import badger2040
import machine
import time
import sys

# Global Constants
WIDTH = badger2040.WIDTH
HEIGHT = badger2040.HEIGHT

IMAGE_WIDTH = 110

COMPANY_HEIGHT = 30
DETAILS_HEIGHT = 20
NAME_HEIGHT = HEIGHT - COMPANY_HEIGHT - (DETAILS_HEIGHT * 2) - 2
TEXT_WIDTH = WIDTH - IMAGE_WIDTH - 1

COMPANY_TEXT_SIZE = 0.6
DETAILS_TEXT_SIZE = 0.5

LEFT_PADDING = 5
NAME_PADDING = 20
DETAIL_SPACING = 10

OVERLAY_BORDER = 40
OVERLAY_SPACING = 20
OVERLAY_TEXT_SIZE = 0.6


# ------------------------------
#      Utility functions
# ------------------------------

# Reduce the size of a string until it fits within a given width
def truncatestring(text, text_size, width):
    while True:
        length = display.measure_text(text, text_size)
        if length > 0 and length > width:
            text = text[:-1]
        else:
            text += ""
            return text


# ------------------------------
#      Drawing functions
# ------------------------------

# Draw an overlay box with a given message within it
def draw_overlay(message, width, height, line_spacing, text_size):

    # Draw a light grey background
    display.pen(12)
    display.rectangle((WIDTH - width) // 2, (HEIGHT - height) // 2, width, height)

    # Take the provided message and split it up into
    # lines that fit within the specified width
    words = message.split(" ")
    lines = []
    line = ""
    appended_line = ""
    for word in words:
        if len(word) > 0:
            appended_line += " "
        appended_line += word
        if display.measure_text(appended_line, text_size) >= width:
            lines.append(line)
            appended_line = word
        else:
            line = appended_line
    if len(line) != 0:
        lines.append(line)

    display.pen(0)
    display.thickness(2)

    # Display each line of text from the message, centre-aligned
    num_lines = len(lines)
    for i in range(num_lines):
        length = display.measure_text(lines[i], text_size)
        current_line = (i * line_spacing) - ((num_lines - 1) * line_spacing) // 2
        display.text(lines[i], (WIDTH - length) // 2, (HEIGHT // 2) + current_line, text_size)


# Draw the badge, including user text
def draw_badge():
    display.pen(0)
    display.clear()

    # Replace with drawing an image
    display.pen(15)
    display.rectangle(WIDTH - IMAGE_WIDTH, 0, IMAGE_WIDTH, HEIGHT)

    # Draw a border around the image
    display.pen(0)
    display.thickness(1)
    display.line(WIDTH - IMAGE_WIDTH, 0, WIDTH - 1, 0)
    display.line(WIDTH - IMAGE_WIDTH, 0, WIDTH - IMAGE_WIDTH, HEIGHT - 1)
    display.line(WIDTH - IMAGE_WIDTH, HEIGHT - 1, WIDTH - 1, HEIGHT - 1)
    display.line(WIDTH - 1, 0, WIDTH - 1, HEIGHT - 1)

    # Uncomment this if a white background is wanted behind the company
    # display.pen(15)
    # display.rectangle(1, 1, TEXT_WIDTH, COMPANY_HEIGHT - 1)

    # Draw the company
    display.pen(15)  # Change this to 0 if a white background is used
    display.font("serif")
    display.thickness(3)
    display.text(company, LEFT_PADDING, (COMPANY_HEIGHT // 2) + 1, COMPANY_TEXT_SIZE)

    # Draw a white background behind the name
    display.pen(15)
    display.thickness(1)
    display.rectangle(1, COMPANY_HEIGHT + 1, TEXT_WIDTH, NAME_HEIGHT)

    # Draw the name, scaling it based on the available width
    display.pen(0)
    display.font("sans")
    display.thickness(4)
    name_size = 2.0  # A sensible starting scale
    while True:
        name_length = display.measure_text(name, name_size)
        if name_length >= (TEXT_WIDTH - NAME_PADDING) and name_size >= 0.1:
            name_size -= 0.01
        else:
            display.text(name, (TEXT_WIDTH - name_length) // 2, (NAME_HEIGHT // 2) + COMPANY_HEIGHT + 1, name_size)
            break

    # Draw a white backgrounds behind the details
    display.pen(15)
    display.thickness(1)
    display.rectangle(1, HEIGHT - DETAILS_HEIGHT * 2, TEXT_WIDTH, DETAILS_HEIGHT - 1)
    display.rectangle(1, HEIGHT - DETAILS_HEIGHT, TEXT_WIDTH, DETAILS_HEIGHT - 1)

