/**
 * api.js — Connect your React app to Finmih backend
 *
 * LOCAL dev:  set VITE_API_URL=http://localhost:8000  in frontend/.env
 * Production: set VITE_API_URL=https://YOUR_HF_USERNAME-finmih-api.hf.space
 */

const BASE = import.meta.env.VITE_API_URL || "http://localhost:8000";

const getToken = () => localStorage.getItem("token");

async function req(path, options = {}) {
  const token = getToken();
  const res = await fetch(`${BASE}${path}`, {
    ...options,
    headers: {
      "Content-Type": "application/json",
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
      ...options.headers,
    },
  });
  if (res.status === 401) {
    localStorage.removeItem("token");
    window.location.href = "/login";
  }
  const data = await res.json();
  if (!res.ok) throw new Error(data.detail || "API error");
  return data;
}

// ── Auth ──────────────────────────────────────────────────────────────────────
export const register = (name, email, password, income, currency = "PKR") =>
  req("/api/auth/register", { method: "POST", body: JSON.stringify({ name, email, password, income, currency }) });

export const login = (email, password) =>
  req("/api/auth/login", { method: "POST", body: JSON.stringify({ email, password }) });

export const getMe = () => req("/api/auth/me");

// ── Expenses ──────────────────────────────────────────────────────────────────
export const getExpenses   = ()       => req("/api/expenses/");
export const getExpenseSummary = ()   => req("/api/expenses/summary");
export const addExpense    = (data)   => req("/api/expenses/", { method: "POST", body: JSON.stringify(data) });
export const deleteExpense = (id)     => req(`/api/expenses/${id}`, { method: "DELETE" });

// ── Debt ──────────────────────────────────────────────────────────────────────
export const getDebts      = ()       => req("/api/debt/");
export const getDebtAnalysis = ()     => req("/api/debt/analysis");
export const addDebt       = (data)   => req("/api/debt/", { method: "POST", body: JSON.stringify(data) });
export const deleteDebt    = (id)     => req(`/api/debt/${id}`, { method: "DELETE" });

// ── Goals ─────────────────────────────────────────────────────────────────────
export const getGoals      = ()       => req("/api/goals/");
export const addGoal       = (data)   => req("/api/goals/", { method: "POST", body: JSON.stringify(data) });
export const contributeGoal= (id, amt)=> req(`/api/goals/${id}/contribute?amount=${amt}`, { method: "PUT" });
export const deleteGoal    = (id)     => req(`/api/goals/${id}`, { method: "DELETE" });

// ── AI Advisor ────────────────────────────────────────────────────────────────
export const chat = (message, history = []) =>
  req("/api/advisor/chat", { method: "POST", body: JSON.stringify({ message, history }) });

// ── Growth Predictor ──────────────────────────────────────────────────────────
export const predictGrowth = (initial_amount, monthly_saving, annual_rate, years) =>
  req("/api/predictor/growth", { method: "POST", body: JSON.stringify({ initial_amount, monthly_saving, annual_rate, years }) });