'use strict';

// 校区地图：中国地图 + 学校点位（启用=涟漪点亮，停用/未定位=灰点）+ 右侧列表。
// 数据：GET /api/schools（JSON 种子 + 运行时合并）；底图：/vendor/china-map.json
(function () {
  const $ = (id) => document.getElementById(id);
  const CENTER = [104.5, 36];
  const ZOOM = 1.55;

  let chart = null;
  let schools = [];
  let cityPoints = [];
  let cityLabelsVisible = false;
  let inited = false;
  let loading = false;
  let selectedId = null;

  function esc(value) {
    const div = document.createElement('div');
    div.textContent = String(value == null ? '' : value);
    return div.innerHTML;
  }

  function fmtDate(ymd) {
    const s = String(ymd || '');
    return /^\d{8}$/.test(s) ? `${Number(s.slice(4, 6))}/${Number(s.slice(6, 8))}` : '';
  }

  function opsText(school) {
    if (!school.ops) return '运营数据不可用';
    if (!school.ops.shopCount) return '未关联运营数据';
    return `${school.ops.shopCount} 店${school.ops.lastDate ? ' · 最近 ' + fmtDate(school.ops.lastDate) : ''}`;
  }

  function shortProvince(name) {
    const raw = String(name || '');
    const short = raw
      .replace(/特别行政区$/, '')
      .replace(/(壮族|回族|维吾尔)?自治区$/, '')
      .replace(/省$/, '')
      .replace(/市$/, '');
    return short || raw;
  }

  /** 门店数越多颜色越深，用来区分学校的经营体量 */
  function shopColor(count) {
    const n = Number(count) || 0;
    if (n >= 10) return '#e8501f';
    if (n >= 4) return '#ff8a5c';
    if (n >= 1) return '#ffb894';
    return '#d8d1c9';
  }

  function buildCityPoints(data) {
    const points = [];
    for (const info of Object.values(data || {})) {
      const cities = (info && info.cities) || {};
      for (const [name, coord] of Object.entries(cities)) {
        if (Array.isArray(coord) && coord.length === 2) points.push({ name, value: coord });
      }
    }
    return points;
  }

  function toPoint(school) {
    return {
      name: school.name,
      value: [school.lng, school.lat],
      schoolId: school.id,
      itemStyle: { color: shopColor(school.ops && school.ops.shopCount) },
    };
  }

  function buildOption() {
    const on = schools.filter((s) => s.enabled && s.lng != null && s.lat != null);
    const off = schools.filter((s) => !(s.enabled && s.lng != null && s.lat != null));
    return {
      tooltip: {
        trigger: 'item',
        backgroundColor: 'rgba(255,255,255,.96)',
        borderColor: '#e8e2db',
        borderWidth: 1,
        padding: [8, 10],
        textStyle: { color: '#3f3a35', fontSize: 12 },
        formatter(params) {
          const school = schools.find((s) => s.id === params.data.schoolId);
          if (!school) return params.name;
          const status = school.enabled ? '已启用' : '已停用';
          const point = school.lng == null ? '未定位' : `${school.lng.toFixed(4)}, ${school.lat.toFixed(4)}`;
          return `<b>${esc(school.name)}</b><br>${esc(school.province || '—')}${school.city ? ' · ' + esc(school.city) : ''}<br>${status} · ${opsText(school)}<br><span style="color:#9a938c">${point}</span>`;
        },
      },
      geo: {
        map: 'china',
        roam: true,
        center: CENTER,
        zoom: ZOOM,
        scaleLimit: { min: 1, max: 12 },
        itemStyle: { areaColor: '#f7f5f2', borderColor: '#ddd6cd', borderWidth: 0.8 },
        label: { show: true, color: '#8f8478', fontSize: 10, formatter: (p) => shortProvince(p.name) },
        emphasis: { itemStyle: { areaColor: '#efeae4' }, label: { show: true, color: '#5b534c', fontSize: 10 } },
        select: { disabled: true },
      },
      series: [
        {
          id: 'cities',
          type: 'scatter',
          coordinateSystem: 'geo',
          data: cityPoints,
          symbolSize: 2,
          itemStyle: { color: '#d5cdc4' },
          label: {
            show: cityLabelsVisible,
            position: 'right',
            distance: 2,
            fontSize: 9,
            color: '#a39a91',
            formatter: (p) => p.name,
          },
          labelLayout: { hideOverlap: true },
          silent: true,
          zlevel: 0,
        },
        {
          id: 'on',
          type: 'effectScatter',
          coordinateSystem: 'geo',
          data: on.map(toPoint),
          symbolSize: 11,
          showEffectOn: 'render',
          rippleEffect: { brushType: 'stroke', scale: 3.4, period: 3.6 },
          itemStyle: { shadowBlur: 8, shadowColor: 'rgba(255,107,53,.35)' },
          label: {
            show: true,
            position: 'right',
            distance: 6,
            formatter: (p) => p.name,
            fontSize: 11,
            color: '#5b534c',
          },
          emphasis: { scale: 1.4 },
          zlevel: 2,
        },
        {
          id: 'off',
          type: 'scatter',
          coordinateSystem: 'geo',
          data: off.map(toPoint),
          symbolSize: 6,
          itemStyle: { color: '#b8b2ad' },
          label: { show: false },
          zlevel: 1,
        },
      ],
    };
  }

