<?php

namespace App\Services\Pacs;

use App\Models\DicomServer;
use App\Services\StudyRouter\RawDicomTags;
use GuzzleHttp\Client;
use Psr\Http\Message\ResponseInterface;

final class OrthancRestClient
{
    public function __construct(private readonly DicomServer $orthancHost) {}

    private static function relativePath(string $study_id, ?string $child = null, array $query = [], string $parent = 'studies'): string
    {
        $parts = [$parent, ltrim($study_id, '/')];
        if (filled($child)) {
            $parts[] = ltrim($child, '/');
        }

        $path = implode('/', $parts);
        if (! empty($query)) {
            $path .= '?' . http_build_query($query);
        }

        return $path;
    }

    private static function jsonify(ResponseInterface $response, bool $associative = true): mixed
    {
        return json_decode($response->getBody()->getContents(), $associative, 512, JSON_THROW_ON_ERROR);
    }

    public function getClient(): Client
    {
        $endpoint = $this->orthancHost->rest_api_endpoint;

        return new Client([
            'base_uri' => $endpoint,
            // 'base_uri' => config('pacs.api.endpoint'),
        ]);
    }

    public function getStudyStatistics(string $study_id): array
    {
        $response = $this->getClient()->get('/studies/' . $study_id . '/statistics');

        return self::jsonify($response);
    }

    public function getServerStatistics(): array
    {
        $response = $this->getClient()->get('/statistics');

        return self::jsonify($response);
    }

    public function getStudySeries(string $study_id): array
    {
        $response = $this->getClient()->get(self::relativePath($study_id, 'series', ['expand' => 1]));

        return self::jsonify($response);
    }

    public function getStudyInstances(string $study_id): array
    {
        $response = $this->getClient()->get(self::relativePath($study_id, 'instances', ['expand' => 1]));

        return self::jsonify($response);
    }

    public function getStudyInstancesList(string $study_id): array
    {
        $response = $this->getClient()->get(self::relativePath($study_id, 'instances', ['expand' => 0]));

        return self::jsonify($response);
    }

    public function getStudyDetails(string $study_id): array
    {
        $query = [
            'requested-tags' => implode(';', array_column(DicomTags::cases(), 'value')),
        ];
        $response = $this->getClient()->get(self::relativePath($study_id, null, $query));

        return self::jsonify($response);
    }

    public function getInstanceDetails(string $instance_id, bool $rawTags = false): array
    {
        $query = $rawTags ? [
            'requested-tags' => implode(';', array_column(RawDicomTags::cases(), 'value')),
            'short' => 1,
        ] : [];
        $response = $this->getClient()->get(self::relativePath($instance_id, null, $query, 'instances'));

        return self::jsonify($response);
    }

    public function getStudies(): array
    {
        $query = [
            'expand' => '1',
            'requested-tags' => implode(';', array_column(DicomTags::cases(), 'value')),
        ];
        $url = '/studies?' . http_build_query($query);
        $response = $this->getClient()->get($url);

        return self::jsonify($response);
    }

    public function getStudiesIds(): array
    {
        return json_decode($this->getClient()->get('/studies')->getBody()->getContents(), true, 512, JSON_THROW_ON_ERROR);
    }
}