<?php

namespace App\Http\Controllers;

use App\Mail\Welcome;
use App\Models\AbandonedCheckout;
use App\Models\Package;
use App\Models\Tenant;
use App\Models\User;
use App\Support\Concerns\PresentsPackages;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Str;
use Illuminate\Validation\Rules\Password;
use Inertia\Inertia;

class CheckoutController extends Controller
{
    use PresentsPackages;

    public function show(Package $package)
    {
        $googleStatus = session()->pull('checkout_google_status');
        $googleError = session()->pull('checkout_google_error');
        $googleProfile = session()->pull('checkout_google_profile');

        $packageOptions = Package::orderBy('price')->get()
            ->map(fn (Package $pkg) => $this->presentPackage($pkg))
            ->values()
            ->all();

        return Inertia::render('marketing/CheckoutWizardPage', [
            'package' => $this->presentPackage($package),
            'packageOptions' => $packageOptions,
            'privacyHtml' => view('legal.datenschutz-partial')->render(),
            'auth' => [
                'user' => Auth::user(),
            ],
            'googleAuth' => [
                'status' => $googleStatus,
                'error' => $googleError,
                'profile' => $googleProfile,
            ],
            'paddle' => [
                'environment' => config('paddle.environment'),
                'client_token' => config('paddle.client_token'),
            ],
        ]);
    }

    public function register(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'email' => 'required|email|unique:users,email',
            'username' => 'required|string|max:255|unique:users,username',
            'password' => ['required', 'confirmed', Password::defaults()],
            'first_name' => 'required|string|max:255',
            'last_name' => 'required|string|max:255',
            'address' => 'required|string|max:500',
            'phone' => 'required|string|max:255',
            'package_id' => 'required|exists:packages,id',
            'terms' => 'required|accepted',
            'privacy_consent' => 'required|accepted',
            'locale' => 'nullable|string|max:10',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'errors' => $validator->errors(),
            ], 422);
        }

        $package = Package::findOrFail($request->package_id);
        $validated = $validator->validated();
        $user = DB::transaction(function () use ($request, $package, $validated) {

            // User erstellen
            $user = User::create([
                'email' => $request->email,
                'username' => $validated['username'],
                'first_name' => $validated['first_name'],
                'last_name' => $validated['last_name'],
                'name' => trim($validated['first_name'].' '.$validated['last_name']),
                'address' => $validated['address'],
                'phone' => $validated['phone'],
                'preferred_locale' => $validated['locale'] ?? null,
                'password' => Hash::make($request->password),
                'pending_purchase' => true,
            ]);

            // Tenant erstellen
            $tenant = Tenant::create([
                'user_id' => $user->id,
                'name' => $validated['first_name'].' '.$validated['last_name'],
                'slug' => Str::slug($validated['first_name'].' '.$validated['last_name'].'-'.now()->timestamp),
                'email' => $validated['email'],
                'is_active' => true,
                'is_suspended' => false,
                'subscription_tier' => 'free',
                'subscription_expires_at' => null,
                'settings' => json_encode([
                    'branding' => [
                        'logo_url' => null,
                        'primary_color' => '#3B82F6',
                        'secondary_color' => '#1F2937',
                        'font_family' => 'Inter, sans-serif',
                    ],
                    'features' => [
                        'photo_likes_enabled' => false,
                        'event_checklist' => false,
                        'custom_domain' => false,
                        'advanced_analytics' => false,
                    ],
                    'custom_domain' => null,
                    'contact_email' => $validated['email'],
                    'event_default_type' => 'general',
                ]),
            ]);

            $user->forceFill(['tenant_id' => $tenant->id])->save();
            // Package zuweisen
            $tenant->packages()->attach($package->id, [
                'price' => $package->price,
                'purchased_at' => now(),
                'expires_at' => $this->packageIsFree($package) ? now()->addYear() : now()->addYear(),
                'active' => $this->packageIsFree($package), // Kostenlose Pakete sofort aktivieren
            ]);

            // E-Mail-Verifizierung senden
            $user->sendEmailVerificationNotification();

            // Willkommens-E-Mail senden
            Mail::to($user)
                ->locale($user->preferred_locale ?? app()->getLocale())
                ->queue(new Welcome($user));

            return $user;
        });

