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import { _IIndex, IValue, _ITable, _IDb, _Transaction, _Explainer, _IndexExplanation, IndexOp, IndexKey, Stats } from '../interfaces-private.ts';import { PermissionDeniedError, NotSupported } from '../interfaces.ts';
export class TableIndex implements _IIndex {    readonly expressions: IValue<any>[];
    get hash(): string {        throw new Error('not implemented');    }    explain(e: _Explainer): _IndexExplanation {        throw new Error('not implemented');    }
    stats(t: _Transaction, key?: IndexKey): Stats | null {        return null;    }
    iterateKeys() {        return null;    }
    constructor(readonly onTable: _ITable & { itemsByTable(table: string, t: _Transaction): Iterable<any>; ownSymbol: any }, private col: IValue) {        this.expressions = [col];    }
    get indexName(): string {        return 'index_table_name_name';    }
    entropy(op: IndexOp): number {        return this.onTable.db.listSchemas()            .reduce((tot, s) => tot + s.tablesCount(op.t) * 10 * 3, 0);    }

    add(raw: any): void {        throw new PermissionDeniedError('tables');    }
    eqFirst([key]: any, t: _Transaction) {        for (const its of this.onTable.itemsByTable(key, t)) {            return its;        }    }    *eq([rawKey]: any, t: _Transaction): Iterable<any> {        for (const its of this.onTable.itemsByTable(rawKey, t)) {            yield its;        }    }
    *nin(keys: any[][], t: _Transaction) {        const raws = keys.map(x => x[0]) as any[];        for (const i of this.onTable.selection.enumerate(t)) {            if (raws.includes(i.table_name)) {                continue;            }            yield i;        }    }
    *neq([rawKey]: any, t: _Transaction) {        for (const i of this.onTable.selection.enumerate(t)) {            if (i.table_name !== rawKey) {                yield i;            }        }    }    *gt(rawKey: any, t: _Transaction): Iterable<any> {        for (const i of this.onTable.selection.enumerate(t)) {            if (i.table_name > rawKey) {                yield i;            }        }    }    *lt(rawKey: any, t: _Transaction): Iterable<any> {        for (const i of this.onTable.selection.enumerate(t)) {            if (i.table_name < rawKey) {                yield i;            }        }    }    *ge(rawKey: any, t: _Transaction): Iterable<any> {        for (const i of this.onTable.selection.enumerate(t)) {            if (i.table_name >= rawKey) {                yield i;            }        }    }    *le(rawKey: any, t: _Transaction): Iterable<any> {        for (const i of this.onTable.selection.enumerate(t)) {            if (i.table_name <= rawKey) {                yield i;            }        }    }

    enumerate(op: IndexOp): Iterable<any> {        switch (op.type) {            case 'eq':                return this.eq(op.key, op.t);            case 'neq':                return this.neq(op.key, op.t);            case 'ge':                return this.ge(op.key, op.t);            case 'le':                return this.le(op.key, op.t);            case 'gt':                return this.gt(op.key, op.t);            case 'lt':                return this.lt(op.key, op.t);            case 'outside':                return this.outside(op.lo, op.hi, op.t);            case 'inside':                return this.inside(op.lo, op.hi, op.t);            case 'nin':                return this.nin(op.keys, op.t);            default:                throw NotSupported.never(op['type']);        }    }
    *outside(lo: IndexKey, hi: IndexKey, t: _Transaction): Iterable<any> {        yield* this.lt(lo, t);        yield* this.gt(hi, t);    }
    *inside(lo: IndexKey, hi: IndexKey, t: _Transaction): Iterable<any> {        throw new Error('Not implemented');    }}