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

import {
  CHALK_USES_RICH_EIGHT_BIT_DOWNGRADE,
  richEightBitColorNumber,
  shouldUseRichEightBitDowngradeForLegacyAppleTerminal
} from './colorize.js'

describe('shouldUseRichEightBitDowngradeForLegacyAppleTerminal', () => {
  it('memoizes the current process decision for render hot paths', () => {
    expect(typeof CHALK_USES_RICH_EIGHT_BIT_DOWNGRADE).toBe('boolean')
  })

  it('uses Rich-compatible 256-color downgrade on legacy Apple Terminal', () => {
    expect(
      shouldUseRichEightBitDowngradeForLegacyAppleTerminal({ TERM_PROGRAM: 'Apple_Terminal' } as NodeJS.ProcessEnv, 2)
    ).toBe(true)
  })

  it('normalizes Apple Terminal names before matching', () => {
    expect(
      shouldUseRichEightBitDowngradeForLegacyAppleTerminal({ TERM_PROGRAM: ' Apple_Terminal ' } as NodeJS.ProcessEnv, 2)
    ).toBe(true)
  })

  it('does not rewrite when Apple Terminal advertises truecolor', () => {
    expect(
      shouldUseRichEightBitDowngradeForLegacyAppleTerminal(
        { COLORTERM: 'truecolor', TERM_PROGRAM: 'Apple_Terminal' } as NodeJS.ProcessEnv,
        3
      )
    ).toBe(false)
  })

  it('does not override explicit color environment choices', () => {
    expect(
      shouldUseRichEightBitDowngradeForLegacyAppleTerminal(
        { FORCE_COLOR: '2', TERM_PROGRAM: 'Apple_Terminal' } as NodeJS.ProcessEnv,
        2
      )
    ).toBe(false)
    expect(
      shouldUseRichEightBitDowngradeForLegacyAppleTerminal(
        { HERMES_TUI_TRUECOLOR: '1', TERM_PROGRAM: 'Apple_Terminal' } as NodeJS.ProcessEnv,
        3
      )
    ).toBe(false)
  })
})

describe('richEightBitColorNumber', () => {
  it('matches Rich downgrade output for default Hermes skin colors', () => {
    expect(richEightBitColorNumber(0xff, 0xd7, 0x00)).toBe(220)
    expect(richEightBitColorNumber(0xff, 0xbf, 0x00)).toBe(214)
    expect(richEightBitColorNumber(0xcd, 0x7f, 0x32)).toBe(173)
    expect(richEightBitColorNumber(0xb8, 0x86, 0x0b)).toBe(136)
    expect(richEightBitColorNumber(0xff, 0xf8, 0xdc)).toBe(230)
  })
})