import { stripTrailingSlashes } from "../utils/urlSanitize.ts";

export const AZURE_AI_DEFAULT_BASE_URL = "https://example-resource.services.ai.azure.com/openai/v1";

function normalizeBaseUrl(value: string | null | undefined): string {
  return stripTrailingSlashes((value || "").trim());
}

export function normalizeAzureAiBaseUrl(value: string | null | undefined): string {
  const normalized = normalizeBaseUrl(value || AZURE_AI_DEFAULT_BASE_URL);
  if (!normalized) return AZURE_AI_DEFAULT_BASE_URL;

  if (
    normalized.endsWith("/chat/completions") ||
    normalized.endsWith("/responses") ||
    normalized.endsWith("/models")
  ) {
    return normalized.replace(/\/(?:chat\/completions|responses|models)$/i, "");
  }

  if (normalized.endsWith("/openai/v1") || normalized.endsWith("/v1")) {
    return normalized;
  }

  if (normalized.endsWith("/openai")) {
    return `${normalized}/v1`;
  }

  const parsed = new URL(normalized);
  if (
    parsed.hostname.endsWith(".services.ai.azure.com") ||
    parsed.hostname.endsWith(".openai.azure.com")
  ) {
    if (!parsed.pathname || parsed.pathname === "/") {
      parsed.pathname = "/openai/v1";
      return stripTrailingSlashes(parsed.toString());
    }
  }

  return normalized;
}

export function buildAzureAiChatUrl(
  value: string | null | undefined,
  apiType: "chat" | "responses" = "chat"
): string {
  const normalized = normalizeAzureAiBaseUrl(value);
  return `${normalized}/${apiType === "responses" ? "responses" : "chat/completions"}`;
}

export function buildAzureAiModelsUrl(value: string | null | undefined): string {
  return `${normalizeAzureAiBaseUrl(value)}/models`;
}