bertrandk/botr

module BOTR

    # The BOTR::ChannelThumbnail class contains calls that can be used to upload
    # a preview image for a channel. Channels don’t have a thumb by default.
    class ChannelThumbnail < BOTR::Object

        class << self

            attr_reader :last_status

            # Show channel thumbnails creation status.
            #
             # @param [String] channel_key key of the channel for which to show
             #  thumbnails creation status
             #
             # @return [BOTR::ChannelThumbnail] a new object with the thumbnail
             #  properties of the channel referenced by the channel key
            def show(channel_key)
                json = get_request({:method => 'show',
                                    :channel_key => channel_key})
                res = JSON.parse(json.body)

                if json.status == 200
                    params = process_show_response(res)
                else
                    raise "HTTP Error #{json.status}: #{json.body}"
                end

                return new(params)
            end

            alias :find :show

            private

                def process_show_response(body)
                    @last_status = body["status"]

                    return body["thumbnail"]
                end

        end

        attr_reader :last_status, :key, :status, :error

        def initialize(params = {})
            params.each do |key, val|
                param = "@#{key.to_s}"
                next unless methods.include? key.to_sym
                instance_variable_set(param, val)
            end
            
            raise ArgumentError, "You must specify a channel key." if @key.nil?
        end

        # Update a channel thumbnail by uploading an image.
        #
        # @return [BOTR::ChannelThumbnail] this object with an upload URL
        def update
            json = put_request({:channel_key => @key})
            res = JSON.parse(json.body)

            if json.status == 200
                process_update_response(res)
            else
                raise "HTTP Error #{json.status}: #{json.body}"
            end
            
            return self
        end

        def upload(data_path, **options)
            json = post_request(options, data_path)
            res = JSON.parse(json.body)

            if json.status == 200
                process_upload_response(res)
            else
                raise "HTTP Error #{json.status}: #{json.body}"
            end

            return self
        end

        private

            def process_update_response(body)
                @last_status = body["status"]
                @key = body["media"]["key"]
                @link = body["link"]
            end

            def process_upload_response(body)
                @last_status = body["status"]
                @file = body["file"]
            end

    end

end