From b62cff80a12af3c15d2d8e8068f67562e260594d Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Sun, 1 Mar 2026 17:26:32 +0000
Subject: [PATCH] Add run_analysis/src/run_analysis/core.py

---
 run_analysis/src/run_analysis/core.py | 78 +++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 run_analysis/src/run_analysis/core.py

diff --git a/run_analysis/src/run_analysis/core.py b/run_analysis/src/run_analysis/core.py
new file mode 100644
index 0000000..20de896
--- /dev/null
+++ b/run_analysis/src/run_analysis/core.py
@@ -0,0 +1,78 @@
+from __future__ import annotations
+
+import json
+import logging
+from dataclasses import dataclass
+from typing import List, Dict, Any
+import statistics
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class RunData:
+    """Repräsentiert ein einzelnes Laufdaten-Objekt."""
+    corr_id: str
+    expires_at_dist_hours: float
+    visibility_lag: float
+
+    @staticmethod
+    def from_dict(data: Dict[str, Any]) -> 'RunData':
+        """Validiert und erstellt eine RunData-Instanz aus einem Dictionary."""
+        required_fields = ("corr_id", "expires_at_dist_hours", "visibility_lag")
+        for field in required_fields:
+            if field not in data:
+                raise ValueError(f"Missing required field '{field}' in RunData input.")
+        if not isinstance(data["corr_id"], str):
+            raise TypeError("'corr_id' must be a string.")
+        try:
+            exp_val = float(data["expires_at_dist_hours"])
+            vis_val = float(data["visibility_lag"])
+        except (TypeError, ValueError) as e:
+            raise ValueError("Numeric conversion failed for RunData fields.") from e
+
+        return RunData(
+            corr_id=data["corr_id"],
+            expires_at_dist_hours=exp_val,
+            visibility_lag=vis_val
+        )
+
+
+def analyze_run_data(run_data: List[RunData]) -> Dict[str, Any]:
+    """Analysiert Run-Daten und extrahiert Fälle mit Δt (visibility_lag) < 0.
+
+    Args:
+        run_data: Liste von RunData-Objekten.
+
+    Returns:
+        Dict mit Übersicht der negativen Δt-Fälle, inklusive Statistiken.
+    """
+    assert isinstance(run_data, list), "run_data must be a list of RunData instances"
+    if not run_data:
+        return {"total_records": 0, "negative_dt_count": 0, "neg_corr_ids": [], "summary": {}}
+
+    negative_cases = [r for r in run_data if r.visibility_lag < 0]
+    neg_corr_ids = [r.corr_id for r in negative_cases]
+
+    result: Dict[str, Any] = {
+        "total_records": len(run_data),
+        "negative_dt_count": len(negative_cases),
+        "neg_corr_ids": neg_corr_ids,
+        "summary": {}
+    }
+
+    if negative_cases:
+        exp_vals = [r.expires_at_dist_hours for r in negative_cases]
+        vis_vals = [r.visibility_lag for r in negative_cases]
+        try:
+            result["summary"] = {
+                "mean_expires_at_dist_hours": statistics.mean(exp_vals),
+                "mean_visibility_lag": statistics.mean(vis_vals),
+                "min_visibility_lag": min(vis_vals),
+                "max_visibility_lag": max(vis_vals)
+            }
+        except statistics.StatisticsError:
+            result["summary"] = {}
+
+    logger.debug("Analysis complete: %s", result)
+    return result