import { describe, it, expect } from 'vitest'
import { createRef } from 'react'
import { tableConfig, tableDownloadConfig } from './config'

describe('tableConfig', () => {
  it('returns config with the provided columns', () => {
    const columns = [
      { id: 'name', label: 'Name' },
      { id: 'age', label: 'Age' },
    ] satisfies Parameters<typeof tableConfig>[0]
    const cfg = tableConfig(columns)
    expect(cfg.columns).toBe(columns)
    expect(cfg.mode).toBe('local')
    expect(cfg.selectable).toBe(false)
  })

  it('defaults to empty columns when no argument passed', () => {
    const cfg = tableConfig()
    expect(cfg.columns).toEqual([])
  })
})

describe('tableDownloadConfig', () => {
  const refUI = createRef<HTMLDivElement>()

  it('returns a two-item download config (PNG + CSV)', () => {
    const cfg = tableDownloadConfig({ refUI })
    expect(cfg).toHaveLength(2)
  })

  it('CSV modifier handles populated row data with mixed value types', async () => {
    const cfg = tableDownloadConfig({ refUI })
    const csvItem = cfg[1]!
    const rows = [
      { id: '1', name: 'A', value: 10, meta: { tag: 'x' } },
      { id: '2', name: 'B', value: null, meta: { tag: 'y' } },
      { id: '3', name: 'C', value: undefined, meta: undefined },
    ] as unknown as Parameters<NonNullable<typeof csvItem.modifier>>[0]
    await expect(csvItem.modifier(rows)).resolves.not.toThrow()
  })

  it('CSV modifier short-circuits when data is empty', async () => {
    const cfg = tableDownloadConfig({ refUI })
    const csvItem = cfg[1]!
    await expect(csvItem.modifier([])).resolves.not.toThrow()
    await expect(
      csvItem.modifier(
        undefined as unknown as Parameters<
          NonNullable<typeof csvItem.modifier>
        >[0],
      ),
    ).resolves.not.toThrow()
  })

  it('CSV modifier handles first-row being undefined (edge case)', async () => {
    const cfg = tableDownloadConfig({ refUI })
    const csvItem = cfg[1]!
    // Pass an array containing a falsy first item — should not throw.
    await expect(
      csvItem.modifier([undefined] as unknown as Parameters<
        NonNullable<typeof csvItem.modifier>
      >[0]),
    ).resolves.not.toThrow()
  })
})