/**
 * <div style={{backgroundColor: "#000", display: "flex", justifyContent: "space-between", color: "#fff", padding: 16}}>
 * <span>Built-in <b>TikTok</b> integration.</span>
 * <a href="https://www.tiktok.com/">
 *   <img style={{display: "block"}} src="https://authjs.dev/img/providers/tiktok.svg" height="48" />
 * </a>
 * </div>
 *
 * @module providers/tiktok
 */
import { TokenSet } from "../types.js"
import type { OAuthConfig, OAuthUserConfig } from "./index.js"

/**
 * [More info](https://developers.tiktok.com/doc/tiktok-api-v2-get-user-info/)
 */
export interface TiktokProfile extends Record<string, any> {
  data: {
    user: {
      /**
       * The unique identification of the user in the current application.Open id
       * for the client.
       *
       * To return this field, add `fields=open_id` in the user profile request's query parameter.
       */
      open_id: string
      /**
       * The unique identification of the user across different apps for the same developer.
       * For example, if a partner has X number of clients,
       * it will get X number of open_id for the same TikTok user,
       * but one persistent union_id for the particular user.
       *
       * To return this field, add `fields=union_id` in the user profile request's query parameter.
       */
      union_id?: string
      /**
       * User's profile image.
       *
       * To return this field, add `fields=avatar_url` in the user profile request's query parameter.
       */
      avatar_url: string
      /**
       * User`s profile image in 100x100 size.
       *
       * To return this field, add `fields=avatar_url_100` in the user profile request's query parameter.
       */
      avatar_url_100?: string
      /**
       * User's profile image with higher resolution
       *
       * To return this field, add `fields=avatar_url_100` in the user profile request's query parameter.
       */
      avatar_large_url?: string
      /**
       * User's profile name
       *
       * To return this field, add `fields=display_name` in the user profile request's query parameter.
       */
      display_name: string
      /**
       * User's username.
       *
       * To return this field, add `fields=username` in the user profile request's query parameter.
       */
      username: string
      /** @note Email is currently unsupported by TikTok  */
      email?: string
      /**
       * User's bio description if there is a valid one.
       *
       * To return this field, add `fields=bio_description` in the user profile request's query parameter.
       */
      bio_description?: string
      /**
       * The link to user's TikTok profile page.
       *
       * To return this field, add `fields=profile_deep_link` in the user profile request's query parameter.
       */
      profile_deep_link?: string
      /**
       * Whether TikTok has provided a verified badge to the account after confirming
       * that it belongs to the user it represents.
       *
       * To return this field, add `fields=is_verified` in the user profile request's query parameter.
       */
      is_verified?: boolean
      /**
       * User's followers count.
       *
       * To return this field, add `fields=follower_count` in the user profile request's query parameter.
       */
      follower_count?: number
      /**
       * The number of accounts that the user is following.
       *
       * To return this field, add `fields=following_count` in the user profile request's query parameter.
       */
      following_count?: number
      /**
       * The total number of likes received by the user across all of their videos.
       *
       * To return this field, add `fields=likes_count` in the user profile request's query parameter.
       */
      likes_count?: number
      /**
       * The total number of publicly posted videos by the user.
       *
       * To return this field, add `fields=video_count` in the user profile request's query parameter.
       */
      video_count?: number
    }
  }
  error: {
    /**
     * The error category in string.
     */
    code: string
    /**
     * The error message in string.
     */
    message: string
    /**
     * The error message in string.
     */
    log_id: string
  }
}

/**
 * Add TikTok login to your page.
