using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Newtonsoft.Json;
using GreenTree.Nachtragsmanagement.Core.Authentication;
using GreenTree.Nachtragsmanagement.Services.User;
using GreenTree.Nachtragsmanagement.Web.Models.Admin.User;
using GreenTree.Nachtragsmanagement.Core.Domain.User;
using GreenTree.Nachtragsmanagement.Core;
using GreenTree.Nachtragsmanagement.Core.Plugins;
using GreenTree.Nachtragsmanagement.Web.Framework.Authorization;

namespace GreenTree.Nachtragsmanagement.Web.Controllers
{
    public class AdminController : Controller
    {
        private readonly IUserService _userService;
        private readonly IUserHelper _userHelper;
        private readonly IPluginFinder _pluginFinder;

        public AdminController(
            IUserService userService,
            IUserHelper userHelper,
            IPluginFinder pluginFinder)
        {
            _userService = userService;
            _userHelper = userHelper;
            _pluginFinder = pluginFinder;

            ViewData["AllRoles"] = _userService.GetAllRoles();
            ViewData["AllFunctions"] = _userService.GetAllFunctions();
        }

        #region Users

        /// <summary>
        /// Basic user view function
        /// </summary>
        [FunctionAuthorize(true, "Administration-Users")]
        public ActionResult ViewUsers()
        {
            var users = _userService.GetAllUsers();
            var userModels = users
                .Select(u => UserDataModel.FromUser(u, false))
                .ToList();

            return View("~/Views/Admin/Users/View.cshtml", userModels);
        }

        /// <summary>
        /// Get JSON data of specific user
        /// </summary>
        /// <param name="id">User id.</param>
        public ActionResult GetUser(int id = -1)
        {
            var user = _userService.GetUserById(id);
            if (user == null)
                return new JsonResult
                {
                    Data = "notFound",
                    JsonRequestBehavior = JsonRequestBehavior.AllowGet
                };

            var userModel = UserDataModel.FromUser(user, false);

            return new JsonResult
            {
                Data = JsonConvert.SerializeObject(userModel),
                JsonRequestBehavior = JsonRequestBehavior.AllowGet
            };
        }

        /// <summary>
        /// Callback result for user grid
        /// </summary>
        public ActionResult PartialUsers()
        {
            var users = _userService.GetAllUsers();
            var userModels = users
                .Select(u => UserDataModel.FromUser(u, false))
                .ToList();

            return PartialView("~/Views/Admin/Users/_UserGridPartial.cshtml", userModels);
        }

        /// <summary>
        /// Partial edit for editing of existing or for new user
        /// </summary>
        /// <param name="id">Id for existing user, otherweise -1.</param>
        public ActionResult EditUser(int id = -1)
        {
            var user = _userService.GetUserById(id);
            var userModel = UserDataModel.FromUser(user, true);

            return PartialView("~/Views/Admin/Users/_UserEditPartial.cshtml", userModel);
        }

        /// <summary>
        /// Partial edit result if ModelState is valid, otherwise simple JSON result for success
        /// </summary>
        /// <param name="userModel">User model to be saved.</param>
        [HttpPost, ValidateInput(false)]
        public ActionResult EditUser(UserDataModel userModel)
        {
            if (!ModelState.IsValid)
            {
                foreach (var role in userModel.RoleValues)
                    userModel.RoleDescriptions.Add(
                        ((IList<Role>)ViewData["AllRoles"])
                            .First(r => r.Id == role).Description);

                return PartialView("~/Views/Admin/Users/_UserEditPartial.cshtml", userModel);
            }

            var selectedRoles = _userService.GetRolesByIds(userModel.RoleValues.ToArray());

            if (userModel.Id == -1)
            {
                var user = userModel.ToUser();

                user.SetRoles(selectedRoles);
                user.Password = StaticHelper.GetMD5Hash(userModel.Password);

                _userService.InsertUser(user);
            }
            else
            {
                var user = _userService.GetUserById(userModel.Id);

                user.CustomNumber = userModel.CustomNumber;
                user.Forename = userModel.Forename;
                user.Lastname = userModel.Lastname;
                user.MailAddress = userModel.MailAddress;

                if (!String.IsNullOrEmpty(userModel.Password))
                    user.Password = StaticHelper.GetMD5Hash(userModel.Password);

                user.SetRoles(selectedRoles);

                _userService.UpdateUser(user);
            }

            return new JsonResult
            {
                Data = "success"
            };
        }

        /// <summary>
        /// Simple JSON result for deleting a specific user
        /// </summary>
        /// <param name="id">User id.</param>
        [HttpPost]
        public ActionResult DeleteUser(int id)
        {
            var user = _userService.GetUserById(id);

            if (user != null)
                _userService.DeleteUser(user);

            return new JsonResult
            {
                Data = "success"
            };
        }

        #endregion

        #region Roles

        /// <summary>
        /// Basic role view function
        /// </summary>
        [FunctionAuthorize(true, "Administration-Roles")]
        public ActionResult ViewRoles()
        {
            var roles = _userService.GetAllRoles();
            var roleModels = roles
                .Select(r => RoleDataModel.FromRole(r, false))
                .ToList();

            return View("~/Views/Admin/Roles/View.cshtml", roleModels);
        }

        /// <summary>
        /// Get JSON data of specific role
        /// </summary>
        /// <param name="id">Role id.</param>
        public ActionResult GetRole(int id = -1)
        {
            var role = _userService.GetRoleById(id);
            if (role == null)
                return new JsonResult
                {
                    Data = "notFound",
                    JsonRequestBehavior = JsonRequestBehavior.AllowGet
                };

            var roleModel = RoleDataModel.FromRole(role, false);

            return new JsonResult
            {
                Data = JsonConvert.SerializeObject(roleModel),
                JsonRequestBehavior = JsonRequestBehavior.AllowGet
            };
        }

