let map, poleLayer, connectionLayer, tileLayer;
let poles = [];
let poleCounter = 1;
let currentPoleType = "1";
let currentPoleStatus = "projected";
let currentExistingType = "communication";
let history = [];
let historyIndex = -1;

const POLE_TYPES = {
  "1": { name: "Промежуточная", color: "#2563eb", icon: "●" },
  "2": { name: "Угловая", color: "#dc2626", icon: "◆" },
  "3": { name: "С муфтой", color: "#ca8a04", icon: "◎" },
  "4": { name: "С ОРКсп", color: "#16a34a", icon: "◇" },
  "5": { name: "С муфтой и ОРКсп", color: "#7c3aed", icon: "★" },
};

const TILE_PROVIDERS = {
  street: { name: "Схема", url: "https://a.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png", attr: "&copy; <a href='https://carto.com'>CARTO</a>" },
  satellite: { name: "Спутник", url: "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}", attr: "&copy; Esri" },
};

function initApp() {
  initMap();
  initSelectors();
  initPoleControls();
  updateTable();
  updateUndoButtons();
}

function initMap() {
  map = L.map("map", { zoomControl: true }).setView([48.0, 68.0], 6);
  tileLayer = L.tileLayer(TILE_PROVIDERS.street.url, { attribution: TILE_PROVIDERS.street.attr, maxZoom: 19 }).addTo(map);

  poleLayer = L.featureGroup().addTo(map);
  connectionLayer = L.featureGroup().addTo(map);

  map.on("click", function (e) {
    saveHistory();
    addPole(e.latlng.lat, e.latlng.lng);
  });

  document.querySelectorAll(".map-mode-btn").forEach((btn) => {
    btn.addEventListener("click", function () {
      document.querySelectorAll(".map-mode-btn").forEach((b) => b.classList.remove("active"));
      this.classList.add("active");
      const mode = this.dataset.mode;
      const provider = TILE_PROVIDERS[mode];
      tileLayer.setUrl(provider.url);
      tileLayer.setAttribution(provider.attr);
    });
  });
}

function saveHistory() {
  const snapshot = poles.map((p) => ({ ...p }));
  if (historyIndex < history.length - 1) {
    history = history.slice(0, historyIndex + 1);
  }
  history.push(snapshot);
  historyIndex = history.length - 1;
}

function undo() {
  if (historyIndex < 0) return;
  historyIndex--;
  restoreHistory();
}

function redo() {
  if (historyIndex >= history.length - 1) return;
  historyIndex++;
  restoreHistory();
}

function restoreHistory() {
  if (historyIndex < 0 || historyIndex >= history.length) {
    poles = [];
  } else {
    poles = history[historyIndex].map((p) => ({ ...p }));
  }
  poleCounter = poles.length > 0 ? Math.max(...poles.map((p) => p.id)) + 1 : 1;
  poleLayer.clearLayers();
  connectionLayer.clearLayers();
  poles.forEach((p) => renderPole(p));
  updateTable();
  updateConnections();
  updateUndoButtons();
}

function updateUndoButtons() {
  document.getElementById("undoBtn").style.opacity = historyIndex >= 0 ? "1" : "0.3";
  document.getElementById("redoBtn").style.opacity = historyIndex < history.length - 1 ? "1" : "0.3";
}

function initSelectors() {
  const oblastSel = document.getElementById("oblast");
  const rayonSel = document.getElementById("rayon");
  const villageSel = document.getElementById("village");
  const searchInput = document.getElementById("searchInput");
  const manualVillage = document.getElementById("manualVillage");

