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import { Interface, ToInterface, Cast, FieldCtor, ToConstructor, HasTail, Head, Tail } from "./Types";
import { Doc } from "./Doc";
type All<T extends any[], U extends Doc> = {
1: makeInterface<Head<T>, U> & All<Tail<T>, U>,
0: makeInterface<Head<T>, U>
}[HasTail<T> extends true ? 1 : 0];
type AllToInterface<T extends any[]> = {
1: ToInterface<Head<T>> & AllToInterface<Tail<T>>,
0: ToInterface<Head<T>>
}[HasTail<T> extends true ? 1 : 0];
export type makeInterface<T extends Interface[], U extends Doc = Doc> = Partial<AllToInterface<T>> & U;
// export function makeInterface<T extends Interface[], U extends Doc>(schemas: T): (doc: U) => All<T, U>;
// export function makeInterface<T extends Interface, U extends Doc>(schema: T): (doc: U) => makeInterface<T, U>;
export function makeInterface<T extends Interface[], U extends Doc>(schemas: T): (doc: U) => All<T, U> {
let schema: Interface = {};
for (const s of schemas) {
for (const key in s) {
schema[key] = s[key];
}
}
return function (doc: any) {
return new Proxy(doc, {
get(target, prop) {
const field = target[prop];
if (prop in schema) {
return Cast(field, (schema as any)[prop]);
}
return field;
}
});
};
}
export type makeStrictInterface<T extends Interface> = Partial<ToInterface<T>>;
export function makeStrictInterface<T extends Interface>(schema: T): (doc: Doc) => makeStrictInterface<T> {
const proto = {};
for (const key in schema) {
const type = schema[key];
Object.defineProperty(proto, key, {
get() {
return Cast(this.__doc[key], type as any);
},
set(value) {
value = Cast(value, type as any);
if (value !== undefined) {
this.__doc[key] = value;
return;
}
throw new TypeError("Expected type " + type);
}
});
}
return function (doc: any) {
const obj = Object.create(proto);
obj.__doc = doc;
return obj;
};
}
export function createSchema<T extends Interface>(schema: T): T & { prototype: ToConstructor<Doc> } {
schema.prototype = Doc;
return schema as any;
}
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