<?php
/**
 * AKSRT Withdrawal — 提现台账
 *
 * 管理用户提现申请、审核和处理。
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

class AKSRT_Withdrawal {

    const STATUS_PENDING   = 'pending';
    const STATUS_APPROVED  = 'approved';
    const STATUS_PROCESSING = 'processing';
    const STATUS_COMPLETED = 'completed';
    const STATUS_REJECTED  = 'rejected';

    private static $instance = null;

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

    private function table(): string {
        return AKSRT_DB_Migrator::table('withdrawal');
    }

    /**
     * 创建提现申请
     */
    public function create(int $user_id, float $amount, string $method = '', string $account_info = ''): int {
        global $wpdb;

        if ($user_id <= 0 || $amount <= 0) return 0;

        $wpdb->insert($this->table(), [
            'user_id'      => $user_id,
            'amount'       => $amount,
            'method'       => sanitize_key($method),
            'account_info' => sanitize_textarea_field($account_info),
            'status'       => self::STATUS_PENDING,
            'created_at'   => current_time('mysql'),
        ], ['%d', '%f', '%s', '%s', '%s', '%s']);

        return (int) $wpdb->insert_id;
    }

    /**
     * 更新提现状态
     */
    public function update_status(int $withdrawal_id, string $new_status, string $note = ''): bool {
        global $wpdb;

        $update = ['status' => sanitize_key($new_status)];
        $format = ['%s'];

        if ($new_status === self::STATUS_COMPLETED || $new_status === self::STATUS_REJECTED) {
            $update['processed_at'] = current_time('mysql');
            $format[] = '%s';
        }

        if ($note !== '') {
            $update['note'] = sanitize_textarea_field($note);
            $format[] = '%s';
        }

        return $wpdb->update($this->table(), $update, ['id' => $withdrawal_id], $format, ['%d']) !== false;
    }

    /**
     * 获取用户提现列表
     */
    public function get_user_withdrawals(int $user_id, array $args = []): array {
        global $wpdb;

        $where = ['user_id = %d'];
        $params = [$user_id];

        $status = sanitize_key((string) ($args['status'] ?? ''));
        if ($status !== '') {
            $where[] = 'status = %s';
            $params[] = $status;
        }

        $limit  = max(1, min(100, (int) ($args['limit'] ?? 20)));
        $offset = max(0, (int) ($args['offset'] ?? 0));

        $sql = "SELECT * FROM {$this->table()} WHERE " . implode(' AND ', $where) . " ORDER BY created_at DESC LIMIT %d OFFSET %d";
        $params[] = $limit;
        $params[] = $offset;

        return (array) $wpdb->get_results($wpdb->prepare($sql, $params), ARRAY_A);
    }

    /**
     * 获取所有提现列表（管理后台）
     */
    public function get_all(array $args = []): array {
        global $wpdb;

        $where = [];
        $params = [];

        $status = sanitize_key((string) ($args['status'] ?? ''));
        if ($status !== '') {
            $where[] = 'status = %s';
            $params[] = $status;
        }

        $limit  = max(1, min(100, (int) ($args['limit'] ?? 20)));
        $offset = max(0, (int) ($args['offset'] ?? 0));

        $where_sql = $where ? 'WHERE ' . implode(' AND ', $where) : '';
        $sql = "SELECT * FROM {$this->table()} {$where_sql} ORDER BY created_at DESC LIMIT %d OFFSET %d";
        $params[] = $limit;
        $params[] = $offset;

        if (!empty($params)) {
            return (array) $wpdb->get_results($wpdb->prepare($sql, $params), ARRAY_A);
        }
        return (array) $wpdb->get_results($sql, ARRAY_A);
    }

    /**
     * 获取提现总数（支持状态过滤）
     */
    public function get_count(array $args = []): int {
        global $wpdb;

        $status = sanitize_key((string) ($args['status'] ?? ''));
        if ($status !== '') {
            return (int) $wpdb->get_var($wpdb->prepare(
                "SELECT COUNT(*) FROM {$this->table()} WHERE status = %s",
                $status
            ));
        }
        return (int) $wpdb->get_var("SELECT COUNT(*) FROM {$this->table()}");
    }

    /**
     * 获取提现统计
     */
    public function get_stats(): array {
        global $wpdb;

        $row = $wpdb->get_row(
            "SELECT
                COUNT(*) as total,
                SUM(CASE WHEN status = 'pending' THEN 1 ELSE 0 END) as pending,
                SUM(CASE WHEN status = 'completed' THEN 1 ELSE 0 END) as completed,
                COALESCE(SUM(CASE WHEN status = 'completed' THEN amount ELSE 0 END), 0) as total_paid
            FROM {$this->table()}",
            ARRAY_A
        );

        return [
            'total'       => (int) ($row['total'] ?? 0),
            'pending'     => (int) ($row['pending'] ?? 0),
            'completed'   => (int) ($row['completed'] ?? 0),
            'total_paid'  => (float) ($row['total_paid'] ?? 0),
        ];
    }
}