<?php
/**
 * AKSRT Credits Earn
 *
 * 积分获取入口，挂载到 WordPress 钩子：
 *   - 注册赠送   → user_register
 *   - 评论奖励   → wp_insert_comment / transition_comment_status
 *   - 签到/邀请  → 由 AKSRT_Signin / AKSRT_Invite 独立处理（REST）
 *
 * 所有发放都受 aksrt_credit_settings.* 子开关控制，关闭后不发放。
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Credits_Earn {

    private static $instance = null;

    private function __construct() {}

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

    public function init(): void {
        // 注册赠送
        add_action('user_register', [$this, 'on_user_register'], 10, 1);

        // 评论奖励：on_approved 时机决定挂到哪个钩子
        // 默认 on_approved=true → 仅审核通过后发；否则插入即发
        add_action('wp_insert_comment', [$this, 'on_comment_inserted'], 10, 2);
        add_action('transition_comment_status', [$this, 'on_comment_transition'], 10, 3);

        // 论坛发帖奖励
        add_action('aksrt_forum_topic_created', [$this, 'on_forum_topic_created'], 10, 2);

        // 论坛回复奖励（§7.7）
        add_action('comment_post', [$this, 'on_forum_reply_posted'], 20, 3);

        // 论坛精华/热帖奖励（§7.7）
        add_action('aksrt_forum_topic_featured', [$this, 'on_forum_topic_featured'], 10, 2);
    }

    /**
     * 论坛发帖积分奖励
     */
    public function on_forum_topic_created(int $user_id, int $post_id): void {
        if (!class_exists('AKSRT_Credits') || !class_exists('AKSRT_Settings')) return;
        $cfg = AKSRT_Settings::get_credit_settings();
        if (empty($cfg['enabled'])) return;
        $reward = $cfg['forum_topic_reward'] ?? [];
        if (empty($reward['enabled'])) return;

        $amount = (int) ($reward['amount'] ?? 0);
        if ($amount <= 0) return;

        $daily_limit = (int) ($reward['daily_limit'] ?? 5);
        $today_count = $this->today_forum_reward_count($user_id, 'topic');
        if ($today_count >= $daily_limit) return;

        AKSRT_Credits::add($user_id, $amount, 'forum_topic', ['type' => 'post', 'id' => $post_id]);
    }

    /**
     * 今日论坛奖励次数
     */
    private function today_forum_reward_count(int $user_id, string $type = 'topic'): int {
        global $wpdb;
        $table = AKSRT_DB_Migrator::table('credit_log');
        if (!$table) return 0;

        $today = current_time('Y-m-d');
        return (int) $wpdb->get_var($wpdb->prepare(
            "SELECT COUNT(*) FROM {$table} WHERE user_id = %d AND reason = %s AND DATE(created_at) = %s",
            $user_id, 'forum_' . $type, $today
        ));
    }

    /**
     * 注册赠送。
     */
    public function on_user_register(int $user_id): void {
        if (!class_exists('AKSRT_Credits') || !class_exists('AKSRT_Settings')) return;
        $cfg = AKSRT_Settings::get_credit_settings();
        if (empty($cfg['enabled'])) return;
        $bonus = (int) ($cfg['register_bonus'] ?? 0);
        if ($bonus <= 0) return;

        AKSRT_Credits::add($user_id, $bonus, 'register', ['type' => 'user', 'id' => $user_id]);
    }

    /**
     * 评论插入（直接发表无需审核场景）。
     */
    public function on_comment_inserted(int $comment_id, $comment): void {
        if (!class_exists('AKSRT_Settings')) return;
        $cfg = AKSRT_Settings::get_credit_settings();
        $reward = $cfg['comment_reward'] ?? [];
        if (empty($cfg['enabled']) || empty($reward['enabled'])) return;

        // 仅审核通过后发放 → 不在 insert 时处理
        if (!empty($reward['on_approved'])) return;

        $comment = $comment instanceof WP_Comment ? $comment : get_comment($comment_id);
        if (!($comment instanceof WP_Comment)) return;

        // 只奖励已批准的评论
        if ((int) $comment->comment_approved !== 1) return;

