import { describe, expect, it } from "vitest";
import { ApiConfigError, createApiRuntimeConfig } from "../src/config.js";

const validSecret = "correct-horse-battery-staple-0123456789";

function validInput() {
  return {
    databaseUrl: "postgresql://ekklesia:ekklesia@127.0.0.1:5432/ekklesia",
    host: "127.0.0.1",
    identity: {
      baseUrl: "https://identity.example.test",
      secret: validSecret,
      trustedOrigins: ["https://identity.example.test"],
    },
    port: 3000,
  };
}

describe("API runtime configuration", () => {
  it("accepts valid API and identity configuration", () => {
    const config = createApiRuntimeConfig(validInput(), { environment: "production" });

    expect(config).toEqual({
      databaseUrl: validInput().databaseUrl,
      host: "127.0.0.1",
      identity: {
        baseUrl: "https://identity.example.test",
        secret: validSecret,
        trustedOrigins: ["https://identity.example.test"],
      },
      port: 3000,
    });
    expect(Object.isFrozen(config)).toBe(true);
  });

  it("defaults host to loopback and port to 3000 when omitted", () => {
    const { host: _host, port: _port, ...rest } = validInput();
    const config = createApiRuntimeConfig(rest, { environment: "production" });

    expect(config.host).toBe("127.0.0.1");
    expect(config.port).toBe(3000);
  });

  it("permits an explicit non-loopback bind address", () => {
    const config = createApiRuntimeConfig(
      { ...validInput(), host: "0.0.0.0" },
      { environment: "production" },
    );

    expect(config.host).toBe("0.0.0.0");
  });

  it("rejects a missing database URL", () => {
    let captured: unknown;
    try {
      createApiRuntimeConfig({ ...validInput(), databaseUrl: undefined });
    } catch (error) {
      captured = error;
    }
    expect(captured).toBeInstanceOf(ApiConfigError);
    expect(captured).toMatchObject({ code: "DATABASE_URL_MISSING" });
  });

  it("rejects an invalid database URL", () => {
    for (const databaseUrl of ["", "not-a-url", "mysql://example.test/db", "http://example.test"]) {
      let captured: unknown;
      try {
        createApiRuntimeConfig({ ...validInput(), databaseUrl });
      } catch (error) {
        captured = error;
      }
      expect(captured).toBeInstanceOf(ApiConfigError);
    }
  });

  it("rejects an empty listen host", () => {
    let captured: unknown;
    try {
      createApiRuntimeConfig({ ...validInput(), host: "" });
    } catch (error) {
      captured = error;
    }
    expect(captured).toMatchObject({ code: "HOST_INVALID" });
  });

  it("rejects an invalid listen port", () => {
    for (const port of [-1, 1.5, 70_000, Number.NaN, "not-a-port"]) {
      let captured: unknown;
      try {
        createApiRuntimeConfig({ ...validInput(), port });
      } catch (error) {
        captured = error;
      }
      expect(captured).toMatchObject({ code: "PORT_INVALID" });
    }
  });

  it("accepts port 0 as an explicit request for an OS-assigned ephemeral port", () => {
    const config = createApiRuntimeConfig({ ...validInput(), port: 0 });
    expect(config.port).toBe(0);
  });

  it("delegates identity validation to Core's createIdentityConfig, rejecting a short secret", () => {
    let captured: unknown;
    try {
      createApiRuntimeConfig({
        ...validInput(),
        identity: { ...validInput().identity, secret: "too-short" },
      });
    } catch (error) {
      captured = error;
    }
    expect(captured).toMatchObject({ code: "SECRET_TOO_SHORT" });
  });

  it("explicitly allows local development origins only when environment is development", () => {
    const config = createApiRuntimeConfig(
      {
        databaseUrl: validInput().databaseUrl,
        host: "127.0.0.1",
        identity: {
          baseUrl: "http://localhost:3000",
          secret: validSecret,
          trustedOrigins: ["http://localhost:3000"],
        },
        port: 3000,
      },
      { environment: "development" },
    );

    expect(config.identity.baseUrl).toBe("http://localhost:3000");
  });

  it("never leaks the database URL, secret, or trusted origins through a thrown error", () => {
    const hostileUrl = "postgresql://admin:s3cr3t@db.internal.example:5432/ekklesia";
    let captured: unknown;
    try {
      createApiRuntimeConfig({ ...validInput(), databaseUrl: hostileUrl, port: -1 });
    } catch (error) {
      captured = error;
    }

    expect(captured).toBeInstanceOf(ApiConfigError);
    const publicText = `${String(captured)}\n${
      captured instanceof Error ? (captured.stack ?? "") : ""
    }\n${JSON.stringify(captured)}`;
    expect(publicText).not.toContain(hostileUrl);
    expect(publicText).not.toContain("s3cr3t");
    expect(publicText).not.toContain("db.internal.example");
  });
});