<?php
/**
 * Settings storage, defaults and sanitizing.
 *
 * Each group is one option: rentbaik_settings_{group}.
 *
 * @package Rentbaik
 */

namespace Rentbaik;

use Rentbaik\Support\Currencies;
use Rentbaik\Support\Format;

defined( 'ABSPATH' ) || exit;

/**
 * Typed access to the plugin settings.
 */
final class Settings {

	/**
	 * Settings groups (one option each).
	 */
	public const GROUPS = array( 'general', 'format', 'rules', 'payments', 'display', 'notifications', 'advanced' );

	/**
	 * Vehicle types the shop can rent out.
	 */
	public const VEHICLE_TYPES = array( 'motorcycle', 'car', 'bicycle', 'ebike' );

	/**
	 * Option name for a group.
	 *
	 * @param string $group Group key.
	 * @return string
	 */
	public static function option_name( string $group ): string {
		return 'rentbaik_settings_' . $group;
	}

	/**
	 * Field schema per group: type, default and allowed values.
	 *
	 * @return array<string, array<string, array<string, mixed>>>
	 */
	public static function schema(): array {
		$currency = self::default_currency();

		return array(
			'general'       => array(
				'business_name'     => array(
					'type'    => 'text',
					'default' => get_bloginfo( 'name' ),
				),
				'business_email'    => array(
					'type'    => 'email',
					'default' => get_option( 'admin_email' ),
				),
				'business_phone'    => array(
					'type'    => 'text',
					'default' => '',
				),
				'whatsapp_number'   => array(
					'type'    => 'phone',
					'default' => '',
				),
				'vehicle_types'     => array(
					'type'    => 'multicheck',
					'default' => array( 'motorcycle', 'car' ),
					'choices' => self::VEHICLE_TYPES,
				),
				'default_rate_unit' => array(
					'type'    => 'select',
					'default' => 'day',
					'choices' => array( 'hour', 'day' ),
				),
			),
			'format'        => array(
				'currency'           => array(
					'type'    => 'select',
					'default' => $currency,
					'choices' => array_keys( Currencies::all() ),
				),
				'currency_position'  => array(
					'type'    => 'select',
					'default' => 'left',
					'choices' => array( 'left', 'right', 'left_space', 'right_space' ),
				),
				'thousand_separator' => array(
					'type'    => 'separator',
					'default' => ',',
				),
				'decimal_separator'  => array(
					'type'    => 'separator',
					'default' => '.',
				),
				'decimals'           => array(
					'type'    => 'int',
					'default' => Currencies::get( $currency )['decimals'],
					'min'     => 0,
					'max'     => 4,
				),
				'time_format'        => array(
					'type'    => 'select',
					'default' => 'site',
					'choices' => array( 'site', '24', '12' ),
				),
				'week_start'         => array(
					'type'    => 'select',
					'default' => 'site',
					'choices' => array( 'site', '0', '1', '2', '3', '4', '5', '6' ),
				),
				'distance_unit'      => array(
					'type'    => 'select',
					'default' => 'km',
					'choices' => array( 'km', 'mi' ),
				),
				'fuel_unit'          => array(
					'type'    => 'select',
					'default' => 'l',
					'choices' => array( 'l', 'gal' ),
				),
			),
			'rules'         => array(
				'day_mode'        => array(
					'type'    => 'select',
					'default' => '24h',
					'choices' => array( '24h', 'calendar' ),
				),
				'grace_minutes'   => array(
					'type'    => 'int',
					'default' => 60,
					'min'     => 0,
					'max'     => 240,
				),
				'min_hours'       => array(
					'type'    => 'int',
					'default' => 1,
					'min'     => 1,
					'max'     => 720,
				),
				'max_days'        => array(
					'type'    => 'int',
					'default' => 0,
					'min'     => 0,
					'max'     => 365,
				),
				'buffer_minutes'  => array(
					'type'    => 'int',
					'default' => 0,
					'min'     => 0,
					'max'     => 1440,
				),
				'tax_mode'        => array(
					'type'    => 'select',
					'default' => 'none',
					'choices' => array( 'none', 'exclusive', 'inclusive' ),
				),
				'tax_rate'        => array(
					'type'    => 'decimal',
					'default' => 0,
					'min'     => 0,
					'max'     => 100,
				),
				'deposit_mode'    => array(
					'type'    => 'select',
					'default' => 'fixed',
					'choices' => array( 'fixed', 'percent' ),
				),
				'default_deposit' => array(
					'type'    => 'money',
					'default' => 0,
				),
				'deposit_percent' => array(
					'type'    => 'decimal',
					'default' => 0,
					'min'     => 0,
					'max'     => 100,
				),
			),
			'payments'      => array(
				'methods'        => array(
					'type'    => 'multicheck',
					'default' => array( 'pay_at_pickup' ),
					'choices' => array( 'pay_at_pickup', 'bank_transfer', 'qris', 'woocommerce' ),
				),
				'bank_details'   => array(
					'type'    => 'textarea',
					'default' => '',
				),
				'qris_image'     => array(
					'type'    => 'media',
					'default' => 0,
				),
				'instructions'   => array(
					'type'    => 'textarea',
					'default' => '',
				),
				'online_confirm' => array(
					'type'    => 'checkbox',
					'default' => true,
				),
			),
			'display'       => array(
				'style_mode'    => array(
					'type'    => 'select',
					'default' => 'rentbaik',
					'choices' => array( 'rentbaik', 'minimal', 'theme' ),
				),
				'primary_color' => array(
					'type'    => 'color',
					'default' => '#1f6feb',
				),
				'border_radius' => array(
					'type'    => 'int',
					'default' => 8,
					'min'     => 0,
					'max'     => 32,
				),
			),
			'notifications' => array(
				'admin_recipients' => array(
					'type'    => 'emails',
					'default' => get_option( 'admin_email' ),
				),
				'from_name'        => array(
					'type'    => 'text',
					'default' => get_bloginfo( 'name' ),
				),
				'from_email'       => array(
					'type'    => 'email',
					'default' => get_option( 'admin_email' ),
				),
				'whatsapp_booking' => array(
					'type'    => 'checkbox',
					'default' => true,
				),
				'email_admin_new'  => array(
					'type'    => 'checkbox',
					'default' => true,
				),
				'email_received'   => array(
					'type'    => 'checkbox',
					'default' => true,
				),
				'email_confirmed'  => array(
					'type'    => 'checkbox',
					'default' => true,
				),
				'email_pickup'     => array(
					'type'    => 'checkbox',
					'default' => true,
				),
				'email_return'     => array(
					'type'    => 'checkbox',
					'default' => true,
				),
				'email_thanks'     => array(
					'type'    => 'checkbox',
					'default' => true,
				),
				'reminder_hours'   => array(
					'type'    => 'int',
					'default' => 24,
					'min'     => 1,
					'max'     => 72,
				),
			),
			'advanced'      => array(
				'booking_prefix' => array(
					'type'    => 'slug',
					'default' => 'RB-',
				),
				'hold_minutes'   => array(
					'type'    => 'int',
					'default' => 15,
					'min'     => 5,
					'max'     => 120,
				),
				'delete_data'    => array(
					'type'    => 'checkbox',
					'default' => false,
				),
			),
		);
	}

