import { SpanStatusCode, trace } from "@opentelemetry/api";
import { currentAccessToken } from "../auth/oidc";
import type {
  AWKpi,
  AWHistoryPoint,
  AWForecastPoint,
  AWRepScore,
  AWProductDemand,
  AWAnomalyPoint,
} from "./types";

const API_BASE = import.meta.env.VITE_API_BASE_URL ?? "http://localhost:8000";
const tracer = trace.getTracer("aw-frontend-api");

async function get<T>(path: string, spanName: string): Promise<T> {
  return tracer.startActiveSpan(spanName, async (span) => {
    try {
      const token = currentAccessToken();
      const resp = await fetch(`${API_BASE}${path}`, {
        headers: {
          Accept: "application/json",
          ...(token ? { Authorization: `Bearer ${token}` } : {}),
        },
      });
      if (!resp.ok) {
        const body = await resp.text();
        throw new Error(`HTTP ${resp.status}: ${body}`);
      }
      span.setAttribute("http.status_code", resp.status);
      span.setStatus({ code: SpanStatusCode.OK });
      return (await resp.json()) as T;
    } catch (err) {
      span.recordException(err as Error);
      span.setStatus({ code: SpanStatusCode.ERROR, message: String(err) });
      throw err;
    } finally {
      span.end();
    }
  });
}

export const getAWKpis = () =>
  get<AWKpi>("/api/aw/sales/kpis", "frontend.aw.sales_kpis");

export const getAWSalesHistory = (daysBack = 365) =>
  get<AWHistoryPoint[]>(
    `/api/aw/sales/history?days_back=${daysBack}`,
    "frontend.aw.sales_history",
  );

export const getAWSalesForecast = (horizonDays = 30) =>
  get<AWForecastPoint[]>(
    `/api/aw/sales/forecast?horizon_days=${horizonDays}`,
    "frontend.aw.sales_forecast",
  );

export const getAWRepScores = (topN = 10) =>
  get<AWRepScore[]>(
    `/api/aw/reps/scores?top_n=${topN}`,
    "frontend.aw.rep_scores",
  );

export const getAWProductDemand = (topN = 20) =>
  get<AWProductDemand[]>(
    `/api/aw/products/demand?top_n=${topN}`,
    "frontend.aw.product_demand",
  );

export const getAWAnomalies = () =>
  get<AWAnomalyPoint[]>("/api/aw/anomalies", "frontend.aw.anomalies");