<?php

declare(strict_types=1);

require dirname(__DIR__) . '/vendor/autoload.php';

use app\common\service\DifyChatService;

function expectSame($expected, $actual, string $message): void
{
    if ($expected !== $actual) {
        fwrite(STDERR, "FAIL: {$message}\n");
        exit(1);
    }
}

function callPrivate(string $name, array $arguments)
{
    $method = (new ReflectionClass(DifyChatService::class))->getMethod($name);
    return $method->invoke(null, ...$arguments);
}

$generic = callPrivate('buildRequestSpecs', [
    'https://ai.example.test/v1',
    'model-name',
    ['prompt_version' => 'test'],
    'clinical prompt',
    'server-user',
]);
expectSame(2, count($generic), 'ambiguous /v1 base should support both protocols');
expectSame('https://ai.example.test/v1/chat-messages', $generic[0]['url'], 'Dify endpoint');
expectSame('blocking', $generic[0]['payload']['response_mode'], 'Dify blocking request');
expectSame('https://ai.example.test/v1/chat/completions', $generic[1]['url'], 'OpenAI endpoint');
expectSame('model-name', $generic[1]['payload']['model'], 'profile model selection');
expectSame('clinical prompt', $generic[1]['payload']['messages'][0]['content'], 'OpenAI prompt');
$serializedSpecs = json_encode($generic, JSON_UNESCAPED_SLASHES) ?: '';
expectSame(false, str_contains($serializedSpecs, 'api_key'), 'credential field is absent from request bodies');
expectSame(false, str_contains($serializedSpecs, 'provider'), 'provider override is absent from request bodies');
expectSame(false, str_contains($serializedSpecs, 'base_url'), 'base URL override is absent from request bodies');

$openAi = callPrivate('buildRequestSpecs', [
    'https://ai.example.test/v1/chat/completions',
    'model-name',
    [],
    'prompt',
    'server-user',
]);
expectSame(1, count($openAi), 'explicit OpenAI endpoint should not probe Dify');
expectSame('openai', $openAi[0]['protocol'], 'explicit OpenAI protocol');

$dify = callPrivate('buildRequestSpecs', [
    'https://ai.example.test/v1/chat-messages',
    'model-name',
    [],
    'prompt',
    'server-user',
]);
expectSame(1, count($dify), 'explicit Dify endpoint should not probe OpenAI');
expectSame('dify', $dify[0]['protocol'], 'explicit Dify protocol');

expectSame('Dify answer', callPrivate('extractContent', [['answer' => ' Dify answer ']]), 'Dify response');
expectSame(
    'OpenAI answer',
    callPrivate('extractContent', [['choices' => [['message' => ['content' => ' OpenAI answer ']]]]]),
    'OpenAI response'
);
expectSame(
    'multipart answer',
    callPrivate('extractContent', [['choices' => [['message' => ['content' => [
        ['type' => 'text', 'text' => 'multipart '],
        ['type' => 'text', 'text' => 'answer'],
    ]]]]]]),
    'OpenAI multipart response'
);

expectSame(true, callPrivate('isValidBaseUrl', ['https://ai.example.test/v1']), 'https URL');
expectSame(true, callPrivate('isValidBaseUrl', ['http://127.0.0.1:8080/v1']), 'internal http URL');
expectSame(false, callPrivate('isValidBaseUrl', ['file:///tmp/socket']), 'non-http URL');
expectSame(false, callPrivate('isValidBaseUrl', ['https://user@example.test/v1']), 'userinfo URL');
expectSame(false, callPrivate('isValidBaseUrl', ['https://ai.example.test/v1?unsafe=query']), 'query URL');
expectSame(true, callPrivate('isValidTimeout', [90]), 'normal timeout');
expectSame(false, callPrivate('isValidTimeout', [0]), 'zero timeout');
expectSame(false, callPrivate('isValidTimeout', [301]), 'excessive timeout');

echo "Prescription AI upstream contract: OK\n";