diff --git a/.gitignore b/.gitignore
index c87c9b3..ac28837 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+/html.html
+/json
+/hours.json
 # See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
 
 # dependencies
diff --git a/components/Timetable.tsx b/components/Timetable.tsx
index 975b5e1..3e6b3fa 100644
--- a/components/Timetable.tsx
+++ b/components/Timetable.tsx
@@ -1,5 +1,6 @@
 import React from "react";
 import { get, post } from "@/common";
+import { collection } from "@/store";
 
 interface Conflicts {
   [index: string]: HTMLInputElement[];
@@ -15,7 +16,24 @@ const indexToElement: IndexToElement = {};
 const conflicts: Conflicts = {};
 const marks: (HTMLInputElement | null)[][] = [];
 
-const Timetable = ({ user }) => {
+const downloadObjectAsJson = (exportObj: any, exportName: string) => {
+  const dataStr =
+    "data:text/json;charset=utf-8," +
+    encodeURIComponent(JSON.stringify(exportObj));
+  const downloadAnchorNode = document.createElement("a");
+  downloadAnchorNode.setAttribute("href", dataStr);
+  downloadAnchorNode.setAttribute("download", `${exportName}.json`);
+  document.body.appendChild(downloadAnchorNode); // required for firefox
+  downloadAnchorNode.click();
+  downloadAnchorNode.remove();
+};
+
+const Timetable = ({
+  user,
+  disableNetwork = false,
+  disableConflictCheck = false,
+  replaceInputType = "checkbox",
+}) => {
   const [editable, setEditable] = React.useState(true);
   const ref = React.useRef();
 
@@ -23,6 +41,8 @@ const Timetable = ({ user }) => {
     const target: HTMLInputElement = event.target;
     console.log("select", target.name, target.checked);
 
+    if (disableConflictCheck) return;
+
     const changedInputs: any = [];
     // find whether there are checked input in conflict
     for (const input of conflicts[target.name]) {
@@ -47,6 +67,9 @@ const Timetable = ({ user }) => {
         }
       }
     }
+
+    if (disableNetwork) return;
+
     // post request
     const json = await post("/api/record", {
       name: target.name,
@@ -74,11 +97,12 @@ const Timetable = ({ user }) => {
       return false;
     }
 
-    console.log(target.innerHTML);
-
     // turn off editable
     setEditable(false);
 
+    // empty marks
+    marks.length = 0;
+
     const table = target.children[0];
     table.setAttribute("border", "1");
 
@@ -105,7 +129,7 @@ const Timetable = ({ user }) => {
 
         // mount click event
         const input = document.createElement("input");
-        input.setAttribute("type", "checkbox");
+        input.setAttribute("type", replaceInputType);
         input.onchange = handleSelect;
         input.name = index;
         td.innerHTML = "";
@@ -115,6 +139,7 @@ const Timetable = ({ user }) => {
         row.push(input);
       }
       marks.push(row);
+      // console.log("marks", marks);
     }
 
     // resolve conflicts
@@ -156,13 +181,15 @@ const Timetable = ({ user }) => {
     }
   };
   React.useEffect(() => {
+    if (disableNetwork) return;
+
     const interval = setInterval(() => {
       refresh();
     }, 1000);
     return () => {
       clearInterval(interval);
     };
-  });
+  }, []);
 
   React.useEffect(() => {
     const main = async () => {
@@ -176,7 +203,27 @@ const Timetable = ({ user }) => {
 
   return (
     <>
-      <button onClick={refresh}>Test</button>
+      <button
+        onClick={async () => {
+          console.log("download marks", marks);
+          const data = {
+            user,
+            selections: {},
+          };
+          for (const row of marks) {
+            for (const input of row) {
+              if (input === null) continue;
+              if (input.value !== "") {
+                data.selections[input.name] = parseFloat(input.value);
+              }
+            }
+          }
+          console.log(data);
+          downloadObjectAsJson(data, user);
+        }}
+      >
+        DownloadSelection
+      </button>
       <span>Login as {user}</span>
       <div
         ref={ref}
@@ -186,6 +233,7 @@ const Timetable = ({ user }) => {
         }}
         onInput={handleInput}
       ></div>
+      <div style={{ display: "none" }} id="download-dom"></div>
     </>
   );
 };
diff --git a/package-lock.json b/package-lock.json
index 68d2879..e76251a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,12 +9,15 @@
       "version": "0.1.0",
