// Theme constants shared by the admin Theme page and its server action. Kept in
// a plain module because a "use server" file may only export async functions.

// Selectable body fonts. Web-safe stacks render with no extra request; the few
// Google fonts load via a <link> ThemeVars injects when chosen.
export const FONTS: Record<
	string,
	{ label: string; stack: string; google?: string }
> = {
	nunito: {
		label: "Nunito (default)",
		stack: 'var(--font-nunito), "Nunito", sans-serif',
	},
	system: {
		label: "System",
		stack: 'ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif',
	},
	inter: {
		label: "Inter",
		stack: '"Inter", sans-serif',
		google: "Inter:wght@400;600;700;800",
	},
	poppins: {
		label: "Poppins",
		stack: '"Poppins", sans-serif',
		google: "Poppins:wght@400;600;700;800",
	},
	roboto: {
		label: "Roboto",
		stack: '"Roboto", sans-serif',
		google: "Roboto:wght@400;500;700",
	},
	georgia: {
		label: "Georgia (serif)",
		stack: 'Georgia, "Times New Roman", serif',
	},
	trebuchet: {
		label: "Trebuchet",
		stack: '"Trebuchet MS", Verdana, sans-serif',
	},
	verdana: { label: "Verdana", stack: "Verdana, Geneva, sans-serif" },
	comic: {
		label: "Comic (retro)",
		stack: '"Comic Sans MS", "Comic Sans", cursive',
	},
	mono: { label: "Monospace", stack: '"Courier New", ui-monospace, monospace' },
};

// The colour settings ThemeVars injects into :root. Editing these recolours the
// whole site live (ThemeVars reads them on every request).
export const THEME_COLOR_KEYS = [
	"color_primary",
	"color_background",
	"color_surface",
	"color_dropdown",
	"color_navbar",
	"color_navbar_text",
	"color_text",
	"color_text_muted",
	"color_accent",
	"color_success",
	"color_warning",
	"color_error",
	"color_info",
	"button_primary_color",
	"button_text_color",
	"button_secondary_color",
	"button_secondary_text_color",
	"button_danger_color",
	"button_danger_text_color",
	"button_outline_color",
	"button_outline_text_color",
	"link_color",
	"link_hover_color",
	"border_color",
	"panel_border_color",
	"gradient_from",
	"gradient_to",
] as const;

export type ThemeMode = "light" | "dark";
export type ThemeColorKey = (typeof THEME_COLOR_KEYS)[number];
export type ThemePalette = Record<ThemeColorKey, string>;
export type ThemePreset = Record<ThemeMode, ThemePalette>;

