import { readFileSync } from "node:fs";

import { birthSkyCaption } from "../src/lib/birth-sky/caption.ts";
import { birthSkyFromEngine, type BirthSkyOk, type BirthSkyPhase } from "../src/lib/birth-sky/contract.ts";

/** Real engine responses (scripts/generate_birth_sky_golden.py), fictional sample birth. */
export const birthSkyGolden = JSON.parse(
  readFileSync(new URL("./fixtures/birth-sky-golden.json", import.meta.url), "utf8"),
) as { times: Record<BirthSkyPhase, string>; responses: Record<BirthSkyPhase, Record<string, unknown>> };

/** Fictional sample place label, in the China picker's `省 · 市 · 区` shape. */
export const GOLDEN_PLACE_LABEL = "浙江省 · 杭州市 · 西湖区";

/** The caption the BFF would build for the fictional sample at this phase's time. */
export function goldenCaption(phase: BirthSkyPhase): string {
  const caption = birthSkyCaption({ date: "1994-05-18", time: birthSkyGolden.times[phase], placeLabel: GOLDEN_PLACE_LABEL });
  if (!caption) throw new Error(`golden ${phase} has no caption`);
  return caption;
}

export function goldenSky(phase: BirthSkyPhase, timeBasis: BirthSkyOk["timeBasis"] = "reported"): BirthSkyOk {
  const sky = birthSkyFromEngine(birthSkyGolden.responses[phase], timeBasis, goldenCaption(phase));
  if (!sky) throw new Error(`golden ${phase} does not satisfy the contract`);
  return sky;
}