using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.IO;
using YY.Admin.Core.Util;

namespace YY.Admin.Helper
{
    /// <summary>
    /// 服务器连接配置读写工具。
    /// </summary>
    public static class ServerSettingsStore
    {
        private const string DefaultWebSocketPath = "/websocket/scada-sync";

        /// <summary>
        /// 安装目录随包发布的默认配置（只读）。
        /// </summary>
        public static string GetBundledAppSettingsPath()
        {
            return Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Configuration", "appsettings.json");
        }

        /// <summary>
        /// 用户覆盖配置（可写），仅覆盖 JeecgIntegration 节点时使用。
        /// </summary>
        public static string GetUserAppSettingsPath()
        {
            var dir = AppWritablePaths.EnsureDirectoryExists(AppWritablePaths.ConfigurationDirectory);
            return Path.Combine(dir, "appsettings.json");
        }

        /// <summary>
        /// 兼容旧调用：优先返回用于读取的实际路径（存在用户覆盖则用用户文件）。
        /// </summary>
        public static string GetConfigPath()
        {
            var user = GetUserAppSettingsPath();
            if (File.Exists(user))
            {
                return user;
            }

            return GetBundledAppSettingsPath();
        }

        public class ServerSettingsModel
        {
            public string Ip { get; set; } = "127.0.0.1";
            public int Port { get; set; } = 8080;
            public string BaseScheme { get; set; } = "http";
            public string BasePath { get; set; } = "/jeecg-boot";
            public string WebSocketUrl { get; set; } = string.Empty;
            public string WebSocketPath { get; set; } = DefaultWebSocketPath;
            /// <summary>
            /// 是否断开连接（true=断开，false=连接）
            /// </summary>
            public bool DisconnectConnection { get; set; } = false;
        }

        private static JObject LoadMergedRoot()
        {
            var bundledPath = GetBundledAppSettingsPath();
            if (!File.Exists(bundledPath))
            {
                throw new FileNotFoundException("未找到安装目录默认配置文件 appsettings.json", bundledPath);
            }

            var root = JObject.Parse(File.ReadAllText(bundledPath));
            var userPath = GetUserAppSettingsPath();
            if (!File.Exists(userPath))
            {
                return root;
            }

            var userRoot = JObject.Parse(File.ReadAllText(userPath));
            var userJeecg = userRoot["JeecgIntegration"] as JObject;
            if (userJeecg != null)
            {
                root["JeecgIntegration"] = userJeecg;
            }

            return root;
        }

        public static ServerSettingsModel Load()
        {
            var model = new ServerSettingsModel();
            var root = LoadMergedRoot();
            var jeecg = root["JeecgIntegration"] as JObject;
            if (jeecg == null)
            {
                return model;
            }

            var baseUrl = jeecg.Value<string>("BaseUrl") ?? string.Empty;
            if (Uri.TryCreate(baseUrl, UriKind.Absolute, out var uri))
            {
                model.BaseScheme = uri.Scheme;
                model.Ip = uri.Host;
                model.Port = uri.Port;
                model.BasePath = string.IsNullOrWhiteSpace(uri.AbsolutePath) ? string.Empty : uri.AbsolutePath.TrimEnd('/');
            }

            model.WebSocketUrl = jeecg.Value<string>("WebSocketUrl") ?? string.Empty;
            model.WebSocketPath = NormalizeWebSocketPath(jeecg.Value<string>("WebSocketPath"));
            model.DisconnectConnection = jeecg.Value<bool?>("DisconnectConnection") ?? false;
            return model;
        }

        public static void Save(ServerSettingsModel model)
        {
            var root = LoadMergedRoot();
            var jeecg = root["JeecgIntegration"] as JObject;
            if (jeecg == null)
            {
                jeecg = new JObject();
                root["JeecgIntegration"] = jeecg;
            }

            var basePath = string.IsNullOrWhiteSpace(model.BasePath) ? string.Empty : model.BasePath.TrimEnd('/');
            if (!string.IsNullOrWhiteSpace(basePath) && !basePath.StartsWith('/'))
            {
                basePath = "/" + basePath;
            }

            var baseUrl = $"{model.BaseScheme}://{model.Ip}:{model.Port}{basePath}";
            var webSocketPath = NormalizeWebSocketPath(model.WebSocketPath);
            var webSocketUrl = string.IsNullOrWhiteSpace(model.WebSocketUrl)
                ? BuildDefaultWebSocketUrl(model.BaseScheme, model.Ip, model.Port, basePath, webSocketPath)
                : model.WebSocketUrl.Trim();
            jeecg["BaseUrl"] = baseUrl;
            jeecg["WebSocketUrl"] = webSocketUrl;
            jeecg["WebSocketPath"] = webSocketPath;
            jeecg["DisconnectConnection"] = model.DisconnectConnection;

            var userPath = GetUserAppSettingsPath();
            var outRoot = new JObject { ["JeecgIntegration"] = jeecg };
            File.WriteAllText(userPath, outRoot.ToString(Formatting.Indented));
        }

        public static string BuildDefaultWebSocketUrl(string baseScheme, string ip, int port, string basePath, string webSocketPath = DefaultWebSocketPath)
        {
            var safeScheme = string.Equals(baseScheme, "https", StringComparison.OrdinalIgnoreCase) ? "wss" : "ws";
            var safeBasePath = string.IsNullOrWhiteSpace(basePath) ? string.Empty : basePath.TrimEnd('/');
            if (!string.IsNullOrWhiteSpace(safeBasePath) && !safeBasePath.StartsWith('/'))
            {
                safeBasePath = "/" + safeBasePath;
            }

            var safeWsPath = NormalizeWebSocketPath(webSocketPath);
            return $"{safeScheme}://{ip}:{port}{safeBasePath}{safeWsPath}";
        }

        private static string NormalizeWebSocketPath(string? webSocketPath)
        {
            var value = string.IsNullOrWhiteSpace(webSocketPath) ? DefaultWebSocketPath : webSocketPath.Trim();
            if (!value.StartsWith('/'))
            {
                value = "/" + value;
            }

            return value;
        }
    }
}