#!/usr/bin/env python3
"""Audit entity-propagation output against its base JSONL file.

The propagation step can be useful for recall, but it can also amplify noisy
surface forms across many documents. This script compares base and propagated
files record-by-record, summarizes added spans, and flags surfaces that need
manual review before using the propagated file for training.
"""
from __future__ import annotations

import argparse
import json
import re
from collections import Counter, defaultdict
from pathlib import Path
from typing import Any

Span = tuple[str, str, int, int]

GENERIC_SURFACES = {
    "account",
    "accounts",
    "admin",
    "android",
    "app",
    "application",
    "attack",
    "backdoor",
    "browser",
    "client",
    "code",
    "command",
    "computer",
    "data",
    "device",
    "devices",
    "domain",
    "download",
    "email",
    "exploit",
    "file",
    "files",
    "host",
    "install",
    "malware",
    "network",
    "payload",
    "process",
    "program",
    "registry",
    "remote",
    "script",
    "server",
    "service",
    "shell",
    "software",
    "system",
    "target",
    "trojan",
    "update",
    "user",
    "users",
    "version",
    "web",
    "windows",
}


def parse_spans(record: dict[str, Any]) -> set[Span]:
    spans = set()
    for key, offsets in (record.get("spans") or {}).items():
        if ": " not in key:
            continue
        label, surface = key.split(": ", 1)
        for start, end in offsets:
            spans.add((label, surface, int(start), int(end)))
    return spans


def load_jsonl(path: Path) -> list[dict[str, Any]]:
    with path.open(encoding="utf-8") as f:
        return [json.loads(line) for line in f if line.strip()]


def load_test_surfaces(paths: list[Path]) -> dict[str, set[str]]:
    surfaces: dict[str, set[str]] = defaultdict(set)
    for path in paths:
        if not path.exists():
            continue
        for rec in load_jsonl(path):
            for label, surface, _, _ in parse_spans(rec):
                surfaces[label].add(surface.lower())
    return surfaces


def flag_surface(label: str, surface: str, conflicts: set[str], test_seen: bool) -> list[str]:
    flags = []
    norm = surface.strip().lower()
    token_count = len(norm.split())
    if len(norm) < 4:
        flags.append("short")
    if norm in GENERIC_SURFACES:
        flags.append("generic")
    if token_count >= 6:
        flags.append("long")
    if re.fullmatch(r"[A-Za-z]+", surface) and surface.islower():
        flags.append("lowercase-word")
    if conflicts:
        flags.append("label-conflict")
    if test_seen:
        flags.append("seen-in-test")
    if label in {"Organization", "System", "Malware"} and token_count == 1 and norm in GENERIC_SURFACES:
        flags.append("high-risk-semantic")
    return flags


def main() -> None:
    parser = argparse.ArgumentParser(description="Audit propagated NER JSONL data")
    parser.add_argument("--base", required=True, type=Path)
    parser.add_argument("--propagated", required=True, type=Path)
    parser.add_argument("--test-data", nargs="*", type=Path, default=[])
    parser.add_argument("--json-out", type=Path, default=Path("results/entity_propagation_audit.json"))
    parser.add_argument("--md-out", type=Path, default=Path("results/entity_propagation_audit.md"))
    parser.add_argument("--max-samples", type=int, default=8)
    args = parser.parse_args()

    base = load_jsonl(args.base)
    prop = load_jsonl(args.propagated)
    if len(base) != len(prop):
        raise SystemExit(f"record count mismatch: base={len(base)} propagated={len(prop)}")

    original_surface_labels: dict[str, Counter[str]] = defaultdict(Counter)
    for rec in base:
        for label, surface, _, _ in parse_spans(rec):
            original_surface_labels[surface.lower()][label] += 1

    test_surfaces = load_test_surfaces(args.test_data)

    added_by_class: Counter[str] = Counter()
    original_by_class: Counter[str] = Counter()
    added_by_surface: Counter[tuple[str, str]] = Counter()
    flagged_by_reason: Counter[str] = Counter()
    flagged_by_class: Counter[str] = Counter()
    examples: dict[str, list[dict[str, Any]]] = defaultdict(list)
    total_added = 0
    records_with_added = 0

    for idx, (base_rec, prop_rec) in enumerate(zip(base, prop)):
        if base_rec.get("text") != prop_rec.get("text"):
            raise SystemExit(f"text mismatch at record {idx}")

        base_spans = parse_spans(base_rec)
        prop_spans = parse_spans(prop_rec)
        for label, _, _, _ in base_spans:
            original_by_class[label] += 1

