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import { Observable, ObservableInput } from '../Observable';
import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { subscribeToResult } from '../util/subscribeToResult';
import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
import { OperatorFunction } from '../interfaces';
/* tslint:disable:max-line-length */
export function mergeMap<T, R>(project: (value: T, index: number) => ObservableInput<R>, concurrent?: number): OperatorFunction<T, R>;
export function mergeMap<T, I, R>(project: (value: T, index: number) => ObservableInput<I>, resultSelector: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R, concurrent?: number): OperatorFunction<T, R>;
/* tslint:enable:max-line-length */
/**
* Projects each source value to an Observable which is merged in the output
* Observable.
*
* <span class="informal">Maps each value to an Observable, then flattens all of
* these inner Observables using {@link mergeAll}.</span>
*
* <img src="./img/mergeMap.png" width="100%">
*
* Returns an Observable that emits items based on applying a function that you
* supply to each item emitted by the source Observable, where that function
* returns an Observable, and then merging those resulting Observables and
* emitting the results of this merger.
*
* @example <caption>Map and flatten each letter to an Observable ticking every 1 second</caption>
* var letters = Rx.Observable.of('a', 'b', 'c');
* var result = letters.mergeMap(x =>
* Rx.Observable.interval(1000).map(i => x+i)
* );
* result.subscribe(x => console.log(x));
*
* // Results in the following:
* // a0
* // b0
* // c0
* // a1
* // b1
* // c1
* // continues to list a,b,c with respective ascending integers
*
* @see {@link concatMap}
* @see {@link exhaustMap}
* @see {@link merge}
* @see {@link mergeAll}
* @see {@link mergeMapTo}
* @see {@link mergeScan}
* @see {@link switchMap}
*
* @param {function(value: T, ?index: number): ObservableInput} project A function
* that, when applied to an item emitted by the source Observable, returns an
* Observable.
* @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
* A function to produce the value on the output Observable based on the values
* and the indices of the source (outer) emission and the inner Observable
* emission. The arguments passed to this function are:
* - `outerValue`: the value that came from the source
* - `innerValue`: the value that came from the projected Observable
* - `outerIndex`: the "index" of the value that came from the source
* - `innerIndex`: the "index" of the value from the projected Observable
* @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
* Observables being subscribed to concurrently.
* @return {Observable} An Observable that emits the result of applying the
* projection function (and the optional `resultSelector`) to each item emitted
* by the source Observable and merging the results of the Observables obtained
* from this transformation.
* @method mergeMap
* @owner Observable
*/
export function mergeMap<T, I, R>(project: (value: T, index: number) => ObservableInput<I>,
resultSelector?: ((outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R) | number,
concurrent: number = Number.POSITIVE_INFINITY): OperatorFunction<T, I|R> {
return function mergeMapOperatorFunction(source: Observable<T>) {
if (typeof resultSelector === 'number') {
concurrent = <number>resultSelector;
resultSelector = null;
}
return source.lift(new MergeMapOperator(project, <any>resultSelector, concurrent));
};
}
export class MergeMapOperator<T, I, R> implements Operator<T, I> {
constructor(private project: (value: T, index: number) => ObservableInput<I>,
private resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R,
private concurrent: number = Number.POSITIVE_INFINITY) {
}
call(observer: Subscriber<I>, source: any): any {
return source.subscribe(new MergeMapSubscriber(
observer, this.project, this.resultSelector, this.concurrent
));
}
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
export class MergeMapSubscriber<T, I, R> extends OuterSubscriber<T, I> {
private hasCompleted: boolean = false;
private buffer: T[] = [];
private active: number = 0;
protected index: number = 0;
constructor(destination: Subscriber<I>,
private project: (value: T, index: number) => ObservableInput<I>,
private resultSelector?: (outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) => R,
private concurrent: number = Number.POSITIVE_INFINITY) {
super(destination);
}
protected _next(value: T): void {
if (this.active < this.concurrent) {
this._tryNext(value);
} else {
this.buffer.push(value);
}
}
protected _tryNext(value: T) {
let result: ObservableInput<I>;
const index = this.index++;
try {
result = this.project(value, index);
} catch (err) {
this.destination.error(err);
return;
}
this.active++;
this._innerSub(result, value, index);
}
private _innerSub(ish: ObservableInput<I>, value: T, index: number): void {
this.add(subscribeToResult<T, I>(this, ish, value, index));
}
protected _complete(): void {
this.hasCompleted = true;
if (this.active === 0 && this.buffer.length === 0) {
this.destination.complete();
}
}
notifyNext(outerValue: T, innerValue: I,
outerIndex: number, innerIndex: number,
innerSub: InnerSubscriber<T, I>): void {
if (this.resultSelector) {
this._notifyResultSelector(outerValue, innerValue, outerIndex, innerIndex);
} else {
this.destination.next(innerValue);
}
}
private _notifyResultSelector(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number) {
let result: R;
try {
result = this.resultSelector(outerValue, innerValue, outerIndex, innerIndex);
} catch (err) {
this.destination.error(err);
return;
}
this.destination.next(result);
}
notifyComplete(innerSub: Subscription): void {
const buffer = this.buffer;
this.remove(innerSub);
this.active--;
if (buffer.length > 0) {
this._next(buffer.shift());
} else if (this.active === 0 && this.hasCompleted) {
this.destination.complete();
}
}
}