 *
 * ### Setup
 *
 * #### Callback URL
 * ```
 * https://example.com/api/auth/callback/tiktok
 * ```
 *
 * #### Configuration
 *```ts
 * import { Auth } from "@auth/core"
 * import TikTok from "@auth/core/providers/tiktok"
 *
 * const request = new Request(origin)
 * const response = await Auth(request, {
 *   providers: [
 *     TikTok({ clientId: TIKTOK_CLIENT_KEY, clientSecret: TIKTOK_CLIENT_SECRET }),
 *   ],
 * })
 * ```
 *
 * ### Resources
 *  - [TikTok app console](https://developers.tiktok.com/)
 *  - [TikTok login kit documentation](https://developers.tiktok.com/doc/login-kit-web/)
 *  - [Avaliable Scopes](https://developers.tiktok.com/doc/tiktok-api-scopes/)
 *
 *
 * ### Notes
 *
 * :::tip
 *
 * Production applications cannot use localhost URLs to sign in with TikTok. You need add the domain and Callback/Redirect url's to your TikTok app and have them review and approved by the TikTok Team.
 *
 * :::
 *
 * :::tip
 *
 * Email address is not supported by TikTok.
 *
 * :::
 *
 * :::tip
 *
 * Client_ID will be the Client Key in the TikTok Application
 *
 * :::
 *
 * By default, Auth.js assumes that the TikTok provider is
 * based on the [OAuth 2](https://www.rfc-editor.org/rfc/rfc6749.html) specification.
 *
 * :::tip
 *
 * The TikTok provider comes with a [default configuration](https://github.com/nextauthjs/next-auth/blob/main/packages/core/src/providers/tiktok.ts).
 * To override the defaults for your use case, check out [customizing a built-in OAuth provider](https://authjs.dev/guides/configuring-oauth-providers).
 *
 * :::
 *
 * :::info **Disclaimer**
 *
 * If you think you found a bug in the default configuration, you can [open an issue](https://authjs.dev/new/provider-issue).
 *
 * Auth.js strictly adheres to the specification and it cannot take responsibility for any deviation from
 * the spec by the provider. You can open an issue, but if the problem is non-compliance with the spec,
 * we might not pursue a resolution. You can ask for more help in [Discussions](https://authjs.dev/new/github-discussions).
 *
 * :::
 */
export default function TikTok<P extends TiktokProfile>(
  options: OAuthUserConfig<P>
): OAuthConfig<P> {
  return {
    id: "tiktok",
    name: "TikTok",
    type: "oauth",
    authorization: {
      url: "https://www.tiktok.com/v2/auth/authorize",
      params: {
        client_key: options.clientId,
        scope: "user.info.profile",
        response_type: "code",
      },
    },

    token: {
      async request({ params, provider }) {
        const res = await fetch(`https://open.tiktokapis.com/v2/oauth/token/`, {
          method: "POST",
          headers: {
            "Cache-Control": "no-cache",
            "Content-Type": "application/x-www-form-urlencoded",
          },
          body: new URLSearchParams({
            client_key: provider.clientId!,
            client_secret: provider.clientSecret!,
            code: params.code!,
            grant_type: "authorization_code",
            redirect_uri: provider.callbackUrl!,
          }),
        }).then((res) => res.json())

        const tokens: TokenSet = {
          access_token: res.access_token,
          expires_at: res.expires_in,
          refresh_token: res.refresh_token,
          scope: res.scope,
          id_token: res.open_id,
          token_type: res.token_type,
          session_state: res.open_id,
        }
        return {
          tokens,
        }
      },
    },
    userinfo: {
      url: "https://open.tiktokapis.com/v2/user/info/?fields=open_id,avatar_url,display_name,username",
      async request({ tokens, provider }) {
        return await fetch(provider.userinfo?.url as URL, {
          headers: { Authorization: `Bearer ${tokens.access_token}` },
        }).then(async (res) => await res.json())
      },
    },
    profile(profile) {
      return {
        id: profile.data.user.open_id,
        name: profile.data.user.display_name,
        image: profile.data.user.avatar_url,
        email: profile.data.user.email || null,
      }
    },
    style: {
      bg: "#000",
      text: "#fff",
    },
    options,
  }
}