        Auth::login($user);
        $request->session()->put('checkout.pending_package_id', $package->id);
        $redirectUrl = route('checkout.show', ['package' => $package->id]);
        $request->session()->put('checkout.verify_redirect', $redirectUrl);
        $request->session()->put('url.intended', $redirectUrl);

        return response()->json([
            'success' => true,
            'message' => 'Registrierung erfolgreich. Bitte überprüfen Sie Ihre E-Mail zur Verifizierung.',
            'redirect' => $redirectUrl,
            'user' => [
                'id' => $user->id,
                'email' => $user->email,
                'name' => $user->name ?? trim($user->first_name.' '.$user->last_name),
                'pending_purchase' => $user->pending_purchase ?? true,
                'email_verified_at' => $user->email_verified_at,
            ],
            'pending_purchase' => $user->pending_purchase ?? true,
        ]);
    }

    public function login(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'identifier' => 'required|string',
            'password' => 'required|string',
            'remember' => 'boolean',
            'locale' => 'nullable|string',
        ]);

        if ($validator->fails()) {
            return response()->json(['errors' => $validator->errors()], 422);
        }

        $packageId = $request->session()->get('selected_package_id');

        // Custom Auth für Identifier (E-Mail oder Username)
        $identifier = $request->identifier;
        $user = User::where('email', $identifier)
            ->orWhere('username', $identifier)
            ->first();

        if (! $user || ! Hash::check($request->password, $user->password)) {
            return response()->json([
                'errors' => ['identifier' => ['Ungültige Anmeldedaten.']],
            ], 422);
        }

        Auth::login($user, $request->boolean('remember'));
        $request->session()->regenerate();

        // Checkout-spezifische Logik
        DB::transaction(function () use ($request, $user, $packageId) {
            if ($packageId && ! $user->pending_purchase) {
                $user->update(['pending_purchase' => true]);
                $request->session()->put('pending_package_id', $packageId);
            }
        });

        return response()->json([
            'user' => [
                'id' => $user->id,
                'email' => $user->email,
                'name' => $user->name ?? null,
                'pending_purchase' => $user->pending_purchase ?? false,
            ],
            'message' => 'Login erfolgreich',
        ]);
    }

    public function trackAbandonedCheckout(Request $request)
    {
        $validated = $request->validate([
            'package_id' => 'required|exists:packages,id',
            'email' => 'nullable|email',
            'step' => 'nullable|string|in:package,auth,payment,confirmation',
            'checkout_state' => 'nullable|array',
        ]);

        $user = Auth::user();

        if (! $user && ! empty($validated['email'])) {
            $user = User::where('email', $validated['email'])->first();
        }

        if (! $user) {
            return response()->json(['status' => 'skipped'], 202);
        }

        $package = Package::find($validated['package_id']);
        if (! $package) {
            return response()->json(['status' => 'missing_package'], 404);
        }

        $stepMap = [
            'package' => 1,
            'auth' => 2,
            'payment' => 3,
            'confirmation' => 4,
        ];

        $lastStep = $stepMap[$validated['step'] ?? 'package'] ?? 1;

        $checkout = AbandonedCheckout::firstOrNew([
            'user_id' => $user->id,
            'package_id' => $package->id,
        ]);

        $checkout->email = $user->email;
        $checkout->checkout_state = $validated['checkout_state'] ?? [
            'step' => $validated['step'] ?? 'package',
        ];
        $checkout->last_step = $lastStep;
        $checkout->abandoned_at = now();

        if (! $checkout->exists || $checkout->converted) {
            $checkout->reminder_stage = 'none';
            $checkout->reminded_at = null;
        }

        if (! $checkout->expires_at || $checkout->expires_at->isPast()) {
            $checkout->expires_at = now()->addDays(30);
        }

        $checkout->converted = false;
        $checkout->save();

        return response()->json(['status' => 'tracked']);
    }

    private function packageIsFree(Package $package): bool
    {
        if (isset($package->is_free)) {
            return (bool) $package->is_free;
        }

        $price = (float) $package->price;

        return $price <= 0;
    }
}