  KZ_DATA.forEach((o) => {
    const opt = document.createElement("option");
    opt.value = o.oblast;
    opt.textContent = o.oblast;
    oblastSel.appendChild(opt);
  });

  function updateRayons() {
    rayonSel.innerHTML = '<option value="">— Выберите район —</option>';
    villageSel.innerHTML = '<option value="">— Выберите село —</option>';
    const oblast = KZ_DATA.find((o) => o.oblast === oblastSel.value);
    if (!oblast) return;
    oblast.rayons.forEach((r) => {
      const opt = document.createElement("option");
      opt.value = r.rayon;
      opt.textContent = `${r.rayon} (${r.villages.length} сёл)`;
      rayonSel.appendChild(opt);
    });
  }

  function updateVillages() {
    villageSel.innerHTML = '<option value="">— Выберите село —</option>';
    const oblast = KZ_DATA.find((o) => o.oblast === oblastSel.value);
    if (!oblast) return;
    const rayon = oblast.rayons.find((r) => r.rayon === rayonSel.value);
    if (!rayon) return;
    rayon.villages.forEach((v) => {
      const opt = document.createElement("option");
      opt.value = v;
      opt.textContent = v;
      villageSel.appendChild(opt);
    });
  }

  oblastSel.addEventListener("change", function() {
    updateRayons();
    const oblast = KZ_DATA.find((o) => o.oblast === this.value);
    if (oblast) map.setView(oblast.center, 8);
  });
  rayonSel.addEventListener("change", function() {
    updateVillages();
    const oblast = KZ_DATA.find((o) => o.oblast === oblastSel.value);
    if (!oblast) return;
    const rayon = oblast.rayons.find((r) => r.rayon === this.value);
    const center = (rayon && rayon.center) ? rayon.center : (oblast ? oblast.center : null);
    if (center) map.setView(center, 10);
  });

  function goToVillage(name) {
    if (!name) return;
    const oblast = KZ_DATA.find((o) => o.oblast === oblastSel.value);
    if (!oblast) return;
    const rayon = oblast.rayons.find((r) => r.rayon === rayonSel.value);
    const center = (rayon && rayon.center) ? rayon.center : oblast.center;
    map.setView(center, 12);
    L.popup()
      .setLatLng(center)
      .setContent(`<b>${name}</b><br>${oblast.oblast}, ${rayon ? rayon.rayon : ''}`)
      .openOn(map);
  }

  villageSel.addEventListener("change", function () {
    goToVillage(this.value);
  });

  manualVillage.addEventListener("keydown", function (e) {
    if (e.key === "Enter" && this.value.trim()) {
      goToVillage(this.value.trim());
    }
  });
  manualVillage.addEventListener("blur", function () {
    if (this.value.trim()) {
      goToVillage(this.value.trim());
    }
  });

  searchInput.addEventListener("input", function () {
    const q = this.value.toLowerCase().trim();
    const list = document.getElementById("searchResults");
    list.innerHTML = "";
    if (q.length < 2) return;
    const results = [];
    KZ_DATA.forEach((o) => {
      o.rayons.forEach((r) => {
        r.villages.forEach((v) => {
          if (v.toLowerCase().includes(q)) {
            results.push({ village: v, rayon: r.rayon, oblast: o.oblast, center: r.center || o.center });
          }
        });
      });
    });
    if (results.length === 0) {
      list.innerHTML = "<li class='px-3 py-2 text-gray-500'>Не найдено</li>";
      return;
    }
    results.slice(0, 30).forEach((r) => {
      const li = document.createElement("li");
      li.className = "px-3 py-2 cursor-pointer hover:bg-cyan-50";
      li.textContent = `${r.village} — ${r.rayon}, ${r.oblast}`;
      li.addEventListener("click", () => {
        oblastSel.value = r.oblast;
        updateRayons();
        rayonSel.value = r.rayon;
        updateVillages();
        villageSel.value = r.village;
        map.setView(r.center, 12);
        L.popup()
          .setLatLng(r.center)
          .setContent(`<b>${r.village}</b><br>${r.oblast}, ${r.rayon}`)
          .openOn(map);
        list.innerHTML = "";
        searchInput.value = r.village;
      });
      list.appendChild(li);
    });
  });

