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JOLIMAITRE Matthieu 2024-05-29 03:57:05 +02:00
commit fc701bec68
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import { z } from "https://deno.land/x/zod@v3.22.4/mod.ts";
import { QueriedFor, QueriedOfField, Table } from "./typing.ts";
import { Store } from "./store.ts";
import { StoredFor } from "./typing.ts";
export class Entry<T extends Table<T>, S extends keyof T> {
public readonly store;
public readonly schema;
public readonly id;
public constructor(store: Store<T>, schema: S, id: string) {
this.store = store;
this.schema = schema;
this.id = id;
}
public async get<F extends keyof T[S]>(field: F): Promise<QueriedOfField<T, S, F>> {
if (!await this.store.entry_exists(this.schema, this.id)) throw new Error("Accessing a deleted entry");
const str = (value: unknown) => z.string().parse(value);
const content = await this.store.read_field(this.schema, this.id, field);
const kind = this.store.nodes.table[this.schema][field];
if (kind === "string") return z.string().parse(content) as QueriedFor<T, T[S][F]>;
if (kind === "number") return z.number().parse(content) as QueriedFor<T, T[S][F]>;
if (kind === "boolean") return z.boolean().parse(content) as QueriedFor<T, T[S][F]>;
if (kind[0] === "maybe") {
if (content === null) return null as QueriedFor<T, T[S][F]>;
else return new Entry(this.store, kind[1], str(content)) as QueriedFor<T, T[S][F]>;
}
if (kind[0] === "one") return new Entry(this.store, kind[1], str(content)) as QueriedFor<T, T[S][F]>;
if (kind[0] === "many") return new Collection(this.store, kind[1], str(content)) as QueriedFor<T, T[S][F]>;
throw new Error("Unreachable");
}
public async set<F extends keyof T[S]>(field: F, value: QueriedFor<T, T[S][F]>) {
let raw: string | number | boolean | null;
if (value instanceof Collection) raw = value.id;
else if (value instanceof Entry) raw = value.id;
else raw = value;
await this.store.write_field(this.schema, this.id, field, raw as StoredFor<T, T[S][F]>);
}
public async delete() {
const schema = this.store.nodes.table[this.schema];
for (const field in schema) {
const kind = schema[field];
if (Array.isArray(kind) && kind[0] === "many") {
// deno-lint-ignore no-explicit-any
const collection = await this.get(field) as Collection<T, any>;
for await (const value of collection) this.store.remove_relation(collection.id, value.id);
await this.store.delete_relations(collection.id);
}
await this.store.delete_field(this.schema, this.id, field);
}
await this.store.delete_entry(this.schema, this.id);
}
}
export class Collection<T extends Table<T>, S extends keyof T> {
public readonly store;
public readonly schema;
public readonly id;
public constructor(store: Store<T>, schema: S, collection_id: string) {
this.store = store;
this.schema = schema;
this.id = collection_id;
}
public async *[Symbol.asyncIterator]() {
for await (const id_ of this.store.list_relations(this.id)) {
const id = z.string().parse(id_);
const entry = new Entry(this.store, this.schema, id);
if (await this.store.entry_exists(this.schema, id)) yield entry;
else await this.remove(entry);
}
}
public async add(entry: Entry<T, S>) {
await this.store.add_relation(this.id, entry.id);
}
public async remove(entry: Entry<T, S>) {
await this.store.remove_relation(this.id, entry.id);
}
}