Chinese Fortune Analysis System (BaZi)

/* eslint-disable no-param-reassign */ import dayjs from 'dayjs'; import { lunarLeap, solarTermGeneral, lunarMonths, lunarMonthLeap, solarTermsData } from './config.js'; import type {SolarTermItem, LunarDate, ParserResult} from './types.js'; class GeneralLunar { year: number; month: string; day: string; distanceDay: number; getLunarMonthAndDayNumber: LunarDate; parserFile: ParserResult; /** * @param year 西元年 YYYY (ex: 2020, 1992) * @param month 月 MM (ex: 01, 08, 12) * @param day 日 DD (ex: 01, 08, 23, 28) */ constructor(year: number, month: string, day: string) { this.year = year; this.month = month; this.day = day; const start = dayjs('19120101'); const end = dayjs(`${year}${month}${day}`); this.distanceDay = end.diff(start, 'day'); this.getLunarMonthAndDayNumber = this.getLunarMonthAndDayNumberCalc(); this.parserFile = this.parserFileAndSplitSolarTerm(); } /** * 取得農曆月日的值 * @returns {Object} { month, day } */ private getLunarMonthAndDayNumberCalc(): LunarDate { let min = 100000000; let saveMonth: string | number = ''; const start = dayjs('19000131'); const end = dayjs(`${this.year}${this.month}${this.day}`); let dayDistance = end.diff(start, 'day'); lunarLeap.forEach((val: [number, string, string]) => { val[1].split('').forEach((monthVal: string, monthIndex: number) => { const result = monthVal === '0' ? (dayDistance -= 29) : (dayDistance -= 30); if (result >= 0) { min = Math.min(result + 1, min); } if (result < 0 && saveMonth === '') { saveMonth = monthIndex; if (val[0] !== 0 && saveMonth > val[0]) { saveMonth--; } if (parseInt(String(val[0]), 10) === monthIndex && monthIndex !== 0) { saveMonth = lunarMonthLeap[monthIndex - 1]; } } }); }); return { month: typeof saveMonth === 'number' ? lunarMonths[saveMonth] : saveMonth, day: min, }; } /** * 分析文檔並回傳結果和是否節前日期 * @returns {Object} { title, solarTermsSplit } */ private parserFileAndSplitSolarTerm(): ParserResult { const solarTerms: SolarTermItem[] = solarTermsData[this.year - 1900] const result: ParserResult = { previous: '', current: '', next: '', solarTermsSplit: false, }; let min = 1000; solarTerms.forEach((val, index) => { const dateCh = val.title.split(' ')[1]; // e.g. 2017年01月24日 const date = dateCh.replace('年', '').replace('月', '').replace('日', ''); // e.g. 20170124 const start = dayjs(date); const end = dayjs(`${this.year}${this.month}${this.day}`); const dayDistance = end.diff(start, 'day'); if (dayDistance >= 0 && dayDistance < min) { min = Math.min(dayDistance, min); if (solarTerms[index - 1]) result.previous = solarTerms[index - 1].title; result.next = solarTerms[index + 1]?.title || ''; if (result.previous === '') { const dataLength = solarTermsData[this.year - 1899].length; result.previous = solarTermsData[this.year - 1899][dataLength - 1].title; } result.current = val.title; if ( dayDistance === 0 && solarTermGeneral.indexOf(val.title.substring(5, 7)) >= 0 ) { result.solarTermsSplit = true; } } }); return result; } } export default GeneralLunar;