# importing the module
import sys


# this function will be the first to run as soon as the main function executes
def initial_phonebook():
    rows, cols = int(input("Please enter initial number of contacts: ")), 5

    # We are collecting the initial number of contacts the user wants to have in the
    # phonebook already. User may also enter 0 if he doesn't wish to enter any.
    phone_bookA = open("records.txt", 'a')
    phone_bookR = open("records.txt", 'r')
    print(phone_bookR.read())
    for i in range(rows):
        print("\nEnter contact %d details in the following order (ONLY):" % (i + 1))
        print("NOTE: * indicates mandatory fields")
        print("....................................................................")
        temp = []
        for j in range(cols):

            # We have taken the conditions for values of j only for the personalized fields
            # such as name, number, e-mail id, dob, category etc
            if j == 0:
                temp.append(str(input("Enter name*: ")))

                # We need to check if the user has left the name empty as its mentioned that
                # name & number are mandatory fields.
                # So implement a condition to check as below.
                if temp[j] == '' or temp[j] == ' ':
                    sys.exit(
                        "Name is a mandatory field. Process exiting due to blank field...")
                # This will exit the process if a blank field is encountered.

            if j == 1:
                temp.append(int(input("Enter number*: ")))
            # We do not need to check if user has entered the number because int automatically
            # takes care of it. Int value cannot accept a blank as that counts as a string.
            # So process automatically exits without us using the sys package.

            if j == 2:
                temp.append(str(input("Enter e-mail address: ")))
                # Even if this field is left as blank, None will take the blank's place
                if temp[j] == '' or temp[j] == ' ':
                    temp[j] = None

            if j == 3:
                temp.append(str(input("Enter date of birth(dd/mm/yy): ")))
                # Whatever format the user enters dob in, it won't make a difference to the compiler
                # Only while searching the user will have to enter query exactly the same way as
                # he entered during the input so as to ensure accurate searches
                if temp[j] == '' or temp[j] == ' ':
                    # Even if this field is left as blank, None will take the blank's place
                    temp[j] = None
            if j == 4:
                temp.append(
                    str(input("Enter category(Family/Friends/Work/Others): ")))
                # Even if this field is left as blank, None will take the blank's place
                if temp[j] == "" or temp[j] == ' ':
                    temp[j] = None

        for record in temp:
            phone_bookA.write(str(record) + ",")
        phone_bookA.write("\n")
    # By this step we are appending a list temp into a list phone_book
    # That means phone_book is a 2-D array and temp is a 1-D array

    print(phone_bookR.read())
    return phone_bookR.read()


def menu():
    # We created this simple menu function for
    # code reusability & also for an interactive console
    # Menu func will only execute when called
    print("********************************************************************")
    print("\t\t\tSMARTPHONE DIRECTORY", flush=False)
    print("********************************************************************")
    print("\tYou can now perform the following operations on this phonebook\n")
    print("1. Add a new contact")
    print("2. Remove an existing contact")
    print("3. Delete all contacts")
    print("4. Search for a contact")
    print("5. Display all contacts")
    print("6. Exit phonebook")

    # Out of the provided 6 choices, user needs to enter any 1 choice among the 6
    # We return the entered choice to the calling function wiz main in our case
    choice = int(input("Please enter your choice: "))

    return choice


def add_contact():
    # Adding a contact is the easiest because all you need to do is:
    # append another list of details into the already existing list
    dip = []
    for i in range(5):
        if i == 0:
            dip.append(str(input("Enter name: ")))
        if i == 1:
            dip.append(str(input("Enter number: ")))
        if i == 2:
            dip.append(str(input("Enter e-mail address: ")))
        if i == 3:
            dip.append(str(input("Enter date of birth(dd/mm/yy): ")))
        if i == 4:
            dip.append(
                str(input("Enter category(Family/Friends/Work/Others): ")))
    pb = open("records.txt", 'a')
    for record in dip:
        pb.write(record + ",")
    pb.write("\n")
    pb.close()


def remove_existing():
    pbr = open("records.txt", 'r')
    pbw = open("records.txt", 'w')

    # This function is to remove a contact's details from existing phonebook
    query = str(
        input("Please enter the name of the contact you wish to remove: "))
    # We'll collect name of the contact and search if it exists in our phonebook
    pb = []
    temp = 0
    # temp is a checking variable here. We assigned a value 0 to temp.

