<?php

declare(strict_types=1);

namespace OCA\AnalyticsHub\Service;

use OCA\AnalyticsHub\Model\ClientConfig;
use OCP\IDBConnection;
use OCP\AppFramework\Utility\SimplePDO;

/**
 * Database Service
 * Handles report storage in Nextcloud database
 */
class DatabaseService {

    private IDBConnection $db;

    public function __construct(IDBConnection $db) {
        $this->db = $db;
    }

    /**
     * Initialize database tables
     */
    public function initialize(): void {
        $this->createReportsTable();
    }

    /**
     * Create reports table
     */
    private function createReportsTable(): void {
        $sql = "
            CREATE TABLE IF NOT EXISTS *PREFIX*analytics_reports (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                client_id INTEGER NOT NULL,
                client_name TEXT NOT NULL,
                report_date TEXT NOT NULL,
                file_path TEXT NOT NULL,
                file_size INTEGER,
                created_at TEXT NOT NULL
            )
        ";

        $this->db->executeUpdate($sql);
    }

    /**
     * Save report to database
     */
    public function saveReport(int $clientId, string $clientName, string $markdown, string $filePath): int {
        $sql = "
            INSERT INTO *PREFIX*analytics_reports
                (client_id, client_name, report_date, file_path, file_size, created_at)
            VALUES (?, ?, ?, ?, ?, ?)
        ";

        $this->db->executeUpdate($sql, [
            $clientId,
            $clientName,
            date('Y-m-d'),
            $filePath,
            strlen($markdown),
            date('Y-m-d H:i:s')
        ]);

        return (int)$this->db->lastInsertId();
    }

    /**
     * Get report by ID
     */
    public function getReportById(int $id): ?array {
        $sql = "
            SELECT * FROM *PREFIX*analytics_reports
            WHERE id = ?
        ";

        $result = $this->db->executeQuery($sql, [$id])->fetch();

        return $result ? json_decode(json_encode($result), true) : null;
    }

    /**
     * Get all reports
     */
    public function getAllReports(): array {
        $sql = "
            SELECT * FROM *PREFIX*analytics_reports
            ORDER BY created_at DESC
            LIMIT 100
        ";

        $result = $this->db->executeQuery($sql)->fetchAll();

        return $result;
    }

    /**
     * Get reports by client
     */
    public function getReportsByClient(int $clientId): array {
        $sql = "
            SELECT * FROM *PREFIX*analytics_reports
            WHERE client_id = ?
            ORDER BY created_at DESC
        ";

        $result = $this->db->executeQuery($sql, [$clientId])->fetchAll();

        return $result;
    }

    /**
     * Get latest report
     */
    public function getLatestReport(): ?array {
        $sql = "
            SELECT * FROM *PREFIX*analytics_reports
            ORDER BY created_at DESC
            LIMIT 1
        ";

        $result = $this->db->executeQuery($sql)->fetch();

        return $result ? json_decode(json_encode($result), true) : null;
    }

    /**
     * Delete old reports (cleanup)
     */
    public function deleteOldReports(int $days = 90): int {
        $sql = "
            DELETE FROM *PREFIX*analytics_reports
            WHERE created_at < datetime('now', '-' . $days . ' days')
        ";

        return $this->db->executeUpdate($sql);
    }
}