import { ANONYMOUS_PRINCIPAL, createAuthenticatedPrincipal } from "@ekklesia/contracts";
import type { EkklesiaIdentityRuntime } from "@ekklesia/core/identity";
import { IdentityRuntimeError } from "@ekklesia/core/identity";
import { describe, expect, it, vi } from "vitest";
import { createApiApp } from "../src/app.js";

const trustedOrigin = "https://dashboard.example.test";
const untrustedOrigin = "https://evil.example.test";

function fakeRuntime(overrides: Partial<EkklesiaIdentityRuntime> = {}): EkklesiaIdentityRuntime {
  return {
    handleAuthRequest: vi.fn().mockResolvedValue(new Response("auth-ok", { status: 200 })),
    resolvePrincipal: vi.fn().mockResolvedValue(ANONYMOUS_PRINCIPAL),
    ...overrides,
  };
}

describe("Ekklesia API Hono application", () => {
  it("mounts Better Auth exactly under /api/auth/*", async () => {
    const runtime = fakeRuntime();
    const app = createApiApp({ runtime, trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/auth/sign-in/email", { method: "POST" });

    expect(response.status).toBe(200);
    expect(await response.text()).toBe("auth-ok");
    expect(runtime.handleAuthRequest).toHaveBeenCalledTimes(1);
  });

  it("does not route requests outside /api/auth/* to Better Auth", async () => {
    const runtime = fakeRuntime();
    const app = createApiApp({ runtime, trustedOrigins: [trustedOrigin] });

    const response = await app.request("/sign-in/email", { method: "POST" });

    expect(response.status).toBe(404);
    expect(runtime.handleAuthRequest).not.toHaveBeenCalled();
  });

  it("returns the anonymous principal shape with no-store caching", async () => {
    const runtime = fakeRuntime({
      resolvePrincipal: vi.fn().mockResolvedValue(ANONYMOUS_PRINCIPAL),
    });
    const app = createApiApp({ runtime, trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/v1/principal");

    expect(response.status).toBe(200);
    expect(await response.json()).toEqual({ kind: "anonymous" });
    expect(response.headers.get("cache-control")).toBe("no-store");
    expect(response.headers.get("vary")).toContain("Cookie");
  });

  it("returns the authenticated principal shape containing only kind and userId", async () => {
    const runtime = fakeRuntime({
      resolvePrincipal: vi.fn().mockResolvedValue(createAuthenticatedPrincipal("user_123")),
    });
    const app = createApiApp({ runtime, trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/v1/principal");
    const body = (await response.json()) as Record<string, unknown>;

    expect(response.status).toBe(200);
    expect(body).toEqual({ kind: "authenticated", userId: "user_123" });
    expect(Object.keys(body).sort()).toEqual(["kind", "userId"]);
  });

  it("returns a stable sanitized 503 when principal resolution fails, never a false anonymous 200", async () => {
    const runtime = fakeRuntime({
      resolvePrincipal: vi
        .fn()
        .mockRejectedValue(new IdentityRuntimeError("PRINCIPAL_RESOLUTION_FAILED")),
    });
    const app = createApiApp({ runtime, trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/v1/principal");

    expect(response.status).toBe(503);
    expect(await response.json()).toEqual({ code: "PRINCIPAL_RESOLUTION_FAILED" });
    expect(response.headers.get("cache-control")).toBe("no-store");
  });

  it("returns a stable sanitized 500 for an unexpected auth-handler failure, never a raw message", async () => {
    const runtime = fakeRuntime({
      handleAuthRequest: vi.fn().mockRejectedValue(new Error("postgresql://admin:secret@db/x")),
    });
    const app = createApiApp({ runtime, trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/auth/sign-in/email", { method: "POST" });
    const body = await response.json();

    expect(response.status).toBe(500);
    expect(body).toEqual({ code: "INTERNAL_ERROR" });
    expect(JSON.stringify(body)).not.toContain("secret");
    expect(JSON.stringify(body)).not.toContain("postgresql://");
  });

  it("has deterministic 404 behavior for an unknown route", async () => {
    const app = createApiApp({ runtime: fakeRuntime(), trustedOrigins: [trustedOrigin] });

    const response = await app.request("/does-not-exist");

    expect(response.status).toBe(404);
    expect(await response.json()).toEqual({ code: "NOT_FOUND" });
  });

  it("reflects an allowed origin in Access-Control-Allow-Origin with credentials support", async () => {
    const app = createApiApp({ runtime: fakeRuntime(), trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/v1/principal", {
      headers: { origin: trustedOrigin },
    });

    expect(response.headers.get("access-control-allow-origin")).toBe(trustedOrigin);
    expect(response.headers.get("access-control-allow-credentials")).toBe("true");
  });

  it("never returns Access-Control-Allow-Origin for a disallowed origin", async () => {
    const app = createApiApp({ runtime: fakeRuntime(), trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/v1/principal", {
      headers: { origin: untrustedOrigin },
    });

    expect(response.headers.get("access-control-allow-origin")).toBeNull();
  });

  it("supports requests with no Origin header at all (native/server clients)", async () => {
    const app = createApiApp({ runtime: fakeRuntime(), trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/v1/principal");

    expect(response.status).toBe(200);
  });

  it("handles preflight OPTIONS requests deterministically for an allowed origin", async () => {
    const app = createApiApp({ runtime: fakeRuntime(), trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/v1/principal", {
      headers: {
        "access-control-request-method": "GET",
        origin: trustedOrigin,
      },
      method: "OPTIONS",
    });

    expect(response.status).toBe(204);
    expect(response.headers.get("access-control-allow-origin")).toBe(trustedOrigin);
  });

  it("never wildcards Access-Control-Allow-Origin", async () => {
    const app = createApiApp({ runtime: fakeRuntime(), trustedOrigins: [trustedOrigin] });

    const response = await app.request("/api/v1/principal", {
      headers: { origin: trustedOrigin },
    });

    expect(response.headers.get("access-control-allow-origin")).not.toBe("*");
  });

  // "No generalized session/user object stored in Hono context" is verified by construction
  // rather than by a black-box context probe: unlike Better Auth's own documented Hono example
  // (which hydrates `c.set("user", session.user)` on every request), createApiApp never calls
  // `c.set` at all — the only per-request identity data that ever exists is the narrow
  // EkklesiaPrincipal returned directly from the /api/v1/principal handler above, whose exact
  // shape (kind + userId only) is already asserted by the principal-shape tests in this file.
});