	/**
	 * Store currency guess for a new install: WooCommerce currency when available, else USD.
	 *
	 * @return string
	 */
	public static function default_currency(): string {
		$woo = strtoupper( (string) get_option( 'woocommerce_currency', '' ) );
		return ( '' !== $woo && Currencies::exists( $woo ) ) ? $woo : 'USD';
	}

	/**
	 * Default values for a group.
	 *
	 * @param string $group Group key.
	 * @return array<string, mixed>
	 */
	public static function defaults( string $group ): array {
		$schema   = self::schema();
		$defaults = array();
		foreach ( $schema[ $group ] ?? array() as $key => $field ) {
			$defaults[ $key ] = $field['default'];
		}
		return $defaults;
	}

	/**
	 * All values of a group merged with defaults.
	 *
	 * @param string $group Group key.
	 * @return array<string, mixed>
	 */
	public static function group( string $group ): array {
		$saved = get_option( self::option_name( $group ), array() );
		return array_merge( self::defaults( $group ), is_array( $saved ) ? $saved : array() );
	}

	/**
	 * One setting value.
	 *
	 * @param string $group Group key.
	 * @param string $key   Field key.
	 * @return mixed
	 */
	public static function get( string $group, string $key ) {
		$values = self::group( $group );
		return $values[ $key ] ?? null;
	}

	/**
	 * Save defaults for groups that were never saved (activation).
	 *
	 * @return void
	 */
	public static function add_defaults(): void {
		foreach ( self::GROUPS as $group ) {
			if ( false === get_option( self::option_name( $group ), false ) ) {
				add_option( self::option_name( $group ), self::defaults( $group ), '', false );
			}
		}
	}

