// Copyright IBM Corp. 2018. All Rights Reserved.
// Node module: openapi-to-graphql
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT

/**
 * Type definitions for the OpenAPI Specification 3.
 */

type ExternalDocumentationObject = {
  description?: string
  url: string
}

export type SchemaObject = {
  title?: string
  type?: 'string' | 'number' | 'integer' | 'boolean' | 'object' | 'array'
  format?: string
  nullable?: boolean
  description?: string
  properties?: {
    [key: string]: SchemaObject | ReferenceObject
  }
  required?: string[]
  default?: any
  additionalProperties?: SchemaObject | ReferenceObject | boolean
  items?: SchemaObject | ReferenceObject // MUST be a single schema object in OAS, see https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.1.md#properties
  additionalItems?: boolean | string[]
  enum?: string[]
  allOf?: (SchemaObject | ReferenceObject)[]
  anyOf?: (SchemaObject | ReferenceObject)[]
  oneOf?: (SchemaObject | ReferenceObject)[]
  not?: (SchemaObject | ReferenceObject)[]
}

export type ReferenceObject = {
  $ref: string
}

type ExampleObject = {
  summary?: string
  description?: string
  value?: any
  externalValue?: string
}

type HeaderObject = {
  name?: string
  in?: 'query' | 'header' | 'path' | 'cookie'
  description?: string
  required?: boolean
  deprecated?: boolean
  allowEmptyValue?: boolean
}

type EncodingObject = {
  contentType?: string
  headers?: {
    [key: string]: HeaderObject | ReferenceObject
  }
  style?: string
  explode?: boolean
  allowReserved?: boolean
}

export type MediaTypeObject = {
  schema?: SchemaObject | ReferenceObject
  example?: any
  examples?: {
    [key: string]: ExampleObject | ReferenceObject
  }
  encoding?: {
    [key: string]: EncodingObject
  }
}

export type ParameterObject = {
  name: string
  in: 'query' | 'header' | 'path' | 'cookie'
  description?: string
  required?: boolean
  deprecated?: boolean
  allowEmptyValue?: boolean
  style?: 'form' | 'simple'
  explode?: boolean
  allowReserved?: boolean
  schema?: SchemaObject | ReferenceObject
  example?: any
  examples?: {
    [key: string]: ExampleObject | ReferenceObject
  }
  content?: {
    [key: string]: MediaTypeObject
  }
}

export type MediaTypesObject = {
  [key: string]: MediaTypeObject
}

export type ServerObject = {
  url: string
  description?: string
  variables?: object // TODO: extend
}

export type RequestBodyObject = {
  description?: string
  content: {
    [key: string]: MediaTypeObject
  }
  required?: boolean
}

export type LinkObject = {
  operationRef?: string
  operationId?: string
  parameters?: {
    [key: string]: any
  }
  requestBody?: any
  description?: string
  server?: ServerObject
}

export type LinksObject = {
  [key: string]: LinkObject | ReferenceObject
}

export type ResponseObject = {
  description: string
  headers?: {
    [key: string]: HeaderObject | ReferenceObject
  }
  content?: MediaTypesObject
  links?: LinksObject
}

export type ResponsesObject = {
  [key: string]: ResponseObject | ReferenceObject
}

export type SecurityRequirementObject = {
  [key: string]: string[]
}

export type OperationObject = {
  tags?: string[]
  summary?: string
  description?: string
  externalDocs?: ExternalDocumentationObject
  operationId?: string
  parameters?: Array<ParameterObject | ReferenceObject>
  requestBody?: RequestBodyObject | ReferenceObject
  responses?: ResponsesObject
  callbacks?: CallbacksObject
  deprecated?: boolean
  security?: SecurityRequirementObject[]
  servers?: ServerObject[]
}

export type PathItemObject = {
  $ref?: string
  summary?: string
  description?: string
  get: OperationObject
  put: OperationObject
  post: OperationObject
  delete: OperationObject
  options: OperationObject
  head: OperationObject
  patch: OperationObject
  trace: OperationObject
  servers?: ServerObject[]
  parameters?: [ParameterObject | ReferenceObject]
}

type PathsObject = {
  [key: string]: PathItemObject
}

export type CallbackObject = {
  [key: string]: PathItemObject
}

export type CallbacksObject = {
  [key: string]: CallbackObject | ReferenceObject
}

type OAuthFlowObject = {
  authorizationUrl?: string // Optional, beacause applies only to certain flows
  tokenUrl?: string // Optional, beacause applies only to certain flows
  refreshUrl?: string // Optional, beacause applies only to certain flows
  scopes?: {
    // Optional, beacause applies only to certain flows
    [key: string]: string
  }
}

type OAuthFlowsObject = {
  implicit?: OAuthFlowObject
  password?: OAuthFlowObject
  clientCredentials?: OAuthFlowObject
  authorizationCode?: OAuthFlowObject
}

export type SecuritySchemeObject = {
  type: 'apiKey' | 'http' | 'oauth2' | 'openIdConnect'
  description?: string
  name?: string // Optional, because applies only to apiKey
  in?: string // Optional, because applies only to apiKey
  scheme?: string // Optional, because applies only to http
  bearerFormat?: string
  flows?: OAuthFlowsObject // Optional, because applies only to oauth2
  openIdConnectUrl?: string // // Optional, because applies only to openIdConnect
}

export type SecuritySchemesObject = {
  [key: string]: SecuritySchemeObject | ReferenceObject
}

type ComponentsObject = {
  schemas?: {
    [key: string]: SchemaObject | ReferenceObject
  }
  responses?: ResponsesObject
  parameters?: {
    [key: string]: ParameterObject | ReferenceObject
  }
  examples?: {
    [key: string]: ExampleObject | ReferenceObject
  }
  requestBodies?: {
    [key: string]: RequestBodyObject | ReferenceObject
  }
  headers?: {
    [key: string]: HeaderObject | ReferenceObject
  }
  securitySchemes?: SecuritySchemesObject
  links?: LinksObject
  callbacks?: {
    [key: string]: CallbackObject | ReferenceObject
  }
}

type TagObject = {
  name: string
  description?: string
  externalDocs?: ExternalDocumentationObject
}

export type Oas3 = {
  openapi: string
  info: {
    title: string
    description?: string
    termsOfService?: string
    contact?: {
      name?: string
      url?: string
      email?: string
    }
    license?: {
      name: string
      url?: string
    }
    version: string
  }
  servers?: ServerObject[]
  paths: PathsObject
  components?: ComponentsObject
  security?: SecurityRequirementObject[]
  tags?: TagObject[]
  externalDocs?: ExternalDocumentationObject
}