  document.addEventListener("click", function (e) {
    if (!e.target.closest("#searchResults") && !e.target.closest("#searchInput")) {
      document.getElementById("searchResults").innerHTML = "";
    }
  });
}

function initPoleControls() {
  document.querySelectorAll(".pole-type-btn").forEach((btn) => {
    btn.addEventListener("click", function () {
      document.querySelectorAll(".pole-type-btn").forEach((b) => b.classList.remove("active"));
      this.classList.add("active");
      currentPoleType = this.dataset.type;
    });
  });
  document.querySelector('[data-type="1"]').classList.add("active");

  document.querySelectorAll(".pole-status-btn").forEach((btn) => {
    btn.addEventListener("click", function () {
      document.querySelectorAll(".pole-status-btn").forEach((b) => b.classList.remove("active"));
      this.classList.add("active");
      currentPoleStatus = this.dataset.status;
      const existingTypeSel = document.getElementById("existingTypeGroup");
      existingTypeSel.style.display = currentPoleStatus === "existing" ? "block" : "none";
    });
  });

  document.querySelectorAll(".existing-type-btn").forEach((btn) => {
    btn.addEventListener("click", function () {
      document.querySelectorAll(".existing-type-btn").forEach((b) => b.classList.remove("active"));
      this.classList.add("active");
      currentExistingType = this.dataset.existing;
    });
  });
  document.querySelector('[data-status="projected"]').classList.add("active");
}

const EXISTING_TYPES = {
  communication: "опора связи",
  power: "ЛЭП",
  lighting: "освещения",
};

function addPole(lat, lng) {
  const type = POLE_TYPES[currentPoleType];
  const id = poleCounter++;
  const pole = { id, lat, lng, type: currentPoleType, status: currentPoleStatus, existingType: currentExistingType, label: `Опора ${id}` };
  poles.push(pole);
  renderPole(pole);
  updateTable();
  updateConnections();
  updateUndoButtons();
}

function renderPole(pole) {
  const type = POLE_TYPES[pole.type];
  const icon = L.divIcon({
    className: "pole-marker",
    html: `<div style="
      width:28px;height:28px;border-radius:50%;
      background:${type.color};color:#fff;
      display:flex;align-items:center;justify-content:center;
      font-size:14px;font-weight:700;border:2px solid #fff;
      box-shadow:0 2px 6px rgba(0,0,0,.3);
      cursor:pointer;
    " title="${pole.label} (${type.name})">${pole.id}</div>`,
    iconSize: [28, 28],
    iconAnchor: [14, 14],
  });

  const marker = L.marker([pole.lat, pole.lng], { icon }).addTo(poleLayer);
  const statusLabel = pole.status === "existing" ? `Существующая (${EXISTING_TYPES[pole.existingType] || pole.existingType})` : "Проектируемая";
  marker.bindPopup(`
    <b>${pole.label}</b><br>
    Тип: ${type.name}<br>
    Статус: ${statusLabel}<br>
    Координаты: ${pole.lat.toFixed(6)}, ${pole.lng.toFixed(6)}
    <br><button onclick="removePoleById(${pole.id})" style="color:red;cursor:pointer;border:none;background:none;margin-top:4px">✕ Удалить</button>
  `);
  pole._marker = marker;
}

function removePoleById(id) {
  saveHistory();
  const idx = poles.findIndex((p) => p.id === id);
  if (idx === -1) return;
  if (poles[idx]._marker) poleLayer.removeLayer(poles[idx]._marker);
  poles.splice(idx, 1);
  renumberPoles();
}

function removePoleFromTable(id) {
  saveHistory();
  removePoleById(id);
}

function renumberPoles() {
  poles.forEach((p, i) => {
    p.id = i + 1;
    p.label = `Опора ${i + 1}`;
  });
  poleCounter = poles.length + 1;
  poleLayer.clearLayers();
  poles.forEach((p) => renderPole(p));
  updateTable();
  updateConnections();
  updateUndoButtons();
}

