import * as THREE from 'three';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';

const parseResponse = async (r) => {
  const contentType = r.headers.get('content-type') || '';
  if (contentType.includes('application/json')) {
    return r.json();
  }
  const text = await r.text();
  return text ? { text } : {};
};

const API = {
  get: async (url) => {
    const r = await fetch(url);
    if (!r.ok) {
      const text = await r.text();
      throw new Error(`${url}: ${r.status} ${text}`);
    }
    return parseResponse(r);
  },
  post: async (url, body = {}) => {
    const r = await fetch(url, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(body)
    });
    if (!r.ok) {
      const text = await r.text();
      throw new Error(`${url}: ${r.status} ${text}`);
    }
    return parseResponse(r);
  },
  del: async (url) => {
    const r = await fetch(url, { method: 'DELETE' });
    if (!r.ok) {
      const text = await r.text();
      throw new Error(`${url}: ${r.status} ${text}`);
    }
    return parseResponse(r);
  }
};

let currentGroup = null;
let scene, camera, renderer, sphere, controls;
let raycaster = new THREE.Raycaster();
let mouse = new THREE.Vector2();
let markers = [];
let tempMarker = null;
let previewSprites = [];
let tempPreview = null;
let scanPollInterval = null;
let controlsGloballyDisabled = false;

function log(msg) {
  const panel = document.getElementById('log-panel');
  const line = document.createElement('div');
  line.textContent = `${new Date().toLocaleTimeString()} ${msg}`;
  panel.appendChild(line);
  while (panel.children.length > 200) {
    panel.removeChild(panel.firstChild);
  }
  panel.scrollTop = panel.scrollHeight;
}

function setStatus(msg) {
  document.getElementById('status').textContent = `状态：${msg}`;
}

function setControlsDisabled(disabled) {
  controlsGloballyDisabled = disabled;
  ['btn-scan', 'btn-poll-start', 'btn-poll-stop', 'btn-preview', 'btn-add'].forEach(id => {
    const el = document.getElementById(id);
    if (el) el.disabled = disabled;
  });
  ['inp-pan', 'inp-tilt', 'inp-zoom', 'inp-dwell'].forEach(id => {
    const el = document.getElementById(id);
    if (el) el.disabled = disabled;
  });
}

async function withDisabled(id, fn) {
  const el = document.getElementById(id);
  el.disabled = true;
  try {
    return await fn();
  } finally {
    if (!controlsGloballyDisabled) {
      el.disabled = false;
    }
  }
}

function parseStrictFloat(value, name) {
  const num = Number(value);
  if (!Number.isFinite(num)) {
    throw new Error(`${name} 必须是有效数字`);
  }
  return num;
}

function escapeHtml(text) {
  const div = document.createElement('div');
  div.textContent = text;
  return div.innerHTML;
}

function initThree() {
  const container = document.getElementById('panorama-container');
  scene = new THREE.Scene();
  camera = new THREE.PerspectiveCamera(75, container.clientWidth / container.clientHeight, 0.1, 1000);
  camera.position.set(0, 0, 0.1);
  renderer = new THREE.WebGLRenderer({ antialias: true });
  renderer.setSize(container.clientWidth, container.clientHeight);
  container.appendChild(renderer.domElement);

  controls = new OrbitControls(camera, renderer.domElement);
  controls.enableZoom = true;
  controls.enablePan = false;
  controls.rotateSpeed = -0.3;
  controls.minPolarAngle = 0.1;
  controls.maxPolarAngle = Math.PI - 0.1;

  renderer.domElement.addEventListener('click', onPanoramaClick);
  window.addEventListener('resize', onResize);
  animate();
}

function onResize() {
  const container = document.getElementById('panorama-container');
  camera.aspect = container.clientWidth / container.clientHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(container.clientWidth, container.clientHeight);
}

function loadPanorama(groupId) {
  clearMarkers();
  const loader = new THREE.TextureLoader();
  loader.load(`/api/panorama/${groupId}`,
    (texture) => {
      if (sphere) scene.remove(sphere);
      const geo = new THREE.SphereGeometry(50, 60, 40);
      geo.scale(-1, 1, 1);
      const mat = new THREE.MeshBasicMaterial({ map: texture });
      sphere = new THREE.Mesh(geo, mat);
      scene.add(sphere);
      log(`加载全景图: ${groupId}`);
      loadPoints(groupId);
    },
    undefined,
    () => {
      log('全景图未就绪，请先执行扫描');
    }
  );
}

function clearMarkers() {
  markers.forEach(m => scene.remove(m));
  markers = [];
}

