Chronos

"""
Chronos: Git-Backed Prompt Version Control & CI/CD Regression Guard
"""
from typing import Dict, Any, List
from pydantic import BaseModel, Field

class PromptCommit(BaseModel):
    version: str
    commit_sha: str
    template: str
    required_variables: List[str]

class CanaryGateResult(BaseModel):
    promoted: bool
    regression_score: float
    output_drift_pct: float
    active_version: str

class ChronosPromptManager:
    def __init__(self, baseline_version: str = "v1.4.0"):
        self.baseline_version = baseline_version

    def evaluate_candidate(self, commit: PromptCommit, golden_test_outputs: List[str], baseline_outputs: List[str]) -> CanaryGateResult:
        # Check variable AST completeness
        for var in commit.required_variables:
            if f"{{{var}}}" not in commit.template:
                return CanaryGateResult(promoted=False, regression_score=1.0, output_drift_pct=100.0, active_version=self.baseline_version)

        # Statistical drift comparison against golden dataset
        drift_count = sum(1 for c, b in zip(golden_test_outputs, baseline_outputs) if len(c) != len(b))
        drift_pct = (drift_count / max(1, len(golden_test_outputs))) * 100.0

        if drift_pct > 15.0:
            return CanaryGateResult(promoted=False, regression_score=0.85, output_drift_pct=drift_pct, active_version=self.baseline_version)

        return CanaryGateResult(promoted=True, regression_score=0.02, output_drift_pct=drift_pct, active_version=commit.version)