using Microsoft.AspNetCore.Mvc.ApiExplorer;
using Microsoft.Extensions.Options;
using Microsoft.OpenApi.Models;
using Swashbuckle.AspNetCore.SwaggerGen;
using System.Reflection;

namespace BMA.EHR.Recruit.Service
{
	public class ConfigureSwaggerOptions : IConfigureNamedOptions<SwaggerGenOptions>
	{
		private readonly IApiVersionDescriptionProvider _provider;

		public ConfigureSwaggerOptions(
			IApiVersionDescriptionProvider provider)
		{
			_provider = provider;
		}

		public void Configure(SwaggerGenOptions options)
		{
			// add swagger document for every API version discovered
			foreach (var description in _provider.ApiVersionDescriptions)
			{
				options.EnableAnnotations();

				options.SwaggerDoc(
					description.GroupName,
					CreateVersionInfo(description));
			}

			options.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme
			{
				In = ParameterLocation.Header,
				Description = "Please enter a valid token",
				Name = "Authorization",
				Type = SecuritySchemeType.Http,
				BearerFormat = "JWT",
				Scheme = "Bearer"
			});

			options.AddSecurityRequirement(new OpenApiSecurityRequirement
			{
				{
					new OpenApiSecurityScheme
					{
						Reference = new OpenApiReference
						{
							Type = ReferenceType.SecurityScheme,
							Id = "Bearer"
						}
					},
					new string[]{}
				}
			});

			// generate the XML docs that'll drive the swagger docs
			var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
			var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
			options.IncludeXmlComments(xmlPath);
		}

		public void Configure(string name, SwaggerGenOptions options)
		{
			Configure(options);
		}

		private OpenApiInfo CreateVersionInfo(
				ApiVersionDescription desc)
		{
			var info = new OpenApiInfo()
			{
				Title = "BMA EHR Recruit Service Document",
				Version = desc.ApiVersion.ToString()
			};

			if (desc.IsDeprecated)
			{
				info.Description += " This API version has been deprecated. Please use one of the new APIs available from the explorer.";
			}

			return info;
		}
	}
}