<?php
/**
 * @package AKSRT
 */

namespace AKSRT\User;

defined('ABSPATH') || exit;

class Metrics {

	public const META_POST_LIKE_SUM     = 'aksrt_posts_like_sum';
	public const META_COMMENT_LIKE_SUM  = 'aksrt_comment_like_sum';
	public const META_POSTS_VIEWS_SUM   = 'aksrt_posts_views_sum';
	public const META_PAY_INCOME        = 'aksrt_pay_income_sum';
	public const META_PAY_REBATE        = 'aksrt_pay_rebate_sum';
	public const META_CHECKIN_ALL_DAY   = 'aksrt_checkin_all_day';

	/** @var self|null */
	private static $instance = null;

	public static function get_instance(): self {
		if (null === self::$instance) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	public function init(): void {
		add_action('aksrt_post_liked', [$this, 'on_post_liked'], 20, 3);
		add_action('aksrt_comment_liked', [$this, 'on_comment_liked'], 20, 3);
		add_action('aksrt_post_favorited', [$this, 'on_post_favorited'], 20, 3);
		add_action('aksrt_user_followed', [$this, 'on_user_followed'], 20, 2);
		add_action('aksrt_post_viewed', [$this, 'on_post_viewed'], 20, 2);

		add_action('aksrt_user_signed_in', [$this, 'on_user_signed_in'], 20, 1);
		add_action('aksrt_creator_income_added', [$this, 'on_creator_income_added'], 20, 3);
		add_action('aksrt_pay_rebate_added', [$this, 'on_pay_rebate_added'], 20, 3);
	}

	public static function bump_user_meta(int $user_id, string $meta_key, float $delta = 1.0): float {
		if ($user_id <= 0 || $meta_key === '' || $delta == 0.0) {
			return 0.0;
		}
		$current = (float) get_user_meta($user_id, $meta_key, true);
		$next    = max(0.0, $current + $delta);
		update_user_meta($user_id, $meta_key, $next);
		return $next;
	}

	public static function reevaluate_medals(int $user_id): void {
		if ($user_id > 0 && class_exists('AKSRT\\User\\Badges') && method_exists('AKSRT\\User\\Badges', 'auto_evaluate')) {
			Badges::auto_evaluate($user_id);
		}
	}

	public function on_post_liked(int $post_id, int $actor_id, bool $active): void {
		$post = get_post($post_id);
		if (!$post instanceof \WP_Post || $post->post_type !== 'post') {
			return;
		}
		$author = (int) $post->post_author;
		if ($author <= 0 || $author === $actor_id) {
			return;
		}
		self::bump_user_meta($author, self::META_POST_LIKE_SUM, $active ? 1.0 : -1.0);
		if ($active) {
			self::reevaluate_medals($author);
		}
	}

	public function on_comment_liked(int $comment_id, int $actor_id, bool $active): void {
		$comment = get_comment($comment_id);
		if (!$comment) {
			return;
		}
		$author = (int) $comment->user_id;
		if ($author <= 0 || $author === $actor_id) {
			return;
		}
		self::bump_user_meta($author, self::META_COMMENT_LIKE_SUM, $active ? 1.0 : -1.0);
		if ($active) {
			self::reevaluate_medals($author);
		}
	}

	public function on_post_favorited(int $post_id, int $actor_id, bool $active): void {
		unset($post_id, $actor_id, $active);
		// Favorite is free-points / level only; no dedicated medal get_type.
	}

	public function on_user_followed(int $follower_id, int $following_id): void {
		unset($follower_id);
		if ($following_id > 0) {
			self::reevaluate_medals($following_id);
		}
	}

	public function on_post_viewed(int $post_id, int $viewer_id = 0): void {
		unset($viewer_id);
		$post = get_post($post_id);
		if (!$post instanceof \WP_Post || $post->post_type !== 'post') {
			return;
		}
		$author = (int) $post->post_author;
		if ($author <= 0) {
			return;
		}
		self::bump_user_meta($author, self::META_POSTS_VIEWS_SUM, 1.0);
		// Cheap throttle: reevaluate every 50 views on author sum.
		$sum = (float) get_user_meta($author, self::META_POSTS_VIEWS_SUM, true);
		if (((int) $sum % 50) === 0) {
			self::reevaluate_medals($author);
		}
	}

	/**
	 * @param int $topic_id
	 * @param int $author_id
	 */
	public function on_user_signed_in(int $user_id): void {
		if ($user_id <= 0) {
			return;
		}
		self::bump_user_meta($user_id, self::META_CHECKIN_ALL_DAY, 1.0);
		self::reevaluate_medals($user_id);
	}

	/**
	 * @param int   $user_id
	 * @param float $amount
	 * @param array $context
	 */
	public function on_creator_income_added($user_id, $amount, $context = []): void {
		unset($context);
		$user_id = (int) $user_id;
		$amount  = (float) $amount;
		if ($user_id <= 0 || $amount <= 0) {
			return;
		}
		self::bump_user_meta($user_id, self::META_PAY_INCOME, $amount);
		self::reevaluate_medals($user_id);
	}

	/**
	 * @param int   $user_id
	 * @param float $amount
	 * @param array $context
	 */
	public function on_pay_rebate_added($user_id, $amount, $context = []): void {
		unset($context);
		$user_id = (int) $user_id;
		$amount  = (float) $amount;
		if ($user_id <= 0 || $amount <= 0) {
			return;
		}
		self::bump_user_meta($user_id, self::META_PAY_REBATE, $amount);
		self::reevaluate_medals($user_id);
	}
}