Updated create playlist dialog to not require a type to be set prior

- duration and registered variables are now set for playlists

src/app/create-playlist/create-playlist.component.ts

@@ -14,6 +14,8 @@ export class CreatePlaylistComponent implements OnInit {
   filesToSelectFrom = null;
   type = null;
   filesSelect = new FormControl();
+  audiosToSelectFrom = null;
+  videosToSelectFrom = null;
   name = '';
 
   create_in_progress = false;
@@ -28,12 +30,30 @@ export class CreatePlaylistComponent implements OnInit {
       this.filesToSelectFrom = this.data.filesToSelectFrom;
       this.type = this.data.type;
     }
+
+    if (!this.filesToSelectFrom) {
+      this.getMp3s();
+      this.getMp4s();
+    }
+  }
+
+  getMp3s() {
+    this.postsService.getMp3s().subscribe(result => {
+      this.audiosToSelectFrom = result['mp3s'];
+    });
+  }
+
+  getMp4s() {
+    this.postsService.getMp4s().subscribe(result => {
+      this.videosToSelectFrom = result['mp4s'];
+    });
   }
 
   createPlaylist() {
     const thumbnailURL = this.getThumbnailURL();
+    const duration = this.calculateDuration();
     this.create_in_progress = true;
-    this.postsService.createPlaylist(this.name, this.filesSelect.value, this.type, thumbnailURL).subscribe(res => {
+    this.postsService.createPlaylist(this.name, this.filesSelect.value, this.type, thumbnailURL, duration).subscribe(res => {
       this.create_in_progress = false;
       if (res['success']) {
         this.dialogRef.close(true);
@@ -44,8 +64,12 @@ export class CreatePlaylistComponent implements OnInit {
   }
 
   getThumbnailURL() {
-    for (let i = 0; i < this.filesToSelectFrom.length; i++) {
-      const file = this.filesToSelectFrom[i];
+    let properFilesToSelectFrom = this.filesToSelectFrom;
+    if (!this.filesToSelectFrom) {
+      properFilesToSelectFrom = this.type === 'audio' ? this.audiosToSelectFrom : this.videosToSelectFrom;
+    }
+    for (let i = 0; i < properFilesToSelectFrom.length; i++) {
+      const file = properFilesToSelectFrom[i];
       if (file.id === this.filesSelect.value[0]) {
         // different services store the thumbnail in different places
         if (file.thumbnailURL) { return file.thumbnailURL };
@@ -55,4 +79,35 @@ export class CreatePlaylistComponent implements OnInit {
     return null;
   }
 
+  getDuration(file_id) {
+    let properFilesToSelectFrom = this.filesToSelectFrom;
+    if (!this.filesToSelectFrom) {
+      properFilesToSelectFrom = this.type === 'audio' ? this.audiosToSelectFrom : this.videosToSelectFrom;
+    }
+    for (let i = 0; i < properFilesToSelectFrom.length; i++) {
+      const file = properFilesToSelectFrom[i];
+      if (file.id === file_id) {
+        return file.duration;
+      }
+    }
+    return null;
+  }
+
+  calculateDuration() {
+    let sum = 0;
+    for (let i = 0; i < this.filesSelect.value.length; i++) {
+      const duration_val = this.getDuration(this.filesSelect.value[i]);
+      sum += typeof duration_val === 'string' ? this.durationStringToNumber(duration_val) : duration_val;
+    }
+    return sum;
+  }
+
+  durationStringToNumber(dur_str) {
+    let num_sum = 0;
+    const dur_str_parts = dur_str.split(':');
+    for (let i = dur_str_parts.length-1; i >= 0; i--) {
+      num_sum += parseInt(dur_str_parts[i])*(60**(dur_str_parts.length-1-i));
+    }
+    return num_sum;
+  }
 }