pragma Singleton
pragma ComponentBehavior: Bound

import Quickshell
import Quickshell.Io
import QtQuick
import ZShell
import qs.Helpers
import qs.Paths

Singleton {
	id: root

	readonly property M3Palette current: M3Palette {
	}
	property bool currentLight
	property string flavour
	readonly property bool light: showPreview ? previewLight : currentLight
	readonly property M3Palette palette: showPreview ? preview : current
	readonly property M3Palette preview: M3Palette {
	}
	property bool previewLight
	property string scheme
	property bool showPreview
	readonly property M3TPalette tPalette: M3TPalette {
	}
	readonly property Transparency transparency: Transparency {
	}
	readonly property alias wallLuminance: analyser.luminance

	function alterColor(c: color, a: real, layer: int): color {
		const initLuminance = getLuminance(c);
		const luminance = Math.max(initLuminance, 0.001);

		const offset = (!light || layer == 1 ? 1 : -layer / 2) * (light ? 0.2 : 0.3) * (0.2 + 0.3 * (1 - transparency.base)) * (1 + wallLuminance * (light ? (layer == 1 ? 3 : 1) : 2.5));
		const scale = (luminance + offset) / luminance;
		const r = Math.max(0, Math.min(1, c.r * scale));
		const g = Math.max(0, Math.min(1, c.g * scale));
		const b = Math.max(0, Math.min(1, c.b * scale));

		return Qt.rgba(r, g, b, a);
	}

	function getLuminance(c: color): real {
		if (c.r == 0 && c.g == 0 && c.b == 0)
			return 0;
		return Math.sqrt(0.299 * (c.r ** 2) + 0.587 * (c.g ** 2) + 0.114 * (c.b ** 2));
	}

	function layer(c: color, layer: var): color {
		if (!transparency.enabled)
			return c;

		return layer === 0 ? Qt.alpha(c, transparency.base) : alterColor(c, transparency.layers, layer ?? 1);
	}

	function load(data: string, isPreview: bool): void {
		const colors = isPreview ? preview : current;
		const scheme = JSON.parse(data);

		if (!isPreview) {
			root.scheme = scheme.name;
			flavour = scheme.flavor;
			currentLight = scheme.mode === "light";
		} else {
			previewLight = scheme.mode === "light";
		}

		for (const [name, color] of Object.entries(scheme.colors)) {
			const propName = name.startsWith("term") ? name : `m3${name}`;
			if (colors.hasOwnProperty(propName))
				colors[propName] = `${color}`;
		}
	}

	function on(c: color): color {
		if (c.hslLightness < 0.5)
			return Qt.hsla(c.hslHue, c.hslSaturation, 0.9, 1);
		return Qt.hsla(c.hslHue, c.hslSaturation, 0.1, 1);
	}

	function setMode(mode: string): void {
		Quickshell.execDetached(["zshell-cli", "scheme", "generate", "--mode", mode]);
		Config.general.color.mode = mode;
		Config.save();
	}

