import type { AddressAvailability } from "../services/practiceAddressApi";

declare const AKASHIC_STACK: string | undefined;

// The host a practice answers at on this build's stack: a founder is shown it before it is permanent.
// Read from the build constant, not `environment`, so this module stays free of `window`.
export const SUFFIX_BY_STACK: Record<string, string> = {
  staging: ".staging.akashic.health",
  sandbox: ".staging.akashic.health",
  prod: ".akashic.health",
};

export const ADDRESS_SUFFIX = SUFFIX_BY_STACK[typeof AKASHIC_STACK === "string" ? AKASHIC_STACK : "prod"] ?? ".akashic.health";

// A check belongs to the label it was asked about, so an answer for an earlier label never
// enables saving a newer one (permanent hostname ruling, 2026-09-18).
export type AddressCheck = { label: string; state: AddressAvailability | "checking" };

export const normalizeAddressLabel = (value: string): string => value.trim().toLowerCase();

export const isAddressReady = (value: string, check: AddressCheck | undefined): boolean =>
  check !== undefined && check.state === "available" && check.label === normalizeAddressLabel(value);

export type AddressStatus = { tone: "ok" | "pending" | "problem"; text: string; retry?: boolean };

export const addressStatus = (
  value: string,
  check: AddressCheck | undefined,
  suggested: boolean,
): AddressStatus | undefined => {
  const label = normalizeAddressLabel(value);
  if (!label) return undefined;
  if (!check || check.label !== label || check.state === "checking") {
    return { tone: "pending", text: "Checking availability…" };
  }
  switch (check.state) {
    case "available":
      return { tone: "ok", text: suggested ? "Available · suggested from your practice name" : "Available" };
    case "taken":
      return { tone: "problem", text: "This name is already taken. Choose another name." };
    case "reserved":
      return { tone: "problem", text: "This name is reserved. Choose another name." };
    case "invalid":
      return { tone: "problem", text: "Use three to sixty-three letters a–z, with no numbers, spaces or other characters." };
    default:
      return { tone: "problem", text: "We could not check this name just now.", retry: true };
  }
};