import assert from "node:assert/strict";
import test from "node:test";

import {
  CHART_VIEW_ENGINE_CACHE_TTL_MS,
  CHART_VIEW_ENGINE_TIMEOUT_MS,
  chartViewEngineCacheKey,
  clearChartViewEngineCache,
  engineCallFromHttp,
  engineCallFromThrown,
  logEngineCallFailure,
  parseChartViewLayers,
  readChartViewEngineCache,
  writeChartViewEngineCache,
} from "../src/lib/chart-view-engine.ts";

function captureWarnings(run: () => void): unknown[] {
  const warnings: unknown[] = [];
  const original = console.warn;
  console.warn = (...args: unknown[]) => {
    warnings.push(args);
  };
  try {
    run();
  } finally {
    console.warn = original;
  }
  return warnings;
}

const baseKey = {
  userId: "user-1",
  date: "1990-04-09",
  time: "12:00",
  latitude: 39.9042,
  longitude: 116.4074,
  timezoneOffset: 8,
  ayanamsa: "raman",
  nodeMode: "mean",
  path: "/api/chart",
};

test("engine HTTP outcomes classify 429, other errors, and bad JSON separately", () => {
  assert.equal(engineCallFromHttp({
    path: "/api/chart",
    elapsedMs: 12,
    httpStatus: 429,
    payload: { error: "busy" },
  }).status, "busy");
  assert.equal(engineCallFromHttp({
    path: "/api/chart",
    elapsedMs: 12,
    httpStatus: 500,
    payload: { error: "boom" },
  }).status, "http_error");
  assert.equal(engineCallFromHttp({
    path: "/api/chart",
    elapsedMs: 12,
    httpStatus: 200,
    payload: "not-json-object",
  }).status, "bad_payload");
  assert.equal(engineCallFromHttp({
    path: "/api/chart",
    elapsedMs: 12,
    httpStatus: 200,
    payload: null,
  }).status, "bad_payload");
});

test("timeout and abort errors classify as timeout; other throws as http_error", () => {
  const timeout = engineCallFromThrown("/api/chart", 10_001, Object.assign(new Error("aborted"), { name: "TimeoutError" }));
  assert.equal(timeout.status, "timeout");
  const abort = engineCallFromThrown("/api/chart", 10_001, Object.assign(new Error("aborted"), { name: "AbortError" }));
  assert.equal(abort.status, "timeout");
  const network = engineCallFromThrown("/api/chart", 30, Object.assign(new Error("fetch failed"), { name: "TypeError" }));
  assert.equal(network.status, "http_error");
  assert.equal(network.errorName, "TypeError");
});

test("each non-ok engine result logs path, status, and elapsed ms without birth fields", () => {
  const cases = [
    { status: "busy" as const, httpStatus: 429 },
    { status: "http_error" as const, httpStatus: 500 },
    { status: "timeout" as const, errorName: "TimeoutError" },
    { status: "bad_payload" as const, httpStatus: 200 },
  ];
  const seen = new Set<string>();
  for (const item of cases) {
    const warnings = captureWarnings(() => {
      logEngineCallFailure({
        path: "/api/chart",
        elapsedMs: 18,
        ...item,
      });
    });
    assert.equal(warnings.length, 1);
    const line = JSON.stringify(warnings[0]);
    assert.match(line, /chart_view_engine_failed/);
    assert.match(line, new RegExp(item.status));
    assert.match(line, /"elapsedMs":18/);
    assert.doesNotMatch(line, /1990|latitude|longitude|name|birth/);
    seen.add(item.status);
  }
  assert.deepEqual([...seen], ["busy", "http_error", "timeout", "bad_payload"]);
});

test("engine cache keys include ayanamsa and node mode and expire", () => {
  clearChartViewEngineCache();
  const raman = chartViewEngineCacheKey(baseKey);
  const lahiri = chartViewEngineCacheKey({ ...baseKey, ayanamsa: "lahiri" });
  const trueNode = chartViewEngineCacheKey({ ...baseKey, nodeMode: "true" });
  assert.notEqual(raman, lahiri);
  assert.notEqual(raman, trueNode);
  writeChartViewEngineCache(raman, { success: true }, 1_000);
  assert.deepEqual(readChartViewEngineCache(raman, 1_000), { success: true });
  assert.equal(readChartViewEngineCache(raman, 1_000 + CHART_VIEW_ENGINE_CACHE_TTL_MS + 1), null);
  assert.equal(CHART_VIEW_ENGINE_TIMEOUT_MS, 10_000);
});

test("layer query parsing keeps only known layers in stable order", () => {
  assert.deepEqual(parseChartViewLayers(null), []);
  assert.deepEqual(parseChartViewLayers("western,varga,nope,qizheng"), ["varga", "western", "qizheng"]);
});