using MAX.Framework.Interfaces;
using System.IO;

namespace Store.Management.Framework.Configs;

/// <summary>应用目录约定。路径读取不创建目录，保存配置时自动创建所需目录。</summary>
public sealed class FolderConfig : IFolderConfig
{
	/// <summary>供启动配置使用；容器也可通过 IFolderConfig 解析目录配置。</summary>
	public static FolderConfig Instance { get; } = new();

	public FolderConfig() { }

	string IFolderConfig.ConfigFolder => ConfigFolder;
	string IFolderConfig.DataFolder => DataFolder;
	string IFolderConfig.LoggingFolder => LoggingFolder;
	string IFolderConfig.CacheFolder => CacheFolder;

	public const string AppName = "StoreManagement";

	/// <summary>安装目录，用于读取随程序分发的资源。</summary>
	public static string ExeFolder => AppContext.BaseDirectory;

	/// <summary>当前用户的数据根目录：%LOCALAPPDATA%\Store.Management。</summary>
	public static string AppFolder => Path.Combine(
		Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), AppName);

	public static string ConfigFolder => Path.Combine(AppFolder, "Config");
	public static string DataFolder => Path.Combine(AppFolder, "Data");
	public static string LoggingFolder => Path.Combine(AppFolder, "Logs");
	public static string DatabaseFolder => Path.Combine(AppFolder, "Db");
	public static string CacheFolder => Path.Combine(AppFolder, "Cache");
	public static string AppSettingsFilePath => GetSettingsFilePath("AppSettings.json");

	/// <summary>获取配置文件路径，仅接受文件名，防止写出配置目录。</summary>
	public static string GetSettingsFilePath(string fileName)
	{
		ArgumentException.ThrowIfNullOrWhiteSpace(fileName);
		if (fileName is "." or ".." || fileName.IndexOfAny(Path.GetInvalidFileNameChars()) >= 0
			|| fileName.EndsWith('.') || fileName.EndsWith(' '))
			throw new ArgumentException("配置文件名不能包含路径、非法字符或以点、空格结尾。", nameof(fileName));
		return Path.Combine(ConfigFolder, fileName);
	}

	/// <summary>按需在宿主启动时创建应用目录；创建失败向调用者报告。</summary>
	public static void Initialize()
	{
		foreach (string path in new[] { ConfigFolder, DataFolder, LoggingFolder, DatabaseFolder, CacheFolder })
			Directory.CreateDirectory(path);
	}
}