<?php
/**
 * Chat Message Model
 * Handles chat message-related database operations
 */

class ChatMessageModel
{
    private $db;

    public function __construct()
    {
        $this->db = Database::getInstance();
    }

    /**
     * Create new chat message
     */
    public function create($data)
    {
        $sql = "INSERT INTO chat_messages
                (user_id, nickname, message, is_admin, ip_address, time_formatted)
                VALUES (?, ?, ?, ?, ?, ?)";

        $params = [
            $data['user_id'],
            $data['nickname'] ?? 'Anonymous',
            $data['message'],
            $data['is_admin'] ?? false,
            Security::getClientIP(),
            date('M j, H:i')
        ];

        return $this->db->insert($sql, $params);
    }

    /**
     * Get messages with pagination (newest first, limit count)
     */
    public function getRecent($limit = 100, $offset = 0)
    {
        return $this->db->fetchAll(
            "SELECT * FROM chat_messages ORDER BY timestamp DESC LIMIT ? OFFSET ?",
            [$limit, $offset]
        );
    }

    /**
     * Get messages since specific ID (for incremental updates)
     */
    public function getMessagesAfterId($lastId)
    {
        return $this->db->fetchAll(
            "SELECT * FROM chat_messages WHERE id > ? ORDER BY timestamp ASC",
            [$lastId]
        );
    }

    /**
     * Get messages since specific timestamp
     */
    public function getMessagesAfterTimestamp($timestamp)
    {
        return $this->db->fetchAll(
            "SELECT * FROM chat_messages WHERE timestamp > ? ORDER BY timestamp ASC",
            [$timestamp]
        );
    }

    /**
     * Delete message by ID (admin function)
     */
    public function deleteById($messageId)
    {
        return $this->db->delete(
            "DELETE FROM chat_messages WHERE id = ?",
            [$messageId]
        );
    }

    /**
     * Delete messages by user ID (bulk operation)
     */
    public function deleteByUserId($userId)
    {
        return $this->db->delete(
            "DELETE FROM chat_messages WHERE user_id = ?",
            [$userId]
        );
    }

    /**
     * Clear all chat messages
     */
    public function clearAll()
    {
        return $this->db->delete("DELETE FROM chat_messages");
    }

    /**
     * Get message by ID
     */
    public function getById($messageId)
    {
        return $this->db->fetch(
            "SELECT * FROM chat_messages WHERE id = ?",
            [$messageId]
        );
    }

    /**
     * Get total message count
     */
    public function getTotalCount()
    {
        return $this->db->fetchColumn("SELECT COUNT(*) FROM chat_messages");
    }

    /**
     * Get messages by user ID
     */
    public function getByUserId($userId, $limit = 50)
    {
        return $this->db->fetchAll(
            "SELECT * FROM chat_messages WHERE user_id = ? ORDER BY timestamp DESC LIMIT ?",
            [$userId, $limit]
        );
    }

    /**
     * Search messages by content
     */
    public function searchMessages($query, $limit = 50)
    {
        $searchTerm = '%' . $query . '%';
        return $this->db->fetchAll(
            "SELECT * FROM chat_messages WHERE message LIKE ? ORDER BY timestamp DESC LIMIT ?",
            [$searchTerm, $limit]
        );
    }

    /**
     * Get message statistics
     */
    public function getStats()
    {
        $stats = [];

        // Total messages
        $stats['total_messages'] = $this->db->fetchColumn("SELECT COUNT(*) FROM chat_messages");

        // Messages in last 24 hours
        $stats['messages_24h'] = $this->db->fetchColumn(
            "SELECT COUNT(*) FROM chat_messages WHERE timestamp >= datetime('now', '-1 day')"
        );

        // Messages in last hour
        $stats['messages_1h'] = $this->db->fetchColumn(
            "SELECT COUNT(*) FROM chat_messages WHERE timestamp >= datetime('now', '-1 hour')"
        );

        // Unique users who posted today
        $stats['active_users_today'] = $this->db->fetchColumn(
            "SELECT COUNT(DISTINCT user_id) FROM chat_messages WHERE DATE(timestamp) = DATE('now')"
        );

        // Most active user today
        $stats['most_active_user'] = $this->db->fetch(
            "SELECT user_id, COUNT(*) as message_count FROM chat_messages
             WHERE DATE(timestamp) = DATE('now')
             GROUP BY user_id
             ORDER BY message_count DESC LIMIT 1"
        );

        return $stats;
    }

    /**
     * Clean up old messages (older than specified days)
     */
    public function cleanupOldMessages($days = 7)
    {
        return $this->db->delete(
            "DELETE FROM chat_messages WHERE timestamp < datetime('now', '-{$days} days')"
        );
    }
}