// ===================================
// Supabase 設定
// ===================================
const SUPABASE_URL = "https://ogtlmtnjkpsxsqzqlacj.supabase.co";
const SUPABASE_KEY = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZSIsInJlZiI6Im9ndGxtdG5qa3BzeHNxenFsYWNqIiwicm9sZSI6ImFub24iLCJpYXQiOjE3NjMyOTU3NjUsImV4cCI6MjA3ODg3MTc2NX0.JnCE7oUQwrSgGqiu-QRbwnaLBZrO8JX1_RUb37VIMFI";
const supa = window.supabase.createClient(SUPABASE_URL, SUPABASE_KEY);
// ===================================
// デバイスID（ブラウザごとに固定）
// ===================================
let deviceId = localStorage.getItem("deviceId");
if (!deviceId) {
  deviceId = crypto.randomUUID();
  localStorage.setItem("deviceId", deviceId);
}

// ===================================
// 変数
// ===================================
let currentGroup = "";
let currentUser = "";
let map;
let selfMarker = null;
let otherMarkers = [];
let latestByDevice = {};
let lastLat = null;
let lastLng = null;

// 駅関連
let stationMarkers = [];

// 目的地共有関連
let targetMarker = null;
let targetLat = null;
let targetLng = null;
let arrived = false;

// デフォルト（皇居）
const DEFAULT_LAT = 35.681236;
const DEFAULT_LNG = 139.767125;

// ===================================
// 各種アイコン
// ===================================
const stationIcon = L.icon({
  iconUrl: "https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-blue.png",
  shadowUrl: "https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.7.1/images/marker-shadow.png",
  iconSize: [25, 41],
  iconAnchor: [12, 41]
});

const targetIcon = L.icon({
  iconUrl: "https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-red.png",
  shadowUrl: "https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.7.1/images/marker-shadow.png",
  iconSize: [25, 41],
  iconAnchor: [12, 41]
});

// ===================================
// パラメータ読込
// ===================================
function loadParams() {
  const p = new URLSearchParams(location.search);
  currentGroup = p.get("group");
  currentUser = p.get("user");
  document.getElementById("groupName").textContent = currentGroup;
  document.getElementById("userName").textContent = currentUser;
}

// ===================================
// 小型ピン
// ===================================
function createLabeledMarker(lat, lng, name, isSelf) {
  const pinUrl = isSelf
    ? "https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-green.png"
    : "https://raw.githubusercontent.com/pointhi/leaflet-color-markers/master/img/marker-icon-gold.png";

  const html = `
    <div class="pin-wrapper">
      <img src="${pinUrl}" class="pin-img">
      <div class="pin-label">${name}</div>
    </div>
  `;

  return L.marker([lat, lng], {
    icon: L.divIcon({
      className: "custom-pin",
      html: html,
      iconSize: [32, 32],
      iconAnchor: [16, 32]
    })
  });
}

// ===================================
function getPosition() {
  return new Promise((res, rej) => {
    navigator.geolocation.getCurrentPosition(
      pos => res(pos.coords),
      rej,
      { enableHighAccuracy: true }
    );
  });
}

// ===================================
// マップ初期化
// ===================================
function initMap(lat, lng) {
  map = L.map("map").setView([lat, lng], 16);

  L.tileLayer("https://tile.openstreetmap.org/{z}/{x}/{y}.png", {
    maxZoom: 19
  }).addTo(map);

  // ★ 目的地クリック設定（保存付き）
  map.on("click", async (e) => {
    targetLat = e.latlng.lat;
    targetLng = e.latlng.lng;
    arrived = false;

    if (targetMarker) map.removeLayer(targetMarker);

    targetMarker = L.marker([targetLat, targetLng], { icon: targetIcon }).addTo(map);

    const box = document.getElementById("targetInfo");
    box.textContent = "目的地を設定しました！（共有中…）";

    // Supabase 保存（グループごとに目的地1つ）
    await supa.from("shared_target").upsert({
      group_name: currentGroup,
      lat: targetLat,
      lng: targetLng
    });

    box.textContent = "目的地をグループに共有しました！";
  });
}

// ===================================
// 自分の位置保存
// ===================================
async function saveMyLocation(lat, lng) {
  await supa
    .from("locations")
    .delete()
    .eq("group_name", currentGroup)
    .eq("device_id", deviceId);

  await supa.from("locations").insert({
    group_name: currentGroup,
    user_name: currentUser,
    device_id: deviceId,
    lat: lat,
    lng: lng
  });
}

// ===================================
function renderSelfMarker() {
  if (selfMarker) map.removeLayer(selfMarker);

  selfMarker = createLabeledMarker(lastLat, lastLng, currentUser, true);
  selfMarker.addTo(map);
}

// ===================================
// メンバー一覧
// ===================================
function showMemberList(latestByDevice) {
  const list = document.getElementById("memberList");
  list.innerHTML = "";

  Object.values(latestByDevice).forEach((row) => {
    const li = document.createElement("li");
    const diff = (Date.now() - new Date(row.updated_at)) / 1000;
    const isOnline = diff < 6;

    li.classList.add(isOnline ? "online" : "offline");

    const color = row.device_id === deviceId ? "#58c16b" : "#FFD700";
    const icon = document.createElement("div");
    icon.className = "member-icon";
    icon.style.background = color;

    const name = document.createElement("span");
    name.textContent = row.user_name;

    const status = document.createElement("span");
    status.className = "status-text";
    status.textContent = isOnline ? "🟢オンライン" : "🔴オフライン";

    li.append(icon, name, status);
    list.appendChild(li);
  });
}

// ===================================
// 他ユーザー取得
// ===================================
async function showOtherUsers() {
  const { data } = await supa
    .from("locations")
    .select("*")
    .eq("group_name", currentGroup)
    .order("updated_at", { ascending: false });

  latestByDevice = {};
  data?.forEach((r) => {
    if (!latestByDevice[r.device_id]) latestByDevice[r.device_id] = r;
  });

  showMemberList(latestByDevice);

  otherMarkers.forEach(m => map.removeLayer(m));
  otherMarkers = [];

