import { describe, it, expect } from 'vitest';
import { InMemoryCalendarClient } from '../src/dev-client.js';

const WIDE = { timeMin: '2026-01-01T00:00:00Z', timeMax: '2026-12-31T23:59:59Z' };

describe('InMemoryCalendarClient', () => {
  describe('getEvents', () => {
    it("returns lauren's seeded events partitioned by userSub", async () => {
      const client = new InMemoryCalendarClient();
      const events = await client.getEvents('lauren@seahavenind.com', WIDE);
      const ids = events.map((e) => e.id);
      expect(ids).toContain('evt-lauren-001');
      expect(ids).toContain('evt-lauren-002');
      expect(events).toHaveLength(2);
    });

    it("returns adam's own events, not lauren's", async () => {
      const client = new InMemoryCalendarClient();
      const events = await client.getEvents('adam@seahavenind.com', WIDE);
      const ids = events.map((e) => e.id);
      expect(ids).toEqual(['evt-adam-001']);
      expect(ids).not.toContain('evt-lauren-001');
    });

    it('returns an empty list for an unknown sub', async () => {
      const client = new InMemoryCalendarClient();
      const events = await client.getEvents('nobody@example.com', WIDE);
      expect(events).toEqual([]);
    });

    it('filters by the time window', async () => {
      const client = new InMemoryCalendarClient();
      const events = await client.getEvents('lauren@seahavenind.com', {
        timeMin: '2026-06-26T00:00:00Z',
        timeMax: '2026-06-27T00:00:00Z',
      });
      expect(events.map((e) => e.id)).toEqual(['evt-lauren-002']);
    });

    it('respects maxResults', async () => {
      const client = new InMemoryCalendarClient();
      const events = await client.getEvents('lauren@seahavenind.com', {
        ...WIDE,
        maxResults: 1,
      });
      expect(events).toHaveLength(1);
    });
  });

  describe('checkAvailability', () => {
    it('reports busy slots and free gaps around them', async () => {
      const client = new InMemoryCalendarClient();
      const result = await client.checkAvailability('lauren@seahavenind.com', WIDE);
      expect(result.busy).toHaveLength(2);
      expect(result.busy[0]).toEqual({
        start: '2026-06-25T15:00:00Z',
        end: '2026-06-25T15:30:00Z',
      });
      expect(result.free.length).toBeGreaterThan(0);
      // window starts before first busy slot -> a leading free gap exists
      expect(Date.parse(result.free[0].start)).toBe(Date.parse(WIDE.timeMin));
    });

    it('returns the full window as free when there are no events', async () => {
      const client = new InMemoryCalendarClient();
      const result = await client.checkAvailability('nobody@example.com', WIDE);
      expect(result.busy).toEqual([]);
      expect(result.free).toEqual([
        {
          start: new Date(Date.parse(WIDE.timeMin)).toISOString(),
          end: new Date(Date.parse(WIDE.timeMax)).toISOString(),
        },
      ]);
    });
  });

  describe('createEvent', () => {
    it('appends the new event and returns it', async () => {
      const client = new InMemoryCalendarClient();
      const created = await client.createEvent('lauren@seahavenind.com', {
        summary: 'New planning session',
        description: 'Discuss Q3 roadmap',
        start: '2026-07-01T16:00:00Z',
        end: '2026-07-01T17:00:00Z',
        attendees: [
          { email: 'adam@seahavenind.com', displayName: 'Adam' },
          { email: 'x@example.com' },
        ],
      });
      expect(created.id).toMatch(/^evt-dev-\d+$/);
      expect(created.summary).toBe('New planning session');
      expect(created.description).toBe('Discuss Q3 roadmap');
      expect(created.status).toBe('confirmed');
      expect(created.attendees).toEqual([
        { email: 'adam@seahavenind.com', displayName: 'Adam', responseStatus: 'needsAction' },
        { email: 'x@example.com', responseStatus: 'needsAction' },
      ]);

      const events = await client.getEvents('lauren@seahavenind.com', WIDE);
      expect(events.map((e) => e.id)).toContain(created.id);
      expect(events).toHaveLength(3);
    });

    it('creates an event for a previously-unknown sub', async () => {
      const client = new InMemoryCalendarClient();
      const created = await client.createEvent('fresh@seahavenind.com', {
        summary: 'First event',
        start: '2026-07-02T16:00:00Z',
        end: '2026-07-02T17:00:00Z',
      });
      expect(created.summary).toBe('First event');
      expect(created.description).toBeUndefined();
      expect(created.attendees).toBeUndefined();
      const events = await client.getEvents('fresh@seahavenind.com', WIDE);
      expect(events).toHaveLength(1);
    });
  });
});