from PIL import Image
from functools import partial
from .config import *
from .py3patch import *

import sys
import os

"""
This file is borrowed from following gist:
https://gist.github.com/MicahElliott/719710
It's too slow in compare with C program.
"""

CLUT = [  # color look-up table
    #    8-bit, RGB hex

    # Primary 3-bit (8 colors). Unique representation!
    ('00', '000000'),
    ('01', '800000'),
    ('02', '008000'),
    ('03', '808000'),
    ('04', '000080'),
    ('05', '800080'),
    ('06', '008080'),
    ('07', 'c0c0c0'),

    # Equivalent "bright" versions of original 8 colors.
    ('08', '808080'),
    ('09', 'ff0000'),
    ('10', '00ff00'),
    ('11', 'ffff00'),
    ('12', '0000ff'),
    ('13', 'ff00ff'),
    ('14', '00ffff'),
    ('15', 'ffffff'),

    # Strictly ascending.
    ('16', '000000'),
    ('17', '00005f'),
    ('18', '000087'),
    ('19', '0000af'),
    ('20', '0000d7'),
    ('21', '0000ff'),
    ('22', '005f00'),
    ('23', '005f5f'),
    ('24', '005f87'),
    ('25', '005faf'),
    ('26', '005fd7'),
    ('27', '005fff'),
    ('28', '008700'),
    ('29', '00875f'),
    ('30', '008787'),
    ('31', '0087af'),
    ('32', '0087d7'),
    ('33', '0087ff'),
    ('34', '00af00'),
    ('35', '00af5f'),
    ('36', '00af87'),
    ('37', '00afaf'),
    ('38', '00afd7'),
    ('39', '00afff'),
    ('40', '00d700'),
    ('41', '00d75f'),
    ('42', '00d787'),
    ('43', '00d7af'),
    ('44', '00d7d7'),
    ('45', '00d7ff'),
    ('46', '00ff00'),
    ('47', '00ff5f'),
    ('48', '00ff87'),
    ('49', '00ffaf'),
    ('50', '00ffd7'),
    ('51', '00ffff'),
    ('52', '5f0000'),
    ('53', '5f005f'),
    ('54', '5f0087'),
    ('55', '5f00af'),
    ('56', '5f00d7'),
    ('57', '5f00ff'),
    ('58', '5f5f00'),
    ('59', '5f5f5f'),
    ('60', '5f5f87'),
    ('61', '5f5faf'),
    ('62', '5f5fd7'),
    ('63', '5f5fff'),
    ('64', '5f8700'),
    ('65', '5f875f'),
    ('66', '5f8787'),
    ('67', '5f87af'),
    ('68', '5f87d7'),
    ('69', '5f87ff'),
    ('70', '5faf00'),
    ('71', '5faf5f'),
    ('72', '5faf87'),
    ('73', '5fafaf'),
    ('74', '5fafd7'),
    ('75', '5fafff'),
    ('76', '5fd700'),
    ('77', '5fd75f'),
    ('78', '5fd787'),
    ('79', '5fd7af'),
    ('80', '5fd7d7'),
    ('81', '5fd7ff'),
    ('82', '5fff00'),
    ('83', '5fff5f'),
    ('84', '5fff87'),
    ('85', '5fffaf'),
    ('86', '5fffd7'),
    ('87', '5fffff'),
    ('88', '870000'),
    ('89', '87005f'),
    ('90', '870087'),
    ('91', '8700af'),
    ('92', '8700d7'),
    ('93', '8700ff'),
    ('94', '875f00'),
    ('95', '875f5f'),
    ('96', '875f87'),
    ('97', '875faf'),
    ('98', '875fd7'),
    ('99', '875fff'),
    ('100', '878700'),
    ('101', '87875f'),
    ('102', '878787'),
    ('103', '8787af'),
    ('104', '8787d7'),
    ('105', '8787ff'),
    ('106', '87af00'),
    ('107', '87af5f'),
    ('108', '87af87'),
    ('109', '87afaf'),
    ('110', '87afd7'),
    ('111', '87afff'),
    ('112', '87d700'),
    ('113', '87d75f'),
    ('114', '87d787'),
    ('115', '87d7af'),
    ('116', '87d7d7'),
    ('117', '87d7ff'),
    ('118', '87ff00'),
    ('119', '87ff5f'),
    ('120', '87ff87'),
    ('121', '87ffaf'),
    ('122', '87ffd7'),
    ('123', '87ffff'),
    ('124', 'af0000'),
    ('125', 'af005f'),
    ('126', 'af0087'),
    ('127', 'af00af'),
    ('128', 'af00d7'),
    ('129', 'af00ff'),
    ('130', 'af5f00'),
    ('131', 'af5f5f'),
    ('132', 'af5f87'),
    ('133', 'af5faf'),
    ('134', 'af5fd7'),
    ('135', 'af5fff'),
    ('136', 'af8700'),
    ('137', 'af875f'),
    ('138', 'af8787'),
    ('139', 'af87af'),
    ('140', 'af87d7'),
    ('141', 'af87ff'),
    ('142', 'afaf00'),
    ('143', 'afaf5f'),
    ('144', 'afaf87'),
    ('145', 'afafaf'),
    ('146', 'afafd7'),
    ('147', 'afafff'),
    ('148', 'afd700'),
    ('149', 'afd75f'),
    ('150', 'afd787'),
    ('151', 'afd7af'),
    ('152', 'afd7d7'),
    ('153', 'afd7ff'),
    ('154', 'afff00'),
    ('155', 'afff5f'),
    ('156', 'afff87'),
    ('157', 'afffaf'),
    ('158', 'afffd7'),
    ('159', 'afffff'),
    ('160', 'd70000'),
    ('161', 'd7005f'),
    ('162', 'd70087'),
    ('163', 'd700af'),
    ('164', 'd700d7'),
    ('165', 'd700ff'),
    ('166', 'd75f00'),
    ('167', 'd75f5f'),
    ('168', 'd75f87'),
    ('169', 'd75faf'),
    ('170', 'd75fd7'),
    ('171', 'd75fff'),
    ('172', 'd78700'),
    ('173', 'd7875f'),
    ('174', 'd78787'),
    ('175', 'd787af'),
    ('176', 'd787d7'),
    ('177', 'd787ff'),
    ('178', 'd7af00'),
    ('179', 'd7af5f'),
    ('180', 'd7af87'),
    ('181', 'd7afaf'),
    ('182', 'd7afd7'),
    ('183', 'd7afff'),
    ('184', 'd7d700'),
    ('185', 'd7d75f'),
    ('186', 'd7d787'),
    ('187', 'd7d7af'),
    ('188', 'd7d7d7'),
    ('189', 'd7d7ff'),
    ('190', 'd7ff00'),
    ('191', 'd7ff5f'),
    ('192', 'd7ff87'),
    ('193', 'd7ffaf'),
    ('194', 'd7ffd7'),
    ('195', 'd7ffff'),
    ('196', 'ff0000'),
    ('197', 'ff005f'),
    ('198', 'ff0087'),
    ('199', 'ff00af'),
    ('200', 'ff00d7'),
    ('201', 'ff00ff'),
    ('202', 'ff5f00'),
    ('203', 'ff5f5f'),
    ('204', 'ff5f87'),
    ('205', 'ff5faf'),
    ('206', 'ff5fd7'),
    ('207', 'ff5fff'),
    ('208', 'ff8700'),
    ('209', 'ff875f'),
    ('210', 'ff8787'),
    ('211', 'ff87af'),
    ('212', 'ff87d7'),
    ('213', 'ff87ff'),
    ('214', 'ffaf00'),
    ('215', 'ffaf5f'),
    ('216', 'ffaf87'),
    ('217', 'ffafaf'),
    ('218', 'ffafd7'),
    ('219', 'ffafff'),
    ('220', 'ffd700'),
    ('221', 'ffd75f'),
    ('222', 'ffd787'),
    ('223', 'ffd7af'),
    ('224', 'ffd7d7'),
    ('225', 'ffd7ff'),
    ('226', 'ffff00'),
    ('227', 'ffff5f'),
    ('228', 'ffff87'),
    ('229', 'ffffaf'),
    ('230', 'ffffd7'),
    ('231', 'ffffff'),

