import {parameters,LayoutParameterError,type Layout,type Parameters,type TextValue,uuid} from './layout-parameters';
export type Typography=Required<Pick<TextValue,'fontFamily'|'fontSize'|'fontWeight'|'lineHeight'|'letterSpacing'>>;
export type Series={version:1;brief:{topic:string;audience:string;intent:string;designIntent:string;imageStrategy:string};style:{version:string;palette:{paper:string;ink:string;muted:string;accent:string};typography:Record<'title'|'body'|'caption',Typography>;spacing:{margin:number;gap:number}};sources:{assetId:string;author:string;license:string;url:string;prompt:string;tool:string}[];pages:{key:string;role:'cover'|'body'|'ending';layoutId:string;intent:string;bindings:Record<string,'title'|'body'|'caption'>;parameters:Parameters}[]};
function fail(message:string):never{throw new LayoutParameterError(message)}
const obj=(v:unknown)=>{if(!v||typeof v!=='object'||Array.isArray(v))return fail('作品字段必须是对象');return v as Record<string,unknown>};
function exact(v:unknown,allowed:string[]){const o=obj(v);if(Object.keys(o).some(k=>!allowed.includes(k)))fail('作品包含未知字段');return o}
function str(v:unknown,max=1000){if(typeof v!=='string'||!v.trim()||v.length>max)fail('作品文字缺失或超长');return v as string}
function num(v:unknown,min:number,max:number){if(typeof v!=='number'||!Number.isFinite(v)||v<min||v>max)fail('作品数值超出范围');return v as number}
/** Closed, bounded content document. The same validator runs in persistence and SSR. */
export function series(input:unknown,layouts:Layout[]):Series{
 const raw=exact(input,['version','brief','style','sources','pages']);if(raw.version!==1)fail('不支持的作品版本');
 const brief=exact(raw.brief,['topic','audience','intent','designIntent','imageStrategy']);for(const k of ['topic','audience','intent','designIntent','imageStrategy'])str(brief[k],2000);
 const style=exact(raw.style,['version','palette','typography','spacing']);str(style.version,80);
 const palette=exact(style.palette,['paper','ink','muted','accent']);for(const k of ['paper','ink','muted','accent'])if(!/^#[a-f\d]{6}$/i.test(String(palette[k])))fail('作品颜色使用 #RRGGBB');
 const typography=exact(style.typography,['title','body','caption']);
 for(const role of ['title','body','caption']){const t=exact(typography[role],['fontFamily','fontSize','fontWeight','lineHeight','letterSpacing']);if(!['sans','serif','mono'].includes(String(t.fontFamily)))fail('无效作品字体');num(t.fontSize,.1,40);num(t.fontWeight,100,900);num(t.lineHeight,.5,4);num(t.letterSpacing,-5,10)}
 const spacing=exact(style.spacing,['margin','gap']);num(spacing.margin,4,16);num(spacing.gap,1,10);if(Number(spacing.margin)*2+Number(spacing.gap)*4>48)fail('页边距与间距组合过大');
 if(!Array.isArray(raw.sources)||raw.sources.length>100)fail('素材来源最多100条');
 const sources=raw.sources.map(v=>{const s=exact(v,['assetId','author','license','url','prompt','tool']);if(!uuid(str(s.assetId,36)))fail('来源需素材 UUID');for(const k of ['author','license','url','prompt','tool'])str(s[k],4000);if(s.url!=='generated'&&!/^https?:\/\//.test(String(s.url)))fail('来源使用 http(s) 地址或 generated');return s as Series['sources'][number]});
 if(!Array.isArray(raw.pages)||raw.pages.length<3||raw.pages.length>18)fail('作品需要3–18页');
 const seen=new Set<string>();
 const pages=raw.pages.map((entry,index)=>{const p=exact(entry,['key','role','layoutId','intent','bindings','parameters']);const key=str(p.key,60);if(!/^[a-z0-9-]+$/.test(key)||seen.has(key))fail('页面 key 必须唯一');seen.add(key);
 const role=index===0?'cover':index===(raw.pages as unknown[]).length-1?'ending':'body';if(p.role!==role)fail('页序须为封面、正文、结尾');str(p.intent,1000);const layout=layouts.find(l=>l.id===p.layoutId);if(!layout)fail('作品模板不存在');const resolvedLayout=layout!;const params=parameters(resolvedLayout,p.parameters);const bindings=obj(p.bindings);const slots=[...resolvedLayout.elements,...(params.added||[])];for(const [id,token] of Object.entries(bindings)){if(!slots.some(s=>s.id===id&&s.kind==='text')||!['title','body','caption'].includes(String(token)))fail('字体绑定无效');if(!params.texts[id])fail('绑定文字必须提供文案')}
 // Every visible text is authored; template placeholder copy must never leak into a finished series.
 for(const s of slots)if(s.kind==='text'&&!params.layers?.[s.id]?.hidden&&!params.texts[s.id])fail('请填写或隐藏所有文字元素');
 for(const image of Object.values(params.images))if(image.assetId&&!sources.some(s=>s.assetId===image.assetId))fail('每张图片需记录作者、许可和生成过程');
 return {...p,parameters:params,bindings} as Series['pages'][number]});
 return {version:1,brief:brief as Series['brief'],style:style as Series['style'],sources,pages};
}
/** Style units use a 120-wide reference canvas; explicit element values always win. */
export function pageParameters(doc:Series,page:Series['pages'][number],layout:Layout):Parameters{
 const p=page.parameters,s=doc.style,k=layout.width/120;
 const result:Parameters={...p,paper:p.paper||s.palette.paper,texts:{...p.texts},images:{...p.images},decorations:{...p.decorations},layers:{...p.layers}};
 for(const [id,token] of Object.entries(page.bindings)){const t=s.typography[token];result.texts[id]={...t,fontSize:t.fontSize*k,letterSpacing:t.letterSpacing*k,color:token==='caption'?s.palette.muted:s.palette.ink,...p.texts[id]}}
 for(const slot of [...layout.elements,...(p.added||[])]){if(slot.kind==='image')result.images[slot.id]={color:s.palette.accent,...p.images[slot.id]};if(slot.kind==='decoration')result.decorations[slot.id]={color:s.palette.accent,...p.decorations[slot.id]}}
 if(layout.id==='standard-01'){
  const m=s.spacing.margin,g=s.spacing.gap,w=120-2*m;
  const boxes:Record<string,number[]>={T03:[m,m,w,4],T01:[m,m+4+g,w,28],I01:[m,m+32+2*g,w,50],T02:[m,m+82+3*g,w,27],D01:[m,160-m,w,.4]};
  for(const [id,[x,y,width,height]] of Object.entries(boxes))result.layers![id]={x,y,width,height,...p.layers?.[id]};
 }
 return result;
}