# Copyright, 2019, by Samuel G. D. Williams. <http://www.codeotaku.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# THE SOFTWARE.

require 'async'
require 'async/rest/representation'

require 'securerandom'

module Covered
	class Coveralls
		class Wrapper < Async::REST::Wrapper::JSON
			def prepare_request(payload, headers)
				headers['accept'] ||= @content_type
				boundary = SecureRandom.hex(32)
				
				# This is a pretty messed up API. Don't change anything below. It's fragile.
				if payload
					headers['content-type'] = "multipart/form-data, boundary=#{boundary}"
					
					Async::HTTP::Body::Buffered.new([
						"--#{boundary}\r\n",
						"Content-Disposition: form-data; name=\"json_file\"; filename=\"body.json\"\r\n",
						"Content-Type: text/plain\r\n\r\n",
						::JSON.dump(payload),
						"\r\n--#{boundary}--\r\n",
					])
				end
			end
		end
		
		URL = "https://coveralls.io/api/v1/jobs"
		
		def initialize(token: nil, service: nil, job_id: nil)
			@token = token
		end
		
		def detect_service
			if token = ENV.fetch('COVERALLS_REPO_TOKEN', @token)
				return {"repo_token" => token}
			elsif @service && @job_id
				return {"service_name" => @service, "service_job_id" => @job_id}
			elsif job_id = ENV['TRAVIS_JOB_ID']
				return {"service_name" => "travis-ci", "service_job_id" => job_id}
			else
				warn "#{self.class} can't detect service! Please specify COVERALLS_REPO_TOKEN."
			end
			
			return nil
		end
		
		def call(wrapper, output = $stderr)
			if body = detect_service
				output.puts "Submitting data using #{body.inspect}..."
				
				source_files = []
				
				wrapper.each do |coverage|
					path = wrapper.relative_path(coverage.path)
					
					source_files << {
						name: path,
						source_digest: Digest::MD5.hexdigest(coverage.read),
						coverage: coverage.to_a,
					}
				end
				
				body[:source_files] = source_files
				
				Async do
					representation = Async::REST::Representation.new(
						Async::REST::Resource.for(URL),
						wrapper: Wrapper.new
					)
					
					begin
						response = representation.post(body)
						
						output.puts "Got response: #{response.read}"
						
					ensure
						representation.close
					end
				end
			end
		end
	end
end