import pygame, sys

#General setup
pygame.init()
clock = pygame.time.Clock()

#Display Surfaces / variables
screen = pygame.display.set_mode((800,800))
base_font = pygame.font.Font(None,32)
user_text = ''
input_rect = pygame.Rect(200,200,140,32)
colour_active = pygame.Color('aqua')
colour_passive = pygame.Color('aquamarine4')
colour = colour_passive

active = False

#Loop that is always true 
while True:

    for event in pygame.event.get():
        #Closing the game
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()     

        if event.type == pygame.MOUSEBUTTONDOWN:
            if input_rect.collidepoint(event.pos):
                active = True
            else: 
                active = False

        #User input
        if event.type == pygame.KEYDOWN:
            if active == True:
                if event.key == pygame.K_BACKSPACE:
                    user_text = user_text[:-1]
                else:
                    user_text += event.unicode         

    #Changing colour of textboxes/text
    if active:
        colour = colour_active
    else:
        colour = colour_passive


    #Drawing (making code into visable image)
    screen.fill((0,0,0))  
    text_surface = base_font.render(user_text,True,(255,255,255))
    screen.blit(text_surface,(input_rect.x+ 5,input_rect.y + 5))
    pygame.draw.rect(screen,colour,input_rect,2)
    #Containing text into text box
    input_rect.w = max(100,text_surface.get_width() + 10)

    #Misc/framerate 
    pygame.display.flip()   
    clock.tick(60)