docs/fortune_statistics.md

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+# Distribution of fortune
+### 2000 IPs for 365 days, two groups in total
+
+| Fortune Status  | Percentage (1st time)  | Percentage (2nd time)  |
+|-----------------|------------------------|------------------------|
+| 大吉            | 20.33%                 | 20.30%                 |
+| 中吉            | 14.37%                 | 14.34%                 |
+| 小吉            | 10.57%                 | 10.59%                 |
+| 吉              | 14.49%                 | 14.44%                 |
+| 末吉            | 10.14%                 | 10.24%                 |
+| 中平            | 14.29%                 | 14.40%                 |
+| 凶              | 8.64%                  | 8.60%                  |
+| 大凶            | 7.17%                  | 7.09%                  |
+
+# Distribution statistics of daily fortune events
+
+Statistical method: The sum of the number of fortune events that occurred for 2,000 random IPs on the same day.
+
+The x-axis is the index value and the y-axis is the number of times.
+
+| 宜 (Good Fortune)                              | 忌 (Bad Fortune)                             |
+|------------------------------------------------|----------------------------------------------|
+| ![Good Fortune](./good_fortune_statistics.png) | ![Bad Fortune](./bad_fortune_statistics.png) |
+
+
+[Statistics code](./main.js)

docs/fortune_status_statistics.md

@@ -1,20 +0,0 @@
-# 運勢出現分佈
-
-大吉: 20.33%
-中吉: 14.37%
-小吉: 10.57%
-吉: 14.49%
-末吉: 10.14%
-中平: 14.29%
-凶: 8.64%
-大凶: 7.17%
-
-大吉: 20.30%
-中吉: 14.34%
-小吉: 10.59%
-吉: 14.44%
-末吉: 10.24%
-中平: 14.40%
-凶: 8.60%
-大凶: 7.09%
-

