import defaultKy from 'ky'

export const DIFFBOT_API_BASE_URL = 'https://api.diffbot.com'
export const DIFFBOT_KNOWLEDGE_GRAPH_API_BASE_URL = 'https://kg.diffbot.com'

export interface DiffbotExtractOptions {
  /** Specify optional fields to be returned from any fully-extracted pages, e.g.: &fields=querystring,links. See available fields within each API's individual documentation pages.
   * @see https://docs.diffbot.com/reference/extract-optional-fields
   */
  fields?: string[]

  /** (*Undocumented*) Pass paging=false to disable automatic concatenation of multiple-page articles. (By default, Diffbot will concatenate up to 20 pages of a single article.) */
  paging?: boolean

  /** Pass discussion=false to disable automatic extraction of comments or reviews from pages identified as articles or products. This will not affect pages identified as discussions. */
  discussion?: boolean

  /** Sets a value in milliseconds to wait for the retrieval/fetch of content from the requested URL. The default timeout for the third-party response is 30 seconds (30000). */
  timeout?: number

  /** Used to specify the IP address of a custom proxy that will be used to fetch the target page, instead of Diffbot's default IPs/proxies. (Ex: &proxy=168.212.226.204) */
  proxy?: string

  /** Used to specify the authentication parameters that will be used with the proxy specified in the &proxy parameter. (Ex: &proxyAuth=username:password) */
  proxyAuth?: string

  /** `none` will instruct Extract to not use proxies, even if proxies have been enabled for this particular URL globally. */
  useProxy?: string

  /** @see https://docs.diffbot.com/reference/extract-custom-javascript */
  customJs?: string

  /** @see https://docs.diffbot.com/reference/extract-custom-headers */
  customHeaders?: Record<string, string>
}

export interface DiffbotExtractAnalyzeOptions extends DiffbotExtractOptions {
  /** Web page URL of the analyze to process */
  url: string

  /** By default the Analyze API will fully extract all pages that match an existing Automatic API -- articles, products or image pages. Set mode to a specific page-type (e.g., mode=article) to extract content only from that specific page-type. All other pages will simply return the default Analyze fields. */
  mode?: string

  /** Force any non-extracted pages (those with a type of "other") through a specific API. For example, to route all "other" pages through the Article API, pass &fallback=article. Pages that utilize this functionality will return a fallbackType field at the top-level of the response and a originalType field within each extracted object, both of which will indicate the fallback API used. */
  fallback?: string
}

export interface DiffbotExtractArticleOptions extends DiffbotExtractOptions {
  /** Web page URL of the analyze to process */
  url: string

  /** Set the maximum number of automatically-generated tags to return. By default a maximum of ten tags will be returned. */
  maxTags?: number

  /** Set the minimum relevance score of tags to return, between 0.0 and 1.0. By default only tags with a score equal to or above 0.5 will be returned. */
  tagConfidence?: number

  /** Used to request the output of the Diffbot Natural Language API in the field naturalLanguage. Example: &naturalLanguage=entities,facts,categories,sentiment. */
  naturalLanguage?: string[]
}

export interface DiffbotExtractResponse {
  request: DiffbotRequest
  objects: DiffbotObject[]
}

export type DiffbotExtractArticleResponse = DiffbotExtractResponse

export interface DiffbotExtractAnalyzeResponse extends DiffbotExtractResponse {
  type: string
  title: string
  humanLanguage: string
}

export interface DiffbotObject {
  date: string
  sentiment: number
  images: DiffbotImage[]
  author: string
  estimatedDate: string
  publisherRegion: string
  icon: string
  diffbotUri: string
  siteName: string
  type: string
  title: string
  tags: DiffbotTag[]
  publisherCountry: string
  humanLanguage: string
  authorUrl: string
  pageUrl: string
  html: string
  text: string
  categories?: DiffbotCategory[]
  authors: DiffbotAuthor[]
  breadcrumb?: DiffbotBreadcrumb[]
  meta?: any
}

interface DiffbotAuthor {
  name: string
  link: string
}

interface DiffbotCategory {
  score: number
  name: string
  id: string
}

export interface DiffbotBreadcrumb {
  link: string
  name: string
}

interface DiffbotImage {
  url: string
  diffbotUri: string

  naturalWidth: number
  naturalHeight: number
  width: number
  height: number

  isCached?: boolean
  primary?: boolean
}

interface DiffbotTag {
  score: number
  sentiment: number
  count: number
  label: string
  uri: string
  rdfTypes: string[]
}

interface DiffbotRequest {
  pageUrl: string
  api: string
  version: number
}

export interface Image {
  naturalHeight: number
  diffbotUri: string
  url: string
  naturalWidth: number
  primary: boolean
}

export interface Tag {
  score: number
  sentiment: number
  count: number
  label: string
  uri: string
  rdfTypes: string[]
}

export interface Request {
  pageUrl: string
  api: string
  version: number
}

export interface DiffbotSearchKnowledgeGraphOptions {
  type?: 'query' | 'text' | 'queryTextFallback' | 'crawl'
  query: string
  col?: string
  from?: number
  size?: number

