// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
import { Builder } from '../../builder/index';
/** @ignore */
export function builderThroughDOMStream(options) {
    return new BuilderTransform(options);
}
/** @ignore */
export class BuilderTransform {
    constructor(options) {
        // Access properties by string indexers to defeat closure compiler
        this._numChunks = 0;
        this._finished = false;
        this._bufferedSize = 0;
        const { ['readableStrategy']: readableStrategy, ['writableStrategy']: writableStrategy, ['queueingStrategy']: queueingStrategy = 'count', ...builderOptions } = options;
        this._controller = null;
        this._builder = Builder.new(builderOptions);
        this._getSize = queueingStrategy !== 'bytes' ? chunkLength : chunkByteLength;
        const { ['highWaterMark']: readableHighWaterMark = queueingStrategy === 'bytes' ? 2 ** 14 : 1000 } = { ...readableStrategy };
        const { ['highWaterMark']: writableHighWaterMark = queueingStrategy === 'bytes' ? 2 ** 14 : 1000 } = { ...writableStrategy };
        this['readable'] = new ReadableStream({
            ['cancel']: () => { this._builder.clear(); },
            ['pull']: (c) => { this._maybeFlush(this._builder, this._controller = c); },
            ['start']: (c) => { this._maybeFlush(this._builder, this._controller = c); },
        }, {
            'highWaterMark': readableHighWaterMark,
            'size': queueingStrategy !== 'bytes' ? chunkLength : chunkByteLength,
        });
        this['writable'] = new WritableStream({
            ['abort']: () => { this._builder.clear(); },
            ['write']: () => { this._maybeFlush(this._builder, this._controller); },
            ['close']: () => { this._maybeFlush(this._builder.finish(), this._controller); },
        }, {
            'highWaterMark': writableHighWaterMark,
            'size': (value) => this._writeValueAndReturnChunkSize(value),
        });
    }
    _writeValueAndReturnChunkSize(value) {
        const bufferedSize = this._bufferedSize;
        this._bufferedSize = this._getSize(this._builder.append(value));
        return this._bufferedSize - bufferedSize;
    }
    _maybeFlush(builder, controller) {
        if (controller === null) {
            return;
        }
        if (this._bufferedSize >= controller.desiredSize) {
            ++this._numChunks && this._enqueue(controller, builder.toVector());
        }
        if (builder.finished) {
            if (builder.length > 0 || this._numChunks === 0) {
                ++this._numChunks && this._enqueue(controller, builder.toVector());
            }
            if (!this._finished && (this._finished = true)) {
                this._enqueue(controller, null);
            }
        }
    }
    _enqueue(controller, chunk) {
        this._bufferedSize = 0;
        this._controller = null;
        chunk === null ? controller.close() : controller.enqueue(chunk);
    }
}
/** @ignore */ const chunkLength = (chunk) => chunk.length;
/** @ignore */ const chunkByteLength = (chunk) => chunk.byteLength;

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