import { describe, expect, it } from 'vitest'
import { filterTasks, groupTaskTree, moveItemWithinScope, renderMarkdown, toDateTimeLocal } from './task-utils'

type SearchTask = {
  id: string
  title: string
  description?: string
  parent_id?: string | null
  completed?: boolean
  list_name?: string
}

const tasks: SearchTask[] = [
  { id: '1', title: 'Write release notes', description: 'mention **API**', parent_id: null, completed: false },
  { id: '2', title: 'Check links', description: '', parent_id: '1', completed: false },
  { id: '3', title: 'Buy milk', description: '', parent_id: null, completed: true },
]

describe('task utilities', () => {
  it('filters task titles and markdown descriptions case-insensitively', () => {
    expect(filterTasks(tasks, 'api').map((task) => task.id)).toEqual(['1'])
    expect(filterTasks(tasks, 'WRITE').map((task) => task.id)).toEqual(['1'])
  })

  it('keeps a one-level subtask tree without duplicating children', () => {
    expect(groupTaskTree(tasks)).toEqual([{ task: tasks[0], subtasks: [tasks[1]] }, { task: tasks[2], subtasks: [] }])
  })

  it('moves an item before or after another item without changing other scopes', () => {
    const rows = [
      { id: 'a', parent_id: null },
      { id: 'a1', parent_id: 'a' },
      { id: 'b', parent_id: null },
      { id: 'c', parent_id: null },
    ]
    expect(moveItemWithinScope(rows, 'c', 'a', 'before').map((row) => row.id)).toEqual(['c', 'a1', 'a', 'b'])
    expect(moveItemWithinScope(rows, 'a', 'c', 'after').map((row) => row.id)).toEqual(['b', 'a1', 'c', 'a'])
    expect(moveItemWithinScope(rows, 'a1', 'b', 'before')).toEqual(rows)
  })

  it('renders safe basic markdown and strips unsafe html', () => {
    const html = renderMarkdown('# Plan\n**bold** [link](https://example.com)\n<script>alert(1)</script>')
    expect(html).toContain('<h1>Plan</h1>')
    expect(html).toContain('<strong>bold</strong>')
    expect(html).toContain('rel="noopener noreferrer"')
    expect(html).not.toContain('<script>')
  })

  it('filters titles, descriptions, and list names', () => {
    const searchable: SearchTask[] = [
      ...tasks,
      { id: '4', title: 'Plan', list_name: '工作清单' },
    ]
    expect(filterTasks(searchable, '工作').map((task) => task.id)).toEqual(['4'])
  })

  it('formats API dates in local wall-clock time', () => {
    const original = process.env.TZ
    process.env.TZ = 'Asia/Shanghai'
    expect(toDateTimeLocal('2026-09-05T12:30:00Z')).toBe('2026-09-05T20:30')
    process.env.TZ = original
    expect(toDateTimeLocal(null)).toBe('')
  })
})