<?php

namespace App\Http\Controllers;

use App\Models\Plan;
use App\Models\User;
use App\Services\Payments\PaymentOrchestrator;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;

class PaymentController extends Controller
{
    public function __construct(
        private PaymentOrchestrator $orchestrator
    ) {}

    /**
     * Create a checkout session for a plan
     */
    public function createCheckout(Request $request): JsonResponse
    {
        try {
            $validated = $request->validate([
                'plan_id' => 'required|exists:plans,id',
                'provider' => 'nullable|string|in:stripe,lemon_squeezy,polar,oxapay,crypto,activation_key',
                'options' => 'nullable|array',
            ]);

            $user = $request->user();
            $plan = Plan::findOrFail($validated['plan_id']);
            $provider = $validated['provider'] ?? null;
            $options = $validated['options'] ?? [];

            $result = $this->orchestrator->createCheckoutSession($user, $plan, $provider, $options);

            return response()->json([
                'success' => true,
                'data' => $result,
            ]);

        } catch (ValidationException $e) {
            return response()->json([
                'success' => false,
                'errors' => $e->errors(),
            ], 422);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * Create a new subscription
     */
    public function createSubscription(Request $request): JsonResponse
    {
        try {
            $validated = $request->validate([
                'plan_id' => 'required|exists:plans,id',
                'provider' => 'nullable|string|in:stripe,lemon_squeezy,polar',
                'options' => 'nullable|array',
            ]);

            $user = $request->user();
            $plan = Plan::findOrFail($validated['plan_id']);
            $provider = $validated['provider'] ?? null;
            $options = $validated['options'] ?? [];

            // Only recurring providers can create subscriptions
            if (! $plan->monthly_billing) {
                return response()->json([
                    'success' => false,
                    'error' => 'This plan does not support recurring subscriptions. Use checkout instead.',
                ], 400);
            }

            $result = $this->orchestrator->createSubscription($user, $plan, $provider, $options);

            return response()->json([
                'success' => true,
                'data' => $result,
            ]);

        } catch (ValidationException $e) {
            return response()->json([
                'success' => false,
                'errors' => $e->errors(),
            ], 422);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * Get available payment methods for a plan
     */
    public function getPaymentMethods(Request $request): JsonResponse
    {
        try {
            $validated = $request->validate([
                'plan_id' => 'required|exists:plans,id',
            ]);

            $plan = Plan::findOrFail($validated['plan_id']);
            $providers = $this->orchestrator->getActiveProvidersForPlan($plan);

            $methods = $providers->map(function ($provider) use ($plan) {
                return [
                    'provider' => $provider->getName(),
                    'name' => $provider->getName(),
                    'supports_recurring' => $provider->supportsRecurring(),
                    'supports_one_time' => $provider->supportsOneTime(),
                    'supported_currencies' => $provider->getSupportedCurrencies(),
                    'fees' => $provider->calculateFees($plan->price),
                    'active' => $provider->isActive(),
                ];
            })->values()->toArray();

            return response()->json([
                'success' => true,
                'data' => [
                    'plan' => [
                        'id' => $plan->id,
                        'name' => $plan->name,
                        'price' => $plan->price,
                        'monthly_billing' => $plan->monthly_billing,
                    ],
                    'payment_methods' => $methods,
                ],
            ]);

        } catch (ValidationException $e) {
            return response()->json([
                'success' => false,
                'errors' => $e->errors(),
            ], 422);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * Get user's payment/subscription history
     */
    public function getHistory(Request $request): JsonResponse
    {
        try {
            $validated = $request->validate([
                'limit' => 'nullable|integer|min:1|max:100',
                'offset' => 'nullable|integer|min:0',
                'filters' => 'nullable|array',
            ]);

            $user = $request->user();
            $limit = $validated['limit'] ?? 20;
            $filters = $validated['filters'] ?? [];

            $history = $this->orchestrator->getTransactionHistory($user, $filters);

            // Apply pagination
            $offset = $validated['offset'] ?? 0;
            $paginatedHistory = array_slice($history, $offset, $limit);

            return response()->json([
                'success' => true,
                'data' => [
                    'transactions' => $paginatedHistory,
                    'pagination' => [
                        'total' => count($history),
                        'limit' => $limit,
                        'offset' => $offset,
                        'has_more' => $offset + $limit < count($history),
                    ],
                ],
            ]);

        } catch (ValidationException $e) {
            return response()->json([
                'success' => false,
                'errors' => $e->errors(),
            ], 422);
        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage(),
            ], 500);
        }
    }

    /**
     * Handle successful payment redirect
     */
    public function success(Request $request): JsonResponse
    {
        return response()->json([
            'status' => 'success',
            'message' => 'Payment completed successfully',
        ]);
    }

    /**
     * Handle cancelled payment redirect
     */
    public function cancel(Request $request): JsonResponse
    {
        return response()->json([
            'status' => 'cancelled',
            'message' => 'Payment was cancelled',
        ]);
    }

    /**
     * Handle payment provider webhooks
     */
    public function webhook(Request $request, string $provider): JsonResponse
    {
        try {
            $result = $this->orchestrator->processWebhook($provider, $request);

            return response()->json([
                'status' => 'processed',
                'result' => $result,
            ]);
        } catch (\Exception $e) {
            return response()->json([
                'status' => 'error',
                'message' => $e->getMessage(),
            ], 400);
        }
    }
}