    # Gray-scale range.
    ('232', '080808'),
    ('233', '121212'),
    ('234', '1c1c1c'),
    ('235', '262626'),
    ('236', '303030'),
    ('237', '3a3a3a'),
    ('238', '444444'),
    ('239', '4e4e4e'),
    ('240', '585858'),
    ('241', '626262'),
    ('242', '6c6c6c'),
    ('243', '767676'),
    ('244', '808080'),
    ('245', '8a8a8a'),
    ('246', '949494'),
    ('247', '9e9e9e'),
    ('248', 'a8a8a8'),
    ('249', 'b2b2b2'),
    ('250', 'bcbcbc'),
    ('251', 'c6c6c6'),
    ('252', 'd0d0d0'),
    ('253', 'dadada'),
    ('254', 'e4e4e4'),
    ('255', 'eeeeee'),
]


def _create_dicts():
    """
    Create dictionary
    """
    short2rgb_dict = dict(CLUT)
    rgb2short_dict = {}
    for k, v in short2rgb_dict.items():
        rgb2short_dict[v] = k
    return rgb2short_dict, short2rgb_dict

RGB2SHORT_DICT, SHORT2RGB_DICT = _create_dicts()


def short2rgb(short):
    """
    Short to RGB
    """
    return SHORT2RGB_DICT[short]


def pixel_print(ansicolor):
    """
    Print a pixel with given Ansi color
    """
    sys.stdout.write('\033[48;5;%sm \033[0m' % (ansicolor))


def hex_to_rgb(value):
    """
    Hex to RGB
    """
    value = value.lstrip('#')
    lv = len(value)
    return tuple(int(value[i:i + lv / 3], 16) for i in xrange(0, lv, lv / 3))


def rgb_to_hex(rgb):
    """
    RGB to Hex
    """
    return '%02x%02x%02x' % rgb


def rgb2short(r, g, b):
    """
    RGB to short
    """
    dist = lambda s, d: (s[0] - d[0]) ** 2 + \
        (s[1] - d[1]) ** 2 + (s[2] - d[2]) ** 2
    ary = [hex_to_rgb(hex) for hex in RGB2SHORT_DICT]
    m = min(ary, key=partial(dist, (r, g, b)))
    return RGB2SHORT_DICT[rgb_to_hex(m)]


def image_to_display(path, start=None, length=None):
    """
    Display an image
    """
    rows, columns = os.popen('stty size', 'r').read().split()
    if not start:
        start = IMAGE_SHIFT
    if not length:
        length = int(columns) - 2 * start
    i = Image.open(path)
    i = i.convert('RGBA')
    w, h = i.size
    i.load()
    width = min(w, length)
    height = int(float(h) * (float(width) / float(w)))
    height //= 2
    i = i.resize((width, height), Image.BICUBIC)
    height = min(height, IMAGE_MAX_HEIGHT)

    for y in xrange(height):
        sys.stdout.write(' ' * start)
        for x in xrange(width):
            p = i.getpixel((x, y))
            r, g, b = p[:3]
            pixel_print(rgb2short(r, g, b))
        sys.stdout.write('\n')


"""
For direct using purpose
"""
if __name__ == '__main__':
    image_to_display(sys.argv[1])