function clearTempMarker() {
  if (tempMarker) {
    scene.remove(tempMarker);
    tempMarker = null;
  }
}

function setTempMarker(pan, tilt) {
  clearTempMarker();
  tempMarker = addMarker(pan, tilt, 0x3b82f6);
}

function clearPreviewSprites() {
  previewSprites.forEach(s => scene.remove(s));
  previewSprites = [];
}

function addPreviewPlane(pan, tilt, imageUrl) {
  const loader = new THREE.TextureLoader();
  const mesh = new THREE.Mesh(
    new THREE.PlaneGeometry(1, 1),
    new THREE.MeshBasicMaterial({ color: 0xffffff, side: THREE.DoubleSide, transparent: true, opacity: 0.95 })
  );
  mesh.visible = false;
  scene.add(mesh);
  previewSprites.push(mesh);

  loader.load(imageUrl, (texture) => {
    const imageWidth = texture.image.width || 100;
    const imageHeight = texture.image.height || 100;
    const aspect = imageWidth / imageHeight;
    const baseSize = 5;
    mesh.geometry.dispose();
    mesh.geometry = new THREE.PlaneGeometry(baseSize * aspect, baseSize);
    mesh.material.map = texture;
    mesh.material.needsUpdate = true;

    const r = 46;
    const phi = (90 - tilt) * Math.PI / 180;
    const theta = (pan - 90) * Math.PI / 180;
    const x = r * Math.sin(phi) * Math.cos(theta);
    const y = r * Math.cos(phi);
    const z = r * Math.sin(phi) * Math.sin(theta);
    mesh.position.set(x, y, z);
    // 让平面法线朝外（贴合球面）
    mesh.lookAt(x * 2, y * 2, z * 2);
    mesh.visible = true;
    mesh.userData = { type: 'preview', pan, tilt, imageUrl };
  }, undefined, (err) => {
    log(`加载预览图失败: ${err.message || err}`);
  });

  return mesh;
}

function addMarker(pan, tilt, color = 0x22c55e) {
  const r = 49.5;
  const phi = (90 - tilt) * Math.PI / 180;
  const theta = (pan - 90) * Math.PI / 180;
  const x = r * Math.sin(phi) * Math.cos(theta);
  const y = r * Math.cos(phi);
  const z = r * Math.sin(phi) * Math.sin(theta);
  const geo = new THREE.SphereGeometry(0.4, 16, 16);
  const mat = new THREE.MeshBasicMaterial({ color });
  const mesh = new THREE.Mesh(geo, mat);
  mesh.position.set(x, y, z);
  scene.add(mesh);
  markers.push(mesh);
  return mesh;
}

function onPanoramaClick(event) {
  if (!sphere) return;
  const rect = renderer.domElement.getBoundingClientRect();
  mouse.x = ((event.clientX - rect.left) / rect.width) * 2 - 1;
  mouse.y = -((event.clientY - rect.top) / rect.height) * 2 + 1;
  raycaster.setFromCamera(mouse, camera);
  const intersects = raycaster.intersectObject(sphere);
  if (intersects.length === 0) return;
  const p = intersects[0].point.clone().normalize();
  const pan = ((Math.atan2(p.x, -p.z) * 180 / Math.PI) + 360) % 360;
  const tilt = Math.asin(Math.max(-1, Math.min(1, p.y))) * 180 / Math.PI;
  document.getElementById('inp-pan').value = pan.toFixed(2);
  document.getElementById('inp-tilt').value = tilt.toFixed(2);
  tempPreview = null;
  setTempMarker(pan, tilt);
}

function animate() {
  requestAnimationFrame(animate);
  if (controls) controls.update();
  renderer.render(scene, camera);
}

async function loadGroups() {
  try {
    const status = await API.get('/api/status');
    const select = document.getElementById('group-select');
    select.innerHTML = '';
    const gids = Object.keys(status.groups || {});
    gids.forEach(gid => {
      const opt = document.createElement('option');
      opt.value = gid;
      opt.textContent = gid;
      select.appendChild(opt);
    });
    if (gids.length === 0) {
      currentGroup = null;
      setStatus('未配置摄像头组');
      setControlsDisabled(true);
      return;
    }
    setControlsDisabled(false);
    if (gids.includes(currentGroup)) {
      select.value = currentGroup;
    } else {
      currentGroup = select.options[0].value;
      onGroupChange();
    }
  } catch (e) {
    log(`获取状态失败: ${e.message}`);
  }
}

function onGroupChange() {
  currentGroup = document.getElementById('group-select').value;
  clearTempMarker();
  clearPreviewSprites();
  tempPreview = null;
  loadPanorama(currentGroup);
  renderVideos(currentGroup);
  loadPoints(currentGroup);
}

