"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
    if (k2 === undefined) k2 = k;
    o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
    if (mod && mod.__esModule) return mod;
    var result = {};
    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
    __setModuleDefault(result, mod);
    return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.zipWithNext = void 0;
// ets_tracing: off
const CK = __importStar(require("../../../../Collections/Immutable/Chunk"));
const Tp = __importStar(require("../../../../Collections/Immutable/Tuple"));
const O = __importStar(require("../../../../Option"));
const CH = __importStar(require("../../Channel"));
const C = __importStar(require("../core"));
/**
 * Zips each element with the next element if present.
 */
function zipWithNext(self) {
    const process = (last) => CH.readWith((in_) => {
        const { tuple: [newlast, chunk] } = CK.mapAccum_(in_, last, (prev, curr) => Tp.tuple(O.some(curr), O.map_(prev, (_) => Tp.tuple(_, curr))));
        const out = CK.filterMap_(chunk, O.fold(() => O.none, ({ tuple: [prev, curr] }) => O.some(Tp.tuple(prev, O.some(curr)))));
        return CH.zipRight_(CH.write(out), process(newlast));
    }, (err) => CH.fail(err), (_) => O.fold_(last, () => CH.unit, (value) => CH.zipRight_(CH.write(CK.single(Tp.tuple(value, O.none))), CH.unit)));
    return new C.Stream(self.channel[">>>"](process(O.none)));
}
exports.zipWithNext = zipWithNext;
//# sourceMappingURL=zipWithNext.js.map