// Curated palettes (faithful to the atom theme presets). Each is a full set of
// the colour keys above so applying one fully reskins the site.
const LEGACY_PALETTES: Record<string, Partial<ThemePalette>> = {
	"Atom (golden)": {
		color_primary: "#f59e0b",
		color_background: "#f8fafc",
		color_surface: "#ffffff",
		color_dropdown: "#ffffff",
		color_navbar: "#ffffff",
		color_navbar_text: "#1e293b",
		color_text: "#0f172a",
		color_text_muted: "#64748b",
		color_accent: "#10b981",
		color_success: "#16a34a",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#f59e0b",
		button_text_color: "#1e293b",
		border_color: "#eeb425",
	},
	Midnight: {
		color_primary: "#eeb425",
		color_background: "#0f1117",
		color_surface: "#171a21",
		color_dropdown: "#1f242d",
		color_navbar: "#171a21",
		color_navbar_text: "#e5e7eb",
		color_text: "#e5e7eb",
		color_text_muted: "#9ca3af",
		color_accent: "#22c55e",
		color_success: "#22c55e",
		color_warning: "#facc15",
		color_error: "#f87171",
		color_info: "#38bdf8",
		button_primary_color: "#eeb425",
		button_text_color: "#1a1a2e",
		border_color: "#eeb425",
	},
	Ocean: {
		color_primary: "#0ea5e9",
		color_background: "#f0f9ff",
		color_surface: "#ffffff",
		color_dropdown: "#ffffff",
		color_navbar: "#ffffff",
		color_navbar_text: "#0c4a6e",
		color_text: "#082f49",
		color_text_muted: "#64748b",
		color_accent: "#14b8a6",
		color_success: "#16a34a",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#0ea5e9",
		button_text_color: "#ffffff",
		border_color: "#38bdf8",
	},
	Forest: {
		color_primary: "#16a34a",
		color_background: "#f3faf4",
		color_surface: "#ffffff",
		color_dropdown: "#ffffff",
		color_navbar: "#ffffff",
		color_navbar_text: "#14532d",
		color_text: "#052e16",
		color_text_muted: "#5f6b63",
		color_accent: "#84cc16",
		color_success: "#16a34a",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#16a34a",
		button_text_color: "#ffffff",
		border_color: "#22c55e",
	},
	Sunset: {
		color_primary: "#f97316",
		color_background: "#fff7ed",
		color_surface: "#ffffff",
		color_dropdown: "#ffffff",
		color_navbar: "#ffffff",
		color_navbar_text: "#7c2d12",
		color_text: "#431407",
		color_text_muted: "#78716c",
		color_accent: "#ec4899",
		color_success: "#16a34a",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#f97316",
		button_text_color: "#ffffff",
		border_color: "#fb923c",
	},
	Candy: {
		color_primary: "#ec4899",
		color_background: "#fdf2f8",
		color_surface: "#ffffff",
		color_dropdown: "#ffffff",
		color_navbar: "#ffffff",
		color_navbar_text: "#831843",
		color_text: "#500724",
		color_text_muted: "#9d6b80",
		color_accent: "#a855f7",
		color_success: "#16a34a",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#ec4899",
		button_text_color: "#ffffff",
		border_color: "#f472b6",
	},
	Galaxy: {
		color_primary: "#a855f7",
		color_background: "#0b0a1f",
		color_surface: "#171430",
		color_dropdown: "#211d44",
		color_navbar: "#171430",
		color_navbar_text: "#e9e5ff",
		color_text: "#e9e5ff",
		color_text_muted: "#a39dcf",
		color_accent: "#22d3ee",
		color_success: "#22c55e",
		color_warning: "#facc15",
		color_error: "#f87171",
		color_info: "#38bdf8",
		button_primary_color: "#a855f7",
		button_text_color: "#ffffff",
		border_color: "#7c3aed",
	},
	Royal: {
		color_primary: "#4f46e5",
		color_background: "#f5f6ff",
		color_surface: "#ffffff",
		color_dropdown: "#ffffff",
		color_navbar: "#ffffff",
		color_navbar_text: "#1e1b4b",
		color_text: "#1e1b4b",
		color_text_muted: "#636681",
		color_accent: "#d97706",
		color_success: "#16a34a",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#4f46e5",
		button_text_color: "#ffffff",
		border_color: "#818cf8",
	},
	Cyberpunk: {
		color_primary: "#f0db4f",
		color_background: "#0d0221",
		color_surface: "#190933",
		color_dropdown: "#241046",
		color_navbar: "#190933",
		color_navbar_text: "#f0db4f",
		color_text: "#f5e9ff",
		color_text_muted: "#b08fd6",
		color_accent: "#ff2a6d",
		color_success: "#22c55e",
		color_warning: "#facc15",
		color_error: "#f87171",
		color_info: "#38bdf8",
		button_primary_color: "#ff2a6d",
		button_text_color: "#ffffff",
		border_color: "#05d9e8",
	},
	Neon: {
		color_primary: "#39ff14",
		color_background: "#0a0a0a",
		color_surface: "#141414",
		color_dropdown: "#1d1d1d",
		color_navbar: "#141414",
		color_navbar_text: "#39ff14",
		color_text: "#e8ffe8",
		color_text_muted: "#7fae7f",
		color_accent: "#ff00ff",
		color_success: "#22c55e",
		color_warning: "#facc15",
		color_error: "#f87171",
		color_info: "#38bdf8",
		button_primary_color: "#39ff14",
		button_text_color: "#0a0a0a",
		border_color: "#39ff14",
	},
	Coffee: {
		color_primary: "#a16207",
		color_background: "#f5efe6",
		color_surface: "#fffaf2",
		color_dropdown: "#fffaf2",
		color_navbar: "#fffaf2",
		color_navbar_text: "#3f2d1c",
		color_text: "#3f2d1c",
		color_text_muted: "#8a7560",
		color_accent: "#15803d",
		color_success: "#16a34a",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#a16207",
		button_text_color: "#ffffff",
		border_color: "#ca8a04",
	},
	Arctic: {
		color_primary: "#0891b2",
		color_background: "#eef6fb",
		color_surface: "#ffffff",
		color_dropdown: "#ffffff",
		color_navbar: "#ffffff",
		color_navbar_text: "#0e3a4f",
		color_text: "#0e3a4f",
		color_text_muted: "#5b7585",
		color_accent: "#6366f1",
		color_success: "#16a34a",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#0891b2",
		button_text_color: "#ffffff",
		border_color: "#67e8f9",
	},
	Christmas: {
		color_primary: "#dc2626",
		color_background: "#f4faf4",
		color_surface: "#ffffff",
		color_dropdown: "#ffffff",
		color_navbar: "#0f3d24",
		color_navbar_text: "#ffffff",
		color_text: "#14321f",
		color_text_muted: "#5f7a68",
		color_accent: "#15803d",
		color_success: "#22c55e",
		color_warning: "#eab308",
		color_error: "#ef4444",
		color_info: "#0ea5e9",
		button_primary_color: "#dc2626",
		button_text_color: "#ffffff",
		border_color: "#16a34a",
	},
	Dusk: {
		color_primary: "#e8a33d",
		color_background: "#1b2230",
		color_surface: "#232c3d",
		color_dropdown: "#2b3548",
		color_navbar: "#232c3d",
		color_navbar_text: "#dfe5ef",
		color_text: "#dfe5ef",
		color_text_muted: "#94a0b5",
		color_accent: "#5eb0c9",
		color_success: "#22c55e",
		color_warning: "#facc15",
		color_error: "#f87171",
		color_info: "#38bdf8",
		button_primary_color: "#e8a33d",
		button_text_color: "#1b2230",
		border_color: "#e8a33d",
	},
};

