<?php
declare(strict_types=1);

require_once __DIR__ . '/ProviderInterface.php';

/**
 * Für lokale Smoke-Tests ohne echten API-Key (siehe README.md) — liefert eine feste,
 * valide AiPlanningResponse-JSON zurück statt einen echten LLM-Aufruf zu machen. Niemals als
 * Standard-Provider in config.php eintragen, nur über eine explizite lokale Umgebungsvariable
 * (siehe plan.php) für Entwicklungszwecke aktivieren.
 */
class FakeProvider implements ProviderInterface
{
    public function sendMessage(string $systemPrompt, string $userContent, int $maxTokens): array
    {
        if (str_contains($systemPrompt, 'Placeholder-Namen')) {
            $input = json_decode($userContent, true);
            $classifications = array_map(static fn(array $candidate): array => [
                'id' => $candidate['id'],
                'blockIds' => $candidate['blockIds'] ?? [$candidate['id']],
                'name' => $candidate['suggestedName'] ?? 'Feld',
                'type' => $candidate['type'] ?? 'text',
                'confidence' => $candidate['confidence'] ?? 'low',
            ], $input['candidates'] ?? []);
            return [
                'content' => json_encode(['classifications' => $classifications]),
                'inputTokens' => 42, 'outputTokens' => 17,
                'cacheCreationInputTokens' => 0, 'cacheReadInputTokens' => 0,
            ];
        }
        return [
            'content' => json_encode([
                'lessons' => [
                    [
                        'id' => null,
                        'date' => null,
                        'lessonNumber' => null,
                        'topic' => 'Fake-Vorschlag zum Testen',
                        'startTime' => null,
                        'phases' => [],
                        'homework' => null,
                        'reflection' => null,
                    ],
                ],
                'summary' => 'Antwort des FakeProvider (kein echter KI-Aufruf).',
            ]),
            'inputTokens' => 42,
            'outputTokens' => 17,
            'cacheCreationInputTokens' => 0,
            'cacheReadInputTokens' => 0,
        ];
    }
}