<?php

class ChatModel
{
    public function insert($sender, $receiver, $message)
    {
        $db = Database::getInstance()->getConnection();

        $stmt = $db->prepare("
            INSERT INTO chat (user_sender, user_empfaenger, nachricht, gelesen)
            VALUES (?, ?, ?, 0)
        ");

        $stmt->bind_param("iis", $sender, $receiver, $message);
        $stmt->execute();
    }

    public function getMessagesBetweenUsers($user1, $user2)
    {
        $db = Database::getInstance()->getConnection();

        $stmt = $db->prepare("
            SELECT * FROM chat
            WHERE (user_sender = ? AND user_empfaenger = ?)
               OR (user_sender = ? AND user_empfaenger = ?)
            ORDER BY id ASC
        ");

        $stmt->bind_param("iiii", $user1, $user2, $user2, $user1);
        $stmt->execute();
        return $stmt->get_result()->fetch_all(MYSQLI_ASSOC);
    }

    public function markAsRead($sender, $receiver)
    {
        $db = Database::getInstance()->getConnection();

        $stmt = $db->prepare("
            UPDATE chat SET gelesen = 1
            WHERE user_sender = ? AND user_empfaenger = ?
        ");

        $stmt->bind_param("ii", $sender, $receiver);
        $stmt->execute();
    }

    public function getUnreadCounts($receiverId)
    {
        $db = Database::getInstance()->getConnection();

        $stmt = $db->prepare("
            SELECT user_sender, COUNT(*) AS unread
            FROM chat
            WHERE user_empfaenger = ? AND gelesen = 0
            GROUP BY user_sender
        ");

        $stmt->bind_param("i", $receiverId);
        $stmt->execute();

        $rows = $stmt->get_result()->fetch_all(MYSQLI_ASSOC);

        $out = [];
        foreach ($rows as $r) {
            $out[$r['user_sender']] = $r['unread'];
        }

        return $out;
    }
}