<?php

namespace App\Http\Controllers;

use App\Models\DocumentType;
use App\Models\Student;
use Illuminate\Http\Request;
use Illuminate\View\View;

class PublicStudentLookupController extends Controller
{
    public function index(Request $request): View
    {
        $query = trim((string) $request->get('q'));
        $students = collect();
        $selectedStudent = null;
        $requiredDocumentSummary = null;
        $matchedBy = null;
        $selectedStudentId = $request->integer('student');

        if ($query !== '') {
            $students = Student::query()
                ->with([
                    'academicYear',
                    'department',
                    'classRoom',
                    'documents.documentType',
                    'achievements',
                ])
                ->where(function ($builder) use ($query) {
                    $builder->where('student_number', 'like', "%{$query}%")
                        ->orWhere('nisn', 'like', "%{$query}%")
                        ->orWhere('full_name', 'like', "%{$query}%");
                })
                ->orderByRaw('CASE WHEN student_number = ? THEN 0 WHEN nisn = ? THEN 1 WHEN full_name = ? THEN 2 ELSE 3 END', [$query, $query, $query])
                ->orderBy('full_name')
                ->limit(10)
                ->get();

            $selectedStudent = $students->firstWhere('id', $selectedStudentId) ?? $students->first();

            if ($selectedStudent) {
                $requiredDocumentSummary = $this->buildRequiredDocumentSummary($selectedStudent);
                $matchedBy = $this->detectMatchedBy($selectedStudent, $query);
            }

            $students->each(function (Student $student) {
                $student->public_photo_url = $this->resolvePhotoUrl($student);
            });
        }

        return view('public.student-lookup', [
            'query' => $query,
            'students' => $students,
            'student' => $selectedStudent,
            'requiredDocumentSummary' => $requiredDocumentSummary,
            'matchedBy' => $matchedBy,
            'selectedStudentId' => $selectedStudent?->id,
        ]);
    }

    protected function detectMatchedBy(Student $student, string $query): ?string
    {
        if ($student->student_number && strcasecmp($student->student_number, $query) === 0) {
            return 'NIS';
        }

        if ($student->nisn && strcasecmp($student->nisn, $query) === 0) {
            return 'NISN';
        }

        return 'Nama';
    }

    protected function resolvePhotoUrl(Student $student): ?string
    {
        $photoDocument = $student->documents
            ->filter(function ($document) {
                $code = strtoupper((string) ($document->documentType?->code ?? ''));
                $name = strtolower((string) ($document->documentType?->name ?? ''));

                return $code === 'PAS_FOTO'
                    || $code === 'PASFOTO'
                    || str_contains($name, 'pas foto')
                    || str_contains($name, 'pasfoto');
            })
            ->sortByDesc('created_at')
            ->first();

        if (! $photoDocument?->file_path) {
            return null;
        }

        return asset('storage/' . $photoDocument->file_path);
    }

    protected function buildRequiredDocumentSummary(Student $student): array
    {
        $requiredTypes = DocumentType::query()
            ->where('is_active', true)
            ->where('is_required', true)
            ->get();

        if ($requiredTypes->isEmpty()) {
            return [
                'total' => 0,
                'uploaded' => 0,
                'verified' => 0,
                'missing' => 0,
                'unverified' => 0,
                'percentage' => 100,
                'verification_percentage' => 100,
                'missing_items' => collect(),
                'unverified_items' => collect(),
            ];
        }

        $documents = $student->documents;

        $uploaded = 0;
        $verified = 0;
        $missingItems = collect();
        $unverifiedItems = collect();

        foreach ($requiredTypes as $type) {
            $matchingDocuments = $documents->where('document_type_id', $type->id);
            $latestDocument = $matchingDocuments->sortByDesc('created_at')->first();

            if (! $latestDocument) {
                $missingItems->push($type->name);
                continue;
            }

            $uploaded++;

            if ($latestDocument->verification_status === 'valid') {
                $verified++;
            } else {
                $unverifiedItems->push($type->name);
            }
        }

        $total = $requiredTypes->count();

        return [
            'total' => $total,
            'uploaded' => $uploaded,
            'verified' => $verified,
            'missing' => max($total - $uploaded, 0),
            'unverified' => max($total - $verified, 0),
            'percentage' => $total > 0 ? (int) round(($uploaded / $total) * 100) : 100,
            'verification_percentage' => $total > 0 ? (int) round(($verified / $total) * 100) : 100,
            'missing_items' => $missingItems,
            'unverified_items' => $unverifiedItems,
        ];
    }
}