# Generated from
# rails g scaffold Book title author_name year_published:integer isbn:integer primary_topic fictionaility

class Book < ApplicationRecord
  FORM_TURBO_FRAME_ID = 'book_multi_step_form'

  enum form_steps: {
    basics: [:title, :author_name],
    organizational: [:year_published, :isbn],
    details: [:primary_topic, :fictionaility]
  }
  attr_accessor :form_step

  with_options if: -> { required_for_step?(:basics) } do
    validates :title, presence: true
    validates :author_name, presence: true
  end

  with_options if: -> { required_for_step?(:organizational) } do
    validates :year_published, presence: true, numericality: { greater_than: 1950 }
    # isbn not required
  end

  with_options if: -> { required_for_step?(:details) } do
    # primary topic not required
    validates :fictionaility, presence: true
  end

  # Checks current step to enable or disable validations appropriately
  def required_for_step?(step)
    # All fields are required if no form step is present
    return true if form_step.nil?
  
    # All fields from previous steps are required
    ordered_keys = self.class.form_steps.keys.map(&:to_sym)
    !!(ordered_keys.index(step) <= ordered_keys.index(form_step))
  end
end

resources :books
resources :build_book, only: [] do
  resources :step, only: [:update, :show], controller: 'steps_controllers/book_steps'
end

class BooksController < ApplicationController
  before_action :set_book, only: %i[ show edit update destroy ]

  # GET /books or /books.json
  def index
    @books = Book.all
  end

  # GET /books/1 or /books/1.json
  def show
  end

  # GET /books/new
  def new
    book_builder_key = Random.urlsafe_base64(6)                                       # Only non-vanilla-Rails code here
    Rails.cache.fetch(book_builder_key) { Hash.new }                                  # Only non-vanilla-Rails code here
    redirect_to build_book_step_path(book_builder_key, Book.form_steps.keys.first)    # Only non-vanilla-Rails code here
  end

  # GET /books/1/edit
  def edit
  end

  # POST /books or /books.json
  def create
    @book = Book.new(book_params)

    respond_to do |format|
      if @book.save
        format.html { redirect_to @book, notice: "Book was successfully created." }
        format.json { render :show, status: :created, location: @book }
      else
        format.html { render :new, status: :unprocessable_entity }
        format.json { render json: @book.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /books/1 or /books/1.json
  def update
    respond_to do |format|
      if @book.update(book_params)
        format.html { redirect_to @book, notice: "Book was successfully updated." }
        format.json { render :show, status: :ok, location: @book }
      else
        format.html { render :edit, status: :unprocessable_entity }
        format.json { render json: @book.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /books/1 or /books/1.json
  def destroy
    @book.destroy
    respond_to do |format|
      format.html { redirect_to books_url, notice: "Book was successfully destroyed." }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_book
      @book = Book.find(params[:id])
    end

    # Only allow a list of trusted parameters through.
    def book_params
      params.require(:book).permit(:title, :author_name, :year_published, :isbn, :primary_topic, :fictionaility)
    end
end

module StepsControllers
  class BookStepsController < ApplicationController
    include Wicked::Wizard

    steps *Book.form_steps.keys

    def show
      book_attrs = Rails.cache.read params[:build_book_id]
      @book = Book.new book_attrs
      render_wizard
    end

    def update
      book_attrs = Rails.cache.read(params[:build_book_id]).merge book_params
      @book = Book.new book_attrs

      if @book.valid?
        Rails.cache.write params[:build_book_id], book_attrs
        redirect_to_next next_step
      else
        render_wizard nil, status: :unprocessable_entity
      end
    end

    private

    def book_params
      params.require(:book).permit(Book.form_steps[step]).merge(form_step: step.to_sym)
    end

    def finish_wizard_path
      book_attrs = Rails.cache.read(params[:build_book_id])
      @book = Book.new book_attrs
      @book.save!
      Rails.cache.delete params[:build_book_id]
      book_path(@book)
    end
  end
end

<%= turbo_frame_tag dom_id(@book) do %>
  <%= form_with model: @book, url: wizard_path, method: :patch do |f| %>
    <% if f.object.errors.any? %>
      <div class="error_messages">
        <% f.object.errors.full_messages.each do |error| %>
          <p><%= error %></p>
        <% end %>
      </div>
    <% end %>

    <fieldset>
      <legend>Book Basics</legend>

      <div>
        <%= f.label :title %>
        <%= f.text_field :title %>
      </div>

      <div>
        <%= f.label :author_name %>
        <%= f.text_field :author_name %>
      </div>

      <br/>

      <div>
        <%= link_to 'Nevermind', books_path, data: { turbo_frame: :_top } %> <%# NOTE the _top target %>
        <%= f.submit 'Next Step' %>
      </div>
    </fieldset>
  <% end %>
<% end %>

<%= turbo_frame_tag dom_id(@book) do %>
  <%= form_with model: @book, url: wizard_path, method: :patch do |f| %>
    <% if f.object.errors.any? %>
      <div class="error_messages">
        <% f.object.errors.full_messages.each do |error| %>
          <p><%= error %></p>
        <% end %>
      </div>
    <% end %>

    <fieldset>
      <legend>Book Organizing Details</legend>

      <div>
        <%= f.label :year_published %>
        <%= f.number_field :year_published %>
      </div>

      <div>
        <%= f.label :isbn %>
        <%= f.number_field :isbn %>
      </div>

      <br/>

      <div>
        <%= link_to 'Previous Step', previous_wizard_path %>
        <%= f.submit 'Continue' %>
      </div>
    </fieldset>
  <% end %>
<% end %>

<%= turbo_frame_tag dom_id(@book) do %>
  <%= form_with model: @book, url: wizard_path, method: :patch, data: { turbo_frame: :_top } do |f| %> <%# NOTE the _top target %>
    <% if f.object.errors.any? %>
      <div class="error_messages">
        <% f.object.errors.full_messages.each do |error| %>
          <p><%= error %></p>
        <% end %>
      </div>
    <% end %>

    <fieldset>
      <legend>Book Details</legend>

      <div>
        <%= f.label :primary_topic %>
        <%= f.text_field :primary_topic %>
      </div>

      <div>
        <%= f.label :fictionaility %>
        <%= f.text_field :fictionaility %>
      </div>

      <br/>

      <div>
        <%= link_to 'Previous Step', previous_wizard_path %>
        <%= f.submit 'Complete' %>
      </div>
    </fieldset>
  <% end %>
<% end %>