        added = prop_spans - base_spans
        if added:
            records_with_added += 1

        for label, surface, start, end in added:
            total_added += 1
            added_by_class[label] += 1
            added_by_surface[(label, surface)] += 1

            labels_seen = set(original_surface_labels.get(surface.lower(), {}))
            conflicts = labels_seen - {label}
            test_seen = surface.lower() in test_surfaces.get(label, set())
            flags = flag_surface(label, surface, conflicts, test_seen)
            for flag in flags:
                flagged_by_reason[flag] += 1
            if flags:
                flagged_by_class[label] += 1
                key = ",".join(flags)
                if len(examples[key]) < args.max_samples:
                    text = prop_rec["text"]
                    examples[key].append(
                        {
                            "record": idx,
                            "label": label,
                            "surface": surface,
                            "offset": [start, end],
                            "flags": flags,
                            "context": text[max(0, start - 80) : min(len(text), end + 80)],
                        }
                    )

    top_surfaces = [
        {"label": label, "surface": surface, "added": count}
        for (label, surface), count in added_by_surface.most_common(50)
    ]
    high_risk_surfaces = [
        item
        for item in top_surfaces
        if flag_surface(
            item["label"],
            item["surface"],
            set(original_surface_labels.get(item["surface"].lower(), {})) - {item["label"]},
            item["surface"].lower() in test_surfaces.get(item["label"], set()),
        )
    ]

    summary = {
        "base": str(args.base),
        "propagated": str(args.propagated),
        "records": len(base),
        "records_with_added": records_with_added,
        "original_spans": sum(original_by_class.values()),
        "added_spans": total_added,
        "propagated_spans": sum(original_by_class.values()) + total_added,
        "original_by_class": dict(original_by_class),
        "added_by_class": dict(added_by_class),
        "flagged_by_reason": dict(flagged_by_reason),
        "flagged_by_class": dict(flagged_by_class),
        "top_added_surfaces": top_surfaces,
        "high_risk_top_surfaces": high_risk_surfaces[:30],
        "examples": examples,
    }

    args.json_out.parent.mkdir(parents=True, exist_ok=True)
    args.json_out.write_text(json.dumps(summary, indent=2, sort_keys=True), encoding="utf-8")

    lines = [
        "# Entity Propagation Audit",
        "",
        f"- Base: `{args.base}`",
        f"- Propagated: `{args.propagated}`",
        f"- Records: {len(base):,}",
        f"- Records with added spans: {records_with_added:,}",
        f"- Original spans: {sum(original_by_class.values()):,}",
        f"- Added spans: {total_added:,}",
        f"- Propagated total spans: {sum(original_by_class.values()) + total_added:,}",
        "",
        "## Added Spans By Class",
        "",
        "| Class | Original | Added | Added/Original |",
        "|---|---:|---:|---:|",
    ]
    for label in sorted(set(original_by_class) | set(added_by_class)):
        original = original_by_class[label]
        added = added_by_class[label]
        ratio = added / original if original else 0.0
        lines.append(f"| {label} | {original:,} | {added:,} | {ratio:.2f}x |")

    lines.extend(
        [
            "",
            "## Flags",
            "",
            "| Flag | Count |",
            "|---|---:|",
        ]
    )
    for flag, count in flagged_by_reason.most_common():
        lines.append(f"| {flag} | {count:,} |")

    lines.extend(
        [
            "",
            "## Top Added Surfaces",
            "",
            "| Label | Surface | Added |",
            "|---|---|---:|",
        ]
    )
    for item in top_surfaces[:25]:
        surface = item["surface"].replace("|", "\\|")
        lines.append(f"| {item['label']} | `{surface}` | {item['added']:,} |")

    lines.extend(
        [
            "",
            "## High-Risk Top Surfaces",
            "",
            "| Label | Surface | Added |",
            "|---|---|---:|",
        ]
    )
    for item in high_risk_surfaces[:25]:
        surface = item["surface"].replace("|", "\\|")
        lines.append(f"| {item['label']} | `{surface}` | {item['added']:,} |")

    args.md_out.parent.mkdir(parents=True, exist_ok=True)
    args.md_out.write_text("\n".join(lines) + "\n", encoding="utf-8")

    print(f"Records: {len(base):,}")
    print(f"Added spans: {total_added:,}")
    print(f"Audit JSON: {args.json_out}")
    print(f"Audit markdown: {args.md_out}")


if __name__ == "__main__":
    main()