from __future__ import annotations
from dataclasses import dataclass, field
from datetime import datetime
from typing import Optional


@dataclass
class FieldResult:
    field_name: str = ""
    status: str = "PASS"
    cobol_value: str = ""
    java_value: str = ""
    tolerance_applied: float = 0.0
    rounding_detected: str = ""
    suggestion: str = ""


@dataclass
class VerificationRun:
    program: str = ""
    timestamp: str = ""
    status: str = "PASS"
    exit_code: int = 0
    duration_s: float = 0.0
    fields_matched: int = 0
    fields_mismatched: int = 0
    coverage_target: str = "boundary"
    field_results: list[FieldResult] = field(default_factory=list)
    runner: str = "native"
    branch_rate: float = 0.0
    llm_cost: float = 0.0
    report_path: str = ""
    debug: dict = field(default_factory=dict)

    def __post_init__(self):
        if not self.timestamp:
            self.timestamp = datetime.now().strftime("%Y%m%d-%H%M%S")

    @property
    def total_fields(self) -> int:
        return self.fields_matched + self.fields_mismatched

    def verdict(self) -> str:
        return self.status


_fr = FieldResult(field_name="BR-AMT", status="MISMATCH")
assert _fr.status == "MISMATCH"

_vr = VerificationRun(program="BILL-CALC", runner="spark")
assert _vr.program == "BILL-CALC"
assert _vr.timestamp != ""