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import {compare, type ITimestampStruct, printTs} from '../../../json-crdt-patch/clock';
import type {Model} from '../../model';
import type {Printable} from 'tree-dump/lib/types';
import type {JsonNode, JsonNodeView} from '..';
/**
* Represents a `obj` JSON CRDT node, which is a Last-write-wins (LWW) object.
* It is a map of string keys to LWW registers. The value of each register is
* a reference to another JSON CRDT node.
*
* @category CRDT Node
*/
export class ObjNode<Value extends Record<string, JsonNode> = Record<string, JsonNode>>
implements JsonNode<JsonNodeView<Value>>, Printable
{
/**
* @ignore
*/
public readonly keys: Map<string, ITimestampStruct> = new Map();
constructor(
/**
* @ignore
*/
protected readonly doc: Model<any>,
public readonly id: ITimestampStruct,
) {}
/**
* Retrieves a JSON CRDT node at the given key.
*
* @param key A key of the object.
* @returns JSON CRDT node at the given key, if any.
*/
public get<K extends keyof Value>(key: K): undefined | Value[K] {
const id = this.keys.get(key as string);
if (!id) return undefined;
return this.doc.index.get(id) as Value[K];
}
/**
* Rewrites object key.
*
* @param key Object key to set.
* @param id ID of the contents of the key.
* @returns Returns old entry ID, if any.
* @ignore
*/
public put(key: string, id: ITimestampStruct): undefined | ITimestampStruct {
const currentId = this.keys.get(key);
if (currentId && compare(currentId, id) >= 0) return;
this.keys.set(key, id);
return currentId;
}
/**
* Iterate over all key-value pairs in the object.
*
* @param callback Callback to call for each key-value pair.
*/
public nodes(callback: (node: JsonNode, key: string) => void) {
const index = this.doc.index;
this.keys.forEach((id, key) => callback(index.get(id)!, key));
}
// ----------------------------------------------------------------- JsonNode
/**
* @ignore
*/
public children(callback: (node: JsonNode) => void) {
const index = this.doc.index;
this.keys.forEach((id, key) => callback(index.get(id)!));
}
/**
* @ignore
*/
public child() {
return undefined;
}
/**
* @ignore
*/
public container(): JsonNode | undefined {
return this;
}
/**
* @ignore
*/
private _tick: number = 0;
/**
* @ignore
*/
private _view = {} as JsonNodeView<Value>;
/**
* @ignore
*/
public view(): JsonNodeView<Value> {
const doc = this.doc;
const tick = doc.clock.time + doc.tick;
const _view = this._view;
if (this._tick === tick) return _view;
const view = {} as JsonNodeView<Value>;
const index = doc.index;
let useCache = true;
this.keys.forEach((id, key) => {
const valueNode = index.get(id);
if (!valueNode) {
useCache = false;
return;
}
const value = valueNode.view();
if (value !== undefined) {
if (_view[key] !== value) useCache = false;
(<any>view)[key] = value;
} else if (_view[key] !== undefined) useCache = false;
});
return useCache ? _view : ((this._tick = tick), (this._view = view));
}
/**
* @ignore
*/
public api: undefined | unknown = undefined;
public name(): string {
return 'obj';
}
// ---------------------------------------------------------------- Printable
public toString(tab: string = ''): string {
const header = this.name() + ' ' + printTs(this.id);
return (
header +
printTree(
tab,
[...this.keys.entries()]
.filter(([, id]) => !!this.doc.index.get(id))
.map(
([key, id]) =>
(tab) =>
JSON.stringify(key) + printTree(tab + ' ', [(tab) => this.doc.index.get(id)!.toString(tab)]),
),
)
);
}
}
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