import { describe, it, expect } from 'vitest'
import { parseTodoContent, generateTodoContent } from '../parser.js'
import type { DayTodo } from '../types.js'

describe('parseTodoContent', () => {
  it('should parse basic todo content correctly', () => {
    const content = `## 2024-01-01
- √ 完成工作
- ○ 购物`

    const result = parseTodoContent(content)

    expect(result).toHaveLength(1)
    expect(result[0].date).toBe('2024-01-01')
    expect(result[0].items).toHaveLength(2)
    expect(result[0].items[0].content).toBe('完成工作')
    expect(result[0].items[1].content).toBe('购物')
  })

  it('should correctly identify completed status with √', () => {
    const content = `## 2024-01-01
- √ 已完成任务`

    const result = parseTodoContent(content)

    expect(result[0].items[0].completed).toBe(true)
  })

  it('should correctly identify incomplete status with ○', () => {
    const content = `## 2024-01-01
- ○ 未完成任务`

    const result = parseTodoContent(content)

    expect(result[0].items[0].completed).toBe(false)
  })

  it('should parse multiple days correctly', () => {
    const content = `## 2024-01-01
- √ 第一天任务

## 2024-01-02
- ○ 第二天任务

## 2024-01-03
- √ 第三天任务`

    const result = parseTodoContent(content)

    expect(result).toHaveLength(3)
    expect(result[0].date).toBe('2024-01-01')
    expect(result[1].date).toBe('2024-01-02')
    expect(result[2].date).toBe('2024-01-03')
    expect(result[0].items[0].content).toBe('第一天任务')
    expect(result[1].items[0].content).toBe('第二天任务')
    expect(result[2].items[0].content).toBe('第三天任务')
  })

  it('should handle empty content', () => {
    const content = ''

    const result = parseTodoContent(content)

    expect(result).toHaveLength(0)
  })

  it('should ignore invalid format lines', () => {
    const content = `## 2024-01-01
这是一行普通文本
- 无效格式
- x 错误的标记
random line
- √ 有效的任务`

    const result = parseTodoContent(content)

    expect(result).toHaveLength(1)
    expect(result[0].items).toHaveLength(1)
    expect(result[0].items[0].content).toBe('有效的任务')
  })

  it('should generate unique IDs for items', () => {
    const content = `## 2024-01-01
- √ 任务一
- ○ 任务二
- √ 任务三`

    const result = parseTodoContent(content)

    expect(result[0].items[0].id).toBe('2024-01-01-0')
    expect(result[0].items[1].id).toBe('2024-01-01-1')
    expect(result[0].items[2].id).toBe('2024-01-01-2')
  })
})

describe('generateTodoContent', () => {
  it('should generate basic todo content correctly', () => {
    const dayTodos: DayTodo[] = [
      {
        date: '2024-01-01',
        items: [
          { id: '2024-01-01-0', content: '完成工作', completed: true },
          { id: '2024-01-01-1', content: '购物', completed: false }
        ]
      }
    ]

    const result = generateTodoContent(dayTodos)

    expect(result).toBe(`## 2024-01-01
- √ 完成工作
- ○ 购物`)
  })

  it('should include completed status in generated content', () => {
    const dayTodos: DayTodo[] = [
      {
        date: '2024-01-01',
        items: [
          { id: '2024-01-01-0', content: '已完成', completed: true },
          { id: '2024-01-01-1', content: '未完成', completed: false }
        ]
      }
    ]

    const result = generateTodoContent(dayTodos)

    expect(result).toContain('√ 已完成')
    expect(result).toContain('○ 未完成')
  })

  it('should sort dates in ascending order', () => {
    const dayTodos: DayTodo[] = [
      { date: '2024-01-03', items: [{ id: '1', content: '第三天', completed: false }] },
      { date: '2024-01-01', items: [{ id: '2', content: '第一天', completed: false }] },
      { date: '2024-01-02', items: [{ id: '3', content: '第二天', completed: false }] }
    ]

    const result = generateTodoContent(dayTodos)

    const firstDateIndex = result.indexOf('2024-01-01')
    const secondDateIndex = result.indexOf('2024-01-02')
    const thirdDateIndex = result.indexOf('2024-01-03')

    expect(firstDateIndex).toBeLessThan(secondDateIndex)
    expect(secondDateIndex).toBeLessThan(thirdDateIndex)
  })

  it('should handle empty array', () => {
    const dayTodos: DayTodo[] = []

    const result = generateTodoContent(dayTodos)

    expect(result).toBe('')
  })

  it('should generate content for multiple days with sorting', () => {
    const dayTodos: DayTodo[] = [
      { date: '2024-01-02', items: [{ id: '1', content: '第二天', completed: true }] },
      { date: '2024-01-01', items: [{ id: '2', content: '第一天', completed: false }] }
    ]

    const result = generateTodoContent(dayTodos)

    expect(result).toBe(`## 2024-01-01
- ○ 第一天

## 2024-01-02
- √ 第二天`)
  })
})