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import {cmpUint8Array} from '@jsonjoy.com/util/lib/buffers/cmpUint8Array';
import {type ITimespanStruct, type ITimestampStruct, type Patch, PatchBuilder} from '../json-crdt-patch';
import {ArrNode, BinNode, ConNode, ObjNode, StrNode, ValNode, VecNode, type JsonNode} from '../json-crdt/nodes';
import * as str from '../util/diff/str';
import * as bin from '../util/diff/bin';
import * as line from '../util/diff/line';
import {structHashCrdt} from '../json-hash/structHashCrdt';
import {structHash} from '../json-hash';
import type {Model} from '../json-crdt/model';
export class DiffError extends Error {
constructor(message: string = 'DIFF') {
super(message);
}
}
export class JsonCrdtDiff {
protected builder: PatchBuilder;
public constructor(protected readonly model: Model<any>) {
this.builder = new PatchBuilder(model.clock.clone());
}
protected diffStr(src: StrNode, dst: string): void {
const view = src.view();
if (view === dst) return;
const builder = this.builder;
str.apply(
str.diff(view, dst),
view.length,
(pos, txt) => builder.insStr(src.id, !pos ? src.id : src.find(pos - 1)!, txt),
(pos, len) => builder.del(src.id, src.findInterval(pos, len)),
);
}
protected diffBin(src: BinNode, dst: Uint8Array): void {
const view = src.view();
if (cmpUint8Array(view, dst)) return;
const builder = this.builder;
bin.apply(
bin.diff(view, dst),
view.length,
(pos, txt) => builder.insBin(src.id, !pos ? src.id : src.find(pos - 1)!, txt),
(pos, len) => builder.del(src.id, src.findInterval(pos, len)),
);
}
protected diffArr(src: ArrNode, dst: unknown[]): void {
const srcLines: string[] = [];
src.children((node) => {
srcLines.push(structHashCrdt(node));
});
const dstLines: string[] = [];
const dstLength = dst.length;
for (let i = 0; i < dstLength; i++) dstLines.push(structHash(dst[i]));
const linePatch = line.diff(srcLines, dstLines);
if (!linePatch.length) return;
const inserts: [after: ITimestampStruct, views: unknown[]][] = [];
const deletes: ITimespanStruct[] = [];
const patchLength = linePatch.length;
for (let i = patchLength - 1; i >= 0; i--) {
const [type, posSrc, posDst] = linePatch[i];
switch (type) {
case line.LINE_PATCH_OP_TYPE.EQL:
break;
case line.LINE_PATCH_OP_TYPE.INS: {
const view = dst[posDst];
const after = posSrc >= 0 ? src.find(posSrc) : src.id;
Iif (!after) throw new DiffError();
inserts.push([after, [view]]);
break;
}
case line.LINE_PATCH_OP_TYPE.DEL: {
const span = src.findInterval(posSrc, 1);
Iif (!span || !span.length) throw new DiffError();
deletes.push(...span);
break;
}
case line.LINE_PATCH_OP_TYPE.MIX: {
const view = dst[posDst];
try {
this.diffAny(src.getNode(posSrc)!, view);
} catch (error) {
if (error instanceof DiffError) {
const span = src.findInterval(posSrc, 1)!;
deletes.push(...span);
const after = posSrc ? src.find(posSrc - 1) : src.id;
Iif (!after) throw new DiffError();
inserts.push([after, [view]]);
} else Ethrow error;
}
}
}
}
const builder = this.builder;
const length = inserts.length;
for (let i = 0; i < length; i++) {
const [after, views] = inserts[i];
builder.insArr(
src.id,
after,
views.map((view) => builder.json(view)),
);
}
if (deletes.length) builder.del(src.id, deletes);
}
protected diffObj(src: ObjNode, dst: Record<string, unknown>): void {
const builder = this.builder;
const inserts: [key: string, value: ITimestampStruct][] = [];
const srcKeys = new Set<string>();
// biome-ignore lint: .forEach is fastest here
src.forEach((key) => {
srcKeys.add(key);
const dstValue = dst[key];
if (dstValue === void 0) inserts.push([key, builder.con(undefined)]);
});
const keys = Object.keys(dst);
const length = keys.length;
for (let i = 0; i < length; i++) {
const key = keys[i];
const dstValue = dst[key];
if (srcKeys.has(key)) {
const child = src.get(key);
if (child) {
try {
this.diffAny(child, dstValue);
continue;
} catch (error) {
Iif (!(error instanceof DiffError)) throw error;
}
}
}
inserts.push([key, src.get(key) instanceof ConNode ? builder.con(dstValue) : builder.constOrJson(dstValue)]);
}
if (inserts.length) builder.insObj(src.id, inserts);
}
protected diffVec(src: VecNode, dst: unknown[]): void {
const builder = this.builder;
const edits: [key: number, value: ITimestampStruct][] = [];
const elements = src.elements;
const srcLength = elements.length;
const dstLength = dst.length;
const index = src.doc.index;
const min = Math.min(srcLength, dstLength);
for (let i = dstLength; i < srcLength; i++) {
const id = elements[i];
if (id) {
const child = index.get(id);
const isDeleted = !child || (child instanceof ConNode && child.val === void 0);
if (isDeleted) return;
edits.push([i, builder.con(void 0)]);
}
}
for (let i = 0; i < min; i++) {
const value = dst[i];
const child = src.get(i);
if (child) {
try {
this.diffAny(child, value);
continue;
} catch (error) {
Iif (!(error instanceof DiffError)) throw error;
}
}
edits.push([i, builder.constOrJson(value)]);
}
for (let i = srcLength; i < dstLength; i++) edits.push([i, builder.constOrJson(dst[i])]);
if (edits.length) builder.insVec(src.id, edits);
}
protected diffVal(src: ValNode, dst: unknown): void {
try {
this.diffAny(src.node(), dst);
} catch (error) {
if (error instanceof DiffError) {
const builder = this.builder;
builder.setVal(src.id, builder.constOrJson(dst));
} else Ethrow error;
}
}
protected diffAny(src: JsonNode, dst: unknown): void {
if (src instanceof ConNode) {
const val = src.val;
if (val !== dst && !deepEqual(src.val, dst)) throw new DiffError();
} else if (src instanceof StrNode) {
if (typeof dst !== 'string') throw new DiffError();
this.diffStr(src, dst);
} else if (src instanceof ObjNode) {
Iif (!dst || typeof dst !== 'object' || Array.isArray(dst)) throw new DiffError();
this.diffObj(src, dst as Record<string, unknown>);
} else if (src instanceof ValNode) {
this.diffVal(src, dst);
} else if (src instanceof ArrNode) {
if (!Array.isArray(dst)) throw new DiffError();
this.diffArr(src, dst as unknown[]);
} else if (src instanceof VecNode) {
Iif (!Array.isArray(dst)) throw new DiffError();
this.diffVec(src, dst as unknown[]);
} else if (src instanceof BinNode) {
Iif (!(dst instanceof Uint8Array)) throw new DiffError();
this.diffBin(src, dst);
} else E{
throw new DiffError();
}
}
public diff(src: JsonNode, dst: unknown): Patch {
this.diffAny(src, dst);
return this.builder.flush();
}
}
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