using Microsoft.Extensions.Configuration;

namespace Config;

public static class ConfigBuilderExtensions
{
    /// <summary>
    /// 创建默认配置（约定优于配置）
    /// 自动查找 appsettings.json，启用热重载和环境变量
    /// </summary>
    /// <param name="basePath">基础路径，默认为应用程序目录</param>
    /// <param name="environmentPrefix">环境变量前缀，默认为 "APP_"</param>
    /// <returns>配置管理器</returns>
    public static ConfigManager CreateDefault(
        string? basePath = null,
        string? environmentPrefix = "APP_")
    {
        basePath ??= AppContext.BaseDirectory;

        // 查找配置文件（appsettings.json, appsettings.Development.json 等）
        var configFiles = new List<string> { "appsettings.json" };

        // 根据环境添加特定配置
        var environment = Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT")
                          ?? Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")
                          ?? "Production";

        var envConfigFile = $"appsettings.{environment}.json";
        var envConfigPath = Path.Combine(basePath, envConfigFile);
        if (File.Exists(envConfigPath)) configFiles.Add(envConfigFile);

        // 构建配置
        return ConfigBuilder.BuildFromFiles(
            configFiles.ToArray(),
            true,
            true,
            environmentPrefix,
            basePath
        );
    }

    /// <summary>
    /// 创建最小化配置（只有 appsettings.json）
    /// </summary>
    public static ConfigManager CreateMinimal(string? basePath = null)
    {
        basePath ??= AppContext.BaseDirectory;

        return ConfigBuilder.BuildFromFiles(
            new[] { "appsettings.json" },
            false,
            false,
            basePath: basePath
        );
    }
}