// <author></author>
// <date></date>
// <description></description>

using ERP.Framework.Constants;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.OpenApi.Models;
using Swashbuckle.AspNetCore.Annotations;
using Swashbuckle.AspNetCore.SwaggerGen;

namespace ERP.Framework.Extensions
{
    public static class SwaggerExtension
    {
        public static void AddSwagger(this IServiceCollection services)
        {
            services.AddSwaggerGen(options =>
            {
                var openApiSecurityScheme = new OpenApiSecurityScheme
                {
                    Reference = new OpenApiReference
                    {
                        Type = ReferenceType.SecurityScheme,
                        Id = AuthConstant.HEADER
                    },
                    Scheme = "oauth2",
                    Name = AuthConstant.HEADER,
                    In = ParameterLocation.Header,
                    Type = SecuritySchemeType.ApiKey
                };

                var securityRequirement = new OpenApiSecurityRequirement { [openApiSecurityScheme] = new List<string>() };

                // 设置 Swagger UI 的标题和版本 (描述,联系人,许可证)
                options.SwaggerDoc("v1", new OpenApiInfo { Title = "ERP", Version = "v1" });
                // 安全方案
                options.AddSecurityDefinition(AuthConstant.HEADER, openApiSecurityScheme);
                // 请求头
                options.AddSecurityRequirement(securityRequirement);
                // 自定义逻辑
                options.OperationFilter<SwaggerDescriptionFilter>();
                options.OperationFilter<SwaggerSummaryFilter>();
            });
        }

        private class PrefixDocumentFilter : IDocumentFilter
        {
            private readonly string _prefix;

            public PrefixDocumentFilter(string prefix)
            {
                _prefix = prefix;
            }

            public void Apply(OpenApiDocument swaggerDoc, DocumentFilterContext context)
            {
                var paths = new OpenApiPaths();

                foreach (var path in swaggerDoc.Paths)
                {
                    paths.Add(_prefix + path.Key, path.Value);
                }

                swaggerDoc.Paths = paths;
            }
        }

        private class SwaggerDescriptionFilter : IOperationFilter
        {
            public void Apply(OpenApiOperation operation, OperationFilterContext context)
            {
                var attribute = context.MethodInfo
                    .GetCustomAttributes(typeof(SwaggerOperationAttribute), false)
                    .FirstOrDefault() as SwaggerOperationAttribute;

                if (attribute != null && !string.IsNullOrEmpty(attribute.Description))
                {
                    operation.Description = attribute.Description;
                }
            }
        }

        public class SwaggerSummaryFilter : IOperationFilter
        {
            public void Apply(OpenApiOperation operation, OperationFilterContext context)
            {
                var attribute = context.MethodInfo
                    .GetCustomAttributes(typeof(SwaggerOperationAttribute), false)
                    .FirstOrDefault() as SwaggerOperationAttribute;

                if (attribute != null && !string.IsNullOrEmpty(attribute.Summary))
                {
                    operation.Summary = attribute.Summary;
                }
            }
        }
    }
}