<?php
/**
 * Payment methods library.
 *
 * @package AfriDirect_Payment
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Payment methods class.
 */
class AfriDirect_Payment_Methods {

	/**
	 * Get all payment methods.
	 *
	 * @return array
	 */
	public static function get_all() {
		$methods = get_option( 'afridirect_payment_methods', array() );
		return is_array( $methods ) ? $methods : array();
	}

	/**
	 * Get a single payment method.
	 *
	 * @param string $method_id Method ID.
	 * @return array|false
	 */
	public static function get( $method_id ) {
		$methods = self::get_all();
		return isset( $methods[ $method_id ] ) ? $methods[ $method_id ] : false;
	}

	/**
	 * Save payment method.
	 *
	 * @param array $method Method data.
	 * @return bool
	 */
	public static function save( $method ) {
		// Auto-generate ID if missing.
		if ( empty( $method['id'] ) ) {
			$label = isset( $method['label'] ) ? $method['label'] : '';
			if ( empty( $label ) ) {
				return false;
			}
			$method['id'] = sanitize_key( sanitize_title( $label ) . '-' . time() );
		}

		$methods = self::get_all();
		$methods[ $method['id'] ] = self::sanitize_method( $method );
		return update_option( 'afridirect_payment_methods', $methods );
	}

	/**
	 * Delete payment method.
	 *
	 * @param string $method_id Method ID.
	 * @return bool
	 */
	public static function delete( $method_id ) {
		$methods = self::get_all();
		if ( ! isset( $methods[ $method_id ] ) ) {
			return false;
		}

		unset( $methods[ $method_id ] );
		return update_option( 'afridirect_payment_methods', $methods );
	}

	/**
	 * Sanitize method data.
	 *
	 * @param array $method Method data.
	 * @return array
	 */
	private static function sanitize_method( $method ) {
		$sanitized = array(
			'id'          => sanitize_key( $method['id'] ),
			'label'       => sanitize_text_field( $method['label'] ),
			'type'        => sanitize_key( $method['type'] ),
			'fields'      => array(),
			'instructions' => wp_kses_post( $method['instructions'] ?? '' ),
			'qr_attachment_id' => isset( $method['qr_attachment_id'] ) ? absint( $method['qr_attachment_id'] ) : 0,
			'copy_fields' => isset( $method['copy_fields'] ) && is_array( $method['copy_fields'] ) ? array_map( 'sanitize_key', $method['copy_fields'] ) : array(),
		);

		// Sanitize fields based on type.
		if ( isset( $method['fields'] ) && is_array( $method['fields'] ) ) {
			$sanitized['fields'] = self::sanitize_fields( $method['type'], $method['fields'] );
		}

		return $sanitized;
	}

	/**
	 * Sanitize fields based on type.
	 *
	 * @param string $type Method type.
	 * @param array  $fields Fields data.
	 * @return array
	 */
	private static function sanitize_fields( $type, $fields ) {
		$sanitized = array();

		if ( 'custom' === $type ) {
			// Custom fields as key-value pairs.
			if ( is_array( $fields ) ) {
				foreach ( $fields as $key => $value ) {
					$sanitized[ sanitize_key( $key ) ] = sanitize_text_field( $value );
				}
			}
			return $sanitized;
		}

		$definitions = self::get_definitions();
		if ( ! isset( $definitions[ $type ] ) ) {
			return $sanitized;
		}

		foreach ( $definitions[ $type ]['fields'] as $key => $field ) {
			$value             = isset( $fields[ $key ] ) ? $fields[ $key ] : '';
			$sanitized[ $key ] = 'email' === $field['type'] ? sanitize_email( $value ) : sanitize_text_field( $value );
		}

