#!/usr/bin/env python

import configparser
import glob
import os
import sys

from formats.SctEseFormat import SctEseFormat

class Airport:
    def findGngData(data, path):
        if None == data.get('gngwildcard'):
            return None, None

        # find the newest ESE file
        files = glob.glob(os.path.join(path, data['gngwildcard'] + '.ese'))
        latestEse = max(files, key=os.path.getctime)

        # search for the corresponding SCT file
        latestSct = os.path.splitext(latestEse)[0] + '.sct'

        # check if the files exist
        if False == os.path.isfile(latestEse) or False == os.path.isfile(latestSct):
            return None, None

        return latestSct, latestEse

    def parsePlanning(self, planning):
        if None == planning.get('routes'):
            return []
        return planning['routes'].split(':')

    def __init__(self, filepath : str, icao : str):
        self.arrivalRoutes = {}

        config = configparser.ConfigParser()
        config.read(filepath)

        dataConfig = None
        planningConfig = None

        # search the required sections
        for key in config:
            if 'DATA' == key:
                dataConfig = config['DATA']
            elif 'PLANNING' == key:
                planningConfig = config['PLANNING']

        # find the GNG-file data
        sctFile, eseFile = Airport.findGngData(dataConfig, os.path.dirname(filepath))
        if None == sctFile or None == eseFile:
            sys.stderr.write('No GNG-files found')
            sys.exit(-1)

        # parse the planning information
        if None == planningConfig or False == self.parsePlanning(planningConfig):
            sys.stderr.write('No planning configuration found')
            sys.exit(-1)
        requiredArrivalRoutes = self.parsePlanning(planningConfig)
        if 0 == len(requiredArrivalRoutes):
            sys.stderr.write('No valid planning configuration found')
            sys.exit(-1)

        # parse the GNG data
        print('Used GNG-Data: ' + eseFile)
        self.gngData = SctEseFormat(sctFile, eseFile, icao, requiredArrivalRoutes)