package com.wikiway.nebula.common.format;

import java.util.Scanner;

/**
 * 数字金额(元、分)转为英文
 * 
 * @see http://www.statman.info/conversions/number_scales.html
 * @author zzf 增强：1)增加小数金额 2)正确支持million、billion(原版不正确)，金额限制<20亿(2 billion)。
 */
public class NumToWords {
	String string;
	String st1[] = { "", "one", "two", "three", "four", "five", "six", "seven",
			"eight", "nine", };
	String st2[] = { "hundred", "thousand", "million", "billion" };
	String st3[] = { "ten", "eleven", "twelve", "thirteen", "fourteen",
			"fifteen", "sixteen", "seventeen", "eighteen", "nineteen", };
	String st4[] = { "twenty", "thirty", "forty", "fifty", "sixty", "seventy",
			"eighty", "ninety" };

	public String convert(double number) {
		return convert(number, "dollars", "cents");
	}

	public String convert(double number, String dollarsUnit, String centsUnit) {
		int b1 = (int) number;
		String s1 = convert(b1, dollarsUnit);
		double b2 = number - b1;
		if (b2 != 0) {
			// 金额取两位小数
			int cents = (int) Math.round(b2 * 100);
			// String s2=convert(cents,"cents");
			// s1+=" and "+s2;
			s1 += " and " + cents + " " + cents;
		} else {
			s1 += " only";
		}
		return s1;
	}

	private String convert(int number, String unit) {
		int n = 1;
		string = "";
		while (number != 0) {
			number = convertSeg(number, n);
			n++;
		}
		string = string.trim().replaceAll("  ", " ");
		if (unit == null || unit.length() == 0) {
			return string;
		}
		return string + " " + unit;
	}

	private int convertSeg(int number, int n) {
		int word;
		switch (n) {
		case 1:
			word = number % 100;
			pass(word);
			if (number > 100 && number % 100 != 0) {
				show("and ");
			}
			number /= 100;
			break;

		case 2:
			word = number % 10;
			if (word != 0) {
				show(" ");
				show(st2[0]);
				show(" ");
				pass(word);
			}
			number /= 10;
			break;
		case 3:
			word = number % 1000;
			if (number < 1000) {
				show(" ");
				show(st2[1]);
				show(" ");
				int n1 = 1;
				while (number != 0) {
					number = convertSeg(number, n1);
					n1++;
				}
			} else if (word != 0) {
				show(" ");
				show(st2[1]);
				show(" ");
				pass(word);
			}
			number /= 1000;
			break;

		case 4:
			word = number % 1000;
			if (number < 1000) {
				show(" ");
				show(st2[2]);
				show(" ");
				int n2 = 1;
				while (number != 0) {
					number = convertSeg(number, n2);
					n2++;
				}
			} else if (word != 0) {
				show(" ");
				show(st2[2]);
				show(" ");
				pass(word);
			}
			number /= 1000;
			break;

		case 5:
			word = number % 100;
			if (word != 0) {
				show(" ");
				show(st2[3]);
				show(" ");
				pass(word);
			}
			number /= 100;
			break;
		}
		return number;
	}

	private void pass(int number) {
		int word, q;
		if (number < 10) {
			show(st1[number]);
		} else if (number < 20) {
			show(st3[number - 10]);
		} else if (number < 100) {
			word = number % 10;
			if (word == 0) {
				q = number / 10;
				show(st4[q - 2]);
			} else {
				q = number / 10;
				show(st1[word]);
				show(" ");
				show(st4[q - 2]);
			}
		} else {
			int n1 = 1;
			while (number != 0) {
				number = convertSeg(number, n1);
				n1++;
			}
		}
	}

	private void show(String s) {
		String st;
		st = string;
		string = s;
		string += st;
	}

	public static void main(String[] args) {
		NumToWords w = new NumToWords();
		Scanner input = new Scanner(System.in);
		// 123450.6789
		// should be:one hundred and twenty three thousand four hundred and
		// fifty dollars and 68 cents
		System.out.print("Enter Number: ");
		float num = input.nextFloat();
		String inwords = w.convert(num);
		System.out.println(inwords);
	}
}