From fe5abd6eb5b29c470229c739475b8d99c8969175 Mon Sep 17 00:00:00 2001
From: ethanfel <ethan.fel@ts-pc.fr>
Date: Fri, 2 Jan 2026 13:13:11 +0100
Subject: [PATCH] Create history_tree.py

---
 history_tree.py | 96 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 history_tree.py

diff --git a/history_tree.py b/history_tree.py
new file mode 100644
index 0000000..a514445
--- /dev/null
+++ b/history_tree.py
@@ -0,0 +1,96 @@
+import time
+import uuid
+
+class HistoryTree:
+    def __init__(self, raw_data):
+        self.nodes = raw_data.get("nodes", {})
+        self.branches = raw_data.get("branches", {"main": None}) 
+        self.head_id = raw_data.get("head_id", None)
+        
+        # Migration for legacy list-based history
+        if "prompt_history" in raw_data and isinstance(raw_data["prompt_history"], list) and not self.nodes:
+            self._migrate_legacy(raw_data["prompt_history"])
+
+    def _migrate_legacy(self, old_list):
+        parent = None
+        for item in reversed(old_list):
+            node_id = str(uuid.uuid4())[:8]
+            self.nodes[node_id] = {
+                "id": node_id, "parent": parent, "timestamp": time.time(),
+                "data": item, "note": item.get("note", "Legacy Import")
+            }
+            parent = node_id
+        self.branches["main"] = parent
+        self.head_id = parent
+
+    def commit(self, data, note="Snapshot"):
+        new_id = str(uuid.uuid4())[:8]
+        
+        # Logic: Are we at the tip of a branch?
+        active_branch = None
+        for b_name, tip_id in self.branches.items():
+            if tip_id == self.head_id:
+                active_branch = b_name
+                break
+        
+        # If not at a tip, we must FORK a new branch
+        if not active_branch:
+            base_name = "branch"
+            count = 1
+            while f"{base_name}_{count}" in self.branches: count += 1
+            active_branch = f"{base_name}_{count}"
+            
+        self.nodes[new_id] = {
+            "id": new_id, "parent": self.head_id, "timestamp": time.time(),
+            "data": data, "note": note
+        }
+        self.branches[active_branch] = new_id
+        self.head_id = new_id
+        return new_id
+
+    def checkout(self, node_id):
+        if node_id in self.nodes:
+            self.head_id = node_id
+            return self.nodes[node_id]["data"]
+        return None
+
+    def to_dict(self):
+        return {"nodes": self.nodes, "branches": self.branches, "head_id": self.head_id}
+
+    def generate_horizontal_graph(self):
+        """Generates a Fusion 360-style Horizontal Graph."""
+        dot = [
+            'digraph History {',
+            '  rankdir=LR;',  # Left-to-Right layout
+            '  node [shape=rect, style="filled,rounded", fontname="Arial", margin=0.2];',
+            '  edge [color="#888888", arrowsize=0.8];'
+        ]
+        
+        # Sort by time for linear flow
+        sorted_nodes = sorted(self.nodes.values(), key=lambda x: x["timestamp"])
+        
+        for n in sorted_nodes:
+            nid = n["id"]
+            note = n.get('note', 'Step')
+            label = f"{note}\\nid: {nid}"
+            
+            # Styling
+            color = "#e0e0e0" # Default Grey
+            penwidth = "1"
+            
+            # Active Node (HEAD) - Yellow
+            if nid == self.head_id:
+                color = "#ffeba0" 
+                penwidth = "3"
+            
+            # Branch Tips - Green
+            if nid in self.branches.values():
+                color = "#d0f0c0"
+            
+            dot.append(f'  "{nid}" [label="{label}", fillcolor="{color}", penwidth="{penwidth}"];')
+            
+            if n["parent"] and n["parent"] in self.nodes:
+                dot.append(f'  "{n["parent"]}" -> "{nid}";')
+                
+        dot.append("}")
+        return "\n".join(dot)