<?php
/**
 * UserPreferencesModel
 * Handles user-specific preferences and settings
 */

class UserPreferencesModel {
    private $conn;

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

    /**
     * Get all preferences for a user
     * @param int $userId User ID
     * @return array Associative array of preference_key => preference_value
     */
    public function getUserPreferences($userId) {
        $sql = "SELECT preference_key, preference_value
                FROM user_preferences
                WHERE user_id = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param("i", $userId);
        $stmt->execute();
        $result = $stmt->get_result();

        $prefs = [];
        while ($row = $result->fetch_assoc()) {
            $prefs[$row['preference_key']] = $row['preference_value'];
        }
        return $prefs;
    }

    /**
     * Set or update a preference for a user
     * @param int $userId User ID
     * @param string $key Preference key
     * @param string $value Preference value
     * @return bool Success status
     */
    public function setPreference($userId, $key, $value) {
        $sql = "INSERT INTO user_preferences (user_id, preference_key, preference_value)
                VALUES (?, ?, ?)
                ON DUPLICATE KEY UPDATE preference_value = VALUES(preference_value)";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param("iss", $userId, $key, $value);
        return $stmt->execute();
    }

    /**
     * Get a single preference value for a user
     * @param int $userId User ID
     * @param string $key Preference key
     * @param mixed $default Default value if preference doesn't exist
     * @return mixed Preference value or default
     */
    public function getPreference($userId, $key, $default = null) {
        $sql = "SELECT preference_value FROM user_preferences
                WHERE user_id = ? AND preference_key = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param("is", $userId, $key);
        $stmt->execute();
        $result = $stmt->get_result();

        if ($row = $result->fetch_assoc()) {
            return $row['preference_value'];
        }
        return $default;
    }

    /**
     * Delete a preference for a user
     * @param int $userId User ID
     * @param string $key Preference key
     * @return bool Success status
     */
    public function deletePreference($userId, $key) {
        $sql = "DELETE FROM user_preferences
                WHERE user_id = ? AND preference_key = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param("is", $userId, $key);
        return $stmt->execute();
    }

    /**
     * Delete all preferences for a user
     * @param int $userId User ID
     * @return bool Success status
     */
    public function deleteAllPreferences($userId) {
        $sql = "DELETE FROM user_preferences WHERE user_id = ?";
        $stmt = $this->conn->prepare($sql);
        $stmt->bind_param("i", $userId);
        return $stmt->execute();
    }
}
?>