       "dependencies": {
         "@next/font": "13.1.6",
+        "@types/glob": "^8.0.1",
         "@types/node": "18.11.18",
         "@types/react": "18.0.27",
         "@types/react-dom": "18.0.10",
         "esbuild": "^0.17.5",
         "eslint": "8.33.0",
         "eslint-config-next": "13.1.6",
+        "glob": "^8.1.0",
+        "mongodb": "5.0",
         "next": "13.1.6",
         "react": "18.2.0",
         "react-dom": "18.2.0",
@@ -420,6 +423,22 @@
         "glob": "7.1.7"
       }
     },
+    "node_modules/@next/eslint-plugin-next/node_modules/glob": {
+      "version": "7.1.7",
+      "resolved": "https://registry.npmmirror.com/glob/-/glob-7.1.7.tgz",
+      "integrity": "sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==",
+      "dependencies": {
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^3.0.4",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/@next/font": {
       "version": "13.1.6",
       "resolved": "https://registry.npmmirror.com/@next/font/-/font-13.1.6.tgz",
@@ -681,11 +700,25 @@
         "tslib": "^2.4.0"
       }
     },
+    "node_modules/@types/glob": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmmirror.com/@types/glob/-/glob-8.0.1.tgz",
+      "integrity": "sha512-8bVUjXZvJacUFkJXHdyZ9iH1Eaj5V7I8c4NdH5sQJsdXkqT4CA5Dhb4yb4VE/3asyx4L9ayZr1NIhTsWHczmMw==",
+      "dependencies": {
+        "@types/minimatch": "^5.1.2",
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/json5": {
       "version": "0.0.29",
       "resolved": "https://registry.npmmirror.com/@types/json5/-/json5-0.0.29.tgz",
       "integrity": "sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ=="
     },
+    "node_modules/@types/minimatch": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmmirror.com/@types/minimatch/-/minimatch-5.1.2.tgz",
+      "integrity": "sha512-K0VQKziLUWkVKiRVrx4a40iPaxTUefQmjtkQofBkYRcoaaL/8rhwDWww9qWbrgicNOgnpIsMxyNIUM4+n6dUIA=="
+    },
     "node_modules/@types/node": {
       "version": "18.11.18",
       "resolved": "https://registry.npmmirror.com/@types/node/-/node-18.11.18.tgz",
@@ -719,6 +752,20 @@
       "resolved": "https://registry.npmmirror.com/@types/scheduler/-/scheduler-0.16.2.tgz",
       "integrity": "sha512-hppQEBDmlwhFAXKJX2KnWLYu5yMfi91yazPb2l+lbJiwW+wdo1gNeRA+3RgNSO39WYX2euey41KEwnqesU2Jew=="
     },
+    "node_modules/@types/webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmmirror.com/@types/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-xTE1E+YF4aWPJJeUzaZI5DRntlkY3+BCVJi0axFptnjGmAoWxkyREIh/XMrfxVLejwQxMCfDXdICo0VLxThrog=="
+    },
+    "node_modules/@types/whatwg-url": {
+      "version": "8.2.2",
+      "resolved": "https://registry.npmmirror.com/@types/whatwg-url/-/whatwg-url-8.2.2.tgz",
+      "integrity": "sha512-FtQu10RWgn3D9U4aazdwIE2yzphmTJREDqNdODHrbrZmmMqI0vMheC/6NE/J1Yveaj8H+ela+YwWTjq5PGmuhA==",
+      "dependencies": {
+        "@types/node": "*",
+        "@types/webidl-conversions": "*"
+      }
+    },
     "node_modules/@typescript-eslint/parser": {
       "version": "5.50.0",
       "resolved": "https://registry.npmmirror.com/@typescript-eslint/parser/-/parser-5.50.0.tgz",
@@ -974,6 +1021,14 @@
         "node": ">=8"
       }
     },
+    "node_modules/bson": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmmirror.com/bson/-/bson-5.0.0.tgz",
+      "integrity": "sha512-EL2KpZdyhshyyptj6pnQfnFKPoncD9KwZYvgmj/FXQiOUU1HWTHWmBOP4TZXU3YzStcI5qgpIl68YnMo16s26A==",
+      "engines": {
+        "node": ">=14.20.1"
+      }
+    },
     "node_modules/call-bind": {
       "version": "1.0.2",
       "resolved": "https://registry.npmmirror.com/call-bind/-/call-bind-1.0.2.tgz",
@@ -1882,19 +1937,18 @@
       "integrity": "sha512-YCcF28IqSay3fqpIu5y3Krg/utCBHBeoflkZyHj/QcqI2nrLPC3ZegS9CmIo+hJb8K7aiGsuUl7PwWVjNG2HQQ=="
     },
     "node_modules/glob": {
-      "version": "7.1.7",
-      "resolved": "https://registry.npmmirror.com/glob/-/glob-7.1.7.tgz",
-      "integrity": "sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==",
+      "version": "8.1.0",
+      "resolved": "https://registry.npmmirror.com/glob/-/glob-8.1.0.tgz",
+      "integrity": "sha512-r8hpEjiQEYlF2QU0df3dS+nxxSIreXQS1qRhMJM0Q5NDdR386C7jb7Hwwod8Fgiuex+k0GFjgft18yvxm5XoCQ==",
       "dependencies": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
         "inherits": "2",
-        "minimatch": "^3.0.4",
