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import { nil, QueryError, Schema, SchemaField } from '../interfaces.ts';import { IValue, setId, _ISchema, _IType, _Transaction } from '../interfaces-private.ts';import { Expr } from 'https://deno.land/x/pgsql_ast_parser@12.0.1/mod.ts';import { ReadOnlyTable } from './readonly-table.ts';import { buildValue } from '../parser/expression-builder.ts';import { Types } from '../datatypes/index.ts';import { withSelection, buildCtx } from '../parser/context.ts';
let cnt = 0;export class ValuesTable extends ReadOnlyTable {    private symbol = Symbol();    _schema!: Schema;    private assignments!: (IValue<any> | "default")[][];
    entropy(t: _Transaction): number {        return 0;    }
    enumerate(t: _Transaction): Iterable<any> {        const ret = this.assignments.map(vals => {            const ret = { [this.symbol]: true } as any;            setId(ret, 'vtbl' + (++cnt));            for (let i = 0; i < vals.length; i++) {                const v = vals[i];                ret[this._schema.fields[i].name] = v === 'default'                    ? null                    : v.get({}, t);            }            return ret;        });        return ret;    }
    hasItem(value: any, t: _Transaction): boolean {        return !!value[this.symbol];    }
    constructor(alias: string, items: Expr[][], columnNames: string[] | nil, acceptDefault?: boolean) {        super(buildCtx().schema);        withSelection(buildCtx().schema.dualTable.selection, () => {            const len = new Set(items.map(x => x.length));            if (len.size !== 1) {                throw new QueryError('VALUES lists must all be the same length');            }            if (columnNames && columnNames.length > items[0].length) {                throw new QueryError(`table "${alias}" has ${items[0].length} columns available but ${columnNames.length} columns specified`);            }            type V = IValue | 'default';            let builtVals: V[][] = items.map(vals => vals.map(e => {                if (acceptDefault && e.type === 'default') {                    return 'default';                }                return buildValue(e);            }));            const types = items[0].map((_, i) => {                return preferedType(builtVals.map(x => {                    const v = x[i];                    return v === 'default'                        ? null                        : v.type;                }))            });            this._schema = {                name: alias,                fields: types.map<SchemaField>((type, i) => {                    return {                        type: type ?? Types.default,                        name: columnNames?.[i] ?? `column${i + 1}`,                    }                })            };            this.assignments = builtVals.map(vals => vals.map((v, i) => v === 'default' ? v : v.cast(types[i]!)))        });    }}
function preferedType(types: (_IType | null)[]) {    return types.reduce((a, b) => {        if (!a) {            return b;        }        if (!b) {            return a;        }        const ret = a.prefer(b);        if (!ret) {            throw new QueryError('Incompatible value types');        }        return ret;    }, types[0]);}