<?php
/**
 * Tracker Handler
 *
 * Handles tracking of popup views and conversions.
 *
 * @since      1.0.0
 * @package    Acumenpopup
 * @subpackage Acumenpopup/includes/Core
 */

namespace Acumenpopup\Core;

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class Tracker
 *
 * Manages tracking operations (Singleton).
 *
 * @since   1.0.0
 * @package Acumenpopup
 */
class Tracker {

	/**
	 * The single instance of the class.
	 *
	 * @since  1.0.0
	 * @access private
	 * @var    Tracker|null
	 */
	private static $instance = null;

	/**
	 * Private constructor to prevent direct instantiation.
	 *
	 * @since  1.0.0
	 * @access private
	 */
	private function __construct() {
		$this->init_hooks();
	}

	/**
	 * Get the single instance of the Tracker class.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return Tracker The single instance.
	 */
	public static function get_instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Initialize WordPress hooks.
	 *
	 * @since  1.0.0
	 * @access private
	 *
	 * @return void
	 */
	private function init_hooks() {
		add_action( 'wp_ajax_acumenpopup_track_view', array( $this, 'track_view' ) );
		add_action( 'wp_ajax_nopriv_acumenpopup_track_view', array( $this, 'track_view' ) );
		
		add_action( 'wp_ajax_acumenpopup_track_conversion', array( $this, 'track_conversion' ) );
		add_action( 'wp_ajax_nopriv_acumenpopup_track_conversion', array( $this, 'track_conversion' ) );

		add_action( 'wp_ajax_acumenpopup_get_analytics', array( $this, 'get_analytics_data' ) );
	}

	/**
	 * Track popup view.
	 *
	 * Increments the view count for a popup.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function track_view() {
		check_ajax_referer( 'acumenpopup_tracker', 'nonce' );

		$popup_id_raw = isset( $_POST['popup_id'] ) ? sanitize_text_field( wp_unslash( $_POST['popup_id'] ) ) : '';

		if ( empty( $popup_id_raw ) ) {
			wp_send_json_error( array( 'message' => 'Invalid popup ID' ) );
		}

		// Try to find post by acumenpopup_popup_id meta.
		$args = array(
			'post_type'      => 'acumen_popup_cmpgn',
			'meta_key'       => 'acumenpopup_popup_id', // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
			'meta_value'     => $popup_id_raw, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_value
			'fields'         => 'ids',
			'numberposts'    => 1,
			'post_status'    => 'any',
		);

		$posts = get_posts( $args );
		$post_id = ! empty( $posts ) ? $posts[0] : 0;

		// Fallback: Check if raw ID is already a numeric post ID.
		if ( ! $post_id && is_numeric( $popup_id_raw ) ) {
			$post_id = absint( $popup_id_raw );
		}

		if ( ! $post_id ) {
			wp_send_json_error( array( 'message' => 'Popup not found' ) );
		}

		// Update total views
		$current_views = (int) get_post_meta( $post_id, 'acumenpopup_views', true );
		update_post_meta( $post_id, 'acumenpopup_views', $current_views + 1 );

		// Daily tracking
		$today = current_time( 'Y-m-d' );
		$daily_views = (int) get_post_meta( $post_id, 'acumenpopup_views_' . $today, true );
		update_post_meta( $post_id, 'acumenpopup_views_' . $today, $daily_views + 1 );

		// Device tracking
		$device = $this->get_device_type();
		$device_views = (int) get_post_meta( $post_id, 'acumenpopup_views_device_' . $device, true );
		update_post_meta( $post_id, 'acumenpopup_views_device_' . $device, $device_views + 1 );

		wp_send_json_success( array( 'views' => $current_views + 1 ) );
	}

	/**
	 * Track popup form conversion.
	 *
	 * Increments the conversion count for a popup.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function track_conversion() {
		// Try form submit nonce or tracker nonce depending on caller
		if ( ! check_ajax_referer( 'acumenpopup_tracker', 'nonce', false ) && ! check_ajax_referer( 'acumenpopup_form_submit', 'nonce', false ) ) {
			wp_send_json_error( array( 'message' => 'Invalid nonce' ) );
		}

		$popup_id_raw = isset( $_POST['popup_id'] ) ? sanitize_text_field( wp_unslash( $_POST['popup_id'] ) ) : '';

		if ( empty( $popup_id_raw ) ) {
			wp_send_json_error( array( 'message' => 'Invalid popup ID' ) );
		}

		$args = array(
			'post_type'      => 'acumen_popup_cmpgn',
			'meta_key'       => 'acumenpopup_popup_id', // phpcs:ignore
			'meta_value'     => $popup_id_raw, // phpcs:ignore
			'fields'         => 'ids',
			'numberposts'    => 1,
			'post_status'    => 'any',
		);

		$posts = get_posts( $args );
		$post_id = ! empty( $posts ) ? $posts[0] : 0;

		if ( ! $post_id && is_numeric( $popup_id_raw ) ) {
			$post_id = absint( $popup_id_raw );
		}

		if ( ! $post_id ) {
			wp_send_json_error( array( 'message' => 'Popup not found' ) );
		}

		// Update total conversions
		$current_conversions = (int) get_post_meta( $post_id, 'acumenpopup_conversions', true );
		update_post_meta( $post_id, 'acumenpopup_conversions', $current_conversions + 1 );

		// Daily conversion tracking
		$today = current_time( 'Y-m-d' );
		$daily_conv = (int) get_post_meta( $post_id, 'acumenpopup_conv_' . $today, true );
		update_post_meta( $post_id, 'acumenpopup_conv_' . $today, $daily_conv + 1 );

