<?php

declare(strict_types=1);

namespace App\Core\Agent;

use App\Core\Services\AI\ChatServiceInterface;
use App\Core\Services\Calendar\CalendarService;
use DateTimeImmutable;

use function sprintf;
use function strtr;

class Agent
{
    public function __construct(
        private readonly PromptProvider $promptProvider,
        private readonly CalendarService $calendarService,
        private readonly ChatServiceInterface $chatGPTService,
    ) {
    }

    public function run(): array
    {
        $prompt = $this->getPrompt();
        $response = $this->chatGPTService->sendMessage($prompt);

        return [
            'prompt' => $prompt,
            'response' => $response,
        ];
    }

    public function getPrompt(): string
    {
        $now = new DateTimeImmutable();
        $from = $now->modify('-1 day');
        $to = $now->modify('+7 days');

        $calendars = $this->calendarService->getCalendars();
        $calendarEventsText = '';

        foreach ($calendars as $calendar) {
            $calendarEventsText .= sprintf(
                "- %s: %s\n",
                $calendar->getName(),
                $calendar->getDescription(),
            );
        }

        return strtr($this->promptProvider->getPromptTemplate(), [
            '{calendar_events}' => $calendarEventsText,
            '{current_time}' => $now->format('Y-m-d H:i:s'),
        ]);
    }
}