	function swapRG(c: color): color {
		return Qt.rgba(c.g, c.r, c.b, c.a);
	}

	FileView {
		path: "/etc/zshell-greeter/scheme.json"
		watchChanges: true

		onFileChanged: reload()
		onLoaded: root.load(text(), false)
	}

	ImageAnalyser {
		id: analyser

		source: WallpaperPath.lockscreenBg
	}

	component M3Palette: QtObject {
		property color m3background: "#191114"
		property color m3error: "#ffb4ab"
		property color m3errorContainer: "#93000a"
		property color m3inverseOnSurface: "#372e30"
		property color m3inversePrimary: "#8b4a62"
		property color m3inverseSurface: "#efdfe2"
		property color m3neutral_paletteKeyColor: "#807477"
		property color m3neutral_variant_paletteKeyColor: "#837377"
		property color m3onBackground: "#efdfe2"
		property color m3onError: "#690005"
		property color m3onErrorContainer: "#ffdad6"
		property color m3onPrimary: "#541d34"
		property color m3onPrimaryContainer: "#ffd9e3"
		property color m3onPrimaryFixed: "#39071f"
		property color m3onPrimaryFixedVariant: "#6f334a"
		property color m3onSecondary: "#422932"
		property color m3onSecondaryContainer: "#ffd9e3"
		property color m3onSecondaryFixed: "#2b151d"
		property color m3onSecondaryFixedVariant: "#5a3f48"
		property color m3onSuccess: "#213528"
		property color m3onSuccessContainer: "#D1E9D6"
		property color m3onSurface: "#efdfe2"
		property color m3onSurfaceVariant: "#d5c2c6"
		property color m3onTertiary: "#48290c"
		property color m3onTertiaryContainer: "#000000"
		property color m3onTertiaryFixed: "#2f1500"
		property color m3onTertiaryFixedVariant: "#623f21"
		property color m3outline: "#9e8c91"
		property color m3outlineVariant: "#514347"
		property color m3primary: "#ffb0ca"
		property color m3primaryContainer: "#6f334a"
		property color m3primaryFixed: "#ffd9e3"
		property color m3primaryFixedDim: "#ffb0ca"
		property color m3primary_paletteKeyColor: "#a8627b"
		property color m3scrim: "#000000"
		property color m3secondary: "#e2bdc7"
		property color m3secondaryContainer: "#5a3f48"
		property color m3secondaryFixed: "#ffd9e3"
		property color m3secondaryFixedDim: "#e2bdc7"
		property color m3secondary_paletteKeyColor: "#8e6f78"
		property color m3shadow: "#000000"
		property color m3success: "#B5CCBA"
		property color m3successContainer: "#374B3E"
		property color m3surface: "#191114"
		property color m3surfaceBright: "#403739"
		property color m3surfaceContainer: "#261d20"
		property color m3surfaceContainerHigh: "#31282a"
		property color m3surfaceContainerHighest: "#3c3235"
		property color m3surfaceContainerLow: "#22191c"
		property color m3surfaceContainerLowest: "#130c0e"
		property color m3surfaceDim: "#191114"
		property color m3surfaceTint: "#ffb0ca"
		property color m3surfaceVariant: "#514347"
		property color m3tertiary: "#f0bc95"
		property color m3tertiaryContainer: "#b58763"
		property color m3tertiaryFixed: "#ffdcc3"
		property color m3tertiaryFixedDim: "#f0bc95"
		property color m3tertiary_paletteKeyColor: "#986e4c"
	}
	component M3TPalette: QtObject {
		readonly property color m3background: root.layer(root.palette.m3background, 0)
		readonly property color m3error: root.layer(root.palette.m3error)
		readonly property color m3errorContainer: root.layer(root.palette.m3errorContainer)
		readonly property color m3inverseOnSurface: root.layer(root.palette.m3inverseOnSurface)
		readonly property color m3inversePrimary: root.layer(root.palette.m3inversePrimary)
		readonly property color m3inverseSurface: root.layer(root.palette.m3inverseSurface, 0)
		readonly property color m3neutral_paletteKeyColor: root.layer(root.palette.m3neutral_paletteKeyColor)
		readonly property color m3neutral_variant_paletteKeyColor: root.layer(root.palette.m3neutral_variant_paletteKeyColor)
		readonly property color m3onBackground: root.layer(root.palette.m3onBackground)
		readonly property color m3onError: root.layer(root.palette.m3onError)
		readonly property color m3onErrorContainer: root.layer(root.palette.m3onErrorContainer)
		readonly property color m3onPrimary: root.layer(root.palette.m3onPrimary)
		readonly property color m3onPrimaryContainer: root.layer(root.palette.m3onPrimaryContainer)
		readonly property color m3onPrimaryFixed: root.layer(root.palette.m3onPrimaryFixed)