function renderVideos(groupId) {
  const grid = document.getElementById('video-grid');
  grid.innerHTML = '';
  ['panorama', 'ptz'].forEach(cam => {
    const box = document.createElement('div');
    box.className = 'video-box';

    const title = document.createElement('div');
    title.className = 'title';
    title.textContent = `${cam} - ${groupId}`;

    const img = document.createElement('img');
    img.src = `/api/live/${cam}/${groupId}?marked=1&t=${Date.now()}`;
    img.alt = cam;

    box.appendChild(title);
    box.appendChild(img);
    grid.appendChild(box);
  });
}

async function loadPoints(groupId) {
  try {
    const data = await API.get(`/api/points/${groupId}`);
    clearMarkers();
    clearPreviewSprites();
    const ul = document.getElementById('points');
    ul.innerHTML = '';
    data.points.forEach(p => {
      addMarker(p.pan, p.tilt, 0x22c55e);
      if (p.preview_image) {
        addPreviewPlane(p.pan, p.tilt, `/api/preview-image?path=${encodeURIComponent(p.preview_image)}`);
      }
      const li = document.createElement('li');

      const span = document.createElement('span');
      span.textContent = `P:${p.pan.toFixed(0)} T:${p.tilt.toFixed(0)}`;

      const previewBtn = document.createElement('button');
      previewBtn.textContent = '预览';
      previewBtn.onclick = async () => {
        document.getElementById('inp-pan').value = p.pan.toFixed(2);
        document.getElementById('inp-tilt').value = p.tilt.toFixed(2);
        document.getElementById('inp-zoom').value = p.zoom;
        await runPreview(groupId, p.pan, p.tilt, p.zoom, p.id);
      };

      const delBtn = document.createElement('button');
      delBtn.dataset.id = String(p.id);
      delBtn.textContent = '删除';
      delBtn.onclick = async () => {
        if (!currentGroup) {
          log('未选择摄像头组');
          return;
        }
        if (!confirm('确定删除该扫描点？')) return;
        delBtn.disabled = true;
        try {
          await API.del(`/api/points/${groupId}/${p.id}`);
          loadPoints(groupId);
        } catch (e) {
          log(`删除失败: ${e.message}`);
          delBtn.disabled = false;
        }
      };

      li.appendChild(span);
      li.appendChild(previewBtn);
      li.appendChild(delBtn);
      ul.appendChild(li);
    });
  } catch (e) {
    log(`加载扫描点失败: ${e.message}`);
  }
}

async function updateStatus() {
  if (!currentGroup) return;
  try {
    const status = await API.get('/api/status');
    const g = status.groups[currentGroup];
    if (g) {
      setStatus(g.polling_state);
    }
  } catch (e) {
    // ignore
  }
}

document.getElementById('group-select').addEventListener('change', onGroupChange);

document.getElementById('btn-scan').addEventListener('click', async () => {
  if (!currentGroup) {
    log('未选择摄像头组');
    return;
  }
  if (scanPollInterval) return;
  const scannedGroup = currentGroup;
  const scanBtn = document.getElementById('btn-scan');
  scanBtn.disabled = true;
  setStatus('扫描中...');
  try {
    await API.post(`/api/scan/${scannedGroup}`);
    log(`开始扫描: ${scannedGroup}`);
    scanPollInterval = setInterval(async () => {
      try {
        const prog = await API.get(`/api/scan/${scannedGroup}/progress`);
        const progress = prog.total > 0 ? (prog.current / prog.total) * 100 : 0;
        if (prog.state === 'done' || prog.state === 'failed' || progress >= 100) {
          clearInterval(scanPollInterval);
          scanPollInterval = null;
          if (!controlsGloballyDisabled) scanBtn.disabled = false;
          if (prog.state === 'done') {
            log('扫描完成');
            loadPanorama(scannedGroup);
            loadPoints(scannedGroup);
          } else if (prog.state === 'failed') {
            log(`扫描失败: ${prog.error || 'unknown'}`);
          }
        } else {
          setStatus(`扫描中... ${progress.toFixed(0)}%`);
        }
      } catch (e) {
        clearInterval(scanPollInterval);
        scanPollInterval = null;
        if (!controlsGloballyDisabled) scanBtn.disabled = false;
        setStatus('扫描失败');
        log(`扫描进度获取失败: ${e.message}`);
      }
    }, 1000);
  } catch (e) {
    log(`扫描失败: ${e.message}`);
    if (!controlsGloballyDisabled) scanBtn.disabled = false;
    setStatus('扫描失败');
  }
});

