using System.Configuration;

namespace XP.Common.Database.Configs
{
    /// <summary>
    /// SQLite 配置加载器，从 App.config 读取数据库相关配置项 | SQLite configuration loader, reads database-related configuration from App.config
    /// </summary>
    public static class ConfigLoader
    {
        /// <summary>
        /// 配置键前缀 | Configuration key prefix
        /// </summary>
        private const string KeyPrefix = "Sqlite:";

        /// <summary>
        /// 从 App.config 加载 SQLite 配置 | Load SQLite configuration from App.config
        /// </summary>
        /// <returns>SQLite 配置实体，缺失或无效配置项使用默认值 | SQLite configuration entity, uses default values for missing or invalid items</returns>
        public static SqliteConfig LoadSqliteConfig()
        {
            var config = new SqliteConfig();

            // 加载数据库文件路径 | Load database file path
            var dbPath = ConfigurationManager.AppSettings[KeyPrefix + "DbFilePath"];
            if (!string.IsNullOrEmpty(dbPath)) config.DbFilePath = dbPath;

            // 加载连接超时时间 | Load connection timeout
            var timeout = ConfigurationManager.AppSettings[KeyPrefix + "ConnectionTimeout"];
            if (int.TryParse(timeout, out var t) && t > 0) config.ConnectionTimeout = t;

            // 加载是否自动创建 | Load create if not exists
            var createIfNotExists = ConfigurationManager.AppSettings[KeyPrefix + "CreateIfNotExists"];
            if (bool.TryParse(createIfNotExists, out var c)) config.CreateIfNotExists = c;

            // 加载是否启用 WAL 模式 | Load enable WAL mode
            var enableWal = ConfigurationManager.AppSettings[KeyPrefix + "EnableWalMode"];
            if (bool.TryParse(enableWal, out var w)) config.EnableWalMode = w;

            // 加载是否开启 SQL 日志 | Load enable SQL logging
            var enableSqlLog = ConfigurationManager.AppSettings[KeyPrefix + "EnableSqlLogging"];
            if (bool.TryParse(enableSqlLog, out var l)) config.EnableSqlLogging = l;

            return config;
        }
    }
}