function updateConnections() {
  connectionLayer.clearLayers();
  if (poles.length < 2) return;

  const sorted = [...poles].sort((a, b) => a.id - b.id);
  for (let i = 0; i < sorted.length - 1; i++) {
    const a = sorted[i];
    const b = sorted[i + 1];
    L.polyline(
      [[a.lat, a.lng], [b.lat, b.lng]],
      { color: "#64748b", weight: 2, dashArray: "6,4", opacity: 0.7 }
    ).addTo(connectionLayer);

    const midLat = (a.lat + b.lat) / 2;
    const midLng = (a.lng + b.lng) / 2;
    const dist = calcDistance(a.lat, a.lng, b.lat, b.lng);
    L.marker([midLat, midLng], {
      icon: L.divIcon({
        className: "dist-label",
        html: `<div style="background:rgba(255,255,255,.9);padding:2px 8px;border-radius:4px;font-size:12px;font-weight:600;border:1px solid #ccc;white-space:nowrap;">${dist.toFixed(1)} м</div>`,
        iconSize: [0, 0],
        iconAnchor: [0, 0],
      }),
    }).addTo(connectionLayer);
  }
}

function updateTable() {
  document.getElementById("poleCount").textContent = poles.length;
  const tbody = document.querySelector("#poleTable tbody");
  tbody.innerHTML = "";
  if (poles.length === 0) {
    tbody.innerHTML = '<tr><td colspan="7" class="text-center text-gray-500 py-4">Нет опор. Кликните на карту, чтобы добавить.</td></tr>';
    return;
  }

  const sorted = [...poles].sort((a, b) => a.id - b.id);
  sorted.forEach((p, i) => {
    const type = POLE_TYPES[p.type];
    const prevDist = i > 0 ? calcDistance(sorted[i - 1].lat, sorted[i - 1].lng, p.lat, p.lng).toFixed(1) : "—";
    const statusLabel = p.status === "existing" ? `Сущ. (${EXISTING_TYPES[p.existingType] || p.existingType})` : "Проект.";
    const statusColor = p.status === "existing" ? "#f59e0b" : "#10b981";
    const tr = document.createElement("tr");
    tr.className = "border-b border-gray-200 hover:bg-gray-50";
    tr.innerHTML = `
      <td class="px-4 py-2 font-medium">${p.id}</td>
      <td class="px-4 py-2"><span class="pole-badge" style="background:${type.color}">${type.name}</span></td>
      <td class="px-4 py-2"><span class="pole-badge" style="background:${statusColor}">${statusLabel}</span></td>
      <td class="px-4 py-2 font-mono text-sm">${p.lat.toFixed(6)}</td>
      <td class="px-4 py-2 font-mono text-sm">${p.lng.toFixed(6)}</td>
      <td class="px-4 py-2 text-right font-mono">${prevDist}</td>
      <td class="px-4 py-2 text-center">
        <button onclick="removePoleFromTable(${p.id})" class="text-red-500 hover:text-red-700 text-sm" title="Удалить">✕</button>
      </td>
    `;
    tbody.appendChild(tr);
  });
}

function calcDistance(lat1, lon1, lat2, lon2) {
  const R = 6371000;
  const dLat = ((lat2 - lat1) * Math.PI) / 180;
  const dLon = ((lon2 - lon1) * Math.PI) / 180;
  const a = Math.sin(dLat / 2) ** 2 + Math.cos((lat1 * Math.PI) / 180) * Math.cos((lat2 * Math.PI) / 180) * Math.sin(dLon / 2) ** 2;
  return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
}

function clearAll() {
  if (poles.length === 0) return;
  if (!confirm("Удалить все опоры?")) return;
  saveHistory();
  poleLayer.clearLayers();
  connectionLayer.clearLayers();
  poles = [];
  poleCounter = 1;
  updateTable();
  updateConnections();
  updateUndoButtons();
}

