'use strict';
/**
 * 补齐归属表里缺失的条目（第二轮）。
 *
 * 第一轮对「荔波小七孔」这类名字搜不到——Photon 里收录的是「小七孔」这个景点，
 * 全名反而搜不到。所以这里做两件事：
 *   1. 去掉「风景区/景区/公园/自然保护区/度假区」等后缀再搜一次；
 *   2. 搜不到就用「名字里剥掉修饰词的核心词」再搜。
 * 命中后仍然用**坐标距离**在候选里挑最近的，避免同名异地。
 *
 * 用法：node tools/build-admin-fix.cjs
 */
const fs = require('fs');
const path = require('path');
const cn = require('../lib/places-cn');
const niche = require('../lib/places-niche').NICHE_SPOTS;

const PHOTON = 'https://photon.komoot.io/api/';

function haversine(lat1, lon1, lat2, lon2) {
  const R = 6371;
  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 2 * R * Math.asin(Math.min(1, Math.sqrt(a)));
}

function pickArea(props) {
  const clean = (s) => String(s || '').trim();
  const state = clean(props.state);
  const county = clean(props.county);
  const city = clean(props.city);
  // 优先 county（Photon 里是地级市/州），其次 city（县/区），最后 state
  const area = county || city || state;
  const detail = county && city && city !== county ? city : '';
  return { area, detail, state, level: county ? 'prefecture' : (city ? 'county' : 'province') };
}

/** 名字变体：原名、去后缀、剥掉「XX」前缀的核心词 */
function variants(name) {
  const out = new Set([name]);
  const noSuffix = name.replace(/(风景区|景区|旅游区|度假区|自然保护区|森林公园|地质公园|湿地公园|国家公园|风景名胜区|风景区|风景区|景区|景点|公园|博物馆|纪念馆|故居|遗址|石林|峡谷|瀑布|温泉|梯田|草原|湖泊|湿地|海滩|岛|山|湖|园)$/g, '').trim();
  if (noSuffix && noSuffix.length >= 2) out.add(noSuffix);
  // 「A小七孔」→「小七孔」这类：去掉末尾的行政区前缀
  const core = noSuffix.replace(/^(.{2,4}?)(?=[\u4e00-\u9fa5]{2,4}$)/, '');
  if (core && core.length >= 2) out.add(core);
  return [...out];
}

async function query(name) {
  for (let i = 0; i < 3; i += 1) {
    try {
      const u = new URL(PHOTON);
      u.searchParams.set('q', name);
      u.searchParams.set('limit', '6');
      u.searchParams.set('lang', 'default');
      const res = await fetch(u.toString());
      const text = await res.text();
      if (!text.startsWith('{')) throw new Error('non-json');
      return JSON.parse(text).features || [];
    } catch (err) {
      if (i === 2) return null;
      await new Promise((r) => setTimeout(r, 1200 * (i + 1)));
    }
  }
  return null;
}

async function lookup(name, lat, lon) {
  for (const v of variants(name)) {
    const feats = await query(v);
    if (!feats || !feats.length) continue;
    let best = null;
    for (const f of feats) {
      const co = f.geometry?.coordinates;
      if (!co) continue;
      const d = haversine(lat, lon, Number(co[1]), Number(co[0]));
      if (!best || d < best.d) best = { d, props: f.properties || {} };
    }
    if (!best || best.d > 40) continue;
    const area = pickArea(best.props);
    if (area.area) return area;
    await new Promise((r) => setTimeout(r, 500));
  }
  return null;
}

async function main() {
  const file = path.join(__dirname, '..', 'lib', 'places-admin.js');
  const src = fs.readFileSync(file, 'utf8');
  const SPOT_AREA = JSON.parse(src.match(/const SPOT_AREA = (\{.*?\});/s)[1]);
  const AREA_COORD = JSON.parse(src.match(/const AREA_COORD = (\{.*?\});/s)[1]);

  const items = [];
  for (const s of cn.EXTRA_SCENIC) items.push({ group: 'scenic', name: s[0], lat: s[1], lon: s[2] });
  for (const s of niche) items.push({ group: 'niche', name: s[0], lat: s[1], lon: s[2] });

  const missing = items.filter((it) => !SPOT_AREA[`${it.group}:${it.name}`]);
  console.log('missing', missing.length, '/', items.length);

  let fixed = 0;
  for (let i = 0; i < missing.length; i += 1) {
    const it = missing[i];
    const area = await lookup(it.name, it.lat, it.lon);
    if (area) {
      SPOT_AREA[`${it.group}:${it.name}`] = area;
      if (!AREA_COORD[area.area]) AREA_COORD[area.area] = [it.lat, it.lon];
      fixed += 1;
    }
    if ((i + 1) % 10 === 0) console.log(`  ${i + 1}/${missing.length} fixed=${fixed}`);
    await new Promise((r) => setTimeout(r, 600));
  }

  const body = `'use strict';
/**
 * 内置地点库的归属地名（自动生成，勿手改）。
 *
 * 生成方式：
 *   tools/build-admin.cjs     —— 首轮，Photon 按名检索 + 坐标距离消歧
 *   tools/build-admin-fix.cjs —— 二轮，去后缀/核心词重试，补首轮搜不到的
 *
 * 字段：
 *   SPOT_AREA  { 'scenic:荔波小七孔': { area, detail, state, level } }
 *   AREA_COORD { '荔波县': [lat, lon] }  各地级/县级名的代表坐标，运行时做最近市兜底
 */
const SPOT_AREA = ${JSON.stringify(SPOT_AREA)};

const AREA_COORD = ${JSON.stringify(AREA_COORD)};

module.exports = { SPOT_AREA, AREA_COORD };
`;
  fs.writeFileSync(file, body, 'utf8');
  console.log('written', file, 'entries', Object.keys(SPOT_AREA).length, 'fixed', fixed);
}

main();