import { OpenAPIV3 } from "openapi-types"
// Application Sectional || Define Imports
// =================================================================================================
// =================================================================================================
import { OpenApiRouter } from "../types"
import { getOpenApiPathsObject } from "./paths"
import { errorResponseObject } from "./schema"

export const openApiVersion = "3.0.3"

// Application Sectional || Define Export Type
// =================================================================================================
// =================================================================================================
export type OpenApiTag = {
  name: string;
  description?: string;
  externalDocs?: {
    description?: string;
    url: string;
  };
};

export type GenerateOpenApiDocumentOptions = {
  title: string;
  description?: string;
  version: string;
  baseUrl: string;
  docsUrl?: string;
  termsURL?: string;
  tags?: (string | OpenApiTag)[];
  securitySchemes?: OpenAPIV3.ComponentsObject["securitySchemes"];
  contact?: {
    email: string;
  };
  license?: {
    name: string;
    url: string;
  };
  externalDocs?: {
    description: string;
    url: string;
  };
};

// Application Sectional || Define Export Handler
// =================================================================================================
// =================================================================================================
export const generateOpenApiDocument = (
  appRouter: OpenApiRouter,
  opts: GenerateOpenApiDocumentOptions
): OpenAPIV3.Document => {
  const securitySchemes = opts.securitySchemes || {
    Authorization: {
      type: "http",
      scheme: "bearer"
    }
  }

  return {
    openapi: openApiVersion,
    info: {
      title: opts.title,
      description: opts.description,
      version: opts.version,
      termsOfService: opts.termsURL,
      contact: opts.contact ? { email: opts.contact.email } : undefined,
      license: opts.license
        ? {
          name: opts.license.name,
          url: opts.license.url
        }
        : undefined
    },
    servers: [
      {
        url: opts.baseUrl
      }
    ],
    paths: getOpenApiPathsObject(appRouter, Object.keys(securitySchemes)),
    components: {
      securitySchemes,
      responses: {
        error: errorResponseObject
      }
    },
    tags: opts.tags?.map((tag) => (typeof tag === "string"
      ? { name: tag } // Legacy support for string[]
      : {
        name: tag.name,
        description: tag.description,
        externalDocs: tag.externalDocs
          ? {
            description: tag.externalDocs.description,
            url: tag.externalDocs.url
          }
          : undefined
      })),
    // eslint-disable-next-line no-nested-ternary
    externalDocs: opts.externalDocs
      ? {
        description: opts.externalDocs.description,
        url: opts.externalDocs.url
      }
      : opts.docsUrl
        ? { url: opts.docsUrl }
        : undefined
  }
}