function exportSVG() {
  if (poles.length === 0) return alert("Нет опор для экспорта");

  const padding = 50;
  const lats = poles.map((p) => p.lat);
  const lngs = poles.map((p) => p.lng);
  const minLat = Math.min(...lats);
  const maxLat = Math.max(...lats);
  const minLng = Math.min(...lngs);
  const maxLng = Math.max(...lngs);
  const latRange = maxLat - minLat || 0.001;
  const lngRange = maxLng - minLng || 0.001;

  const toX = (lng) => padding + ((lng - minLng) / lngRange) * 500;
  const toY = (lat) => padding + ((maxLat - lat) / latRange) * 500;
  const w = 500 + padding * 2;
  const h = 500 + padding * 2;

  const sorted = [...poles].sort((a, b) => a.id - b.id);

  let svg = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 ${w} ${h}" width="${w}" height="${h}">
<style>
  .lbl{font:bold 10px sans-serif;text-anchor:middle;fill:#fff}
  .dl{font:9px sans-serif;text-anchor:middle;fill:#333}
  .tl{font:14px sans-serif;font-weight:700;fill:#333}
  .ll{font:9px sans-serif;fill:#555}
</style>
<rect width="100%" height="100%" fill="#f8f9fa"/>
<text x="${w/2}" y="24" text-anchor="middle" class="tl">Схема расположения опор</text>`;

  for (let i = 0; i < sorted.length - 1; i++) {
    const a = sorted[i], b = sorted[i + 1];
    const dist = calcDistance(a.lat, a.lng, b.lat, b.lng).toFixed(1);
    const mx = (toX(a.lng) + toX(b.lng)) / 2;
    const my = (toY(a.lat) + toY(b.lat)) / 2;
    svg += `<line x1="${toX(a.lng)}" y1="${toY(a.lat)}" x2="${toX(b.lng)}" y2="${toY(b.lat)}" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="5,3"/>`;
    svg += `<text x="${mx}" y="${my-6}" class="dl">${dist} м</text>`;
  }

  sorted.forEach((p) => {
    const type = POLE_TYPES[p.type];
    const cx = toX(p.lng), cy = toY(p.lat);
    svg += `<circle cx="${cx}" cy="${cy}" r="12" fill="${type.color}" stroke="#fff" stroke-width="2"/>`;
    svg += `<text x="${cx}" y="${cy+3}" class="lbl">${p.id}</text>`;
    const stLabel = p.status === "existing" ? `сущ.${EXISTING_TYPES[p.existingType]}` : "проект.";
    svg += `<text x="${cx+18}" y="${cy+3}" class="ll">${p.label} (${type.name}, ${stLabel})</text>`;
  });

  const legY = h - 40;
  svg += `<rect x="${padding}" y="${legY-10}" width="${w-padding*2}" height="2" fill="#e2e8f0"/>`;
  let lx = padding;
  Object.entries(POLE_TYPES).forEach(([, t]) => {
    svg += `<circle cx="${lx+6}" cy="${legY+10}" r="6" fill="${t.color}" stroke="#ccc" stroke-width="1"/>`;
    svg += `<text x="${lx+16}" y="${legY+14}" class="ll">${t.name}</text>`;
    lx += 140;
  });

  svg += `</svg>`;
  downloadFile(svg, "opory.svg", "image/svg+xml");
}

function exportVSD() {
  alert('VSD (Visio) — бинарный формат.\n\nЭкспортируйте в SVG, затем откройте SVG в Visio: Файл → Открыть → выберите .svg\nИли перетащите SVG-файл в окно Visio.');
}

function downloadFile(content, filename, mime) {
  const blob = new Blob([content], { type: mime });
  const url = URL.createObjectURL(blob);
  const a = document.createElement("a");
  a.href = url;
  a.download = filename;
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  URL.revokeObjectURL(url);
}

document.addEventListener("DOMContentLoaded", initApp);