import { chartViewResponseSchema, type ChartViewResponse } from "./chart-view-contract.ts";
import type { ChartViewLayer } from "./chart-view-engine.ts";

export async function fetchChartView(input: {
  layers?: readonly ChartViewLayer[];
  signal?: AbortSignal;
}): Promise<{ httpStatus: number; body: ChartViewResponse | null }> {
  const query = input.layers?.length ? `?layers=${input.layers.join(",")}` : "";
  const response = await fetch(`/api/chart-view${query}`, {
    credentials: "same-origin",
    headers: { Accept: "application/json" },
    cache: "no-store",
    signal: input.signal,
  });
  let json: unknown = null;
  try {
    json = await response.json();
  } catch (error) {
    const errorName = error instanceof Error ? error.name : "Error";
    console.warn("chart_view_client_bad_payload", { errorName, httpStatus: response.status });
    return { httpStatus: response.status, body: null };
  }
  const parsed = chartViewResponseSchema.safeParse(json);
  return { httpStatus: response.status, body: parsed.success ? parsed.data : null };
}