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

const LAUREN = 'lauren@seahavenind.com';
const ADAM = 'adam@seahavenind.com';

describe('InMemoryTasksClient', () => {
  describe('createTask', () => {
    it('returns a task with a generated id and completed:false', async () => {
      const client = new InMemoryTasksClient();
      const task = await client.createTask({ sub: LAUREN, title: 'Buy gloves' });
      expect(task.taskId).toMatch(/^task-\d{4}$/);
      expect(task.sub).toBe(LAUREN);
      expect(task.title).toBe('Buy gloves');
      expect(task.completed).toBe(false);
      expect(task.createdAt).toBeDefined();
      expect(task.description).toBeUndefined();
    });

    it('carries an optional description through', async () => {
      const client = new InMemoryTasksClient();
      const task = await client.createTask({ sub: LAUREN, title: 'T', description: 'detail' });
      expect(task.description).toBe('detail');
    });

    it('a task created for sub A is not visible to sub B (partitioned)', async () => {
      const client = new InMemoryTasksClient();
      const task = await client.createTask({ sub: LAUREN, title: 'Lauren only' });
      const adamTasks = await client.listTasks({ sub: ADAM, includeCompleted: true });
      expect(adamTasks.map((t) => t.taskId)).not.toContain(task.taskId);
      const laurenTasks = await client.listTasks({ sub: LAUREN, includeCompleted: true });
      expect(laurenTasks.map((t) => t.taskId)).toContain(task.taskId);
    });

    it('creates a task for a previously-unknown sub', async () => {
      const client = new InMemoryTasksClient();
      const task = await client.createTask({ sub: 'fresh@seahavenind.com', title: 'First' });
      const tasks = await client.listTasks({
        sub: 'fresh@seahavenind.com',
        includeCompleted: true,
      });
      expect(tasks.map((t) => t.taskId)).toEqual([task.taskId]);
    });
  });

  describe('listTasks', () => {
    it('omits completed tasks by default', async () => {
      const client = new InMemoryTasksClient();
      const tasks = await client.listTasks({ sub: LAUREN });
      const ids = tasks.map((t) => t.taskId);
      expect(ids).toContain('task-0001'); // open
      expect(ids).not.toContain('task-0002'); // completed
    });

    it('includes completed tasks when includeCompleted is true', async () => {
      const client = new InMemoryTasksClient();
      const tasks = await client.listTasks({ sub: LAUREN, includeCompleted: true });
      const ids = tasks.map((t) => t.taskId);
      expect(ids).toContain('task-0001');
      expect(ids).toContain('task-0002');
    });

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

  describe('completeTask', () => {
    it('sets completed and completedAt', async () => {
      const client = new InMemoryTasksClient();
      const completed = await client.completeTask({ sub: LAUREN, taskId: 'task-0001' });
      expect(completed.completed).toBe(true);
      expect(completed.completedAt).toBeDefined();
      // now omitted from the default (open-only) listing
      const open = await client.listTasks({ sub: LAUREN });
      expect(open.map((t) => t.taskId)).not.toContain('task-0001');
    });

    it('throws for an unknown taskId', async () => {
      const client = new InMemoryTasksClient();
      await expect(client.completeTask({ sub: LAUREN, taskId: 'task-missing' })).rejects.toThrow(
        /not found/,
      );
    });

    it('throws when the task belongs to another sub', async () => {
      const client = new InMemoryTasksClient();
      await expect(client.completeTask({ sub: ADAM, taskId: 'task-0001' })).rejects.toThrow(
        /not found/,
      );
    });
  });

  describe('deleteTask', () => {
    it('removes the task so subsequent listings omit it', async () => {
      const client = new InMemoryTasksClient();
      await client.deleteTask({ sub: LAUREN, taskId: 'task-0001' });
      const tasks = await client.listTasks({ sub: LAUREN, includeCompleted: true });
      expect(tasks.map((t) => t.taskId)).not.toContain('task-0001');
    });

    it('is a no-op for an unknown taskId', async () => {
      const client = new InMemoryTasksClient();
      await expect(
        client.deleteTask({ sub: LAUREN, taskId: 'task-missing' }),
      ).resolves.toBeUndefined();
      const tasks = await client.listTasks({ sub: LAUREN, includeCompleted: true });
      expect(tasks).toHaveLength(2);
    });

    it('is a no-op for an unknown sub', async () => {
      const client = new InMemoryTasksClient();
      await expect(
        client.deleteTask({ sub: 'nobody@example.com', taskId: 'task-0001' }),
      ).resolves.toBeUndefined();
    });
  });
});