#Programmer: James Goudy
#Date: July 25, 2019

import urllib.request, json
import requests
import csv

"""
In order to run this program you need a api key.  You can acquire one for 
free at the website below.
https://www.nps.gov/subjects/digital/nps-data-api.htm
https://www.nps.gov/subjects/developer/api-documentation.htm
https://www.nps.gov/subjects/developer/get-started.htm

Helpful websites

https://www.nps.gov/subjects/developer/api-documentation.htm#/visitorcenters/getVisitorCenters
https://nps-vsp.warnercnr.colostate.edu/showallparkunits.php
https://github.com/nationalparkservice/nps-api-samples

https://www.nps.gov/subjects/developer/guides.htm#CP_JUMP_5617008
"""

def connect_to_nps(park):
    """ Connect to the National Park Service API"""
    
    # Configure API request - this is documented on the NPS site
    #Use the website to generate the url - put your parkcode and api
    #where appropriate
    
    park = park
    yourAPIkey = "ENTER YOU KEY HERE"
    endpoint = "https://developer.nps.gov/api/v1/visitorcenters?parkCode="+ park +"&stateCode=&fields=name&fields=description&api_key=" + yourAPIkey

    HEADERS = {"Authorization":yourAPIkey}
    req = urllib.request.Request(endpoint,headers=HEADERS)
    
    # Execute request and parse response
    response = urllib.request.urlopen(req).read()
    data = json.loads(response.decode('utf-8'))
    
    #---------------------------------------------------------------
    
    #print(data)
    #print(data["data"][0]["title"])
    
    #unpack 
    data1 = data["data"]
    
    return data1    

def displaydata(data,parkname):
    """ Display the data retreieved by the Natioan Park """
    label = parkname + " "
    
    print("\n------ " + label + "-------\n")
    
    # Check to see if there is a visitor center
    if not data:
        print("Location does not have a visitor center")
        return;
        
    for x in data:
        print(x.get('name'))
        print()
        print("Description - ",x.get('description'))
        print()
        print("Directions - ",x.get('directionsInfo'))
        print()
        print("Website - ",x.get('url'))
        print()
        print("\n---------------\n")
        
def csv_to_dict(file):
    """ Read CSV to object then turn it into a dictionary """
    newDict = {}
    
    #note that input file acts like a dictionary but it is not
    #it is an object that behaves like a dictionary
    input_file = csv.DictReader(open(file))

    #add items to the dictionary 
    for row in input_file:
        newDict.update({row['Abbreviation'] : row['ParkUnitName']})
    
    
    return newDict
    
def show_park_codes(parkdict):
    """ Show the national park codes """
    print("This is a listing of the Park Codes")
    print("PARK CODE\tNATIONAL PARK")
    print("---------       -------------")
    for key, value in parkdict.items():
        print(key + "\t\t" + value)

    
def main():
    
    #Read in park codes
    file = 'NPCodes.csv'
    NPCodeDict = csv_to_dict(file)

    
    answer = "yes"
    while (answer == "yes") or (answer == "y"):
        print("National Park Vistor Center Information")
        show = input('Show park codes? (y / n) ').lower()
        if (show == "yes") or (show == "y"):
            show_park_codes(NPCodeDict)
            
        print("Example Park Codes")
        print("Glacier - glac, Grand Teton - grte, Yellowstone - yell") 
        
        parkcode = input("Enter Park Code  ")
        parkcode = parkcode.lower()
        parkname = NPCodeDict.get(parkcode.upper(),"Not Found")
        
        thedata = connect_to_nps(parkcode)
        displaydata(thedata,parkname)
        
        answer = input("Would you like to continue? y / n  ")
    
main()