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

const clientConstructor = vi.hoisted(() => vi.fn());

vi.mock("pg", () => ({ Client: clientConstructor }));

import {
  createPostgresMigrationDatabase,
  MIGRATION_CONNECTION_TIMEOUT_MS,
  MIGRATION_OPERATION_TIMEOUT_MS,
  PostgresMigrationDatabaseError,
} from "../src/migrations/postgres-database.js";

describe("PostgreSQL migration database composition", () => {
  it("does not construct a client or execute SQL merely because the adapter is imported", () => {
    expect(clientConstructor).not.toHaveBeenCalled();
  });

  it.each([
    undefined,
    "",
    "not-a-database-url",
    "https://admin:do-not-log@db.example.test/database",
  ])("rejects missing or invalid configuration without exposing it (%s)", (databaseUrl) => {
    let captured: unknown;
    try {
      createPostgresMigrationDatabase(databaseUrl);
    } catch (error) {
      captured = error;
    }

    expect(captured).toBeInstanceOf(PostgresMigrationDatabaseError);
    expect(captured).toMatchObject({ code: "POSTGRES_MIGRATION_CONFIGURATION_INVALID" });
    const publicText = `${String(captured)}\n${
      captured instanceof Error ? (captured.stack ?? "") : ""
    }\n${JSON.stringify(captured)}`;
    if (databaseUrl) {
      expect(publicText).not.toContain(databaseUrl);
    }
    expect(clientConstructor).not.toHaveBeenCalled();
  });

  it("creates a lazy database composition without opening a connection", () => {
    const database = createPostgresMigrationDatabase(
      "postgresql://operator:do-not-log@example.test/ekklesia",
    );

    expect(Object.isFrozen(database)).toBe(true);
    expect(clientConstructor).not.toHaveBeenCalled();
    expect(JSON.stringify(database)).not.toContain("operator");
    expect(JSON.stringify(database)).not.toContain("do-not-log");
    expect(JSON.stringify(database)).not.toContain("example.test");
  });

  it.each([
    ["connectionTimeoutMs", 0],
    ["connectionTimeoutMs", -1],
    ["connectionTimeoutMs", 1.5],
    ["connectionTimeoutMs", Number.NaN],
    ["connectionTimeoutMs", Number.POSITIVE_INFINITY],
    ["connectionTimeoutMs", 2_147_483_648],
    ["operationTimeoutMs", 0],
    ["operationTimeoutMs", -1],
    ["operationTimeoutMs", 1.5],
    ["operationTimeoutMs", Number.NaN],
    ["operationTimeoutMs", Number.POSITIVE_INFINITY],
    ["operationTimeoutMs", 2_147_483_648],
  ] as const)("rejects an invalid %s value without constructing a client", (name, value) => {
    let captured: unknown;
    try {
      createPostgresMigrationDatabase("postgresql://example.test/ekklesia", {
        [name]: value,
      });
    } catch (error) {
      captured = error;
    }

    expect(captured).toBeInstanceOf(PostgresMigrationDatabaseError);
    expect(captured).toMatchObject({ code: "POSTGRES_MIGRATION_CONFIGURATION_INVALID" });
    expect(clientConstructor).not.toHaveBeenCalled();
  });

  it("passes bounded connection and operation timeouts to the PostgreSQL client", async () => {
    const client = {
      connect: vi.fn().mockResolvedValue(undefined),
      end: vi.fn().mockResolvedValue(undefined),
      on: vi.fn(),
    };
    const MockClient = class {
      readonly connect = client.connect;
      readonly end = client.end;
      readonly on = client.on;
    };
    clientConstructor.mockImplementation(MockClient as unknown as () => typeof client);

    const database = createPostgresMigrationDatabase("postgresql://example.test/ekklesia", {
      connectionTimeoutMs: 10_000,
      operationTimeoutMs: 12_000,
    });
    const session = await database.openSession();

    expect(clientConstructor).toHaveBeenCalledWith({
      connectionString: "postgresql://example.test/ekklesia",
      connectionTimeoutMillis: 10_000,
      query_timeout: 12_000,
      statement_timeout: 12_000,
    });
    expect(client.on).toHaveBeenCalledWith("error", expect.any(Function));
    expect(client.connect).toHaveBeenCalledOnce();

    await session.close();
    expect(client.end).toHaveBeenCalledOnce();
  });
});

