init

app.js

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+import DB from "./db.js"
+
+// build parts
+const Part = {};
+function CreatePart(id, name)
+{
+    const part = {name, _:{id, time:0, work:[], need:[], make:[]}};
+    Part[id] = part;
+    return part;
+}
+CreatePart('p1', 'Part 1');
+CreatePart('p2', 'Part 2');
+CreatePart('p3', 'Part 3');
+
+
+// then build work
+const Work = [];
+function CreateWork(partId, user, time, data)
+{
+    const part = Part[partId];
+    const work = {user: user, time, data}
+    part._.work.push(work);
+    if(time > part._.time)
+    {
+        part._.time = time;
+    }
+    Work.push(work);
+    return work;
+}
+async function LoadWork()
+{
+    return await DB(import.meta.resolve('./db_work.csv'), 3, CreateWork);
+}
+await LoadWork();
+// CreateWork('p1', 'u1', 1, {key: 'value1'});
+// CreateWork('p1', 'u1', 2, {key: 'value2'});
+// CreateWork('p2', 'u2', 3, {key: 'value3'});
+// CreateWork('p2', 'u2', 4, {key: 'value4'});
+// CreateWork('p3', 'u2', 3, {key: 'valueDONE'});
+
+// then build desks
+const Desk = {};
+/** @type {(need:string[], make:string[])=>[dirtyNeed:string[], dirtyMake:string[], needMax:number, needMin:number]} */
+const Range =(need, make)=>
+{
+    const dirtyNeed = [];
+    const dirtyMake = [];
+
+    let makeMin = Infinity;
+    let needMax = -Infinity;
+    need.forEach(partId => {
+        const part = Part[partId];
+        if(part._.time > needMax) needMax = part._.time;
+    });
+
+    make.forEach(partId => {
+        const part = Part[partId];
+        if(part._.time < makeMin) makeMin = part._.time;
+        if(part._.time < needMax)
+        {
+            dirtyMake.push(partId);
+        }
+    });
+
+    need.forEach(partId => {
+        const part = Part[partId];
+        if(part._.time > makeMin)
+        {
+            dirtyNeed.push(partId);
+        }
+    });
+
+    return [dirtyNeed, dirtyMake, needMax, makeMin];
+};
+/** @type {(id:string, name:string, need:string[], make:string[], role:string[])=>void} */
+function CreateDesk(id, name, need, make, role)
+{
+    const desk = {name, need, make, role, _:{id}};
+    Desk[id] = desk;
+    need.forEach(partId => Part[partId]._.need.push(desk));
+    make.forEach(partId => Part[partId]._.make.push(desk));
+
+    const check = Range(need, make);
+    console.log(check);
+
+    return desk;
+}
+CreateDesk('d1', 'Desk 1', ['p1', 'p2'], ['p3'], ['role1']);
+
+
+
+console.log(Desk);

db.js

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+function createCSVScanner(onRow, nonJsonCols) {
+  let buffer = '';
+
+  return function scanChunk(chunk) {
+    buffer += chunk;
+    const lines = buffer.split('\n');
+    buffer = lines.pop(); // Save incomplete line
+
+    for (const line of lines) {
+      const fields = [];
+      let start = 0;
+      let commaCount = 0;
+
+      for (let i = 0; i < line.length; i++) {
+        if (line[i] === ',' && commaCount < nonJsonCols) {
+          fields.push(line.slice(start, i));
+          start = i + 1;
+          commaCount++;
+        }
+      }
+
+      // Push the remaining part as JSON string
+      const jsonStr = line.slice(start);
+      let jsonData = null;
+      try {
+        jsonData = JSON.parse(jsonStr);
+      } catch (_e) {
+        console.error('Invalid JSON:', jsonStr);
+      }
+      
+      onRow(...fields, jsonData);
+
+    }
+  };
+}
+
+export default async function(url, nonJsonCols, onRow) {
+    const response = await fetch(url);
+
+    if (!response.ok) {
+        throw new Error(`HTTP error! status: ${response.status}`);
+    }
+
+    const reader = response.body.getReader();
+    const decoder = new TextDecoder("utf-8");
+
+    const scanner = createCSVScanner(onRow, nonJsonCols);
+
+    while (true)
+    {
+        const { done, value } = await reader.read();
+        if (done) break;
+        const chunk = decoder.decode(value, { stream: true });
+        scanner(chunk);
+    }
+}

db_user.csv

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+seth trowbridge, seth111@gmail.com

db_work.csv

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+p1,u1,1,{"data":"value1"}
+p1,u1,2,{"data":"value2"}
+p2,u2,3,{"key1":"value3"}
+p2,u2,4,{"key1":"value4"}
+p3,u2,3,{"key1":"value5"}

db_work.json

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+{
+    "p1":{
+        "u1":{
+            "1":{"key1": "value1", "key2": "value2"}
+        }
+    }
+}