<?php
class GlpiApi {
    private string $url;
    private string $appToken;
    private string $username;
    private string $password;
    private ?string $sessionToken = null;

    public function __construct(string $url, string $appToken, string $username, string $password) {
        $this->url = rtrim($url, '/');
        $this->appToken = $appToken;
        $this->username = $username;
        $this->password = $password;
    }

    private function log(string $message) {
        error_log('[GLPI API] ' . $message);
    }

    public function getSessionToken(): ?string {
        return $this->sessionToken;
    }

    public function initSession(): bool {
        $endpoint = $this->url . '/initSession';
        $ch = curl_init($endpoint);
        $auth = base64_encode($this->username . ':' . $this->password);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Authorization: Basic ' . $auth,
            'Content-Type: application/json',
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            $data = json_decode($response, true);
            $this->sessionToken = $data['session_token'] ?? null;
            return true;
        }
        return false;
    }

    public function getItems(string $itemType, array $params = []): array {
        if (!$this->sessionToken && !$this->initSession()) return [];
        $endpoint = $this->url . '/' . $itemType;
        if (!empty($params)) {
            $endpoint .= '?' . http_build_query($params);
        }
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            return json_decode($response, true) ?? [];
        }
        $this->log("getItems($itemType) HTTP $httpCode");
        return [];
    }

    public function getItem(string $itemType, int $id): ?array {
        if (!$this->sessionToken && !$this->initSession()) return null;
        $endpoint = $this->url . '/' . $itemType . '/' . $id;
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            return json_decode($response, true);
        }
        $this->log("getItem($itemType/$id) HTTP $httpCode");
        return null;
    }

    public function createTicket(array $ticketData): ?array {
        if (!$this->sessionToken && !$this->initSession()) return null;
        $endpoint = $this->url . '/Ticket';
        $ch = curl_init($endpoint);
        $payload = json_encode(['input' => $ticketData]);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
            'Content-Type: application/json',
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 201) {
            return json_decode($response, true);
        }
        $this->log("createTicket HTTP $httpCode: " . substr($response, 0, 500));
        return null;
    }

    public function getTicket(int $id): ?array {
        if (!$this->sessionToken && !$this->initSession()) return null;
        $endpoint = $this->url . '/Ticket/' . $id . '?expand_dropdowns=true';
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            return json_decode($response, true);
        }
        $this->log("getTicket($id) HTTP $httpCode");
        return null;
    }

    public function getTicketFollowups(int $ticketId): array {
        if (!$this->sessionToken && !$this->initSession()) return [];
        $endpoint = $this->url . '/Ticket/' . $ticketId . '/ITILFollowup?expand_dropdowns=true&range=0-100';
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            return json_decode($response, true) ?? [];
        }
        $this->log("getTicketFollowups($ticketId) HTTP $httpCode");
        return [];
    }

    public function getKnowbaseItems(int $start = 0, int $limit = 100): array {
        if (!$this->sessionToken && !$this->initSession()) return [];
        $params = ['range' => $start . '-' . ($start + $limit - 1), 'expand_dropdowns' => 'true'];
        $endpoint = $this->url . '/KnowbaseItem?' . http_build_query($params);
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            return json_decode($response, true) ?? [];
        }
        return [];
    }

    public function getKnowbaseItem(int $id): ?array {
        if (!$this->sessionToken && !$this->initSession()) return null;
        $endpoint = $this->url . '/KnowbaseItem/' . $id . '?expand_dropdowns=true';
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            return json_decode($response, true);
        }
        return null;
    }

    public function searchKnowbaseItems(string $query, int $limit = 30): array {
        if (!$this->sessionToken && !$this->initSession()) return [];
        $endpoint = $this->url . '/search/KnowbaseItem';
        $criteria = [
            'criteria' => [
                ['link' => 'OR', 'field' => 1, 'searchtype' => 'contains', 'value' => $query],
                ['link' => 'OR', 'field' => 2, 'searchtype' => 'contains', 'value' => $query]
            ],
            'range' => "0-$limit",
            'sort' => 2,
            'order' => 'DESC'
        ];
        $payload = json_encode($criteria);
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
            'Content-Type: application/json',
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            $data = json_decode($response, true);
            return $data['data'] ?? [];
        }
        $this->log("searchKnowbaseItems HTTP $httpCode");
        return [];
    }

    public function searchKnowbaseItemsSince(string $since, int $limit = 1000): array {
        if (!$this->sessionToken && !$this->initSession()) return [];
        $endpoint = $this->url . '/search/KnowbaseItem';
        $criteria = [
            'criteria' => [
                ['field' => 15, 'searchtype' => 'morethan', 'value' => $since] // 15 = date_mod
            ],
            'range' => "0-$limit",
            'sort' => 15,
            'order' => 'ASC'
        ];
        $payload = json_encode($criteria);
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
            'Content-Type: application/json',
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            $data = json_decode($response, true);
            return $data['data'] ?? [];
        }
        $this->log("searchKnowbaseItemsSince HTTP $httpCode");
        return [];
    }