  // NOTE: we only support `json`, so these options are not needed
  // We can always convert from json to another format if needed.
  // format?: 'json' | 'jsonl' | 'csv' | 'xls' | 'xlsx'
  // exportspec?: string
  // exportseparator?: string
  // exportfile?: string

  filter?: string
  jsonmode?: 'extended' | 'id'
  nonCanonicalFacts?: boolean
  noDedupArticles?: boolean
  cluster?: 'all' | 'best' | 'dedupe'
  report?: boolean
}

export interface DiffbotSearchKnowledgeGraphResponse {
  version: number
  hits: number
  results: number
  kgversion: string
  diffbot_type: string
  facet: boolean
  data: DiffbotKnowledgeGraphNode[]
}

export interface DiffbotKnowledgeGraphNode {
  score: number
  entity: DiffbotKnowledgeGraphEntity
  entity_ctx: any
  errors: string[]
  callbackQuery: string
  upperBound: number
  lowerBound: number
  count: number
  value: string
  uri: string
}

export interface DiffbotKnowledgeGraphEntity {
  id: string
  images: DiffbotImage[]
  diffbotUri: string
  name: string
  origins: string[]
}

export class DiffbotClient {
  api: typeof defaultKy
  apiKnowledgeGraph: typeof defaultKy

  apiKey: string
  apiBaseUrl: string
  apiKnowledgeGraphBaseUrl: string

  constructor({
    apiKey = process.env.DIFFBOT_API_KEY,
    apiBaseUrl = DIFFBOT_API_BASE_URL,
    apiKnowledgeGraphBaseUrl = DIFFBOT_KNOWLEDGE_GRAPH_API_BASE_URL,
    timeoutMs = 60_000,
    ky = defaultKy
  }: {
    apiKey?: string
    apiBaseUrl?: string
    apiKnowledgeGraphBaseUrl?: string
    timeoutMs?: number
    ky?: typeof defaultKy
  } = {}) {
    if (!apiKey) {
      throw new Error(`Error DiffbotClient missing required "apiKey"`)
    }

    this.apiKey = apiKey
    this.apiBaseUrl = apiBaseUrl
    this.apiKnowledgeGraphBaseUrl = apiKnowledgeGraphBaseUrl

    this.api = ky.extend({ prefixUrl: apiBaseUrl, timeout: timeoutMs })
    this.apiKnowledgeGraph = ky.extend({
      prefixUrl: apiKnowledgeGraphBaseUrl,
      timeout: timeoutMs
    })
  }

  protected async _extract<
    T extends DiffbotExtractResponse = DiffbotExtractResponse
  >(endpoint: string, options: DiffbotExtractOptions): Promise<T> {
    const { customJs, customHeaders, ...rest } = options
    const searchParams: Record<string, any> = {
      ...rest,
      token: this.apiKey
    }
    const headers = {
      ...Object.fromEntries(
        [['X-Forward-X-Evaluate', customJs]].filter(([, value]) => value)
      ),
      ...customHeaders
    }

    for (const [key, value] of Object.entries(rest)) {
      if (Array.isArray(value)) {
        searchParams[key] = value.join(',')
      }
    }

    return this.api
      .get(endpoint, {
        searchParams,
        headers
      })
      .json<T>()
  }

  async extractAnalyze(options: DiffbotExtractAnalyzeOptions) {
    return this._extract<DiffbotExtractAnalyzeResponse>('v3/analyze', options)
  }

  async extractArticle(options: DiffbotExtractArticleOptions) {
    return this._extract<DiffbotExtractArticleResponse>('v3/article', options)
  }

  async searchKnowledgeGraph(options: DiffbotSearchKnowledgeGraphOptions) {
    return this.apiKnowledgeGraph
      .get('kg/v3/dql', {
        searchParams: {
          ...options,
          token: this.apiKey
        }
      })
      .json<DiffbotSearchKnowledgeGraphResponse>()
  }
}