		readonly property color m3onPrimaryFixedVariant: root.layer(root.palette.m3onPrimaryFixedVariant)
		readonly property color m3onSecondary: root.layer(root.palette.m3onSecondary)
		readonly property color m3onSecondaryContainer: root.layer(root.palette.m3onSecondaryContainer)
		readonly property color m3onSecondaryFixed: root.layer(root.palette.m3onSecondaryFixed)
		readonly property color m3onSecondaryFixedVariant: root.layer(root.palette.m3onSecondaryFixedVariant)
		readonly property color m3onSuccess: root.layer(root.palette.m3onSuccess)
		readonly property color m3onSuccessContainer: root.layer(root.palette.m3onSuccessContainer)
		readonly property color m3onSurface: root.layer(root.palette.m3onSurface)
		readonly property color m3onSurfaceVariant: root.layer(root.palette.m3onSurfaceVariant)
		readonly property color m3onTertiary: root.layer(root.palette.m3onTertiary)
		readonly property color m3onTertiaryContainer: root.layer(root.palette.m3onTertiaryContainer)
		readonly property color m3onTertiaryFixed: root.layer(root.palette.m3onTertiaryFixed)
		readonly property color m3onTertiaryFixedVariant: root.layer(root.palette.m3onTertiaryFixedVariant)
		readonly property color m3outline: root.layer(root.palette.m3outline)
		readonly property color m3outlineVariant: root.layer(root.palette.m3outlineVariant)
		readonly property color m3primary: root.layer(root.palette.m3primary)
		readonly property color m3primaryContainer: root.layer(root.palette.m3primaryContainer)
		readonly property color m3primaryFixed: root.layer(root.palette.m3primaryFixed)
		readonly property color m3primaryFixedDim: root.layer(root.palette.m3primaryFixedDim)
		readonly property color m3primary_paletteKeyColor: root.layer(root.palette.m3primary_paletteKeyColor)
		readonly property color m3scrim: root.layer(root.palette.m3scrim)
		readonly property color m3secondary: root.layer(root.palette.m3secondary)
		readonly property color m3secondaryContainer: root.layer(root.palette.m3secondaryContainer)
		readonly property color m3secondaryFixed: root.layer(root.palette.m3secondaryFixed)
		readonly property color m3secondaryFixedDim: root.layer(root.palette.m3secondaryFixedDim)
		readonly property color m3secondary_paletteKeyColor: root.layer(root.palette.m3secondary_paletteKeyColor)
		readonly property color m3shadow: root.layer(root.palette.m3shadow)
		readonly property color m3success: root.layer(root.palette.m3success)
		readonly property color m3successContainer: root.layer(root.palette.m3successContainer)
		readonly property color m3surface: root.layer(root.palette.m3surface, 0)
		readonly property color m3surfaceBright: root.layer(root.palette.m3surfaceBright, 0)
		readonly property color m3surfaceContainer: root.layer(root.palette.m3surfaceContainer)
		readonly property color m3surfaceContainerHigh: root.layer(root.palette.m3surfaceContainerHigh)
		readonly property color m3surfaceContainerHighest: root.layer(root.palette.m3surfaceContainerHighest)
		readonly property color m3surfaceContainerLow: root.layer(root.palette.m3surfaceContainerLow)
		readonly property color m3surfaceContainerLowest: root.layer(root.palette.m3surfaceContainerLowest)
		readonly property color m3surfaceDim: root.layer(root.palette.m3surfaceDim, 0)
		readonly property color m3surfaceTint: root.layer(root.palette.m3surfaceTint)
		readonly property color m3surfaceVariant: root.layer(root.palette.m3surfaceVariant, 0)
		readonly property color m3tertiary: root.layer(root.palette.m3tertiary)
		readonly property color m3tertiaryContainer: root.layer(root.palette.m3tertiaryContainer)
		readonly property color m3tertiaryFixed: root.layer(root.palette.m3tertiaryFixed)
		readonly property color m3tertiaryFixedDim: root.layer(root.palette.m3tertiaryFixedDim)
		readonly property color m3tertiary_paletteKeyColor: root.layer(root.palette.m3tertiary_paletteKeyColor)
	}
	component Transparency: QtObject {
		readonly property real base: Math.max(0, Math.min(1, Appearance.transparency.base - (root.light ? 0.1 : 0)))
		readonly property bool enabled: Appearance.transparency.enabled
		readonly property real layers: Appearance.transparency.layers

		onBaseChanged: debounceTimer.restart()
		onEnabledChanged: debounceTimer.restart()
	}
}
