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import re
import sys
from colorsys import rgb_to_hls
from enum import IntEnum
from functools import lru_cache
from typing import TYPE_CHECKING, NamedTuple, Optional, Tuple

from ._palettes import EIGHT_BIT_PALETTE, STANDARD_PALETTE, WINDOWS_PALETTE
from .color_triplet import ColorTriplet
from .repr import Result, rich_repr
from .terminal_theme import DEFAULT_TERMINAL_THEME

if TYPE_CHECKING:  # pragma: no cover
    from .terminal_theme import TerminalTheme
    from .text import Text

WINDOWS = sys.platform == "win32"

class ColorSystem(IntEnum):
    """One of the 3 color system supported by terminals."""

STANDARD = 1
    EIGHT_BIT = 2
    TRUECOLOR = 3
    WINDOWS = 4

def __repr__(self) -> str:
        return f"ColorSystem.{self.name}"

def __str__(self) -> str:
        return repr(self)

class ColorType(IntEnum):
    """Type of color stored in Color class."""

DEFAULT = 0
    STANDARD = 1
    EIGHT_BIT = 2
    TRUECOLOR = 3
    WINDOWS = 4

def __repr__(self) -> str:
        return f"ColorType.{self.name}"

ANSI_COLOR_NAMES = {
    "black": 0,
    "red": 1,
    "green": 2,
    "yellow": 3,
    "blue": 4,
    "magenta": 5,
    "cyan": 6,
    "white": 7,
    "bright_black": 8,
    "bright_red": 9,
    "bright_green": 10,
    "bright_yellow": 11,
    "bright_blue": 12,
    "bright_magenta": 13,
    "bright_cyan": 14,
    "bright_white": 15,
    "grey0": 16,
    "gray0": 16,
    "navy_blue": 17,
    "dark_blue": 18,
    "blue3": 20,
    "blue1": 21,
    "dark_green": 22,
    "deep_sky_blue4": 25,
    "dodger_blue3": 26,
    "dodger_blue2": 27,
    "green4": 28,
    "spring_green4": 29,
    "turquoise4": 30,
    "deep_sky_blue3": 32,
    "dodger_blue1": 33,
    "green3": 40,
    "spring_green3": 41,
    "dark_cyan": 36,
    "light_sea_green": 37,
    "deep_sky_blue2": 38,
    "deep_sky_blue1": 39,
    "spring_green2": 47,
    "cyan3": 43,
    "dark_turquoise": 44,
    "turquoise2": 45,
    "green1": 46,
    "spring_green1": 48,
    "medium_spring_green": 49,
    "cyan2": 50,
    "cyan1": 51,
    "dark_red": 88,
    "deep_pink4": 125,
    "purple4": 55,
    "purple3": 56,
    "blue_violet": 57,
    "orange4": 94,
    "grey37": 59,
    "gray37": 59,
    "medium_purple4": 60,
    "slate_blue3": 62,
    "royal_blue1": 63,
    "chartreuse4": 64,
    "dark_sea_green4": 71,
    "pale_turquoise4": 66,
    "steel_blue": 67,
    "steel_blue3": 68,
    "cornflower_blue": 69,
    "chartreuse3": 76,
    "cadet_blue": 73,
    "sky_blue3": 74,
    "steel_blue1": 81,
    "pale_green3": 114,
    "sea_green3": 78,
    "aquamarine3": 79,
    "medium_turquoise": 80,
    "chartreuse2": 112,
    "sea_green2": 83,
    "sea_green1": 85,
    "aquamarine1": 122,
    "dark_slate_gray2": 87,
    "dark_magenta": 91,
    "dark_violet": 128,
    "purple": 129,
    "light_pink4": 95,
    "plum4": 96,
    "medium_purple3": 98,
    "slate_blue1": 99,
    "yellow4": 106,
    "wheat4": 101,
    "grey53": 102,
    "gray53": 102,
    "light_slate_grey": 103,
    "light_slate_gray": 103,
    "medium_purple": 104,
    "light_slate_blue": 105,
    "dark_olive_green3": 149,
    "dark_sea_green": 108,
    "light_sky_blue3": 110,
    "sky_blue2": 111,
    "dark_sea_green3": 150,
    "dark_slate_gray3": 116,
    "sky_blue1": 117,
    "chartreuse1": 118,
    "light_green": 120,
    "pale_green1": 156,
    "dark_slate_gray1": 123,
    "red3": 160,
    "medium_violet_red": 126,
    "magenta3": 164,
    "dark_orange3": 166,
    "indian_red": 167,
    "hot_pink3": 168,
    "medium_orchid3": 133,
    "medium_orchid": 134,
    "medium_purple2": 140,
    "dark_goldenrod": 136,
    "light_salmon3": 173,
    "rosy_brown": 138,
    "grey63": 139,
    "gray63": 139,
    "medium_purple1": 141,
    "gold3": 178,
    "dark_khaki": 143,
    "navajo_white3": 144,
    "grey69": 145,
    "gray69": 145,
    "light_steel_blue3": 146,
    "light_steel_blue": 147,
    "yellow3": 184,
    "dark_sea_green2": 157,
    "light_cyan3": 152,
    "light_sky_blue1": 153,
    "green_yellow": 154,
    "dark_olive_green2": 155,
    "dark_sea_green1": 193,
    "pale_turquoise1": 159,
    "deep_pink3": 162,
    "magenta2": 200,
    "hot_pink2": 169,
    "orchid": 170,
    "medium_orchid1": 207,
    "orange3": 172,
    "light_pink3": 174,
    "pink3": 175,
    "plum3": 176,
    "violet": 177,
    "light_goldenrod3": 179,
    "tan": 180,
    "misty_rose3": 181,
    "thistle3": 182,
    "plum2": 183,
    "khaki3": 185,
    "light_goldenrod2": 222,
    "light_yellow3": 187,
    "grey84": 188,
    "gray84": 188,
    "light_steel_blue1": 189,
    "yellow2": 190,
    "dark_olive_green1": 192,
    "honeydew2": 194,
    "light_cyan1": 195,
    "red1": 196,
    "deep_pink2": 197,
    "deep_pink1": 199,
    "magenta1": 201,
    "orange_red1": 202,
    "indian_red1": 204,
    "hot_pink": 206,
    "dark_orange": 208,
    "salmon1": 209,
    "light_coral": 210,
    "pale_violet_red1": 211,
    "orchid2": 212,
    "orchid1": 213,
    "orange1": 214,
    "sandy_brown": 215,
    "light_salmon1": 216,
    "light_pink1": 217,
    "pink1": 218,
    "plum1": 219,
    "gold1": 220,
    "navajo_white1": 223,
    "misty_rose1": 224,
    "thistle1": 225,
    "yellow1": 226,
    "light_goldenrod1": 227,
    "khaki1": 228,
    "wheat1": 229,
    "cornsilk1": 230,
    "grey100": 231,
    "gray100": 231,
    "grey3": 232,
    "gray3": 232,
    "grey7": 233,
    "gray7": 233,
    "grey11": 234,
    "gray11": 234,
    "grey15": 235,
    "gray15": 235,
    "grey19": 236,
    "gray19": 236,
    "grey23": 237,
    "gray23": 237,
    "grey27": 238,
    "gray27": 238,
    "grey30": 239,
    "gray30": 239,
    "grey35": 240,
    "gray35": 240,
    "grey39": 241,
    "gray39": 241,
    "grey42": 242,
    "gray42": 242,
    "grey46": 243,
    "gray46": 243,
    "grey50": 244,
    "gray50": 244,
    "grey54": 245,
    "gray54": 245,
    "grey58": 246,
    "gray58": 246,
    "grey62": 247,
    "gray62": 247,
    "grey66": 248,
    "gray66": 248,
    "grey70": 249,
    "gray70": 249,
    "grey74": 250,
    "gray74": 250,
    "grey78": 251,
    "gray78": 251,
    "grey82": 252,
    "gray82": 252,
    "grey85": 253,
    "gray85": 253,
    "grey89": 254,
    "gray89": 254,
    "grey93": 255,
    "gray93": 255,
}