const LIGHT_BASE: ThemePalette = {
	color_primary: "#f59e0b",
	color_background: "#f8fafc",
	color_surface: "#ffffff",
	color_dropdown: "#ffffff",
	color_navbar: "#ffffff",
	color_navbar_text: "#1e293b",
	color_text: "#0f172a",
	color_text_muted: "#64748b",
	color_accent: "#10b981",
	color_success: "#16a34a",
	color_warning: "#eab308",
	color_error: "#ef4444",
	color_info: "#0ea5e9",
	button_primary_color: "#f59e0b",
	button_text_color: "#1e293b",
	button_secondary_color: "#22c55e",
	button_secondary_text_color: "#ffffff",
	button_danger_color: "#ef4444",
	button_danger_text_color: "#ffffff",
	button_outline_color: "#eeb425",
	button_outline_text_color: "#1a1a2e",
	link_color: "#b77900",
	link_hover_color: "#8a5b00",
	border_color: "#eeb425",
	panel_border_color: "#e9b124",
	gradient_from: "#f59e0b",
	gradient_to: "#10b981",
};

const DARK_BASE: ThemePalette = {
	...LIGHT_BASE,
	color_background: "#0b0d14",
	color_surface: "#141820",
	color_dropdown: "#1d222b",
	color_navbar: "#141820",
	color_navbar_text: "#e5e7eb",
	color_text: "#e5e7eb",
	color_text_muted: "#94a3b8",
	button_text_color: "#0b0d14",
	button_secondary_text_color: "#08130b",
	button_danger_text_color: "#160606",
	button_outline_text_color: "#f8fafc",
	link_color: "#f6c453",
	link_hover_color: "#ffe08a",
};

const DARK_FIRST = new Set(["Midnight", "Galaxy", "Cyberpunk", "Neon", "Dusk"]);

function brandValues(source: Partial<ThemePalette>): Partial<ThemePalette> {
	return {
		color_primary: source.color_primary,
		color_accent: source.color_accent,
		color_success: source.color_success,
		color_warning: source.color_warning,
		color_error: source.color_error,
		color_info: source.color_info,
		button_primary_color: source.button_primary_color ?? source.color_primary,
		border_color: source.border_color ?? source.color_primary,
		panel_border_color:
			source.panel_border_color ?? source.border_color ?? source.color_primary,
		gradient_from: source.color_primary,
		gradient_to: source.color_accent,
		button_outline_color: source.border_color ?? source.color_primary,
	};
}

function completePalette(
	base: ThemePalette,
	values: Partial<ThemePalette>,
): ThemePalette {
	const merged = { ...base, ...values };
	merged.button_secondary_color =
		values.button_secondary_color ?? merged.color_accent;
	merged.button_outline_color =
		values.button_outline_color ?? merged.border_color;
	merged.panel_border_color = values.panel_border_color ?? merged.border_color;
	merged.gradient_from = values.gradient_from ?? merged.color_primary;
	merged.gradient_to = values.gradient_to ?? merged.color_accent;
	return merged;
}

export const PRESETS: Record<string, ThemePreset> = Object.fromEntries(
	Object.entries(LEGACY_PALETTES).map(([name, palette]) => {
		const light = DARK_FIRST.has(name)
			? completePalette(LIGHT_BASE, brandValues(palette))
			: completePalette(LIGHT_BASE, palette);
		const dark = DARK_FIRST.has(name)
			? completePalette(DARK_BASE, palette)
			: completePalette(DARK_BASE, brandValues(palette));
		return [name, { light, dark } satisfies ThemePreset];
	}),
);