app.rb

# Require items from Bundler
require 'bundler'
Bundler.require

# Load configuration from file
config_file 'data/config.yml'

# Constants
IMAGE_PATH  = 'https://image.tmdb.org/t/p/'.freeze
MOVIE_PATH  = 'data/movies.json'.freeze
POSTER_PATH = 'data/posters.json'.freeze

# Authenticate with TMDb API
TMDb.api_key = settings.tmdb_key

# On '/' page, do this...
get '/' do
  # Get sorting order from query parameters
  sort = params['sort']

  # Open movie file, and return JSON to the page
  File.open(MOVIE_PATH) do |f|
    @movies = JSON.parse(f.read)
  end
  # Open poster file, and return JSON to the page
  File.open(POSTER_PATH) do |f|
    @posters = JSON.parse(f.read)
  end

  # If 'asc', sort alphabetically
  if sort == 'asc'
    @movies  = @movies.sort_by  { |e| e[0].to_s }
    @posters = @posters.sort_by { |e| e.keys[0].to_s }
  # Or sort it backwards
  elsif sort == 'desc'
    @movies  = @movies.sort_by  { |e| e[0].to_s }.reverse
    @posters = @posters.sort_by { |e| e.keys[0].to_s }.reverse
  end

  # Render views/index.erb
  erb :index
end

# On '/search?movie=title' or '/add?movie=title', do this...
get ['/search', '/add'] do
  # Get movie title from query parameters
  query = params['movie']

  # Return result to page
  @result = TMDb::Movie.search(query).first

  # If on '/add', actually add the poster path to the JSON file
  if request.path_info == '/add'
    # Builds temporary hashes for storing the images
    poster_hash = { @result.title => "#{IMAGE_PATH}w500#{@result.poster_path}" }

    # Opens JSON file for reading
    poster_json = JSON[File.read(POSTER_PATH)]
    poster_json = [poster_json] if poster_json.class != Array

    # Append hash to JSON file
    File.open(POSTER_PATH, 'w') do |f|
      f.write(JSON.pretty_generate(poster_json << poster_hash))
    end
  end

  # Render views/result.erb
  erb :result
end