<?php

namespace App\Http\Controllers;

use App\Models\DataCentre;
use App\Models\ReportingCycle;
use App\Models\Submission;
use App\Services\SubmissionWorkflowService;
use Illuminate\Http\Request;

class SubmissionController extends Controller
{
    public function __construct(protected SubmissionWorkflowService $workflow) {}

    public function index(Request $request)
    {
        $this->authorize('viewAny', Submission::class);

        $user = auth()->user();
        $query = Submission::query()->with(['dataCentre', 'reportingCycle', 'consultant', 'assignedOfficer']);

        // Perunding: hanya serahan sendiri.
        if (! $user->can('serahan.lihat_semua')) {
            $query->where('consultant_id', $user->consultant?->id ?? 0);
        }

        if ($request->filled('cycle')) {
            $query->where('reporting_cycle_id', $request->cycle);
        }
        if ($request->filled('status')) {
            $query->where('status', $request->status);
        }
        if ($request->filled('consultant') && $user->can('serahan.lihat_semua')) {
            $query->where('consultant_id', $request->consultant);
        }

        $submissions = $query->latest()->paginate(15)->withQueryString();
        $cycles = ReportingCycle::orderByDesc('renewal_year')->get();

        return view('submissions.index', compact('submissions', 'cycles'));
    }

    /** Borang pilih pusat data + kitaran untuk memulakan serahan. */
    public function create(Request $request)
    {
        $this->authorize('create', Submission::class);

        $consultant = auth()->user()->consultant;
        abort_unless($consultant, 403, 'Akaun anda tiada profil perunding.');

        $dataCentres = DataCentre::where('current_consultant_id', $consultant->id)->aktif()->get();
        $cycles = ReportingCycle::aktif()->orderByDesc('renewal_year')->get();

        return view('submissions.create', compact('dataCentres', 'cycles'));
    }

    public function store(Request $request)
    {
        $this->authorize('create', Submission::class);

        $consultant = auth()->user()->consultant;
        abort_unless($consultant, 403);

        $data = $request->validate([
            'data_centre_id' => ['required', 'exists:data_centres,id'],
            'reporting_cycle_id' => ['required', 'exists:reporting_cycles,id'],
        ], [], ['data_centre_id' => 'pusat data', 'reporting_cycle_id' => 'kitaran pelaporan']);

        $dataCentre = DataCentre::findOrFail($data['data_centre_id']);

        // Pastikan pusat data ini milik perunding.
        abort_unless((int) $dataCentre->current_consultant_id === (int) $consultant->id, 403,
            'Anda tidak ditugaskan untuk pusat data ini.');

        $cycle = ReportingCycle::findOrFail($data['reporting_cycle_id']);
        $submission = $this->workflow->findOrCreateDraft($dataCentre, $cycle);

        return redirect()->route('submissions.edit', $submission)
            ->with('success', 'Serahan draf disediakan. Sila lengkapkan senarai semak.');
    }

    /** Borang pengisian senarai semak (perunding). */
    public function edit(Submission $submission)
    {
        $this->authorize('update', $submission);

        $submission->load([
            'dataCentre', 'reportingCycle', 'checklistTemplate',
            'answers', 'documents', 'correctionRequests',
        ]);

        $template = $submission->checklistTemplate;
        $template?->load(['sections.scopes', 'sections.items.scope', 'formulas']);

        $answers = $submission->answers->keyBy('checklist_item_id');

        return view('submissions.fill', compact('submission', 'template', 'answers'));
    }

    public function update(Request $request, Submission $submission)
    {
        $this->authorize('update', $submission);

        $answers = $request->input('answers', []);
        $this->workflow->saveAnswers($submission, $answers);

        return back()->with('success', 'Draf senarai semak disimpan.');
    }

    public function submit(Request $request, Submission $submission)
    {
        $this->authorize('update', $submission);

        // Simpan dahulu jawapan terkini jika dihantar bersama.
        if ($request->has('answers')) {
            $this->workflow->saveAnswers($submission, $request->input('answers', []));
        }

        $this->workflow->submit($submission, auth()->user());

        return redirect()->route('submissions.show', $submission)
            ->with('success', 'Serahan berjaya dihantar kepada JPP.');
    }

    public function show(Submission $submission)
    {
        $this->authorize('view', $submission);

        $submission->load([
            'dataCentre', 'reportingCycle', 'consultant', 'assignedOfficer',
            'checklistTemplate.sections.scopes', 'checklistTemplate.sections.items.scope',
            'answers', 'results', 'documents.uploadedBy',
            'statusHistories.changedBy', 'correctionRequests.item', 'correctionRequests.createdBy',
            'comments.user',
        ]);

        $template = $submission->checklistTemplate;
        $answers = $submission->answers->keyBy('checklist_item_id');
        $officers = \App\Models\User::role(['Pegawai JPP', 'Penolong Pegawai', 'Kerani', 'JPP Admin'])->get();

        return view('submissions.show', compact('submission', 'template', 'answers', 'officers'));
    }
}