#!/usr/bin/env python

from ctypes import CDLL, POINTER, c_void_p, Structure, c_uint8, c_size_t, cast, addressof
import numpy as np
from itertools import product
from matelight import sendframe, DISPLAY_WIDTH, DISPLAY_HEIGHT
from terminal import printframe

class COLOR(Structure):
        _fields_ = [('r', c_uint8), ('g', c_uint8), ('b', c_uint8), ('a', c_uint8)]

class FRAMEBUFFER(Structure):
        _fields_ = [('data', POINTER(COLOR)), ('w', c_size_t), ('h', c_size_t)]

bdf = CDLL('./libbdf.so')
bdf.read_bdf_file.restype = c_void_p
bdf.framebuffer_render_text.restype = POINTER(FRAMEBUFFER)

unifont = bdf.read_bdf_file('unifont.bdf')

def render_text(text):
    assert unifont
    fb = bdf.framebuffer_render_text(bytes(str(text), 'UTF-8'), unifont)
    fbd = fb.contents
    buf = np.ctypeslib.as_array(cast(fbd.data, POINTER(c_uint8)), shape=(fbd.h, fbd.w, 4))
    # Set data pointer to NULL before freeing framebuffer struct to prevent free_framebuffer from also freeing the data
    # buffer that is now used by numpy
    #bdf.console_render_buffer(fb)
    fbd.data = cast(c_void_p(), POINTER(COLOR))
    bdf.free_framebuffer(fb)
    return buf

def printframe(fb):
    h,w,_ = fb.shape
    print('\033[H\033[2J')
    bdf.console_render_buffer(fb.ctypes.data_as(POINTER(c_uint8)), w, h)

if __name__ == '__main__':
    fb = render_text('\033[31;48;5;167;4;6mfoo\033[0;91mbar\033[93;106;5mbaz\033[0m\033[0;94;6m♥♥♥');
    h,w,_ = fb.shape
    for i in range(-DISPLAY_WIDTH,w+1):
        leftpad     = np.zeros((DISPLAY_HEIGHT, max(-i, 0), 4), dtype=np.uint8)
        framedata   = fb[:, max(0, i):min(i+DISPLAY_WIDTH, w)]
        rightpad    = np.zeros((DISPLAY_HEIGHT, min(DISPLAY_WIDTH, max(0, i+DISPLAY_WIDTH-w)), 4), dtype=np.uint8)
        dice = np.concatenate((leftpad, framedata, rightpad), 1)
        sendframe(dice)
        printframe(dice)
        fb = render_text('\033[31;48;5;167;4;6mfoo\033[0;91mbar\033[93;106;5mbaz\033[0m\033[0;94;6m♥♥♥');