  function renderLegend() {
    const box = $('schoolsLegend');
    if (!box) return;
    const hasOps = schools.some((s) => s.ops && s.ops.shopCount > 0);
    if (!hasOps) {
      box.innerHTML = '';
      return;
    }
    box.innerHTML = '<span class="schools-legend-title">门店数</span>'
      + '<span><i style="background:#d8d1c9"></i>0</span>'
      + '<span><i style="background:#ffb894"></i>1-3</span>'
      + '<span><i style="background:#ff8a5c"></i>4-9</span>'
      + '<span><i style="background:#e8501f"></i>10+</span>'
      + '<span class="schools-legend-sep"></span>'
      + '<span><i class="hollow"></i>停用 / 未定位</span>';
  }

  function renderMap(force) {
    const box = $('schoolsMap');
    if (!box) return;
    if (!chart) {
      chart = echarts.init(box);
      chart.on('georoam', () => {
        const option = chart.getOption();
        const zoom = (option.geo && option.geo[0] && option.geo[0].zoom) || ZOOM;
        const shouldShow = zoom >= 2;
        if (shouldShow === cityLabelsVisible) return;
        cityLabelsVisible = shouldShow;
        chart.setOption({ series: [{ id: 'cities', label: { show: shouldShow } }] });
      });
    }
    chart.setOption(buildOption(), !!force);
    renderLegend();
  }

  function renderList(data) {
    const list = $('schoolsList');
    const count = $('schoolsCount');
    if (!list) return;
    const enabled = data.enabledCount || 0;
    if (count) count.textContent = `${enabled} / ${schools.length} 已启用`;

    if (!schools.length) {
      list.innerHTML = '<div class="empty-hint ops-empty" style="min-height:220px"><p>还没有学校</p><small>内置学校缺失，请检查 server/schools.seed.json</small></div>';
      return;
    }

    const groups = new Map();
    for (const school of schools) {
      const key = school.province || '未标注省份';
      if (!groups.has(key)) groups.set(key, []);
      groups.get(key).push(school);
    }

    list.innerHTML = [...groups.entries()].map(([province, items]) => {
      const onCount = items.filter((s) => s.enabled && s.lng != null).length;
      const rows = items.map((s) => `
        <div class="schools-item${s.id === selectedId ? ' on' : ''}" data-id="${esc(s.id)}">
          <div class="schools-item-name">
            <span class="schools-dot${s.enabled && s.lng != null ? '' : ' off'}"${s.enabled && s.lng != null ? ` style="background:${shopColor(s.ops && s.ops.shopCount)}"` : ''}></span>
            <span>${esc(s.name)}</span>
            ${s.seed ? '<span class="badge badge-muted">内置</span>' : ''}
            ${s.lng == null ? '<span class="badge badge-warn">未定位</span>' : ''}
          </div>
          <div class="schools-item-meta">
            <span>${esc(s.city || province)}</span>
            <span>${esc(opsText(s))}</span>
          </div>
        </div>`).join('');
      return `<div class="schools-group">${esc(province)} <em>${onCount}/${items.length}</em></div>${rows}`;
    }).join('');

    list.querySelectorAll('[data-id]').forEach((el) => {
      el.addEventListener('click', () => selectSchool(el.dataset.id, true));
    });
  }

  function selectSchool(id, fly) {
    const school = schools.find((s) => s.id === id);
    if (!school) return;
    selectedId = id;
    renderList({ enabledCount: schools.filter((s) => s.enabled && s.lng != null).length });
    if (chart && school.lng != null) {
      if (fly) chart.setOption({ geo: { center: [school.lng, school.lat], zoom: 8 } });
      chart.dispatchAction({ type: 'highlight', seriesId: 'on', name: school.name });
    }
  }

  function bind() {
    const reset = $('btnSchoolsReset');
    if (reset) {
      reset.addEventListener('click', () => {
        if (chart) chart.setOption({ geo: { center: CENTER, zoom: ZOOM } });
      });
    }
    window.addEventListener('resize', () => { if (chart) chart.resize(); });
  }

  async function load() {
    if (loading) return;
    loading = true;
    try {
      const [geoRes, listRes, cityRes] = await Promise.all([
        fetch('/vendor/china-map.json'),
        fetch('/api/schools'),
        fetch('/vendor/cn-cities.json').catch(() => null),
      ]);
      if (!geoRes.ok) throw new Error('底图加载失败');
      const geo = await geoRes.json();
      const data = await listRes.json();
      echarts.registerMap('china', geo);
      if (cityRes && cityRes.ok) {
        try { cityPoints = buildCityPoints(await cityRes.json()); } catch { cityPoints = []; }
      }
      schools = data.schools || [];
      renderList(data);
      renderMap(true);
    } catch (e) {
      const box = $('schoolsMap');
      if (box) box.innerHTML = `<div class="empty-hint ops-empty"><p>地图加载失败</p><small>${esc(e.message || e)}</small></div>`;
    } finally {
      loading = false;
    }
  }

  // 运营数据变更后，学校的关联门店数/最近日期会变，需要重新拉取
  window.addEventListener('ops:data-changed', () => {
    if (inited) load();
  });

  window.shanSchoolsInit = function () {
    if (!inited) {
      inited = true;
      bind();
      load();
    } else if (chart) {
      chart.resize();
    }
  };
})();