using System;
using System.Linq;
using System.Web.Mvc;
using Orchard.Environment.Configuration;
using Orchard.Localization;
using Orchard.Logging;
using Orchard.MultiTenancy.Services;
using Orchard.MultiTenancy.ViewModels;
using Orchard.Security;
using Orchard.UI.Notify;
using Orchard.Utility.Extensions;

namespace Orchard.MultiTenancy.Controllers {
    [ValidateInput(false)]
    public class AdminController : Controller {
        private readonly ITenantService _tenantService;
        private readonly ShellSettings _thisShellSettings;

        public AdminController(ITenantService tenantService, IOrchardServices orchardServices, ShellSettings shellSettings) {
            _tenantService = tenantService;
            _thisShellSettings = shellSettings;
            
            Services = orchardServices;
            T = NullLocalizer.Instance;
            Logger = NullLogger.Instance;
        }

        public Localizer T { get; set; }
        public IOrchardServices Services { get; set; }
        public ILogger Logger { get; set; }

        public ActionResult Index() {
            return View(new TenantsIndexViewModel { TenantSettings = _tenantService.GetTenants() });
        }

        public ActionResult Add() {
            if (!Services.Authorizer.Authorize(StandardPermissions.SiteOwner, T("Cannot create tenant")))
                return new HttpUnauthorizedResult();

            if ( !EnsureDefaultTenant() )
                return new HttpUnauthorizedResult();

            return View(new TenantAddViewModel());
        }

        [HttpPost, ActionName("Add")]
        public ActionResult AddPOST(TenantAddViewModel viewModel) {
            try {
                if (!Services.Authorizer.Authorize(StandardPermissions.SiteOwner, T("Couldn't create tenant")))
                    return new HttpUnauthorizedResult();

                if ( !EnsureDefaultTenant() )
                    return new HttpUnauthorizedResult();

                _tenantService.CreateTenant(
                    new ShellSettings {
                        Name = viewModel.Name,
                        RequestUrlHost = viewModel.RequestUrlHost,
                        RequestUrlPrefix = viewModel.RequestUrlPrefix,
                        DataProvider = viewModel.DataProvider,
                        DataConnectionString = viewModel.DatabaseConnectionString,
                        DataTablePrefix = viewModel.DatabaseTablePrefix,
                        State = new TenantState("Uninitialized")
                    });

                return RedirectToAction("Index");
            } catch (Exception exception) {
                this.Error(exception, T("Creating Tenant failed: {0}", exception.Message), Logger, Services.Notifier);

                return View(viewModel);
            }
        }

        public ActionResult Edit(string name) {
            if (!Services.Authorizer.Authorize(StandardPermissions.SiteOwner, T("Cannot edit tenant")))
                return new HttpUnauthorizedResult();

            if ( !EnsureDefaultTenant() )
                return new HttpUnauthorizedResult();

            var tenant = _tenantService.GetTenants().FirstOrDefault(ss => ss.Name == name);
            if (tenant == null)
                return HttpNotFound();

            return View(new TenantEditViewModel {
                                                    Name = tenant.Name,
                                                    RequestUrlHost = tenant.RequestUrlHost,
                                                    RequestUrlPrefix = tenant.RequestUrlPrefix,
                                                    DataProvider = tenant.DataProvider,
                                                    DatabaseConnectionString = tenant.DataConnectionString,
                                                    DatabaseTablePrefix = tenant.DataTablePrefix,
                                                    State = tenant.State
                                                });
        }

        [HttpPost, ActionName("Edit")]
        public ActionResult EditPost(TenantEditViewModel viewModel) {
            try {
                if (!Services.Authorizer.Authorize(StandardPermissions.SiteOwner, T("Couldn't edit tenant")))
                    return new HttpUnauthorizedResult();

                if ( !EnsureDefaultTenant() )
                    return new HttpUnauthorizedResult();

                var tenant = _tenantService.GetTenants().FirstOrDefault(ss => ss.Name == viewModel.Name);
                if (tenant == null)
                    return HttpNotFound();
                
                _tenantService.UpdateTenant(
                    new ShellSettings {
                        Name = tenant.Name,
                        RequestUrlHost = viewModel.RequestUrlHost,
                        RequestUrlPrefix = viewModel.RequestUrlPrefix,
                        DataProvider = viewModel.DataProvider,
                        DataConnectionString = viewModel.DatabaseConnectionString,
                        DataTablePrefix = viewModel.DatabaseTablePrefix,
                        State = tenant.State
                    });

                return RedirectToAction("Index");
            } catch (Exception exception) {
                this.Error(exception, T("Failed to edit tenant: {0} ", exception.Message), Logger, Services.Notifier);

                return View(viewModel);
            }
        }

        [HttpPost]
        public ActionResult Disable(string name) {
            if (!Services.Authorizer.Authorize(StandardPermissions.SiteOwner, T("Couldn't disable tenant")))
                return new HttpUnauthorizedResult();

            if ( !EnsureDefaultTenant() )
                return new HttpUnauthorizedResult();

            var tenant = _tenantService.GetTenants().FirstOrDefault(ss => ss.Name == name);

            if (tenant != null && tenant.Name != _thisShellSettings.Name) {
                tenant.State.CurrentState = TenantState.State.Disabled;
                _tenantService.UpdateTenant(tenant);
            }

            return RedirectToAction("Index");
        }

        [HttpPost]
        public ActionResult Enable(string name) {
            if (!Services.Authorizer.Authorize(StandardPermissions.SiteOwner, T("Couldn't enable tenant")))
                return new HttpUnauthorizedResult();

            if ( !EnsureDefaultTenant() )
                return new HttpUnauthorizedResult();

            var tenant = _tenantService.GetTenants().FirstOrDefault(ss => ss.Name == name);

            if (tenant != null && tenant.Name != _thisShellSettings.Name) {
                tenant.State.CurrentState = TenantState.State.Running;
                _tenantService.UpdateTenant(tenant);
            }

            return RedirectToAction("Index");
        }

        private bool EnsureDefaultTenant() {
            return _thisShellSettings.Name == ShellSettings.DefaultName;
        }
    }
}