/**
 * ZITADEL API client for portal-driven registration (Option B).
 *
 * Uses v2 APIs:
 *   - OrganizationService: POST /v2/organizations
 *   - UserService:         POST /v2/users/new + POST /v2/users/{id}/invite
 *   - ProjectService:      Connect RPC CreateProjectGrant
 *   - AuthorizationService: Connect RPC CreateAuthorization
 *
 * Registration flow (invite-based):
 *   1. Create Org
 *   2. Create User (no password, email unverified)
 *   3. Send invite → ZITADEL emails a link to set password + verify email
 *   4. Create Project Grant
 *   5. Create Authorization (role assignment)
 *
 * Auth: pieced-sa PAT (Personal Access Token) — passed as Bearer token.
 * The SA must have IAM_OWNER role to create orgs cross-tenant.
 */

const ZITADEL_URL = process.env.ZITADEL_ISSUER!; // https://auth.pieced.ch
const ZITADEL_SA_PAT = process.env.ZITADEL_SA_PAT!;
const ZITADEL_PROJECT_ID = process.env.ZITADEL_PROJECT_ID!; // 367435120493199793

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

async function zitadelFetch<T>(
  path: string,
  method: string = "GET",
  body?: unknown,
  headers?: Record<string, string>
): Promise<T> {
  const url = `${ZITADEL_URL}${path}`;
  const res = await fetch(url, {
    method,
    headers: {
      "Content-Type": "application/json",
      Accept: "application/json",
      Authorization: `Bearer ${ZITADEL_SA_PAT}`,
      ...headers,
    },
    body: body ? JSON.stringify(body) : undefined,
  });

  if (!res.ok) {
    const text = await res.text();
    const err = new Error(`ZITADEL ${method} ${path}: ${res.status} ${text}`);
    (err as any).statusCode = res.status;
    throw err;
  }
  return res.json() as Promise<T>;
}

/**
 * Connect RPC call — ZITADEL v2 services use Connect protocol.
 * Same as REST but requires Connect-Protocol-Version header.
 */
async function connectRpc<T>(
  service: string,
  method: string,
  body: unknown
): Promise<T> {
  return zitadelFetch<T>(
    `/${service}/${method}`,
    "POST",
    body,
    { "Connect-Protocol-Version": "1" }
  );
}

// ---------------------------------------------------------------------------
// v2 Organization API — REST
// ---------------------------------------------------------------------------

export interface CreateOrgResult {
  organizationId: string;
  creationDate: string;
}

export async function createOrganization(
  name: string
): Promise<CreateOrgResult> {
  return zitadelFetch<CreateOrgResult>("/v2/organizations", "POST", {
    name,
  });
}

// ---------------------------------------------------------------------------
// v2 User API — REST
// ---------------------------------------------------------------------------

export interface CreateUserResult {
  id: string;
  creationDate: string;
  emailCode?: string;
}

/**
 * Create a human user in a specific organization WITHOUT a password.
 * The user cannot log in until they complete the invite flow
 * (set password + verify email via the link in the invite email).
 *
 * POST /v2/users/new
 */
export async function createHumanUser(params: {
  orgId: string;
  email: string;
  givenName: string;
  familyName: string;
  preferredLanguage?: string;
}): Promise<CreateUserResult> {
  return zitadelFetch<CreateUserResult>("/v2/users/new", "POST", {
    organizationId: params.orgId,
    human: {
      profile: {
        givenName: params.givenName,
        familyName: params.familyName,
        displayName: `${params.givenName} ${params.familyName}`,
        preferredLanguage: params.preferredLanguage || "en",
      },
      email: {
        email: params.email,
        // Not verified — invite flow will handle verification
      },
    },
    // No password — user sets it via invite link
  });
}

/**
 * Send an invitation email to the user.
 * The email contains a link where the user sets their password
 * (or passkey/IdP) and verifies their email address in one step.
 *
 * Requires SMTP to be configured in ZITADEL.
 * If SMTP is not configured, this call succeeds but no email is sent.
 *
 * POST /v2/users/{userId}/invite
 */
export async function createInviteCode(userId: string): Promise<void> {
  await zitadelFetch(`/v2/users/${userId}/invite`, "POST", {
    sendCode: {},
  });
}

