import pygame
import math
from scroller import scroller
from scroller import char_sheet

pygame.init()

# For this example, I just wanted to work with a small 320x240 space.
# Most of the old scrollers didn't have a lot of pixels to play with, after
# all.
size = width, height = 320, 240

black = 0, 0, 0
red = 255, 0, 0

# A character list to match up the available ASCII characters with the
# spritesheet. You could probably use ints instead. I used chars because I
# forgot Python treat chars like strings. x_X

characters = [' ', '!', '\"', '#', '$', '%',  '&', '\'', '(', ')', '*', '+',
              ',', '-', '.', '/', '0', '1', '2', '3', '4', '5', '6', '7', '8',
              '9', ':', ';', '<', '=', '>', '?', '@', 'A', 'B', 'C', 'D', 'E',
              'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
              'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
              '`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l',
              'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y',
              'z', '{', '|', '}', '~', '©']

# A CharSheet object holds the spritesheet and the character list, as well as
# the dimensions of each sprite.
char_sheet = char_sheet.CharSheet("jeromBD-metal-CCBY3.png",
                                  characters, 16, 16)

# Placeholder co-ordinates just to centre the scroller while I built this.
x = 320
y = 120

# We need a clock to restrain the framerate and not simply have the scroller
# zipping across before the view even realises the program has started.
clock = pygame.time.Clock()

# Creates a new Scroller object, with the text we want to put into it.
# Some space added to create a gap between repetitions.
scroller = scroller.Scroller("IT'S BEEN... one week since you looked at me, " +
                             "cocked your head to the side and said \"I'm " +
                             "angry\"                         ")

# Opens a pygame window to the previously-specified dimentions.
screen = pygame.display.set_mode(size)

while 1:

    # Obtain a time delta that will be used to determine the full extent of the
    # scroller's movement.
    dt = clock.tick(60)

    # Blank the screen first. Don't want any trails (At least not in this case.
    screen.fill(black)

    # Because for loops can't count themselves.
    i = 0

    # If a character is not present on the scroller, create one.
    # Else an exception will happen.
    if not scroller.sheet_chars:
        scroller.get_next_char(320, 120, 0.1, 2, 0, 20)

    for sheet_char in scroller.sheet_chars:
        # Move each character to the left.
        sheet_char.x -= sheet_char.x_speed * dt

        # Move the character up and down according to a sine wave.
        sheet_char.angle += sheet_char.y_speed
        sheet_char.y = ((sheet_char.radius *
                         math.sin(sheet_char.angle * math.pi / 180)) +
                        120)

        # Delete the character from memory if has left the visible screen.
        # i needs to be decreased too, as it has effectively stepped back one.
        if (sheet_char.x < -(char_sheet.char_width)):
            scroller.delete_first_char()
            i -= 1
        else:
            # If the newest character has fully entered the visible screen,
            # a new one can be introduced.
            if (i == (len(scroller.sheet_chars) - 1) and
               sheet_char.x <= (width - char_sheet.char_width)):
                scroller.get_next_char(320, 120, 0.1, 2, 0, 20)

                # This was just some debug stuff to figure out an issue.
                print(str(len(scroller.sheet_chars) - 1) + " | " + str(i) +
                      " | " + str(scroller.next_char))

            # All done, onto the next character, if there is one.
            i += 1

        # Create a rect that will serve as a bounding box into which the
        # character sprite will be drawn.
        sect = char_sheet.get_sheet(sheet_char)
        sprite = pygame.Rect((sect[0] * 16),
                             (sect[1] * 16), 16, 16)

        # Draw the character to the screen.
        screen.blit(char_sheet.sheet, (sheet_char.x,
                    sheet_char.y), sprite)

    # Bring the finished frame to the foreground.
    pygame.display.flip()