<?php

namespace App\Modules\Chatbot\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Models\Setting;
use App\Models\User;
use App\Modules\Chatbot\Models\ChatbotConversation;
use App\Modules\Chatbot\Models\ChatbotMessage;
use App\Modules\Chatbot\Notifications\ChatbotConversationNotification;
use App\Modules\Chatbot\Services\OpenRouterService;
use App\Modules\Chatbot\Services\LlamaCppService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Notification;
use Illuminate\Support\Facades\Validator;

class ChatbotApiController extends Controller
{
    /**
     * Register visitor information before starting the chat.
     */
    public function registerVisitor(Request $request): JsonResponse
    {
        // Check if chatbot is enabled
        if (Setting::get('chatbot_enabled', 'off') !== 'on') {
            return response()->json([
                'success' => false,
                'message' => 'O assistente virtual está indisponível no momento.',
            ], 403);
        }

        $validator = Validator::make($request->all(), [
            'session_id' => 'required|string|max:255|regex:/^[a-zA-Z0-9\-_]+$/',
            'name' => 'required|string|max:255',
            'phone' => 'required|string|max:30',
            'city' => 'required|string|max:255',
        ], [
            'session_id.regex' => 'ID de sessão inválido.',
            'name.required' => 'Por favor, informe seu nome.',
            'phone.required' => 'Por favor, informe seu telefone.',
            'city.required' => 'Por favor, informe sua cidade.',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Preencha todos os campos obrigatórios.',
                'errors' => $validator->errors(),
            ], 422);
        }

        $sessionId = $request->input('session_id');

        // Get or create conversation and save visitor info
        $conversation = ChatbotConversation::getOrCreateBySession($sessionId);
        $conversation->update([
            'visitor_name' => trim($request->input('name')),
            'visitor_phone' => trim($request->input('phone')),
            'visitor_city' => trim($request->input('city')),
        ]);

        // Send notification to admins
        $adminTypes = \App\Models\UserType::where('is_admin', true)->pluck('name')->toArray();
        $admins = User::whereIn('user_type', $adminTypes)->get();

        if ($admins->isNotEmpty()) {
            Notification::send($admins, new ChatbotConversationNotification($conversation));
        }

        return response()->json([
            'success' => true,
            'message' => 'Dados registrados com sucesso.',
        ]);
    }

    /**
     * Handle an incoming chat message from the public widget.
     */
    public function sendMessage(Request $request): JsonResponse
    {
        // Check if chatbot is enabled
        if (Setting::get('chatbot_enabled', 'off') !== 'on') {
            return response()->json([
                'success' => false,
                'message' => 'O assistente virtual está indisponível no momento.',
            ], 403);
        }

        $validator = Validator::make($request->all(), [
            'message' => 'required|string|max:1000',
            'session_id' => 'required|string|max:255|regex:/^[a-zA-Z0-9\-_]+$/',
        ], [
            'session_id.regex' => 'ID de sessão inválido.',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Mensagem inválida.',
                'errors' => $validator->errors(),
            ], 422);
        }

        $sessionId = $request->input('session_id');
        $userMessage = trim($request->input('message'));

        // Get or create conversation
        $conversation = ChatbotConversation::getOrCreateBySession($sessionId);

        // Check if conversation is ended
        if ($conversation->isEnded()) {
            return response()->json([
                'success' => false,
                'message' => 'Esta conversa foi finalizada. Inicie uma nova conversa.',
                'conversation_ended' => true,
            ], 403);
        }

        // Save user message
        ChatbotMessage::create([
            'conversation_id' => $conversation->id,
            'role' => 'user',
            'content' => $userMessage,
        ]);

        // Get conversation context
        $context = $conversation->getContextForApi(20);

        // Call the configured AI provider (OpenRouter or llama.cpp)
        $provider = Setting::get('chatbot_provider', 'openrouter');

        if ($provider === 'llamacpp') {
            $aiService = new LlamaCppService();
        } else {
            $aiService = new OpenRouterService();
        }

        $result = $aiService->chat($context, $conversation);

        // Save assistant message with token usage
        ChatbotMessage::create([
            'conversation_id' => $conversation->id,
            'role' => 'assistant',
            'content' => $result['content'],
            'tokens_used' => $result['tokens_used'],
        ]);

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

    /**
     * End a conversation.
     */
    public function endConversation(Request $request): JsonResponse
    {
        $validator = Validator::make($request->all(), [
            'session_id' => 'required|string|max:255|regex:/^[a-zA-Z0-9\-_]+$/',
        ], [
            'session_id.regex' => 'ID de sessão inválido.',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Sessão inválida.',
            ], 422);
        }

        $sessionId = $request->input('session_id');
        $conversation = ChatbotConversation::where('session_id', $sessionId)->first();

        if (!$conversation) {
            return response()->json([
                'success' => false,
                'message' => 'Conversa não encontrada.',
            ], 404);
        }

        if ($conversation->isEnded()) {
            return response()->json([
                'success' => true,
                'message' => 'Conversa já foi finalizada.',
            ]);
        }

        $conversation->update([
            'status' => 'ended',
            'ended_at' => now(),
        ]);

        return response()->json([
            'success' => true,
            'message' => 'Conversa finalizada com sucesso.',
        ]);
    }

    /**
     * Submit a rating for a conversation.
     */
    public function rateConversation(Request $request): JsonResponse
    {
        $validator = Validator::make($request->all(), [
            'session_id' => 'required|string|max:255|regex:/^[a-zA-Z0-9\-_]+$/',
            'rating' => 'required|integer|min:1|max:5',
            'comment' => 'nullable|string|max:500',
        ], [
            'session_id.regex' => 'ID de sessão inválido.',
            'rating.required' => 'Por favor, selecione uma avaliação.',
            'rating.min' => 'A avaliação mínima é 1 estrela.',
            'rating.max' => 'A avaliação máxima é 5 estrelas.',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Avaliação inválida.',
                'errors' => $validator->errors(),
            ], 422);
        }

        $sessionId = $request->input('session_id');
        $conversation = ChatbotConversation::where('session_id', $sessionId)->first();

        if (!$conversation) {
            return response()->json([
                'success' => false,
                'message' => 'Conversa não encontrada.',
            ], 404);
        }

        $conversation->update([
            'rating' => $request->input('rating'),
            'rating_comment' => $request->input('comment'),
        ]);

        return response()->json([
            'success' => true,
            'message' => 'Avaliação registrada. Obrigado pelo feedback!',
        ]);
    }

    /**
     * Get the initial welcome message and chatbot status.
     */
    public function getStatus(): JsonResponse
    {
        $enabled = Setting::get('chatbot_enabled', 'off') === 'on';
        $welcomeMessage = Setting::get('chatbot_welcome_message', 'Olá! Como posso ajudar você hoje?');

        return response()->json([
            'enabled' => $enabled,
            'welcome_message' => $welcomeMessage,
        ]);
    }
}