-        "once": "^1.3.0",
-        "path-is-absolute": "^1.0.0"
+        "minimatch": "^5.0.1",
+        "once": "^1.3.0"
       },
       "engines": {
-        "node": "*"
+        "node": ">=12"
       }
     },
     "node_modules/glob-parent": {
@@ -1908,6 +1962,25 @@
         "node": ">=10.13.0"
       }
     },
+    "node_modules/glob/node_modules/brace-expansion": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmmirror.com/brace-expansion/-/brace-expansion-2.0.1.tgz",
+      "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "node_modules/glob/node_modules/minimatch": {
+      "version": "5.1.6",
+      "resolved": "https://registry.npmmirror.com/minimatch/-/minimatch-5.1.6.tgz",
+      "integrity": "sha512-lKwV/1brpG6mBUFHtb7NUmtABCb2WZZmm2wNiOA5hAb8VdCS4B3dtMWyvcoViccwAW/COERjXLt0zP1zXUN26g==",
+      "dependencies": {
+        "brace-expansion": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/globals": {
       "version": "13.20.0",
       "resolved": "https://registry.npmmirror.com/globals/-/globals-13.20.0.tgz",
@@ -2088,6 +2161,11 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/ip": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmmirror.com/ip/-/ip-2.0.0.tgz",
+      "integrity": "sha512-WKa+XuLG1A1R0UWhl2+1XQSi+fZWMsYKffMZTTYsiZaUD8k2yDAj5atimTUD2TZkyCkNEeYE5NhFZmupOGtjYQ=="
+    },
     "node_modules/is-arguments": {
       "version": "1.1.1",
       "resolved": "https://registry.npmmirror.com/is-arguments/-/is-arguments-1.1.1.tgz",
@@ -2449,6 +2527,12 @@
         "node": ">=10"
       }
     },
+    "node_modules/memory-pager": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmmirror.com/memory-pager/-/memory-pager-1.5.0.tgz",
+      "integrity": "sha512-ZS4Bp4r/Zoeq6+NLJpP+0Zzm0pR8whtGPf1XExKLJBAczGMnSi3It14OiNCStjQjM6NU1okjQGSxgEZN8eBYKg==",
+      "optional": true
+    },
     "node_modules/merge2": {
       "version": "1.4.1",
       "resolved": "https://registry.npmmirror.com/merge2/-/merge2-1.4.1.tgz",
@@ -2485,6 +2569,47 @@
       "resolved": "https://registry.npmmirror.com/minimist/-/minimist-1.2.7.tgz",
       "integrity": "sha512-bzfL1YUZsP41gmu/qjrEk0Q6i2ix/cVeAhbCbqH9u3zYutS1cLg00qhrD0M2MVdCcx4Sc0UpP2eBWo9rotpq6g=="
     },
+    "node_modules/mongodb": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmmirror.com/mongodb/-/mongodb-5.0.1.tgz",
+      "integrity": "sha512-KpjtY+NWFmcic6UDYEdfn768ZTuKyv7CRaui7ZSd6q/0/o1AURMC7KygTUwB1Cl8V10Pe5NiP+Y2eBMCDs/ygQ==",
+      "dependencies": {
+        "bson": "^5.0.0",
+        "mongodb-connection-string-url": "^2.6.0",
+        "socks": "^2.7.1"
+      },
+      "engines": {
+        "node": ">=14.20.1"
+      },
+      "optionalDependencies": {
+        "saslprep": "^1.0.3"
+      },
+      "peerDependencies": {
+        "@aws-sdk/credential-providers": "^3.201.0",
+        "mongodb-client-encryption": "^2.3.0",
+        "snappy": "^7.2.2"
+      },
+      "peerDependenciesMeta": {
+        "@aws-sdk/credential-providers": {
+          "optional": true
+        },
+        "mongodb-client-encryption": {
+          "optional": true
+        },
+        "snappy": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/mongodb-connection-string-url": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmmirror.com/mongodb-connection-string-url/-/mongodb-connection-string-url-2.6.0.tgz",
+      "integrity": "sha512-WvTZlI9ab0QYtTYnuMLgobULWhokRjtC7db9LtcVfJ+Hsnyr5eo6ZtNAt3Ly24XZScGMelOcGtm7lSn0332tPQ==",
+      "dependencies": {
+        "@types/whatwg-url": "^8.2.1",
+        "whatwg-url": "^11.0.0"
+      }
+    },
     "node_modules/ms": {
       "version": "2.1.2",
       "resolved": "https://registry.npmmirror.com/ms/-/ms-2.1.2.tgz",
@@ -2911,6 +3036,22 @@
         "rimraf": "bin.js"
       }
     },
+    "node_modules/rimraf/node_modules/glob": {
+      "version": "7.2.3",
+      "resolved": "https://registry.npmmirror.com/glob/-/glob-7.2.3.tgz",
+      "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
+      "dependencies": {
+        "fs.realpath": "^1.0.0",
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "^3.1.1",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/run-parallel": {
       "version": "1.2.0",
       "resolved": "https://registry.npmmirror.com/run-parallel/-/run-parallel-1.2.0.tgz",
@@ -2929,6 +3070,18 @@
         "is-regex": "^1.1.4"
       }
     },
