using System;
using System.Collections.Generic;
using System.Linq;
using LitJson;
using SimpleHttpServer;
using System.Reflection;
using Sog;

namespace Operation
{
    public static class Resolver
    {
        private static Dictionary<int, Permission> Permissions = new Dictionary<int, Permission>();

        private static Dictionary<string, Menu> menus = new Dictionary<string, Menu>();

        //无需登陆可直接请求的接口：注册、登陆、外部api等
        public static List<KeyValuePair<string,string>> Ignored = new List<KeyValuePair<string,string>>();

        public static List<string> logRequestList = new List<string>();

        public static List<string> AllRequestList = new List<string>();


        private static void CheckPermissionCode()
        {
            int[] permissionCodes = (int[])Enum.GetValues(typeof(PermissionCode));
            bool hasDuplicates = permissionCodes.GroupBy(x => x).Any(g => g.Count() > 1);
            if (hasDuplicates)
            {
                throw new InvalidOperationException("permission code duplicates,please check");
            }
        }

        public static void Register(string httpApiCmd,
            Func<string, JsonData, HttpResponse, HttpRequest, HttpQueryParams, uint, int> httpApiFunction)
        {
            if (httpApiFunction == null)
            {
                Ignored.Add(new KeyValuePair<string, string>(key:httpApiCmd,value:""));
                return;
            }

            if (AllRequestList.Contains(httpApiCmd))
            {
                throw new InvalidOperationException();
            }

            AllRequestList.Add(httpApiCmd);
            var method = httpApiFunction.Method;
            var declaringType = method.DeclaringType;
            string parent = "";
            if (declaringType != null)
            {
                var menuMapping = declaringType.GetCustomAttribute<MenuMapping>();
                if (menuMapping != null)
                {
                    if (menuMapping.refc == null)
                    {
                        var name = menuMapping.Name;
                        var order = menuMapping.Order;
                        var icon = menuMapping.Icon;
                        var permission = menuMapping.Pcode;
                        parent = name;
                        AddParentMenu(name, "", icon, order, permission);
                        AddPermission(name, "", permission);
                    }
                    else
                    {
                        var refcMenuMapping = menuMapping.refc.GetCustomAttribute<MenuMapping>();
                        if (refcMenuMapping == null)
                        {
                            throw new InvalidOperationException();
                        }

                        var name = refcMenuMapping.Name;
                        var order = refcMenuMapping.Order;
                        var icon = refcMenuMapping.Icon;
                        var permission = refcMenuMapping.Pcode;
                        parent = name;
                        AddParentMenu(name, "", icon, order, permission);
                        AddPermission(name, "", permission);
                    }
                }
            }

            var attr = method.GetCustomAttribute<RequestMapping>();
            if (attr != null)
            {
                var toMenu = attr.isMenu;
                var name = attr.Name;
                var pCode = (int)attr.Permission;
                if (toMenu)
                {
                    AddSubMenu(parent, name, httpApiCmd, "", 1, pCode);
                }

                AddPermission(name, httpApiCmd, pCode);
                if (attr.toLog)
                {
                    logRequestList.Add(httpApiCmd);
                }

                if (attr.Ignored)
                {
                    Ignored.Add(new KeyValuePair<string, string>(key:httpApiCmd,value:name));
                }
            }
            else
            {
                Ignored.Add(new KeyValuePair<string, string>(key:httpApiCmd,value:""));
                TraceLog.Debug("Resolver.Register http request permission not found, url={0}", httpApiCmd);
            }
        }

        public static void AddParentMenu(string name, string url, string icon, int order, int permission)
        {
            if (menus.ContainsKey(name))
            {
                return;
            }

            Menu menu = new Menu();
            menu.Url = url;
            menu.Name = name;
            menu.Order = order;
            menu.ParentId = 0;
            menu.Icon = icon;
            menu.Permission = permission;
            menus[name] = menu;
        }

        public static void AddSubMenu(string parent, string name, string url, string icon, int order, int permission)
        {
            if (!menus.ContainsKey(parent))
            {
                throw new InvalidOperationException("Resolver.AddSubMenu not found parent menu parentId=" + parent);
            }

            var pMenu = menus[parent];
            Menu menu = new Menu();
            menu.Url = url;
            menu.Name = name;
            menu.Order = order;
            menu.ParentId = 0;
            menu.Icon = icon;
            menu.Permission = permission;
            pMenu.subMenus.Add(menu);
        }

        public static void AddPermission(string name, string url, int code)
        {
            if (Permissions.ContainsKey(code))
            {
                if (url != "")
                {
                    Permissions[code].Urls.Add(url);
                }
            }
            else
            {
                int pocde = 0;
                Type enumType = typeof(PermissionCode);
                Array enumValues = Enum.GetValues(enumType);
                foreach (var p in enumValues)
                {
                    FieldInfo fieldInfo = enumType.GetField(p.ToString());
                    PermissionMapping customAttribute = (PermissionMapping)Attribute.GetCustomAttribute(fieldInfo,
                        typeof(PermissionMapping));
                    if ((int)p == code && customAttribute != null)
                    {
                        pocde = customAttribute.PCode;
                        break;
                    }
                }

                Permission permission = new Permission();
                permission.Name = name;
                permission.Id = code;
                permission.ParentId = pocde;
                if (url != "")
                {
                    permission.Urls.Add(url);
                }

                Permissions[code] = permission;
            }
        }


        public static bool IsIgnored(string httpCmd)
        {
            return Ignored.Any(pair => pair.Key.Equals(httpCmd));
        }

        public static bool IsWritLog(string httpCmd)
        {
            return logRequestList.Contains(httpCmd);
        }

        public static string GetUrlName(string url)
        {
            foreach (var pair in Permissions)
            {
                var urls = pair.Value.Urls;
                foreach (var u in urls)
                {
                    if (u.Equals(url))
                    {
                        return pair.Value.Name;
                    }
                }
            }

            return "";
        }

        //刷新菜单权限数据
        public static void Flusher()
        {
            CheckPermissionCode();
            AdminSvc.InitMenus(menus);

            AdminSvc.InitPermissions(Permissions);
            // Permissions.Clear();
            // menus.Clear();
        }
    }
}