class ColorParseError(Exception):
    """The color could not be parsed."""

RE_COLOR = re.compile(
    r"""^
\#([0-9a-f]{6})$|
color$([0-9]{1,3})$$|
rgb$([\d\s,]+)$$
""",
    re.VERBOSE,
)

@rich_repr
class Color(NamedTuple):
    """Terminal color definition."""

name: str
    """The name of the color (typically the input to Color.parse)."""
    type: ColorType
    """The type of the color."""
    number: Optional[int] = None
    """The color number, if a standard color, or None."""
    triplet: Optional[ColorTriplet] = None
    """A triplet of color components, if an RGB color."""

def __rich__(self) -> "Text":
        """Displays the actual color if Rich printed."""
        from .style import Style
        from .text import Text

return Text.assemble(
            f"<color {self.name!r} ({self.type.name.lower()})",
            ("⬤", Style(color=self)),
            " >",
        )

def __rich_repr__(self) -> Result:
        yield self.name
        yield self.type
        yield "number", self.number, None
        yield "triplet", self.triplet, None

@property
    def system(self) -> ColorSystem:
        """Get the native color system for this color."""
        if self.type == ColorType.DEFAULT:
            return ColorSystem.STANDARD
        return ColorSystem(int(self.type))

@property
    def is_system_defined(self) -> bool:
        """Check if the color is ultimately defined by the system."""
        return self.system not in (ColorSystem.EIGHT_BIT, ColorSystem.TRUECOLOR)

@property
    def is_default(self) -> bool:
        """Check if the color is a default color."""
        return self.type == ColorType.DEFAULT

def get_truecolor(
        self, theme: Optional["TerminalTheme"] = None, foreground: bool = True
    ) -> ColorTriplet:
        """Get an equivalent color triplet for this color.