+    "node_modules/saslprep": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmmirror.com/saslprep/-/saslprep-1.0.3.tgz",
+      "integrity": "sha512-/MY/PEMbk2SuY5sScONwhUDsV2p77Znkb/q3nSVstq/yQzYJOH/Azh29p9oJLsl3LnQwSvZDKagDGBsBwSooag==",
+      "optional": true,
+      "dependencies": {
+        "sparse-bitfield": "^3.0.3"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/scheduler": {
       "version": "0.23.0",
       "resolved": "https://registry.npmmirror.com/scheduler/-/scheduler-0.23.0.tgz",
@@ -2988,6 +3141,28 @@
         "node": ">=8"
       }
     },
+    "node_modules/smart-buffer": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmmirror.com/smart-buffer/-/smart-buffer-4.2.0.tgz",
+      "integrity": "sha512-94hK0Hh8rPqQl2xXc3HsaBoOXKV20MToPkcXvwbISWLEs+64sBq5kFgn2kJDHb1Pry9yrP0dxrCI9RRci7RXKg==",
+      "engines": {
+        "node": ">= 6.0.0",
+        "npm": ">= 3.0.0"
+      }
+    },
+    "node_modules/socks": {
+      "version": "2.7.1",
+      "resolved": "https://registry.npmmirror.com/socks/-/socks-2.7.1.tgz",
+      "integrity": "sha512-7maUZy1N7uo6+WVEX6psASxtNlKaNVMlGQKkG/63nEDdLOWNbiUMoLK7X4uYoLhQstau72mLgfEWcXcwsaHbYQ==",
+      "dependencies": {
+        "ip": "^2.0.0",
+        "smart-buffer": "^4.2.0"
+      },
+      "engines": {
+        "node": ">= 10.13.0",
+        "npm": ">= 3.0.0"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.0.2",
       "resolved": "https://registry.npmmirror.com/source-map-js/-/source-map-js-1.0.2.tgz",
@@ -2996,6 +3171,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/sparse-bitfield": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmmirror.com/sparse-bitfield/-/sparse-bitfield-3.0.3.tgz",
+      "integrity": "sha512-kvzhi7vqKTfkh0PZU+2D2PIllw2ymqJKujUcyPMd9Y75Nv4nPbGJZXNhxsgdQab2BmlDct1YnfQCguEvHr7VsQ==",
+      "optional": true,
+      "dependencies": {
+        "memory-pager": "^1.0.2"
+      }
+    },
     "node_modules/stop-iteration-iterator": {
       "version": "1.0.0",
       "resolved": "https://registry.npmmirror.com/stop-iteration-iterator/-/stop-iteration-iterator-1.0.0.tgz",
@@ -3155,6 +3339,17 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/tr46": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmmirror.com/tr46/-/tr46-3.0.0.tgz",
+      "integrity": "sha512-l7FvfAHlcmulp8kr+flpQZmVwtu7nfRV7NZujtN0OqES8EL4O4e0qqzL0DC5gAvx/ZC/9lk6rhcUwYvkBnBnYA==",
+      "dependencies": {
+        "punycode": "^2.1.1"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/tsconfig-paths": {
       "version": "3.14.1",
       "resolved": "https://registry.npmmirror.com/tsconfig-paths/-/tsconfig-paths-3.14.1.tgz",
@@ -3250,6 +3445,26 @@
         "punycode": "^2.1.0"
       }
     },
+    "node_modules/webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmmirror.com/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "11.0.0",
+      "resolved": "https://registry.npmmirror.com/whatwg-url/-/whatwg-url-11.0.0.tgz",
+      "integrity": "sha512-RKT8HExMpoYx4igMiVMY83lN6UeITKJlBQ+vR/8ZJ8OCdSiN3RwCq+9gH0+Xzj0+5IrM6i4j/6LuvzbZIQgEcQ==",
+      "dependencies": {
+        "tr46": "^3.0.0",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmmirror.com/which/-/which-2.0.2.tgz",
@@ -3518,6 +3733,21 @@
       "integrity": "sha512-o7cauUYsXjzSJkay8wKjpKJf2uLzlggCsGUkPu3lP09Pv97jYlekTC20KJrjQKmSv5DXV0R/uks2ZXhqjNkqAw==",
       "requires": {
         "glob": "7.1.7"
+      },
+      "dependencies": {
+        "glob": {
+          "version": "7.1.7",
+          "resolved": "https://registry.npmmirror.com/glob/-/glob-7.1.7.tgz",
+          "integrity": "sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==",
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        }
       }
     },
     "@next/font": {
@@ -3652,11 +3882,25 @@
         "tslib": "^2.4.0"
       }
     },
+    "@types/glob": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmmirror.com/@types/glob/-/glob-8.0.1.tgz",
+      "integrity": "sha512-8bVUjXZvJacUFkJXHdyZ9iH1Eaj5V7I8c4NdH5sQJsdXkqT4CA5Dhb4yb4VE/3asyx4L9ayZr1NIhTsWHczmMw==",
+      "requires": {
+        "@types/minimatch": "^5.1.2",
+        "@types/node": "*"
+      }
+    },
     "@types/json5": {
       "version": "0.0.29",
       "resolved": "https://registry.npmmirror.com/@types/json5/-/json5-0.0.29.tgz",
       "integrity": "sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ=="
     },
