import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { DATABASE_DIALECT_ENV } from "../../../database/db/dialect.js";

// getDb() throws unless a database was initialized; the context's handle is
// not what this file is about.
vi.mock("../../../database/db/index.js", () => ({
  getDb: vi.fn(() => ({})),
  getSqlite: () => ({}),
  DatabaseSaveTrigger: { forceSave: vi.fn(), triggerSave: vi.fn() },
}));

const {
  createCurrentAuditLogRepository,
  createCurrentSessionRepository,
  createCurrentRepositoryContext,
  createCurrentRepositoryWriteHook,
  createCurrentRepositoryLazyWriteHook,
} = await import("../../../database/repositories/factory.js");

// Neither cross-dialect harness reaches this function: both
// tests/database/repositories/test-support.ts and scripts/verify-dialects.mjs
// construct a DatabaseContext of their own. That is why the production path
// could report "sqlite" while connected to MySQL with CI green on all three
// engines, and why this asserts on the real factory rather than a fixture.
describe("createCurrentRepositoryContext", () => {
  const saved = process.env[DATABASE_DIALECT_ENV];

  beforeEach(() => {
    delete process.env[DATABASE_DIALECT_ENV];
  });

  afterEach(() => {
    if (saved === undefined) delete process.env[DATABASE_DIALECT_ENV];
    else process.env[DATABASE_DIALECT_ENV] = saved;
  });

  it("defaults to sqlite when nothing is configured", () => {
    expect(createCurrentRepositoryContext().dialect).toBe("sqlite");
  });

  it("reports the configured dialect", () => {
    for (const dialect of ["sqlite", "postgres", "mysql"]) {
      process.env[DATABASE_DIALECT_ENV] = dialect;
      expect(createCurrentRepositoryContext().dialect).toBe(dialect);
    }
  });

  it("rejects an unsupported dialect rather than falling back to sqlite", () => {
    process.env[DATABASE_DIALECT_ENV] = "oracle";
    expect(() => createCurrentRepositoryContext()).toThrow(/oracle/);
  });
});

describe("createCurrentRepositoryWriteHook", () => {
  const saved = process.env[DATABASE_DIALECT_ENV];

  afterEach(() => {
    if (saved === undefined) delete process.env[DATABASE_DIALECT_ENV];
    else process.env[DATABASE_DIALECT_ENV] = saved;
  });

  it("installs a persist hook only for sqlite", () => {
    process.env[DATABASE_DIALECT_ENV] = "sqlite";
    expect(createCurrentRepositoryWriteHook("test")).toBeTypeOf("function");

    for (const dialect of ["postgres", "mysql"]) {
      process.env[DATABASE_DIALECT_ENV] = dialect;
      expect(createCurrentRepositoryWriteHook("test")).toBeUndefined();
    }
  });
});

describe("createCurrentRepositoryLazyWriteHook", () => {
  const saved = process.env[DATABASE_DIALECT_ENV];

  afterEach(() => {
    if (saved === undefined) delete process.env[DATABASE_DIALECT_ENV];
    else process.env[DATABASE_DIALECT_ENV] = saved;
  });

  it("installs a debounced persist hook only for sqlite", () => {
    process.env[DATABASE_DIALECT_ENV] = "sqlite";
    expect(createCurrentRepositoryLazyWriteHook("test")).toBeTypeOf("function");

    for (const dialect of ["postgres", "mysql"]) {
      process.env[DATABASE_DIALECT_ENV] = dialect;
      expect(createCurrentRepositoryLazyWriteHook("test")).toBeUndefined();
    }
  });
});

it("wires SQLite activity to the periodic flush and token changes to immediate persistence", async () => {
  const saved = process.env[DATABASE_DIALECT_ENV];
  process.env[DATABASE_DIALECT_ENV] = "sqlite";
  const { getDb } = await import("../../../database/db/index.js");
  const { DatabaseSaveTrigger } =
    await import("../../../utils/database-save-trigger.js");
  const dirty = vi
    .spyOn(DatabaseSaveTrigger, "markDirty")
    .mockImplementation(() => {});
  const force = vi.spyOn(DatabaseSaveTrigger, "forceSave").mockResolvedValue();
  const query = {
    update: () => query,
    set: () => query,
    where: async () => ({ changes: 1 }),
  };
  vi.mocked(getDb).mockReturnValue(
    query as unknown as ReturnType<typeof getDb>,
  );
  try {
    const repo = createCurrentSessionRepository();
    await repo.touch("session-1");
    expect(dirty).toHaveBeenCalledOnce();
    expect(force).not.toHaveBeenCalled();
    await repo.updateToken("session-1", "new-token");
    expect(force).toHaveBeenCalledOnce();
  } finally {
    vi.restoreAllMocks();
    if (saved === undefined) delete process.env[DATABASE_DIALECT_ENV];
    else process.env[DATABASE_DIALECT_ENV] = saved;
  }
});

// Audit rows land on every audited call; a forced save per row rewrote the
// whole SQLite file each time.
it("saves SQLite audit rows lazily instead of forcing a save per row", async () => {
  const saved = process.env[DATABASE_DIALECT_ENV];
  process.env[DATABASE_DIALECT_ENV] = "sqlite";
  const { getDb } = await import("../../../database/db/index.js");
  const { DatabaseSaveTrigger } =
    await import("../../../utils/database-save-trigger.js");
  const lazy = vi.spyOn(DatabaseSaveTrigger, "triggerSave").mockResolvedValue();
  const force = vi.spyOn(DatabaseSaveTrigger, "forceSave").mockResolvedValue();
  const query = {
    insert: () => query,
    values: async () => ({ changes: 1 }),
    select: () => query,
    from: async () => [{ count: 1 }],
  };
  vi.mocked(getDb).mockReturnValue(
    query as unknown as ReturnType<typeof getDb>,
  );
  try {
    const repo = createCurrentAuditLogRepository();
    for (let i = 0; i < 100; i++) {
      await repo.create({
        userId: null,
        username: "plugin:host-metrics",
        action: "plugin_db_client",
        resourceType: "plugin",
        success: true,
      });
    }
    expect(force).not.toHaveBeenCalled();
    expect(lazy).toHaveBeenCalledTimes(100);
  } finally {
    vi.restoreAllMocks();
    if (saved === undefined) delete process.env[DATABASE_DIALECT_ENV];
    else process.env[DATABASE_DIALECT_ENV] = saved;
  }
});