require 'alephant/renderer/views/html'
require 'alephant/renderer/views/json'
require 'alephant/renderer/view_mapper'
require 'alephant/publisher/request/data_mapper_factory'
require 'alephant/publisher/request/data_mapper'
require 'alephant/publisher/request/error'

require 'alephant/support/parser'
require 'alephant/preview/fixture_loader'
require 'alephant/preview/template/base'

require 'sinatra/base'
require "sinatra/reloader"
require 'faraday'
require 'json'
require 'uri'

module Alephant
  module Preview
    class Server < Sinatra::Base
      set :bind, '0.0.0.0'

      register Sinatra::Reloader
      also_reload 'components/*/models/*.rb'
      also_reload 'components/*/mapper.rb'
      also_reload 'components/shared/mappers/*.rb'

      BASE_LOCATION = "#{(ENV['BASE_LOCATION'] || Dir.pwd)}/components"

      before do
        response["Access-Control-Allow-Origin"] = "*"
      end

      get '/preview/:id/:template/:region/?:fixture?' do
        render_preview
      end

      get '/component/:template/?:fixture?' do
        params['id'] = find_id_from_template params['template']
        params['fixture'] = 'responsive' unless params['fixture']
        render_component
      end

      get '/component/:id/:template/?:fixture?' do
        render_component
      end

      post "/components/batch" do
        batch_components = []

        batched_components.each do |component|
          options = component.fetch(:options, {}) || {}
          params["template"] = component.fetch(:component)
          params["id"] = find_id_from_template params["template"]
          params["fixture"] = options.fetch(:fixture, "responsive") || "responsive"
          batch_components << render_batch_component
        end

        { :components => batch_components }.to_json
      end

      get '/status' do
        'ok'
      end

      def find_id_from_template(template)
        files = Dir.glob(BASE_LOCATION + '/**/models/*')
        file = files.select! { |file| file.include? "/#{template}.rb" }.pop
        result = /#{BASE_LOCATION}\/(\w+)/.match(file)
        result[1]
      end

      def render_preview
        Template::Base.new(
          { region => render_component },
          preview_template_location
        ).render
      end

      def render_component
        view_mapper.generate(fixture_data)[template].render
      end

      def render_batch_component
        {
          :component => template,
          :options   => {},
          :status    => 200,
          :body      => render_component
        }
      end

      private

      def request_body
        JSON.parse(request.body.read, :symbolize_names => true) || {}
      end

      def batched_components
        request_body.fetch(:components, [])
      end

      def model
        require model_location
        Alephant::Renderer::Views.get_registered_class(template).new(fixture_data)
      end

      def base_path
        File.join(BASE_LOCATION, id)
      end

      def model_location
        File.join(base_path, 'models', "#{template}.rb")
      end

      def template
        params['template']
      end

      def region
        params['region']
      end

      def id
        params['id']
      end

      def fixture
        params['fixture'] || id
      end

      def fixture_data
        if File.exists? "#{base_path}/mapper.rb"
          loader              = Alephant::Preview::FixtureLoader.new(base_path)
          data_mapper_factory = Alephant::Publisher::Request::DataMapperFactory.new(loader, BASE_LOCATION)
          begin
            data_mapper_factory.create(id, params).data
          rescue Alephant::Publisher::Request::InvalidApiResponse
            raise "The JSON passed to the data mapper isn't valid"
          rescue StandardError => e
            puts e.backtrace
            raise "There was an issue with the data mapper class: #{e.message}"
          end
        else
          msg = Struct.new(:body)
            .new(raw_fixture_data)
          parser.parse msg
        end
      end

      def raw_fixture_data
        File.open(fixture_location).read
      end

      def parser
        @parser ||= ::Alephant::Support::Parser.new
      end

      def fixture_location
        "#{base_path}/fixtures/#{fixture}.json"
      end

      def preview_template_location
        "#{Template.path}/templates/preview.mustache"
      end

      def view_mapper
        Alephant::Renderer::ViewMapper.new(id, BASE_LOCATION)
      end

    end
  end
end