    /**
     * Получение документов, привязанных к статье базы знаний (улучшенная версия)
     */
    public function getKnowbaseItemDocuments(int $kbItemId): array {
        if (!$this->sessionToken && !$this->initSession()) return [];

        $documents = [];

        // Способ 1: через прямой фильтр Document
        $params = [
            'filter[itemtype]' => 'KnowbaseItem',
            'filter[items_id]' => $kbItemId,
            'range' => '0-100'
        ];
        $endpoint = $this->url . '/Document?' . http_build_query($params);
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            $docs = json_decode($response, true);
            if (is_array($docs) && count($docs) > 0) {
                $this->log("Got " . count($docs) . " documents for KB $kbItemId via Document filter");
                return $docs;
            }
        }

        // Способ 2: через подресурс KnowbaseItem/{id}/Document
        $endpoint = $this->url . '/KnowbaseItem/' . $kbItemId . '/Document?expand_dropdowns=true&range=0-100';
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            $docs = json_decode($response, true);
            if (is_array($docs) && count($docs) > 0) {
                $this->log("Got " . count($docs) . " documents for KB $kbItemId via subresource");
                return $docs;
            }
        }

        // Способ 3: через Document_Item (если GLPI версии 10+)
        $endpoint = $this->url . '/Document_Item?filter[itemtype]=KnowbaseItem&filter[items_id]=' . $kbItemId;
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        if ($httpCode === 200) {
            $links = json_decode($response, true);
            if (is_array($links) && count($links) > 0) {
                // Извлекаем ID документов
                $docIds = array_column($links, 'documents_id');
                if (!empty($docIds)) {
                    $ids = implode(',', $docIds);
                    $endpoint2 = $this->url . '/Document?filter[id]=' . $ids . '&range=0-100';
                    $ch2 = curl_init($endpoint2);
                    curl_setopt($ch2, CURLOPT_RETURNTRANSFER, true);
                    curl_setopt($ch2, CURLOPT_HTTPHEADER, [
                        'App-Token: ' . $this->appToken,
                        'Session-Token: ' . $this->sessionToken,
                    ]);
                    $resp2 = curl_exec($ch2);
                    if (curl_getinfo($ch2, CURLINFO_HTTP_CODE) === 200) {
                        $docs = json_decode($resp2, true);
                        $this->log("Got " . count($docs) . " documents for KB $kbItemId via Document_Item");
                        return $docs;
                    }
                }
            }
        }

        $this->log("No documents found for KB $kbItemId (tried all methods)");
        return [];
    }

    public function getDocumentContent(int $documentId): ?string {
        if (!$this->sessionToken && !$this->initSession()) return null;

        $endpoint = $this->url . '/Document/' . $documentId . '?download=true';
        $ch = curl_init($endpoint);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            'App-Token: ' . $this->appToken,
            'Session-Token: ' . $this->sessionToken,
        ]);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

        if ($httpCode !== 200 || $response === false) {
            $this->log("getDocumentContent($documentId) failed HTTP $httpCode");
            return null;
        }

        $json = json_decode($response, true);
        if (json_last_error() !== JSON_ERROR_NONE) {
            return $response;
        }

        if (isset($json['content'])) {
            $data = base64_decode($json['content'], true);
            if ($data !== false) {
                return $data;
            }
            return $json['content'];
        }

        $this->log("getDocumentContent($documentId) returned unexpected JSON");
        return null;
    }

    /**
 * Получить имя компьютера по ID
 */
public function getComputerName(int $computerId): string {
    $computer = $this->getItem('Computer', $computerId);
    if ($computer) {
        $name = $computer['name'] ?? '';
        $serial = $computer['serial'] ?? $computer['otherserial'] ?? '';
        if ($serial) {
            return "$name (Инв.№ $serial)";
        }
        return $name;
    }
    return "Компьютер #$computerId";
}

/**
 * Получить полное имя категории ITIL по ID
 */
public function getCategoryName(int $categoryId): string {
    $category = $this->getItem('ITILCategory', $categoryId);
    if ($category) {
        return $category['completename'] ?? $category['name'] ?? "Категория #$categoryId";
    }
    return "Категория #$categoryId";
}
}