using System.Collections.Generic;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing;

namespace AyaNova.Api.ControllerHelpers
{
    /// <summary>
    /// case 4712: the only API routes a customer contact (UserType Customer or HeadOffice) may call:
    /// the ones the customer screens of the client use. Everything else answers 403 to a contact, so a
    /// new route stays closed to contacts unless it is added here on purpose.
    /// Ownership of the records these routes return is checked in the routes themselves.
    /// See devdocs/modernization/SECURITY-REVIEW.md, "Customer contact route allowlist".
    /// </summary>
    internal static class CustomerContactRoutes
    {
        private const string API_PREFIX = "api/v{version:apiVersion}/";

        //"METHOD route template" with the API prefix removed, exactly as in the controllers' attributes
        private static readonly HashSet<string> Allowed = new HashSet<string>
        {
            //own account
            "POST auth/change-password",
            "GET auth/totp",
            "POST auth/totp-validate",
            "POST auth/totp-disable/{id}",
            "GET user-option/{id}",
            "PUT user-option/{id}",
            //app shell
            "GET global-biz-setting/client",
            "GET enum-list/list/{enumkey}",
            "GET form-custom/{formkey}",
            "GET translation/list",
            "POST translation/subset",
            "GET server-info",
            "GET notify/new-count",
            "GET notify/app-notifications",
            "DELETE notify/{id}",
            //data lists (the server sets the customer filter for contacts)
            "POST data-list",
            "GET data-list/listfields",
            "GET data-list-column-view/{listKey}",
            "POST data-list-column-view",
            "DELETE data-list-column-view/{listKey}",
            "POST data-list-column-view/sort",
            "GET data-list-filter/list",
            "GET data-list-filter/{id}",
            "POST data-list-filter",
            "PUT data-list-filter",
            "DELETE data-list-filter/{id}",
            "GET tag-list/list",
            "POST pick-list/list",
            "POST pick-list/single",
            //work order (customer view, customer report, attachments)
            "GET workorder/customer/{id}",
            "GET attachment/list",
            "POST report/render-job",
            "GET job-operations/status/{gid}",
            "GET job-operations/logs/{gid}",
            "POST report/request-cancel/{gid}",
            //customer service requests (not accept / reject, which are staff actions)
            "POST csr",
            "PUT csr",
            "GET csr/{id}",
            "DELETE csr/{id}",
            "POST unit/customerunit",
            //notification subscriptions
            "GET notify-subscription/list",
            "GET notify-subscription/{id}",
            "POST notify-subscription",
            "PUT notify-subscription",
            "DELETE notify-subscription/{id}",
            "GET work-order-status/list",
            "GET quote-status/list",
        };

        /// <summary>
        /// True if a customer contact may call the endpoint this request was routed to.
        /// Anonymous routes (login, downloads by key, logo...) are public anyway and always allowed.
        /// </summary>
        internal static bool IsAllowed(HttpContext context)
        {
            var endpoint = context.GetEndpoint();
            if (endpoint == null)
                return true;//not routed to anything: the request ends in a 404 regardless
            if (endpoint.Metadata.GetMetadata<IAllowAnonymous>() != null)
                return true;
            if (endpoint is not RouteEndpoint routeEndpoint)
                return false;
            var template = routeEndpoint.RoutePattern.RawText ?? string.Empty;
            if (template.StartsWith(API_PREFIX))
                template = template.Substring(API_PREFIX.Length);
            return Allowed.Contains($"{context.Request.Method.ToUpperInvariant()} {template}");
        }
    }
}