// 任务列表组织纯函数测试（方案 A R1）。
import { describe, it, expect } from 'vitest'
import { groupByProject, groupByTimeline, relativeTime, filterTasks } from '../src/tasklist'
import type { Conversation, Project } from '../src/contracts'

const NOW = new Date('2026-09-30T15:00:00').getTime()
const H = 3_600_000

function conv(id: string, projectId: string, updatedAt: string, extra: Partial<Conversation> = {}): Conversation {
  return { id, projectId, title: id, createdAt: updatedAt, updatedAt, ...extra }
}

describe('groupByProject', () => {
  it('groups tasks under projects in project order and never drops orphans', () => {
    const projects: Project[] = [
      { id: 'p2', name: '乙', createdAt: '', updatedAt: '' },
      { id: 'p1', name: '甲', createdAt: '', updatedAt: '' },
    ]
    const tasks = [conv('a', 'p1', '2026-09-30T10:00:00Z'), conv('b', 'p2', '2026-09-29T10:00:00Z'), conv('c', 'pX', '2026-09-28T10:00:00Z')]
    const groups = groupByProject(tasks, projects)
    expect(groups.map(g => g.label)).toEqual(['乙', '甲', '未分组'])
    expect(groups[0].projectId).toBe('p2')
    expect(groups[2].tasks.map(t => t.id)).toEqual(['c'])
  })
  it('skips projects with zero visible tasks', () => {
    const projects: Project[] = [{ id: 'p1', name: '甲', createdAt: '', updatedAt: '' }]
    expect(groupByProject([], projects)).toEqual([])
  })
})

describe('groupByTimeline', () => {
  it('buckets by local day and week boundaries', () => {
    // NOW=周三 15:00（本地）；构造今天/昨天/本周更早（周一）/更早 各一条。
    const tasks = [
      conv('today', 'p', new Date(NOW - H).toISOString()),
      conv('yesterday', 'p', new Date(NOW - 26 * H).toISOString()),
      conv('week', 'p', new Date(NOW - 50 * H).toISOString()),
      conv('older', 'p', new Date(NOW - 10 * 24 * H).toISOString()),
    ]
    const groups = groupByTimeline(tasks, NOW)
    expect(groups.map(g => g.label)).toEqual(['今天', '昨天', '本周更早', '更早'])
    expect(groups[0].tasks[0].id).toBe('today')
  })
  it('hides empty buckets and tolerates bad timestamps', () => {
    const groups = groupByTimeline([conv('x', 'p', 'not-a-date')], NOW)
    expect(groups).toHaveLength(1)
    expect(groups[0].label).toBe('更早')
  })
})

describe('relativeTime', () => {
  it('formats gradients and year rollover', () => {
    expect(relativeTime(new Date(NOW - 30_000).toISOString(), NOW)).toBe('刚刚')
    expect(relativeTime(new Date(NOW - 5 * 60_000).toISOString(), NOW)).toBe('5 分钟')
    expect(relativeTime(new Date(NOW - 3 * H).toISOString(), NOW)).toBe('3 小时')
    expect(relativeTime(new Date(NOW - 30 * H).toISOString(), NOW)).toBe('昨天')
    expect(relativeTime(new Date(NOW - 3 * 24 * H).toISOString(), NOW)).toBe('3 天')
    expect(relativeTime('2026-05-01T00:00:00', NOW)).toBe('5/1')
    expect(relativeTime('2025-12-31T00:00:00', NOW)).toBe('2025/12/31')
    expect(relativeTime('bad')).toBe('')
  })
})

describe('filterTasks', () => {
  it('matches title case-insensitively and passes through on empty query', () => {
    const tasks = [conv('a', 'p', '', { title: '周报 Draft' }), conv('b', 'p', '', { title: '接口评审' })]
    expect(filterTasks(tasks, '周报')).toEqual([tasks[0]])
    expect(filterTasks(tasks, '  ')).toEqual(tasks)
    expect(filterTasks(tasks, 'DRAFT')).toEqual([tasks[0]])
  })
})