		return $sanitized;
	}

	/**
	 * Payment method types and their fields.
	 *
	 * This is the single source of truth: the type list, the admin form, the
	 * sanitising and the labels shown to customers are all built from it.
	 *
	 * @return array Type => array( 'label' => string, 'fields' => array( key => array( 'label', 'type' ) ) ).
	 */
	public static function get_definitions() {
		return array(
			'bank'         => array(
				'label'  => __( 'Bank Transfer', 'afridirect-payment' ),
				'fields' => array(
					'bank_name'      => array(
						'label' => __( 'Bank Name', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'account_name'   => array(
						'label' => __( 'Account Name', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'account_number' => array(
						'label' => __( 'Account Number', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'sort_code'      => array(
						'label' => __( 'Sort Code', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'iban'           => array(
						'label' => __( 'IBAN', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'swift'          => array(
						'label' => __( 'SWIFT/BIC', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'routing_number' => array(
						'label' => __( 'Routing Number', 'afridirect-payment' ),
						'type'  => 'text',
					),
				),
			),
			'paypal'       => array(
				'label'  => __( 'PayPal', 'afridirect-payment' ),
				'fields' => array(
					'email' => array(
						'label' => __( 'PayPal Email', 'afridirect-payment' ),
						'type'  => 'email',
					),
				),
			),
			'zelle'        => array(
				'label'  => __( 'Zelle', 'afridirect-payment' ),
				'fields' => array(
					'email' => array(
						'label' => __( 'Email', 'afridirect-payment' ),
						'type'  => 'email',
					),
					'phone' => array(
						'label' => __( 'Phone Number', 'afridirect-payment' ),
						'type'  => 'text',
					),
				),
			),
			'venmo'        => array(
				'label'  => __( 'Venmo', 'afridirect-payment' ),
				'fields' => array(
					'username' => array(
						'label' => __( 'Venmo Username', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'phone'    => array(
						'label' => __( 'Phone Number', 'afridirect-payment' ),
						'type'  => 'text',
					),
				),
			),
			'cashapp'      => array(
				'label'  => __( 'Cash App', 'afridirect-payment' ),
				'fields' => array(
					'cashtag' => array(
						'label' => __( 'Cashtag', 'afridirect-payment' ),
						'type'  => 'text',
					),
				),
			),
			'wise'         => array(
				'label'  => __( 'Wise', 'afridirect-payment' ),
				'fields' => array(
					'email'        => array(
						'label' => __( 'Wise Email', 'afridirect-payment' ),
						'type'  => 'email',
					),
					'wisetag'      => array(
						'label' => __( 'Wisetag', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'account_name' => array(
						'label' => __( 'Account Name', 'afridirect-payment' ),
						'type'  => 'text',
					),
				),
			),
			'payoneer'     => array(
				'label'  => __( 'Payoneer', 'afridirect-payment' ),
				'fields' => array(
					'email'       => array(
						'label' => __( 'Payoneer Email', 'afridirect-payment' ),
						'type'  => 'email',
					),
					'payoneer_id' => array(
						'label' => __( 'Payoneer ID', 'afridirect-payment' ),
						'type'  => 'text',
					),
				),
			),
			'skrill'       => array(
				'label'  => __( 'Skrill', 'afridirect-payment' ),
				'fields' => array(
					'email' => array(
						'label' => __( 'Skrill Email', 'afridirect-payment' ),
						'type'  => 'email',
					),
				),
			),
			'mobile_money' => array(
				'label'  => __( 'Mobile Money', 'afridirect-payment' ),
				'fields' => array(
					'provider'     => array(
						'label' => __( 'Mobile Money Provider', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'phone_number' => array(
						'label' => __( 'Mobile Number', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'account_name' => array(
						'label' => __( 'Account Name', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'country'      => array(
						'label' => __( 'Country', 'afridirect-payment' ),
						'type'  => 'text',
					),
				),
			),
			'crypto'       => array(
				'label'  => __( 'Cryptocurrency', 'afridirect-payment' ),
				'fields' => array(
					'wallet_address' => array(
						'label' => __( 'Wallet Address', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'network'        => array(
						'label' => __( 'Network', 'afridirect-payment' ),
						'type'  => 'text',
					),
					'currency'       => array(
						'label' => __( 'Currency', 'afridirect-payment' ),
						'type'  => 'text',
					),
				),
			),
		);
	}

	/**
	 * Get method types.
	 *
	 * @return array Type => label.
	 */
	public static function get_types() {
		$types = array();
		foreach ( self::get_definitions() as $type => $definition ) {
			$types[ $type ] = $definition['label'];
		}
		$types['custom'] = __( 'Custom', 'afridirect-payment' );

		return $types;
	}

	/**
	 * Get field labels for a type.
	 *
	 * @param string $type Method type.
	 * @return array Field key => label.
	 */
	public static function get_field_labels( $type ) {
		$definitions = self::get_definitions();
		if ( ! isset( $definitions[ $type ] ) ) {
			return array();
		}

		$labels = array();
		foreach ( $definitions[ $type ]['fields'] as $key => $field ) {
			$labels[ $key ] = $field['label'];
		}

		return $labels;
	}
}