	/**
	 * Sanitize a submitted group against its schema.
	 *
	 * @param string $group Group key.
	 * @param mixed  $input Raw submitted values.
	 * @return array<string, mixed>
	 */
	public static function sanitize( string $group, $input ): array {
		$schema = self::schema()[ $group ] ?? array();
		$input  = is_array( $input ) ? $input : array();
		$clean  = array();

		foreach ( $schema as $key => $field ) {
			$raw = $input[ $key ] ?? null;
			if ( 'secret' === $field['type'] ) {
				$clean[ $key ] = self::sanitize_secret( $group, $key, $field, $raw, ! empty( $input[ $key . '_remove' ] ) );
				continue;
			}
			$clean[ $key ] = self::sanitize_field( $field, $raw );
		}

		if ( 'format' === $group ) {
			$clean = self::follow_currency_decimals( $clean );
		}

		return $clean;
	}

	/**
	 * Secret values (API keys) are never printed back into the form: an empty field keeps the saved value.
	 *
	 * @param string               $group  Group key.
	 * @param string               $key    Field key.
	 * @param array<string, mixed> $field  Field schema.
	 * @param mixed                $raw    Submitted value.
	 * @param bool                 $remove Whether "remove" was ticked.
	 * @return string
	 */
	private static function sanitize_secret( string $group, string $key, array $field, $raw, bool $remove ): string {
		if ( $remove ) {
			return '';
		}
		$saved = (string) self::get( $group, $key );
		$value = trim( sanitize_text_field( (string) $raw ) );
		if ( '' === $value ) {
			return $saved;
		}
		if ( ! empty( $field['pattern'] ) && ! preg_match( $field['pattern'], $value ) ) {
			if ( function_exists( 'add_settings_error' ) ) {
				add_settings_error( self::option_name( $group ), 'rentbaik_' . $key, __( 'The key you entered does not look right, so the previous value was kept.', 'rentbaik' ) );
			}
			return $saved;
		}
		return $value;
	}

	/**
	 * When the currency changes and the decimals were left at the old currency's default,
	 * switch to the new currency's default (e.g. USD 2 → IDR 0).
	 *
	 * @param array<string, mixed> $clean Sanitized format values.
	 * @return array<string, mixed>
	 */
	private static function follow_currency_decimals( array $clean ): array {
		$previous    = self::group( 'format' );
		$old_default = Currencies::get( (string) $previous['currency'] )['decimals'];
		if ( $previous['currency'] !== $clean['currency'] && $old_default === (int) $clean['decimals'] ) {
			$clean['decimals'] = Currencies::get( (string) $clean['currency'] )['decimals'];
		}
		return $clean;
	}

	/**
	 * Sanitize one value by field type.
	 *
	 * @param array<string, mixed> $field Field schema.
	 * @param mixed                $raw   Raw value (already unslashed by the Settings API).
	 * @return mixed
	 */
	private static function sanitize_field( array $field, $raw ) {
		switch ( $field['type'] ) {
			case 'checkbox':
				return ! empty( $raw );

			case 'email':
				$email = sanitize_email( (string) $raw );
				return is_email( $email ) ? $email : $field['default'];

			case 'emails':
				$emails = array_filter( array_map( 'sanitize_email', explode( ',', (string) $raw ) ), 'is_email' );
				return implode( ', ', $emails );

			case 'phone':
				// Keep digits only, international format without "+" (e.g. 6281234567890).
				return preg_replace( '/\D+/', '', (string) $raw );

			case 'int':
				$value = (int) $raw;
				return max( (int) $field['min'], min( (int) $field['max'], $value ) );

			case 'select':
				$value = (string) $raw;
				return in_array( $value, $field['choices'], true ) ? $value : $field['default'];

			case 'multicheck':
				$values = array_map( 'sanitize_key', (array) $raw );
				return array_values( array_intersect( $field['choices'], $values ) );

			case 'color':
				$color = sanitize_hex_color( (string) $raw );
				return $color ? $color : $field['default'];

			case 'separator':
				// One or two characters; a single space is allowed.
				$value = substr( wp_strip_all_tags( (string) $raw ), 0, 2 );
				return ( '' === $value || preg_match( '/[0-9]/', $value ) ) ? $field['default'] : $value;

			case 'textarea':
				return sanitize_textarea_field( (string) $raw );

			case 'decimal':
				$value = (float) str_replace( ',', '.', (string) $raw );
				return round( max( (float) $field['min'], min( (float) $field['max'], $value ) ), 2 );

			case 'money':
				return max( 0, Format::to_minor( (string) $raw ) );

			case 'media':
				$id = absint( $raw );
				return ( $id && wp_attachment_is_image( $id ) ) ? $id : 0;

			case 'slug':
				return strtoupper( substr( preg_replace( '/[^A-Za-z0-9\-_]/', '', (string) $raw ), 0, 10 ) );

			default:
				return sanitize_text_field( (string) $raw );
		}
	}
}