<?php

namespace App\Http\Controllers;

use App\Models\AcademicYear;
use App\Models\Department;
use App\Models\SchoolClass;
use App\Models\StudentTransfer;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\View\View;
use RealRashid\SweetAlert\Facades\Alert;

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

        $studentTransfersQuery = StudentTransfer::query()
            ->with(['academicYear', 'department', 'classRoom'])
            ->when($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', $academicYearId))
            ->when($departmentId, fn ($query) => $query->where('department_id', $departmentId))
            ->when($classId, fn ($query) => $query->where('class_id', $classId));

        $studentTransfers = (clone $studentTransfersQuery)
            ->latest('transfer_date')
            ->latest('id')
            ->paginate(10)
            ->withQueryString();

        $totalTransfers = StudentTransfer::count();
        $withLetterCount = StudentTransfer::query()->whereNotNull('transfer_letter_file_path')->count();
        $withoutLetterCount = max($totalTransfers - $withLetterCount, 0);
        $thisYearCount = StudentTransfer::query()->whereYear('transfer_date', now()->year)->count();
        $latestTransferDate = StudentTransfer::query()->max('transfer_date');
        $recentTransfers = StudentTransfer::query()
            ->latest('transfer_date')
            ->latest('id')
            ->limit(3)
            ->get(['id', 'full_name', 'transfer_date', 'department_id', 'class_id']);

        return view('student-transfers.index', [
            'studentTransfers' => $studentTransfers,
            'search' => $search,
            'filters' => [
                'academic_year_id' => $academicYearId,
                'department_id' => $departmentId,
                'class_id' => $classId,
            ],
            'academicYears' => AcademicYear::orderBy('name')->pluck('name', 'id'),
            'departments' => Department::orderBy('name')->pluck('name', 'id'),
            'classes' => SchoolClass::orderBy('name')->pluck('name', 'id'),
            'summary' => [
                'total' => $totalTransfers,
                'with_letter' => $withLetterCount,
                'without_letter' => $withoutLetterCount,
                'this_year' => $thisYearCount,
                'latest_transfer_date' => $latestTransferDate,
                'filtered' => $studentTransfers->total(),
            ],
            'recentTransfers' => $recentTransfers,
        ]);
    }

    public function show(StudentTransfer $studentTransfer): View
    {
        $studentTransfer->load(['academicYear', 'department', 'classRoom']);

        return view('student-transfers.show', [
            'studentTransfer' => $studentTransfer,
        ]);
    }

    public function update(Request $request, StudentTransfer $studentTransfer): RedirectResponse
    {
        $validated = $request->validate([
            'transfer_date' => ['nullable', 'date'],
            'transfer_reason' => ['nullable', 'string'],
            'transfer_letter' => ['nullable', 'file', 'mimes:pdf,jpg,jpeg,png', 'max:2048'],
        ], [
            'transfer_letter.mimes' => 'Surat pindah harus berupa file PDF, JPG, JPEG, atau PNG.',
            'transfer_letter.max' => 'Ukuran surat pindah maksimal 2 MB.',
        ]);

        $studentTransfer->transfer_date = $validated['transfer_date'] ?? $studentTransfer->transfer_date;
        $studentTransfer->transfer_reason = $validated['transfer_reason'] ?? $studentTransfer->transfer_reason;

        if ($request->hasFile('transfer_letter')) {
            if ($studentTransfer->transfer_letter_file_path && Storage::disk('public')->exists($studentTransfer->transfer_letter_file_path)) {
                Storage::disk('public')->delete($studentTransfer->transfer_letter_file_path);
            }

            $file = $request->file('transfer_letter');
            $path = $file->store("student-transfer-letters/{$studentTransfer->student_id}", 'public');

            $studentTransfer->transfer_letter_file_name = $file->getClientOriginalName();
            $studentTransfer->transfer_letter_file_path = $path;
            $studentTransfer->transfer_letter_mime_type = $file->getMimeType();
            $studentTransfer->transfer_letter_file_size = $file->getSize();
        }

        $studentTransfer->save();

        Alert::success('Berhasil', 'Arsip siswa mutasi berhasil diperbarui.');

        return redirect()->route('student-transfers.show', $studentTransfer)->with('success', 'Arsip siswa mutasi berhasil diperbarui.');
    }

    public function previewLetter(StudentTransfer $studentTransfer): View
    {
        abort_unless($studentTransfer->transfer_letter_file_path && Storage::disk('public')->exists($studentTransfer->transfer_letter_file_path), 404);

        $mimeType = $studentTransfer->transfer_letter_mime_type ?: Storage::disk('public')->mimeType($studentTransfer->transfer_letter_file_path);
        $fileUrl = asset('storage/' . $studentTransfer->transfer_letter_file_path);
        $isImage = str_starts_with((string) $mimeType, 'image/');
        $isPdf = $mimeType === 'application/pdf';

        return view('student-transfers.preview-letter', [
            'studentTransfer' => $studentTransfer,
            'fileUrl' => $fileUrl,
            'mimeType' => $mimeType,
            'isImage' => $isImage,
            'isPdf' => $isPdf,
        ]);
    }
}