<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Str;
use Inertia\Inertia;
use Inertia\Response;

class SupportAdminController extends Controller
{
    private function assertAdmin(): void
    {
        if (!Auth::check() || strtolower((string) Auth::user()->role) !== 'admin') {
            abort(403, 'Nur für Admins');
        }
    }

    private function ollamaStatus(): array
    {
        $host = rtrim(env('OLLAMA_HOST', 'http://127.0.0.1:11434'), '/');
        $model = env('OLLAMA_MODEL', 'llama3');
        try {
            $res = Http::timeout(2)->get($host . '/api/tags');
            return ['healthy' => $res->ok(), 'host' => $host, 'model' => $model, 'error' => $res->ok() ? null : 'Keine Verbindung'];
        } catch (\Throwable $e) {
            return ['healthy' => false, 'host' => $host, 'model' => $model, 'error' => $e->getMessage()];
        }
    }

    private function getThreads(): array
    {
        $index = cache()->get('support_threads_index', []);
        $threads = [];
        foreach (array_reverse($index) as $row) {
            $full = cache()->get('support_threads:' . $row['id']);
            if (is_array($full)) {
                $threads[] = $full;
            } else {
                $threads[] = $row;
            }
        }
        return $threads;
    }

    public function index(Request $request): Response
    {
        $this->assertAdmin();

        $enabled = (bool) (cache()->get('support_chat_enabled') ?? config('app.support_chat_enabled', true));

        return Inertia::render('Admin/Support', [
            'enabled' => $enabled,
            'threads' => $this->getThreads(),
            'ollama'  => $this->ollamaStatus(),
        ]);
    }

    public function settings(Request $request)
    {
        $this->assertAdmin();
        $data = $request->validate(['enabled' => 'required|boolean']);
        cache()->put('support_chat_enabled', (bool) $data['enabled'], now()->addYear());
        return back()->with('success', 'Support-Chat Einstellungen gespeichert.');
    }

    public function reply(Request $request, string $thread)
    {
        $this->assertAdmin();
        $data = $request->validate(['text' => 'required|string|min:1|max:1000']);

        $record = cache()->get('support_threads:' . $thread);
        if (!is_array($record)) {
            return back()->withErrors(['text' => 'Thread nicht gefunden.']);
        }

        $record['messages'][] = [
            'id'     => Str::uuid()->toString(),
            'sender' => 'agent',
            'body'   => $data['text'],
            'at'     => now()->toIso8601String(),
        ];
        $record['status']     = 'agent';
        $record['updated_at'] = now()->toIso8601String();

        cache()->put('support_threads:' . $thread, $record, now()->addDay());

        // Update index entry
        $index = cache()->get('support_threads_index', []);
        foreach ($index as &$row) {
            if (($row['id'] ?? null) === $thread) {
                $row['status']     = 'agent';
                $row['updated_at'] = $record['updated_at'];
                break;
            }
        }
        cache()->put('support_threads_index', $index, now()->addDay());

        return back()->with('success', 'Nachricht gesendet.');
    }

    public function close(Request $request, string $thread)
    {
        $this->assertAdmin();

        $record = cache()->get('support_threads:' . $thread);
        if (is_array($record)) {
            $record['status']     = 'closed';
            $record['updated_at'] = now()->toIso8601String();
            cache()->put('support_threads:' . $thread, $record, now()->addDay());
        }

        $index = cache()->get('support_threads_index', []);
        foreach ($index as &$row) {
            if (($row['id'] ?? null) === $thread) {
                $row['status'] = 'closed';
                break;
            }
        }
        cache()->put('support_threads_index', $index, now()->addDay());

        return back()->with('success', 'Chat geschlossen.');
    }
}