<?php

namespace Modules\Licensing\Http\Controllers\Admin;

use Illuminate\Contracts\View\View;
use Illuminate\Routing\Controller;
use Modules\Licensing\Models\License;
use Modules\Licensing\Models\LicenseProduct;
use Modules\Licensing\Models\LicenseWebhookEvent;

final class LicensingDashboardController extends Controller
{
    public function index(): View
    {
        return view('licensing::admin.index', [
            'licenseCount' => License::query()->count(),
            'activeCount' => License::query()->whereNull('revoked_at')->where(function ($q): void {
                $q->whereNull('expires_at')->orWhere('expires_at', '>', now());
            })->count(),
            'productCount' => LicenseProduct::query()->count(),
            'recentLicenses' => License::query()->with('product')->latest()->limit(10)->get(),
        ]);
    }

    public function licenses(): View
    {
        return view('licensing::admin.licenses', [
            'licenses' => License::query()->with('product')->latest()->paginate(25),
        ]);
    }

    public function show(License $license): View
    {
        return view('licensing::admin.show', [
            'license' => $license->load(['product', 'activations']),
        ]);
    }

    /** Read-only snapshot of existing licensing subscription metadata. */
    public function subscriptions(): View
    {
        $subscriptions = License::query()
            ->whereNotNull('external_subscription_id')
            ->with('product')
            ->orderByDesc('created_at')
            ->paginate(25);

        $total = License::query()->whereNotNull('external_subscription_id')->count();
        $active = License::query()->whereNotNull('external_subscription_id')
            ->whereIn('subscription_status', ['active', 'trialing'])->count();
        $cancelScheduled = License::query()->whereNotNull('external_subscription_id')
            ->whereNotNull('cancel_scheduled_at')->count();

        return view('licensing::admin.subscriptions', compact('subscriptions', 'total', 'active', 'cancelScheduled'));
    }

    /** Local-only billing integrity audit. Does not contact Paddle or mutate records. */
    public function billingAudit(): View
    {
        $linked = License::query()->whereNotNull('external_subscription_id');

        $duplicateSubscriptions = License::query()
            ->select('payment_provider', 'external_subscription_id')
            ->selectRaw('COUNT(*) AS license_count')
            ->whereNotNull('external_subscription_id')
            ->groupBy('payment_provider', 'external_subscription_id')
            ->havingRaw('COUNT(*) > 1')
            ->orderByDesc('license_count')
            ->limit(25)
            ->get();

        $duplicateEvents = LicenseWebhookEvent::query()
            ->select('provider', 'external_event_id')
            ->selectRaw('COUNT(*) AS event_count')
            ->whereNotNull('external_event_id')
            ->groupBy('provider', 'external_event_id')
            ->havingRaw('COUNT(*) > 1')
            ->orderByDesc('event_count')
            ->limit(25)
            ->get();

        return view('licensing::admin.billing-audit', [
            'linkedCount' => (clone $linked)->count(),
            'missingProvider' => (clone $linked)->whereNull('payment_provider')->count(),
            'missingCustomer' => (clone $linked)->whereNull('external_customer_id')->count(),
            'missingStatus' => (clone $linked)->whereNull('subscription_status')->count(),
            'eventCount' => LicenseWebhookEvent::query()->count(),
            'unprocessedEvents' => LicenseWebhookEvent::query()->whereNull('processed_at')->count(),
            'failedEvents' => LicenseWebhookEvent::query()->whereNotNull('processing_error')->count(),
            'duplicateSubscriptions' => $duplicateSubscriptions,
            'duplicateEvents' => $duplicateEvents,
            'recentFailures' => LicenseWebhookEvent::query()
                ->whereNotNull('processing_error')->latest()->limit(15)
                ->get(['id', 'provider', 'external_event_id', 'event_type', 'processing_error', 'created_at']),
        ]);
    }

}