+    "@types/minimatch": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmmirror.com/@types/minimatch/-/minimatch-5.1.2.tgz",
+      "integrity": "sha512-K0VQKziLUWkVKiRVrx4a40iPaxTUefQmjtkQofBkYRcoaaL/8rhwDWww9qWbrgicNOgnpIsMxyNIUM4+n6dUIA=="
+    },
     "@types/node": {
       "version": "18.11.18",
       "resolved": "https://registry.npmmirror.com/@types/node/-/node-18.11.18.tgz",
@@ -3690,6 +3934,20 @@
       "resolved": "https://registry.npmmirror.com/@types/scheduler/-/scheduler-0.16.2.tgz",
       "integrity": "sha512-hppQEBDmlwhFAXKJX2KnWLYu5yMfi91yazPb2l+lbJiwW+wdo1gNeRA+3RgNSO39WYX2euey41KEwnqesU2Jew=="
     },
+    "@types/webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmmirror.com/@types/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-xTE1E+YF4aWPJJeUzaZI5DRntlkY3+BCVJi0axFptnjGmAoWxkyREIh/XMrfxVLejwQxMCfDXdICo0VLxThrog=="
+    },
+    "@types/whatwg-url": {
+      "version": "8.2.2",
+      "resolved": "https://registry.npmmirror.com/@types/whatwg-url/-/whatwg-url-8.2.2.tgz",
+      "integrity": "sha512-FtQu10RWgn3D9U4aazdwIE2yzphmTJREDqNdODHrbrZmmMqI0vMheC/6NE/J1Yveaj8H+ela+YwWTjq5PGmuhA==",
+      "requires": {
+        "@types/node": "*",
+        "@types/webidl-conversions": "*"
+      }
+    },
     "@typescript-eslint/parser": {
       "version": "5.50.0",
       "resolved": "https://registry.npmmirror.com/@typescript-eslint/parser/-/parser-5.50.0.tgz",
@@ -3882,6 +4140,11 @@
         "fill-range": "^7.0.1"
       }
     },
+    "bson": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmmirror.com/bson/-/bson-5.0.0.tgz",
+      "integrity": "sha512-EL2KpZdyhshyyptj6pnQfnFKPoncD9KwZYvgmj/FXQiOUU1HWTHWmBOP4TZXU3YzStcI5qgpIl68YnMo16s26A=="
+    },
     "call-bind": {
       "version": "1.0.2",
       "resolved": "https://registry.npmmirror.com/call-bind/-/call-bind-1.0.2.tgz",
@@ -4621,16 +4884,33 @@
       "integrity": "sha512-YCcF28IqSay3fqpIu5y3Krg/utCBHBeoflkZyHj/QcqI2nrLPC3ZegS9CmIo+hJb8K7aiGsuUl7PwWVjNG2HQQ=="
     },
     "glob": {
-      "version": "7.1.7",
-      "resolved": "https://registry.npmmirror.com/glob/-/glob-7.1.7.tgz",
-      "integrity": "sha512-OvD9ENzPLbegENnYP5UUfJIirTg4+XwMWGaQfQTY0JenxNvvIKP3U3/tAQSPIu/lHxXYSZmpXlUHeqAIdKzBLQ==",
+      "version": "8.1.0",
+      "resolved": "https://registry.npmmirror.com/glob/-/glob-8.1.0.tgz",
+      "integrity": "sha512-r8hpEjiQEYlF2QU0df3dS+nxxSIreXQS1qRhMJM0Q5NDdR386C7jb7Hwwod8Fgiuex+k0GFjgft18yvxm5XoCQ==",
       "requires": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
         "inherits": "2",
-        "minimatch": "^3.0.4",
-        "once": "^1.3.0",
-        "path-is-absolute": "^1.0.0"
+        "minimatch": "^5.0.1",
+        "once": "^1.3.0"
+      },
+      "dependencies": {
+        "brace-expansion": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmmirror.com/brace-expansion/-/brace-expansion-2.0.1.tgz",
+          "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+          "requires": {
+            "balanced-match": "^1.0.0"
+          }
+        },
+        "minimatch": {
+          "version": "5.1.6",
+          "resolved": "https://registry.npmmirror.com/minimatch/-/minimatch-5.1.6.tgz",
+          "integrity": "sha512-lKwV/1brpG6mBUFHtb7NUmtABCb2WZZmm2wNiOA5hAb8VdCS4B3dtMWyvcoViccwAW/COERjXLt0zP1zXUN26g==",
+          "requires": {
+            "brace-expansion": "^2.0.1"
+          }
+        }
       }
     },
     "glob-parent": {
@@ -4785,6 +5065,11 @@
         "side-channel": "^1.0.4"
       }
     },
+    "ip": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmmirror.com/ip/-/ip-2.0.0.tgz",
+      "integrity": "sha512-WKa+XuLG1A1R0UWhl2+1XQSi+fZWMsYKffMZTTYsiZaUD8k2yDAj5atimTUD2TZkyCkNEeYE5NhFZmupOGtjYQ=="
+    },
     "is-arguments": {
       "version": "1.1.1",
       "resolved": "https://registry.npmmirror.com/is-arguments/-/is-arguments-1.1.1.tgz",
@@ -5074,6 +5359,12 @@
         "yallist": "^4.0.0"
       }
     },
+    "memory-pager": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmmirror.com/memory-pager/-/memory-pager-1.5.0.tgz",
+      "integrity": "sha512-ZS4Bp4r/Zoeq6+NLJpP+0Zzm0pR8whtGPf1XExKLJBAczGMnSi3It14OiNCStjQjM6NU1okjQGSxgEZN8eBYKg==",
+      "optional": true
+    },
     "merge2": {
       "version": "1.4.1",
       "resolved": "https://registry.npmmirror.com/merge2/-/merge2-1.4.1.tgz",
@@ -5101,6 +5392,26 @@
