import { describe, expect, it } from 'vitest'

import { providerDisplayNames } from '../domain/providers.js'

describe('providerDisplayNames', () => {
  it('returns bare names when all are unique', () => {
    expect(
      providerDisplayNames([
        { name: 'Anthropic', slug: 'anthropic' },
        { name: 'OpenAI', slug: 'openai' }
      ])
    ).toEqual(['Anthropic', 'OpenAI'])
  })

  it('appends slug to every collision so the disambiguation is symmetric', () => {
    expect(
      providerDisplayNames([
        { name: 'Kimi For Coding', slug: 'kimi-coding' },
        { name: 'Kimi For Coding', slug: 'kimi-coding-cn' }
      ])
    ).toEqual(['Kimi For Coding (kimi-coding)', 'Kimi For Coding (kimi-coding-cn)'])
  })

  it('only disambiguates the colliding group', () => {
    expect(
      providerDisplayNames([
        { name: 'Anthropic', slug: 'anthropic' },
        { name: 'Foo', slug: 'foo-a' },
        { name: 'Foo', slug: 'foo-b' }
      ])
    ).toEqual(['Anthropic', 'Foo (foo-a)', 'Foo (foo-b)'])
  })

  it('falls back to plain name if slug is empty', () => {
    expect(
      providerDisplayNames([
        { name: 'Foo', slug: '' },
        { name: 'Foo', slug: '' }
      ])
    ).toEqual(['Foo', 'Foo'])
  })

  it('skips disambiguation when slug equals name', () => {
    expect(
      providerDisplayNames([
        { name: 'foo', slug: 'foo' },
        { name: 'foo', slug: 'foo' }
      ])
    ).toEqual(['foo', 'foo'])
  })

  it('handles empty input', () => {
    expect(providerDisplayNames([])).toEqual([])
  })

  it('preserves order', () => {
    const input = [
      { name: 'Z', slug: 'z' },
      { name: 'A', slug: 'a1' },
      { name: 'A', slug: 'a2' }
    ]

    expect(providerDisplayNames(input)).toEqual(['Z', 'A (a1)', 'A (a2)'])
  })
})