<?php
namespace App\Controllers\Admin;

use App\Core\AdminBaseController;
use Db\Database;

class FundRequestController extends AdminBaseController {

    public function __construct() {
        $this->checkLogin();
    }

    /**
     * 充提审核列表页
     */
    public function index() {
        $db = new Database();
        try {
            // 查询充提申请列表，JOIN users 获取用户名
            $requests = $db->select('fund_requests', [
                '[>]users' => ['user_id' => 'id']
            ], [
                'fund_requests.id',
                'fund_requests.user_id',
                'users.username',
                'users.usdt_address',
                'fund_requests.type',
                'fund_requests.amount',
                'fund_requests.status',
                'fund_requests.remark',
                'fund_requests.admin_remark',
                'fund_requests.operator_id',
                'fund_requests.created_at',
                'fund_requests.processed_at'
            ], [
                'ORDER' => ['fund_requests.id' => 'DESC'],
                'LIMIT' => 200
            ]);

            if (!is_array($requests)) {
                $requests = [];
            }

            // 统计各状态数量
            $pendingCount = $db->count('fund_requests', ['status' => 'pending']);
            $todayDeposit = $db->count('fund_requests', [
                'type' => 'deposit',
                'created_at[>=]' => date('Y-m-d 00:00:00')
            ]);
            $todayWithdraw = $db->count('fund_requests', [
                'type' => 'withdraw',
                'created_at[>=]' => date('Y-m-d 00:00:00')
            ]);

        } catch (\Throwable $e) {
            $requests = [];
            $pendingCount = 0;
            $todayDeposit = 0;
            $todayWithdraw = 0;
        }

        $this->render('Admin/fund_requests.php', [
            'requests' => $requests,
            'pendingCount' => $pendingCount,
            'todayDeposit' => $todayDeposit,
            'todayWithdraw' => $todayWithdraw,
            'title' => '充提审核'
        ]);
    }

    /**
     * 审批通过
     */
    public function approve() {
        header('Content-Type: application/json');

        $rawData = file_get_contents('php://input');
        $data = json_decode($rawData, true);

        if (json_last_error() !== JSON_ERROR_NONE) {
            echo json_encode(['success' => false, 'message' => '数据格式错误']);
            return;
        }

        $id = isset($data['id']) ? (int)$data['id'] : 0;
        $adminRemark = trim($data['admin_remark'] ?? '');

        if ($id <= 0) {
            echo json_encode(['success' => false, 'message' => '无效的申请ID']);
            return;
        }

        $db = new Database();

        try {
            // 查询申请记录
            $request = $db->get('fund_requests', '*', ['id' => $id]);
            if (!$request) {
                echo json_encode(['success' => false, 'message' => '申请记录不存在']);
                return;
            }

            if ($request['status'] !== 'pending') {
                echo json_encode(['success' => false, 'message' => '该申请已处理，状态：' . $request['status']]);
                return;
            }

            $userId = (int)$request['user_id'];
            $amount = floatval($request['amount']);
            $type = $request['type'];

            // 获取用户信息
            $user = $db->get('users', ['id', 'balance'], ['id' => $userId]);
            if (!$user) {
                echo json_encode(['success' => false, 'message' => '用户不存在']);
                return;
            }

            $balanceBefore = floatval($user['balance']);
            $now = date('Y-m-d H:i:s');
            $operatorId = $_SESSION['user_id'] ?? 0;

            // 开启事务
            $db->medoo->pdo->beginTransaction();

            if ($type === 'deposit') {
                // 充值：给用户加款
                $balanceAfter = $balanceBefore + $amount;

                $db->update('users', [
                    'balance' => $balanceAfter,
                    'updated_at' => $now
                ], ['id' => $userId]);

                $db->insert('transactions', [
                    'user_id' => $userId,
                    'type' => 'deposit',
                    'amount' => $amount,
                    'balance_before' => $balanceBefore,
                    'balance_after' => $balanceAfter,
                    'description' => '充值申请审核通过 #' . $id,
                    'created_at' => $now
                ]);
            } else {
                // 提现：余额已在申请时预扣，确认放款
                $balanceAfter = $balanceBefore; // 余额不变，已预扣