       "resolved": "https://registry.npmmirror.com/minimist/-/minimist-1.2.7.tgz",
       "integrity": "sha512-bzfL1YUZsP41gmu/qjrEk0Q6i2ix/cVeAhbCbqH9u3zYutS1cLg00qhrD0M2MVdCcx4Sc0UpP2eBWo9rotpq6g=="
     },
+    "mongodb": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmmirror.com/mongodb/-/mongodb-5.0.1.tgz",
+      "integrity": "sha512-KpjtY+NWFmcic6UDYEdfn768ZTuKyv7CRaui7ZSd6q/0/o1AURMC7KygTUwB1Cl8V10Pe5NiP+Y2eBMCDs/ygQ==",
+      "requires": {
+        "bson": "^5.0.0",
+        "mongodb-connection-string-url": "^2.6.0",
+        "saslprep": "^1.0.3",
+        "socks": "^2.7.1"
+      }
+    },
+    "mongodb-connection-string-url": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmmirror.com/mongodb-connection-string-url/-/mongodb-connection-string-url-2.6.0.tgz",
+      "integrity": "sha512-WvTZlI9ab0QYtTYnuMLgobULWhokRjtC7db9LtcVfJ+Hsnyr5eo6ZtNAt3Ly24XZScGMelOcGtm7lSn0332tPQ==",
+      "requires": {
+        "@types/whatwg-url": "^8.2.1",
+        "whatwg-url": "^11.0.0"
+      }
+    },
     "ms": {
       "version": "2.1.2",
       "resolved": "https://registry.npmmirror.com/ms/-/ms-2.1.2.tgz",
@@ -5408,6 +5719,21 @@
       "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
       "requires": {
         "glob": "^7.1.3"
+      },
+      "dependencies": {
+        "glob": {
+          "version": "7.2.3",
+          "resolved": "https://registry.npmmirror.com/glob/-/glob-7.2.3.tgz",
+          "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.1.1",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        }
       }
     },
     "run-parallel": {
@@ -5428,6 +5754,15 @@
         "is-regex": "^1.1.4"
       }
     },
+    "saslprep": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmmirror.com/saslprep/-/saslprep-1.0.3.tgz",
+      "integrity": "sha512-/MY/PEMbk2SuY5sScONwhUDsV2p77Znkb/q3nSVstq/yQzYJOH/Azh29p9oJLsl3LnQwSvZDKagDGBsBwSooag==",
+      "optional": true,
+      "requires": {
+        "sparse-bitfield": "^3.0.3"
+      }
+    },
     "scheduler": {
       "version": "0.23.0",
       "resolved": "https://registry.npmmirror.com/scheduler/-/scheduler-0.23.0.tgz",
@@ -5472,11 +5807,34 @@
       "resolved": "https://registry.npmmirror.com/slash/-/slash-3.0.0.tgz",
       "integrity": "sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q=="
     },
+    "smart-buffer": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmmirror.com/smart-buffer/-/smart-buffer-4.2.0.tgz",
+      "integrity": "sha512-94hK0Hh8rPqQl2xXc3HsaBoOXKV20MToPkcXvwbISWLEs+64sBq5kFgn2kJDHb1Pry9yrP0dxrCI9RRci7RXKg=="
+    },
+    "socks": {
+      "version": "2.7.1",
+      "resolved": "https://registry.npmmirror.com/socks/-/socks-2.7.1.tgz",
+      "integrity": "sha512-7maUZy1N7uo6+WVEX6psASxtNlKaNVMlGQKkG/63nEDdLOWNbiUMoLK7X4uYoLhQstau72mLgfEWcXcwsaHbYQ==",
+      "requires": {
+        "ip": "^2.0.0",
+        "smart-buffer": "^4.2.0"
+      }
+    },
     "source-map-js": {
       "version": "1.0.2",
       "resolved": "https://registry.npmmirror.com/source-map-js/-/source-map-js-1.0.2.tgz",
       "integrity": "sha512-R0XvVJ9WusLiqTCEiGCmICCMplcCkIwwR11mOSD9CR5u+IXYdiseeEuXCVAjS54zqwkLcPNnmU4OeJ6tUrWhDw=="
     },
+    "sparse-bitfield": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmmirror.com/sparse-bitfield/-/sparse-bitfield-3.0.3.tgz",
+      "integrity": "sha512-kvzhi7vqKTfkh0PZU+2D2PIllw2ymqJKujUcyPMd9Y75Nv4nPbGJZXNhxsgdQab2BmlDct1YnfQCguEvHr7VsQ==",
+      "optional": true,
+      "requires": {
+        "memory-pager": "^1.0.2"
+      }
+    },
     "stop-iteration-iterator": {
       "version": "1.0.0",
       "resolved": "https://registry.npmmirror.com/stop-iteration-iterator/-/stop-iteration-iterator-1.0.0.tgz",
@@ -5595,6 +5953,14 @@
         "is-number": "^7.0.0"
       }
     },
+    "tr46": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmmirror.com/tr46/-/tr46-3.0.0.tgz",
+      "integrity": "sha512-l7FvfAHlcmulp8kr+flpQZmVwtu7nfRV7NZujtN0OqES8EL4O4e0qqzL0DC5gAvx/ZC/9lk6rhcUwYvkBnBnYA==",
+      "requires": {
+        "punycode": "^2.1.1"
+      }
+    },
     "tsconfig-paths": {
       "version": "3.14.1",
       "resolved": "https://registry.npmmirror.com/tsconfig-paths/-/tsconfig-paths-3.14.1.tgz",
@@ -5673,6 +6039,20 @@
         "punycode": "^2.1.0"
       }
     },
+    "webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmmirror.com/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g=="