    for i in range(len(pb)):
        if query == pbr[i][0]:
            temp += 1
            # Temp will be incremented & it won't be 0 anymore in this function's scope

            print(pb.pop(i))
            # The pop function removes entry at index i

            print("This query has now been removed")
            # printing a confirmation message after removal.
            # This ensures that removal was successful.
            # After removal we will return the modified phonebook to the calling function
            # which is main in our program

            return pb
    if temp == 0:
        # Now if at all any case matches temp should've incremented but if otherwise,
        # temp will remain 0 and that means the query does not exist in this phonebook
        print("Sorry, you have entered an invalid query.\
	Please recheck and try again later.")

        return pb


def delete_all():
    # This function will simply delete all the entries in the phonebook pb
    # It will return an empty phonebook after clearing

    pb = open("records.txt", 'w')
    pb.write("")


def search_existing():
    # This function searches for an existing contact and displays the result
    choice = int(input("Enter search criteria\n\n\
	1. Name\n2. Number\n3. Email-id\n4. DOB\n5. Category(Family/Friends/Work/Others)\
	\nPlease enter: "))
    # We're doing so just to ensure that the user experiences a customized search result

    temp = []
    check = -1

    if choice == 1:
        # This will execute for searches based on contact name
        query = str(
            input("Please enter the name of the contact you wish to search: "))
        for i in range(len(pb)):
            if query == pb[i][0]:
                check = i
                temp.append(pb[i])

    elif choice == 2:
        # This will execute for searches based on contact number
        query = int(
            input("Please enter the number of the contact you wish to search: "))
        for i in range(len(pb)):
            if query == pb[i][1]:
                check = i
                temp.append(pb[i])

    elif choice == 3:
        # This will execute for searches based on contact's e-mail address
        query = str(input("Please enter the e-mail ID\
		of the contact you wish to search: "))
        for i in range(len(pb)):
            if query == pb[i][2]:
                check = i
                temp.append(pb[i])

    elif choice == 4:
        # This will execute for searches based on contact''s date of birth
        query = str(input("Please enter the DOB (in dd/mm/yyyy format ONLY)\
			of the contact you wish to search: "))
        for i in range(len(pb)):
            if query == pb[i][3]:
                check = i
                temp.append(pb[i])

    elif choice == 5:
        # This will execute for searches based on contact category
        query = str(
            input("Please enter the category of the contact you wish to search: "))
        for i in range(len(pb)):
            if query == pb[i][4]:
                check = i
                temp.append(pb[i])
    # All contacts under query category will be shown using this feature

    else:
        # If the user enters any other choice then the search will be unsuccessful
        print("Invalid search criteria")
        return -1
    # returning -1 indicates that the search was unsuccessful

    # all the searches are stored in temp and all the results will be displayed with
    # the help of display function

    if check == -1:
        return -1
    # returning -1 indicates that the query did not exist in the directory
    else:
        display_all(temp)
        return check
    # we're just returning a index value wiz not -1 to calling function just to notify
    # that the search worked successfully


# this function displays all content of phonebook pb
def display_all(pb):
    if not pb:
        # if display function is called after deleting all contacts then the len will be 0
        # And then without this condition it will throw an error
        print("List is empty: []")
    else:
        for i in range(len(pb)):
            print(pb[i])


def thanks():
    # A simple gesture of courtesy towards the user to enhance user experience
    print("********************************************************************")
    print("Thank you for using our Smartphone directory system.")
    print("Please visit again!")
    print("********************************************************************")
    sys.exit("Goodbye, have a nice day ahead!")


# Main function code
print("....................................................................")
print("Hello dear user, welcome to our smartphone directory system")
print("You may now proceed to explore this directory")
print("....................................................................")
# This is solely meant for decoration purpose only.
# You're free to modify your interface as per your will to make it look interactive

ch = 1
initial_phonebook()
while ch in (1, 2, 3, 4, 5):
    ch = menu()
    if ch == 1:
        add_contact()
    elif ch == 2:
        remove_existing()
    elif ch == 3:
        delete_all()
    elif ch == 4:
        d = search_existing()
        if d == -1:
            print("The contact does not exist. Please try again")
    elif ch == 5:
        display_all()
    else:
        thanks()