VRFS-3936 rake task to generate mobile jtx json file

web/lib/tasks/mobile.rake

@@ -0,0 +1,98 @@
+require 'csv'
+
+namespace :mobile do
+
+  task :jam_tracks_json => :environment do |task, args|
+    fname = 'all-jamkazam-jamtracks.csv'
+    tmp_fname = "/tmp/#{fname}"
+
+    File.delete(tmp_fname) if File.exists?(tmp_fname)
+
+    unless File.exists?(tmp_fname)
+      cmd = "curl -s https://s3.amazonaws.com/jamkazam-public/public/lists/#{fname} > #{tmp_fname}"
+      `#{cmd}`
+    end
+
+    if File.exists?(tmp_fname)
+
+      jtx_json = {
+        jtx_data: [],
+        jtx_indices: {
+          alphanum: {
+            A: [],
+            B: [],
+            C: [],
+            D: [],
+            E: [],
+            F: [],
+            G: [],
+            H: [],
+            I: [],
+            J: [],
+            K: [],
+            L: [],
+            M: [],
+            N: [],
+            O: [],
+            P: [],
+            Q: [],
+            R: [],
+            S: [],
+            T: [],
+            U: [],
+            V: [],
+            W: [],
+            X: [],
+            Y: [],
+            Z: [],
+            '#': [],
+          },
+          artist: {},
+        }
+      }
+
+      CSV.foreach(tmp_fname) do |row|
+        jtartist = row[0]
+        jtname = row[1]
+        jt = JamTrack.
+             where(name: jtname, original_artist: jtartist).
+             limit(1).
+             first
+        next if jt.blank?
+        
+        jtdata = {
+          artist: jtartist,
+          genre: jt.genres.map(&:description).join(', '),
+          id: jt.id,
+          name: jtname,
+          plan_code: jt.plan_code,
+          year: jt.year
+        }
+        jtx_json[:jtx_data] << jtdata
+        indices = jtx_json[:jtx_indices]
+
+        first_char = jtartist[0]
+        if (1..9) === first_char.to_i || '0' == first_char
+          indices[:alphanum][:'#'] << jtdata
+        else
+          indices[:alphanum][first_char.to_sym] << jtdata
+        end
+        
+        idx_artist = indices[:artist][jtartist]
+        unless idx_artist
+          idx_artist = []
+          indices[:artist][jtartist] = idx_artist
+        end
+        idx_artist << jtdata
+      end
+
+      puts jtx_json.to_json
+      
+    else
+      puts "*** ERROR: download failed:  `#{cmd}`"
+    end
+    
+  end
+
+end
+