<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Program;
use App\Models\ProgramQuestionnaire;
use App\Models\QuestionnaireSet;
use App\Services\AuditLogService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class ProgramQuestionnaireController extends Controller
{
    public function show(Program $program): View
    {
        $pq = $program->questionnaire()->with('questionnaireSet.questions')->first();

        $availableSets = QuestionnaireSet::where('status', 'published')
            ->withCount('questions')
            ->orderBy('title')
            ->get();

        return view('admin.programs.questionnaire.show', compact('program', 'pq', 'availableSets'));
    }

    public function attach(Request $request, Program $program): RedirectResponse
    {
        $data = $request->validate([
            'questionnaire_set_id' => 'required|exists:questionnaire_sets,id',
        ]);

        if ($program->questionnaire()->exists()) {
            return back()->with('error', 'Program ini sudah ada soalselidik dilampirkan. Tanggalkan dahulu sebelum lampir yang baru.');
        }

        $set = QuestionnaireSet::findOrFail($data['questionnaire_set_id']);

        if ($set->status !== 'published') {
            return back()->with('error', 'Hanya soalselidik yang diterbitkan boleh dilampirkan.');
        }

        ProgramQuestionnaire::create([
            'program_id'           => $program->id,
            'questionnaire_set_id' => $set->id,
            'is_confirmed'         => false,
        ]);

        return back()->with('success', 'Soalselidik berjaya dilampirkan. Sila sahkan sebelum program bermula.');
    }

    public function confirm(Request $request, Program $program): RedirectResponse
    {
        $pq = $program->questionnaire;

        if (! $pq) {
            return back()->with('error', 'Tiada soalselidik untuk disahkan.');
        }

        $pq->update([
            'is_confirmed' => true,
            'confirmed_at' => now(),
            'confirmed_by' => auth()->id(),
        ]);

        AuditLogService::log('questionnaire.confirmed', $pq, [], ['program_id' => $program->id, 'questionnaire_set_id' => $pq->questionnaire_set_id]);

        return back()->with('success', 'Soalselidik telah disahkan untuk program ini.');
    }

    public function preview(Program $program): View|\Illuminate\Http\RedirectResponse
    {
        $pq = $program->questionnaire()->with('questionnaireSet')->first();

        if (! $pq || ! $pq->questionnaireSet) {
            return back()->with('error', 'Tiada soalselidik untuk dipratonton.');
        }

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

        return view('admin.programs.questionnaire.preview', compact('program', 'pq', 'questions'));
    }

    public function detach(Program $program): RedirectResponse
    {
        $pq = $program->questionnaire;

        if (! $pq) {
            return back()->with('error', 'Tiada soalselidik untuk ditanggalkan.');
        }

        if ($pq->is_confirmed) {
            $hasResponses = \App\Models\QuestionnaireResponse::where('program_id', $program->id)->exists();
            if ($hasResponses) {
                return back()->with('error', 'Soalselidik tidak boleh ditanggalkan kerana sudah ada respons diterima.');
            }
        }

        $pq->delete();

        return back()->with('success', 'Soalselidik berjaya ditanggalkan.');
    }
}