Args:
            theme (TerminalTheme, optional): Optional terminal theme, or None to use default. Defaults to None.
            foreground (bool, optional): True for a foreground color, or False for background. Defaults to True.

Returns:
            ColorTriplet: A color triplet containing RGB components.
        """

if theme is None:
            theme = DEFAULT_TERMINAL_THEME
        if self.type == ColorType.TRUECOLOR:
            assert self.triplet is not None
            return self.triplet
        elif self.type == ColorType.EIGHT_BIT:
            assert self.number is not None
            return EIGHT_BIT_PALETTE[self.number]
        elif self.type == ColorType.STANDARD:
            assert self.number is not None
            return theme.ansi_colors[self.number]
        elif self.type == ColorType.WINDOWS:
            assert self.number is not None
            return WINDOWS_PALETTE[self.number]
        else:  # self.type == ColorType.DEFAULT:
            assert self.number is None
            return theme.foreground_color if foreground else theme.background_color

@classmethod
    def from_ansi(cls, number: int) -> "Color":
        """Create a Color number from it's 8-bit ansi number.

Args:
            number (int): A number between 0-255 inclusive.

Returns:
            Color: A new Color instance.
        """
        return cls(
            name=f"color({number})",
            type=(ColorType.STANDARD if number < 16 else ColorType.EIGHT_BIT),
            number=number,
        )

@classmethod
    def from_triplet(cls, triplet: "ColorTriplet") -> "Color":
        """Create a truecolor RGB color from a triplet of values.

Args:
            triplet (ColorTriplet): A color triplet containing red, green and blue components.

Returns:
            Color: A new color object.
        """
        return cls(name=triplet.hex, type=ColorType.TRUECOLOR, triplet=triplet)

@classmethod
    def from_rgb(cls, red: float, green: float, blue: float) -> "Color":
        """Create a truecolor from three color components in the range(0->255).

Args:
            red (float): Red component in range 0-255.
            green (float): Green component in range 0-255.
            blue (float): Blue component in range 0-255.

Returns:
            Color: A new color object.
        """
        return cls.from_triplet(ColorTriplet(int(red), int(green), int(blue)))

@classmethod
    def default(cls) -> "Color":
        """Get a Color instance representing the default color.

Returns:
            Color: Default color.
        """
        return cls(name="default", type=ColorType.DEFAULT)

@classmethod
    @lru_cache(maxsize=1024)
    def parse(cls, color: str) -> "Color":
        """Parse a color definition."""
        original_color = color
        color = color.lower().strip()

if color == "default":
            return cls(color, type=ColorType.DEFAULT)

color_number = ANSI_COLOR_NAMES.get(color)
        if color_number is not None:
            return cls(
                color,
                type=(ColorType.STANDARD if color_number < 16 else ColorType.EIGHT_BIT),
                number=color_number,
            )

color_match = RE_COLOR.match(color)
        if color_match is None:
            raise ColorParseError(f"{original_color!r} is not a valid color")

color_24, color_8, color_rgb = color_match.groups()
        if color_24:
            triplet = ColorTriplet(
                int(color_24[0:2], 16), int(color_24[2:4], 16), int(color_24[4:6], 16)
            )
            return cls(color, ColorType.TRUECOLOR, triplet=triplet)

elif color_8:
            number = int(color_8)
            if number > 255:
                raise ColorParseError(f"color number must be <= 255 in {color!r}")
            return cls(
                color,
                type=(ColorType.STANDARD if number < 16 else ColorType.EIGHT_BIT),
                number=number,
            )

else:  #  color_rgb:
            components = color_rgb.split(",")
            if len(components) != 3:
                raise ColorParseError(
                    f"expected three components in {original_color!r}"
                )
            red, green, blue = components
            triplet = ColorTriplet(int(red), int(green), int(blue))
            if not all(component <= 255 for component in triplet):
                raise ColorParseError(
                    f"color components must be <= 255 in {original_color!r}"
                )
            return cls(color, ColorType.TRUECOLOR, triplet=triplet)

