def writeToFile():
    with open("passengers.txt", "a") as file:
        c = 'y'
        while c == 'y':
            id=input("enter your ID : ")
            name=input("enter your Name : ")
            age=input("enter your Age : ")
            destination=input("enter your Destination : ")
            file.write(id + '\t' + name + '\t' + age + '\t' + destination + '\n')
            c = input("Do you want to enter a new record ( y / n) ? ")
        print("record added successfully")

def readFromFile():
    print("ID\tName\tAge\tDestination")
    print("----------------------------")
    with open("passengers.txt", "r") as file:
        #print(file.read())
        for line in file:
            print(line,end="")
        #print("\n")

def SearchById():
    id = input("enter Id to search : ")
    flag = False
    with open("passengers.txt", "r") as file:
        for line in file:
            l  = line.split('\t')
            if l[0]==id:
                flag=True
                print("ID\tName\tAge\tDestination")
                print("----------------------------")
                print(line)
                return
    if not flag:
        print("record not found")

def deleteRecord():
    import os
    id = input("enter Id to delete : ")
    file = open("passengers.txt", "r")
    tempfile = open("tmp.txt", "w")
    flag = False
    for line in file:
        l=line.split('\t')
        if id==l[0]:
            flag = True
        else:
            tempfile.write(line)
    file.close()
    tempfile.close()
    os.remove("passengers.txt")
    os.rename("tmp.txt", "passengers.txt")
    if not flag:
        print("record does not exist")
    else:
        print("the record deleted successfully")

def updateRecord():
    import os
    id = input("enter Id you want to update : ")
    field = input("Which field do you want to update \n1 - ID\n2 - Name\n3 - Age\n4 - Destination\nYour choice :  ")
    file = open("passengers.txt", "r")
    tempfile = open("tmp.txt", "w")
    flag = False
    for line in file:
        l = line.split('\t')
        if id != l[0]:
            tempfile.write(line)
        else:
            flag = True
            if field == "1":
                new_id = input("enter new ID : ")
                tempfile.write(new_id + '\t' + l[1] + '\t' + l[2] + '\t' + l[3])
            elif field == "2":
                new_name = input("enter new Name : ")
                tempfile.write(l[0] + '\t' + new_name + '\t' + l[2] + '\t' + l[3])
            elif field == "3":
                new_age = input("enter new Age : ")
                tempfile.write(l[0] + '\t' + l[1] + '\t' + new_age + '\t' + l[3])
            elif field == "4":
                new_dest = input("enter new Destination : ")
                tempfile.write(l[0] + '\t' + l[1] + '\t' + l[2] + '\t' + new_dest)
    file.close()
    tempfile.close()
    os.remove("passengers.txt")
    os.rename("tmp.txt", "passengers.txt")
    if not flag:
        print("record does not exist")
    else:
        print("record updated successfully")

def main():
    while True:
            print("\n------------BUS RESERVATION SYSTEM---------------")
            print("(Choose one of these to do)")
            print("1 - Enter new passenger")
            print("2 - View all passengers")
            print("3 - Search for a passenger")
            print("4 - Change passenger information")
            print("5 - Delete a passenger")
            print("6 - Exit")
            ch = int(input("Your choice : "))
            if ch == 1:
                writeToFile()
            elif ch == 2:
                readFromFile()
            elif ch == 3:
                SearchById()
            elif ch == 4:
                updateRecord()
            elif ch == 5:
                deleteRecord()
            elif ch == 6:
                print("\n Thanks for using our System , we hope you like it :)")
                break
            else:
                print("\n please choose one of the shown choices\n")

main()


# def updateRecord():
#     import os
#     id = input("enter Id you want to update : ")
#     file = open("passengers.txt", "r")
#     tempfile = open("tmp.txt", "w")
#     flag = False
#     for line in file:
#         l = line.split('\t')
#         if id != l[0]:
#             tempfile.write(line)
#         else:
#             flag = True
#             age = input("enter new age : ")
#             tempfile.write()
#     file.close()
#     tempfile.close()
#     os.remove("passengers.txt")
#     os.rename("tmp.txt", "passengers.txt")
#     if not flag:
#         print("record does not exist")
#     else:
#         print("record updated successfully")

# def updateRecord_v2():
#     import os
#     id = input("enter Id you want to update : ")
#     field = input("Which field do you want to update (ID, Name, Age, Destination)? ")
#     file = open("passengers.txt", "r")
#     tempfile = open("tmp.txt", "w")
#     flag = False
#     for line in file:
#         l = line.split('\t')
#         if id == l[0]:
#             flag = True
#              if field == "name"
#             tempfile.write(line)
#         else:
#             flag = True
#             age = input("enter new age : ")
#             tempfile.write()
#     file.close()
#     tempfile.close()
#     os.remove("passengers.txt")
#     os.rename("tmp.txt", "passengers.txt")
#     if not flag:
#         print("record does not exist")
#     else:
#         print("record updated successfully")

# readFromFile()
# writeToFile()
# writeToFile()
# # updateRecord()
# readFromFile()
# SearchById()
# deleteRecord()
# readFromFile()