class MoviesController < ApplicationController

  def movie_params
    params.require(:movie).permit(:title, :rating, :description, :release_date)
  end

  def show
    id = params[:id] # retrieve movie ID from URI route
    @movie = Movie.find(id) # look up movie by unique ID
    # will render app/views/movies/show.<extension> by default
  end

  def index
    @all_ratings = Array.new
    Movie.select(:rating).distinct.each do |movie|
      @all_ratings.push movie.rating
    end
    @ratings = params[:ratings] ? params[:ratings].keys : @all_ratings
    @ratings.delete("hidden")
    @movies = Movie.where(:rating => @ratings)
  end

  def sort
    index
    @order = params[:order]
    if !@order  #如果order参数不存在,默认增序
      @order = "increase"
    end
    
    @keyword = params[:keyword]
    if @keyword #是对哪个关键字排序
      @movies = @movies.order("#{@keyword}#{@order == 'increase' ? '' : ' DESC'}")
      @order = @order == "increase" ? "decrease" : "increase"
    end
    render 'movies/index'
  end

  def new
    # default: render 'new' template
  end

  def create
    @movie = Movie.create!(movie_params)
    flash[:notice] = "#{@movie.title} was successfully created."
    redirect_to movies_path
  end

  def edit
    @movie = Movie.find params[:id]
  end

  def update
    @movie = Movie.find params[:id]
    @movie.update_attributes!(movie_params)
    flash[:notice] = "#{@movie.title} was successfully updated."
    redirect_to movie_path(@movie)
  end

  def destroy
    @movie = Movie.find(params[:id])
    @movie.destroy
    flash[:notice] = "Movie '#{@movie.title}' deleted."
    redirect_to movies_path
  end
end

-#  This file is app/views/movies/index.html.haml
%h1 All Movies
= form_tag movies_path, :method => :get do
  Include:
  - @all_ratings.each do |rating|
    = rating
    = check_box_tag "ratings[#{rating}]", "1", (@ratings.include? rating)
  = check_box_tag "ratings[hidden]", "1", true, hidden:true
  = submit_tag 'Refresh'
%table#movies
  %thead
    - sorted_css = @order ? " sorted-#{@order}" : ""
    - @order = @order ? @order : "increase"
    %tr
      %th{:class => "linked#{@keyword == 'title' ? sorted_css : ''}"}= link_to "Movie Title", movies_sort_path(:keyword => 'title', :order => @order, :ratings => params[:ratings])
      %th Rating
      %th{:class => "linked#{@keyword == 'release_date' ? sorted_css : ''}"}= link_to "Release Date", movies_sort_path(:keyword => 'release_date', :order => @order, :ratings => params[:ratings])
      %th More Info
  %tbody
    - @movies.each do |movie|
      %tr
        %td= movie.title 
        %td= movie.rating
        %td= movie.release_date
        %td= link_to "More about #{movie.title}", movie_path(movie)

= link_to 'Add new movie', new_movie_path

Rails.application.routes.draw do
  get 'movies/sort', to: 'movies#sort' 
  
  resources :movies do
  end

  root 'movies#index'
end

table#movies th.linked
{
  padding: 0px;  
}

table#movies th a {
  padding: 4px;
  display: block;
}

table#movies th a:hover {
  background-color:rgb(255, 125, 0);
  cursor: pointer;
}

table#movies th.sorted-increase {
  background-color:rgb(255, 165, 0);
}

table#movies th.sorted-decrease {
  background-color:rgb(255, 235, 0);
}