<?php
/**
 * User metric accumulators for medal get_type + integral XP.
 *
 * Maintains user_meta counters used by AKSRT_User_Badges::metric_value()
 * and grants level XP / re-evaluates medals on the same events as free points.
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_User_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_BBS_ADOPT         = 'aksrt_bbs_adopt_count';
	public const META_BBS_COMMENT_HOT   = 'aksrt_bbs_comment_hot_count';
	public const META_BBS_POST_HOT      = 'aksrt_bbs_post_hot_count';
	public const META_BBS_ESSENCE       = 'aksrt_bbs_essence_count';
	public const META_BBS_SCORE         = 'aksrt_bbs_score_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_forum_topic_featured', [$this, 'on_forum_topic_featured'], 20, 2);
		add_action('aksrt_forum_reply_adopted', [$this, 'on_forum_reply_adopted'], 20, 3);
		add_action('aksrt_forum_comment_hot', [$this, 'on_forum_comment_hot'], 20, 2);
		add_action('aksrt_forum_topic_hot', [$this, 'on_forum_topic_hot'], 20, 2);
		add_action('aksrt_forum_topic_scored', [$this, 'on_forum_topic_scored'], 20, 3);

		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);

		// Free-points / social hooks also feed level XP.
		add_action('aksrt_post_liked', [$this, 'level_on_post_liked'], 25, 3);
		add_action('aksrt_comment_liked', [$this, 'level_on_comment_liked'], 25, 3);
		add_action('aksrt_post_favorited', [$this, 'level_on_post_favorited'], 25, 3);
		add_action('aksrt_user_followed', [$this, 'level_on_user_followed'], 25, 2);
		add_action('aksrt_forum_topic_featured', [$this, 'level_on_forum_topic_featured'], 25, 2);
		add_action('aksrt_forum_reply_adopted', [$this, 'level_on_forum_reply_adopted'], 25, 3);
		add_action('aksrt_forum_comment_hot', [$this, 'level_on_forum_comment_hot'], 25, 2);
		add_action('aksrt_forum_topic_hot', [$this, 'level_on_forum_topic_hot'], 25, 2);
		add_action('aksrt_forum_topic_scored', [$this, 'level_on_forum_topic_scored'], 25, 3);
		add_action('aksrt_forum_topic_created', [$this, 'level_on_forum_topic_created'], 25, 2);
		add_action('aksrt_user_signed_in', [$this, 'level_on_user_signed_in'], 25, 1);
	}

	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')) {
			AKSRT_User_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 $author_id
	 */
	public function on_forum_topic_featured($topic_id, $author_id = 0): void {
		$author_id = (int) $author_id;
		if ($author_id <= 0) {
			$post = get_post((int) $topic_id);
			$author_id = $post ? (int) $post->post_author : 0;
		}
		if ($author_id <= 0) {
			return;
		}
		self::bump_user_meta($author_id, self::META_BBS_ESSENCE, 1.0);
		self::reevaluate_medals($author_id);
	}

	/**
	 * @param int $topic_id
	 * @param int $comment_id
	 * @param int $adoptee_id
	 */
	public function on_forum_reply_adopted($topic_id, $comment_id, $adoptee_id): void {
		unset($topic_id, $comment_id);
		$adoptee_id = (int) $adoptee_id;
		if ($adoptee_id <= 0) {
			return;
		}
		self::bump_user_meta($adoptee_id, self::META_BBS_ADOPT, 1.0);
		self::reevaluate_medals($adoptee_id);
	}

	/**
	 * @param int $comment_id
	 * @param int $author_id
	 */
	public function on_forum_comment_hot($comment_id, $author_id = 0): void {
		$author_id = (int) $author_id;
		if ($author_id <= 0) {
			$c = get_comment((int) $comment_id);
			$author_id = $c ? (int) $c->user_id : 0;
		}
		if ($author_id <= 0) {
			return;
		}
		self::bump_user_meta($author_id, self::META_BBS_COMMENT_HOT, 1.0);
		self::reevaluate_medals($author_id);
	}

