<?php
namespace app\common\utils\pdf\service\document;

use app\common\utils\pdf\service\PdfGeneratorService;
use Exception;

class ReimbursementDocumentService
{
    private $pdfGenerator;

    public function __construct()
    {
        $this->pdfGenerator = new PdfGeneratorService();
    }

    /**
     * 根据报销单 ID 生成 PDF 数据
     * （这里模拟从数据库获取数据）
     *
     * @param int $reimbursementId
     * @return string PDF 二进制数据
     * @throws Exception
     */
    public function generatePdfById(int $reimbursementId): string
    {
        // --- 模拟从数据库获取数据 ---
        // 实际应用中，这里应该是查询数据库
        $reimbursementData = $this->getMockReimbursementData($reimbursementId);

        if (!$reimbursementData) {
             throw new Exception("Reimbursement record not found for ID: {$reimbursementId}");
        }
        // --- 数据获取结束 ---

        // 调用核心 PDF 服务生成 PDF
        // 'reimbursement_template' 对应 app/view/pdf/reimbursement_template.php
        return $this->pdfGenerator->generate('reimbursement', $reimbursementData);
    }

    /**
     * 模拟获取报销单数据
     * @param int $id
     * @return array|null
     */
    private function getMockReimbursementData(int $id)
    {
        if ($id <= 0) return null;

        return [
            'reimbursement_id' => 'REIM-' . str_pad($id, 5, '0', STR_PAD_LEFT),
            'applicant_name' => '张三',
            'department' => '技术部',
            'application_date' => '2023-10-26',
            'total_amount' => 1250.75,
            'reason' => "参加北京技术研讨会的差旅费用。\n包括交通、住宿和餐饮。",
            'items' => [
                ['date' => '2023-10-20', 'category' => '交通费', 'description' => '高铁二等座', 'amount' => 520.00, 'remark' => ''],
                ['date' => '2023-10-21', 'category' => '住宿费', 'description' => 'XX酒店 2 晚', 'amount' => 680.00, 'remark' => '含早餐'],
                ['date' => '2023-10-21', 'category' => '餐饮费', 'description' => '午餐晚餐', 'amount' => 50.75, 'remark' => '发票已附'],
            ]
        ];
    }

    /**
     * 保存报销单 PDF 到服务器
     * @param int $reimbursementId
     * @param string $savePath 保存路径 (目录)
     * @throws Exception
     */
    public function savePdfToFile(int $reimbursementId, string $savePath)
    {
        $reimbursementData = $this->getMockReimbursementData($reimbursementId);
        if (!$reimbursementData) {
            throw new Exception("Reimbursement record not found for ID: {$reimbursementId}");
        }

        $filename = 'reimbursement_' . $reimbursementData['reimbursement_id'] . '_' . date('Ymd_His') . '.pdf';
        $fullPath = rtrim($savePath, '/') . '/' . $filename;

        $this->pdfGenerator->saveToFile('reimbursement_template', $reimbursementData, $fullPath);
    }
}