require 'yaml'

class CrossPost
	class Config
		DEFAULT_CONFIG = File.join Dir.home, '.config/cross-post/config.yml'

		def initialize
			@file = ENV.fetch 'CROSS_POST_CONFIG', DEFAULT_CONFIG
			raise 'Unable to find config file' unless File.readable? @file
			File.open(@file) { |f| @config = YAML.safe_load f }
		end

		def [](key)
			current = @config
			key.split(/\./).each do |k|
				current = current[k]
				return nil if current.nil?
			end
			current
		end

		def []=(key, value)
			*key, last = key.split(/\./)
			current    = @config
			key.each do |k|
				next_ = current[k]
				case next_
				when nil
					next_ = current[k] = {}
				when Hash
				else
					raise "Invalid entry, Hash expected, had #{next_.class} (#{next_})"
				end
				current = next_
			end
			current[last] = value
		end

		def save
			File.write @file, YAML.dump(@config)
		end
	end
end