// src/api.js
// 프론트와 API가 동일 도메인(nginx 프록시)이므로 항상 상대 경로 사용.
// 절대 URL(VITE_API_BASE)은 Mixed Content를 유발하므로 사용하지 않음.
const toApiUrl = (path) => path;

export async function apiGet(path) {
  const res = await fetch(toApiUrl(path), {
    headers: { "Accept": "application/json" },
  });
  if (!res.ok) {
    const text = await res.text().catch(() => "");
    throw new Error(`HTTP ${res.status} ${res.statusText}: ${text}`);
  }
  return res.json();
}

export async function apiDelete(path) {
  const res = await fetch(toApiUrl(path), { method: "DELETE" });
  if (!res.ok) {
    const text = await res.text().catch(() => "");
    throw new Error(`HTTP ${res.status} ${res.statusText}: ${text}`);
  }
  return res.json();
}

export async function apiPost(path, body) {
  const res = await fetch(toApiUrl(path), {
    method: "POST",
    headers: {
      "Accept": "application/json",
      ...(body ? { "Content-Type": "application/json" } : {}),
    },
    body: body ? JSON.stringify(body) : undefined,
  });
  if (!res.ok) {
    const text = await res.text().catch(() => "");
    throw new Error(`HTTP ${res.status} ${res.statusText}: ${text}`);
  }
  return res.json();
}

export async function apiPut(path, body) {
  const res = await fetch(toApiUrl(path), {
    method: "PUT",
    headers: {
      "Accept": "application/json",
      ...(body ? { "Content-Type": "application/json" } : {}),
    },
    body: body ? JSON.stringify(body) : undefined,
  });
  if (!res.ok) {
    const text = await res.text().catch(() => "");
    throw new Error(`HTTP ${res.status} ${res.statusText}: ${text}`);
  }
  return res.json();
}

export function getLatest() {
  return apiGet("/api/lotto/latest");
}

export function getStats() {
  return apiGet("/api/lotto/stats");
}

export function recommend(params) {
  const qs = new URLSearchParams({
    recent_window: String(params.recent_window),
    recent_weight: String(params.recent_weight),
    avoid_recent_k: String(params.avoid_recent_k),
  });
  return apiGet(`/api/lotto/recommend?${qs.toString()}`);
}

export function getHistory(limit = 30, offset = 0) {
  return apiGet(`/api/history?limit=${limit}&offset=${offset}`);
}

export function deleteHistory(id) {
  return apiDelete(`/api/history/${id}`);
}

// ── 시뮬레이션 관련 API ──────────────────────────────────────────────────────

export function getBestPicks(limit = 20) {
  return apiGet(`/api/lotto/best?limit=${limit}`);
}

export function getAnalysis() {
  return apiGet('/api/lotto/analysis');
}

export function triggerSimulate(nCandidates = 20000, topK = 100, bestN = 20) {
  const qs = new URLSearchParams({
    n_candidates: String(nCandidates),
    top_k: String(topK),
    best_n: String(bestN),
  });
  return apiPost(`/api/admin/simulate?${qs.toString()}`);
}

export function getStockNews(limit = 20, category) {
  const qs = new URLSearchParams({ limit: String(limit) });
  if (category) {
    qs.set("category", category);
  }
  return apiGet(`/api/stock/news?${qs.toString()}`);
}

export function getStockIndices() {
  return apiGet("/api/stock/indices");
}

export function getTradeBalance() {
  return apiGet("/api/trade/balance");
}

export function createTradeOrder(payload) {
  return apiPost("/api/trade/order", payload);
}

// ── 포트폴리오 (수동 입력) API ──────────────────────────────────────────────

export function getPortfolio() {
  return apiGet("/api/portfolio");
}

export function addPortfolio(item) {
  return apiPost("/api/portfolio", item);
}

export function updatePortfolio(id, fields) {
  return apiPut(`/api/portfolio/${id}`, fields);
}

export function deletePortfolio(id) {
  return apiDelete(`/api/portfolio/${id}`);
}

// ── 예수금 API ───────────────────────────────────────────────────────────────

export function upsertCash(broker, cash) {
  return apiPut('/api/portfolio/cash', { broker, cash });
}

export function deleteCash(broker) {
  return apiDelete(`/api/portfolio/cash/${encodeURIComponent(broker)}`);
}

// ── 시장 심리 지표 API ────────────────────────────────────────────────────────

// CNN Fear & Greed Index (개발: vite proxy /ext/feargreed, 프로덕션: nginx proxy 필요)
export async function getFearAndGreed() {
  const res = await fetch('/ext/feargreed', { headers: { Accept: 'application/json' } });
  if (!res.ok) throw new Error(`HTTP ${res.status}`);
  return res.json();
}

// VIX 지수 (Yahoo Finance 공개 API)
export async function getVix() {
  const res = await fetch('/ext/vix', { headers: { Accept: 'application/json' } });
  if (!res.ok) throw new Error(`HTTP ${res.status}`);
  const data = await res.json();
  const price = data?.chart?.result?.[0]?.meta?.regularMarketPrice;
  if (price === undefined || price === null) throw new Error('VIX 데이터 없음');
  return { value: Math.round(price * 100) / 100 };
}

// ── TODO API ─────────────────────────────────────────────────────────────────

export function getTodos() {
  return apiGet('/api/todos');
}

export function addTodo(data) {
  return apiPost('/api/todos', data);
}

export function updateTodo(id, data) {
  return apiPut(`/api/todos/${id}`, data);
}

export function deleteTodo(id) {
  return apiDelete(`/api/todos/${id}`);
}

export function clearTodos() {
  return apiDelete('/api/todos/done');
}