import {validateDoc,type StudioDoc} from './document.ts';
export type SmartParent={tabId:string;linkedId:string;sourceKey?:string;sourceHash?:string};
export type HistorySnapshot={id:string;name:string;createdAt:number;doc:StudioDoc};
export type SavedTab={id:string;doc:StudioDoc;smartParent?:SmartParent;snapshots?:HistorySnapshot[]};
export type SavedWorkspace={version:1;activeId:string;tabs:SavedTab[];savedAt:number};
let queue:Promise<void>=Promise.resolve();
function database(){return new Promise<IDBDatabase>((resolve,reject)=>{const r=indexedDB.open('layer-studio',1);r.onupgradeneeded=()=>r.result.createObjectStore('documents');r.onsuccess=()=>resolve(r.result);r.onerror=()=>reject(r.error);});}
export function saveWorkspace(value:SavedWorkspace){const snapshot=value;const job=queue.catch(()=>{}).then(async()=>{const db=await database();try{await new Promise<void>((resolve,reject)=>{const t=db.transaction('documents','readwrite'),s=t.objectStore('documents'),r=s.get('workspace');r.onsuccess=()=>{if(r.result)s.put(r.result,'workspace-recovery');s.put(snapshot,'workspace');const current=snapshot.tabs.find(t=>t.id===snapshot.activeId);if(current)s.put(current.doc,'current');};t.oncomplete=()=>resolve();t.onabort=()=>reject(t.error??Error('Saving was cancelled.'));t.onerror=()=>reject(t.error);});}finally{db.close();}});queue=job;return job;}
export async function loadWorkspace(recovery=false):Promise<SavedWorkspace|null>{const db=await database();try{const v=await new Promise<SavedWorkspace|undefined>((resolve,reject)=>{const r=db.transaction('documents').objectStore('documents').get(recovery?'workspace-recovery':'workspace');r.onsuccess=()=>resolve(r.result);r.onerror=()=>reject(r.error);});if(!v)return null;if(v.version!==1||!Array.isArray(v.tabs)||v.tabs.length>20||!v.tabs.some(t=>t.id===v.activeId))throw Error('Invalid recovery workspace.');for(const t of v.tabs){validateDoc(t.doc);if(t.snapshots){if(!Array.isArray(t.snapshots)||t.snapshots.length>5)throw Error('Invalid history snapshots.');for(const s of t.snapshots){if(typeof s.id!=='string'||typeof s.name!=='string'||s.name.length>80||!Number.isFinite(s.createdAt))throw Error('Invalid history snapshot.');validateDoc(s.doc);}}}return v;}finally{db.close();}}