from typing import Literal, Optional

class ThemeManager:
    def __init__(self, theme: Literal["dark", "light"] = "dark"):
        self.use_theme(theme)

    def use_theme(self, theme: str):
        if theme == "dark":
            self.ACCENT = "#ed7d3a"
            self.ACCENT_HOVER = "rgb(236, 194, 169)"
            self.BACKGROUND = "#0e0e0e"
            self.FOREGROUND = "#f0f0f0"
            self.BORDER = "#3a9bed"
            self.SURFACE_MUTED = "#8b8b8b"
            self.SUCCESS = "#4cd964"
            self.ERROR = "red"
            self.DISABLED = "#999999"
            self.DISABLED_BG = "#444444"
            self.DISABLED_BORDER = "#666666"
        else:
            self.ACCENT = "#004488"
            self.ACCENT_HOVER = "#0077cc"
            self.BACKGROUND = "#ffffff"
            self.FOREGROUND = "#000000"
            self.BORDER = "#003366"
            self.SURFACE_MUTED = "#dddddd"
            self.SUCCESS = "#007f00"
            self.ERROR = "#cc0000"
            self.DISABLED = "#cccccc"
            self.DISABLED_BG = "#f0f0f0"
            self.DISABLED_BORDER = "#aaaaaa"

        # Shared base + primary + tonal
        self.DARK = "#000000"
        self.LIGHT = "#ffffff"

        self.PRIMARY_0 = "#6e1106"
        self.PRIMARY_10 = "#812f1f"
        self.PRIMARY_20 = "#934937"
        self.PRIMARY_30 = "#a46251"
        self.PRIMARY_40 = "#b57b6b"
        self.PRIMARY_50 = "#c59487"

        self.SURFACE_0 = "#121212"
        self.SURFACE_10 = "#282828"
        self.SURFACE_20 = "#3f3f3f"
        self.SURFACE_30 = "#575757"
        self.SURFACE_40 = "#717171"
        self.SURFACE_50 = "#8b8b8b"

        self.TONAL_0 = "#1d1411"
        self.TONAL_10 = "#322927"
        self.TONAL_20 = "#48403e"
        self.TONAL_30 = "#605856"
        self.TONAL_40 = "#787270"
        self.TONAL_50 = "#928c8b"

        self.COMPONENT_CLASSES = {
            "palette--foreground",
            "palette--background",
            "palette--accent",
            "palette--accent-hover",
            "palette--border",
            "palette--surface-muted",
            "palette--primary-0",
            "palette--primary-10",
            "palette--primary-20",
            "palette--primary-30",
            "palette--primary-40",
            "palette--primary-50",
            "palette--surface-0",
            "palette--surface-10",
            "palette--surface-20",
            "palette--surface-30",
            "palette--surface-40",
            "palette--surface-50",
            "palette--success",
            "palette--error",
            "palette--disabled",
            "palette-bg--accent",
            "palette-bg--background",
            "palette-bg--surface",
        }


# === Singleton-style global instance ===
_theme_instance: Optional[ThemeManager] = None


def get_theme(theme: Literal["dark", "light"] = "dark") -> ThemeManager:
    global _theme_instance
    if _theme_instance is None:
        _theme_instance = ThemeManager(theme)
    return _theme_instance