import { afterEach, describe, expect, it } from 'vitest';
import { act } from '@testing-library/react';

import { parseGatewaySnapshot } from '@/api/gateway';
import { dispatchGatewayEvent, useGatewayStore } from '@/stores/gateway';
import { useSessionStore } from '@/stores/session';
import { makeReadySnapshot } from './helpers';

afterEach(() => {
  useSessionStore.getState().reset();
  useGatewayStore.setState({
    status: 'idle',
    heartbeatIntervalMs: null,
    sessionId: null,
    attempts: 0,
    invalidated: false,
  });
});

describe('session store', () => {
  it('applies a READY snapshot: guilds, channels and session id', () => {
    const snapshot = parseGatewaySnapshot(
      makeReadySnapshot([
        {
          id: 'g-1',
          name: 'Main',
          is_main: true,
          channels: [
            { id: 'c-1', name: 'general', position: 0 },
            { id: 'c-2', name: 'voice', type: 'voice', position: 1 },
          ],
        },
      ]),
    );
    expect(snapshot).not.toBeNull();

    act(() => {
      dispatchGatewayEvent({ op: 0, t: 'READY', s: 1, d: makeReadySnapshot([
        {
          id: 'g-1',
          name: 'Main',
          is_main: true,
          channels: [
            { id: 'c-1', name: 'general', position: 0 },
            { id: 'c-2', name: 'voice', type: 'voice', position: 1 },
          ],
        },
      ]) });
    });

    const state = useSessionStore.getState();
    expect(state.guilds).toHaveLength(1);
    expect(state.guilds[0]?.name).toBe('Main');
    expect(state.guilds[0]?.channels.map((channel) => channel.id)).toEqual(['c-1', 'c-2']);
    expect(state.sessionId).toBe('session-1');
    expect(state.user?.display_name).toBe('Alice');
    expect(useGatewayStore.getState().status).toBe('connected');
    expect(useGatewayStore.getState().heartbeatIntervalMs).toBe(45_000);
  });

  it('keeps channels with can_send=false (only can_view=false is hidden)', () => {
    act(() => {
      dispatchGatewayEvent({
        op: 0,
        t: 'READY',
        s: 2,
        d: makeReadySnapshot([
          {
            id: 'g-1',
            name: 'Main',
            channels: [
              { id: 'c-readonly', name: 'announcements', can_send: false },
              { id: 'c-hidden', name: 'secret', can_view: false },
            ],
          },
        ]),
      });
    });

    const channels = useSessionStore.getState().guilds[0]?.channels ?? [];
    expect(channels.map((channel) => channel.id)).toEqual(['c-readonly', 'c-hidden']);
  });

  it('ignores unknown events and malformed snapshots', () => {
    act(() => {
      dispatchGatewayEvent({ op: 0, t: 'SOMETHING_NEW', s: 3, d: { anything: true } });
      dispatchGatewayEvent({ op: 0, t: 'READY', s: 4, d: { guilds: [] } });
    });

    expect(useSessionStore.getState().guilds).toEqual([]);
    expect(useSessionStore.getState().user).toBeNull();
  });

  it('drops a guild and clears the selection when leaving', () => {
    act(() => {
      dispatchGatewayEvent({
        op: 0,
        t: 'READY',
        s: 5,
        d: makeReadySnapshot([{ id: 'g-1', name: 'Main' }]),
      });
      useSessionStore.getState().selectChannel('g-1', null);
      useSessionStore.getState().removeGuild('g-1');
    });

    const state = useSessionStore.getState();
    expect(state.guilds).toEqual([]);
    expect(state.selectedGuildId).toBeNull();
  });
});