// https://github.com/uxitten/polyfill/blob/master/string.polyfill.js
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
import { Tag } from "antd";
import { CaretUpOutlined, CaretDownOutlined } from "@ant-design/icons";
import moment from "moment";

if (!String.prototype.padStart) {
	String.prototype.padStart = function padStart(targetLength, padString) {
		targetLength = targetLength >> 0; // floor if number or convert non-number to 0;
		padString = String(typeof padString !== "undefined" ? padString : " ");
		if (this.length > targetLength) {
			return String(this);
		} else {
			targetLength = targetLength - this.length;
			if (targetLength > padString.length) {
				padString += padString.repeat(targetLength / padString.length); // append to original to ensure we are longer than needed
			}
			return padString.slice(0, targetLength) + String(this);
		}
	};
}

if (!Object.fromEntries) {
  Object.fromEntries = function(entries) {
    const obj = {};
    for (let i = 0; i < entries.length; ++i) {
      const entry = entries[i];
      if (entry && entry.length === 2) {
        obj[entry[0]] = entry[1];
      }
    }
    return obj;
  };
}

export function copy(obj) {
	return JSON.parse(JSON.stringify(obj));
}

export function named(value) {
	return function (target) {
		target.definedName = value;
	};
}

export function formatCurrency(name) {
	if (name === "USD") {
		return "$";
	} else if (name === "RMB") {
		return "￥";
	} else if (name === "EUR") {
		return "€";
	} else if (name === "GBP") {
		return "£";
	} else {
		return name + " ";
	}
}

export function formatPrice(price) {
	return Math.ceil(price).toLocaleString();
}

// 千分符的金额转成数字，默认为0
export function price_to_number(price) {
	const num_string = (price + "").replace(/,/g, "");
	const number = parseFloat(num_string);
	return isNaN(number) ? 0 : number;
}

export function formatPercent(number) {
	return Math.round(number * 100) + "%";
}

export function percentToDecimal(number) {
	return parseFloat(number) / 100;
}

export function formatDate(date) {
	if (isEmpty(date)) {
		return "NaN";
	}

	const year = date.getFullYear();
	const month = date.getMonth() + 1;
	const day = date.getDate();

	const monthStr = ("" + month).padStart(2, 0);
	const dayStr = ("" + day).padStart(2, 0);
	const formatted = year + "-" + monthStr + "-" + dayStr;

	return formatted;
}

export function formatTime(date) {
	const hours = date.getHours();
	const minutes = date.getMinutes();

	const hoursStr = ("" + hours).padStart(2, 0);
	const minutesStr = ("" + minutes).padStart(2, 0);
	const formatted = hoursStr + ":" + minutesStr;

	return formatted;
}

export function formatDatetime(date) {
	const year = date.getFullYear();
	const month = date.getMonth() + 1;
	const day = date.getDate();

	const monthStr = ("" + month).padStart(2, 0);
	const dayStr = ("" + day).padStart(2, 0);

	const hours = date.getHours();
	const minutes = date.getMinutes();

	const hoursStr = ("" + hours).padStart(2, 0);
	const minutesStr = ("" + minutes).padStart(2, 0);

	const formatted = year + "-" + monthStr + "-" + dayStr + " " + hoursStr + ":" + minutesStr;

	return formatted;
}

export function mixins(...list) {
	return function (target) {
		list.forEach(val => {
			const mixinObj = Object.create(val.prototype, {});
			const name = Object.getPrototypeOf(mixinObj).constructor.name;
			const camelCase = name.substr(0, 1).toLowerCase() + name.substr(1);
			Object.assign(target.prototype, { [camelCase]: mixinObj });
		});
	};
}

export function camelCase(name) {
	return name.substr(0, 1).toLowerCase() + name.substr(1);
}

export class UrlBuilder {
	constructor(url) {
		this.url = url;
		this.paramList = [];
	}

	append(name, value) {
		if (isNotEmpty(value)) {
			this.paramList.push({ name, value });
		}
		return this;
	}

	build() {
		this.paramList.forEach((e, i, a) => {
			if (i === 0) {
				this.url += "?";
			} else {
				this.url += "&";
			}
			this.url += e.name + "=" + e.value;
		});
		return this.url;
	}
}

export function isNotEmpty(val) {
	return val !== undefined && val !== null && val !== "";
}

/**
 * ! 不支持计算 Set 或 Map
 * @param {*} val
 * @example
 * true if: 0, [], {}, null, '', undefined
 * false if: 'false', 'undefined'
 */
export function isEmpty(val) {
	// return val === undefined || val === null || val === "";
  return [Object, Array].includes((val || {}).constructor) && !Object.entries((val || {})).length;
}

