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import { Interface, ToInterface, Cast, ToConstructor, HasTail, Head, Tail, ListSpec, ToType, DefaultFieldConstructor } from './Types';
import { Doc, Field } from './Doc';
import { ObjectField } from './ObjectField';
import { RefField } from './RefField';
import { SelfProxy } from './DocSymbols';
import { List } from './List';
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 interface InterfaceFunc<T extends Interface[]> {
(docs: Doc[]): makeInterface<T>[];
(): makeInterface<T>;
(doc: Doc): makeInterface<T>;
}
export type makeInterface<T extends Interface[]> = AllToInterface<T> & Doc & { proto: Doc | undefined };
export function makeInterface<T extends Interface[]>(...schemas: T): InterfaceFunc<T> {
const 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) {
const desc = prop === 'proto' ? Doc : (schema as any)[prop]; // bcz: proto doesn't appear in schemas ... maybe it should?
if (typeof desc === 'object' && 'defaultVal' in desc && 'type' in desc) {
//defaultSpec
return Cast(field, desc.type, desc.defaultVal);
}
if (typeof desc === 'function' && !ObjectField.isPrototypeOf(desc) && !RefField.isPrototypeOf(desc)) {
const doc = Cast(field, Doc);
if (doc === undefined) {
return undefined;
}
if (doc instanceof Doc) {
return desc(doc);
}
return doc.then(doc => doc && desc(doc));
}
return Cast(field, desc);
}
return field;
},
set(target: any, prop, value, receiver) {
receiver.doc && (receiver.doc[prop] = value); // receiver.doc may be undefined as the result of a change in acls
return true;
},
}
);
// !(doc instanceof Doc) && (throw new Error("Currently wrapping a schema in another schema isn't supported"));
const fn = (doc: Doc) => Object.create(proto, { doc: { value: doc[SelfProxy], writable: false } });
return ((doc?: Doc | Doc[]) => (doc instanceof List ? doc : undefined)?.map?.(fn) ?? fn((doc as Doc) ?? new Doc())) as InterfaceFunc<T>;
}
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 as any).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
}
export function defaultSpec<T extends ToConstructor<Field>>(type: T, defaultVal: ToType<T>): DefaultFieldConstructor<ToType<T>> {
return {
type: type as any,
defaultVal,
};
}
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