export const METRIC_REPORTS_LIST_PATH = "/metric-reports";

export function metricReportDetailPath(metricViewId) {
  if (!metricViewId) return METRIC_REPORTS_LIST_PATH;
  return `${METRIC_REPORTS_LIST_PATH}/${encodeURIComponent(metricViewId)}`;
}

export function parseMetricViewIdFromReportUrl(reportViewUrl) {
  if (!reportViewUrl || typeof reportViewUrl !== "string") return null;
  try {
    const u = new URL(
      reportViewUrl.startsWith("http")
        ? reportViewUrl
        : `https://placeholder.local${reportViewUrl.startsWith("/") ? "" : "/"}${reportViewUrl}`
    );
    return u.searchParams.get("id");
  } catch {
    const m = String(reportViewUrl).match(/[?&]id=([^&]+)/);
    return m ? decodeURIComponent(m[1]) : null;
  }
}

function extractMetricsArray(payload) {
  if (!payload || typeof payload !== "object") return null;
  if (Array.isArray(payload)) return payload;
  if (Array.isArray(payload.metrics)) return payload.metrics;
  if (Array.isArray(payload.items)) return payload.items;
  if (Array.isArray(payload.reports)) return payload.reports;
  if (Array.isArray(payload.list)) return payload.list;
  return null;
}

/** Normalize GET metric/metric_report/list response to an array of items. */
export function parseMetricReportListResponse(apiResponse) {
  if (!apiResponse) return [];

  const root = apiResponse;
  const isSuccess =
    root?.status === "success" ||
    root?.statusCode === 200 ||
    root?.statusCode === "200";

  if (isSuccess && root.data != null) {
    const fromData = extractMetricsArray(root.data);
    if (fromData) return fromData;
  }

  const fromRoot = extractMetricsArray(root);
  if (fromRoot) return fromRoot;

  if (root?.data != null && typeof root.data === "object") {
    const fromNested = extractMetricsArray(root.data);
    if (fromNested) return fromNested;
  }

  return [];
}

/** Value-tab graph shape from a list API metric object. */
export function listItemToValueGraph(item) {
  if (!item || typeof item !== "object") return null;
  return {
    name: item.name ?? item.label ?? "Value",
    value: item.value,
    values: Array.isArray(item.values) ? item.values : [],
  };
}

export function getMetricReportItemId(item) {
  if (!item || typeof item !== "object") return null;
  return (
    item.id ??
    item.metric_view_id ??
    item.metricViewId ??
    parseMetricViewIdFromReportUrl(item.report_view_url)
  );
}

export function getMetricReportItemTitle(item) {
  if (!item || typeof item !== "object") return "Metric";
  return String(
    item.name ?? item.title ?? item.value_title ?? item.label ?? "Metric"
  ).trim();
}

export function getMetricReportDefaultTab(item) {
  const aggType = String(item?.agg_type || "").toLowerCase();
  if (aggType === "team") return "Detail";
  if (aggType === "individual") return "Trend";
  return "Detail";
}

export function getMetricReportCurrentPeriod(item) {
  const period = item?.current_period;
  if (period == null || String(period).trim() === "") return null;
  return String(period).trim();
}

/** Human-readable label for list-card agg_type badge (e.g. team → Team). */
export function formatMetricReportAggTypeLabel(aggType) {
  const raw = String(aggType || "").trim();
  if (!raw) return null;
  return raw.charAt(0).toUpperCase() + raw.slice(1).toLowerCase();
}