using Astralis;
using Inversion;
using Spry.Authorisation;

namespace Spry.Authentication {

    public class UserManagementComponent : Component {
        public int page_number { get; set; default = 0; }
        public string authorisation_permission { get; set; default = "spry.admin"; }
        public bool authorised { get; set; }
        public const int64 users_per_page = 20;

        public override string markup { get { return """
        <spry-context property="page_number" />
        <div spry-if="!this.authorised">
            <strong>You must have the permission <code content-expr="this.authorisation_permission"></code> to access this content.</strong>
        </div>
        <div spry-else sid="container" style="gap: 1em;">
            <spry-outlet sid="outlet" />
            <div>
                <button spry-action=":previous" spry-target="container">Previous</button>
                <span>Page <strong content-expr="stringify(this.page_number + 1)"></strong></span>
                <button spry-action=":next" spry-target="container">Next</button>
            </div>
        </div>
        """; }}

        private UserService user_service = inject<UserService>();
        private AuthorisationContext authorisation_context = inject<AuthorisationContext>();
        private ComponentFactory component_factory = inject<ComponentFactory>();

        public async override void prepare () throws Error {
            if(authorisation_context.is_anonymous() || !authorisation_context.has_permission (authorisation_permission)) {
                authorised = false;
                return;
            }

            authorised = true;
            var users = yield user_service.list_users (page_number * users_per_page, page_number * users_per_page + users_per_page);
            foreach (var user in users) {
                var component = component_factory.create<UserComponent>();
                component.user_id = (int)user.id;
                component.user = user;
                add_outlet_child ("outlet", component);
            }
        }

        public async override void handle_action(string action) {
            if(action == "previous") {
                page_number --;
                if(page_number < 0) {
                    page_number = 0;
                }
            }
            if(action == "next") {
                page_number ++;
            }
        }
        
    }

}