#!/usr/bin/env python3
#
# Copyright(C) 2005-2014 Simon Howard
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
#
# Converts images into C structures to be inserted in programs
#

import sys
import os
import re

if len(sys.argv) < 3:
    print("Usage: convert-icon <src> <dest>")
    sys.exit(1)

try:
    import Image
except ImportError:
    try:
        from PIL import Image
    except ImportError:
        print(
            "WARNING: Could not update {}\n"
            "Please install the Python Imaging library or Pillow."
            .format([sys.argv[2]])
        )
        sys.exit(1)


def convert_image(filename, output_filename):
    im = Image.open(filename)

    outfile = open(output_filename, "w", encoding="ascii")

    size = im.size

    struct_name = os.path.basename(output_filename)
    struct_name = re.sub(re.compile(r"\..*$"), "", struct_name)
    struct_name = re.sub(re.compile(r"\W"), "_", struct_name)

    outfile.write("static int {}_w = {};\n".format(struct_name, size[0]))
    outfile.write("static int {}_h = {};\n".format(struct_name, size[1]))

    outfile.write("\n")
    outfile.write(
        "static const unsigned int {}_data[] = {{\n".format(struct_name)
    )

    elements_on_line = 0

    outfile.write("    ")

    for y in range(size[1]):
        for x in range(size[0]):
            val = im.getpixel((x, y))
            outfile.write("0x{:02x}{:02x}{:02x}{:02x}, ".format(*val))
            elements_on_line += 1

            if elements_on_line >= 6:
                elements_on_line = 0
                outfile.write("\n")
                outfile.write("    ")

    outfile.write("\n")
    outfile.write("};\n")


convert_image(sys.argv[1], sys.argv[2])
