Streams listing with language and difficulty filters

src/Deblan/Command/ListCommand.php

@@ -15,16 +15,34 @@ class ListCommand extends Command
         $this
             ->setName('streams')
             ->setDescription('List available streams.')
-            ->addOption('category', null, InputOption::VALUE_REQUIRED, '')
+            ->addOption('language', null, InputOption::VALUE_REQUIRED, '')
+            ->addOption('difficulty', null, InputOption::VALUE_REQUIRED, '')
             ->setHelp("The <info>%command.name%</info> lists live streams");
     }
 
     protected function execute(InputInterface $input, OutputInterface $output)
     {
         $liveCoding = $this->getApplication()->getContainer()['livecoding'];
+        $languages = $liveCoding->getLanguages();
+        $difficulties = $liveCoding->getDifficulties();
+
+        $language = $input->getOption('language');
+        $difficulty = $input->getOption('difficulty');
+
+        if (in_array($language, $languages)) {
+            $language = array_keys($languages, $language)[0];
+        } elseif (!in_array($language, array_keys($languages))) {
+            $language = null;
+        }
+
+        if (in_array($difficulty, array_keys($difficulties))) {
+            $difficulty = $difficulties[$difficulty];
+        } elseif (!in_array($difficulty, $difficulties)) {
+            $difficulty = null;
+        }
 
         try {
-            $streams = $liveCoding->getStreams();
+            $streams = $liveCoding->getStreams($language, $difficulty);
 
             foreach ($streams as $stream) {
                 $output->writeln(sprintf(

src/Deblan/Helper/LiveCoding.php

@@ -18,9 +18,41 @@ class LiveCoding
         $this->app = $app;
     }
 
-    public function getStreams($category = null)
+    public function getLanguages()
     {
-        $content = file_get_contents($this->app->buildUrl('livestreams/'));
+        return [
+            'objc-swift-ios' => 'Obj-C/Swift (iOS)',
+            'java' => 'Java',
+            'android' => 'Android',
+            'c-cplusplus' => 'C/C++',
+            'csharp-dotnet' => 'C#/.NET',
+            'python' => 'Python',
+            'javascript' => 'JavaScript',
+            'php' => 'PHP',
+            'ruby"' => 'Ruby',
+            'sql"' => 'SQL',
+            'html-css' => 'HTML/CSS',
+            'others' => 'Others',
+        ];
+    }
+
+    public function getDifficulties()
+    {
+        return [
+            1 => 'beginner',
+            2 => 'intermediate',
+            3 => 'expert',
+        ];
+    }
+
+    public function getStreams($language = null, $difficulty = null)
+    {
+
+        $content = file_get_contents($this->app->buildUrl(sprintf(
+            'livestreams/%s%s',
+            $language !== null ? $language.'/' : 'all',
+            $difficulty !== null ? $difficulty.'/' : null
+        )));
 
         preg_match_all(
             '`<div class="small-video-box">(.+)\s+</div>`isU',