<?php

namespace App\Filament\Resources\AttendancesResource\Pages;

use App\Filament\Resources\AttendancesResource;
use App\Models\Attendances;
use App\Models\ClassRoom;
use App\Models\Student;
use App\Models\TeacherSubject;
use Filament\Actions;
use Filament\Forms\Components\DatePicker;
use Filament\Forms\Components\Select;
use Filament\Forms\Form;
use Filament\Notifications\Notification;
use Filament\Resources\Pages\Page;
use Illuminate\Support\Facades\DB;

class MultipleAttendances extends Page
{
    protected static string $resource = AttendancesResource::class;
    protected static string $view = 'filament.resources.attendances-resource.pages.multiple-attendances';

    public ?array $data = [];
    public $classroomId;
    public $teacherSubjectId;

    public $teacherSubject;
    public $attendanceDate;
    public $semester = 'first'; // Default semester
    public $students = [];

    public function mount(): void
    {
        $this->form->fill([
            'date' => now()->format('Y-m-d'),
            'semester' => 'first',
        ]);
        $this->attendanceDate = now()->format('Y-m-d');
    }

    public function form(Form $form): Form
    {
        return $form
            ->schema([
                Select::make('teacher_subject_id')
                    ->label('Teacher Subject')
                    ->required()
                    ->options(TeacherSubject::with(['teacher', 'subject', 'class'])
                        ->get()
                        ->mapWithKeys(fn ($item) => [
                            $item->id => $item->teacher->name . ' - ' . $item->subject->name . ' - ' . $item->class->class_name
                        ]))
                    ->searchable()
                    ->live()
                    ->afterStateUpdated(function ($state) {
                        $this->teacherSubjectId = $state;
                        $this->loadStudents();
                    }),

                DatePicker::make('date')
                    ->label('Attendance Date')
                    ->required()
                    ->default(now())
                    ->maxDate(now())
                    ->live()
                    ->afterStateUpdated(function ($state) {
                        $this->attendanceDate = $state;
                        $this->loadStudents();
                    }),

                Select::make('semester')
                    ->label('Semester')
                    ->required()
                    ->options([
                        'first' => 'First Semester',
                        'second' => 'Second Semester'
                    ])
                    ->live()
                    ->afterStateUpdated(function ($state) {
                        $this->semester = $state;
                        $this->loadStudents();
                    }),
            ])
            ->statePath('data');
    }

    protected function loadStudents(): void
    {
        if (!$this->attendanceDate || !$this->teacherSubjectId) {
            $this->students = [];
            return;
        }

        $this->teacherSubject = TeacherSubject::where('id', $this->teacherSubjectId)->firstOrFail();

        $this->students = Student::where('class_id', $this->teacherSubject->class_id)
            ->orderBy('full_name')
            ->get()
            ->map(function ($student) {
                $existingAttendance = Attendances::where('student_id', $student->id)
                    ->where('teacher_subject_id', $this->teacherSubjectId)
                    ->whereDate('date', $this->attendanceDate)
                    ->where('semester', $this->semester)
                    ->first();

                return [
                    'id' => $student->id,
                    'name' => $student->full_name,
                    'nis' => $student->nis,
                    'status' => $existingAttendance ? $existingAttendance->status : null,
                    'attendance_id' => $existingAttendance ? $existingAttendance->id : null,
                ];
            })
            ->toArray();
    }

    public function markAll($status): void
    {
        foreach ($this->students as $key => $student) {
            $this->students[$key]['status'] = $status;
        }
    }

    public function submit(): void
    {
        DB::transaction(function () {
            foreach ($this->students as $student) {
                if ($student['status']) {
                    if ($student['attendance_id']) {
                        // Update existing attendance
                        Attendances::where('id', $student['attendance_id'])
                            ->update([
                                'status' => $student['status'],
                                'recorded_by' => auth()->id(),
                            ]);
                    } else {
                        // Create new attendance
                        Attendances::create([
                            'student_id' => $student['id'],
                            'teacher_subject_id' => $this->teacherSubject->id,
                            'date' => $this->attendanceDate,
                            'status' => $student['status'],
                            'semester' => $this->semester,
                            'recorded_by' => auth()->id(),
                        ]);
                    }
                }
            }
        });

        Notification::make()
            ->title('Attendance saved successfully ' . $this->teacherSubject->id)
            ->success()
            ->send();

        $this->loadStudents();
    }

    protected function getHeaderActions(): array
    {
        return [
            Actions\Action::make('back')
                ->label('Back to Attendances')
                ->url(static::getResource()::getUrl('index')),
        ];
    }
}