import { restoreInput } from './contracts.mjs'
export const aspectOptions = [{id:'auto',label:'Automatic',hint:'Match start or hero still'},{id:'16:9',label:'16:9',hint:'1344 × 768 · padded'},{id:'9:16',label:'9:16',hint:'768 × 1344 · padded'},{id:'1:1',label:'1:1',hint:'960 × 960 · padded'}]
export function resolveSize(aspect, source, fallback = {width:1344,height:768}) {
  const presets = {'16:9':[1344,768],'9:16':[768,1344],'1:1':[960,960]}
  if (presets[aspect]) return {width:presets[aspect][0],height:presets[aspect][1]}
  if (!source?.width || !source?.height) return {width:fallback.width || 1344,height:fallback.height || 768}
  const factor = Math.min(1344/Math.max(source.width,source.height),768/Math.min(source.width,source.height))
  return {width:Math.max(256,Math.round(source.width*factor/32)*32),height:Math.max(256,Math.round(source.height*factor/32)*32)}
}
export function bindClip(form, clip, xaigen = false) {
  if (!clip?.id) return form
  const saved = clip.studio2 || clip.job || {}, settings = saved.settings || clip.settings || clip
  const next = {...form, startClipId:clip.id, settings:{...form.settings}}
  next.settings.aspect=['auto','16:9','9:16','1:1'].includes(settings.aspect)?settings.aspect:'auto'
  for (const key of ['duration','aspect','width','height','fps','loraStack','turbo','steps','cfg']) {
    if (settings[key] != null && key!=='aspect') next.settings[key] = structuredClone(settings[key])
  }
  next.engine = xaigen && (saved.engine || clip.engine)==='ltx' ? 'ltx' : 'minimax'
  if (saved.identityStillId) next.identityStillId = saved.identityStillId
  // Missing legacy metadata must not reset a user's current choice.
  for (const key of ['lockFace','lockOutfit']) if (typeof saved[key] === 'boolean') next[key] = saved[key]
  return next
}
export function restoreAsset(form, item) {
  if (item.kind==='clip' || item.studio2?.kind==='video') {
    const next=bindClip(form,item,form.engine==='ltx')
    const seed=item.studio2?.settings?.seed ?? item.settings?.seed ?? item.seed
    if (seed != null) next.settings.seed=seed
    next.settings.seedMode='random'
    return {...next,mode:'extend'}
  }
  const restored = restoreInput(item)
  const next = {...form,...restored,settings:{...form.settings,...restored.settings}}
  next.settings.seedMode='random'
  if (item.kind === 'clip' || item.studio2?.kind === 'video') return {...bindClip(next,item),mode:'extend'}
  next.imageAId=item.id
  next.startClipId=''
  next.settings.aspect=item.studio2?.settings?.aspect || item.settings?.aspect || 'auto'
  return next
}
export function extendSelected(form, clip, xaigen = false) {
  // Switching task on the already bound clip must preserve the user's overrides.
  const next=clip?.id && form.startClipId !== clip.id ? bindClip(form,clip,xaigen) : form
  return {...next,mode:'extend',engine:xaigen && next.engine==='ltx'?'ltx':'minimax'}
}
export function changeSource(form) {
  return form.mode==='extend' ? form : {...form,startClipId:'',settings:{...form.settings,aspect:'auto'}}
}

export function useAsHero(form, item) { return {...form,identityStillId:item.id} }
export function useAsSource(form, item) { return {...form,imageAId:item.id} }
export function restoreAll(form,item,xaigen=false) {
 const restored=restoreInput(item),next={...form,...restored,settings:{...form.settings,...restored.settings,seedMode:'random'}}
 if(item.kind==='clip') return {...bindClip(next,item,xaigen),mode:'extend'}
 next.mode=restored.mode==='iterate'?'edit':restored.mode || 'edit'
 next.imageAId=item.id
 next.startClipId=''
 return next
}