document.getElementById('btn-poll-start').addEventListener('click', async () => {
  if (!currentGroup) {
    log('未选择摄像头组');
    return;
  }
  await withDisabled('btn-poll-start', async () => {
    try {
      await API.post(`/api/poll/${currentGroup}/start`);
      log(`开始轮询: ${currentGroup}`);
    } catch (e) {
      log(`轮询启动失败: ${e.message}`);
    }
  });
});

document.getElementById('btn-poll-stop').addEventListener('click', async () => {
  if (!currentGroup) {
    log('未选择摄像头组');
    return;
  }
  await withDisabled('btn-poll-stop', async () => {
    try {
      await API.post(`/api/poll/${currentGroup}/stop`);
      log(`停止轮询: ${currentGroup}`);
    } catch (e) {
      log(`停止失败: ${e.message}`);
    }
  });
});

async function runPreview(groupId, pan, tilt, zoom, pointId = null) {
  const payload = { pan, tilt, zoom };
  if (pointId !== null) {
    payload.point_id = pointId;
  }
  const result = await API.post(`/api/preview/${groupId}`, payload);
  log(`预览位置: P=${pan.toFixed(1)} T=${tilt.toFixed(1)} Z=${zoom}`);
  if (result.snapshot_url) {
    log(`预览抓拍已保存: ${result.snapshot_path}`);
    if (pointId === null) {
      // 未保存的临时点：记录本次预览图，保存时可关联
      if (tempPreview && tempPreview.mesh) {
        scene.remove(tempPreview.mesh);
        previewSprites = previewSprites.filter(s => s !== tempPreview.mesh);
      }
      clearTempMarker();
      const mesh = addPreviewPlane(pan, tilt, result.snapshot_url);
      tempPreview = { pan, tilt, url: result.snapshot_url, path: result.snapshot_path, mesh };
    } else {
      // 已保存点：刷新列表以显示最新预览图
      loadPoints(groupId);
    }
  }
  return result;
}

document.getElementById('btn-preview').addEventListener('click', async () => {
  if (!currentGroup) {
    log('未选择摄像头组');
    return;
  }
  let pan, tilt, zoom;
  try {
    pan = parseStrictFloat(document.getElementById('inp-pan').value, 'pan');
    tilt = parseStrictFloat(document.getElementById('inp-tilt').value, 'tilt');
    zoom = Number(document.getElementById('inp-zoom').value);
  } catch (e) {
    log(`错误：${e.message}`);
    return;
  }
  if (!Number.isInteger(zoom) || zoom < 1) {
    log('错误：zoom 必须是大于等于 1 的整数');
    return;
  }
  await withDisabled('btn-preview', async () => {
    try {
      await runPreview(currentGroup, pan, tilt, zoom);
    } catch (e) {
      log(`预览失败: ${e.message}`);
    }
  });
});

document.getElementById('btn-add').addEventListener('click', async () => {
  if (!currentGroup) {
    log('未选择摄像头组');
    return;
  }
  await withDisabled('btn-add', async () => {
    let pan, tilt, zoom, dwellTime;
    try {
      pan = parseStrictFloat(document.getElementById('inp-pan').value, 'pan');
      tilt = parseStrictFloat(document.getElementById('inp-tilt').value, 'tilt');
      zoom = Number(document.getElementById('inp-zoom').value);
      dwellTime = parseStrictFloat(document.getElementById('inp-dwell').value, '停留时间');
    } catch (e) {
      log(`错误：${e.message}`);
      return;
    }

    if (pan < 0 || pan > 360) {
      log('错误：pan 必须是 0-360 之间的有限数值');
      return;
    }
    if (tilt < -90 || tilt > 90) {
      log('错误：tilt 必须是 -90-90 之间的有限数值');
      return;
    }
    if (!Number.isInteger(zoom) || zoom < 1) {
      log('错误：zoom 必须是大于等于 1 的整数');
      return;
    }
    if (dwellTime <= 0) {
      log('错误：停留时间必须是大于 0 的有限数值');
      return;
    }

    const payload = { pan, tilt, zoom, dwell_time: dwellTime };
    if (tempPreview) {
      payload.preview_image = tempPreview.path;
    }
    try {
      await API.post(`/api/points/${currentGroup}`, payload);
      log('扫描点已保存');
      clearTempMarker();
      tempPreview = null;
      loadPoints(currentGroup);
    } catch (e) {
      log(`保存失败: ${e.message}`);
    }
  });
});

initThree();
setControlsDisabled(true);
loadGroups();
setInterval(updateStatus, 2000);