#!/usr/bin/python
import threading
import time
import datetime
from Adafruit_LEDBackpack import LEDBackpack

# ===========================================================================
# Alphanumeric Display
# ===========================================================================

# This class is meant to be used with the 4-character alphanumeric
# displays available from Adafruit

class Alphanumeric(object):
    disp = None
 
    # Hexadecimal character lookup table
    lut = [
        0b0000000000000001,
        0b0000000000000010,
        0b0000000000000100,
        0b0000000000001000,
        0b0000000000010000,
        0b0000000000100000,
        0b0000000001000000,
        0b0000000010000000,
        0b0000000100000000,
        0b0000001000000000,
        0b0000010000000000,
        0b0000100000000000,
        0b0001000000000000,
        0b0010000000000000,
        0b0100000000000000,
        0b1000000000000000,
        0b0000000000000000,
        0b0000000000000000,
        0b0000000000000000,
        0b0000000000000000,
        0b0000000000000000,
        0b0000000000000000,
        0b0000000000000000,
        0b0000000000000000,
        0b0001001011001001,
        0b0001010111000000,
        0b0001001011111001,
        0b0000000011100011,
        0b0000010100110000,
        0b0001001011001000,
        0b0011101000000000,
        0b0001011100000000,
        0b0000000000000000, #
        0b0000000000000110, # !
        0b0000001000100000, # "
        0b0001001011001110, # #
        0b0001001011101101, # $
        0b0000110000100100, # %
        0b0010001101011101, # &
        0b0000010000000000, # '
        0b0010010000000000, # (
        0b0000100100000000, # )
        0b0011111111000000, # *
        0b0001001011000000, # +
        0b0000100000000000, # ,
        0b0000000011000000, # -
        0b0000000000000000, # .
        0b0000110000000000, # /
        0b0000110000111111, # 0
        0b0000000000000110, # 1
        0b0000000011011011, # 2
        0b0000000010001111, # 3
        0b0000000011100110, # 4
        0b0010000001101001, # 5
        0b0000000011111101, # 6
        0b0000000000000111, # 7
        0b0000000011111111, # 8
        0b0000000011101111, # 9
        0b0001001000000000, # :
        0b0000101000000000, # ;
        0b0010010000000000, # <
        0b0000000011001000, # =
        0b0000100100000000, # >
        0b0001000010000011, # ?
        0b0000001010111011, # @
        0b0000000011110111, # A
        0b0001001010001111, # B
        0b0000000000111001, # C
        0b0001001000001111, # D
        0b0000000011111001, # E
        0b0000000001110001, # F
        0b0000000010111101, # G
        0b0000000011110110, # H
        0b0001001000000000, # I
        0b0000000000011110, # J
        0b0010010001110000, # K
        0b0000000000111000, # L
        0b0000010100110110, # M
        0b0010000100110110, # N
        0b0000000000111111, # O
        0b0000000011110011, # P
        0b0010000000111111, # Q
        0b0010000011110011, # R
        0b0000000011101101, # S
        0b0001001000000001, # T
        0b0000000000111110, # U
        0b0000110000110000, # V
        0b0010100000110110, # W
        0b0010110100000000, # X
        0b0001010100000000, # Y
        0b0000110000001001, # Z
        0b0000000000111001, # [
        0b0010000100000000, #
        0b0000000000001111, # ]
        0b0000110000000011, # ^
        0b0000000000001000, # _
        0b0000000100000000, # `
        0b0001000001011000, # a
        0b0010000001111000, # b
        0b0000000011011000, # c
        0b0000100010001110, # d
        0b0000100001011000, # e
        0b0000000001110001, # f
        0b0000010010001110, # g
        0b0001000001110000, # h
        0b0001000000000000, # i
        0b0000000000001110, # j
        0b0011011000000000, # k
        0b0000000000110000, # l
        0b0001000011010100, # m
        0b0001000001010000, # n
        0b0000000011011100, # o
        0b0000000101110000, # p
        0b0000010010000110, # q
        0b0000000001010000, # r
        0b0010000010001000, # s
        0b0000000001111000, # t
        0b0000000000011100, # u
        0b0010000000000100, # v
        0b0010100000010100, # w
        0b0010100011000000, # x
        0b0010000000001100, # y
        0b0000100001001000, # z
        0b0000100101001001, # {
        0b0001001000000000, # |
        0b0010010010001001, # }
        0b0000010100100000, # ~
        0b0011111111111111]
                
    special = dict(degree= 0b0000000011100011, cone=0b0010100000001000)
    
    def __init__(self, address=0x70, debug=False):
        self.disp = LEDBackpack(address=address, debug=debug)

    def writeCharRaw(self, charNumber, value):
        "Sets a digit using the raw 16-bit value"
        if (charNumber > 4):
            return
        # Set the appropriate digit
        self.disp.setBufferRow(charNumber, value)

    def writeChar(self, charNumber, value, dot=False):
        "Sets a single decimal or hexademical value (0..9 and A..F)"
        if (charNumber > 4):
            return
        if value in self.special:
            value = self.special[value]
        else:
            value = self.lut[ord(value)]
        # Set the appropriate digit
        self.disp.setBufferRow(charNumber, value | (dot << 14))

class AlphaScroller(threading.Thread):
    def __init__(self, address=0x70, interval=.25):
        self.interval = interval
        self.disp = Alphanumeric(address)
        self.text = [(' ',)]*4
        self.counter = 0

        super(AlphaScroller, self).__init__()
        self.running = True

    def stop(self):
        self.running = False
    
    def set_text(self, text, pad=True, reset=True):
        i = 0
        self.text = []
        while i < len(text):
            if i+1 < len(text) and text[i+1] == ".":
                self.text.append((text[i], True))
                i+= 1
            else:
                self.text.append((text[i],))
            i+= 1

        if pad:
            self.text += [(' ',)]*4

        if reset:
            self.counter = 0
    
    def set_speed(self, interval):
        self.interval = interval
    
    def run(self):
        while self.running:
            for i in range(4):
                if len(self.text) < 4:
                    char = self.text[i] if i < len(self.text) else (' ',)
                else:
                    char = self.text[(self.counter+i) % len(self.text)]
                if len(char[0]) == 0:
                    print self.text
                self.disp.writeChar(i, *char)
            time.sleep(self.interval)
            self.counter += 1
        for i in range(4):
            self.disp.writeChar(i, ' ')

if __name__ == "__main__":
    scroller = AlphaScroller(interval=.4)
    scroller.set_text(list("Hello. World.")+["cone","degree"])
    scroller.start()
    try:
        while scroller.isAlive():
            scroller.join(1)
    except KeyboardInterrupt:
        scroller.stop()