#!/usr/bin/env python

import argparse
import configparser
import os
import urllib.request
from bs4 import BeautifulSoup
from aman.types.PerformanceData import PerformanceData

def findAircraftPages(rooturl : str, suburl : str):
    aircrafts = []

    with urllib.request.urlopen(rooturl + suburl) as site:
        data = site.read().decode('utf-8')
        site.close()

        parsed = BeautifulSoup(data, features='lxml')

        for link in parsed.body.find_all('a', title=True):
            split = link['href'].split('/')
            if 3 == len(split) and split[2] == link['title'] and 'Category' not in link['title'] and 'Special' not in link['href']:
                aircrafts.append(rooturl + link['href'])

        for link in parsed.body.find_all('a', attrs={ 'title': 'Category:Aircraft' }):
            if 'previous' not in link.text:
                aircrafts.extend(findAircraftPages(rooturl, link['href']))

    return aircrafts

def findAndParseEntry(tableRow, startIdx, substring, default):
    while 0 < startIdx:
        if substring in tableRow[startIdx].text:
            split = tableRow[startIdx].text.split(' ')
            if 1 >= len(split):
                return default, startIdx - 2
            else:
                return int(split[0]), startIdx - 2
        else:
            startIdx -= 1

    return 0, -1

def findAndParseSpeedEntry(tableRow, startIdx, default):
    return findAndParseEntry(tableRow, startIdx, 'kts', default)

def findAndParseRodEntry(tableRow, startIdx, default):
    return findAndParseEntry(tableRow, startIdx, 'ft/min', default)

def parsePerformanceEntries(tableRowSpeeds, tableRowRODs):
    speeds = []
    rods = []

    # parse the speed data
    idx = len(tableRowSpeeds) - 1
    while 0 < idx:
        parsed = findAndParseSpeedEntry(tableRowSpeeds, idx, 140 if 0 == len(speeds) else 250)
        if 0 < idx:
            speeds.append(parsed[0])
            idx = parsed[1]

    # parse the ROD data
    idx = len(tableRowRODs) - 1
    while 0 < idx:
        parsed = findAndParseRodEntry(tableRowRODs, idx, 2000)
        if 0 < idx:
            rods.append(parsed[0])
            idx = parsed[1]

    return speeds, rods

def parsePerformanceData(url : str):
    with urllib.request.urlopen(url) as site:
        data = site.read().decode('utf-8')
        site.close()

        # check if we find the ICAO code
        parsed = BeautifulSoup(data, features='lxml')
        icao = parsed.body.find('h5', attrs={ 'id' : 'siteSub', 'class' : 'subtitle'})
        if None == icao or '' == icao.text:
            return False, None

        aircraft = PerformanceData(icao.text)
        performanceTable = parsed.body.find('table', attrs={ 'class' : 'wikitable', 'style' : 'font-size: 90%;' })
        if None == performanceTable or None == performanceTable.find_all('tr')[1] or None == performanceTable.find_all('tr')[2]:
            return False, None

        speeds, rods = parsePerformanceEntries(performanceTable.find_all('tr')[1].find_all('td'),
                                               performanceTable.find_all('tr')[2].find_all('td'))
        if 10 > len(speeds):
            speeds.insert(1, speeds[1])

        # create the speed data
        if len(speeds) >= 4:
            aircraft.speedApproach = speeds[0]
            aircraft.speedBelowFL100 = speeds[1]
            aircraft.speedAboveFL100 = speeds[2]
            aircraft.speedAboveFL240 = speeds[3]
        # create the ROD data
        if len(rods) >= 3:
            aircraft.rodBelowFL100 = rods[0]
            aircraft.rodAboveFL100 = rods[1]
            aircraft.rodAboveFL240 = rods[2]

        return len(speeds) >= 4 and len(rods) >= 3, aircraft

if __name__ == '__main__':
    # create the commandline parser
    parser = argparse.ArgumentParser(description='Extract the aircraft performace data')
    parser.add_argument('directory', help='Directory where to store the performance data configuration')
    args = parser.parse_args()

    # create the directory if it does not exist
    if not os.path.exists(args.directory):
        os.makedirs(args.directory)

    # parse the aircrafts
    links = findAircraftPages('https://www.skybrary.aero', '/index.php?title=Category:Aircraft')
    print('Found ' + str(len(links)) + ' aircrafts')

    aircrafts = []
    for link in links:
        valid, aircraft = parsePerformanceData(link)

        if False == valid:
            print('Unable to find performance data for ' + link)
            continue

        aircrafts.append(aircraft)

    print('Successfully parsed ' + str(len(aircrafts)) + ' of ' + str(len(links)) + ' aircrafts')

    # create the configuration file
    config = configparser.ConfigParser()
    for aircraft in aircrafts:
        config[aircraft.icao] = {
            'speedAboveFL240' : aircraft.speedAboveFL240,
            'rodAboveFL240' : aircraft.rodAboveFL240,
            'speedAboveFL100' : aircraft.speedAboveFL100,
            'rodAboveFL100' : aircraft.rodAboveFL100,
            'speedBelowFL100' : aircraft.speedBelowFL100,
            'rodBelowFL100' : aircraft.rodBelowFL100,
            'speedApproach' : aircraft.speedApproach
        }

    # write the configuration data
    with open(args.directory + '/PerformanceData.ini', 'w') as file:
        config.write(file)