    # Draw the first detail's title and text
    display.pen(0)
    display.font("sans")
    display.thickness(3)
    name_length = display.measure_text(detail1_title, DETAILS_TEXT_SIZE)
    display.text(detail1_title, LEFT_PADDING, HEIGHT - ((DETAILS_HEIGHT * 3) // 2), DETAILS_TEXT_SIZE)
    display.thickness(2)
    display.text(detail1_text, 5 + name_length + DETAIL_SPACING, HEIGHT - ((DETAILS_HEIGHT * 3) // 2), DETAILS_TEXT_SIZE)

    # Draw the second detail's title and text
    display.thickness(3)
    name_length = display.measure_text(detail2_title, DETAILS_TEXT_SIZE)
    display.text(detail2_title, LEFT_PADDING, HEIGHT - (DETAILS_HEIGHT // 2), DETAILS_TEXT_SIZE)
    display.thickness(2)
    display.text(detail2_text, LEFT_PADDING + name_length + DETAIL_SPACING, HEIGHT - (DETAILS_HEIGHT // 2), DETAILS_TEXT_SIZE)


# ------------------------------
#        Program setup
# ------------------------------

# Global variables
show_overlay = False

# Create a new Badger and set it to update NORMAL
display = badger2040.Badger2040()
display.update_speed(badger2040.UPDATE_NORMAL)

try:
    open("badge.txt", "r")
except OSError:
    display.pen(15)
    display.clear()
    draw_overlay("To run this Badge demo, make sure there is a badge.txt file on your MicroPython device.", WIDTH - OVERLAY_BORDER, HEIGHT - OVERLAY_BORDER, OVERLAY_SPACING, OVERLAY_TEXT_SIZE)
    display.update()
    sys.exit()

# Open the badge file
badge = open("badge.txt", "r")

# Read in the next 6 lines
company = badge.readline()        # "mustelid inc"
name = badge.readline()           # "H. Badger"
detail1_title = badge.readline()  # "RP2040"
detail1_text = badge.readline()   # "2MB Flash"
detail2_title = badge.readline()  # "E ink"
detail2_text = badge.readline()   # "296x128px"

# Truncate all of the text (except for the name as that is scaled)
company = truncatestring(company, COMPANY_TEXT_SIZE, TEXT_WIDTH)

detail1_title = truncatestring(detail1_title, DETAILS_TEXT_SIZE, TEXT_WIDTH)
detail1_text = truncatestring(detail1_text, DETAILS_TEXT_SIZE,
                              TEXT_WIDTH - DETAIL_SPACING - display.measure_text(detail1_title, DETAILS_TEXT_SIZE))

detail2_title = truncatestring(detail2_title, DETAILS_TEXT_SIZE, TEXT_WIDTH)
detail2_text = truncatestring(detail2_text, DETAILS_TEXT_SIZE,
                              TEXT_WIDTH - DETAIL_SPACING - display.measure_text(detail2_title, DETAILS_TEXT_SIZE))

# Set up the buttons
button_a = machine.Pin(badger2040.BUTTON_A, machine.Pin.IN, machine.Pin.PULL_DOWN)
button_b = machine.Pin(badger2040.BUTTON_B, machine.Pin.IN, machine.Pin.PULL_DOWN)
button_c = machine.Pin(badger2040.BUTTON_C, machine.Pin.IN, machine.Pin.PULL_DOWN)
button_up = machine.Pin(badger2040.BUTTON_UP, machine.Pin.IN, machine.Pin.PULL_DOWN)
button_down = machine.Pin(badger2040.BUTTON_DOWN, machine.Pin.IN, machine.Pin.PULL_DOWN)


# Button handling function
def button(pin):
    global show_overlay

    if pin == button_a:
        show_overlay = True
        return

    if pin == button_b:
        show_overlay = True
        return

    if pin == button_c:
        show_overlay = True
        return

    if pin == button_up:
        show_overlay = True
        return

    if pin == button_down:
        show_overlay = True
        return


# Register the button handling function with the buttons
button_a.irq(trigger=machine.Pin.IRQ_RISING, handler=button)
button_b.irq(trigger=machine.Pin.IRQ_RISING, handler=button)
button_c.irq(trigger=machine.Pin.IRQ_RISING, handler=button)
button_up.irq(trigger=machine.Pin.IRQ_RISING, handler=button)
button_down.irq(trigger=machine.Pin.IRQ_RISING, handler=button)


# ------------------------------
#       Main program loop
# ------------------------------

draw_badge()
display.update()

while True:
    if show_overlay:
        draw_overlay("To change the text, connect Badger2040 to a PC, load up Thonny, and modify badge.txt",
                     WIDTH - OVERLAY_BORDER, HEIGHT - OVERLAY_BORDER, OVERLAY_SPACING, OVERLAY_TEXT_SIZE)
        display.update()
        time.sleep(4)

        draw_badge()
        display.update()
        show_overlay = False

    time.sleep(0.1)