/**
 * 分享页「更多推荐」AI 接口请求（HTTPS 页在 iOS 微信内不能直连 HTTP:9100，须走同源 alienStore 网关）。
 * URL 可用 lifeAiBase 覆盖，例如 lifeAiBase=https://test.ailien.shop/alienStore
 */
(function (global) {
	'use strict';

	var API_LIFE_AI_HTTP = 'http://183.252.196.135:9100';

	function isPageHttps() {
		return (location.protocol || '').toLowerCase() === 'https:';
	}

	function isIosWxBrowser() {
		var ua = navigator.userAgent || '';
		return /iphone|ipad|ipod/i.test(ua) && /micromessenger/i.test(ua);
	}

	function readQueryParam(name) {
		var params = new URLSearchParams(location.search || '');
		var v = params.get(name);
		if (v != null) return String(v);
		var hash = location.hash || '';
		var qi = hash.indexOf('?');
		if (qi >= 0) {
			var hp = new URLSearchParams(hash.slice(qi + 1));
			var hv = hp.get(name);
			if (hv != null) return String(hv);
		}
		return '';
	}

	/**
	 * @param {string} [alienStoreBase] 页面内 API_BASE，如 https://test.ailien.shop/alienStore
	 */
	function resolveLifeAiApiBases(alienStoreBase) {
		var out = [];
		var seen = {};
		function push(base) {
			base = String(base || '').trim().replace(/\/+$/, '');
			if (!base || seen[base]) return;
			seen[base] = true;
			out.push(base);
		}

		var custom = readQueryParam('lifeAiBase').trim();
		if (custom) push(custom);

		var host = (location.hostname || '').toLowerCase();
		if (host === 'test.ailien.shop' || host === 'uat.ailien.shop') {
			push('https://' + host + '/alienStore');
		} else if (alienStoreBase) {
			push(String(alienStoreBase).replace(/\/+$/, ''));
		}

		/* iOS+HTTPS 会拦截明文 fetch；Android 微信常仍可回落直连 IP */
		if (!isPageHttps() || !isIosWxBrowser()) {
			push(API_LIFE_AI_HTTP);
		}

		return out;
	}

	function isLifeAiApiOk(res) {
		if (!res || typeof res !== 'object') return false;
		if (res.success === false) return false;
		var c = res.code;
		return c === 200 || c === '200' || Number(c) === 200;
	}

	function extractRecommendList(res) {
		if (!res || typeof res !== 'object') return [];
		if (!isLifeAiApiOk(res)) return [];
		var raw = res.data != null ? res.data : res.result;
		if (Array.isArray(raw)) return raw;
		if (raw && typeof raw === 'object') {
			var keys = [
				'list',
				'records',
				'rows',
				'content',
				'stores',
				'storeList',
				'storeVos',
				'items'
			];
			for (var i = 0; i < keys.length; i++) {
				if (Array.isArray(raw[keys[i]])) return raw[keys[i]];
			}
		}
		if (Array.isArray(res.list)) return res.list;
		if (Array.isArray(res.records)) return res.records;
		return [];
	}

	/**
	 * 按顺序尝试多个 API 根地址，401/404/网络失败时换下一个。
	 */
	function fetchLifeAiPostJson(alienStoreBase, apiPath, body) {
		var bases = resolveLifeAiApiBases(alienStoreBase);
		var idx = 0;

		function next(err) {
			if (idx >= bases.length) {
				return Promise.reject(err || new Error('lifeAi recommend failed'));
			}
			var url = bases[idx++] + apiPath;
			return fetch(url, {
				method: 'POST',
				mode: 'cors',
				credentials: 'omit',
				headers: {
					Accept: 'application/json',
					'Content-Type': 'application/json;charset=UTF-8'
				},
				body: JSON.stringify(body)
			})
				.then(function (res) {
					if (!res.ok) {
						if (res.status === 401 || res.status === 403 || res.status === 404) {
							return next(new Error('HTTP ' + res.status));
						}
						throw new Error('HTTP ' + res.status);
					}
					return res.json();
				})
				.then(function (json) {
					if (json && (json.code === 401 || json.code === '401')) {
						return next(new Error('code 401'));
					}
					return json;
				})
				.catch(function (e) {
					return next(e);
				});
		}

		return next();
	}

	/**
	 * @param {function(string): string} getParam 如 getMergedParam / mergedQ
	 */
	function getMergedRecommendUserLocation(getParam, defaults) {
		defaults = defaults || {};
		var defLat = defaults.lat != null ? defaults.lat : 38.925747;
		var defLng = defaults.lng != null ? defaults.lng : 121.662531;
		var defCity = defaults.city || '大连市';
		var gp =
			typeof getParam === 'function'
				? getParam
				: function (n) {
						return readQueryParam(n);
					};

		function pick() {
			var args = arguments;
			var i;
			for (i = 0; i < args.length; i++) {
				var v = String(gp(args[i]) || '').trim();
				if (v) return v;
			}
			return '';
		}

		var latRaw = pick('userLat', 'latitude', 'lat', 'weidu');
		var lngRaw = pick('userLng', 'longitude', 'lon', 'lng', 'jingdu');
		var cityRaw = pick('userCity', 'city');

		return {
			userLat:
				latRaw !== '' && !isNaN(Number(latRaw)) ? Number(latRaw) : defLat,
			userLng:
				lngRaw !== '' && !isNaN(Number(lngRaw)) ? Number(lngRaw) : defLng,
			userCity: cityRaw !== '' ? cityRaw : defCity
		};
	}

	global.LifeAiFetch = {
		API_LIFE_AI_HTTP: API_LIFE_AI_HTTP,
		isPageHttps: isPageHttps,
		isIosWxBrowser: isIosWxBrowser,
		resolveLifeAiApiBases: resolveLifeAiApiBases,
		isLifeAiApiOk: isLifeAiApiOk,
		extractRecommendList: extractRecommendList,
		fetchLifeAiPostJson: fetchLifeAiPostJson,
		getMergedRecommendUserLocation: getMergedRecommendUserLocation
	};
})(typeof window !== 'undefined' ? window : this);