import { Provider, context, type ProviderOpts } from '../../provider';
import {
	createAttrs,
	registerContract
} from '$uix/morfo';
import {
	type Active,
	type ActiveProps,
	type StateProps
} from '$libs/reactive';
import type { OnChangeFn, Direction } from '../../types';
import { Soma } from '../../core/soma.svelte';
import type {
	DateValue,
	DateMatcher,
	DateOnInvalid,
	DateValidator,
	EditableSegmentPart,
	Granularity,
	HourCycle,
	WeekStartsOn
} from '../../external/dates';

// ── Contract ─────────────────────────────────────────────────────────────────

import { datePickerMorfo } from '../../../morfo/components/date-picker';

const attrs = createAttrs(datePickerMorfo);
registerContract(datePickerMorfo);

// ── Provider (context — shared state for DateField + Popover + Calendar) ────

interface DatePickerOpts
	extends
		ProviderOpts,
		StateProps<{
			value: DateValue | undefined;
			placeholder: DateValue;
			open: boolean;
		}>,
		ActiveProps<{
			// Validation
			validate: DateValidator | undefined;
			onInvalid: DateOnInvalid | undefined;
			minValue: DateValue | undefined;
			maxValue: DateValue | undefined;
			isDateDisabled: DateMatcher | undefined;
			isDateUnavailable: DateMatcher | undefined;
			// State flags
			disabled: boolean;
			readonly: boolean;
			readonlySegments: EditableSegmentPart[];
			required: boolean;
			closeOnDateSelect: boolean;
			// Format / i18n
			granularity: Granularity | undefined;
			hideTimeZone: boolean;
			hourCycle: HourCycle | undefined;
			locale: string | undefined;
			dir: Direction;
			// Calendar options
			pagedNavigation: boolean;
			weekStartsOn: WeekStartsOn | undefined;
			weekdayFormat: Intl.DateTimeFormatOptions['weekday'];
			fixedWeeks: boolean;
			numberOfMonths: number;
			calendarLabel: string | undefined;
			disableDaysOutsideMonth: boolean;
			preventDeselect: boolean;
			initialFocus: boolean;
			monthFormat: Intl.DateTimeFormatOptions['month'] | ((month: number) => string);
			yearFormat: Intl.DateTimeFormatOptions['year'] | ((year: number) => string);
			showWeekNumbers: boolean;
			weekNumberFormat: 'iso' | 'simple';
			isDateHoliday: DateMatcher | undefined;
			announceNavigation: boolean;
			// ARIA
			errorMessageId: string | undefined;
			// Callbacks
			onOpenChangeComplete: OnChangeFn<boolean>;
		}> {}

/**
 * Shared-state coordinator for DatePicker. The wrapper also creates a
 * `PopoverProvider` and a `DateFieldProvider` pointing at the same reactive
 * sources; `DatePicker.Calendar` creates a `CalendarProvider` likewise. This
 * class exists so every sub-part can reach the same value / placeholder /
 * open flags through a single context.
 */
export class DatePickerProvider extends Provider<DatePickerOpts> {
	static readonly ctx = context<DatePickerProvider>('DatePicker');
	static get(): DatePickerProvider | undefined {
		return this.ctx.getOr(undefined) as DatePickerProvider | undefined;
	}
	static require(): DatePickerProvider {
		return this.ctx.get();
	}

	static create(opts: DatePickerOpts) {
		return new DatePickerProvider(opts);
	}

	readonly soma = Soma.get();

	private constructor(opts: DatePickerOpts) {
		super(opts, 'DatePicker', 'provider', attrs.provider, DatePickerProvider.ctx);
	}

	/** Close the popover if `closeOnDateSelect` is `true`. Called by the Calendar. */
	handleDateSelect(): void {
		if (this.opts.closeOnDateSelect.current) {
			this.opts.open.current = false;
		}
	}
}

export { attrs as datePickerAttrs };