<?php

namespace App\Livewire;

use Livewire\Component;
use Livewire\WithFileUploads;
use App\Models\Student;
use App\Models\OCRRecord;
use App\Services\OCRService;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;

class UploadExamPaper extends Component
{
    use WithFileUploads;

    public $selectedTeacherId = null;
    public $selectedStudentId = null;
    public $image = null;
    public $isUploading = false;
    public $uploadProgress = 0;
    public $uploadMessage = '';
    public $uploadError = '';
    public $uploadSuccess = false;

    public $teachers = [];
    public $students = [];

    protected $rules = [
        'selectedTeacherId' => 'required|exists:teachers,teacher_id',
        'selectedStudentId' => 'required|exists:students,student_id',
        'image' => 'required|image|max:10240', // 10MB
    ];

    protected $messages = [
        'selectedTeacherId.required' => '请选择老师',
        'selectedTeacherId.exists' => '所选老师不存在',
        'selectedStudentId.required' => '请选择学生',
        'selectedStudentId.exists' => '所选学生不存在',
        'image.required' => '请选择要上传的卷子照片',
        'image.image' => '文件必须是图片格式',
        'image.max' => '图片大小不能超过10MB',
    ];

    public function mount()
    {
        $this->loadTeachers();
    }

    public function loadTeachers()
    {
        $this->teachers = DB::table('teachers')
            ->join('users', 'teachers.user_id', '=', 'users.user_id')
            ->select('teachers.teacher_id', 'users.name')
            ->orderBy('users.name')
            ->get()
            ->map(fn ($teacher) => [
                'id' => $teacher->teacher_id,
                'name' => $teacher->name,
            ])
            ->toArray();
    }

    public function updatedSelectedTeacherId($value)
    {
        $this->selectedStudentId = null;
        if ($value) {
            $this->loadStudents($value);
        } else {
            $this->students = [];
        }
    }

    public function loadStudents($teacherId)
    {
        $this->students = DB::table('students')
            ->where('teacher_id', $teacherId)
            ->select('student_id', 'name', 'grade', 'class_name')
            ->orderBy('name')
            ->get()
            ->map(fn ($student) => [
                'id' => $student->student_id,
                'name' => $student->name . " ({$student->grade}-{$student->class_name})",
            ])
            ->toArray();
    }

    public function upload()
    {
        $this->validate();

        $this->isUploading = true;
        $this->uploadError = '';
        $this->uploadSuccess = false;
        $this->uploadProgress = 0;

        try {
            $ocrService = app(OCRService::class);

            $this->uploadProgress = 20;

            // 上传并创建OCR记录
            $ocrRecord = $ocrService->uploadExamPaper($this->image, $this->selectedStudentId);

            $this->uploadProgress = 80;

            $this->uploadProgress = 100;
            $this->uploadMessage = '上传成功！卷子照片已提交OCR识别，系统将自动处理。';
            $this->uploadSuccess = true;

            // 重置表单
            $this->reset(['image', 'selectedTeacherId', 'selectedStudentId']);
            $this->students = [];

        } catch (\Exception $e) {
            $this->uploadError = '上传失败：' . $e->getMessage();
            \Log::error('OCR上传失败', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);
        }

        $this->isUploading = false;
    }

    public function render()
    {
        return view('livewire.upload-exam-paper');
    }
}