#!/usr/bin/env python3

from http import server
from urllib import parse

class SimpleHandler(server.BaseHTTPRequestHandler):

    def do_GET(self):
        self.send_response(200)
        self.end_headers()

        parsed = parse.urlparse(self.path)
        path = parsed.path
        query = parsed.query
        query_components = parse.parse_qsl(query)

        if path == "/":
            msg = self.return_get_components(path, query, query_components)
        elif path == "/ying":
            msg = self.return_ying()
        elif path == "/yang":
            msg = self.return_yang()
        elif path == "/squares":
            msg = self.return_squares(query_components)
        else:
            msg = "Error 404"
        self.wfile.write(msg.encode('utf-8'))

    def return_squares(self, query_components):
        if len(query_components) != 2:
            msg = "Invalid number of Query Components! Two components needed."
        else:
            if query_components[0][0] != 'von' or query_components[1][0] != 'bis':
                msg = "Invalid Query Components! First key has to be 'von', second key 'bis'."
                self.wfile.write(msg.encode('utf-8'))
            else:
                try:
                    von = int(query_components[0][1])
                    bis = int(query_components[1][1])
                except:
                    msg = "One or both query values are not integer."
                else:
                    msg = "<table border='1'>"
                    for i in range(von, bis+1):
                        msg += f"<tr><td>{i}</td><td>{i**2}</td></tr>"
                    msg += "</table>"
        return msg

    
    def return_ying(self):
        msg = "<a href='/yang'>Ying</a>"
        return msg
    
    def return_yang(self):
        msg = "<a href='/ying'>Yang</a>"
        return msg
    
    def return_get_components(self, path, query, query_components):
        msg = f"Path: {path}\nQuery: {query}\nComponents: {str(query_components)}"
        return msg

if __name__ == "__main__":
    port = 60000
    handler = SimpleHandler
    address = ('', port)

    server = server.HTTPServer(address, handler)
    server.serve_forever()