	/**
	 * @param int $topic_id
	 * @param int $author_id
	 */
	public function on_forum_topic_hot($topic_id, $author_id = 0): void {
		$author_id = (int) $author_id;
		if ($author_id <= 0) {
			$post = get_post((int) $topic_id);
			$author_id = $post ? (int) $post->post_author : 0;
		}
		if ($author_id <= 0) {
			return;
		}
		self::bump_user_meta($author_id, self::META_BBS_POST_HOT, 1.0);
		self::reevaluate_medals($author_id);
	}

	/**
	 * @param int   $topic_id
	 * @param int   $author_id
	 * @param float $delta
	 */
	public function on_forum_topic_scored($topic_id, $author_id, $delta = 0): void {
		unset($topic_id);
		$author_id = (int) $author_id;
		$delta     = (float) $delta;
		if ($author_id <= 0 || $delta == 0.0) {
			return;
		}
		self::bump_user_meta($author_id, self::META_BBS_SCORE, $delta);
		self::reevaluate_medals($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);
	}

	/* ---------- level XP bridges ---------- */

	private static function level_add(int $user_id, string $key): void {
		if ($user_id > 0 && class_exists('AKSRT_User_Level')) {
			AKSRT_User_Level::add($user_id, $key);
		}
	}

	public function level_on_post_liked(int $post_id, int $actor_id, bool $active): void {
		if (!$active) {
			return;
		}
		$post = get_post($post_id);
		if (!$post instanceof WP_Post) {
			return;
		}
		$author = (int) $post->post_author;
		if ($author > 0 && $author !== $actor_id) {
			self::level_add($author, 'post_like');
		}
	}

	public function level_on_comment_liked(int $comment_id, int $actor_id, bool $active): void {
		if (!$active) {
			return;
		}
		$c = get_comment($comment_id);
		if (!$c) {
			return;
		}
		$author = (int) $c->user_id;
		if ($author > 0 && $author !== $actor_id) {
			self::level_add($author, 'comment_like');
		}
	}

	public function level_on_post_favorited(int $post_id, int $actor_id, bool $active): void {
		if (!$active) {
			return;
		}
		$post = get_post($post_id);
		if (!$post instanceof WP_Post) {
			return;
		}
		$author = (int) $post->post_author;
		if ($author > 0 && $author !== $actor_id) {
			self::level_add($author, 'post_favorite');
		}
	}

	public function level_on_user_followed(int $follower_id, int $following_id): void {
		unset($follower_id);
		self::level_add((int) $following_id, 'followed');
	}

	public function level_on_forum_topic_featured($topic_id, $author_id = 0): void {
		unset($topic_id);
		self::level_add((int) $author_id, 'bbs_essence');
	}

	public function level_on_forum_reply_adopted($topic_id, $comment_id, $adoptee_id): void {
		unset($topic_id, $comment_id);
		self::level_add((int) $adoptee_id, 'bbs_adopt');
	}

	public function level_on_forum_comment_hot($comment_id, $author_id = 0): void {
		unset($comment_id);
		self::level_add((int) $author_id, 'bbs_comment_hot');
	}

	public function level_on_forum_topic_hot($topic_id, $author_id = 0): void {
		unset($topic_id);
		self::level_add((int) $author_id, 'bbs_posts_hot');
	}

	public function level_on_forum_topic_scored($topic_id, $author_id, $delta = 0): void {
		unset($topic_id);
		if ((float) $delta > 0) {
			self::level_add((int) $author_id, 'bbs_score_extra');
		}
	}

	/**
	 * @param int $user_id
	 * @param int $topic_id
	 */
	public function level_on_forum_topic_created($user_id, $topic_id = 0): void {
		unset($topic_id);
		self::level_add((int) $user_id, 'bbs_posts_new');
	}

	public function level_on_user_signed_in(int $user_id): void {
		// Sign-in XP: use sign_in key once/day via existing login guard path as well.
		self::level_add($user_id, 'sign_in');
	}
}