From c723339b51e395e4e74efedae529597753d81c84 Mon Sep 17 00:00:00 2001
From: Anson Gao <s1496k030@gmail.com>
Date: Wed, 6 Sep 2023 00:22:12 +0800
Subject: [PATCH] calculate total bonus and cost if buy all numbers

---
 .gitignore        |  1 +
 index.js          | 60 +++++++++++++++++++++++++++++++----------------
 package-lock.json | 29 +++++++++++++++++++++++
 package.json      |  3 +--
 4 files changed, 71 insertions(+), 22 deletions(-)
 create mode 100644 .gitignore
 create mode 100644 package-lock.json

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b512c09
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/index.js b/index.js
index ad0304d..e31f189 100644
--- a/index.js
+++ b/index.js
@@ -1,28 +1,48 @@
-var numeral = require('numeral');
-var Combinatorics = require('js-combinatorics');
+const { Combination } = require('js-combinatorics');
+
+function printProgress(progress) {
+    process.stdout.clearLine(0);
+    process.stdout.cursorTo(0);
+    process.stdout.write(progress);
+}
 
 (function () {
     'use strict';
-    var winnings = []; // NTD
-    winnings.push({m: 6, s: null, bouns: 39299711});
-    winnings.push({m: 5, s: 1, bouns: 3230113});
-    winnings.push({m: 5, s: null, bouns: 49011});
-    winnings.push({m: 4, s: 1, bouns: 11777});
-    winnings.push({m: 4, s: null, bouns: 1655});
-    winnings.push({m: 3, s: 1, bouns: 1000});
-    winnings.push({m: 2, s: 1, bouns: 400});
-    winnings.push({m: 3, s: null, bouns: 400});
+    const costPerTicket = 50; // NTD
+    const randomNumbers = [1, 2, 3, 4, 5, 6];
+    const randomSpecialNumber = 7;
+    const prizes = {}; // NTD			
+    prizes['6:0'] = { name: '頭獎', m: 6, s: null, bonus: 104538797, acc: 0 };
+    prizes['5:1'] = { name: '貳獎', m: 5, s: 1, bonus: 10089281, acc: 0 };
+    prizes['5:0'] = { name: '參獎', m: 5, s: null, bonus: 120323, acc: 0 };
+    prizes['4:1'] = { name: '肆獎', m: 4, s: 1, bonus: 18129, acc: 0 };
+    prizes['4:0'] = { name: '伍獎', m: 4, s: null, bonus: 2000, acc: 0 };
+    prizes['3:1'] = { name: '陸獎', m: 3, s: 1, bonus: 1000, acc: 0 };
+    prizes['2:1'] = { name: '柒獎', m: 2, s: 1, bonus: 400, acc: 0 };
+    prizes['3:0'] = { name: '普獎', m: 3, s: null, bonus: 400, acc: 0 };
+
+    const allNumbers = new Array(49).fill(1).map(function (v, i) {return v + i;});
+    const allCombinations = new Combination(allNumbers, 6);
 
-    var allNumbers = new Array(49).fill(1).map(function (v, i) {return v + i;}),
-        allCombinations = Combinatorics.bigCombination(allNumbers, 6);
+    console.log(`Cost for buying all combinations: NTD ${
+        new Intl.NumberFormat().format(allCombinations.length * BigInt(costPerTicket))
+    }`);
 
-    function hasBalls(nums, matchs) {
-        return matchs.every(function (match) {
-            return nums.indexOf(match) > -1;
-        });
+    let totalBonus = 0n;
+    for(let i = 0n; i < allCombinations.length; i++) {
+        const comb = allCombinations.nth(i);
+        const matchedNumbers = comb.filter(n => randomNumbers.includes(n)).length;
+        const matchedSpecialNumber = comb.includes(randomSpecialNumber) ? 1 : 0;
+        const prizeKey = `${matchedNumbers}:${matchedSpecialNumber}`;
+        const matchedPrize = prizes[prizeKey];
+        if (matchedPrize) {
+            matchedPrize.acc += matchedPrize.bonus;
+            totalBonus += BigInt(matchedPrize.bonus);
+            printProgress(`Progress: ${i + 1n}/${allCombinations.length}`);
+        }
     }
 
-    console.log(allCombinations.filter(function (nums) {
-        return hasBalls(nums, [1, 2, 3, 4, 5, 6]);
-    }));
+    console.log(`Bonus if buying all tickets: NTD ${
+        new Intl.NumberFormat().format(totalBonus)
+    }`);
 }());
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..2703cd8
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,29 @@
+{
+  "name": "lottery",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "lottery",
+      "version": "1.0.0",
+      "license": "MIT",
+      "dependencies": {
+        "js-combinatorics": "2.1.1"
+      },
+      "devDependencies": {}
+    },
+    "node_modules/js-combinatorics": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/js-combinatorics/-/js-combinatorics-2.1.1.tgz",
+      "integrity": "sha512-jKLV+oIyz0TCr7GBhyuOwngntu1rCxSO+lbVTS232HYowA13CTk0RSmPq6nuXGLFaq2ZWLDQqEwJ6LCDnYR0+A=="
+    }
+  },
+  "dependencies": {
+    "js-combinatorics": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/js-combinatorics/-/js-combinatorics-2.1.1.tgz",
+      "integrity": "sha512-jKLV+oIyz0TCr7GBhyuOwngntu1rCxSO+lbVTS232HYowA13CTk0RSmPq6nuXGLFaq2ZWLDQqEwJ6LCDnYR0+A=="
+    }
+  }
+}
diff --git a/package.json b/package.json
index 7120dcf..efcaf55 100644
--- a/package.json
+++ b/package.json
@@ -4,8 +4,7 @@
   "description": "try to analyze the winnings of lottery",
   "main": "index.js",
   "dependencies": {
-    "js-combinatorics": "^0.5.2",
-    "numeral": "^2.0.6"
+    "js-combinatorics": "2.1.1"
   },
   "devDependencies": {},
   "scripts": {