from webcolors import html4_hex_to_names, hex_to_rgb

# 16 основных цветов, hex соответвуют hex цветам livecarta
# названия другие
html4_hex_to_names = {'#00ffff': 'aqua', '#000000': 'black', '#0000ff': 'blue', '#ff00ff': 'fuchsia',
                      '#008000': 'green', '#808080': 'grey', '#00ff00': 'lime', '#800000': 'maroon', '#000080': 'navy',
                      '#808000': 'olive', '#800080': 'purple', '#ff0000': 'red', '#c0c0c0': 'silver', '#008080': 'teal',
                      '#ffffff': 'white', '#ffff00': 'yellow'}


def rgb2hsv(r, g, b):
    r /= 255
    g /= 255
    b /= 255
    max_c = max(r, g, b)
    min_c = min(r, g, b)
    value = max_c
    if min_c == max_c:
        return 0.0, 0.0, value * 100

    saturation = (max_c - min_c) / max_c
    rc = (max_c - r) / (max_c - min_c)
    gc = (max_c - g) / (max_c - min_c)
    bc = (max_c - b) / (max_c - min_c)

    if r == max_c:
        hue = 0.0 + bc - gc
    elif g == max_c:
        hue = 2.0 + rc - bc
    else:
        hue = 4.0 + gc - rc

    hue2 = ((hue + 6) / 6.0) if (hue < 0) else (hue / 6.0)

    return hue2 * 360, saturation * 100, value * 100


HTML_COLORS_HSV = {}
for key, name in html4_hex_to_names.items():
    r, g, b = hex_to_rgb(key)
    h, s, v = rgb2hsv(r, g, b)
    HTML_COLORS_HSV[name] = (h, s, v)


def rgb2closest_html_color_name(color):
    """

    - get color in hsv (hue, saturation, value)
    - try to match with black, grey, silver (black, darkGray, lightGray) as this colors matches badly even in hsv model

    - calc hue difference between color and all base colors
    - if for new base color hue diff same as for any other, try to measure saturation and value
    (it happens for similar colors like red - pink, blue - dark blue)

    :param color:  str, color in hex
    :return: base color name that matches best to a given color
    """

    if color == (255, 255, 255):
        return 'white'

    diff2base_color_dict = {}
    rgb = hex_to_rgb(color)
    hue_request, s_request, v_request = rgb2hsv(*rgb)
    if v_request <= 30:
        return 'black'
    if v_request <= 50 and s_request <= 25:  # **
        return 'gray'
    if s_request <= 10 and (90 <= v_request <= 100):
        return 'white'
    if s_request <= 40:
        return 'silver'

    for _, name in html4_hex_to_names.items():
        if name in ['white', 'black', 'grey', 'silver']:
            continue
        hue_html, s_html, v_html = HTML_COLORS_HSV[name]

        hue_diff = abs(hue_html - hue_request)

        if hue_diff == 20:
            pass

        if hue_diff in diff2base_color_dict:
            dist_cur_color =(hue_request - hue_html) ** 2 + (s_request - s_html) ** 2 + (v_request - v_html) ** 2
            hue_prev, s_prev, v_prev = HTML_COLORS_HSV[diff2base_color_dict[hue_diff]]
            dist_prev_color = (hue_request - hue_prev) ** 2 + (s_request - s_prev) ** 2 + (v_request - v_prev) ** 2
            if dist_cur_color < dist_prev_color:
                diff2base_color_dict[hue_diff] = name
        else:
            diff2base_color_dict[hue_diff] = name
    return diff2base_color_dict[min(diff2base_color_dict.keys())]


if __name__ == '__main__':

    hex_colors = [
        #'#945893',
        # '#96F',
        # '#000', # black
        # '#4C4C4C', # black
        # '#A00',
        # '#99F',
        '#f89921',

        # '#f89921', '#EFF8F6'
        # '#e5c099',  # yellow
        # '#008b90',  # teal
        # '#c4762a',  # red
        # '#996A95',  '#70416F', # purple
        # '#D5C9D3', '#E9E2E8',  # silver
        # '#FFD472', '#F47B4D', '#FFFBEF', '#F47B4D', # yellow, red ,yellow, red
        # '#B0DFD7', '#EFF8F6', '#5CC4B7'
    ]

    for c in hex_colors:
        n = rgb2closest_html_color_name(c)
        print(n) # "Actual colour:", c, ", closest colour name:",
        # print()