/**
 * Pass 4: finite migration timeouts live at this one construction boundary, and the pinned driver's
 * connection-string precedence cannot weaken them.
 */
describe("PostgreSQL migration timeout policy", () => {
  function mockClient() {
    const client = {
      connect: vi.fn().mockResolvedValue(undefined),
      end: vi.fn().mockResolvedValue(undefined),
      on: vi.fn(),
    };
    clientConstructor.mockImplementation(
      class {
        readonly connect = client.connect;
        readonly end = client.end;
        readonly on = client.on;
      } as unknown as () => typeof client,
    );
    return client;
  }

  it("applies the fixed 10-second defaults when a caller omits them", async () => {
    mockClient();

    const database = createPostgresMigrationDatabase("postgresql://example.test/ekklesia");
    const session = await database.openSession();

    // This is exactly what `migrations:plan` and `migrations:apply` construct: no timeout options.
    expect(clientConstructor).toHaveBeenCalledWith({
      connectionString: "postgresql://example.test/ekklesia",
      connectionTimeoutMillis: MIGRATION_CONNECTION_TIMEOUT_MS,
      query_timeout: MIGRATION_OPERATION_TIMEOUT_MS,
      statement_timeout: MIGRATION_OPERATION_TIMEOUT_MS,
    });
    expect(MIGRATION_CONNECTION_TIMEOUT_MS).toBe(10_000);
    expect(MIGRATION_OPERATION_TIMEOUT_MS).toBe(10_000);

    await session.close();
  });

  it("still honours an explicit narrower test override", async () => {
    mockClient();

    const database = createPostgresMigrationDatabase("postgresql://example.test/ekklesia", {
      connectionTimeoutMs: 250,
      operationTimeoutMs: 500,
    });
    const session = await database.openSession();

    expect(clientConstructor).toHaveBeenCalledWith({
      connectionString: "postgresql://example.test/ekklesia",
      connectionTimeoutMillis: 250,
      query_timeout: 500,
      statement_timeout: 500,
    });

    await session.close();
  });

  it.each([
    "postgresql://example.test/ekklesia?statement_timeout=0",
    "postgresql://example.test/ekklesia?STATEMENT_TIMEOUT=0",
    "postgresql://example.test/ekklesia?query_timeout=0",
    "postgresql://example.test/ekklesia?connect_timeout=0",
    "postgresql://example.test/ekklesia?options=-c%20statement_timeout%3D0",
    "postgresql://example.test/ekklesia?statement_timeout=900000",
  ])("refuses a connection string that would override the policy (%s)", (databaseUrl) => {
    // The pinned pg@8.22.0 merges as `Object.assign({}, config, parse(connectionString))`, so the
    // URL wins over the explicit values above — verified against the real driver, where an explicit
    // `statement_timeout: 10000` alongside `?statement_timeout=0` produced a server-reported `0`.
    const constructionsBefore = clientConstructor.mock.calls.length;
    let captured: unknown;
    try {
      createPostgresMigrationDatabase(databaseUrl);
    } catch (error) {
      captured = error;
    }

    expect(captured).toBeInstanceOf(PostgresMigrationDatabaseError);
    expect(captured).toMatchObject({ code: "POSTGRES_MIGRATION_CONFIGURATION_INVALID" });
    // The rejection never echoes the URL, the offending parameter, or its value.
    const publicText = `${String(captured)}\n${
      captured instanceof Error ? (captured.stack ?? "") : ""
    }`;
    expect(publicText).not.toContain("example.test");
    expect(publicText).not.toContain("statement_timeout=");
    expect(publicText).not.toContain("900000");
    // Rejected before any client is constructed, so no connection is ever attempted.
    expect(clientConstructor.mock.calls.length).toBe(constructionsBefore);
  });

  it("leaves unrelated connection-string parameters alone", async () => {
    mockClient();

    const database = createPostgresMigrationDatabase(
      "postgresql://example.test/ekklesia?application_name=ekklesia&lock_timeout=5000",
    );
    const session = await database.openSession();

    expect(clientConstructor).toHaveBeenCalledWith(
      expect.objectContaining({ statement_timeout: MIGRATION_OPERATION_TIMEOUT_MS }),
    );

    await session.close();
  });
});

