From bcdba20e095d1f8fa31fffe0715820ee2e4a2d74 Mon Sep 17 00:00:00 2001
From: Ferdinand <ferdinand@MacBook-Pro.local>
Date: Wed, 8 Apr 2026 13:22:48 +0200
Subject: [PATCH] feat: data tab with JSON load/save and history management

---
 js/history.js | 148 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 js/history.js

diff --git a/js/history.js b/js/history.js
new file mode 100644
index 0000000..34e24e6
--- /dev/null
+++ b/js/history.js
@@ -0,0 +1,148 @@
+import { state } from './app.js';
+import { loadFromJSON, saveToJSON, removeHistoryEntry } from './data.js';
+import { downloadBlob } from './excel.js';
+
+export function renderDataTab() {
+  const container = document.getElementById('tab-data');
+  container.replaceChildren();
+
+  const title = document.createElement('h2');
+  title.className = 'section-title';
+  title.textContent = 'Daten';
+  container.appendChild(title);
+
+  const grid = document.createElement('div');
+  grid.style.cssText = 'display:grid;grid-template-columns:1fr 1fr;gap:32px';
+
+  // Left: save/load
+  const saveLoadCol = document.createElement('div');
+
+  const saveTitle = document.createElement('h3');
+  saveTitle.style.cssText = 'margin-bottom:12px;font-size:15px';
+  saveTitle.textContent = 'Speichern / Laden';
+  saveLoadCol.appendChild(saveTitle);
+
+  const saveRow = document.createElement('div');
+  saveRow.className = 'row';
+  const saveBtn = document.createElement('button');
+  saveBtn.type = 'button';
+  saveBtn.className = 'primary';
+  saveBtn.textContent = 'Daten speichern (.json)';
+  saveRow.appendChild(saveBtn);
+  saveLoadCol.appendChild(saveRow);
+
+  const loadRow = document.createElement('div');
+  loadRow.className = 'row';
+  const loadBtn = document.createElement('button');
+  loadBtn.type = 'button';
+  loadBtn.textContent = 'Daten laden (.json)';
+  const fileInput = document.createElement('input');
+  fileInput.type = 'file';
+  fileInput.accept = '.json';
+  fileInput.style.display = 'none';
+  loadRow.append(loadBtn, fileInput);
+  saveLoadCol.appendChild(loadRow);
+
+  const hint = document.createElement('p');
+  hint.style.cssText = 'color:#6b7280;font-size:12px;margin-top:8px';
+  hint.textContent = 'Speichert Mitarbeiterliste, Einschränkungen und Verlauf. Beim nächsten Mal diese Datei laden.';
+  saveLoadCol.appendChild(hint);
+
+  // Right: history
+  const historyCol = document.createElement('div');
+  const historyTitle = document.createElement('h3');
+  historyTitle.style.cssText = 'margin-bottom:12px;font-size:15px';
+  historyTitle.textContent = 'Verlauf';
+  historyCol.appendChild(historyTitle);
+
+  const historyTable = document.createElement('div');
+  historyTable.id = 'history-table';
+  historyCol.appendChild(historyTable);
+
+  grid.append(saveLoadCol, historyCol);
+  container.appendChild(grid);
+
+  renderHistoryTable();
+
+  saveBtn.addEventListener('click', () => {
+    const blob = new Blob([saveToJSON(state)], { type: 'application/json' });
+    downloadBlob(blob, 'morning-planner-daten.json');
+  });
+
+  loadBtn.addEventListener('click', () => fileInput.click());
+
+  fileInput.addEventListener('change', async e => {
+    const file = e.target.files[0];
+    if (!file) return;
+    try {
+      const loaded = loadFromJSON(await file.text());
+      state.employees = loaded.employees;
+      state.calendar = loaded.calendar;
+      state.history = loaded.history;
+      alert('Daten erfolgreich geladen.');
+      renderDataTab();
+    } catch (err) {
+      alert('Fehler beim Laden: ' + err.message);
+    }
+    e.target.value = '';
+  });
+}
+
+function renderHistoryTable() {
+  const el = document.getElementById('history-table');
+  el.replaceChildren();
+
+  if (state.history.length === 0) {
+    const msg = document.createElement('p');
+    msg.style.cssText = 'color:#9ca3af;font-size:13px';
+    msg.textContent = 'Noch keine Einträge im Verlauf.';
+    el.appendChild(msg);
+    return;
+  }
+
+  const nameById = Object.fromEntries(state.employees.map(e => [e.id, e.name]));
+  const sorted = [...state.history].sort((a, b) => b.date.localeCompare(a.date));
+
+  const table = document.createElement('table');
+  const thead = document.createElement('thead');
+  const headRow = document.createElement('tr');
+  ['Datum','Mitarbeiter','Typ',''].forEach(txt => {
+    const th = document.createElement('th');
+    th.textContent = txt;
+    headRow.appendChild(th);
+  });
+  thead.appendChild(headRow);
+  table.appendChild(thead);
+
+  const tbody = document.createElement('tbody');
+  for (const h of sorted) {
+    const [y, m, d] = h.date.split('-');
+    const tr = document.createElement('tr');
+
+    const dateTd = document.createElement('td');
+    dateTd.textContent = d + '.' + m + '.' + y;
+
+    const nameTd = document.createElement('td');
+    nameTd.textContent = nameById[h.employeeId] ?? '(unbekannt)'; // textContent: safe
+
+    const typeTd = document.createElement('td');
+    typeTd.style.color = '#6b7280';
+    typeTd.textContent = h.manual ? 'Manuell' : 'Auto';
+
+    const actionTd = document.createElement('td');
+    const delBtn = document.createElement('button');
+    delBtn.type = 'button';
+    delBtn.textContent = '✕';
+    delBtn.style.cssText = 'font-size:11px;padding:2px 6px';
+    delBtn.addEventListener('click', () => {
+      removeHistoryEntry(state, h.date);
+      renderHistoryTable();
+    });
+    actionTd.appendChild(delBtn);
+
+    tr.append(dateTd, nameTd, typeTd, actionTd);
+    tbody.appendChild(tr);
+  }
+  table.appendChild(tbody);
+  el.appendChild(table);
+}