/**
 * <div style={{backgroundColor: "#0072c6", display: "flex", justifyContent: "space-between", color: "#fff", padding: 16}}>
 * <span>Built-in <b>Azure AD B2C</b> integration.</span>
 * <a href="https://learn.microsoft.com/en-us/azure/active-directory-b2c/tutorial-create-tenant">
 *   <img style={{display: "block"}} src="https://authjs.dev/img/providers/azure.svg" height="48" width="48"/>
 * </a>
 * </div>
 *
 * @module providers/azure-ad-b2c
 */

import type { OIDCConfig, OIDCUserConfig } from "./index.js"

/** @see [Claims](https://learn.microsoft.com/en-us/azure/active-directory-b2c/tokens-overview#claims) */
export interface AzureADB2CProfile {
  exp: number
  nbf: number
  ver: string
  iss: string
  sub: string
  aud: string
  iat: number
  auth_time: number
  oid: string
  country: string
  name: string
  postalCode: string
  emails: string[]
  tfp: string
}

/**
 * Add Azure AD B2C login to your page.
 *
 *
 * ## Configuration
 *
 * ### Basic
 *
 * Basic configuration sets up Azure AD B2C to return an ID Token. This should be done as a prerequisite prior to running through the Advanced configuration.
 *
 * 1. [Azure AD B2C Tenant](https://docs.microsoft.com/en-us/azure/active-directory-b2c/tutorial-create-tenant)
 * 2. [App Registration](https://docs.microsoft.com/en-us/azure/active-directory-b2c/tutorial-register-applications)
 * 3. [User Flow](https://docs.microsoft.com/en-us/azure/active-directory-b2c/tutorial-create-user-flows)
 *
 * For the step "User attributes and token claims" set the following:
 *
 * - Collect attribute:
 *   - Email Address
 *   - Display Name
 *   - Given Name
 *   - Surname
 * - Return claim:
 *   - Email Addresses
 *   - Display Name
 *   - Given Name
 *   - Surname
 *   - Identity Provider
 *   - Identity Provider Access Token
 *   - User's Object ID
 *
 * @example
 *
 * ```ts
 * import { Auth } from "@auth/core"
 * import AzureADB2C from "@auth/core/providers/azure-ad-b2c"
 *
 * const request = new Request("https://example.com")
 * const response = await AuthHandler(request, {
 *   // optionally, you can pass `tenantId` and `primaryUserFlow` instead of `issuer`
 *   providers: [AzureADB2C({ clientId: "", clientSecret: "", issuer: "" })],
 * })
 * ```
 *
 * ---
 *
 * ### Resources
 *
 * - [Azure Active Directory B2C documentation](https://learn.microsoft.com/en-us/azure/active-directory-b2c)
 *
 * ---
 *
 * ### Notes
 *
 * By default, Auth.js assumes that the Azure AD B2C provider is
 * based on the [OIDC](https://openid.net/specs/openid-connect-core-1_0.html) specification.
 *
 * :::tip
 *
 * The Azure AD B2C provider comes with a [default configuration](https://github.com/nextauthjs/next-auth/blob/main/packages/core/src/providers/azure-ad-b2c.ts).
 * To override the defaults for your use case, check out [customizing a built-in OAuth provider](https://authjs.dev/guides/providers/custom-provider#override-default-options).
 *
 * :::
 *
 * :::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 AzureADB2C(
  options: OIDCUserConfig<AzureADB2CProfile> & {
    primaryUserFlow?: string
    tenantId?: string
  }
): OIDCConfig<AzureADB2CProfile> {
  const { tenantId, primaryUserFlow } = options
  options.issuer ??= `https://${tenantId}.b2clogin.com/${tenantId}.onmicrosoft.com/${primaryUserFlow}/v2.0`
  return {
    id: "azure-ad-b2c",
    name: "Azure Active Directory B2C",
    type: "oidc",
    profile(profile) {
      return {
        id: profile.sub,
        name: profile.name,
        email: profile?.emails?.[0],
        image: null,
      }
    },
    style: { logo: "/azure.svg", text: "#fff", bg: "#0072c6" },
    options,
  }
}