+    },
+    "whatwg-url": {
+      "version": "11.0.0",
+      "resolved": "https://registry.npmmirror.com/whatwg-url/-/whatwg-url-11.0.0.tgz",
+      "integrity": "sha512-RKT8HExMpoYx4igMiVMY83lN6UeITKJlBQ+vR/8ZJ8OCdSiN3RwCq+9gH0+Xzj0+5IrM6i4j/6LuvzbZIQgEcQ==",
+      "requires": {
+        "tr46": "^3.0.0",
+        "webidl-conversions": "^7.0.0"
+      }
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmmirror.com/which/-/which-2.0.2.tgz",
diff --git a/package.json b/package.json
index 55d8ad4..d216179 100644
--- a/package.json
+++ b/package.json
@@ -11,12 +11,15 @@
   },
   "dependencies": {
     "@next/font": "13.1.6",
+    "@types/glob": "^8.0.1",
     "@types/node": "18.11.18",
     "@types/react": "18.0.27",
     "@types/react-dom": "18.0.10",
     "esbuild": "^0.17.5",
     "eslint": "8.33.0",
     "eslint-config-next": "13.1.6",
+    "glob": "^8.1.0",
+    "mongodb": "5.0",
     "next": "13.1.6",
     "react": "18.2.0",
     "react-dom": "18.2.0",
diff --git a/pages/api/tool.ts b/pages/api/tool.ts
new file mode 100644
index 0000000..9c85632
--- /dev/null
+++ b/pages/api/tool.ts
@@ -0,0 +1,101 @@
+import type { NextApiRequest, NextApiResponse } from "next";
+import fs from "fs";
+import { store, html } from "@/store";
+import glob from "glob";
+import { promisify } from "util";
+const g = promisify(glob);
+const read = promisify(fs.readFile);
+
+// 索引与工时
+const indexToHour: Record<string, number> = JSON.parse(
+  fs.readFileSync("./hours.json", "utf8")
+).selections;
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse<Record<string, string>>
+) {
+  // 读入全部json文件
+  // users: {姓名: {坐标: 权重}}
+  const users: Record<string, Record<string, number>> = {};
+  const files = await g("./json/*.json");
+  for (const file of files) {
+    const jsonStr = await read(file, "utf8");
+    const json: {
+      user: string;
+      selections: Record<string, number>;
+    } = JSON.parse(jsonStr);
+
+    // Normalization
+    // 使用 标准分数 算法 z = (x - mean) / std
+    const { selections } = json;
+    const nums = Object.values(selections);
+    const mean = nums.reduce((a, b) => a + b) / nums.length;
+    const std = Math.sqrt(
+      nums.map((x) => Math.pow(x - mean, 2)).reduce((a, b) => a + b) /
+        nums.length
+    );
+    const normalizedNums = nums.map((x) => (std === 0 ? 0 : (x - mean) / std));
+    for (const index in selections) {
+      selections[index] = std === 0 ? 0 : (selections[index] - mean) / std;
+    }
+    users[json.user] = selections;
+  }
+  // 计算每一个格子有多少人选择
+  // counts: {坐标: {姓名: 权重}}
+  const counts: Record<string, Record<string, Record<string, number>>> = {};
+  for (const user in users) {
+    for (const select in users[user]) {
+      if (counts[select] === undefined) counts[select] = {};
+      counts[select][user] = users[user];
+    }
+  }
+
+  // 构造返回数据, key 为 坐标，value 为姓名
+  const resp: Record<string, string> = {};
+
+  // 找到选择数量最少的格子
+  // sortable: [[坐标, 选择人数]]
+  // 如果遇到选择数量相同的格子，随机打乱顺序进行迭代
+  const sortable: [string, number][] = [];
+  for (const index in counts) {
+    sortable.push([index, Object.keys(counts[index]).length]);
+  }
+  sortable.sort((a, b) => a[1] - b[1] || Math.random() - 0.5);
+
+  // 记录这个人的出现次数,还有这个人的工时总数
+  const hoursCount: Record<string, number> = {};
+
+  for (const [smallestIndex, _] of sortable) {
+    // console.log("smallestIndex", smallestIndex);
+    // console.log("cell", counts[smallestIndex]);
+    // 找到格子里权重最低的人选 [姓名, 小时数, 出现次数, 权重]
+    const weightList: [string, number, number][] = [];
+    for (const user in counts[smallestIndex]) {
+      weightList.push([
+        user,
+        hoursCount[user] || 0,
+        counts[smallestIndex][user][smallestIndex],
+      ]);
+    }
+    weightList.sort((a, b) => a[1] - b[1] || a[2] - b[2]);
+    // console.log("weightList", weightList);
+    const theChoosenUser = weightList[0][0];
+    // console.log("theChoosenUser", theChoosenUser);
+    // 记录结果
+    resp[smallestIndex] = theChoosenUser;
+    hoursCount[theChoosenUser] =
+      (hoursCount[theChoosenUser] || 0) + indexToHour[smallestIndex];
+  }
+  // console.log("hoursCount", hoursCount);
+
+  const sortedHoursCount: [string, number][] = [];
+  for (const user in hoursCount) {
+    sortedHoursCount.push([user, hoursCount[user]]);
+  }
+  sortedHoursCount.sort((a, b) => a[1] - b[1]);