/**
 * Pass 4 correction: `pg-connection-string` retains *arbitrary* query keys, so the driver's own
 * configuration key `connectionTimeoutMillis` reaches `ConnectionParameters` from a URL. It was not
 * on the rejected list. These pin the corrected boundary; the measured effect of each key on the
 * real driver and a real server lives in `core/tests/postgres-migration.integration.ts`.
 */
describe("PostgreSQL migration timeout precedence", () => {
  it.each([
    "postgresql://example.test/ekklesia?connectionTimeoutMillis=0",
    "postgresql://example.test/ekklesia?connectionTimeoutMillis=900000",
    "postgresql://example.test/ekklesia?connectionTimeoutMillis=",
    "postgresql://example.test/ekklesia?connectionTimeoutMillis=-1",
    "postgresql://example.test/ekklesia?connectionTimeoutMillis=abc",
    "postgresql://example.test/ekklesia?CONNECTIONTIMEOUTMILLIS=0",
    "postgresql://example.test/ekklesia?connectiontimeoutmillis=0",
  ])("refuses the driver's own connectionTimeoutMillis key in a URL (%s)", (databaseUrl) => {
    const constructionsBefore = clientConstructor.mock.calls.length;
    let captured: unknown;
    try {
      createPostgresMigrationDatabase(databaseUrl);
    } catch (error) {
      captured = error;
    }

    expect(captured).toBeInstanceOf(PostgresMigrationDatabaseError);
    expect(captured).toMatchObject({ code: "POSTGRES_MIGRATION_CONFIGURATION_INVALID" });
    // Rejected before any client exists, so no connection is ever attempted.
    expect(clientConstructor.mock.calls.length).toBe(constructionsBefore);
    const publicText = `${String(captured)}\n${
      captured instanceof Error ? (captured.stack ?? "") : ""
    }`;
    expect(publicText).not.toContain("example.test");
    expect(publicText).not.toContain("connectionTimeoutMillis");
    expect(publicText).not.toContain("900000");
  });

  it("also refuses it alongside a narrower explicit test override", () => {
    let captured: unknown;
    try {
      createPostgresMigrationDatabase(
        "postgresql://example.test/ekklesia?connectionTimeoutMillis=0",
        { connectionTimeoutMs: 300, operationTimeoutMs: 300 },
      );
    } catch (error) {
      captured = error;
    }
    expect(captured).toMatchObject({ code: "POSTGRES_MIGRATION_CONFIGURATION_INVALID" });
  });

  it("still accepts unrelated parameters and produces the exact expected client configuration", async () => {
    const client = {
      connect: vi.fn().mockResolvedValue(undefined),
      end: vi.fn().mockResolvedValue(undefined),
      on: vi.fn(),
    };
    clientConstructor.mockImplementation(
      class {
        readonly connect = client.connect;
        readonly end = client.end;
        readonly on = client.on;
      } as unknown as () => typeof client,
    );

    const url = "postgresql://example.test/ekklesia?application_name=ekklesia&lock_timeout=5000";
    const session = await createPostgresMigrationDatabase(url).openSession();

    expect(clientConstructor).toHaveBeenLastCalledWith({
      connectionString: url,
      connectionTimeoutMillis: MIGRATION_CONNECTION_TIMEOUT_MS,
      query_timeout: MIGRATION_OPERATION_TIMEOUT_MS,
      statement_timeout: MIGRATION_OPERATION_TIMEOUT_MS,
    });

    await session.close();
  });
});