using System.Linq;
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using Volo.Abp.SettingManagement.Localization;
using Volo.Abp.UI.Navigation;

namespace Volo.Abp.SettingManagement.Blazor.Menus
{
    public class SettingManagementMenuContributor : IMenuContributor
    {
        public async Task ConfigureMenuAsync(MenuConfigurationContext context)
        {
            if (context.Menu.Name == StandardMenus.Main)
            {
                await ConfigureMainMenuAsync(context);
            }
        }

        private async Task ConfigureMainMenuAsync(MenuConfigurationContext context)
        {
            var settingManagementPageOptions = context.ServiceProvider.GetRequiredService<IOptions<SettingManagementComponentOptions>>().Value;
            var settingPageCreationContext = new SettingComponentCreationContext(context.ServiceProvider);
            if (!settingManagementPageOptions.Contributors.Any() ||
                !(await CheckAnyOfPagePermissionsGranted(settingManagementPageOptions, settingPageCreationContext))
            )
            {
                return;
            }

            var l = context.GetLocalizer<AbpSettingManagementResource>();

            /* This may happen if MVC UI is being used in the same application.
             * In this case, we are removing the MVC setting management UI. */
            context.Menu.GetAdministration().TryRemoveMenuItem(SettingManagementMenus.GroupName);
            
            context.Menu
                .GetAdministration()
                .AddItem(
                    new ApplicationMenuItem(
                        SettingManagementMenus.GroupName,
                        l["Settings"],
                        "~/setting-management",
                        icon: "fa fa-cog"
                    )
                );
        }

        protected virtual async Task<bool> CheckAnyOfPagePermissionsGranted(
            SettingManagementComponentOptions settingManagementComponentOptions,
            SettingComponentCreationContext settingComponentCreationContext)
        {
            foreach (var contributor in settingManagementComponentOptions.Contributors)
            {
                if (await contributor.CheckPermissionsAsync(settingComponentCreationContext))
                {
                    return true;
                }
            }
            return false;
        }
    }
}