<?php

namespace app\admin\controller;

use app\common\controller\Backend;
use app\common\library\InvoiceService;
use think\Db;
use think\exception\PDOException;

/**
 * 开票申请管理
 *
 * 开票申请仅由用户/商户端发起，后台负责财务审核与开具交付：
 * 待开具(wait) → 已开票(issued，必填发票号，支持上传电子发票PDF/图片，锁定关联订单为已开票)
 *             → 驳回(reject，必填原因，自动释放开票额度并解锁关联订单)
 *
 * @icon fa fa-file-text-o
 */
class Invoice extends Backend
{
    /**
     * Invoice模型对象
     * @var \app\admin\model\Invoice
     */
    protected $model = null;
    protected $relationSearch = true;
    protected $searchFields = 'id,invoice_sn,title,tax_no,invoice_no,email,merchant.name,user.nickname';

    /**
     * 开票处理状态机：当前状态 => 允许流转到的目标状态
     * issued / reject / cancel 为终态
     * @var array
     */
    protected $statusFlow = [
        'wait' => ['issued', 'reject'],
    ];

    public function _initialize()
    {
        parent::_initialize();
        $this->model = new \app\admin\model\Invoice;
        $this->view->assign("typeList", $this->model->getTypeList());
        $this->view->assign("titleTypeList", $this->model->getTitleTypeList());
        $this->view->assign("statusList", $this->model->getStatusList());
    }

    /**
     * 开票申请列表：关联申请人/商户
     */
    public function index()
    {
        $this->request->filter(['strip_tags', 'trim']);
        if (false === $this->request->isAjax()) {
            return $this->view->fetch();
        }
        if ($this->request->request('keyField')) {
            return $this->selectpage();
        }
        [$where, $sort, $order, $offset, $limit] = $this->buildparams();
        $list = $this->model
            ->with(['user', 'merchant'])
            ->where($where)
            ->order($sort, $order)
            ->paginate($limit);
        $result = ['total' => $list->total(), 'rows' => $list->items()];
        return json($result);
    }

    /**
     * 详情回看（复用 edit 只读视图）
     */
    public function detail($ids = null)
    {
        $row = $this->model->with(['user', 'merchant'])->where('invoice.id', (int)$ids)->find();
        if (!$row) {
            $this->error(__('No Results were found'));
        }
        $linkedOrders = InvoiceService::fetchLinkedOrders((string)$row['order_ids'], (int)$row['id']);
        $this->view->assign('row', $row);
        $this->view->assign('linkedOrders', $linkedOrders);
        $this->view->assign('flowOptions', []);
        return $this->view->fetch('edit');
    }

    /**
     * 财务开票处理：申请信息只读，仅允许填写开票结果与上传电子发票文件
     */
    public function edit($ids = null)
    {
        $row = $this->model->with(['user', 'merchant'])->where('invoice.id', (int)$ids)->find();
        if (!$row) {
            $this->error(__('No Results were found'));
        }
        if (false === $this->request->isPost()) {
            $linkedOrders = InvoiceService::fetchLinkedOrders((string)$row['order_ids'], (int)$row['id']);
            $this->view->assign('row', $row);
            $this->view->assign('linkedOrders', $linkedOrders);
            $this->view->assign('flowOptions', $this->statusFlow[$row['status']] ?? []);
            return $this->view->fetch();
        }

        $status      = (string)$this->request->post('row.status');
        $invoiceCode = trim((string)$this->request->post('row.invoice_code'));
        $invoiceNo   = trim((string)$this->request->post('row.invoice_no'));
        $invoiceFile = trim((string)$this->request->post('row.invoice_file'));
        $auditMsg    = trim((string)$this->request->post('row.audit_msg'));

        if (!isset($this->statusFlow[$row['status']])) {
            $this->error('该开票申请已处理或已撤回，不允许再次变更');
        }
        if (!in_array($status, $this->statusFlow[$row['status']], true)) {
            $this->error('状态流转不合法，请刷新后重试');
        }
        if ($status === 'issued' && $invoiceNo === '') {
            $this->error('标记开票完成必须填写发票号码');
        }
        if ($status === 'reject' && $auditMsg === '') {
            $this->error('驳回时必须填写驳回原因');
        }

        $now = time();
        Db::startTrans();
        try {
            $updateData = [
                'status'       => $status,
                'invoice_code' => $invoiceCode !== '' ? mb_substr($invoiceCode, 0, 50) : $row['invoice_code'],
                'invoice_no'   => $invoiceNo !== '' ? mb_substr($invoiceNo, 0, 50) : $row['invoice_no'],
                'invoice_file' => $invoiceFile !== '' ? mb_substr($invoiceFile, 0, 500) : $row['invoice_file'],
                'audit_msg'    => mb_substr($auditMsg, 0, 255),
                'updatetime'   => $now,
            ];
            if ($status === 'issued') {
                $updateData['issue_time'] = $now;
            }

            // 乐观锁更新状态，防止并发重复处理
            $affected = Db::name('invoice')
                ->where('id', $row['id'])
                ->where('status', $row['status'])
                ->update($updateData);
            if (!$affected) {
                throw new \Exception('开票申请状态已被其他人变更，请刷新后重试');
            }

            if ($status === 'issued') {
                InvoiceService::markInvoiceOrdersIssued((int)$row['id'], (string)$row['order_ids'], $now);
                $msgBody = '您申请的发票 ¥' . number_format((float)$row['amount'], 2, '.', '') . ' 已开具完成，发票号码：' . $invoiceNo;
                if ($invoiceFile !== '') {
                    $msgBody .= '，您可在「开具发票 - 开票记录」中在线预览或下载电子发票';
                }
                if (!empty($row['email'])) {
                    $msgBody .= '（接收邮箱：' . $row['email'] . '）';
                }
                $this->sendUserMessage((int)$row['user_id'], '发票已开具', $msgBody);
            } else {
                InvoiceService::releaseInvoiceOrders((int)$row['id'], (string)$row['order_ids'], $now);
                $this->sendUserMessage(
                    (int)$row['user_id'],
                    '开票申请已驳回',
                    '您的开票申请 ¥' . number_format((float)$row['amount'], 2, '.', '') . ' 未通过审核：' . ($auditMsg !== '' ? $auditMsg : '请核对开票信息后重新提交')
                );
            }

            Db::commit();
        } catch (PDOException|\Exception $e) {
            Db::rollback();
            $this->error($e->getMessage());
        }
        $this->success();
    }

    /**
     * 开票申请仅由用户/商户端发起，禁止后台手工添加
     */
    public function add()
    {
        $this->error('开票申请仅支持用户/商户端发起，后台不可手动添加');
    }

    /**
     * 开票记录禁止删除，保障开票额度统计与账务完整
     */
    public function del($ids = null)
    {
        $this->error('开票申请记录禁止删除');
    }

    /**
     * 禁止批量修改状态，必须逐单填写开票结果
     */
    public function multi($ids = null)
    {
        $this->error('开票处理不支持批量操作，请逐单填写发票号后处理');
    }

    /**
     * 向申请人发送站内消息
     */
    protected function sendUserMessage($userId, $title, $content)
    {
        if (!$userId) {
            return;
        }
        Db::name('message')->insert([
            'receive_type' => 'user',
            'receive_id'   => (int)$userId,
            'type'         => 'system',
            'title'        => mb_substr((string)$title, 0, 100),
            'content'      => mb_substr((string)$content, 0, 500),
            'order_id'     => 0,
            'is_read'      => 0,
            'createtime'   => time(),
        ]);
    }
}