<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\QuestionnaireSet;
use Illuminate\Http\Request;
use Illuminate\Http\RedirectResponse;
use Illuminate\View\View;

class QuestionnaireSetController extends Controller
{
    public function index(Request $request): View
    {
        $query = QuestionnaireSet::withCount('questions')
            ->with('creator')
            ->latest();

        if ($request->filled('q')) {
            $query->where('title', 'like', '%' . $request->q . '%');
        }

        if ($request->filled('status')) {
            $query->where('status', $request->status);
        }

        $sets = $query->paginate(20)->withQueryString();

        return view('admin.questionnaires.index', compact('sets'));
    }

    public function create(): View
    {
        return view('admin.questionnaires.create');
    }

    public function store(Request $request): RedirectResponse
    {
        $data = $request->validate([
            'title'       => 'required|string|max:255',
            'description' => 'nullable|string|max:1000',
        ]);

        $data['created_by'] = auth()->id();
        $data['status']     = 'draft';

        $set = QuestionnaireSet::create($data);

        return redirect()->route('admin.questionnaires.show', $set)
            ->with('success', 'Set soalselidik berjaya dicipta.');
    }

    public function show(QuestionnaireSet $set): View
    {
        $set->load('creator');

        $topLevel = $set->questions()
            ->whereNull('parent_id')
            ->with(['children' => fn($q) => $q->orderBy('sort_order')])
            ->orderBy('sort_order')
            ->get();

        $totalCount  = $set->questions()->count();
        $usedInPrograms = $set->programs()->get();

        return view('admin.questionnaires.show', compact('set', 'topLevel', 'totalCount', 'usedInPrograms'));
    }

    public function edit(QuestionnaireSet $set): View
    {
        return view('admin.questionnaires.edit', compact('set'));
    }

    public function update(Request $request, QuestionnaireSet $set): RedirectResponse
    {
        $data = $request->validate([
            'title'       => 'required|string|max:255',
            'description' => 'nullable|string|max:1000',
        ]);

        $set->update($data);

        return redirect()->route('admin.questionnaires.show', $set)
            ->with('success', 'Set soalselidik berjaya dikemaskini.');
    }

    public function destroy(QuestionnaireSet $set): RedirectResponse
    {
        $confirmed = $set->programQuestionnaires()->where('is_confirmed', true)->exists();

        if ($confirmed) {
            return back()->with('error', 'Soalselidik ini tidak boleh dipadam kerana sudah disahkan untuk program.');
        }

        $set->delete();

        return redirect()->route('admin.questionnaires.index')
            ->with('success', 'Set soalselidik berjaya dipadam.');
    }

    public function publish(QuestionnaireSet $set): RedirectResponse
    {
        if ($set->questions()->count() === 0) {
            return back()->with('error', 'Tambah sekurang-kurangnya satu soalan sebelum menerbitkan.');
        }

        $set->update(['status' => 'published']);

        return back()->with('success', 'Set soalselidik diterbitkan.');
    }

    public function archive(QuestionnaireSet $set): RedirectResponse
    {
        $set->update(['status' => 'archived']);

        return back()->with('success', 'Set soalselidik diarkibkan.');
    }
}