@lru_cache(maxsize=1024)
    def get_ansi_codes(self, foreground: bool = True) -> Tuple[str, ...]:
        """Get the ANSI escape codes for this color."""
        _type = self.type
        if _type == ColorType.DEFAULT:
            return ("39" if foreground else "49",)

elif _type == ColorType.WINDOWS:
            number = self.number
            assert number is not None
            fore, back = (30, 40) if number < 8 else (82, 92)
            return (str(fore + number if foreground else back + number),)

elif _type == ColorType.STANDARD:
            number = self.number
            assert number is not None
            fore, back = (30, 40) if number < 8 else (82, 92)
            return (str(fore + number if foreground else back + number),)

elif _type == ColorType.EIGHT_BIT:
            assert self.number is not None
            return ("38" if foreground else "48", "5", str(self.number))

else:  # self.standard == ColorStandard.TRUECOLOR:
            assert self.triplet is not None
            red, green, blue = self.triplet
            return ("38" if foreground else "48", "2", str(red), str(green), str(blue))

@lru_cache(maxsize=1024)
    def downgrade(self, system: ColorSystem) -> "Color":
        """Downgrade a color system to a system with fewer colors."""

if self.type in (ColorType.DEFAULT, system):
            return self
        # Convert to 8-bit color from truecolor color
        if system == ColorSystem.EIGHT_BIT and self.system == ColorSystem.TRUECOLOR:
            assert self.triplet is not None
            _h, l, s = rgb_to_hls(*self.triplet.normalized)
            # If saturation is under 15% assume it is grayscale
            if s < 0.15:
                gray = round(l * 25.0)
                if gray == 0:
                    color_number = 16
                elif gray == 25:
                    color_number = 231
                else:
                    color_number = 231 + gray
                return Color(self.name, ColorType.EIGHT_BIT, number=color_number)

red, green, blue = self.triplet
            six_red = red / 95 if red < 95 else 1 + (red - 95) / 40
            six_green = green / 95 if green < 95 else 1 + (green - 95) / 40
            six_blue = blue / 95 if blue < 95 else 1 + (blue - 95) / 40

color_number = (
                16 + 36 * round(six_red) + 6 * round(six_green) + round(six_blue)
            )
            return Color(self.name, ColorType.EIGHT_BIT, number=color_number)

# Convert to standard from truecolor or 8-bit
        elif system == ColorSystem.STANDARD:
            if self.system == ColorSystem.TRUECOLOR:
                assert self.triplet is not None
                triplet = self.triplet
            else:  # self.system == ColorSystem.EIGHT_BIT
                assert self.number is not None
                triplet = ColorTriplet(*EIGHT_BIT_PALETTE[self.number])

color_number = STANDARD_PALETTE.match(triplet)
            return Color(self.name, ColorType.STANDARD, number=color_number)

elif system == ColorSystem.WINDOWS:
            if self.system == ColorSystem.TRUECOLOR:
                assert self.triplet is not None
                triplet = self.triplet
            else:  # self.system == ColorSystem.EIGHT_BIT
                assert self.number is not None
                if self.number < 16:
                    return Color(self.name, ColorType.WINDOWS, number=self.number)
                triplet = ColorTriplet(*EIGHT_BIT_PALETTE[self.number])

color_number = WINDOWS_PALETTE.match(triplet)
            return Color(self.name, ColorType.WINDOWS, number=color_number)

return self

def parse_rgb_hex(hex_color: str) -> ColorTriplet:
    """Parse six hex characters in to RGB triplet."""
    assert len(hex_color) == 6, "must be 6 characters"
    color = ColorTriplet(
        int(hex_color[0:2], 16), int(hex_color[2:4], 16), int(hex_color[4:6], 16)
    )
    return color

def blend_rgb(
    color1: ColorTriplet, color2: ColorTriplet, cross_fade: float = 0.5
) -> ColorTriplet:
    """Blend one RGB color in to another."""
    r1, g1, b1 = color1
    r2, g2, b2 = color2
    new_color = ColorTriplet(
        int(r1 + (r2 - r1) * cross_fade),
        int(g1 + (g2 - g1) * cross_fade),
        int(b1 + (b2 - b1) * cross_fade),
    )
    return new_color

if __name__ == "__main__":  # pragma: no cover
    from .console import Console
    from .table import Table
    from .text import Text

console = Console()

table = Table(show_footer=False, show_edge=True)
    table.add_column("Color", width=10, overflow="ellipsis")
    table.add_column("Number", justify="right", style="yellow")
    table.add_column("Name", style="green")
    table.add_column("Hex", style="blue")
    table.add_column("RGB", style="magenta")

colors = sorted((v, k) for k, v in ANSI_COLOR_NAMES.items())
    for color_number, name in colors:
        if "grey" in name:
            continue
        color_cell = Text(" " * 10, style=f"on {name}")
        if color_number < 16:
            table.add_row(color_cell, f"{color_number}", Text(f'"{name}"'))
        else:
            color = EIGHT_BIT_PALETTE[color_number]  # type: ignore[has-type]
            table.add_row(
                color_cell, str(color_number), Text(f'"{name}"'), color.hex, color.rgb
            )

console.print(table)

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