# Request class used as instance object of an incoming TCP request to manage that request. Splits the request into it's method, resource, version, headers and params to be read by the router.
class Request
    attr_reader :method, :resource, :version, :headers, :params

    # @param input [String] the string of the request
    def initialize(input)
        variable_definer(input)
    end

    private 
    
    # Defines required class variables by splitting up the input text
    #
    # @param input [String] the string of the request
    def variable_definer(input) 
        rows = input.split(/\r\n/)
        @method, @resource, @version = rows[0].split(' ')
        @headers, @params = {}, {}
        if rows.find_index("") != nil then
            limit = rows.find_index("")
        else
            limit = rows.length
        end
        header_constructor(rows, limit)
        if limit != rows.length
            param_constructor(rows)
        end
        if @resource.include?("?")
            resource_deconstructor
        end
    end

    # Reorganizes the information in the header based on the format
    #
    # @param rows [Array] A list of the rows in the header
    # @param limit [Int] The limit where the header ends.
    def header_constructor(rows, limit)
        for row in rows[1..limit-1]
            context, information = row.split(' ')
            context = context.sub(/:/, "")
            @headers[context] = information
        end
    end

    # Organizes the parameter information into a dict of parameters
    #
    # @param rows [Array] A list of the rows of parameters
    def param_constructor(rows)
        for row in rows[rows.find_index("")+1..rows.length]
            information = row.split(/&/)
            for info in information
                context, content = info.split('=')
                @params[context] = content
            end
        end
    end
    
    # Organizes the resource information into a dict of resource parameters
    def resource_deconstructor
        information = @resource.split('?')[1].split(/&/)
        for info in information
            context, content = info.split('=')
            @params[context] = content
        end
    end
end