import {test} from 'node:test';
import assert from 'node:assert/strict';
import {freeze,validJson} from '../../src/lib/canvas-core/values.ts';
import {encodeRecoveryValue,sealRecoveryImage,isSealedRecoveryImage} from '../../src/lib/canvas-runtime/recovery-encoding.ts';
const json=value=>JSON.parse(JSON.stringify(value));

test('recovery encoding preserves JSON value semantics including omitted, sparse, special-key and custom values',()=>{
 const value={number:-0,infinite:Infinity,missing:undefined,symbol:Symbol('s'),fn(){},array:[,undefined,()=>{},Symbol('s'),NaN],date:new Date('2026-01-01T00:00:00Z'),boxed:new Number(4),custom:{toJSON(key){return{key,text:'custom'};}},['__proto__']:{safe:true}};
 const encoded=encodeRecoveryValue(value);assert.deepEqual(encoded,json(value));assert.equal(validJson(encoded),true);assert.equal(Object.getPrototypeOf(encoded),Object.prototype);assert.equal(Object.hasOwn(encoded,'__proto__'),true);assert.ok(Object.isFrozen(encoded.array));
});
test('only frozen data subtrees are reused and the encoded image is detached and immutable',()=>{
 const shared=freeze({items:[{title:'stable',unknown:{retained:true}}]}),left=encodeRecoveryValue({shared}),right=encodeRecoveryValue({shared});assert.equal(left.shared,right.shared);assert.notEqual(left.shared,shared);assert.throws(()=>{left.shared.items[0].title='changed';},TypeError);
 const mutable={title:'before'},shallow=Object.freeze({mutable});assert.equal(encodeRecoveryValue(shallow).mutable.title,'before');mutable.title='after';assert.equal(encodeRecoveryValue(shallow).mutable.title,'after');assert.equal(encodeRecoveryValue(shallow).mutable===mutable,false);
});
test('frozen getters, custom prototypes and internally mutable objects are evaluated again',()=>{
 let current='first';const getter=Object.freeze({get title(){return current;}});assert.equal(encodeRecoveryValue(getter).title,'first');current='second';assert.equal(encodeRecoveryValue(getter).title,'second');
 let enabled=false;const dynamic={value:'ordinary'};Object.defineProperty(dynamic,'toJSON',{get(){return enabled?()=>({changed:true}):undefined;}});Object.freeze(dynamic);assert.deepEqual(encodeRecoveryValue(dynamic),{value:'ordinary'});enabled=true;assert.deepEqual(encodeRecoveryValue(dynamic),{changed:true});
 const date=Object.freeze(new Date('2026-01-01Z'));const parent=Object.freeze({date});assert.deepEqual(encodeRecoveryValue(parent),json(parent));date.setUTCFullYear(2027);assert.deepEqual(encodeRecoveryValue(parent),json(parent));
 const prototype=Object.create(Array.prototype);prototype[0]='old';const array=new Array(1);Object.setPrototypeOf(array,prototype);Object.freeze(array);assert.deepEqual(encodeRecoveryValue(array),['old']);prototype[0]='new';assert.deepEqual(encodeRecoveryValue(array),['new']);
});
test('cached subtree height cannot bypass the depth bound and omitted object fields do not count',()=>{
 const nest=(count,leaf)=>{for(let i=0;i<count;i++)leaf=Object.freeze({child:leaf});return leaf;},leaf=freeze({value:1});encodeRecoveryValue(leaf);assert.equal(validJson(encodeRecoveryValue(nest(63,leaf))),true);assert.throws(()=>encodeRecoveryValue(nest(64,leaf)),/invalid_recovery_payload/);
 assert.equal(validJson(encodeRecoveryValue(nest(64,Object.freeze({optional:undefined})))),true);assert.throws(()=>encodeRecoveryValue(nest(64,Object.freeze([undefined]))),/invalid_recovery_payload/);
 const cycle={};cycle.self=cycle;assert.throws(()=>encodeRecoveryValue(cycle),/invalid_recovery_payload/);assert.throws(()=>encodeRecoveryValue({big:1n}));
});
test('only factory-owned images are recognized; immutable-looking impostors retain defensive-copy handling',()=>{
 const mutable={title:'before'},image=sealRecoveryImage(2,3,2,{mutable});assert.equal(isSealedRecoveryImage(image),true);assert.equal(isSealedRecoveryImage(structuredClone(image)),false);assert.equal(isSealedRecoveryImage(Object.freeze({...image})),false);mutable.title='after';assert.equal(image.payload.mutable.title,'before');assert.ok(Object.isFrozen(image.payload.mutable));assert.throws(()=>sealRecoveryImage(2,1,2,{}),/corrupt_recovery_image/);assert.equal(isSealedRecoveryImage(sealRecoveryImage(3,1,1,{})),true);assert.equal(isSealedRecoveryImage(sealRecoveryImage(4,1,1,{})),true);assert.equal(isSealedRecoveryImage(sealRecoveryImage(5,1,1,{})),true);assert.equal(isSealedRecoveryImage(sealRecoveryImage(6,1,1,{})),true);assert.equal(isSealedRecoveryImage(sealRecoveryImage(7,1,1,{})),true);assert.equal(isSealedRecoveryImage(sealRecoveryImage(8,1,1,{})),true);assert.equal(isSealedRecoveryImage(sealRecoveryImage(9,1,1,{})),true);assert.throws(()=>sealRecoveryImage(10,1,1,{}),/corrupt_recovery_image/);
});