import type { Currency } from '$libs/currency';
import type { Locale } from '$libs/locale';
import type { Timezone } from '$libs/timezone';

import { currencyDimension } from './dimensions/currency.ts';
import { densityDimension } from './dimensions/density.ts';
import { directionDimension } from './dimensions/direction.ts';
import { languageDimension } from './dimensions/language.ts';
import { localeDimension } from './dimensions/locale.ts';
import { motionDimension } from './dimensions/motion.ts';
import { themeDimension } from './dimensions/theme.ts';
import { timezoneDimension } from './dimensions/timezone.ts';
import { unitSystemDimension } from './dimensions/unit-system.ts';

/**
 * Catalog input for `standardPrefsDimensions`. Apps declare which
 * languages, locales and currencies they support; the preset wires the
 * canonical built-ins around them.
 */
export interface StandardPrefsCatalog {
	readonly languages: readonly Locale[];
	readonly locales: readonly Locale[];
	readonly currencies: readonly Currency[];
	/** Optional IANA zone allowlist; omit for "any zone Intl can canonicalize". */
	readonly timezones?: readonly Timezone[];
	/**
	 * Optional per-dimension defaults. When omitted each dimension picks
	 * its own — usually the first entry in its catalog.
	 */
	readonly defaults?: {
		readonly language?: Locale;
		readonly locale?: Locale;
		readonly currency?: Currency;
		readonly timezone?: Timezone;
	};
}

/**
 * Compose the canonical built-in dimensions around the application's
 * catalogs. Returns the schema fragment so apps can spread it into
 * their full schema:
 *
 * ```ts
 * const schema = {
 *     ...standardPrefsDimensions({ languages, locales, currencies }),
 *     // App-specific dimensions
 *     sidebarCollapsed: booleanDimension({ default: false }),
 *     notificationLevel: enumDimension(['all','mentions','none'] as const, { default: 'mentions' })
 * };
 *
 * createActiveApp({ prefs: { schema } });
 * ```
 *
 * Apps that don't want a particular built-in (say, a single-currency
 * app skipping `currency`) drop the entry after spreading or compose a
 * subset by hand instead of using this preset.
 */
export function standardPrefsDimensions(catalog: StandardPrefsCatalog) {
	const defaults = catalog.defaults ?? {};
	return {
		language: languageDimension({ catalog: catalog.languages, default: defaults.language }),
		locale: localeDimension({ catalog: catalog.locales, default: defaults.locale }),
		currency: currencyDimension({ catalog: catalog.currencies, default: defaults.currency }),
		timezone: timezoneDimension({ catalog: catalog.timezones, default: defaults.timezone }),
		unitSystem: unitSystemDimension(),
		theme: themeDimension(),
		density: densityDimension(),
		motion: motionDimension(),
		direction: directionDimension()
	} as const;
}

/**
 * Neutral baseline used by `createActiveApp` when the caller omits
 * `options.prefs`. Keeps the core surface populated even for apps that
 * don't think about preferences. Apps that DO care override
 * `options.prefs.schema`.
 */
export const NEUTRAL_PREFS_SCHEMA = standardPrefsDimensions({
	languages: ['en'],
	locales: ['en-US'],
	currencies: ['USD']
});

export type StandardPrefsSchema = ReturnType<typeof standardPrefsDimensions>;