# using files and JSON in Python

# create a new text-file -> weekdays.txt

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

# NEW FILE

# open file and print the contents
file_handle = open("weekdays.txt", "r")
content = file_handle.read()
print(content)

# NEW FILE

# open file and read it line by line
file_handle = open("weekdays.txt", "r")

counter = 1

# as long as there are lines left, keep reading the line
while True:
    line = file_handle.readline()

    # last line, break out of loop
    if not line:
        break

    # print the line
    print(f"{counter}. {line}")
    counter = counter + 1

# NEW FILE

# open file and print the contents
file_handle = open("weekdays.txt", "r")
content = file_handle.read()

# split file content into a list!
lines = content.split("\n")

# how many lines in the file
amount = len(lines)

# go through each line of text
for index in range(amount):
    line = lines[index]
    print(f"{index + 1}. {line}")


# NEW FILE

# open file and print the contents
# "w" replaces all content in file
file_handle = open("testing.txt", "w", encoding="utf-8")

# ask a message from user
message = input("Write down your message:\n")

# write the message to a file
file_handle.write(message)

print("File saved!")

# NEW FILE

# open file and print the contents
# "a" adds the new data after the previous data in file
file_handle = open("testing.txt", "a", encoding="utf-8")

# ask a message from user
message = input("Write down your message:\n")

# add a newline after the mssage so it goes
# on another line in the file! otherwise
# everything is appended on same line
message = message + "\n"

# write the message to a file
file_handle.write(message)

# it's a good idea to close the file connection
# in order to prevent file lock in operating system, which
# often requires a restart of the computer
file_handle.close()

print("File saved!")

# create a new text file => city.json

{
   "name":"Rovaniemi",
   "population":62933,
   "county":"Lapland"
}

# NEW FILE

import json

# open file and print the contents
file_handle = open("city.json", "r")
content = file_handle.read()

data = json.loads(content)
print(data['name'])
print(data['population'])

# NEW FILE

import json

# our data, dictionary
phone = {
    "name": "Nokia 3310",
    "release_year": 2000,
    "battery": "1000mAh",
    "camera": False,
    "weight": 133
}

# open file in writing format
# note: append -mode doesn't work with JSON
# because it breaks the structure of JSON data!
file_handle = open("phone.json", "w")

# dictionary => JSON text
data = json.dumps(phone)

# save JSON text
file_handle.write(data)
file_handle.close()

print("Phone was saved.")

# create a new text file, cities.json

[
  {
    "name": "Los Angeles",
    "population": 3898747,
    "state": "California"
  },
  {
    "name": "Miami",
    "population": 6166488,
    "state": "Florida"
  },
  {
    "name": "Denver",
    "population": 715522,
    "state": "Colorado"
  }
]

# NEW FILE

import json

# load the json file contents
file_handle = open("cities.json", "r")
content = file_handle.read()

# convert JSON string => Python list of dictionaries
data = json.loads(content)

# loop through all data (cities)
for city in data:
    print(city['name'])
    print(city['population'])
    print()


# BIG EXAMPLE, THIS READS A JSON FILE LIST AND ADDS NEW DATA INTO IT

import json

# load the json file contents
file_handle = open("cities.json", "r")
content = file_handle.read()
file_handle.close()

# convert JSON string => Python list of dictionaries
data = json.loads(content)

# loop through all data (cities)
for city in data:
    print(city['name'])
    print(city['state'])
    print(city['population'])
    print()

print()

# let's add a new city, ask the info from user:
city_name = input("New city, name:\n")
city_population = input("New city, population:\n")
city_state = input("New city, state:\n")

# create a new dictionary
new_city = {
    "name": city_name,
    "population": int(city_population),
    "state": city_state
}

# add new dictionary into existing list of cities
data.append(new_city)

# convert list of dictionaries => JSON text
json_data = json.dumps(data)

# open file for writing and write JSON text into file
file_handle = open("cities.json", "w")
file_handle.write(json_data)

# close connection
file_handle.close()

# inform the user
print("New city saved successfully!")