Add Infinity_Vis_1 performance core

Infinity_Vis_1/infinity_vis_1/presets.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+from dataclasses import asdict, dataclass
+from datetime import datetime
+from pathlib import Path
+import json
+import re
+
+from .models import PatternParams, SceneState
+
+
+@dataclass(slots=True)
+class PresetRecord:
+    name: str
+    pattern_id: str
+    tempo_bpm: float
+    params: dict
+    created_at: str
+
+    @classmethod
+    def from_scene(cls, name: str, scene: SceneState) -> "PresetRecord":
+        return cls(
+            name=name,
+            pattern_id=scene.pattern_id,
+            tempo_bpm=scene.tempo_bpm,
+            params=asdict(scene.params),
+            created_at=datetime.utcnow().isoformat(timespec="seconds"),
+        )
+
+
+class PresetStore:
+    def __init__(self, root: str | Path) -> None:
+        self.root = Path(root)
+        self.root.mkdir(parents=True, exist_ok=True)
+
+    def save(self, record: PresetRecord) -> Path:
+        path = self.root / f"{slugify(record.name)}.json"
+        path.write_text(json.dumps(asdict(record), indent=2), encoding="utf-8")
+        return path
+
+    def list(self) -> list[PresetRecord]:
+        presets: list[PresetRecord] = []
+        for path in sorted(self.root.glob("*.json")):
+            try:
+                payload = json.loads(path.read_text(encoding="utf-8"))
+                presets.append(PresetRecord(**payload))
+            except (OSError, json.JSONDecodeError, TypeError):
+                continue
+        return presets
+
+    def load_scene(self, name: str) -> SceneState:
+        path = self.root / f"{slugify(name)}.json"
+        payload = json.loads(path.read_text(encoding="utf-8"))
+        record = PresetRecord(**payload)
+        return SceneState(
+            pattern_id=record.pattern_id,
+            tempo_bpm=float(record.tempo_bpm),
+            params=PatternParams(**record.params),
+        )
+
+
+def slugify(value: str) -> str:
+    return re.sub(r"[^a-z0-9]+", "-", value.lower()).strip("-") or "preset"