import { describe, it, expect, beforeEach, vi } from 'vitest'
import { buildTree, sortTree } from '@/utils/tree'

describe('utils/tree buildTree', () => {
  it('空数组返回空树', () => {
    expect(buildTree([])).toEqual([])
  })

  it('无父节点的节点成为根', () => {
    const list = [
      { b_id: 1, b_parent_id: null },
      { b_id: 2, b_parent_id: null },
    ]
    const tree = buildTree(list)
    expect(tree).toHaveLength(2)
    expect(tree.map((n) => n.b_id)).toEqual([1, 2])
  })

  it('按 parentKey 挂载子节点', () => {
    const list = [
      { b_id: 1, b_parent_id: null },
      { b_id: 2, b_parent_id: 1 },
      { b_id: 3, b_parent_id: 2 },
    ]
    const tree = buildTree(list)
    expect(tree).toHaveLength(1)
    expect(tree[0].b_id).toBe(1)
    expect(tree[0].children).toHaveLength(1)
    expect(tree[0].children[0].b_id).toBe(2)
    expect(tree[0].children[0].children[0].b_id).toBe(3)
  })

  it('父节点不存在的子节点提升为根（孤儿节点）', () => {
    const list = [
      { b_id: 2, b_parent_id: 999 },
      { b_id: 3, b_parent_id: null },
    ]
    const tree = buildTree(list)
    expect(tree).toHaveLength(2)
  })

  it('支持自定义 idKey / parentKey / childrenKey', () => {
    const list = [
      { id: 'a', pid: null },
      { id: 'b', pid: 'a' },
    ]
    const tree = buildTree(list, 'id', 'pid', 'kids')
    expect(tree[0].kids[0].id).toBe('b')
  })

  it('副作用说明：向父节点对象注入 children 属性（当前实现行为）', () => {
    const list = [
      { b_id: 1, b_parent_id: null },
      { b_id: 2, b_parent_id: 1 },
    ]
    buildTree(list)
    // 当前实现直接修改传入的节点对象（parent[childrenKey] = []），
    // 调用方若复用原数组需注意此副作用；若要求纯函数需后续改造
    expect(Array.isArray(list[0].children)).toBe(true)
    expect(list[0].children).toHaveLength(1)
  })
})

describe('utils/tree sortTree', () => {
  it('按 b_xh 升序排序', () => {
    const tree = [{ b_xh: 3 }, { b_xh: 1 }, { b_xh: 2 }]
    sortTree(tree)
    expect(tree.map((n) => n.b_xh)).toEqual([1, 2, 3])
  })

  it('b_xh 相同按 b_id 排序', () => {
    const tree = [{ b_xh: 1, b_id: 'b' }, { b_xh: 1, b_id: 'a' }]
    sortTree(tree)
    expect(tree.map((n) => n.b_id)).toEqual(['a', 'b'])
  })

  it('递归排序子节点', () => {
    const tree = [
      {
        b_xh: 1,
        children: [{ b_xh: 2 }, { b_xh: 1 }],
      },
    ]
    sortTree(tree)
    expect(tree[0].children.map((n) => n.b_xh)).toEqual([1, 2])
  })

  it('返回原数组引用', () => {
    const tree = [{ b_xh: 2 }, { b_xh: 1 }]
    expect(sortTree(tree)).toBe(tree)
  })
})

describe('utils/theme', () => {
  beforeEach(() => {
    document.documentElement.style.cssText = ''
    document.documentElement.classList.remove('dark')
  })

  it('applyPrimaryColor 写入 --fms-primary CSS 变量', async () => {
    const { applyPrimaryColor } = await import('@/theme/index')
    applyPrimaryColor('#ff0000')
    expect(document.documentElement.style.getPropertyValue('--fms-primary')).toBe('#ff0000')
  })

  it('applyPrimaryColor 空值不写入', async () => {
    const { applyPrimaryColor } = await import('@/theme/index')
    applyPrimaryColor('')
    expect(document.documentElement.style.getPropertyValue('--fms-primary')).toBe('')
  })

  it('applyDarkMode true 添加 dark class，false 移除', async () => {
    const { applyDarkMode } = await import('@/theme/index')
    applyDarkMode(true)
    expect(document.documentElement.classList.contains('dark')).toBe(true)
    applyDarkMode(false)
    expect(document.documentElement.classList.contains('dark')).toBe(false)
  })
})