module ExploreCourses

# File lib/explorecourses/base.rb, line 9
def self.check_xml_version
    request = Typhoeus::Request.new(URL_BASE_SEARCH, params: { view: XML_VERSION })
    request.run
    response = request.response
    if response
        doc = Nokogiri::XML(response.body)
        return { deprecated: doc.at_xpath("//deprecated").content,
                latest_version: doc.at_xpath("//latestVersion").content}
    end
end

# File lib/explorecourses/base.rb, line 20
def self.query_courses(query)
    params = {
        view: XML_VERSION,
        q: query
    }
    request = Typhoeus::Request.new(URL_BASE_SEARCH, params: params)
    request.run
    response = request.response
    if response
        doc = Nokogiri::XML(response.body)
        # use XPath to navigate the XML body
        courses_xml = doc.xpath(".//course")
        courses = []
        courses_xml.each do |course_xml|
            year = course_xml.at_xpath(".//year").content
            subject = course_xml.at_xpath(".//subject").content
            code = course_xml.at_xpath(".//code").content
            title = course_xml.at_xpath(".//title").content
            description = course_xml.at_xpath(".//description").content
            gers = course_xml.at_xpath(".//gers").content
            repeatable = course_xml.at_xpath(".//repeatable").content
            grading = course_xml.at_xpath(".//grading").content
            units_min = course_xml.at_xpath(".//unitsMin").content
            units_max = course_xml.at_xpath(".//unitsMax").content
            sections = retrieve_sections(course_xml.xpath(".//section"))
            courses << Course.new(year, subject, code, title, description, gers, repeatable,
                    grading, units_min, units_max, sections)
        end
        return courses
    end
end

# File lib/explorecourses/base.rb, line 97
def self.retrieve_instructors(instructors_xml)
    instructors = []
    instructors_xml.each do |instructor_xml|
        name = instructor_xml.at_xpath(".//name").content
        first_name = instructor_xml.at_xpath(".//firstName").content
        middle_name = instructor_xml.at_xpath(".//middleName").content
        last_name = instructor_xml.at_xpath(".//lastName").content
        sunet = instructor_xml.at_xpath(".//sunet").content
        role = instructor_xml.at_xpath(".//role").content
        instructors << Instructor.new(name, first_name, middle_name, last_name, sunet, role)
    end
    return instructors
end

# File lib/explorecourses/base.rb, line 81
def self.retrieve_schedules(schedules_xml)
    schedules = []
    schedules_xml.each do |schedule_xml|
        start_date = schedule_xml.at_xpath(".//startDate").content
        end_date = schedule_xml.at_xpath(".//endDate").content
        start_time = schedule_xml.at_xpath(".//startTime").content
        end_time = schedule_xml.at_xpath(".//endTime").content
        location = schedule_xml.at_xpath(".//location").content
        # Cleaning up after whoever put all the \t and \n in the string...
        days = schedule_xml.at_xpath("./days").content.gsub(/[\t\n]/, ' ').split.join(',')
        instructors = retrieve_instructors(schedule_xml.xpath(".//instructor"))
        schedules << Schedule.new(start_date, end_date, start_time, end_time, location, days, instructors)
    end
    return schedules
end

# File lib/explorecourses/base.rb, line 54
def self.retrieve_sections(sections_xml)
    sections = []
    sections_xml.each do |section_xml|
        class_id = section_xml.at_xpath(".//classId").content
        term = section_xml.at_xpath(".//term").content
        term_id = section_xml.at_xpath(".//termId").content
        subject = section_xml.at_xpath(".//subject").content
        code = section_xml.at_xpath(".//code").content
        units = section_xml.at_xpath(".//units").content
        section_number = section_xml.at_xpath(".//sectionNumber").content
        component = section_xml.at_xpath(".//component").content
        num_enrolled = section_xml.at_xpath(".//numEnrolled").content
        max_enrolled = section_xml.at_xpath(".//maxEnrolled").content
        num_waitlist = section_xml.at_xpath(".//numWaitlist").content
        max_waitlist = section_xml.at_xpath(".//maxWaitlist").content
        enroll_status = section_xml.at_xpath(".//enrollStatus").content
        add_consent = section_xml.at_xpath(".//addConsent").content
        drop_consent = section_xml.at_xpath(".//dropConsent").content
        course_id = section_xml.at_xpath(".//courseId").content
        schedules = retrieve_schedules(section_xml.xpath(".//schedule"))
        sections << Section.new(class_id, term, term_id, subject, code, units, section_number, component, 
                num_enrolled, max_enrolled, num_waitlist, max_waitlist, enroll_status, add_consent, 
                drop_consent, course_id, schedules)
    end
    return sections
end