<?php
/**
 * Settings registration, sanitization, and handling.
 *
 * @package ContentCortex
 */

defined( 'ABSPATH' ) || exit;

/**
 * Class OCAP_Settings
 */
class OCAP_Settings {

	/**
	 * Setting option name.
	 */
	const OPTION_NAME = 'ocap_settings';

	/**
	 * Setting group name.
	 */
	const OPTION_GROUP = 'ocap_settings_group';

	/**
	 * Initialize hooks.
	 */
	public function init() {
		add_action( 'admin_init', array( $this, 'register_settings' ) );
	}

	/**
	 * Register settings using the WordPress Settings API.
	 */
	public function register_settings() {
		register_setting(
			self::OPTION_GROUP,
			self::OPTION_NAME,
			array(
				'type'              => 'array',
				'sanitize_callback' => array( $this, 'sanitize_settings' ),
				'default'           => ocap_get_default_settings(),
			)
		);
	}

	/**
	 * Sanitize and validate all settings inputs.
	 *
	 * @param array $input Raw form input.
	 * @return array Sanitized settings.
	 */
	public function sanitize_settings( $input ) {
		if ( ! is_array( $input ) ) {
			return ocap_get_default_settings();
		}

		$current = ocap_get_settings();
		$output  = $current;

		// 1. Post types tab.
		if ( isset( $input['post_types'] ) && is_array( $input['post_types'] ) ) {
			$registered_types = get_post_types( array( 'public' => true ), 'names' );
			unset( $registered_types['attachment'] );

			$sanitized_types = array();
			foreach ( $registered_types as $pt ) {
				$enabled = ! empty( $input['post_types'][ $pt ]['enabled'] ) ? 1 : 0;
				$days    = isset( $input['post_types'][ $pt ]['days'] ) ? absint( $input['post_types'][ $pt ]['days'] ) : 90;

				if ( $days < 1 ) {
					$days = 90;
				} elseif ( $days > 3650 ) {
					$days = 3650;
				}

				$sanitized_types[ $pt ] = array(
					'enabled' => $enabled,
					'days'    => $days,
				);
			}
			$output['post_types'] = $sanitized_types;
		}

		// Date basis.
		if ( isset( $input['date_basis'] ) ) {
			$output['date_basis'] = ( 'published' === $input['date_basis'] ) ? 'published' : 'modified';
		}

		// Show list column.
		if ( isset( $input['_has_post_types_tab'] ) ) {
			$output['show_list_column'] = ! empty( $input['show_list_column'] ) ? 1 : 0;
		}

		// 2. Exclusions tab.
		if ( isset( $input['_has_exclusions_tab'] ) ) {
			if ( ! empty( $input['excluded_terms'] ) && is_array( $input['excluded_terms'] ) ) {
				$output['excluded_terms'] = array_filter( array_map( 'absint', $input['excluded_terms'] ) );
			} else {
				$output['excluded_terms'] = array();
			}

			// Delete on uninstall checkbox.
			$output['delete_on_uninstall'] = ! empty( $input['delete_on_uninstall'] ) ? 1 : 0;
		}

		// 3. Email digest tab.
		if ( isset( $input['_has_email_tab'] ) ) {
			$email_input = isset( $input['email'] ) && is_array( $input['email'] ) ? $input['email'] : array();
			$email_cfg   = isset( $current['email'] ) ? $current['email'] : array();

			// Enabled.
			$email_cfg['enabled'] = ! empty( $email_input['enabled'] ) ? 1 : 0;

			// Recipients.
			if ( isset( $email_input['recipients'] ) ) {
				if ( is_string( $email_input['recipients'] ) ) {
					$raw_list = explode( ',', $email_input['recipients'] );
				} elseif ( is_array( $email_input['recipients'] ) ) {
					$raw_list = $email_input['recipients'];
				} else {
					$raw_list = array();
				}

				$valid_emails = array();
				foreach ( $raw_list as $email ) {
					$clean = sanitize_email( trim( $email ) );
					if ( is_email( $clean ) ) {
						$valid_emails[] = $clean;
					}
				}

				if ( empty( $valid_emails ) ) {
					$valid_emails = array( get_option( 'admin_email' ) );
				}

				$email_cfg['recipients'] = array_values( array_unique( $valid_emails ) );
			}

			// Frequency.
			if ( isset( $email_input['frequency'] ) && in_array( $email_input['frequency'], array( 'weekly', 'monthly', 'quarterly' ), true ) ) {
				$email_cfg['frequency'] = $email_input['frequency'];
			}

			// Send day.
			if ( isset( $email_input['send_day'] ) ) {
				$day = absint( $email_input['send_day'] );
				if ( 'weekly' === $email_cfg['frequency'] ) {
					$email_cfg['send_day'] = max( 1, min( 7, $day ) );
				} else {
					$email_cfg['send_day'] = max( 1, min( 28, $day ) );
				}
			}

			// Send time (HH:MM).
			if ( ! empty( $email_input['send_time'] ) && preg_match( '/^([01][0-9]|2[0-3]):[0-5][0-9]$/', trim( $email_input['send_time'] ) ) ) {
				$email_cfg['send_time'] = trim( $email_input['send_time'] );
			}

			// Max items.
			if ( isset( $email_input['max_items'] ) ) {
				$max_items = absint( $email_input['max_items'] );
				$email_cfg['max_items'] = max( 1, min( 500, $max_items ) );
			}

			// Subject.
			if ( isset( $email_input['subject'] ) ) {
				$email_cfg['subject'] = sanitize_text_field( $email_input['subject'] );
			}

			// Heading.
			if ( isset( $email_input['heading'] ) ) {
				$email_cfg['heading'] = sanitize_text_field( $email_input['heading'] );
			}

			// Intro.
			if ( isset( $email_input['intro'] ) ) {
				$email_cfg['intro'] = wp_kses_post( $email_input['intro'] );
			}

			// Footer.
			if ( isset( $email_input['footer'] ) ) {
				$email_cfg['footer'] = wp_kses_post( $email_input['footer'] );
			}

			// Logo ID.
			if ( isset( $email_input['logo_id'] ) ) {
				$email_cfg['logo_id'] = absint( $email_input['logo_id'] );
			}

			// Brand color.
			if ( ! empty( $email_input['brand_color'] ) ) {
				$clean_hex = sanitize_hex_color( $email_input['brand_color'] );
				if ( $clean_hex ) {
					$email_cfg['brand_color'] = $clean_hex;
				}
			}

			// Button text.
			if ( isset( $email_input['button_text'] ) ) {
				$email_cfg['button_text'] = sanitize_text_field( $email_input['button_text'] );
			}

			// Show columns.
			$allowed_cols = array( 'type', 'days', 'author' );
			if ( isset( $email_input['show_columns'] ) && is_array( $email_input['show_columns'] ) ) {
				$email_cfg['show_columns'] = array_values( array_intersect( $email_input['show_columns'], $allowed_cols ) );
			} else {
				$email_cfg['show_columns'] = array();
			}

			// Only if stale.
			$email_cfg['only_if_stale'] = ! empty( $email_input['only_if_stale'] ) ? 1 : 0;

			$output['email'] = $email_cfg;

			// Reschedule cron event.
			if ( class_exists( 'OCAP_Email' ) ) {
				$email_service = new OCAP_Email();
				if ( ! empty( $email_cfg['enabled'] ) ) {
					$email_service->schedule_next_event();
				} else {
					$email_service->clear_scheduled_event();
				}
			}
		}

		// Clear transient stale cache.
		ocap_clear_stale_cache();

		return $output;
	}
}