// ---------------------------------------------------------------------------
// v2 Project API — Connect RPC
// ---------------------------------------------------------------------------

export interface ProjectGrantResult {
  projectGrantId: string;
  creationDate: string;
}

/**
 * Grant the "OpenClaw Platform" project to a customer organization.
 * Connect RPC: zitadel.project.v2.ProjectService/CreateProjectGrant
 */
export async function createProjectGrant(
  grantedOrgId: string,
  roleKeys?: string[]
): Promise<ProjectGrantResult> {
  return connectRpc<ProjectGrantResult>(
    "zitadel.project.v2.ProjectService",
    "CreateProjectGrant",
    {
      projectId: ZITADEL_PROJECT_ID,
      grantedOrganizationId: grantedOrgId,
      roleKeys: roleKeys || ["owner"],
    }
  );
}

// ---------------------------------------------------------------------------
// v2 Authorization API — Connect RPC
// ---------------------------------------------------------------------------

export interface AuthorizationResult {
  id: string;
  creationDate: string;
}

/**
 * Create a role assignment (authorization) for a user.
 * This makes the role appear in the JWT claims.
 * Connect RPC: zitadel.authorization.v2.AuthorizationService/CreateAuthorization
 */
export async function createAuthorization(params: {
  userId: string;
  projectId?: string;
  organizationId: string;
  roleKeys?: string[];
}): Promise<AuthorizationResult> {
  return connectRpc<AuthorizationResult>(
    "zitadel.authorization.v2.AuthorizationService",
    "CreateAuthorization",
    {
      userId: params.userId,
      projectId: params.projectId || ZITADEL_PROJECT_ID,
      organizationId: params.organizationId,
      roleKeys: params.roleKeys || ["owner"],
    }
  );
}

// ---------------------------------------------------------------------------
// Delete Organization (for rollback on partial failure)
// ---------------------------------------------------------------------------

export async function deleteOrganization(orgId: string): Promise<void> {
  await zitadelFetch(`/v2/organizations/${orgId}`, "DELETE");
}

// ---------------------------------------------------------------------------
// Full registration flow
// ---------------------------------------------------------------------------

export interface RegistrationResult {
  orgId: string;
  userId: string;
  projectGrantId: string;
}

/**
 * Complete registration flow:
 * 1. Create ZITADEL Org
 * 2. Create Human User (no password, email unverified)
 * 3. Send invite code (ZITADEL emails link to set password + verify email)
 * 4. Create Project Grant (link OpenClaw Platform project to new org)
 * 5. Create Authorization (assign "owner" role to user)
 *
 * If any step after org creation fails, the org is deleted (rollback).
 */
export async function registerCustomer(params: {
  companyName: string;
  email: string;
  givenName: string;
  familyName: string;
  preferredLanguage?: string;
}): Promise<RegistrationResult> {
  // 1. Create org
  const org = await createOrganization(params.companyName);

  try {
    // 2. Create user in org (no password)
    const user = await createHumanUser({
      orgId: org.organizationId,
      email: params.email,
      givenName: params.givenName,
      familyName: params.familyName,
      preferredLanguage: params.preferredLanguage,
    });

    // 3. Send invite — user receives email to set password + verify email
    try {
      await createInviteCode(user.id);
    } catch (inviteErr) {
      // Log but don't fail — SMTP may not be configured yet.
      // Admin can resend the invite later from ZITADEL console.
      console.warn(
        `Invite email could not be sent for user ${user.id} (SMTP may not be configured):`,
        inviteErr
      );
    }

    // 4. Grant project to org
    const grant = await createProjectGrant(org.organizationId, ["owner"]);

    // 5. Assign "owner" role to user
    await createAuthorization({
      userId: user.id,
      organizationId: org.organizationId,
      roleKeys: ["owner"],
    });

    return {
      orgId: org.organizationId,
      userId: user.id,
      projectGrantId: grant.projectGrantId,
    };
  } catch (err) {
    // Rollback: delete the org so the customer can retry
    console.error(
      `Registration failed after org creation (${org.organizationId}), rolling back:`,
      err
    );
    try {
      await deleteOrganization(org.organizationId);
      console.log(`Rolled back org ${org.organizationId}`);
    } catch (rollbackErr) {
      console.error(
        `Failed to rollback org ${org.organizationId}:`,
        rollbackErr
      );
    }
    throw err;
  }
}