<?php
namespace Admirly\Wp;

use Admirly\Domain\FieldConfig;
use Admirly\Plugin;

/**
 * Settings → Admirly (tabs: General, Fields, Tools).
 */
final class Settings {
	public const PAGE  = 'admirly';
	public const GROUP = 'admirly_settings_group';
	public const TABS  = [ 'general', 'fields', 'tools' ];

	/** Defaults; extensions add their own keys through `admirly_default_settings`. @return array<string,mixed> */
	public static function defaults(): array {
		$defaults = [
			'color'               => '#4F46E5',
			'privacy_page_id'     => (int) get_option( 'wp_page_for_privacy_policy' ),
			'wall_page_id'        => 0,
			'form_page_id'        => 0,
			'thanks_text'         => __( 'Thank you! Your review has been received and will appear once approved.', 'admirly' ),
			'form_title'          => __( 'Share your experience', 'admirly' ),
			'language_mode'       => 'all',
			'delete_on_uninstall' => false,
			'preset'              => '',
			'fields'              => FieldConfig::DEFAULTS,
		];
		/** @param array<string,mixed> $defaults */
		return (array) apply_filters( 'admirly_default_settings', $defaults );
	}

	/** Current options merged over defaults. @return array<string,mixed> */
	public static function all(): array {
		$opts = get_option( Plugin::OPTION, [] );
		return array_merge( self::defaults(), is_array( $opts ) ? $opts : [] );
	}

	public function register(): void {
		add_action( 'admin_init', [ $this, 'registerSettings' ] );
		add_action( 'admin_menu', [ $this, 'addPage' ] );
	}

	public function registerSettings(): void {
		register_setting(
			self::GROUP,
			Plugin::OPTION,
			[
				'type'              => 'array',
				'sanitize_callback' => [ $this, 'sanitize' ],
				'default'           => [],
			]
		);
	}

	/**
	 * Settings form posts carry a `_tab` key: only that tab's keys change, everything else is preserved.
	 * Programmatic updates (wizard, presets) have no `_tab` and are taken as a whole.
	 * Extensions sanitize their own keys through `admirly_sanitize_settings`.
	 *
	 * @param mixed $in @return array<string,mixed>
	 */
	public function sanitize( $in ): array {
		$in  = is_array( $in ) ? $in : [];
		$cur = self::all();
		$out = $cur;
		$tab = isset( $in['_tab'] ) ? sanitize_key( (string) $in['_tab'] ) : '';

		if ( $tab === '' ) {
			$color                      = sanitize_hex_color( (string) ( $in['color'] ?? $cur['color'] ) );
			$out['color']               = $color ? $color : $cur['color'];
			$out['privacy_page_id']     = max( 0, (int) ( $in['privacy_page_id'] ?? $cur['privacy_page_id'] ) );
			$out['wall_page_id']        = max( 0, (int) ( $in['wall_page_id'] ?? $cur['wall_page_id'] ) );
			$out['form_page_id']        = max( 0, (int) ( $in['form_page_id'] ?? $cur['form_page_id'] ) );
			$out['thanks_text']         = sanitize_textarea_field( (string) ( $in['thanks_text'] ?? $cur['thanks_text'] ) );
			$out['form_title']          = sanitize_text_field( (string) ( $in['form_title'] ?? $cur['form_title'] ) );
			$out['language_mode']       = ( $in['language_mode'] ?? $cur['language_mode'] ) === 'current' ? 'current' : 'all';
			$out['delete_on_uninstall'] = ! empty( $in['delete_on_uninstall'] ?? $cur['delete_on_uninstall'] );
			$out['preset']              = sanitize_key( (string) ( $in['preset'] ?? $cur['preset'] ) );
			$out['fields']              = FieldConfig::normalize( (array) ( $in['fields'] ?? $cur['fields'] ) );
		} elseif ( $tab === 'general' ) {
			$color                  = sanitize_hex_color( (string) ( $in['color'] ?? '' ) );
			$out['color']           = $color ? $color : self::defaults()['color'];
			$out['privacy_page_id'] = max( 0, (int) ( $in['privacy_page_id'] ?? 0 ) );
			$out['wall_page_id']    = max( 0, (int) ( $in['wall_page_id'] ?? 0 ) );
			$out['form_page_id']    = max( 0, (int) ( $in['form_page_id'] ?? 0 ) );
			$out['thanks_text']     = sanitize_textarea_field( (string) ( $in['thanks_text'] ?? '' ) );
			$out['form_title']      = sanitize_text_field( (string) ( $in['form_title'] ?? '' ) );
			$out['language_mode']   = ( $in['language_mode'] ?? 'all' ) === 'current' ? 'current' : 'all';
		} elseif ( $tab === 'fields' ) {
			$f      = FieldConfig::normalize( (array) $cur['fields'] );
			$preset = sanitize_key( (string) ( $in['apply_preset'] ?? '' ) );
			if ( $preset !== '' && Plugin::preset( $preset ) ) {
				$p                  = Plugin::preset( $preset );
				$out['fields']      = $p['fields'];
				$out['preset']      = $preset;
				$out['form_title']  = $p['form_title'];
				$out['thanks_text'] = $p['thanks_text'];
				return $out;
			}
			$out['fields'] = FieldConfig::normalize(
				[
					'roles' => FieldConfig::parseList( (string) ( $in['roles_text'] ?? '' ), $f['roles'] ),
					'sub'   => [
						'enabled'  => ! empty( $in['sub_enabled'] ),
						'label'    => sanitize_text_field( (string) ( $in['sub_label'] ?? '' ) ),
						'options'  => FieldConfig::parseList( (string) ( $in['sub_options_text'] ?? '' ), $f['sub']['options'] ),
						'roles'    => array_map( 'sanitize_key', (array) ( $in['sub_roles'] ?? [] ) ),
						'required' => ! empty( $in['sub_required'] ),
					],
				]
			);
		} elseif ( $tab === 'tools' ) {
			$out['delete_on_uninstall'] = ! empty( $in['delete_on_uninstall'] );
		}
		/** @param array<string,mixed> $out Sanitized options so far. @param array<string,mixed> $in Raw input. @param array<string,mixed> $cur Current options. @param string $tab Settings tab ('' = whole option). */
		return (array) apply_filters( 'admirly_sanitize_settings', $out, $in, $cur, $tab );
	}

	public function addPage(): void {
		add_options_page( 'Admirly', 'Admirly', 'manage_options', self::PAGE, [ $this, 'render' ] );
	}

	public function render(): void {
		if ( ! current_user_can( 'manage_options' ) ) {
			return;
		}
		$tab = sanitize_key( (string) ( $_GET['tab'] ?? 'general' ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only tab switch
		if ( ! in_array( $tab, self::TABS, true ) ) {
			$tab = 'general';
		}
		Shortcodes::display(
			'admin/settings',
			[
				'tab'  => $tab,
				'opts' => self::all(),
				'name' => Plugin::OPTION,
			]
		);
	}

	public static function url( string $tab = 'general' ): string {
		return admin_url( 'options-general.php?page=' . self::PAGE . '&tab=' . $tab );
	}
}