// Headless guard for the trace-chart viewer's x-mode + interaction wiring.
// Properties: (1) the DEFAULT x spine is ORDINAL — data[0] is [0..n-1], not the raw
// timestamps, so non-trading gaps collapse; the x-axis carries an index->label values
// formatter. (2) "continuous" mode restores data[0] === xs verbatim. (3) panels carry a
// shared cursor.sync.key so the crosshair lines up. (4) every config attaches an
// interaction plugin with an init hook. Drives the pure buildCharts; no DOM/uPlot.
import { createRequire } from "node:module";
import { readFileSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { dirname, join } from "node:path";

const require = createRequire(import.meta.url);
const here = dirname(fileURLToPath(import.meta.url));
const traces = JSON.parse(readFileSync(join(here, "fixtures", "sample-traces.json"), "utf8"));

const fail = (msg) => { console.error("FAIL: " + msg); process.exit(1); };
const sameArr = (a, b, msg) => {
  if (!Array.isArray(a) || !Array.isArray(b) || a.length !== b.length || a.some((v, i) => v !== b[i])) fail(msg);
};

global.window = { AURA_TRACES: traces };
const { buildCharts } = require(join(here, "..", "assets", "chart-viewer.js"));

const n = traces.xs.length;
const idx = Array.from({ length: n }, (_, i) => i);

// (1) default is ordinal: data[0] is the index spine, with an x-axis values formatter.
const ov = buildCharts(traces, "overlay");
sameArr(ov[0].data[0], idx, "default overlay x is the ordinal index spine [0..n-1]");
if (typeof ov[0].opts.axes[0].values !== "function") fail("ordinal overlay x-axis lacks a values formatter");

// (4) interaction wired: a plugin with an init hook.
if (!Array.isArray(ov[0].opts.plugins) || ov[0].opts.plugins.length < 1) fail("no interaction plugin attached");
if (typeof ov[0].opts.plugins[0].hooks.init !== "function") fail("interaction plugin has no init hook");

// (2) continuous mode: data[0] is xs verbatim.
const ovc = buildCharts(traces, "overlay", "continuous");
sameArr(ovc[0].data[0], traces.xs, "continuous overlay x is xs verbatim");

// (3) panels: cursor.sync.key present and equal across panels; default still ordinal.
const panels = buildCharts(traces, "panels");
const keys = panels.map((p) => p.opts.cursor && p.opts.cursor.sync && p.opts.cursor.sync.key);
if (keys.some((k) => !k)) fail("a panel lacks cursor.sync.key");
if (new Set(keys).size !== 1) fail("panels do not share one cursor.sync key");
sameArr(panels[0].data[0], idx, "default panel x is the ordinal index spine");

console.log("OK — ordinal default + continuous toggle + panel cursor-sync + interaction plugin.");
process.exit(0);