  Object.values(latestByDevice).forEach((row) => {
    if (row.device_id === deviceId) return;

    const mk = createLabeledMarker(row.lat, row.lng, row.user_name, false);
    mk.addTo(map);
    otherMarkers.push(mk);
  });
}

// ===================================
// 距離
// ===================================
function distanceMeters(lat1, lng1, lat2, lng2) {
  const R = 6371000;
  const toRad = (d) => d * Math.PI / 180;

  const dLat = toRad(lat2 - lat1);
  const dLng = toRad(lng2 - lng1);

  const a =
    Math.sin(dLat / 2) ** 2 +
    Math.cos(toRad(lat1)) *
    Math.cos(toRad(lat2)) *
    Math.sin(dLng / 2) ** 2;

  return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
}

// ===================================
// 到着判定
// ===================================
function checkArrival() {
  if (!targetLat || !targetLng) return;

  const d = distanceMeters(lastLat, lastLng, targetLat, targetLng);
  const box = document.getElementById("targetInfo");

  box.textContent = "目的地まで 約 " + (d / 1000).toFixed(2) + " km";

  if (d < 120 && !arrived) {
    arrived = true;
    box.textContent = "🎉 目的地に到着しました！ 🎉";
    box.style.background = "#ffe4e1";
    box.style.borderLeft = "5px solid #ff4d6d";

    if (navigator.vibrate) navigator.vibrate([200, 100, 200]);
  }
}

// ===================================
// 駅取得（Overpass API）
// ===================================
async function fetchStationsAround(lat, lng) {
  const query = `
    [out:json];
    node["railway"="station"](around:5000,${lat},${lng});
    out;
  `;

  const url = "https://overpass-api.de/api/interpreter?data=" + encodeURIComponent(query);
  const res = await fetch(url);
  const json = await res.json();
  return json.elements || [];
}

// ===================================
async function loadStations() {
  const box = document.getElementById("nearestBox");

  try {
    const stations = await fetchStationsAround(lastLat, lastLng);

    stationMarkers.forEach(m => map.removeLayer(m));
    stationMarkers = [];

    if (stations.length === 0) {
      box.textContent = "駅が見つかりませんでした。";
      return;
    }

    let nearest = null;
    let nearestDist = Infinity;

    stations.forEach(st => {
      const sLat = st.lat;
      const sLng = st.lon;
      const name = st.tags?.name || "駅名不明";

      const d = distanceMeters(lastLat, lastLng, sLat, sLng);
      if (d < nearestDist) {
        nearest = { name: name, lat: sLat, lng: sLng };
        nearestDist = d;
      }

      const mk = L.marker([sLat, sLng], { icon: stationIcon }).addTo(map);
      mk.bindPopup(name + "駅");
      stationMarkers.push(mk);
    });

    box.textContent = "最寄り駅：" + nearest.name + "（約 " + (nearestDist / 1000).toFixed(2) + " km）";

  } catch {
    box.textContent = "駅情報を取得できませんでした。";
  }
}

// ===================================
// ★ 共有目的地の読込
// ===================================
async function loadSharedTarget() {
  const { data } = await supa
    .from("shared_target")
    .select("*")
    .eq("group_name", currentGroup)
    .maybeSingle();

  if (!data || !data.lat || !data.lng) return;

  // ピン表示更新
  if (targetMarker) map.removeLayer(targetMarker);

  targetLat = data.lat;
  targetLng = data.lng;
  arrived = false;

  targetMarker = L.marker([targetLat, targetLng], { icon: targetIcon }).addTo(map);

  const box = document.getElementById("targetInfo");
  box.textContent = "共有された目的地を読み込みました。距離計算中…";
}

// ===================================
// main
// ===================================
async function main() {
  loadParams();
// ホスト判定
　const p = new URLSearchParams(location.search);
　const isHost = p.get("host") === "1";

　document.getElementById("hostStatus").textContent = 
 　 isHost ? "あなたはホストです" : "一般メンバーです";

  let lat = DEFAULT_LAT;
  let lng = DEFAULT_LNG;

  try {
    const pos = await getPosition();
    lat = pos.latitude;
    lng = pos.longitude;
  } catch {}

  lastLat = lat;
  lastLng = lng;

  initMap(lat, lng);
  renderSelfMarker();
  await saveMyLocation(lat, lng);
  await showOtherUsers();

  loadStations();

  // 現在地更新
  setInterval(async () => {
    try {
      const pos = await getPosition();
      lastLat = pos.latitude;
      lastLng = pos.longitude;

      renderSelfMarker();
      await saveMyLocation(lastLat, lastLng);

      checkArrival();
    } catch {}
  }, 2000);

  // 他ユーザー
  setInterval(showOtherUsers, 1000);

  // ★共有目的地
  setInterval(loadSharedTarget, 1000);

  document.getElementById("exitBtn").onclick = () => {
    location.href = "index.html";
  };

  setTimeout(() => map.invalidateSize(), 300);
}

window.addEventListener("DOMContentLoaded", main);