import { describe, expect, it } from "vitest";

import { backendBaseUrl, joinBackendPath, resolveBackendUrl } from "./runtime-config";
import cases from "./backend-url-cases.json";

describe("resolveBackendUrl", () => {
  it("uses the runtime-injected backend URL", () => {
    expect(resolveBackendUrl({ backendBaseUrl: "/api" })).toBe("/api");
  });

  it("falls back to the Vite backend URL", () => {
    expect(resolveBackendUrl(undefined)).toBe(import.meta.env.VITE_BACKEND_URL ?? "");
  });

  it("preserves the client default when Vite has no configured backend", () => {
    expect(backendBaseUrl).toBe(import.meta.env.VITE_BACKEND_URL ?? "http://localhost:8787");
  });

  it.each(["/backend", "api", "//evil.test", "ftp://example.test", "https://user:pass@example.test"])(
    "rejects unsupported backend URL %j",
    (backendBaseUrl) => {
      expect(() => resolveBackendUrl({ backendBaseUrl })).toThrow(/BACKEND_BASE_URL/);
    },
  );

  it.each(["", "/", "/api", "/api/", "http://localhost:8787", "https://api.example.test/v1"])(
    "accepts supported backend URL %j",
    (backendBaseUrl) => {
      expect(resolveBackendUrl({ backendBaseUrl })).toBe(backendBaseUrl);
    },
  );

  it.each(cases)("applies the canonical policy to $value", ({ value, valid }) => {
    const resolve = () => resolveBackendUrl({ backendBaseUrl: value });
    if (valid) expect(resolve()).toBe(value);
    else expect(resolve).toThrow(/BACKEND_BASE_URL/);
  });
});

describe("joinBackendPath", () => {
  it.each([
    ["", "/sessions/s1", "/sessions/s1"],
    ["/", "/sessions/s1", "/sessions/s1"],
    ["/api", "/sessions/s1", "/api/sessions/s1"],
    ["/api/", "/sessions/s1", "/api/sessions/s1"],
    ["https://example.test/api", "/sessions/s1", "https://example.test/api/sessions/s1"],
    ["https://example.test/api/", "sessions/s1", "https://example.test/api/sessions/s1"],
  ])("joins base %j and path %j", (base, path, expected) => {
    expect(joinBackendPath(base, path)).toBe(expected);
  });
});