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import { _ISelection, IValue, _IIndex, _ITable, getId, _Transaction, _Explainer, _SelectExplanation, Stats } from '../interfaces-private.ts';import { FilterBase } from './transform-base.ts';import { DataType, CastError, QueryError } from '../interfaces.ts';import { nullIsh } from '../utils.ts';
export class InFilter<T = any> extends FilterBase<T> {

    private index: _IIndex;
    entropy(t: _Transaction) {        let ret = 0;        for (const a of this.elts) {            ret += this.index.entropy({                type: 'eq',                key: [a],                t,            });        }        return ret;    }
    hasItem(item: T, t: _Transaction) {        const val = this.onValue.get(item, t);        return !nullIsh(val)            && this.elts.some(x => this.onValue.type.equals(x, val));    }
    constructor(private onValue: IValue<T>        , private elts: any[]) {        super(onValue.origin!);        this.index = onValue.index!;        if (this.index.expressions.length !== 1) {            throw new Error('Only supports IN with signle expressions index');        }        if (!Array.isArray(elts)) {            throw new QueryError('Cannot iterate element list');        }    }
    stats(t: _Transaction): Stats | null {        const elts = this.elts.map(x => this.index.stats(t, [x]));        if (elts.some(x => !x)) {            return null;        }        // compute from elements        const ret: Stats = {            count: 0,        };        for (const i of elts) {            ret.count += i!.count;        }        return ret;    }
    *enumerate(t: _Transaction): Iterable<T> {        for (const a of this.elts) {            yield* this.index.enumerate({                type: 'eq',                key: [a],                t,            });        }    }

    explain(e: _Explainer): _SelectExplanation {        return {            id: e.idFor(this),            _: 'eq',            entropy: this.entropy(e.transaction),            on: this.index.explain(e),        };    }}