+  console.log("sortedHoursCount", sortedHoursCount);
+  console.log("sortedHoursCount.length", sortedHoursCount.length);
+
+  res.status(200).json(resp);
+}
diff --git a/pages/report-tool.tsx b/pages/report-tool.tsx
new file mode 100644
index 0000000..f8a845b
--- /dev/null
+++ b/pages/report-tool.tsx
@@ -0,0 +1,50 @@
+import React from "react";
+import Head from "next/head";
+
+const ReportPage = () => {
+  const ref = React.useRef();
+  const getReport = async () => {
+    const resp = await fetch("/api/html").then((resp) => resp.json());
+    ref.current.innerHTML = resp.html;
+    const json: Record<string, string> = await fetch("/api/tool").then(
+      (resp) => resp.json()
+    );
+    const table = ref.current.children[0];
+    const tbody = table.children[table.children.length - 1];
+    for (const tr_index in tbody.children) {
+      const tr = tbody.children[tr_index];
+      for (const td_index in tr.children) {
+        const td = tr.children[td_index];
+        if (td.tagName !== "TD") continue;
+        const index = `${tr_index},${td_index}`;
+        if (json[index] === undefined) continue;
+        td.innerHTML = json[index];
+      }
+    }
+  };
+  React.useEffect(() => {
+    getReport();
+  }, []);
+  return (
+    <>
+      <Head>
+        <title>Create Next App</title>
+        <meta name="description" content="Generated by create next app" />
+        <meta name="viewport" content="width=device-width, initial-scale=1" />
+        <link rel="icon" href="/favicon.ico" />
+      </Head>
+      <main>
+        <button onClick={async () => getReport()}>Refresh</button>
+        <div
+          ref={ref}
+          onInput={(event) => {
+            console.log(event.currentTarget.innerHTML);
+          }}
+          contentEditable="true"
+        ></div>
+      </main>
+    </>
+  );
+};
+
+export default ReportPage;
\ No newline at end of file
diff --git a/pages/tool.tsx b/pages/tool.tsx
new file mode 100644
index 0000000..66b074a
--- /dev/null
+++ b/pages/tool.tsx
@@ -0,0 +1,55 @@
+import React from "react";
+import Head from "next/head";
+import Timetable from "@/components/Timetable";
+
+export default function Home() {
+  const [user, setUser] = React.useState("");
+  const [begin, setBegin] = React.useState(false);
+
+  React.useEffect(() => {
+    setUser(localStorage.getItem("user") || "");
+  }, []);
+
+  return (
+    <>
+      <Head>
+        <title>Create Next App</title>
+        <meta name="description" content="Generated by create next app" />
+        <meta name="viewport" content="width=device-width, initial-scale=1" />
+        <link rel="icon" href="/favicon.ico" />
+      </Head>
+      <main>
+        {!begin && (
+          <div>
+            <input
+              placeholder="在这输你的名字"
+              value={user}
+              onChange={(event) => setUser(event.target.value)}
+            />
+            <button
+              onClick={() => {
+                if (user.trim() === "") {
+                  alert("姓名不能为空");
+                  return;
+                }
+                setUser(user.trim());
+                setBegin(true);
+                localStorage.setItem("user", user);
+              }}
+            >
+              Login
+            </button>
+          </div>
+        )}
+        {begin && (
+          <Timetable
+            user={user}
+            disableConflictCheck={true}
+            disableNetwork={true}
+            replaceInputType={"number"}
+          />
+        )}
+      </main>
+    </>
+  );
+}
diff --git a/store/index.ts b/store/index.ts
index 53f4c1f..7c21592 100644
--- a/store/index.ts
+++ b/store/index.ts
@@ -1,3 +1,10 @@
+import fs from "fs";
+import { MongoClient } from "mongodb";
+import util from "util";
+
+const write = util.promisify(fs.writeFile);
+const read = util.promisify(fs.readFile);
+
 class Store {
   record: Record<string, string>;
   constructor() {
@@ -27,13 +34,20 @@ class Store {
 class HTML {
   html: string;
   constructor() {
-    this.html = "";
+    // load from file
+    try {
+      this.html = fs.readFileSync("./html.html", "utf8");
+    } catch {
+      this.html = "";
+    }
   }
   public get() {
     return this.html;
   }
-  public set(html) {
+  public async set(html: string) {
     this.html = html;
+    // store into file
+    await write("./html.html", html, "utf8");
   }
 }