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import { Interface, ToInterface, Cast, ToConstructor, HasTail, Head, Tail, ListSpec, ToType } from "./Types";
import { Doc, Field } from "./Doc";
type AllToInterface<T extends Interface[]> = {
1: ToInterface<Head<T>> & AllToInterface<Tail<T>>,
0: ToInterface<Head<T>>
}[HasTail<T> extends true ? 1 : 0];
export const emptySchema = createSchema({});
export const Document = makeInterface(emptySchema);
export type Document = makeInterface<[typeof emptySchema]>;
export type makeInterface<T extends Interface[]> = Partial<AllToInterface<T>> & Doc & { proto: Doc | undefined };
// 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[]>(...schemas: T): (doc?: Doc) => makeInterface<T> {
let schema: Interface = {};
for (const s of schemas) {
for (const key in s) {
schema[key] = s[key];
}
}
const proto = new Proxy({}, {
get(target: any, prop, receiver) {
const field = receiver.doc[prop];
if (prop in schema) {
return Cast(field, (schema as any)[prop]);
}
return field;
},
set(target: any, prop, value, receiver) {
receiver.doc[prop] = value;
return true;
}
});
return function (doc?: Doc) {
doc = doc || new Doc;
if (!(doc instanceof Doc)) {
throw new Error("Currently wrapping a schema in another schema isn't supported");
}
const obj = Object.create(proto, { doc: { value: doc, writable: false } });
return obj;
};
}
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) {
if (!(doc instanceof Doc)) {
throw new Error("Currently wrapping a schema in another schema isn't supported");
}
const obj = Object.create(proto);
obj.__doc = doc;
return obj;
};
}
export function createSchema<T extends Interface>(schema: T): T & { proto: ToConstructor<Doc> } {
schema.proto = Doc;
return schema as any;
}
export function listSpec<U extends ToConstructor<Field>>(type: U): ListSpec<ToType<U>> {
return { List: type as any };//TODO Types
}
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