<?php

namespace PluginMagnet\AIStockPredictor\Admin;

defined( 'ABSPATH' ) || exit;

/**
 * Action class.
 *
 * @since 1.0.0
 * @package PluginMagnet\AIStockPredictor\Admin
 */
class Action {
	/**
	 * Constructor.
	 *
	 * @since 1.0.0
	 */
	public function __construct() {
		add_action( 'admin_init', array( $this, 'init_settings' ) );
		add_action( 'admin_post_save_aistpr_api_settings', array( $this, 'handle_api_settings_save' ) );
		add_action( 'admin_post_save_aistpr_notification_settings', array( $this, 'handle_notification_settings_save' ) );
		add_action( 'admin_post_save_aistpr_prediction_settings', array( $this, 'handle_prediction_settings_save' ) );
		add_action( 'admin_post_save_aistpr_general_settings', array( $this, 'handle_general_settings_save' ) );
		add_action( 'admin_notices', array( $this, 'display_settings_notices' ) );
	}

	/**
	 * Initialize settings.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function init_settings() {
		register_setting(
			'aistpr_api_settings',
			'aistpr_api_settings',
			array(
				'sanitize_callback' => array( $this, 'sanitize_settings' ),
				'default'           => array(
					'ai_provider'            => 'openai',
					'openai_api_key'         => '',
					'deepseek_api_key'       => '',
					'prediction_cache_hours' => '24',
					'enable_daily_email'     => 'yes',
					'email_recipients'       => get_option( 'admin_email' ),
				),
			)
		);

		register_setting(
			'aistpr_prediction_settings',
			'aistpr_prediction_settings',
			array(
				'sanitize_callback' => array( $this, 'sanitize_prediction_settings' ),
				'default'           => array(
					'model'                => 'linear',
					'confidence_threshold' => 80,
					'historical_data'      => '90',
				),
			)
		);

		register_setting(
			'aistpr_general_settings',
			'aistpr_general_settings',
			array(
				'sanitize_callback' => array( $this, 'sanitize_general_settings' ),
				'default'           => array(
					'enable'           => 0,
					'update_frequency' => 'daily',
					'threshold'        => 5,
				),
			)
		);

		register_setting(
			'aistpr_notification_settings',
			'aistpr_notification_settings',
			array(
				'sanitize_callback' => array( $this, 'sanitize_notification_settings' ),
				'default'           => array(
					'enable'    => 0,
					'email'     => get_option( 'admin_email' ),
					'types'     => array( 'low_stock', 'out_of_stock' ),
					'frequency' => 'daily',
				),
			)
		);
	}

	/**
	 * Handle API settings form submission.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function handle_api_settings_save() {
		if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['_wpnonce'] ) ), 'aistpr_api_settings' ) ) {
			wp_die( esc_html__( 'Invalid nonce. Please try again.', 'ai-stock-predictor' ) );
		}

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'You do not have sufficient permissions to access this page.', 'ai-stock-predictor' ) );
		}

		$input    = isset( $_POST['aistpr_api_settings'] ) ? wp_unslash( $_POST['aistpr_api_settings'] ) : array(); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		$settings = $this->sanitize_settings( $input );
		update_option( 'aistpr_api_settings', $settings );

		wp_safe_redirect(
			add_query_arg(
				array(
					'page'    => 'ai-stock-predictor-settings',
					'tab'     => 'api',
					'updated' => 'true',
				),
				admin_url( 'admin.php' )
			)
		);
		exit;
	}

	/**
	 * Handle notification settings form submission.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function handle_notification_settings_save() {
		// Verify nonce.
		if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['_wpnonce'] ) ), 'aistpr_notification_settings' ) ) {
			wp_die( esc_html__( 'Invalid nonce. Please try again.', 'ai-stock-predictor' ) );
		}

		// Check permissions.
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'You do not have sufficient permissions to access this page.', 'ai-stock-predictor' ) );
		}

		// Sanitize and save settings.
		$input    = isset( $_POST['aistpr_notification_settings'] ) ? wp_unslash( $_POST['aistpr_notification_settings'] ) : array(); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		$settings = $this->sanitize_notification_settings( $input );
		update_option( 'aistpr_notification_settings', $settings );

		// Redirect back to settings page with success message.
		wp_safe_redirect(
			add_query_arg(
				array(
					'page'    => 'ai-stock-predictor-settings',
					'tab'     => 'notification',
					'updated' => 'true',
				),
				admin_url( 'admin.php' )
			)
		);
		exit;
	}

	/**
	 * Handle prediction settings form submission.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function handle_prediction_settings_save() {
		if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['_wpnonce'] ) ), 'aistpr_prediction_settings' ) ) {
			wp_die( esc_html__( 'Invalid nonce. Please try again.', 'ai-stock-predictor' ) );
		}

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'You do not have sufficient permissions to access this page.', 'ai-stock-predictor' ) );
		}

		$input    = isset( $_POST['aistpr_prediction_settings'] ) ? wp_unslash( $_POST['aistpr_prediction_settings'] ) : array(); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		$settings = $this->sanitize_prediction_settings( $input );
		update_option( 'aistpr_prediction_settings', $settings );

		wp_safe_redirect(
			add_query_arg(
				array(
					'page'    => 'ai-stock-predictor-settings',
					'tab'     => 'prediction',
					'updated' => 'true',
				),
				admin_url( 'admin.php' )
			)
		);
		exit;
	}

