<?php

namespace App\Http\Controllers;

use App\Models\AcademicYear;
use App\Models\SchoolClass;
use App\Models\Student;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Str;
use Illuminate\View\View;
use RealRashid\SweetAlert\Facades\Alert;

class StudentSelfServiceController extends Controller
{
    public function index(Request $request): View
    {
        $search = trim((string) $request->get('search'));
        $academicYearId = $request->get('academic_year_id');
        $classId = $request->get('class_id');
        $status = $request->get('status');

        $students = Student::query()
            ->with(['academicYear', 'classRoom', 'department'])
            ->when($search !== '', function ($query) use ($search) {
                $query->where(function ($subQuery) use ($search) {
                    $subQuery->where('full_name', 'like', "%{$search}%")
                        ->orWhere('student_number', 'like', "%{$search}%")
                        ->orWhere('nisn', 'like', "%{$search}%");
                });
            })
            ->when($academicYearId, fn ($query) => $query->where('academic_year_id', $academicYearId))
            ->when($classId, fn ($query) => $query->where('class_id', $classId))
            ->when($status, fn ($query) => $query->where('self_service_status', $status))
            ->latest()
            ->paginate(15)
            ->withQueryString();

        $summaryBaseQuery = Student::query();
        $statusLabels = [
            'not_started' => 'Belum Mulai',
            'draft' => 'Draft',
            'submitted' => 'Sudah Dikirim',
        ];

        return view('student-self-service.index', [
            'students' => $students,
            'search' => $search,
            'filters' => [
                'academic_year_id' => $academicYearId,
                'class_id' => $classId,
                'status' => $status,
            ],
            'academicYears' => AcademicYear::orderBy('name')->pluck('name', 'id'),
            'classes' => SchoolClass::orderBy('name')->pluck('name', 'id'),
            'statuses' => $statusLabels,
            'summary' => [
                'total' => (clone $summaryBaseQuery)->count(),
                'not_started' => (clone $summaryBaseQuery)->where('self_service_status', 'not_started')->count(),
                'draft' => (clone $summaryBaseQuery)->where('self_service_status', 'draft')->count(),
                'submitted' => (clone $summaryBaseQuery)->where('self_service_status', 'submitted')->count(),
                'with_code' => (clone $summaryBaseQuery)->whereNotNull('self_service_access_code')->count(),
                'without_code' => (clone $summaryBaseQuery)->whereNull('self_service_access_code')->count(),
            ],
        ]);
    }

    public function generateMissingCodes(): RedirectResponse
    {
        $students = Student::query()->whereNull('self_service_access_code')->get();

        if ($students->isEmpty()) {
            Alert::info('Tidak ada perubahan', 'Semua siswa sudah memiliki kode akses.');

            return redirect()->route('student-self-service.index')->with('success', 'Semua siswa sudah memiliki kode akses.');
        }

        foreach ($students as $student) {
            $student->forceFill([
                'self_service_access_code' => $this->generateUniqueCode(),
                'self_service_code_generated_at' => now(),
            ])->save();
        }

        Alert::success('Berhasil', $students->count() . ' kode akses berhasil digenerate.');

        return redirect()->route('student-self-service.index')->with('success', $students->count() . ' kode akses berhasil digenerate.');
    }

    public function regenerateAllCodes(): RedirectResponse
    {
        $students = Student::query()->get();

        foreach ($students as $student) {
            $student->forceFill([
                'self_service_access_code' => $this->generateUniqueCode(),
                'self_service_code_generated_at' => now(),
            ])->save();
        }

        Alert::success('Berhasil', 'Semua kode akses siswa berhasil direset dan digenerate ulang.');

        return redirect()->route('student-self-service.index')->with('success', 'Semua kode akses siswa berhasil direset dan digenerate ulang.');
    }

    public function regenerateStudentCode(Student $student): RedirectResponse
    {
        $student->forceFill([
            'self_service_access_code' => $this->generateUniqueCode(),
            'self_service_code_generated_at' => now(),
        ])->save();

        Alert::success('Berhasil', 'Kode akses untuk ' . $student->full_name . ' berhasil digenerate ulang.');

        return redirect()->route('student-self-service.index')->with('success', 'Kode akses untuk ' . $student->full_name . ' berhasil digenerate ulang.');
    }

    public function exportClassCodes(Request $request): View|RedirectResponse
    {
        $validated = $request->validate([
            'class_id' => ['required', 'exists:classes,id'],
        ], [
            'class_id.required' => 'Pilih kelas terlebih dahulu sebelum export kode.',
        ]);

        $class = SchoolClass::with(['academicYear', 'department'])->findOrFail($validated['class_id']);
        $students = Student::query()
            ->with(['classRoom'])
            ->where('class_id', $class->id)
            ->orderBy('full_name')
            ->get();

        if ($students->isEmpty()) {
            return redirect()->route('student-self-service.index', ['class_id' => $class->id])
                ->withErrors(['class_id' => 'Kelas terpilih belum memiliki data siswa.']);
        }

        $studentsWithoutCode = $students->filter(fn (Student $student) => blank($student->self_service_access_code));

        foreach ($studentsWithoutCode as $student) {
            $student->forceFill([
                'self_service_access_code' => $this->generateUniqueCode(),
                'self_service_code_generated_at' => now(),
            ])->save();
        }

        $students = Student::query()
            ->where('class_id', $class->id)
            ->orderBy('full_name')
            ->get();

        return view('student-self-service.export-class-codes', [
            'class' => $class,
            'students' => $students,
            'generatedCount' => $studentsWithoutCode->count(),
        ]);
    }

    protected function generateUniqueCode(): string
    {
        $characters = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';

        do {
            $code = collect(range(1, 4))
                ->map(fn () => $characters[random_int(0, strlen($characters) - 1)])
                ->implode('');
        } while (Student::where('self_service_access_code', $code)->exists());

        return $code;
    }
}