/**
 * @example
 * empty(0) => false
 */
export function empty(a) {
	if (a === "") return true; // 检验空字符串
	if (a === "null") return true; // 检验字符串类型的null
	if (a === "undefined") return true; // 检验字符串类型的 undefined
	if (!a && a !== 0 && a !== "") return true; // 检验 undefined 和 null
	if (Array.prototype.isPrototypeOf(a) && a.length === 0) return true; // 检验空数组
	if (Object.prototype.isPrototypeOf(a) && Object.keys(a).length === 0) return true; // 检验空对象
	return false;
}

export function prepareUrl(url) {
	return new UrlBuilder(url);
}

export function debounce(fn, delay = 500) {
	let timer;
	return e => {
		e.persist();
		clearTimeout(timer);
		timer = setTimeout(() => {
			fn(e);
		}, delay);
	};
}

export function throttle(fn, delay, atleast) {
	let timeout = null;
		let startTime = new Date();
	return function () {
		const curTime = new Date();
		clearTimeout(timeout);
		if (curTime - startTime >= atleast) {
			fn();
			startTime = curTime;
		} else {
			timeout = setTimeout(fn, delay);
		}
	};
}

export function clickUrl(url) {
	const httpLink = document.createElement("a");
	httpLink.href = url;
	httpLink.target = "_blank";
	httpLink.click();
}

export function show_vs_tag(vs, vs_diff, data1, data2) {
	let tag = "-";
	if (parseInt(vs) < 0) {
		tag = (
			<Tag icon={<CaretDownOutlined />} color="gold">
				{vs} {vs_diff}
			</Tag>
		);
	} else if (parseInt(vs) > 0) {
		tag = (
			<Tag icon={<CaretUpOutlined />} color="lime">
				{vs} {vs_diff}
			</Tag>
		);
	}
	return (
		<span>
			<div>
				{data1} vs {data2}
			</div>
			{tag}
		</span>
	);
}

// 数组去掉重复
export function unique(arr) {
	const x = new Set(arr);
	return [...x];
}
export const uniqWith = (arr, fn) => arr.filter((element, index) => arr.findIndex((step) => fn(element, step)) === index);
export function getWeek(date) {
	// 参数时间戳
	const week = moment(date).day();
	switch (week) {
		case 1:
			return "周一";
		case 2:
			return "周二";
		case 3:
			return "周三";
		case 4:
			return "周四";
		case 5:
			return "周五";
		case 6:
			return "周六";
		case 0:
			return "周日";
	}
}

// 把非数字下标的数组设置下标，因为非数字数组的length为0导致读取失败
export function set_array_index(result) {
	const result_array = [];
	const result_keys = Object.keys(result);
	result_keys.sort(); // 必须做一次排序，用for in循环会导致顺序错误
	for (const key of result_keys) {
		result_array.push(result[key]);
	}
	return result_array;
}

/**
 * 数组排序
 */
export const sortBy = (key) => {
  return (a, b) => (a[key] > b[key]) ? 1 : ((b[key] > a[key]) ? -1 : 0);
};

export const sortDescBy = (key) => {
  return (a, b) => (a[key] < b[key]) ? 1 : ((b[key] < a[key]) ? -1 : 0);
};

/**
 * Object排序keys
 */
export const sortKeys = (obj) =>
  Object.keys(obj)
    .sort()
    .reduce((a, k2) => ({...a, [k2]: obj[k2]}), {});

/**
 * 数组排序, 给定排序数组
 * @param {array} items 需要排序的数组
 * @param {array} keyName 排序的key
 * @param {array} keyOrder 给定排序
 * @returns
 */
export const sortArrayByOrder = (items, keyName, keyOrder) => {
  return items.sort((a, b) => {
    return keyOrder.indexOf(a[keyName]) - keyOrder.indexOf(b[keyName]);
  });
};
/**
 * 合并Object, 递归地
 */
export function merge(...objects) {
  const isDeep = objects.some(obj => obj !== null && typeof obj === 'object');

  const result = objects[0] || (isDeep ? {} : objects[0]);

  for (let i = 1; i < objects.length; i++) {
    const obj = objects[i];

    if (!obj) continue;

    Object.keys(obj).forEach(key => {
      const val = obj[key];

      if (isDeep) {
        if (Array.isArray(val)) {
          result[key] = [].concat(Array.isArray(result[key]) ? result[key] : [result[key]], val);
        } else if (typeof val === 'object') {
          result[key] = merge(result[key], val);
        } else {
          result[key] = val;
        }
      } else {
        result[key] = typeof val === 'boolean' ? val : result[key];
      }
    });
  }

  return result;
}

/**
 * 数组分组
 * - 相当于 lodash 的 _.groupBy
 * @see https://www.lodashjs.com/docs/lodash.groupBy#_groupbycollection-iteratee_identity
 */
export function groupBy(array, callback) {
  return array.reduce((groups, item) => {
    const key = typeof callback === 'function' ? callback(item) : item[callback];

    if (!groups[key]) {
      groups[key] = [];
    }

    groups[key].push(item);
    return groups;
  }, {});
}

/**
 * 创建一个从 object 中选中的属性的对象。
 * @param {*} object
 * @param {array} keys
 */
export function pick(object, keys) {
  return keys.reduce((obj, key) => {
    if (object && Object.prototype.hasOwnProperty.call(object, key)) {
      obj[key] = object[key];
    }
    return obj;
  }, {});
}

