<?php

namespace App\Actions\Chatbot;

use App\Jobs\LogChatInteractionJob;
use App\Models\ChatLog;
use App\Models\ChatSession;
use App\Services\KnowledgeBase\RAGService;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use RuntimeException;
use Throwable;

/**
 * AskQuestionAction
 *
 * Tanggungjawab: Koordinasi satu soalan chatbot.
 * 1. Urus sesi
 * 2. Panggil RAGService
 * 3. Dispatch log job (async)
 * 4. Return result
 */
class AskQuestionAction
{
    public function __construct(
        private readonly RAGService $ragService
    ) {}

    /**
     * @param  string   $question
     * @param  ?int     $categoryId
     * @param  Request  $request
     * @return array{
     *   answer: string,
     *   has_answer: bool,
     *   sources: array[],
     *   session_token: string,
     *   chat_log_id: ?int
     * }
     * @throws RuntimeException
     */
    public function execute(
        string $question,
        ?int $categoryId,
        Request $request
    ): array {
        // ── Urus sesi ────────────────────────────────────────────────────
        $session = $this->resolveSession($request, $categoryId);

        // ── Jawab soalan melalui RAG ──────────────────────────────────────
        try {
            $result = $this->ragService->ask($question, $categoryId);
        } catch (RuntimeException $e) {
            $this->logFailedAttempt($session, $question, $categoryId, $e);

            throw $e;
        }

        // ── Log secara async (jangan tangguh response) ────────────────────
        LogChatInteractionJob::dispatch(
            $session->session_token,
            auth()->id(),
            $categoryId,
            $question,
            $result['answer'],
            $result['sources'],
            $result['context_chunks'],
            $result['model_used'],
            $result['tokens_used'],
            $result['response_time'],
            $result['has_answer'],
        );

        return [
            'answer'        => $result['answer'],
            'has_answer'    => $result['has_answer'],
            'sources'       => $result['sources'],
            'session_token' => $session->session_token,
        ];
    }

    private function resolveSession(Request $request, ?int $categoryId): ChatSession
    {
        $token = $request->session()->get('chat_session_token');

        if ($token) {
            $session = ChatSession::where('session_token', $token)->first();
            if ($session) {
                return $session;
            }
        }

        // Buat sesi baru
        $session = ChatSession::create([
            'user_id'     => auth()->id(),
            'category_id' => $categoryId,
            'ip_address'  => $request->ip(),
            'user_agent'  => $request->userAgent(),
        ]);

        $request->session()->put('chat_session_token', $session->session_token);

        return $session;
    }

    private function logFailedAttempt(
        ChatSession $session,
        string $question,
        ?int $categoryId,
        RuntimeException $exception
    ): void {
        Log::warning('Chatbot request failed before AI response', [
            'chat_session_id' => $session->id,
            'category_id' => $categoryId,
            'question' => mb_substr($question, 0, 200),
            'error' => $exception->getMessage(),
            'previous' => $exception->getPrevious()?->getMessage(),
        ]);

        try {
            ChatLog::create([
                'chat_session_id' => $session->id,
                'user_id' => auth()->id(),
                'category_id' => $categoryId,
                'question' => $question,
                'answer' => 'Perkhidmatan AI tidak tersedia pada masa ini. Sila cuba sebentar lagi.',
                'sources_used' => [],
                'context_chunks' => [],
                'model_used' => config('ollama.chat_model'),
                'tokens_used' => null,
                'response_time' => null,
                'has_answer' => false,
                'is_flagged' => true,
            ]);

            $session->update(['last_activity_at' => now()]);
        } catch (Throwable $logException) {
            Log::error('Failed to persist failed chatbot request', [
                'chat_session_id' => $session->id,
                'error' => $logException->getMessage(),
            ]);
        }
    }
}