<?php

namespace App\Http\Controllers;

use App\Services\AuditLogService;
use App\Services\ProjectSearchChatService;
use App\Services\ProjectSearchService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;
use RuntimeException;
use Throwable;

class ProjectSearchController extends Controller
{
    public function __construct(
        private readonly ProjectSearchService $projectSearch,
        private readonly ProjectSearchChatService $chat,
        private readonly AuditLogService $audit
    ) {
    }

    public function index(Request $request): View
    {
        $username = (string) $request->session()->get('ldap_username', '');
        $indexRuns = $this->projectSearch->isAvailable()
            ? $this->projectSearch->indexStatus()
            : [];

        $activeSession = $username !== '' && $this->chat->isAvailable()
            ? $this->chat->activeSession($username)
            : null;

        $messages = $activeSession !== null
            ? $this->chat->messagesForSessionId((int) $activeSession['id'])
            : [];

        $chatHistory = $username !== '' && $this->chat->isAvailable()
            ? $this->chat->recentEndedSessions($username, 8)
            : [];

        return view('project-search.index', [
            'sources' => $this->projectSearch->listSources(),
            'indexRuns' => array_slice($indexRuns, 0, 5),
            'indexAvailable' => $this->projectSearch->isAvailable(),
            'chatAvailable' => $this->chat->isAvailable(),
            'ollamaConfigured' => (string) config('ollama.base_url') !== '',
            'oauthClientId' => (string) config('project_search.oauth_client_id'),
            'oauthScope' => (string) config('project_search.oauth_scope'),
            'oauthTokenUrl' => rtrim((string) config('app.url'), '/').'/oauth/token',
            'activeSession' => $activeSession,
            'messages' => $messages,
            'chatHistory' => $chatHistory,
        ]);
    }

    public function ask(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'query' => ['required', 'string', 'min:3', 'max:500'],
            'sources' => ['sometimes', 'array'],
            'sources.*' => ['string', 'max:64'],
            'limit' => ['sometimes', 'integer', 'min:1', 'max:50'],
        ]);

        $username = (string) $request->session()->get('ldap_username', '');
        if ($username === '') {
            return response()->json(['message' => 'Sesi login tidak valid.'], 401);
        }

        try {
            $sources = $validated['sources'] ?? [];
            $session = $this->chat->getOrCreateActiveSession($username, $sources);
            $sessionId = (int) $session['id'];

            $history = $this->chat->conversationHistoryForOllama($sessionId);
            $userMessage = $this->chat->addUserMessage($sessionId, $validated['query']);

            $result = $this->projectSearch->ask(
                $validated['query'],
                $sources,
                (int) ($validated['limit'] ?? config('project_search.default_limit', 20)),
                $history
            );

            $assistantMessage = $this->chat->addAssistantMessage(
                $sessionId,
                $result['answer'],
                $result['results'],
                $result['meta']
            );

            $this->audit->log(
                'project_search.chat.ask',
                'web',
                $username,
                null,
                'project_search',
                $request,
                200,
                [
                    'session_id' => $sessionId,
                    'query' => $validated['query'],
                    'result_count' => $result['meta']['result_count'] ?? 0,
                    'sources' => $result['meta']['sources'] ?? [],
                ]
            );

            return response()->json([
                'session' => $session,
                'user_message' => $userMessage,
                'assistant_message' => $assistantMessage,
            ]);
        } catch (RuntimeException $e) {
            return response()->json(['message' => $e->getMessage()], 422);
        } catch (Throwable) {
            return response()->json(['message' => 'Gagal memproses pencarian proyek.'], 500);
        }
    }

    public function endChat(Request $request): JsonResponse
    {
        $username = (string) $request->session()->get('ldap_username', '');
        if ($username === '') {
            return response()->json(['message' => 'Sesi login tidak valid.'], 401);
        }

        $ended = $this->chat->endActiveSession($username);

        if ($ended) {
            $this->audit->log(
                'project_search.chat.end',
                'web',
                $username,
                null,
                'project_search',
                $request,
                200,
                []
            );
        }

        return response()->json(['ended' => $ended]);
    }
}