import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { RudderClient } from '../src/client/RudderClient.js';
import {
  RudderError,
  RudderNetworkError,
  RudderHttpError,
  RudderAuthError,
  SDK_ERROR_INVALID_OPTIONS,
} from '../src/client/RudderError.js';
import { createFakeTokenStore } from './helpers/FakeTokenStore.js';

describe('RudderClient', () => {
  afterEach(() => {
    vi.unstubAllGlobals();
  });

  it('constructs with valid options', () => {
    const client = new RudderClient({
      baseUrl: 'https://api.example.com',
      projectKey: 'proj_123',
      tokenStore: createFakeTokenStore(),
    });
    expect(client.auth).toBeDefined();
  });

  it('throws RudderError with sdk/invalid-options if baseUrl is missing', () => {
    let caught: unknown;
    try {
      new RudderClient({ baseUrl: '', projectKey: 'proj_123' });
    } catch (error) {
      caught = error;
    }
    expect(caught).toBeInstanceOf(RudderError);
    expect((caught as RudderError).code).toBe(SDK_ERROR_INVALID_OPTIONS);
    expect((caught as Error).message).toContain('baseUrl');
  });

  it('throws RudderError with sdk/invalid-options if projectKey is missing', () => {
    let caught: unknown;
    try {
      new RudderClient({ baseUrl: 'https://api.example.com', projectKey: '' });
    } catch (error) {
      caught = error;
    }
    expect(caught).toBeInstanceOf(RudderError);
    expect((caught as RudderError).code).toBe(SDK_ERROR_INVALID_OPTIONS);
    expect((caught as Error).message).toContain('projectKey');
  });

  it('creates a default localStorage-backed token store when tokenStore is omitted', () => {
    localStorage.clear();
    const client = new RudderClient({
      baseUrl: 'https://api.example.com',
      projectKey: 'proj_123',
    });
    client.options.tokenStore.saveTokens('at', 'rt');
    expect(localStorage.getItem('rudder_access_token')).toBe('at');
    expect(client.options.tokenStore.getAccessToken()).toBe('at');
    client.options.tokenStore.clear();
  });

  it('falls back to an in-memory token store when localStorage is unavailable', () => {
    vi.stubGlobal('localStorage', undefined);
    const client = new RudderClient({
      baseUrl: 'https://api.example.com',
      projectKey: 'proj_123',
    });
    client.options.tokenStore.saveTokens('at', 'rt');
    expect(client.options.tokenStore.getAccessToken()).toBe('at');
    expect(client.options.tokenStore.getRefreshToken()).toBe('rt');
    client.options.tokenStore.clear();
    expect(client.options.tokenStore.getAccessToken()).toBeNull();
  });
});

describe('transport error mapping', () => {
  let client: RudderClient;

  beforeEach(() => {
    client = new RudderClient({
      baseUrl: 'https://api.example.com',
      projectKey: 'proj_123',
      tokenStore: createFakeTokenStore(),
    });
  });

  it('throws RudderNetworkError with the underlying error as cause', async () => {
    const underlying = new Error('Network down');
    vi.stubGlobal('fetch', vi.fn().mockRejectedValue(underlying));
    let caught: unknown;
    await client.player.reload().catch((error) => {
      caught = error;
    });
    expect(caught).toBeInstanceOf(RudderNetworkError);
    expect((caught as RudderNetworkError).cause).toBe(underlying);
  });

  it('throws RudderAuthError on 401', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue(
      new Response('unauthorized', { status: 401, statusText: 'Unauthorized' }),
    ));
    await expect(client.player.reload())
      .rejects.toThrow(RudderAuthError);
  });

  it('throws RudderHttpError with the server error code on non-401 HTTP error', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue(
      new Response(JSON.stringify({ code: 'run_expired', error: 'gone' }), {
        status: 410,
        statusText: 'Gone',
      }),
    ));
    let caught: unknown;
    await client.player.reload().catch((error) => {
      caught = error;
    });
    expect(caught).toBeInstanceOf(RudderHttpError);
    expect((caught as RudderHttpError).code).toBe('run_expired');
  });

  it('returns undefined for 204 No Content', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue(
      new Response(null, { status: 204, statusText: 'No Content' }),
    ));
    const result = await client.storage.save([]);
    expect(result).toBeUndefined();
  });

  it('returns parsed JSON for 200 responses', async () => {
    vi.stubGlobal('fetch', vi.fn().mockResolvedValue(
      new Response(JSON.stringify({ player: { id: 'player-1' }, wallets: [] }), { status: 200 }),
    ));
    const result = await client.player.reload();
    expect(result).toEqual({ player: { id: 'player-1' }, wallets: [] });
  });
});

describe('lazy scenario runtime', () => {
  beforeEach(() => {
    localStorage.clear();
  });

  afterEach(() => {
    vi.unstubAllGlobals();
  });

  it('does not create the scenario runtime until first use', async () => {
    const client = new RudderClient({
      baseUrl: 'https://api.example.com',
      projectKey: 'proj_123',
      runtime: { loginEvent: null },
    });
    const internals = client as unknown as {
      scenarioRuntime: unknown;
      ensureScenarioRuntime(): Promise<unknown>;
    };
    expect(internals.scenarioRuntime).toBeNull();
    await internals.ensureScenarioRuntime();
    expect(internals.scenarioRuntime).not.toBeNull();
  });

  it('delivers effects to handlers subscribed before the runtime is ready', async () => {
    const client = new RudderClient({
      baseUrl: 'https://api.example.com',
      projectKey: 'proj_123',
      runtime: {},
    });

    const notifications: string[] = [];
    client.effects.onNotification((effect) => {
      notifications.push(effect.message);
      return effect.done();
    });

    vi.stubGlobal('fetch', vi.fn().mockImplementation((url: string, init?: RequestInit) => {
      const path = new URL(url).pathname;
      if (path === '/sdk/v1/authorization/device') {
        return Promise.resolve(new Response(
          JSON.stringify({ accessToken: 'at', refreshToken: 'rt' }),
          { status: 200 },
        ));
      }
      if (path === '/sdk/v1/scenarios/trigger') {
        return Promise.resolve(new Response(JSON.stringify({
          effects: [{
            runId: 'run-1',
            scenarioId: 'scenario-1',
            nodeId: 'start',
            type: 'notification',
            data: { message: 'Welcome!' },
          }],
        }), { status: 200 }));
      }
      if (path === '/sdk/v1/scenarios/pending') {
        return Promise.resolve(new Response(JSON.stringify({ effects: [] }), { status: 200 }));
      }
      if (path === '/sdk/v1/remote-configs') {
        return Promise.resolve(new Response(JSON.stringify({ configs: {} }), { status: 200 }));
      }
      if (path === '/sdk/v1/stores') {
        return Promise.resolve(new Response(JSON.stringify({ stores: [], total: 0 }), { status: 200 }));
      }
      if (path === '/sdk/v1/catalog') {
        return Promise.resolve(new Response(JSON.stringify({ items: [] }), { status: 200 }));
      }
      if (path === '/sdk/v1/sync') {
        return Promise.resolve(new Response(JSON.stringify({}), { status: 200 }));
      }
      void init;
      return Promise.resolve(new Response(JSON.stringify({ player: null, wallets: [] }), { status: 200 }));
    }));

    await client.auth.loginWithDevice();
    await vi.waitFor(() => expect(notifications).toEqual(['Welcome!']));
    client.dispose();
  });
});