		// Device conversion tracking
		$device = $this->get_device_type();
		$device_conv = (int) get_post_meta( $post_id, 'acumenpopup_conv_device_' . $device, true );
		update_post_meta( $post_id, 'acumenpopup_conv_device_' . $device, $device_conv + 1 );

		wp_send_json_success( array( 'conversions' => $current_conversions + 1 ) );
	}

	/**
	 * Detect device type from user agent.
	 *
	 * @return string 'mobile', 'tablet', or 'desktop'
	 */
	private function get_device_type() {
		$user_agent = isset( $_SERVER['HTTP_USER_AGENT'] ) ? sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ) : '';
		
		if ( preg_match( '/(tablet|ipad|playbook|silk)|(android(?!.*mobi))/i', $user_agent ) ) {
			return 'tablet';
		}
		
		if ( preg_match( '/Mobile|iP(hone|od)|Android|BlackBerry|IEMobile|Kindle|Silk-Accelerated|(hpw|web)OS|Opera M(obi|ini)/', $user_agent ) ) {
			return 'mobile';
		}
		
		return 'desktop';
	}

	/**
	 * Get analytics data.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function get_analytics_data() {
		check_ajax_referer( 'acumenpopup-nonce', 'nonce' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error( array( 'message' => 'Unauthorized' ), 403 );
		}

		// Accept date range and campaign filter from frontend
		$date_from   = isset( $_POST['date_from'] )   ? sanitize_text_field( wp_unslash( $_POST['date_from'] ) ) : '';
		$date_to     = isset( $_POST['date_to'] )     ? sanitize_text_field( wp_unslash( $_POST['date_to'] ) )   : '';
		$all_time    = isset( $_POST['all_time'] )    ? (bool) $_POST['all_time'] : false;
		$campaign_id = isset( $_POST['campaign_id'] ) ? absint( $_POST['campaign_id'] ) : 0;

		$now     = current_time( 'timestamp' );
		$from_ts = $date_from ? strtotime( $date_from ) : strtotime( '-6 days', $now );
		$to_ts   = $date_to   ? strtotime( $date_to )   : $now;

		if ( $from_ts > $to_ts ) {
			list( $from_ts, $to_ts ) = array( $to_ts, $from_ts );
		}

		// Build date range array for chart (cap at 60 days)
		$chart_dates = array();
		$diff_days   = (int) round( ( $to_ts - $from_ts ) / DAY_IN_SECONDS ) + 1;
		$diff_days   = min( $diff_days, 60 );
		for ( $i = $diff_days - 1; $i >= 0; $i-- ) {
			$date                  = gmdate( 'Y-m-d', strtotime( "-$i days", $to_ts ) );
			$chart_dates[ $date ]  = array( 'views' => 0, 'conversions' => 0 );
		}

		$query_args = array(
			'post_type'      => 'acumen_popup_cmpgn',
			'post_status'    => 'any',
			'posts_per_page' => -1,
		);
		if ( $campaign_id ) {
			$query_args['post__in'] = array( $campaign_id );
		}
		$campaigns = get_posts( $query_args );

		$total_views       = 0;
		$total_conversions = 0;
		$campaign_list     = array();
		$devices           = array( 'desktop' => 0, 'tablet' => 0, 'mobile' => 0 );

		foreach ( $campaigns as $post ) {
			$campaign_views = 0;
			$campaign_conv  = 0;

			foreach ( $chart_dates as $date => $stats ) {
				$dv = (int) get_post_meta( $post->ID, 'acumenpopup_views_' . $date, true );
				$dc = (int) get_post_meta( $post->ID, 'acumenpopup_conv_' . $date, true );
				$chart_dates[ $date ]['views']       += $dv;
				$chart_dates[ $date ]['conversions'] += $dc;
				$campaign_views += $dv;
				$campaign_conv  += $dc;
			}

			// For "All Time" use stored totals; otherwise use date-range sum
			if ( $all_time ) {
				$campaign_views = (int) get_post_meta( $post->ID, 'acumenpopup_views', true );
				$campaign_conv  = (int) get_post_meta( $post->ID, 'acumenpopup_conversions', true );
			}

			$total_views       += $campaign_views;
			$total_conversions += $campaign_conv;

			$devices['desktop'] += (int) get_post_meta( $post->ID, 'acumenpopup_views_device_desktop', true );
			$devices['tablet']  += (int) get_post_meta( $post->ID, 'acumenpopup_views_device_tablet', true );
			$devices['mobile']  += (int) get_post_meta( $post->ID, 'acumenpopup_views_device_mobile', true );

			$campaign_list[] = array(
				'id'          => $post->ID,
				'popup_id'    => get_post_meta( $post->ID, 'acumenpopup_popup_id', true ),
				'title'       => $post->post_title,
				'views'       => $campaign_views,
				'conversions' => $campaign_conv,
			);
		}

		$formatted_chart_data = array();
		foreach ( $chart_dates as $date => $stats ) {
			$formatted_chart_data[] = array(
				'date'        => gmdate( 'd M', strtotime( $date ) ),
				'views'       => $stats['views'],
				'conversions' => $stats['conversions'],
			);
		}

		wp_send_json_success( array(
			'total_views'       => $total_views,
			'total_conversions' => $total_conversions,
			'devices'           => $devices,
			'chart_data'        => $formatted_chart_data,
			'campaigns'         => $campaign_list,
		) );
	}

	/**
	 * Prevent cloning of the instance.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function __clone() {
		_doing_it_wrong(
			__FUNCTION__,
			esc_html__( 'Cloning is forbidden.', 'acumen-popup' ),
			'1.0.0'
		);
	}

	/**
	 * Prevent unserializing of the instance.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function __wakeup() {
		_doing_it_wrong(
			__FUNCTION__,
			esc_html__( 'Unserializing is forbidden.', 'acumen-popup' ),
			'1.0.0'
		);
	}
}