<?php

declare(strict_types=1);

namespace FlexatechTableReservations\Support;

defined( 'ABSPATH' ) || exit;

/**
 * The plugin's configuration in ONE option (`fxtr_settings`). Partial update
 * by top-level key: a key you send replaces the stored value whole.
 */
final class Settings {

	public const OPTION = 'fxtr_settings';

	/**
	 * @return array<string,mixed>
	 */
	public static function defaults(): array {
		return [
			'lead_time'          => 2,     // minimum hours from now.
			'admin_email'        => '',    // falls back to get_option('admin_email').
			'from_name'          => '',    // falls back to blogname.
			'reminder_hours'     => 24,    // send reminder N hours before (0 = off).
			'webhook_url'        => '',    // POST reservation events here when set.
			'turnstile_site'     => '',    // Cloudflare Turnstile site key (optional).
			'turnstile_secret'   => '',    // Cloudflare Turnstile secret (optional).
			'auto_confirm'       => false, // Confirm online reservations without a call back.
			'approval_party'     => 8,     // Parties larger than this always wait for the owner (0 = no limit).
			'party_max'          => 10,    // Largest party that may book online; bigger ones call.
			'gcal_client_id'     => '',        // Google OAuth client (the owner's own, from Google Cloud).
			'gcal_client_secret' => '',
			'gcal_calendar'      => 'primary', // Calendar the reservations are copied to.
			'gcal_push'          => true,      // Copy reservations to that calendar.
			'gcal_busy_calendar' => '',        // Busy events here block online booking ('' = off).
			'hold_minutes'       => 10,    // A table is kept this long while the guest fills in the form (0 = off).
			'restaurant_name'    => '',    // Shown on the booking page; falls back to blogname.
			'restaurant_address' => '',
			'restaurant_phone'   => '',    // Where a larger party is asked to call.
			'restaurant_image'   => 0,     // Attachment id of the photo on the booking page.
			'restaurant_map'     => false, // Show a Google map of the address under the times.
			'google_signin'      => false, // "Sign in with Google" fills in the name and email (uses gcal_client_id).
		];
	}

	/**
	 * @return array<string,mixed>
	 */
	public static function all(): array {
		$stored = get_option( self::OPTION, [] );
		if ( ! is_array( $stored ) ) {
			$stored = [];
		}

		// Keys an older version stored and this one no longer knows stay out.
		return array_replace( self::defaults(), array_intersect_key( $stored, self::defaults() ) );
	}

	public static function get( string $key, mixed $fallback = null ): mixed {
		$all = self::all();

		return $all[ $key ] ?? $fallback;
	}

	public static function seed(): void {
		if ( null === get_option( self::OPTION, null ) ) {
			add_option( self::OPTION, self::defaults() );
		}
	}

	/**
	 * @param array<string,mixed> $input
	 * @return array<string,mixed>
	 */
	public static function update( array $input ): array {
		$old = self::all();
		$new = array_replace( $old, self::sanitize( $input ) );
		update_option( self::OPTION, $new );

		return $new;
	}

	/**
	 * @param array<string,mixed> $input
	 * @return array<string,mixed>
	 */
	public static function sanitize( array $input ): array {
		$clean = [];

		if ( isset( $input['lead_time'] ) ) {
			$clean['lead_time'] = max( 0, min( 8760, absint( $input['lead_time'] ) ) );
		}
		if ( isset( $input['admin_email'] ) ) {
			$clean['admin_email'] = sanitize_email( (string) $input['admin_email'] );
		}
		if ( isset( $input['from_name'] ) ) {
			$clean['from_name'] = sanitize_text_field( (string) $input['from_name'] );
		}
		if ( isset( $input['reminder_hours'] ) ) {
			$clean['reminder_hours'] = max( 0, min( 8760, absint( $input['reminder_hours'] ) ) );
		}
		if ( isset( $input['webhook_url'] ) ) {
			$clean['webhook_url'] = esc_url_raw( (string) $input['webhook_url'] );
		}
		if ( isset( $input['turnstile_site'] ) ) {
			$clean['turnstile_site'] = sanitize_text_field( (string) $input['turnstile_site'] );
		}
		if ( isset( $input['turnstile_secret'] ) ) {
			$clean['turnstile_secret'] = sanitize_text_field( (string) $input['turnstile_secret'] );
		}
		if ( isset( $input['auto_confirm'] ) ) {
			$clean['auto_confirm'] = (bool) $input['auto_confirm'];
		}
		if ( isset( $input['approval_party'] ) ) {
			$clean['approval_party'] = max( 0, min( 99, absint( $input['approval_party'] ) ) );
		}
		if ( isset( $input['party_max'] ) ) {
			$clean['party_max'] = max( 1, min( 99, absint( $input['party_max'] ) ) );
		}

		foreach ( [ 'gcal_client_id', 'gcal_client_secret', 'gcal_busy_calendar' ] as $key ) {
			if ( isset( $input[ $key ] ) ) {
				$clean[ $key ] = sanitize_text_field( (string) $input[ $key ] );
			}
		}
		if ( isset( $input['gcal_calendar'] ) ) {
			$calendar               = sanitize_text_field( (string) $input['gcal_calendar'] );
			$clean['gcal_calendar'] = '' !== $calendar ? $calendar : 'primary';
		}
		if ( isset( $input['gcal_push'] ) ) {
			$clean['gcal_push'] = (bool) $input['gcal_push'];
		}

		if ( isset( $input['hold_minutes'] ) ) {
			$clean['hold_minutes'] = max( 0, min( 30, absint( $input['hold_minutes'] ) ) );
		}
		foreach ( [ 'restaurant_name', 'restaurant_address', 'restaurant_phone' ] as $key ) {
			if ( isset( $input[ $key ] ) ) {
				$clean[ $key ] = mb_substr( sanitize_text_field( (string) $input[ $key ] ), 0, 200 );
			}
		}
		if ( isset( $input['restaurant_image'] ) ) {
			$image                     = absint( $input['restaurant_image'] );
			$clean['restaurant_image'] = $image > 0 && wp_attachment_is_image( $image ) ? $image : 0;
		}
		foreach ( [ 'restaurant_map', 'google_signin' ] as $key ) {
			if ( isset( $input[ $key ] ) ) {
				$clean[ $key ] = (bool) $input[ $key ];
			}
		}

		return $clean;
	}
}