	/**
	 * Handle general settings form submission.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function handle_general_settings_save() {
		if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['_wpnonce'] ) ), 'aistpr_general_settings' ) ) {
			wp_die( esc_html__( 'Invalid nonce. Please try again.', 'ai-stock-predictor' ) );
		}

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'You do not have sufficient permissions to access this page.', 'ai-stock-predictor' ) );
		}

		$input    = isset( $_POST['aistpr_general_settings'] ) ? wp_unslash( $_POST['aistpr_general_settings'] ) : array(); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
		$settings = $this->sanitize_general_settings( $input );
		update_option( 'aistpr_general_settings', $settings );

		wp_safe_redirect(
			add_query_arg(
				array(
					'page'    => 'ai-stock-predictor-settings',
					'tab'     => 'general',
					'updated' => 'true',
				),
				admin_url( 'admin.php' )
			)
		);
		exit;
	}

	/**
	 * Display admin notices for settings updates.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	public function display_settings_notices() {
		$screen = get_current_screen();

		if ( 'woocommerce_page_ai-stock-predictor-settings' !== $screen->id ) {
			return;
		}

		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Only checking GET parameter for display purposes, no action taken
		if ( isset( $_GET['updated'] ) && 'true' === sanitize_text_field( wp_unslash( $_GET['updated'] ) ) ) {
			?>
			<div class="notice notice-success is-dismissible">
				<p><?php esc_html_e( 'Settings saved successfully.', 'ai-stock-predictor' ); ?></p>
			</div>
			<?php
		}
	}

	/**
	 * Sanitize settings.
	 *
	 * @param array $input The settings array.
	 * @return array
	 */
	public function sanitize_settings( $input ) {
		$sanitized = array();

		$sanitized['ai_provider'] = isset( $input['ai_provider'] )
			? sanitize_text_field( $input['ai_provider'] )
			: 'openai';

		$sanitized['openai_api_key'] = isset( $input['openai_api_key'] )
			? sanitize_text_field( $input['openai_api_key'] )
			: '';

		$sanitized['deepseek_api_key'] = isset( $input['deepseek_api_key'] )
			? sanitize_text_field( $input['deepseek_api_key'] )
			: '';

		$sanitized['prediction_cache_hours'] = isset( $input['prediction_cache_hours'] )
			? absint( $input['prediction_cache_hours'] )
			: 24;

		$sanitized['prediction_cache_hours'] = min( 72, max( 1, $sanitized['prediction_cache_hours'] ) );

		$sanitized['enable_daily_email'] = isset( $input['enable_daily_email'] ) && 'yes' === $input['enable_daily_email']
			? 'yes'
			: 'no';

		$sanitized['email_recipients'] = isset( $input['email_recipients'] )
			? sanitize_text_field( $input['email_recipients'] )
			: get_option( 'admin_email' );

		return $sanitized;
	}

	/**
	 * Sanitize notification settings.
	 *
	 * @param array $input The settings array.
	 * @return array
	 */
	public function sanitize_notification_settings( $input ) {
		$sanitized = array();

		$sanitized['enable'] = isset( $input['enable'] ) && 1 === absint( $input['enable'] ) ? 1 : 0;

		$sanitized['email'] = isset( $input['email'] )
			? sanitize_email( $input['email'] )
			: get_option( 'admin_email' );

		$sanitized['types'] = isset( $input['types'] ) && is_array( $input['types'] )
			? array_map( 'sanitize_text_field', $input['types'] )
			: array();

		$allowed_frequencies    = array( 'immediately', 'daily', 'weekly' );
		$sanitized['frequency'] = isset( $input['frequency'] ) && in_array( $input['frequency'], $allowed_frequencies, true )
			? $input['frequency']
			: 'daily';

		return $sanitized;
	}

	/**
	 * Sanitize prediction settings.
	 *
	 * @param array $input The settings array.
	 * @return array
	 */
	public function sanitize_prediction_settings( $input ) {
		$sanitized      = array();
		$allowed_models = array( 'linear', 'exponential', 'neural' );

		$sanitized['model'] = isset( $input['model'] ) && in_array( $input['model'], $allowed_models, true )
			? $input['model']
			: 'linear';

		$sanitized['confidence_threshold'] = isset( $input['confidence_threshold'] )
			? min( 100, max( 1, absint( $input['confidence_threshold'] ) ) )
			: 80;

		$sanitized['historical_data'] = isset( $input['historical_data'] )
			? sanitize_text_field( $input['historical_data'] )
			: '90';

		return $sanitized;
	}

	/**
	 * Sanitize general settings.
	 *
	 * @param array $input The settings array.
	 * @return array
	 */
	public function sanitize_general_settings( $input ) {
		$sanitized = array();

		$sanitized['enable'] = isset( $input['enable'] ) && 1 === absint( $input['enable'] ) ? 1 : 0;

		$allowed_frequencies    = array( 'hourly', 'twicedaily', 'daily', 'weekly' );
		$sanitized['update_frequency'] = isset( $input['update_frequency'] ) && in_array( $input['update_frequency'], $allowed_frequencies, true )
			? $input['update_frequency']
			: 'daily';

		$sanitized['threshold'] = isset( $input['threshold'] )
			? max( 1, absint( $input['threshold'] ) )
			: 5;

		return $sanitized;
	}
}