/**
 * Chart view keeps a D1 ascendant precheck beside the natal chart.
 * A failed scan leaves the field off and the chart at 200. Fictional fixture only.
 */
import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import test from "node:test";

import { assembleChartView, type ChartViewEnginePost } from "../src/lib/chart-view-load.ts";
import { fetchLagnaPrecheck } from "../src/lib/lagna-precheck-fetch.ts";
import { mapLagnaPrecheck, type ChartViewProfileInput } from "../src/lib/chart-view-mapper.ts";
import type { LagnaPrecheckWindow } from "../src/lib/lagna-precheck.ts";
const golden = JSON.parse(
  readFileSync(new URL("./fixtures/chart-view-golden.json", import.meta.url), "utf8"),
) as { chart: Record<string, unknown> };

const profile: ChartViewProfileInput = {
  name: "示例",
  date: "1990-06-15",
  time: "12:00",
  placeLabel: "北京",
  latitude: 39.9,
  longitude: 116.4,
  timezoneOffset: 8,
  ayanamsa: "raman",
};

const birthWindow: LagnaPrecheckWindow = {
  start_at: "1990-06-15T11:58",
  end_at: "1990-06-15T12:02",
  minutes: 5,
  source: "hospital_record",
  precisionKind: "minutes",
  beforeMinutes: 2,
  afterMinutes: 2,
};

function postEngine(fail = false): ChartViewEnginePost {
  return async (path) => {
    if (fail || path !== "/api/chart") return { status: "http_error", path, elapsedMs: 1, httpStatus: 500 };
    return { status: "ok", payload: golden.chart };
  };
}

test("one D1 segment is fixed and two segments name the change clock", () => {
  const fixed = mapLagnaPrecheck(birthWindow, {
    segments: { D1: [{ sign: 0, start_at: "1990-06-15T11:58", end_at: "1990-06-15T12:02" }] },
  });
  assert.equal(fixed?.state, "fixed");
  assert.deepEqual(fixed?.signs, ["白羊"]);
  assert.equal(fixed?.changeAt, undefined);

  const changed = mapLagnaPrecheck(birthWindow, {
    segments: { D1: [
      { sign: 0, start_at: "1990-06-15T11:58", end_at: "1990-06-15T12:00" },
      { sign: 1, start_at: "1990-06-15 12:01", end_at: "1990-06-15T12:02" },
    ] },
  });
  assert.equal(changed?.state, "may_change");
  assert.deepEqual(changed?.signs, ["白羊", "金牛"]);
  assert.deepEqual(changed?.changeAt, ["12:01"]);

  const unknown = mapLagnaPrecheck({ ...birthWindow, source: "unknown", precisionKind: "unknown" }, {
    segments: { D1: [{ sign: 2, start_at: "1990-06-15T00:00", end_at: "1990-06-15T23:59" }] },
  });
  assert.equal(unknown?.state, "unknown_time");
  assert.equal(mapLagnaPrecheck(birthWindow, { segments: { D1: [] } }), null);
  assert.equal(mapLagnaPrecheck(birthWindow, { segments: { D1: [{ sign: 12, start_at: "1990-06-15T11:58" }] } }), null);
});

test("a thrown or non-ok segment scan returns null and does not call boundary charts", async () => {
  const thrown = await fetchLagnaPrecheck({
    window: birthWindow,
    latitude: 39.9,
    longitude: 116.4,
    timezoneOffset: 8,
    fetchImpl: async () => { throw new Error("down"); },
  });
  assert.equal(thrown, null);

  const failed = await fetchLagnaPrecheck({
    window: birthWindow,
    latitude: 39.9,
    longitude: 116.4,
    timezoneOffset: 8,
    fetchImpl: async () => new Response("no", { status: 500 }),
  });
  assert.equal(failed, null);

  const seen: { body: Record<string, unknown> | null } = { body: null };
  const ok = await fetchLagnaPrecheck({
    window: birthWindow,
    latitude: 39.9,
    longitude: 116.4,
    timezoneOffset: 8,
    ayanamsa: "raman",
    fetchImpl: async (_url, init) => {
      seen.body = JSON.parse(String(init?.body)) as Record<string, unknown>;
      assert.equal(init?.signal instanceof AbortSignal, true);
      return new Response(JSON.stringify({
        segments: { D1: [{ sign: 0, start_at: "1990-06-15T11:58", end_at: "1990-06-15T12:02" }] },
      }), { status: 200 });
    },
  });
  assert.equal(ok?.state, "fixed");
  assert.ok(seen.body);
  assert.deepEqual(seen.body.target_charts, ["D1"]);
  assert.equal("boundary_charts" in seen.body, false);
  assert.equal(seen.body.start_at, "1990-06-15T11:58");
});

test("a rejected precheck is omitted and a failed chart does not wait for it", async () => {
  const ok = await assembleChartView({
    userId: "user-1",
    profile,
    postEngine: postEngine(),
    asOf: "2026-09-15",
    lagnaPrecheck: Promise.resolve(mapLagnaPrecheck(birthWindow, {
      segments: { D1: [
        { sign: 0, start_at: "1990-06-15T11:58", end_at: "1990-06-15T12:00" },
        { sign: 1, start_at: "1990-06-15T12:01", end_at: "1990-06-15T12:02" },
      ] },
    })),
  });
  assert.equal(ok.httpStatus, 200);
  assert.equal(ok.body.status, "ok");
  assert.equal(ok.body.status === "ok" ? ok.body.lagnaPrecheck?.state : null, "may_change");

  const rejected = await assembleChartView({
    userId: "user-1",
    profile,
    postEngine: postEngine(),
    asOf: "2026-09-15",
    lagnaPrecheck: Promise.reject(new Error("timeout")),
  });
  assert.equal(rejected.httpStatus, 200);
  assert.equal(rejected.body.status, "ok");
  assert.equal(rejected.body.status === "ok" && rejected.body.lagnaPrecheck, undefined);

  const failedChart = await assembleChartView({
    userId: "user-1",
    profile,
    postEngine: postEngine(true),
    asOf: "2026-09-15",
    lagnaPrecheck: new Promise(() => {}),
  });
  assert.equal(failedChart.httpStatus, 200);
  assert.notEqual(failedChart.body.status, "ok");
  assert.equal("lagnaPrecheck" in failedChart.body, false);
});