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import { Field, Opt } from "./Doc";
import { List } from "./List";
export type ToType<T> =
T extends "string" ? string :
T extends "number" ? number :
T extends "boolean" ? boolean :
T extends ListSpec<infer U> ? List<U> :
T extends { new(...args: any[]): infer R } ? R : never;
export type ToConstructor<T> =
T extends string ? "string" :
T extends number ? "number" :
T extends boolean ? "boolean" : { new(...args: any[]): T };
export type ToInterface<T> = {
[P in keyof T]: ToType<T[P]>;
};
// type ListSpec<T extends Field[]> = { List: FieldCtor<Head<T>> | ListSpec<Tail<T>> };
export type ListSpec<T> = { List: FieldCtor<T> };
// type ListType<U extends Field[]> = { 0: List<ListType<Tail<U>>>, 1: ToType<Head<U>> }[HasTail<U> extends true ? 0 : 1];
export type Head<T extends any[]> = T extends [any, ...any[]] ? T[0] : never;
export type Tail<T extends any[]> =
((...t: T) => any) extends ((_: any, ...tail: infer TT) => any) ? TT : [];
export type HasTail<T extends any[]> = T extends ([] | [any]) ? false : true;
export interface Interface {
[key: string]: ToConstructor<Field> | ListSpec<Field>;
// [key: string]: ToConstructor<Field> | ListSpec<Field[]>;
}
export type FieldCtor<T extends Field> = ToConstructor<T> | ListSpec<T>;
export function Cast<T extends FieldCtor<Field>>(field: Field | null | undefined, ctor: T): ToType<T> | null | undefined {
if (field !== undefined && field !== null) {
if (typeof ctor === "string") {
if (typeof field === ctor) {
return field as ToType<T>;
}
} else if (typeof ctor === "object") {
if (field instanceof List) {
return field as ToType<T>;
}
} else if (field instanceof (ctor as any)) {
return field as ToType<T>;
}
} else {
return field;
}
return undefined;
}
export function FieldValue<T extends Field>(field: Opt<T> | Promise<Opt<T>>): Opt<T> {
return field instanceof Promise ? undefined : field;
}
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