docs/main.js

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+var fs = require('fs')
+
+const goodFortunes = [
+    {
+      "event": "睡覺",
+      "description": "品質良好，精神煥發"
+    },
+    {
+      "event": "做家務",
+      "description": "整潔使人心情愉悅"
+    },
+    {
+      "event": "冥想",
+      "description": "平靜心靈，緩解焦慮"
+    },
+    {
+      "event": "攝影",
+      "description": "捕捉到美好瞬間"
+    },
+    {
+      "event": "喝咖啡",
+      "description": "精力充沛燃燒脂肪"
+    },
+    {
+      "event": "朋友聚會",
+      "description": "充滿歡笑和美好回憶"
+    },
+    {
+      "event": "體育鍛鍊",
+      "description": "能量滿滿，效果顯著"
+    },
+    {
+      "event": "出遊" ,
+      "description": "好天氣，好心情"
+    },
+    {
+      "event": "吃大餐",
+      "description": "聯絡感情"
+    },
+    {
+      "event": "逛書店",
+      "description": "新書上架，打折推銷"
+    },
+    {
+      "event": "學新技能",
+      "description": "快速上手"
+    },
+    {
+      "event": "唱歌",
+      "description": "被星探發掘"
+    },
+    {
+      "event": "上課",
+      "description": "整天不累，100% 消化"
+    },
+    {
+      "event": "洗澡",
+      "description": "重獲能量"
+    },
+    {
+      "event": "請教問題",
+      "description": "問題皆獲高人指點"
+    },
+    {
+      "event": "網購",
+      "description": "心儀商品皆促銷"
+    },
+    {
+      "event": "放假",
+      "description": "休息充電，明日再戰"
+    },
+    {
+      "event": "早睡",
+      "description": "好夢連連"
+    },
+    {
+      "event": "早起",
+      "description": "朝氣蓬勃，神采飛揚"
+    },
+    {
+      "event": "發文章",
+      "description": "瀏覽數暴增"
+    },
+    {
+      "event": "點外賣",
+      "description": "準時到達，新鮮好吃"
+    },
+    {
+      "event": "做善事",
+      "description": "積善成福"
+    },
+    {
+      "event": "散步",
+      "description": "空氣良好，放鬆身心"
+    }
+];
+
+const badFortunes =  [
+    {
+      "event": "體育鍛鍊",
+      "description": "不慎受傷"
+    },
+    {
+      "event": "攝影",
+      "description": "照片全消失"
+    },
+    {
+      "event": "出遊",
+      "description": "天氣不晴朗"
+    },
+    {
+      "event": "吃大餐",
+      "description": "被要求請客"
+    },
+    {
+      "event": "學新技能",
+      "description": "屢試不爽，始終不懂"
+    },
+    {
+      "event": "唱歌",
+      "description": "嗓子發炎"
+    },
+    {
+      "event": "洗澡",
+      "description": "水溫不穩"
+    },
+    {
+      "event": "請教問題",
+      "description": "疑難雜症，均無解答"
+    },
+    {
+      "event": "網購",
+      "description": "錯過促銷"
+    },
+    {
+      "event": "放假",
+      "description": "隔日工作量倍增"
+    },
+    {
+      "event": "晚睡",
+      "description": "失眠，明日精神渙散"
+    },
+    {
+      "event": "晚起",
+      "description": "整天都不順"
+    },
+    {
+      "event": "發文章",
+      "description": "搜索枯腸，不知所云"
+    },
+    {
+      "event": "點外賣",
+      "description": "路況壅塞，餐點冷掉"
+    },
+    {
+      "event": "喝咖啡",
+      "description": "晚上失眠"
+    },
+    {
+      "event": "散步",
+      "description": "被害蟲咬傷"
+    }
+];
+
+const badLen = badFortunes.length;
+const goodLen = goodFortunes.length;
+let num = null;
+const dates = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 30];
+const statusLen = 8;
+var buckets = {};
+let day = 0;
+var run_cnt = 0;
+
+while (run_cnt != 2000) {
+    let n1 = parseInt(Math.random() * 255 + 1);
+    let n2 = parseInt(Math.random() * 255 + 1);
+    let n3 = parseInt(Math.random() * 255 + 1);
+    let n4 = parseInt(Math.random() * 255 + 1);
+
+    if (!check_ip_valid(n1, n2, n3, n4)) continue;
+
+    let index = `${n1}.${n2}.${n3}.${n4}`;
+    // buckets[`${n1}.${n2}.${n3}.${n4}`] = [0, 0, 0, 0, 0, 0, 0, 0];
+    buckets[`${n1}.${n2}.${n3}.${n4}`] = [0, 0, 0, 0];
+    for (let i = 1; i <= 12; i++) {
+        for (let j = 1; j <= dates[i - 1]; j++) {
+            day %= 7;
+            run(2023, i, j, day, [n1, n2, n3, n4]);
+            day++;
+        }
+    }
+
+    run_cnt++;
+}
+
+fs.writeFile('./res.txt', JSON.stringify(buckets), err => {
+    console.log(err);
+});
+
+function check_ip_valid(n1, n2, n3, n4) {
+    if (n1 > 255 || n2 > 255 || n3 > 255 || n4 > 255) return false;
+
+    // private network
+    if (n1 === 10) return false;
+
+    // Carrier-grade NAT
+    if (n1 == 100 && n2 == 64) return false;
+
+    // localhost
+    if (n1 === 127 && n2 === 0 && n3 === 0) return false;
+
+    // link-local address
+    if (n1 == 169 && n2 == 254) return false;
+
+    // private network
+    if (n1 === 172) if (n2 >= 16 && n2 <= 31) return false;
+
+    if (n1 === 192) {
+        if (n2 === 168) return false; // private network
+        if (n2 === 0 && n3 === 0) return false; // IANA RFC 5735
+        if (n2 === 0 && n3 === 2) return false; // TEST-NET-1 RFC 5735
+        if (n2 === 88 && n3 === 99) return false; // 6to4
+    }
+
+    if (n1 == 198) {
+        if (n2 == 18) return false; // RFC 2544
+        if (n2 == 51 && n3 == 100) return false; // TEST-NET-2 RFC 5735
+    }
+
+    if (n1 == 203 && n3 == 113) return false; // TEST-NET-3 RFC 5735
+
+    // class D network
+    if (n1 == 224) return false;
+
+    // class E network
+    if (n1 == 255) return false;
+
+    return true;
+}
+
+// calculate hash and write result
+function run(year, month, date, day, ip) {
+    let num = ip;
+    let index = `${ip[0]}.${ip[1]}.${ip[2]}.${ip[3]}`;
+    let d = new Date(year, month, date);
+
+    // original hash function
+    let hashDate = Math.round(Math.log10(year * ((month << (Math.log10(num[3]) + day - 1)) * (date << Math.log10(num[2] << day)))));
+    let seed1 = (num[0] >> hashDate) * (num[1] >> Math.min(hashDate, 2)) + (num[2] << 1) * (num[3] >> 3) + (date << 3) * (month << hashDate) + ((year * day) >> 2);
+    let seed2 = (num[0] << (hashDate + 2)) * (num[1] << hashDate) + (num[2] << 1) * (num[3] << 3) + (date << (hashDate - 1)) * (month << 4) + (year >> hashDate) + ((date * day) >> 1);
+
+    // decide the status
+    let status_index = ((seed1 + seed2) % statusLen + statusLen) % statusLen;
+    // buckets[index][Math.max(status_index - parseInt(day / Math.PI), 0)]++; // old hash
+    // buckets[index][status_index]++; // current hash
+
+    // make sure the events won't collide
+    let set = new Set();
+    let l1 = (seed1 % goodLen + goodLen) % goodLen;
+    let l2 = (((seed1 << 1) + date) % goodLen + goodLen) % goodLen;
+
+    while (l1 == l2) {
+        l2 = (l2 + 1) % goodLen;
+    }
+
+    set.add(goodFortunes[l1].event);
+    set.add(goodFortunes[l2].event);
+
+    let r1 = (((seed1 >> 1) + (d.getMonth() << 3)) % badLen + badLen) % badLen;
+    while (set.has(badFortunes[r1].event)) {
+        r1 = (r1 + 2) % badLen;
+    }
+    set.add(badFortunes[r1].event);
+    let r2 = ((((((seed1 << 3) + (d.getFullYear() >> 5) * (date << 2)) % badLen) * seed2) >> 6) % badLen + badLen) % badLen;
+    while (set.has(badFortunes[r2].event)) {
+        r2 = (r2 + 1) % badLen;
+    }
+
+    // write l1, l2, r1, r2
+    buckets[index][0] = l1;
+    buckets[index][1] = l2;
+    buckets[index][2] = r1;
+    buckets[index][3] = r2;
+}