<?php

namespace App\Http\Controllers\Api\V1\Qr;

use App\Http\Controllers\Api\V1\ApiController;
use App\Http\Resources\QrCodeResource;
use App\Models\Household;
use App\Models\QrCode;
use App\Services\Qr\QrAllocator;
use App\States\QrCode\Active;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class MyQrCodeController extends ApiController
{
    public function index(Request $request): JsonResponse
    {
        $request->validate([
            'status' => ['nullable', 'in:unassigned,allocated,active,used,expired,voided'],
            'per_page' => ['nullable', 'integer', 'min:1', 'max:100'],
        ]);

        $household = Household::where('head_user_id', $request->user()->id)->first();
        if (! $household) {
            return $this->ok([], 'No household yet');
        }

        $perPage = (int) $request->input('per_page', 50);

        $codes = QrCode::query()
            ->where('assigned_to_household_id', $household->id)
            ->when($request->filled('status'), fn ($q) => $q->where('status', $request->string('status')))
            ->orderByDesc('id')
            ->paginate($perPage);

        return $this->ok(
            QrCodeResource::collection($codes),
            null,
            [
                'page' => $codes->currentPage(),
                'per_page' => $codes->perPage(),
                'total' => $codes->total(),
            ],
        );
    }

    public function balance(Request $request): JsonResponse
    {
        $household = Household::where('head_user_id', $request->user()->id)->first();
        if (! $household) {
            return $this->ok([
                'active' => 0, 'allocated' => 0, 'used' => 0, 'expired' => 0,
                'low_balance' => false,
            ]);
        }

        $counts = QrCode::query()
            ->where('assigned_to_household_id', $household->id)
            ->selectRaw('status, COUNT(*) as count')
            ->groupBy('status')
            ->pluck('count', 'status')
            ->all();

        $active = (int) ($counts['active'] ?? 0);
        $threshold = (int) config('qr.low_balance_threshold', 5);

        return $this->ok([
            'active' => $active,
            'allocated' => (int) ($counts['allocated'] ?? 0),
            'used' => (int) ($counts['used'] ?? 0),
            'expired' => (int) ($counts['expired'] ?? 0),
            'low_balance' => $active <= $threshold,
            'low_balance_threshold' => $threshold,
        ]);
    }

    public function activate(Request $request, QrCode $qrCode, QrAllocator $allocator): JsonResponse
    {
        $request->validate([
            'activate_batch' => ['nullable', 'boolean'],
        ]);

        $household = Household::where('head_user_id', $request->user()->id)->first();
        if (! $household) {
            return $this->forbidden('You must have an active household');
        }

        $activateBatch = $request->boolean('activate_batch');

        if ($activateBatch) {
            // Activate the whole batch
            if (! $qrCode->batch_id) {
                return $this->fail('This QR code does not belong to a batch', null, 422);
            }

            $activatedCount = $allocator->activateBatch($qrCode, $household);
            if ($activatedCount === 0) {
                return $this->fail('No unactivated codes found in this batch, or you do not have permission to activate this batch', null, 422);
            }

            return $this->ok(['activated_count' => $activatedCount], "Successfully activated $activatedCount QR codes in the batch");
        }

        // Single code activation
        if ($qrCode->assigned_to_household_id !== $household->id) {
            return $this->forbidden('This code is not assigned to your household');
        }

        if ($qrCode->status instanceof Active) {
            return $this->ok(new QrCodeResource($qrCode), 'Code already active');
        }

        if (! $allocator->activate($qrCode)) {
            return $this->fail('Code cannot be activated from its current state', null, 422);
        }

        return $this->ok(new QrCodeResource($qrCode->fresh()), 'Code activated');
    }
}