Subject<Channel> = new Subject();
+    this.supa.client.from<Channel>('channel').insert(channel)
+      .then(data => {
+        subject.next(data.body[0]);
+        subject.complete();
+      })
+      .catch(error => {
+        subject.error(error);
+        subject.complete();
+      });
+    return subject.asObservable();
+  }
 }
diff --git a/src/app/api/supabase/channel.ts b/src/app/api/supabase/channel.ts
new file mode 100644
index 0000000..33ac54a
--- /dev/null
+++ b/src/app/api/supabase/channel.ts
@@ -0,0 +1,13 @@
+export class Channel {
+    id: number;
+    name: string;
+    description: string;
+    inserted_at: string | Date;
+    created_by: string;
+
+    constructor(created_by: string, name: string, description?: string) {
+        this.name = name;
+        this.description = description;
+        this.created_by = created_by;
+    }
+}
\ No newline at end of file
diff --git a/src/app/api/supabase/standup.service.ts b/src/app/api/supabase/standup.service.ts
index f67c401..966cdbe 100644
--- a/src/app/api/supabase/standup.service.ts
+++ b/src/app/api/supabase/standup.service.ts
@@ -7,7 +7,6 @@ import { SupaService } from './supa.service';
   providedIn: 'root'
 })
 export class StandupService {
-  // standupMap: Map<number, StandUp> = new Map();
   standupMap = {};
   standups: BehaviorSubject<any> = new BehaviorSubject([]);
   isListening: boolean = false;
@@ -68,7 +67,6 @@ export class StandupService {
    */
   updateStore(standups: StandUp[]) {
     standups.forEach(e => {
-      // this.standupMap.set(e.id, e);
       this.standupMap[e.id] = e;
     });
     this.next();
diff --git a/src/app/sidebar/sidebar.component.html b/src/app/sidebar/sidebar.component.html
index 1d858bd..d835f33 100644
--- a/src/app/sidebar/sidebar.component.html
+++ b/src/app/sidebar/sidebar.component.html
@@ -2,13 +2,12 @@
     <p><strong>Standup</strong> <strong class="newBtn" (click)="createStandUp()">+</strong></p>
     <ul class="list-unstyled">
         <li *ngFor="let s of standups" [title]="s.description" [routerLink]="'/huddle/'+s.id">{{s.name}}</li>
+        <li *ngIf="standups && (standups.length === 0)"><small>There are no standups yet.</small></li>
     </ul>
-    <p><strong>Channel</strong> <strong class="newBtn">+</strong></p>
+    <p><strong>Channel</strong> <strong class="newBtn" (click)="createChannel()">+</strong></p>
     <ul class="list-unstyled">
-        <li>...</li>
-        <li>...</li>
-        <li>...</li>
-        <li>...</li>
+        <li *ngFor="let c of channels" [title]="c.description" [routerLink]="'/channel/'+c.id">{{c.name}}</li>
+        <li *ngIf="channels && (channels.length === 0)"><small>There are no channels yet.</small></li>
     </ul>
     <p><strong>Settings</strong></p>
     <ul class="list-unstyled">
diff --git a/src/app/sidebar/sidebar.component.ts b/src/app/sidebar/sidebar.component.ts
index 74ecec7..4bb6503 100644
--- a/src/app/sidebar/sidebar.component.ts
+++ b/src/app/sidebar/sidebar.component.ts
@@ -3,6 +3,10 @@ import { Observable, throwError } from 'rxjs';
 import { StandUp } from '../api/supabase/standup';
 import { StandupService } from '../api/supabase/standup.service';
 import { environment } from '../../environments/environment';
+import { Channel } from '../api/supabase/channel';
+import { ChannelService } from '../api/supabase/channel.service';
+import { SupaService } from '../api/supabase/supa.service';
+import { User } from '../api/supabase/user';
 
 @Component({
   selector: 'app-sidebar',
@@ -11,10 +15,13 @@ import { environment } from '../../environments/environment';
 })
 export class SidebarComponent implements OnInit {
   standups: StandUp[] = [];
+  channels: Channel[] = [];
   environment = environment;
 
   constructor(
+    private supaService: SupaService,
     private standupSevice: StandupService,
+    private channelService: ChannelService,
   ) { }
 
   ngOnInit() {
@@ -22,12 +29,20 @@ export class SidebarComponent implements OnInit {
       console.log('ChannelListComponent - StandUps', standups);
       this.standups = standups;
     });
+    this.loadChannels().subscribe(channels => {
+      console.log('ChannelListComponent - Channels', channels);
+      this.channels = channels;
+    });
   }
 
   loadStandUps(): Observable<StandUp[]> {    
     return this.standupSevice.getStandUps();
   }
 
+  loadChannels(): Observable<Channel[]> {
+    return this.channelService.getChannels();
+  }
+
   createStandUp() {
     this.standupSevice.addOne(new StandUp('test', 'test')).subscribe(
       data => console.log(data),
@@ -35,4 +50,14 @@ export class SidebarComponent implements OnInit {
     )
   }
 
+  createChannel() {
+    if (!this.supaService.userProfile.id) {
+      return;
+    }
+    this.channelService.addOne(new Channel(this.supaService.userProfile.id, 'test', 'test')).subscribe(
+      data => console.log(data),
+      error => console.error(error)
+    )
+  }
+
 }