        $this->maybe_reward_comment($comment, $reward);
    }

    /**
     * 评论状态流转。
     */
    public function on_comment_transition($new_status, $old_status, $comment): void {
        if (!class_exists('AKSRT_Settings')) return;
        $cfg = AKSRT_Settings::get_credit_settings();
        $reward = $cfg['comment_reward'] ?? [];
        if (empty($cfg['enabled']) || empty($reward['enabled'])) return;
        if (empty($reward['on_approved'])) return;

        if ($new_status !== 'approved') return;
        // 跳过已经处理过的：以 commentmeta 标记
        if (!($comment instanceof WP_Comment)) return;

        $this->maybe_reward_comment($comment, $reward);
    }

    /**
     * 真正的评论奖励逻辑（含字数 / 每日上限 / 去重）。
     */
    private function maybe_reward_comment(WP_Comment $comment, array $reward): void {
        $user_id = (int) $comment->user_id;
        if ($user_id <= 0) return;

        // 防重复：commentmeta 标记
        if (get_comment_meta($comment->comment_ID, 'aksrt_credit_rewarded', true)) return;

        $min_length = (int) ($reward['min_length'] ?? 0);
        if ($min_length > 0 && mb_strlen(strip_tags($comment->comment_content)) < $min_length) return;

        $amount = (int) ($reward['amount'] ?? 0);
        if ($amount <= 0) return;

        // 每日上限
        $cap = (int) ($reward['daily_cap'] ?? 0);
        if ($cap > 0) {
            $today_count = $this->today_comment_reward_count($user_id);
            if ($today_count >= $cap) {
                update_comment_meta($comment->comment_ID, 'aksrt_credit_rewarded', 'capped');
                return;
            }
        }

        $result = AKSRT_Credits::add(
            $user_id,
            $amount,
            'comment',
            ['type' => 'comment', 'id' => (int) $comment->comment_ID]
        );
        if (!is_wp_error($result)) {
            update_comment_meta($comment->comment_ID, 'aksrt_credit_rewarded', 1);
        }
    }

    /**
     * 当日评论奖励次数（查询 credit_log）。
     */
    private function today_comment_reward_count(int $user_id): int {
        global $wpdb;
        if (!class_exists('AKSRT_DB_Migrator')) return 0;
        $table = AKSRT_DB_Migrator::table('credit_log');
        if (!$table) return 0;

        // 站点时区当日 00:00 起
        $tz = wp_timezone();
        $today = (new DateTimeImmutable('today', $tz))->format('Y-m-d H:i:s');
        // 转 UTC（数据库 created_at 用 mysql UTC）
        $today_utc = (new DateTimeImmutable('today', $tz))->setTimezone(new DateTimeZone('UTC'))->format('Y-m-d H:i:s');

        return (int) $wpdb->get_var($wpdb->prepare(
            "SELECT COUNT(*) FROM {$table} WHERE user_id = %d AND reason = 'comment' AND created_at >= %s",
            $user_id,
            $today_utc
        ));
    }

    // ================================================================
    // Forum credits (§7.7)
    // ================================================================

    public function on_forum_reply_posted(int $comment_id, $approved, array $commentdata = []): void {
        if (!class_exists('AKSRT_Credits') || !class_exists('AKSRT_Settings')) return;
        if (!class_exists('AKSRT_Forum')) return;

        $comment = get_comment($comment_id);
        if (!$comment) return;

        $post = get_post((int) $comment->comment_post_ID);
        if (!$post || $post->post_type !== 'aksrt_forum_topic') return;

        if ((int) $comment->comment_approved !== 1) return;

        $user_id = (int) $comment->user_id;
        if ($user_id <= 0) return;

        $forum_cfg = AKSRT_Settings::get_forum_settings();
        $amount = (int) ($forum_cfg['credits']['comment_new'] ?? 2);
        if ($amount <= 0) return;

        $daily_max = (int) ($forum_cfg['credits']['daily_max'] ?? 50);
        $today_count = $this->today_forum_reward_count($user_id, 'reply');
        if ($today_count >= $daily_max) return;

        AKSRT_Credits::add($user_id, $amount, 'forum_reply', [
            'type' => 'comment',
            'id'   => $comment_id,
        ]);
    }

    public function on_forum_topic_featured(int $topic_id, int $operator_id): void {
        // Essence reward is handled in AKSRT_Forum::reward_essence().
        // This hook is for additional integrations if needed.
    }
}