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import {type ITimespanStruct, type ITimestampStruct, Timestamp} from '../../clock';
import type {Patch} from '../../Patch';
import {JsonCrdtPatchOpcode, SESSION} from '../../constants';
import {toBase64} from '@jsonjoy.com/base64/lib/toBase64';
import type * as types from './types';
const timestamp = (sid: number, ts: ITimestampStruct): types.CompactCodecTimestamp => {
const tsSessionId = ts.sid;
return tsSessionId === sid ? ts.time : [tsSessionId, ts.time];
};
const timespan = (sid: number, span: ITimespanStruct): types.CompactCodecTimespan => {
const ts = timestamp(sid, span);
if (ts instanceof Array) {
ts.push(span.span);
return ts;
}
return [ts, span.span];
};
/**
* Encodes a patch into a compact binary format into a JavaScript array.
*
* @param patch The patch to encode.
* @returns The encoded patch as a JavaScript POJO.
*/
export const encode = (patch: Patch): types.CompactCodecPatch => {
const id = patch.getId();
Iif (!id) throw new Error('PATCH_EMPTY');
const sid = id.sid;
const time = id.time;
const header: types.CompactCodecPatch[0] = sid === SESSION.SERVER ? [time] : [[sid, time]];
const meta = patch.meta;
if (meta !== undefined) header.push(meta);
const res: types.CompactCodecPatch = [header];
for (const op of patch.ops) {
if (op instanceof operations.NewConOp) {
const val = op.val;
if (val instanceof Timestamp) {
res.push([JsonCrdtPatchOpcode.new_con, timestamp(sid, val), true]);
} else if (val === undefined) {
res.push([JsonCrdtPatchOpcode.new_con]);
} else {
res.push([JsonCrdtPatchOpcode.new_con, val]);
}
} else if (op instanceof operations.NewValOp) {
res.push([JsonCrdtPatchOpcode.new_val]);
} else if (op instanceof operations.NewObjOp) {
res.push([JsonCrdtPatchOpcode.new_obj]);
} else if (op instanceof operations.NewVecOp) {
res.push([JsonCrdtPatchOpcode.new_vec]);
} else if (op instanceof operations.NewStrOp) {
res.push([JsonCrdtPatchOpcode.new_str]);
} else if (op instanceof operations.NewBinOp) {
res.push([JsonCrdtPatchOpcode.new_bin]);
} else if (op instanceof operations.NewArrOp) {
res.push([JsonCrdtPatchOpcode.new_arr]);
} else if (op instanceof operations.InsValOp) {
res.push([JsonCrdtPatchOpcode.ins_val, timestamp(sid, op.obj), timestamp(sid, op.val)]);
} else if (op instanceof operations.InsObjOp) {
const tuples: types.CompactCodecInsObjOperation[2] = [];
for (const [key, value] of op.data) tuples.push([key, timestamp(sid, value)]);
const operation: types.CompactCodecInsObjOperation = [
JsonCrdtPatchOpcode.ins_obj,
timestamp(sid, op.obj),
tuples,
];
res.push(operation);
} else if (op instanceof operations.InsVecOp) {
const tuples: types.CompactCodecInsVecOperation[2] = [];
for (const [key, value] of op.data) tuples.push([key, timestamp(sid, value)]);
const operation: types.CompactCodecInsVecOperation = [
JsonCrdtPatchOpcode.ins_vec,
timestamp(sid, op.obj),
tuples,
];
res.push(operation);
} else if (op instanceof operations.InsStrOp) {
const operation: types.CompactCodecInsStrOperation = [
JsonCrdtPatchOpcode.ins_str,
timestamp(sid, op.obj),
timestamp(sid, op.ref),
op.data,
];
res.push(operation);
} else if (op instanceof operations.InsBinOp) {
const operation: types.CompactCodecInsBinOperation = [
JsonCrdtPatchOpcode.ins_bin,
timestamp(sid, op.obj),
timestamp(sid, op.ref),
toBase64(op.data),
];
res.push(operation);
} else if (op instanceof operations.InsArrOp) {
const elements: types.CompactCodecInsArrOperation[3] = [];
for (const element of op.data) elements.push(timestamp(sid, element));
const operation: types.CompactCodecInsArrOperation = [
JsonCrdtPatchOpcode.ins_arr,
timestamp(sid, op.obj),
timestamp(sid, op.ref),
elements,
];
res.push(operation);
} else if (op instanceof operations.DelOp) {
const operation: types.CompactCodecDelOperation = [
JsonCrdtPatchOpcode.del,
timestamp(sid, op.obj),
op.what.map((span) => timespan(sid, span)),
];
res.push(operation);
} else if (op instanceof operations.NopOp) {
const operation: types.CompactCodecNopOperation = [JsonCrdtPatchOpcode.nop];
const len = op.len;
if (len > 1) operation.push(len);
res.push(operation);
}
}
return res;
};
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