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import { _ITable, _ISelection, _ISchema, _Transaction, _IIndex, IValue, NotSupported, PermissionDeniedError, _Column, SchemaField, IndexDef, _Explainer, _SelectExplanation, _IType, ChangeHandler, Stats, DropHandler, IndexHandler, RegClass, RegType, Reg, _IConstraint, TruncateHandler } from '../interfaces-private.ts';import { CreateColumnDef, ExprRef, TableConstraint } from 'https://deno.land/x/pgsql_ast_parser@12.0.1/mod.ts';import { DataSourceBase } from '../transforms/transform-base.ts';import { Schema, ColumnNotFound, nil, ISubscription, ColumnDef } from '../interfaces.ts';import { buildAlias } from '../transforms/alias.ts';import { columnEvaluator } from '../transforms/selection.ts';import { colByName, findTemplate } from '../utils.ts';
export abstract class ReadOnlyTable<T = any> extends DataSourceBase<T> implements _ITable, _ISelection {

    get isExecutionWithNoResult(): boolean {        return false;    }
    get primaryIndex(): nil | IndexDef {        return null;    }
    getColumns(): Iterable<ColumnDef> {        throw new Error('Method not implemented on schema tables.');    }
    abstract entropy(t: _Transaction): number;    abstract enumerate(t: _Transaction): Iterable<T>;    abstract hasItem(value: T, t: _Transaction): boolean;    abstract readonly _schema: Schema;
    reg!: Reg;
    readonly selection: _ISelection = buildAlias(this);    readonly hidden = true;
    isOriginOf(v: IValue): boolean {        return v.origin === this || v.origin === this.selection;    }

    get type() {        return 'table' as const;    }
    constructor(private schema: _ISchema) {        super(schema);    }
    get name(): string {        return this._schema.name;    }
    register() {        this.reg = this.schema._reg_register(this);    }
    private columnsById = new Map<string, IValue>();    private _columns?: IValue[];

    private build() {        if (this._columns) {            return;        }        this._columns = [];        for (const _col of this._schema.fields) {            const newCol = columnEvaluator(this, _col.name, _col.type as _IType);            this._columns.push(newCol);            this.columnsById.set(_col.name, newCol);        }    }
    get columns(): ReadonlyArray<IValue<any>> {        this.build();        return this._columns!;    }
    getColumn(column: string | ExprRef): IValue;    getColumn(column: string | ExprRef, nullIfNotFound?: boolean): IValue | nil;    getColumn(column: string | ExprRef, nullIfNotFound?: boolean): IValue<any> | nil {        this.build();        if (typeof column !== 'string'            && column.table) {            if (!column.table.schema                && column.table.name !== this.name) {                return null;            }            column = column.name;        }        return colByName(this.columnsById, column, nullIfNotFound);    }
    explain(e: _Explainer): _SelectExplanation {        throw new PermissionDeniedError(this.name);    }
    listIndices(): IndexDef[] {        return [];    }
    stats(t: _Transaction): Stats | null {        throw new NotSupported('stats (count, ...) on information schema');    }
    rename(to: string): this {        throw new PermissionDeniedError(this.name);    }    update(t: _Transaction, toUpdate: any) {        throw new PermissionDeniedError(this.name);    }    addColumn(column: SchemaField | CreateColumnDef): _Column {        throw new PermissionDeniedError(this.name);    }    getColumnRef(column: string, nullIfNotFound?: boolean): _Column {        throw new PermissionDeniedError(this.name);    }    getConstraint(constraint: string): _IConstraint | nil {        return null;    }    addConstraint(constraint: TableConstraint, t: _Transaction): _IConstraint {        throw new PermissionDeniedError(this.name);    }    insert(item: any) {        throw new PermissionDeniedError(this.name);    }    doInsert(toInsert: any): void {        throw new PermissionDeniedError(this.name);    }    delete(t: _Transaction, toDelete: T): void {        throw new PermissionDeniedError(this.name);    }    truncate(t: _Transaction): void {        throw new PermissionDeniedError(this.name);    }
    createIndex(): _IConstraint {        throw new PermissionDeniedError(this.name);    }    dropIndex(t: _Transaction, name: string): void {        throw new PermissionDeniedError(this.name);    }    setHidden(): this {        throw new PermissionDeniedError(this.name);    }    drop(t: _Transaction): void {        throw new PermissionDeniedError(this.name);    }
    setReadonly(): this {        return this;    }
    getIndex(...forValue: IValue[]): _IIndex<any> | nil {        return null;    }
    on(): any {        throw new NotSupported('subscribing information schema');    }    onBeforeChange(columns: string[], check: ChangeHandler<T>) {        // nop        return { unsubscribe() { } }    }    onCheckChange(columns: string[], check: ChangeHandler<T>) {        // nop        return { unsubscribe() { } }    }    onTruncate(sub: TruncateHandler): ISubscription {        // nop        return { unsubscribe() { } }    }    onDrop(sub: DropHandler): ISubscription {        // nop        return { unsubscribe() { } }    }    onIndex(sub: IndexHandler): ISubscription {        // nop        return { unsubscribe() { } }    }

    find(template?: T, columns?: (keyof T)[]): Iterable<T> {        return findTemplate(this.selection, this.db.data, template, columns);    }

    make(table: _ITable, i: number, t: IValue<any>): any {        throw new Error('not implemented');    }

    *itemsByTable(table: string | _ITable, t: _Transaction): IterableIterator<any> {        if (typeof table === 'string') {            for (const s of this.db.listSchemas()) {                const got = s.getTable(table, true);                if (got) {                    yield* this.itemsByTable(got, t);                }            }        } else {            let i = 0;            for (const f of table.selection.columns) {                yield this.make(table, ++i, f);            }        }    }}