import {
  adjustColor,
  parseToRgb,
  rgbToHex,
  toHexFromFormat
} from '@/utils/colorUtil'

export const DEFAULT_CUSTOM_NODE_COLOR = '#353535'

export const NODE_COLOR_FAVORITES_SETTING_ID = 'Comfy.NodeColor.Favorites'
export const NODE_COLOR_RECENTS_SETTING_ID = 'Comfy.NodeColor.Recents'
export const NODE_COLOR_DARKER_HEADER_SETTING_ID =
  'Comfy.NodeColor.DarkerHeader'

export const NODE_COLOR_SWATCH_LIMIT = 8

export function getDefaultCustomNodeColor(): string {
  return rgbToHex(parseToRgb(DEFAULT_CUSTOM_NODE_COLOR)).toLowerCase()
}

export function normalizeNodeColor(color: string | null | undefined): string {
  if (!color) return getDefaultCustomNodeColor()
  return toHexFromFormat(color, 'hex').toLowerCase()
}

export function deriveCustomNodeHeaderColor(
  backgroundColor: string,
  darkerHeader: boolean
): string {
  const normalized = normalizeNodeColor(backgroundColor)
  if (!darkerHeader) return normalized

  return rgbToHex(
    parseToRgb(adjustColor(normalized, { lightness: -0.18 }))
  ).toLowerCase()
}

export function upsertRecentNodeColor(
  colors: string[],
  color: string,
  limit: number = NODE_COLOR_SWATCH_LIMIT
): string[] {
  const normalized = normalizeNodeColor(color)
  return [normalized, ...colors.filter((value) => value !== normalized)].slice(
    0,
    limit
  )
}

export function toggleFavoriteNodeColor(
  colors: string[],
  color: string,
  limit: number = NODE_COLOR_SWATCH_LIMIT
): string[] {
  const normalized = normalizeNodeColor(color)
  if (colors.includes(normalized)) {
    return colors.filter((value) => value !== normalized)
  }

  return [...colors, normalized].slice(-limit)
}

export async function pickHexColor(
  initialColor?: string
): Promise<string | null> {
  if (typeof document === 'undefined') return null

  return await new Promise<string | null>((resolve) => {
    const input = document.createElement('input')
    input.type = 'color'
    input.value = normalizeNodeColor(initialColor)
    input.tabIndex = -1
    input.style.position = 'fixed'
    input.style.pointerEvents = 'none'
    input.style.opacity = '0'
    input.style.inset = '0'

    let settled = false

    const finish = (value: string | null) => {
      if (settled) return
      settled = true
      input.remove()
      resolve(value)
    }

    input.addEventListener(
      'change',
      () => {
        finish(normalizeNodeColor(input.value))
      },
      { once: true }
    )

    input.addEventListener(
      'blur',
      () => {
        queueMicrotask(() => finish(null))
      },
      { once: true }
    )

    document.body.append(input)
    input.click()
  })
}