/**
 * 返回对象的副本，经过筛选以省略指定的键。
 * @param {*} object
 * @param {string[]} keysToOmit
 * @returns
 */
export function omit(object, keysToOmit) {
  return Object.fromEntries(
    Object.entries(object).filter(
      ([key]) => !keysToOmit.includes(key)
    )
  );
}

/**
 * 深拷贝
 */
export function cloneDeep(value) {
  if (typeof value !== 'object' || value === null) {
    return value;
  }

  const result = Array.isArray(value) ? [] : {};

  for (const key in value) {
    if (Object.prototype.hasOwnProperty.call(value, key)) {
      result[key] = cloneDeep(value[key]);
    }
  }

  return result;
}

/**
 * 向零四舍五入, 固定精度设置
 */
function curriedFix(precision = 0) {
  return function(number) {
    // Shift number by precision places
    const shift = Math.pow(10, precision);
    const shiftedNumber = number * shift;

    // Round to nearest integer
    const roundedNumber = Math.round(shiftedNumber);

    // Shift back decimal place
    return roundedNumber / shift;
  };
}
/**
 * 向零四舍五入, 保留2位小数
 */
export const fixTo2Decimals = curriedFix(2);
/**
 * 向零四舍五入, 保留4位小数
 */
export const fixTo4Decimals = curriedFix(4);

export const fixTo1Decimals = curriedFix(1);
export const fixToInt = curriedFix(0);

/**
 * 映射
 * @example
 * const keyMap = {
    a: [{key: 'a1'}, {key: 'a2', transform: v => v * 2}],
    b: {key: 'b1'}
  };
  const result = objectMapper({a: 1, b: 3}, keyMap);
  // result = {a1: 1, a2: 2, b1: 3}
 *
 */
export function objectMapper(input, keyMap) {
  // Loop through array mapping
  if (Array.isArray(input)) {
    return input.map((obj) => objectMapper(obj, keyMap));
  }

  if (typeof input === 'object') {
    const mappedObj = {};

    Object.keys(input).forEach((key) => {
      // Keep original keys not in keyMap
      if (!keyMap[key]) {
        mappedObj[key] = input[key];
      }
      // Handle array of maps
      if (Array.isArray(keyMap[key])) {
        keyMap[key].forEach((map) => {
          let value = input[key];
          if (map.transform) value = map.transform(value);
          mappedObj[map.key] = value;
        });

        // Handle single map
      } else {
        const map = keyMap[key];
        if (map) {
          let value = input[key];
          if (map.transform) value = map.transform(value);
          if (typeof map === 'string') mappedObj[map] = value;
          mappedObj[map.key || key] = value;
        }
      }
    });

    return mappedObj;
  }

  return input;
}

/**
 * 创建一个对应于对象路径的值数组
 */
export function at(obj, path) {
  let result;
  if (Array.isArray(obj)) {
    // array case
    const indexes = path.split('.').map((i) => parseInt(i));
    result = [];
    for (let i = 0; i < indexes.length; i++) {
      result.push(obj[indexes[i]]);
    }
  } else {
    // object case
    const indexes = path.split('.').map((i) => i);
    result = [obj];
    for (let i = 0; i < indexes.length; i++) {
      result = [result[0][indexes[i]]];
    }
  }
  return result;
}
/**
 * 删除 null/undefined
 */
export function flush(collection) {
  let result, len, i;
  if (!collection) {
    return undefined;
  }
  if (Array.isArray(collection)) {
    result = [];
    len = collection.length;
    for (i = 0; i < len; i++) {
      const elem = collection[i];
      if (elem != null) {
        result.push(elem);
      }
    }
    return result;
  }
  if (typeof collection === 'object') {
    result = {};
    const keys = Object.keys(collection);
    len = keys.length;
    for (i = 0; i < len; i++) {
      const key = keys[i];
      const value = collection[key];
      if (value != null) {
        result[key] = value;
      }
    }
    return result;
  }
  return undefined;
}

/**
 * 千分位 格式化数字
 */
export const numberFormatter = (number) => {
  return new Intl.NumberFormat().format(number);
};

/**
 * @example
 *   const obj = { a: { b: 'c' } };
 *   const keyArr = ['a', 'b'];
 *   getNestedValue(obj, keyArr);  // Returns: 'c'
 */
export const getNestedValue = (obj, keyArr) => {
  return keyArr.reduce((acc, curr) => {
    return acc && acc.hasOwnProperty(curr) ? acc[curr] : undefined;
    // return acc && acc[curr];
  }, obj);
};

/**
 * 计算笛卡尔积
 */
export const cartesianProductArray = (arr, sep = '_', index = 0, prefix = '') => {
  let result = [];
  if(index === arr.length){
      return [prefix];
  }
  arr[index].forEach(item => {
      result = result.concat(cartesianProductArray(arr, sep, index+1, prefix ? `${prefix}${sep}${item}` : `${item}`));
  });
  return result;
};