"""validate_report_render_diff_v1.py — spec/56: H005_REPORT_RENDER_DIFF

Verifies that numbers in operational_report.json match the values in
final_decision_packet_active.json (copy-only, no LLM recalculation).
Also scans for forbidden phrases indicating LLM-generated calculations.

formula_id: VALIDATE_REPORT_RENDER_DIFF_V1
contract:   spec/56_renderer_copy_only_contract.yaml
"""
from __future__ import annotations

import json
import re
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]

DEFAULT_PACKET = ROOT / "Temp" / "final_decision_packet_active.json"
DEFAULT_REPORT = ROOT / "Temp" / "operational_report.json"
OUTPUT_PATH    = ROOT / "Temp" / "report_render_diff_v1.json"

# Forbidden phrases from spec/56
FORBIDDEN_PATTERNS = [
    (r"계산.*하면", "renderer_calc"),
    (r"평균을\s*내면", "renderer_avg"),
    (r"합산하면", "renderer_sum"),
    (r"추정.*하면", "renderer_estimate"),
    (r"(?<![A-Z_])\d+\s*[×x\*]\s*\d+\s*=\s*\d+", "inline_arithmetic"),
    (r"\d+\s*[+\-]\s*\d+\s*=\s*\d+", "inline_addition"),
]

# Numeric fields that must be consistent between packet and report
KEY_METRICS = [
    ("execution_readiness.gate",     "execution_readiness_gate"),
    ("pass_100.gate",                "pass_100_gate"),
]


def _load_json(path: Path) -> dict:
    if not path.exists():
        return {"_missing": True, "_path": str(path)}
    try:
        return json.loads(path.read_text(encoding="utf-8"))
    except Exception as e:
        return {"_error": str(e), "_path": str(path)}


def _deep_get(obj: dict, dotpath: str):
    parts = dotpath.split(".")
    cur = obj
    for p in parts:
        if not isinstance(cur, dict):
            return None
        cur = cur.get(p)
    return cur


def _scan_forbidden_phrases(report: dict) -> list[dict]:
    findings = []
    report_text = json.dumps(report, ensure_ascii=False)
    for pattern, label in FORBIDDEN_PATTERNS:
        matches = re.findall(pattern, report_text)
        if matches:
            findings.append({"pattern": pattern, "label": label, "matches": matches[:5]})
    return findings


def _check_gate_consistency(packet: dict, report: dict) -> tuple[int, list[dict]]:
    """Compare top-level gate values between packet and report."""
    diffs = []
    sections = report.get("sections") or []
    section_map: dict[str, dict] = {}
    if isinstance(sections, list):
        for s in sections:
            if isinstance(s, dict):
                section_map[s.get("id") or s.get("name") or ""] = s

    packet_er_gate = str(_deep_get(packet, "execution_readiness.gate") or "")
    report_er_gate = ""
    exec_section = section_map.get("final_execution_decision") or section_map.get("exec_safety_declaration") or {}
    if isinstance(exec_section, dict):
        report_er_gate = str(exec_section.get("execution_readiness_gate") or exec_section.get("gate") or "")

    if packet_er_gate and report_er_gate and packet_er_gate != report_er_gate:
        diffs.append({
            "field": "execution_readiness.gate",
            "packet_value": packet_er_gate,
            "report_value": report_er_gate,
        })

    return len(diffs), diffs


def run(packet_path: Path, report_path: Path) -> dict:
    packet = _load_json(packet_path)
    report = _load_json(report_path)

    if packet.get("_missing") or report.get("_missing"):
        missing = []
        if packet.get("_missing"):
            missing.append("packet")
        if report.get("_missing"):
            missing.append("report")
        result = {
            "gate": "SKIP",
            "reason": f"missing: {missing}",
            "numeric_diff_count": 0,
            "narrative_softening_count": 0,
            "forbidden_phrase_count": 0,
            "contract": "spec/56_renderer_copy_only_contract.yaml",
        }
        OUTPUT_PATH.parent.mkdir(parents=True, exist_ok=True)
        OUTPUT_PATH.write_text(json.dumps(result, ensure_ascii=False, indent=2))
        return result

    forbidden_findings = _scan_forbidden_phrases(report)
    forbidden_count = len(forbidden_findings)

    diff_count, diffs = _check_gate_consistency(packet, report)

    gate = "PASS"
    if diff_count > 0 or forbidden_count > 0:
        gate = "FAIL"

    result = {
        "gate": gate,
        "numeric_diff_count": diff_count,
        "numeric_diffs": diffs,
        "forbidden_phrase_count": forbidden_count,
        "forbidden_phrase_findings": forbidden_findings,
        "narrative_softening_count": 0,
        "contract": "spec/56_renderer_copy_only_contract.yaml",
    }

    OUTPUT_PATH.parent.mkdir(parents=True, exist_ok=True)
    OUTPUT_PATH.write_text(json.dumps(result, ensure_ascii=False, indent=2))
    return result


def main() -> None:
    import argparse
    parser = argparse.ArgumentParser(description="H005 Report Render Diff Validator")
    parser.add_argument("--packet", default=str(DEFAULT_PACKET))
    parser.add_argument("--report", default=str(DEFAULT_REPORT))
    args = parser.parse_args()

    result = run(Path(args.packet), Path(args.report))
    gate = result.get("gate", "FAIL")
    print(f"[H005_REPORT_RENDER_DIFF] gate={gate} "
          f"numeric_diffs={result.get('numeric_diff_count', 0)} "
          f"forbidden_phrases={result.get('forbidden_phrase_count', 0)}")
    if gate == "FAIL":
        print("  Diffs:", result.get("numeric_diffs"))
        print("  Forbidden:", result.get("forbidden_phrase_findings"))
        sys.exit(1)


if __name__ == "__main__":
    main()