        /// <summary>
        /// Callback result for role grid
        /// </summary>
        public ActionResult PartialRoles()
        {
            var roles = _userService.GetAllRoles();
            var roleModels = roles
                .Select(r => RoleDataModel.FromRole(r, false))
                .ToList();

            return PartialView("~/Views/Admin/Roles/_RoleGridPartial.cshtml", roleModels);
        }

        /// <summary>
        /// Partial edit for editing of existing or for new role
        /// </summary>
        /// <param name="id">Id for existing role, otherweise -1.</param>
        public ActionResult EditRole(int id = -1)
        {
            var role = _userService.GetRoleById(id);
            var roleModel = RoleDataModel.FromRole(role, true);

            return PartialView("~/Views/Admin/Roles/_RoleEditPartial.cshtml", roleModel);
        }

        /// <summary>
        /// Partial edit result if ModelState is valid, otherwise simple JSON result for success
        /// </summary>
        /// <param name="roleModel">Role model to be saved.</param>
        [HttpPost, ValidateInput(false)]
        public ActionResult EditRole(RoleDataModel roleModel)
        {
            if (!ModelState.IsValid)
            {
                foreach (var role in roleModel.FunctionValues)
                    roleModel.FunctionDescriptions.Add(
                        ((IList<Function>)ViewData["AllFunctions"])
                            .First(r => r.Id == role).Description);

                return PartialView("~/Views/Admin/Roles/_RoleEditPartial.cshtml", roleModel);
            }

            var selectedFunctions = _userService.GetFunctionsByIds(roleModel.FunctionValues.ToArray());

            if (roleModel.Id == -1)
            {
                var role = roleModel.ToRole();

                role.SetFunctions(selectedFunctions);

                _userService.InsertRole(role);
            }
            else
            {
                var role = _userService.GetRoleById(roleModel.Id);

                role.Description = roleModel.Description;
                role.Level = roleModel.Level;

                role.SetFunctions(selectedFunctions);

                _userService.UpdateRole(role);
            }

            return new JsonResult
            {
                Data = "success"
            };
        }

        /// <summary>
        /// Simple JSON result for deleting a specific role
        /// </summary>
        /// <param name="id">Role id.</param>
        /// <param name="replaceId">Id of role which user get in place of deleting role.</param>
        [HttpPost]
        public ActionResult DeleteRole(int id, int replaceId)
        {
            var role = _userService.GetRoleById(id);
            var replaceRole = _userService.GetRoleById(replaceId);

            var roleUsers = _userService.GetUsersByRole(id);

            foreach (var user in roleUsers)
            {
                if (replaceId == -1)
                    user.Roles.Remove(role);
                else
                    user.Roles.Add(replaceRole);

                _userService.UpdateUser(user);
            }

            if (role != null)
                _userService.DeleteRole(role);

            return new JsonResult
            {
                Data = "success"
            };
        }

        #endregion

        #region Plugins

        ///// <summary>
        ///// Basic plugin view function
        ///// </summary>
        //public ActionResult ViewPlugins()
        //{
        //    var model = new PluginModel
        //    {
        //        PluginNames = new List<string[]>()
        //    };

        //    var uninstalledPlugins = _pluginFinder.GetPlugins<IPlugin>(LoadPluginsMode.NotInstalledOnly);
        //    var installedPlugins = _pluginFinder.GetPlugins<IPlugin>(LoadPluginsMode.InstalledOnly);

        //    if (installedPlugins.Any())
        //        model.PluginNames.AddRange(new List<string[]>()
        //        {
        //            new [] { installedPlugins.First().PluginDescriptor.SystemName, "installed" }
        //        });

        //    if (uninstalledPlugins.Any())
        //        model.PluginNames.AddRange(new List<string[]>()
        //        {
        //            new [] { uninstalledPlugins.First().PluginDescriptor.SystemName, "uninstalled" }
        //        });

        //    return View("~/Views/Admin/Plugins/View.cshtml");
        //}

        //[HttpPost]
        //public ActionResult InstallPlugin(string pluginName)
        //{
        //    var pluginDescriptor = _pluginFinder.GetPluginDescriptorBySystemName(pluginName, LoadPluginsMode.All);
        //    if (pluginDescriptor == null)
        //        return RedirectToAction("Plugins");

        //    if (pluginDescriptor.Installed)
        //        return RedirectToAction("Plugins");

        //    var routes = System.Web.Routing.RouteTable.Routes;

        //    pluginDescriptor.Instance().Install();

        //    _webHelper.RestartAppDomain();

        //    return RedirectToAction("Plugins");
        //}

        //[HttpPost]
        //public ActionResult UninstallPlugin(string pluginName)
        //{
        //    var pluginDescriptor = _pluginFinder.GetPluginDescriptorBySystemName(pluginName, LoadPluginsMode.All);
        //    if (pluginDescriptor == null)
        //        return RedirectToAction("Plugins");

        //    if (!pluginDescriptor.Installed)
        //        return RedirectToAction("Plugins");

        //    pluginDescriptor.Instance().Uninstall();

        //    _webHelper.RestartAppDomain();

        //    return RedirectToAction("Plugins");
        //}

        #endregion
    }
}