import { describe, expect, it } from "vitest";
import { ApiConfigError, apiTrustedOrigins, 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({
      clientAddress: { mode: "direct" },
      // Production defaults to certificate-verified TLS with no configuration at all.
      databaseTransport: { mode: "verify-full" },
      databaseUrl: validInput().databaseUrl,
      host: "127.0.0.1",
      identity: {
        baseUrl: "https://identity.example.test",
        // Defaults to the identity base URL: the Dashboard and the API share one origin unless a
        // deployment separates them (ADR 0038).
        dashboardOrigin: "https://identity.example.test",
        publicSignupEnabled: false,
        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("defaults public signup to disabled and threads an explicit development enablement through to identity config", () => {
    expect(createApiRuntimeConfig(validInput()).identity.publicSignupEnabled).toBe(false);
    expect(
      createApiRuntimeConfig(
        {
          ...validInput(),
          identity: {
            baseUrl: "http://localhost:3000",
            publicSignupEnabled: true,
            secret: validSecret,
            trustedOrigins: ["http://localhost:3000"],
          },
        },
        { environment: "development" },
      ).identity.publicSignupEnabled,
    ).toBe(true);
  });

  it("refuses a production runtime configuration that enables public signup, before any resource is constructed", () => {
    let captured: unknown;
    try {
      createApiRuntimeConfig(
        {
          ...validInput(),
          identity: { ...validInput().identity, publicSignupEnabled: true },
        },
        { environment: "production" },
      );
    } catch (error) {
      captured = error;
    }
    expect(captured).toMatchObject({ code: "PUBLIC_SIGNUP_UNSUPPORTED_IN_PRODUCTION" });
  });

  it("defaults client-address configuration to direct mode and threads explicit trusted-proxy configuration through", () => {
    expect(createApiRuntimeConfig(validInput()).clientAddress).toEqual({ mode: "direct" });

    const config = createApiRuntimeConfig({
      ...validInput(),
      clientAddress: {
        header: "x-forwarded-for",
        mode: "trusted-proxy",
        trustedProxies: ["10.0.0.1"],
      },
    });
    expect(config.clientAddress).toEqual({
      header: "x-forwarded-for",
      mode: "trusted-proxy",
      trustedProxies: ["10.0.0.1"],
    });
  });

  describe("PostgreSQL transport policy", () => {
    it("defaults to certificate-verified TLS in production and plaintext in development", () => {
      expect(createApiRuntimeConfig(validInput()).databaseTransport).toEqual({
        mode: "verify-full",
      });
      expect(
        createApiRuntimeConfig(
          {
            ...validInput(),
            identity: {
              baseUrl: "http://localhost:3000",
              secret: validSecret,
              trustedOrigins: ["http://localhost:3000"],
            },
          },
          { environment: "development" },
        ).databaseTransport,
      ).toEqual({ mode: "disable" });
    });

    it("refuses a production configuration that disables TLS", () => {
      let captured: unknown;
      try {
        createApiRuntimeConfig(
          { ...validInput(), databaseTransport: { mode: "disable" } },
          { environment: "production" },
        );
      } catch (error) {
        captured = error;
      }
      expect(captured).toMatchObject({ code: "DATABASE_TLS_REQUIRED_IN_PRODUCTION" });
    });

    it("rejects a malformed or loosely spelled TLS mode in every environment, without coercion", () => {
      for (const mode of [
        "VERIFY-FULL",
        " verify-full ",
        "require",
        "verify-ca",
        "prefer",
        "no-verify",
        "true",
        true,
        1,
        "",
      ]) {
        for (const environment of ["production", "development"] as const) {
          let captured: unknown;
          try {
            createApiRuntimeConfig(
              {
                ...validInput(),
                databaseTransport: { mode },
                ...(environment === "development"
                  ? {
                      identity: {
                        baseUrl: "http://localhost:3000",
                        secret: validSecret,
                        trustedOrigins: ["http://localhost:3000"],
                      },
                    }
                  : {}),
              },
              { environment },
            );
          } catch (error) {
            captured = error;
          }
          expect(captured, `expected mode ${JSON.stringify(mode)} to be rejected`).toMatchObject({
            code: "DATABASE_TLS_MODE_INVALID",
          });
        }
      }
    });

    it("rejects a database URL carrying its own TLS parameters, which the pinned driver would let override the policy", () => {
      for (const parameter of [
        "sslmode=disable",
        "sslmode=require",
        "sslmode=verify-full",
        "ssl=true",
        "sslrootcert=/tmp/ca.crt",
        "sslcert=/tmp/c.crt",
        "sslkey=/tmp/c.key",
        "uselibpqcompat=true",
      ]) {
        let captured: unknown;
        try {
          createApiRuntimeConfig(
            {
              ...validInput(),
              databaseUrl: `postgresql://ekklesia:ekklesia@db.example.test:5432/ekklesia?${parameter}`,
            },
            { environment: "production" },
          );
        } catch (error) {
          captured = error;
        }
        expect(captured, `expected ${parameter} to be rejected`).toMatchObject({
          code: "DATABASE_TLS_CONNECTION_STRING_CONFLICT",
        });
      }
    });

    it("never leaks the database URL, credentials, host, or CA material through a transport error", () => {
      let captured: unknown;
      try {
        createApiRuntimeConfig(
          {
            ...validInput(),
            databaseTransport: { certificateAuthority: "-----BEGIN CERTIFICATE-----SECRET" },
            databaseUrl:
              "postgresql://admin:hunter2@db.internal.example:5432/ekklesia?sslmode=disable",
          },
          { environment: "production" },
        );
      } catch (error) {
        captured = error;
      }
      const publicText = `${String(captured)}\n${
        captured instanceof Error ? (captured.stack ?? "") : ""
      }\n${JSON.stringify(captured)}`;
      expect(publicText).not.toContain("hunter2");
      expect(publicText).not.toContain("db.internal.example");
      expect(publicText).not.toContain("SECRET");
      expect(publicText).not.toContain("sslmode");
    });
  });

  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");
  });
});

describe("the API's trusted browser origins (ADR 0045)", () => {
  it("adds the API's own origin to the configured ones, as Better Auth does", () => {
    const origins = apiTrustedOrigins({
      baseUrl: "https://api.example.test",
      trustedOrigins: ["https://dash.example.test"],
    });

    expect(origins).toEqual(["https://dash.example.test", "https://api.example.test"]);
    expect(Object.isFrozen(origins)).toBe(true);
  });

  it("does not duplicate an API origin already listed (the same-origin topology)", () => {
    expect(
      apiTrustedOrigins({
        baseUrl: "https://ekklesia.example.test",
        trustedOrigins: ["https://ekklesia.example.test"],
      }),
    ).toEqual(["https://ekklesia.example.test"]);
  });
});