<?php

namespace App\Http\Controllers;

use App\Models\AcademicYear;
use App\Models\StudentAcademicHistory;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\Rule;
use Illuminate\View\View;
use RealRashid\SweetAlert\Facades\Alert;

class AcademicYearController extends Controller
{
    public function index(Request $request): View
    {
        $search = trim((string) $request->get('search'));

        $academicYears = AcademicYear::withCount(['classes', 'students'])
            ->when($search !== '', function ($query) use ($search) {
                $query->where('name', 'like', "%{$search}%")
                    ->orWhere('start_year', 'like', "%{$search}%")
                    ->orWhere('end_year', 'like', "%{$search}%");
            })
            ->latest()
            ->paginate(10)
            ->withQueryString();

        return view('academic-years.index', compact('academicYears', 'search'));
    }

    public function create(): View
    {
        return view('academic-years.create');
    }

    public function store(Request $request): RedirectResponse
    {
        $data = $request->validate([
            'name' => ['required', 'string', 'max:50', 'unique:academic_years,name'],
            'start_year' => ['required', 'integer', 'digits:4'],
            'end_year' => ['required', 'integer', 'digits:4', 'gte:start_year'],
            'is_active' => ['nullable', 'boolean'],
        ]);

        $data['is_active'] = $request->boolean('is_active');

        if ($data['is_active']) {
            AcademicYear::query()->update(['is_active' => false]);
        }

        AcademicYear::create($data);

        return redirect()->route('academic-years.index')->with('success', 'Tahun angkatan berhasil ditambahkan.');
    }

    public function show(AcademicYear $academicYear): RedirectResponse
    {
        return redirect()->route('academic-years.edit', $academicYear);
    }

    public function edit(AcademicYear $academicYear): View
    {
        return view('academic-years.edit', [
            'academicYear' => $academicYear,
        ]);
    }

    public function update(Request $request, AcademicYear $academicYear): RedirectResponse
    {
        $data = $request->validate([
            'name' => ['required', 'string', 'max:50', Rule::unique('academic_years', 'name')->ignore($academicYear->id)],
            'start_year' => ['required', 'integer', 'digits:4'],
            'end_year' => ['required', 'integer', 'digits:4', 'gte:start_year'],
            'is_active' => ['nullable', 'boolean'],
        ]);

        $data['is_active'] = $request->boolean('is_active');

        if ($data['is_active']) {
            AcademicYear::whereKeyNot($academicYear->id)->update(['is_active' => false]);
        }

        $academicYear->update($data);

        return redirect()->route('academic-years.index')->with('success', 'Tahun angkatan berhasil diperbarui.');
    }

    public function destroy(AcademicYear $academicYear): RedirectResponse
    {
        $academicYear->loadCount('students');
        $classesWithStudentsCount = $academicYear->classes()->withCount('students')->get()->where('students_count', '>', 0)->count();
        $emptyClassesCount = $academicYear->classes()->withCount('students')->get()->where('students_count', 0)->count();

        if ($academicYear->students_count > 0 || $classesWithStudentsCount > 0) {
            Alert::error('Tidak bisa dihapus', 'Tahun angkatan ini masih digunakan oleh data siswa aktif atau kelas yang masih berisi siswa.');

            return redirect()->route('academic-years.index')->withErrors([
                'delete' => 'Tahun angkatan tidak bisa dihapus karena masih digunakan oleh data siswa aktif atau kelas yang masih berisi siswa.',
            ]);
        }

        DB::transaction(function () use ($academicYear) {
            $classIds = $academicYear->classes()->pluck('id');

            StudentAcademicHistory::query()
                ->whereIn('class_id', $classIds)
                ->delete();

            $academicYear->classes()->delete();
            $academicYear->delete();
        });

        $message = $emptyClassesCount > 0
            ? "Tahun angkatan berhasil dihapus beserta {$emptyClassesCount} kelas kosong terkait."
            : 'Tahun angkatan berhasil dihapus.';

        Alert::success('Berhasil', $message);

        return redirect()->route('academic-years.index')->with('success', $message);
    }
}