commit a760dc9964cf56664bf639c6316a0dbae54dc501
Author: Mika <kontakt@donau2space.de>
Date:   Sun Feb 1 17:56:58 2026 +0000

    Add rerun_analysis_tool/src/rerun_analysis_tool/core.py

diff --git a/rerun_analysis_tool/src/rerun_analysis_tool/core.py b/rerun_analysis_tool/src/rerun_analysis_tool/core.py
new file mode 100644
index 0000000..8015adb
--- /dev/null
+++ b/rerun_analysis_tool/src/rerun_analysis_tool/core.py
@@ -0,0 +1,101 @@
+from __future__ import annotations
+
+import logging
+from dataclasses import dataclass
+from typing import List, Dict, Any
+import pandas as pd
+
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class RunResult:
+    run_id: str
+    status: str
+    unknown_rate: float
+    rerun_helps: int
+    rerun_shifts: int
+    rerun_hurts: int
+
+
+class DataValidationError(Exception):
+    """Raised when the input data does not meet validation requirements."""
+    pass
+
+
+def _validate_runs_data(runs_data: List[Dict[str, Any]]) -> None:
+    required_fields = {"run_id", "status", "unknown_rate", "rerun_helps", "rerun_shifts", "rerun_hurts"}
+    for idx, entry in enumerate(runs_data):
+        if not isinstance(entry, dict):
+            raise DataValidationError(f"Entry {idx} is not a dict: {entry}")
+        missing = required_fields - set(entry.keys())
+        if missing:
+            raise DataValidationError(f"Entry {idx} missing fields: {missing}")
+        if not isinstance(entry["run_id"], str):
+            raise DataValidationError(f"run_id must be str, got {type(entry['run_id'])}")
+        if entry["status"] not in {"WARN", "PASS", "FAIL"}:
+            raise DataValidationError(f"Invalid status value: {entry['status']}")
+        for int_field in ["rerun_helps", "rerun_shifts", "rerun_hurts"]:
+            if not isinstance(entry[int_field], int):
+                raise DataValidationError(f"{int_field} must be int, got {type(entry[int_field])}")
+        if not isinstance(entry["unknown_rate"], (float, int)):
+            raise DataValidationError(f"unknown_rate must be float, got {type(entry['unknown_rate'])}")
+
+
+def analyze_runs(runs_data: List[Dict[str, Any]], threshold: float, rerun_budget: int) -> Dict[str, Any]:
+    """
+    Analysiert Replay-Daten zur Bestimmung der Auswirkungen von rerun_budget auf WARN-Verteilungen.
+
+    Args:
+        runs_data: Liste von Run-Dictionaries mit Feldern wie in RunResult.
+        threshold: WARN-Schwelle (z. B. 0.3 für 30%).
+        rerun_budget: Anzahl erlaubter Wiederholungen pro Run.
+
+    Returns:
+        Dictionary mit aggregierten Kennzahlen für rerun_helps, rerun_shifts und rerun_hurts.
+    """
+    logger.debug("Starting analyze_runs with threshold=%s and rerun_budget=%s", threshold, rerun_budget)
+    assert isinstance(runs_data, list), "runs_data must be a list"
+    assert isinstance(threshold, float), "threshold must be float"
+    assert isinstance(rerun_budget, int), "rerun_budget must be int"
+
+    # Validate input
+    _validate_runs_data(runs_data)
+
+    if not runs_data:
+        logger.warning("Empty runs_data received - returning zeros.")
+        return {"rerun_helps": 0, "rerun_shifts": 0, "rerun_hurts": 0}
+
+    # Convert to DataFrame for analysis
+    df = pd.DataFrame(runs_data)
+
+    # Compute fractions and apply threshold logic
+    df_filtered = df[df["unknown_rate"] <= threshold].copy()
+
+    rerun_helps_count = int((df_filtered["rerun_helps"] > 0).sum())
+    rerun_shifts_count = int((df_filtered["rerun_shifts"] > 0).sum())
+    rerun_hurts_count = int((df_filtered["rerun_hurts"] > 0).sum())
+
+    total = len(df_filtered)
+    logger.info(
+        "Rerun summary (filtered %s of %s): helps=%s, shifts=%s, hurts=%s",
+        total,
+        len(df),
+        rerun_helps_count,
+        rerun_shifts_count,
+        rerun_hurts_count,
+    )
+
+    result = {
+        "rerun_helps": rerun_helps_count,
+        "rerun_shifts": rerun_shifts_count,
+        "rerun_hurts": rerun_hurts_count,
+        "total_analyzed": total,
+        "threshold": threshold,
+        "rerun_budget": rerun_budget,
+    }
+
+    assert all(isinstance(v, (int, float)) for v in result.values() if v is not None), "All numeric fields must be valid"
+
+    return result