<?php

namespace App\Http\Controllers\Qr;

use App\Http\Controllers\Controller;
use App\Models\Campaign;
use App\Models\QrCode;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;
use Illuminate\View\View;

class CampaignController extends Controller
{
    public function index(Request $request): View
    {
        $account = ladill_account();

        $campaigns = Campaign::query()
            ->where('user_id', $account->id)
            ->withCount('qrCodes')
            ->withSum('qrCodes', 'scans_total')
            ->latest()
            ->paginate(20)
            ->withQueryString();

        $base = Campaign::query()->where('user_id', $account->id);

        return view('qr.campaigns.index', [
            'campaigns' => $campaigns,
            'campaignCount' => (clone $base)->count(),
            'activeCount' => (clone $base)->where('status', Campaign::STATUS_ACTIVE)->count(),
            'codesInCampaigns' => QrCode::query()
                ->where('user_id', $account->id)
                ->whereNotNull('campaign_id')
                ->count(),
        ]);
    }

    public function create(): View
    {
        return view('qr.campaigns.create', [
            'campaign' => new Campaign(['status' => Campaign::STATUS_ACTIVE]),
        ]);
    }

    public function store(Request $request): RedirectResponse
    {
        $account = ladill_account();
        $data = $this->validated($request);

        $campaign = Campaign::create([
            ...$data,
            'user_id' => $account->id,
        ]);

        return redirect()
            ->route('qr.campaigns.show', $campaign)
            ->with('success', 'Campaign created.');
    }

    public function show(Campaign $campaign): View
    {
        $this->authorizeCampaign($campaign);

        $codes = $campaign->qrCodes()->latest()->get();
        $availableCodes = QrCode::query()
            ->where('user_id', $campaign->user_id)
            ->where(function ($q) use ($campaign) {
                $q->whereNull('campaign_id')->orWhere('campaign_id', $campaign->id);
            })
            ->orderBy('label')
            ->get();

        return view('qr.campaigns.show', [
            'campaign' => $campaign,
            'codes' => $codes,
            'availableCodes' => $availableCodes,
            'totalScans' => (int) $codes->sum('scans_total'),
        ]);
    }

    public function update(Request $request, Campaign $campaign): RedirectResponse
    {
        $this->authorizeCampaign($campaign);
        $campaign->update($this->validated($request));

        return back()->with('success', 'Campaign updated.');
    }

    public function destroy(Campaign $campaign): RedirectResponse
    {
        $this->authorizeCampaign($campaign);

        QrCode::query()
            ->where('campaign_id', $campaign->id)
            ->update(['campaign_id' => null]);

        $campaign->delete();

        return redirect()
            ->route('qr.campaigns.index')
            ->with('success', 'Campaign deleted. QR codes were unassigned, not removed.');
    }

    public function attach(Request $request, Campaign $campaign): RedirectResponse
    {
        $this->authorizeCampaign($campaign);

        $validated = $request->validate([
            'qr_code_ids' => ['required', 'array', 'min:1'],
            'qr_code_ids.*' => ['integer'],
        ]);

        QrCode::query()
            ->where('user_id', $campaign->user_id)
            ->whereIn('id', $validated['qr_code_ids'])
            ->update(['campaign_id' => $campaign->id]);

        return back()->with('success', 'QR codes added to campaign.');
    }

    public function detach(Campaign $campaign, QrCode $qrCode): RedirectResponse
    {
        $this->authorizeCampaign($campaign);
        abort_unless((int) $qrCode->user_id === (int) $campaign->user_id, 403);
        abort_unless((int) $qrCode->campaign_id === (int) $campaign->id, 404);

        $qrCode->update(['campaign_id' => null]);

        return back()->with('success', 'QR code removed from campaign.');
    }

    /** @return array<string, mixed> */
    private function validated(Request $request): array
    {
        $data = $request->validate([
            'name' => ['required', 'string', 'max:120'],
            'description' => ['nullable', 'string', 'max:2000'],
            'status' => ['required', Rule::in(array_keys(Campaign::STATUSES))],
            'starts_at' => ['nullable', 'date'],
            'ends_at' => ['nullable', 'date', 'after_or_equal:starts_at'],
        ]);

        $data['description'] = $data['description'] ?? null;
        $data['starts_at'] = $data['starts_at'] ?? null;
        $data['ends_at'] = $data['ends_at'] ?? null;

        return $data;
    }

    private function authorizeCampaign(Campaign $campaign): void
    {
        abort_unless((int) $campaign->user_id === (int) ladill_account()->id, 403);
    }
}