require "addressable/template"
require "async/http/internet/instance"

namespace "neopets:import" do
	desc "Import all basic image hashes from the Rainbow Pool, onto PetTypes"
	task :rainbow_pool => :environment do
		neologin = STDIN.getpass("Neologin cookie: ")

		puts "Importing from Rainbow Pool…"

		all_pet_types = PetType.all.to_a
		all_pet_types_by_species_id_and_color_id = all_pet_types.
			to_h { |pt| [[pt.species_id, pt.color_id], pt] }
		all_colors_by_name = Color.all.to_h { |c| [c.human_name.downcase, c] }

		# TODO: Do these in parallel? I set up the HTTP requests to be able to
		#       handle it, and just didn't set up the rest of the code for it, lol
		Species.order(:name).each do |species|
			begin
				hashes_by_color_name = RainbowPool.load_hashes_for_species(
					species.id, neologin)
			rescue => error
				puts "Failed to load #{species.name} page, skipping: #{error.message}"
				next
			end

			changed_pet_types = []

			hashes_by_color_name.each do |color_name, image_hash|
				color = all_colors_by_name[color_name.downcase]
				if color.nil?
					puts "Skipping unrecognized color name: #{color_name}"
					next
				end

				pet_type = all_pet_types_by_species_id_and_color_id[
					[species.id, color.id]]
				if pet_type.nil?
					puts "Skipping unrecognized pet type: " +
							 "#{color_name} #{species.human_name}"
					next
				end

				if pet_type.basic_image_hash.nil?
					puts "Found new image hash: #{image_hash} (#{pet_type.human_name})"
					pet_type.basic_image_hash = image_hash
					changed_pet_types << pet_type
				elsif pet_type.basic_image_hash != image_hash
					puts "Updating image hash: #{image_hash} ({#{pet_type.human_name})"
					pet_type.basic_image_hash = image_hash
					changed_pet_types << pet_type
				else
					# No need to do anything with image hashes that match!
				end
			end

			PetType.transaction { changed_pet_types.each(&:save!) }
			puts "Saved #{changed_pet_types.size} image hashes for " +
			     "#{species.human_name}"
		end
	end
end

module RainbowPool
	# Share a pool of persistent connections, rather than reconnecting on
	# each request. (This library does that automatically!)
	INTERNET = Async::HTTP::Internet.instance

	class << self
		SPECIES_PAGE_URL_TEMPLATE = Addressable::Template.new(
			"https://www.neopets.com/pool/all_pb.phtml{?f_species_id}"
		)
		def load_hashes_for_species(species_id, neologin)
			Sync do
				url = SPECIES_PAGE_URL_TEMPLATE.expand(f_species_id: species_id)
				INTERNET.get(url, [
					["User-Agent", Rails.configuration.user_agent_for_neopets],
					["Cookie", "neologin=#{neologin}"],
				]) do |response|
					if response.status != 200
						raise "expected status 200 but got #{response.status} (#{url})"
					end

					parse_hashes_from_page response.read
				end
			end
		end

		private

		IMAGE_HASH_PATTERN = %r{
			set_pet_img\(
				'https?://pets\.neopets\.com/cp/(?<hash>[0-9a-z]+)/[0-9]+/[0-9]+\.png',
				\s*
				'(?<color_name>.+?)'
			\)
		}x
		def parse_hashes_from_page(html)
			html.scan(IMAGE_HASH_PATTERN).to_h do |(image_hash, color_name)|
				[color_name, image_hash]
			end
		end
	end
end