export const IMAGE_V2_MODES = ['edit', 'compose'] as const
export const IMAGE_V2_TASKS = ['scene', 'identity', 'outfit', 'face_lock'] as const

export type ImageV2Mode = (typeof IMAGE_V2_MODES)[number]
export type ImageV2Task = (typeof IMAGE_V2_TASKS)[number]

export const IMAGE_V2_STEPS_DEFAULT = 24
export const IMAGE_V2_CFG_DEFAULT = 4
export const IMAGE_V2_TURBO_STEPS = 8
export const IMAGE_V2_TURBO_CFG = 1
export const IMAGE_V2_SNOFS_MODEL = 0.65
export const IMAGE_V2_SNOFS_CLIP = 0.35
export const IMAGE_V2_CONSISTENCY_MODEL = 0.7
export const IMAGE_V2_CONSISTENCY_CLIP = 0.7
export const IMAGE_V2_STRENGTH_MIN = 0
export const IMAGE_V2_STRENGTH_MAX = 2
export const IMAGE_V2_STRENGTH_STEP = 0.05

export const IMAGE_V2_SNOFS_LORA = 'klein_snofs_v1_4.safetensors'
export const IMAGE_V2_CONSISTENCY_LORA = 'Flux2-Klein-9B-consistency-V2.safetensors'

export const IMAGE_V2_ROLE_HEADERS: Record<Exclude<ImageV2Task, 'scene'>, string> = {
  outfit: 'Person, face, body, pose, and background from image 1. Clothing only from image 2. Fit the outfit from image 2 to the body in image 1. Do not copy image 2’s face, body shape, or pose.',
  face_lock: 'Body, pose, and scene from image 1. Exact face from image 2.',
  identity: 'Same person as image 1. Use image 2 only to reinforce the face. Follow the user’s pose/scene prompt.'
}

export function parseImageV2Mode(raw: unknown): ImageV2Mode | null {
  const value = String(raw || '').trim().toLowerCase()
  return IMAGE_V2_MODES.includes(value as ImageV2Mode) ? value as ImageV2Mode : null
}

export function parseImageV2Task(raw: unknown, fallback: ImageV2Task = 'scene'): ImageV2Task {
  const value = String(raw || '').trim().toLowerCase()
  return IMAGE_V2_TASKS.includes(value as ImageV2Task) ? value as ImageV2Task : fallback
}

export function clampImageV2Strength(raw: unknown, fallback: number) {
  const value = Number(raw)
  if (!Number.isFinite(value)) return fallback
  const snapped = Math.round(value / IMAGE_V2_STRENGTH_STEP) * IMAGE_V2_STRENGTH_STEP
  return Math.min(IMAGE_V2_STRENGTH_MAX, Math.max(IMAGE_V2_STRENGTH_MIN, Math.round(snapped * 100) / 100))
}

export function composeImageV2Prompt(mode: ImageV2Mode, task: ImageV2Task, prompt: string) {
  const body = String(prompt || '').trim()
  if (mode !== 'compose' || task === 'scene') return body
  const header = IMAGE_V2_ROLE_HEADERS[task]
  return header ? `${header}\n\n${body}` : body
}

export type ImageV2PresetSettings = {
  mode?: ImageV2Mode
  task?: ImageV2Task
  negative?: string
  snofsModel?: number
  snofsClip?: number
  consistencyModel?: number
  consistencyClip?: number
  steps?: number
  cfg?: number
  megapixels?: number
  turbo?: boolean
}