                $db->insert('transactions', [
                    'user_id' => $userId,
                    'type' => 'withdraw',
                    'amount' => -$amount,
                    'balance_before' => $balanceBefore,
                    'balance_after' => $balanceAfter,
                    'description' => '提现申请审核通过 #' . $id,
                    'created_at' => $now
                ]);
            }

            // 更新申请状态
            $db->update('fund_requests', [
                'status' => 'approved',
                'admin_remark' => $adminRemark,
                'operator_id' => $operatorId,
                'processed_at' => $now
            ], ['id' => $id]);

            $db->medoo->pdo->commit();

            echo json_encode(['success' => true, 'message' => '审批通过']);

        } catch (\Exception $e) {
            if ($db->medoo->pdo->inTransaction()) {
                $db->medoo->pdo->rollBack();
            }
            echo json_encode(['success' => false, 'message' => '操作失败：' . $e->getMessage()]);
        }
    }

    /**
     * 拒绝申请
     */
    public function reject() {
        header('Content-Type: application/json');

        $rawData = file_get_contents('php://input');
        $data = json_decode($rawData, true);

        if (json_last_error() !== JSON_ERROR_NONE) {
            echo json_encode(['success' => false, 'message' => '数据格式错误']);
            return;
        }

        $id = isset($data['id']) ? (int)$data['id'] : 0;
        $adminRemark = trim($data['admin_remark'] ?? '');

        if ($id <= 0) {
            echo json_encode(['success' => false, 'message' => '无效的申请ID']);
            return;
        }

        $db = new Database();

        try {
            // 查询申请记录
            $request = $db->get('fund_requests', '*', ['id' => $id]);
            if (!$request) {
                echo json_encode(['success' => false, 'message' => '申请记录不存在']);
                return;
            }

            if ($request['status'] !== 'pending') {
                echo json_encode(['success' => false, 'message' => '该申请已处理，状态：' . $request['status']]);
                return;
            }

            $userId = (int)$request['user_id'];
            $amount = floatval($request['amount']);
            $type = $request['type'];
            $now = date('Y-m-d H:i:s');
            $operatorId = $_SESSION['user_id'] ?? 0;

            // 开启事务
            $db->medoo->pdo->beginTransaction();

            if ($type === 'withdraw') {
                // 提现拒绝：退还预扣余额
                $user = $db->get('users', ['id', 'balance'], ['id' => $userId]);
                if ($user) {
                    $balanceBefore = floatval($user['balance']);
                    $balanceAfter = $balanceBefore + $amount;

                    $db->update('users', [
                        'balance' => $balanceAfter,
                        'updated_at' => $now
                    ], ['id' => $userId]);

                    $db->insert('transactions', [
                        'user_id' => $userId,
                        'type' => 'refund',
                        'amount' => $amount,
                        'balance_before' => $balanceBefore,
                        'balance_after' => $balanceAfter,
                        'description' => '提现申请被拒绝，退还预扣金额 #' . $id,
                        'created_at' => $now
                    ]);
                }
            }
            // 充值拒绝：无需退款

            // 更新申请状态
            $db->update('fund_requests', [
                'status' => 'rejected',
                'admin_remark' => $adminRemark,
                'operator_id' => $operatorId,
                'processed_at' => $now
            ], ['id' => $id]);

            $db->medoo->pdo->commit();

            echo json_encode(['success' => true, 'message' => '已拒绝']);

        } catch (\Exception $e) {
            if ($db->medoo->pdo->inTransaction()) {
                $db->medoo->pdo->rollBack();
            }
            echo json_encode(['success' => false, 'message' => '操作失败：' . $e->getMessage()]);
        }
    }

    /**
     * 获取待处理数量（轮询接口）
     */
    public function pendingCount() {
        header('Content-Type: application/json');

        $db = new Database();
        try {
            $count = $db->count('fund_requests', ['status' => 'pending']);
            echo json_encode(['count' => (int)$count]);
        } catch (\Throwable $e) {
            echo json_encode(['count' => 0]);
        }
    }
}