# lecture 30.11.2022, file management in Python
print("Welcome!")

# NEW TEXT FILE - weekdays.txt

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

# NEW FILE

# open a connection to our file
file_handle = open("weekdays.txt", "r")

# read all contents to a variable and print
content = file_handle.read()
print(content)

# always remember to close the connection in the end
# to avoid strange file locking bugs
file_handle.close()

# NEW FILE

# open a connection to our file
file_handle = open("weekdays.txt", "r")

counter = 1

while True:
    # keep on getting a single line from file
    # as the are lines still left
    line = file_handle.readline()
    print(f"{counter}. {line}")

    counter = counter + 1

    # no more lines left in file => break
    if not line:
        break

# always remember to close the connection in the end
# to avoid strange file locking bugs
file_handle.close()
# NEW FILE

# open a connection to our file
file_handle = open("weekdays.txt", "r")

# read all contents to a variable and print
content = file_handle.read()
lines = content.split("\n")

# because lines is just a Python list, we can use loops
for line in lines:
    print(line)

print()

# or we can do a numbered just like before with products
amount = len(lines)

for index in range(amount):
    line = lines[index]
    print(f"{index + 1}. {line}")


# always remember to close the connection in the end
# to avoid strange file locking bugs
file_handle.close()

# NEW FILE

# open file for writing
file_handle = open("memo.txt", "w", encoding="utf-8")

# ask user for text, write it to file
text = input("Give some text:\n")
file_handle.write(text)

# always remember to close the connection in the end
# to avoid strange file locking bugs
file_handle.close()

# NEW FILE

# open file for writing, use append instead of "w"
file_handle = open("memo.txt", "a", encoding="utf-8")

# ask user for text, write it to file
text = input("Give some text:\n")

# remember add new lines if you don't want
# to append text on the same line
file_handle.write(text + "\n\n")

# always remember to close the connection in the end
# to avoid strange file locking bugs
file_handle.close()

# NEW JSON FILE -> app_data.json

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

# NEW FILE

import json
import var_dump as vd

# get the JSON data from the file
file_handle = open("app_data.json", "r")
content = file_handle.read()
file_handle.close()

# convert JSON data (which is text) into Python data
city = json.loads(content)

# city is just a Python dictionary
print(city['name'])
print(city['county'])

# compare the vardumps
# vd.var_dump(content)
# print()
# vd.var_dump(city)

# NEW FILE

import json

# create a dictionary, for example, a phone
phone = {
    "name": "Nokia 3310",
    "release_year": 2000,
    "battery": "1000mAh",
    "camera": False,
    "weight": 133
}

# if you want to save JSON in prettier format
# try adding parameter indent = 4
content = json.dumps(phone)

# open file for writing, write the JSON text
# inside the file
file_handle = open("phone.json", "w")
file_handle.write(content)
file_handle.close()

print("Phone saved successfully!")

# NEW JSON -file : cities.json

[
  {
    "name": "Finland",
    "population": 5536146,
    "capital": "Helsinki"
  },
  {
    "name": "Sweden",
    "population": 10402070,
    "capital": "Stockholm"
  },
  {
    "name": "France",
    "population": 67413000,
    "capital": "Paris"
  }
]

# NEW FILE

import json

file_handle = open("cities.json", "r")
content = file_handle.read()
file_handle.close()

# convert JSON to Python data
cities = json.loads(content)

# cities is is a list of dictionaries, so we can loop it:
for city in cities:
    print(city['name'])
    print(city['capital'])
    print()

# NEW JSON-file: americancities.json

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

# NEW FILE

import json

file_handle = open("americancities.json", "r")
content = file_handle.read()
file_handle.close()

# convert JSON to Python data
cities = json.loads(content)

for city in cities:
    print(city['name'])
    print(city['state'])
    print(city['population'])
    print()

# PHASE 2: add new city into data

new_city_name = input("New city, name:\n")
new_city_state = input("New city, state:\n")
new_city_population = input("New city, population:\n")
new_city_population = int(new_city_population)

# build a new dictionary based on data given by user
new_city = {
    "name": new_city_name,
    "population": new_city_population,
    "state": new_city_state
}

cities.append(new_city)

# save the new version of the cities-list back to JSON

# for prettier JSON format, add parameter indent=4
json_data = json.dumps(cities)

file_handle = open("americancities.json", "w")
file_handle.write(json_data)
file_handle.close()

print("New city saved!")