validator.ts

import * as v from "valibot";

/*
API REFERENCE:
https://developers.notion.com/docs/working-with-databases
https://developers.notion.com/reference/property-value-object
*/

// S: Schema
// never throws error, purely for logging purpose.
export function check<S extends v.BaseSchema<unknown, unknown, v.BaseIssue<unknown>>>(
  varName: string,
  val: unknown,
  schema: S,
): {
  val: v.InferOutput<S>;
  err?: string;
} {
  type O = v.InferOutput<S>; // output

  const result = v.safeParse(schema, val);
  if (result.success) return { val: result.output satisfies O };

  const error = result.issues.map((issue) => issue.message).join(", ");
  console.error(`WARNING: Failed to parse schema of ${varName}: ${error}`);
  return {
    err: error,
    val: val as O, // just let it go until it crashes for `cannot access property of undefined` or worse, sends undefined to slack	};
  };
}

export class TypeChecker {
  check<S extends v.BaseSchema<unknown, unknown, v.BaseIssue<unknown>>>(name: string, val: unknown, schema: S) {
    const { val: parsed, err } = check(name, val, schema);
    if (err) {
      this.failedCount++;
      this.errors += `\n- ${err}`;
    }
    return parsed;
  }
  failedCount = 0;
  errors = "";
  hasFailed() {
    return this.failedCount > 0;
  }
}

export const Url = v.pipe(v.string(), v.url());

const NotionDate = v.object({
  type: v.literal("date"),
  date: v.object({
    start: v.pipe(v.string(), v.regex(/\d{4}-\d{2}-\d{2}/) /* yyyy-MM-dd */),
  }),
});
const NotionText = v.object({
  type: v.literal("text"),
  text: v.object({
    content: v.string(),
  }),
  plain_text: v.string(),
});
const NotionTitle = v.object({
  type: v.literal("title"),
  title: v.array(v.union([NotionText])),
});

// API REFERENCE[user]: https://developers.notion.com/reference/user
const NotionUser = v.object({
  object: v.literal("user"),
  id: v.pipe(v.string(), v.uuid()),
  name: v.union([v.string(), v.undefined()]),
});

const NotionPeople = v.object({
  type: v.literal("people"),
  people: v.array(NotionUser),
});

export const NotionTypes = {
  date: NotionDate,
  text: NotionText,
  title: NotionTitle,
  user: NotionUser,
  people: NotionPeople,
};