from __future__ import annotations

import argparse
import json
import sys
from pathlib import Path

from .llm import ollama_summary
from .logs import read_events, summarize_events
from .mitigation import FortiGateClient, parse_allowlist, suggest_block_candidates
from .policies import audit_policies, read_policies
from .syslog_server import listen_udp_syslog


def _print_json(data: object) -> None:
    print(json.dumps(data, indent=2, sort_keys=True))


def analyze_logs(args: argparse.Namespace) -> int:
    events = read_events(args.logs)
    candidates = suggest_block_candidates(
        events,
        min_events=args.min_events,
        min_score=args.min_score,
        allowlist=parse_allowlist(args.allowlist),
    )
    _print_json(
        {
            "summary": summarize_events(events),
            "block_candidates": [
                {"src_ip": candidate.src_ip, "score": candidate.score, "reasons": candidate.reasons}
                for candidate in candidates
            ],
        }
    )
    if args.llm:
        print("\nLLM summary:")
        print(ollama_summary([], candidates, args.model))
    return 0


def audit_policy_file(args: argparse.Namespace) -> int:
    findings = audit_policies(read_policies(args.config))
    _print_json([finding.__dict__ for finding in findings])
    if args.llm:
        print("\nLLM summary:")
        print(ollama_summary(findings, [], args.model))
    return 0


def suggest_blocks(args: argparse.Namespace) -> int:
    events = read_events(args.logs)
    candidates = suggest_block_candidates(
        events,
        min_events=args.min_events,
        min_score=args.min_score,
        allowlist=parse_allowlist(args.allowlist),
    )
    if not candidates:
        print("No block candidates met the current thresholds.")
        return 0

    for candidate in candidates:
        print(f"{candidate.src_ip} score={candidate.score} reasons={', '.join(candidate.reasons)}")
        if not args.execute:
            print("  dry-run: not blocked")
            continue
        client = FortiGateClient.from_env()
        reason = f"fgAI UTM mitigation score={candidate.score}"
        response = client.quarantine_ip(candidate.src_ip, args.expiry_minutes, reason)
        print(f"  blocked: {response}")
    return 0


def test_connection(args: argparse.Namespace) -> int:
    client = FortiGateClient.from_env()
    status = client.system_status()
    results = status.get("results", status)
    print("FortiGate API connection OK")
    _print_json(results)
    return 0


def fetch_policies(args: argparse.Namespace) -> int:
    client = FortiGateClient.from_env()
    policies = client.firewall_policies()
    if args.output:
        output = Path(args.output)
        output.parent.mkdir(parents=True, exist_ok=True)
        output.write_text(json.dumps(policies, indent=2, sort_keys=True), encoding="utf-8")
        print(f"Wrote {output}")
    else:
        _print_json(policies)
    return 0


def listen_syslog(args: argparse.Namespace) -> int:
    listen_udp_syslog(args.host, args.port, args.output)
    return 0


def build_parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(description="Local FortiGate AI/ML inspection tool")
    subparsers = parser.add_subparsers(required=True)

    logs = subparsers.add_parser("analyze-logs", help="Analyze local FortiGate logs")
    logs.add_argument("--logs", required=True, help="Path to syslog JSONL or key/value log file")
    logs.add_argument("--min-events", type=int, default=3)
    logs.add_argument("--min-score", type=int, default=7)
    logs.add_argument("--allowlist", default=None, help="Comma-separated IPs/CIDRs never to block")
    logs.add_argument("--llm", action="store_true", help="Ask local Ollama to summarize results")
    logs.add_argument("--model", default=None, help="Ollama model name")
    logs.set_defaults(func=analyze_logs)

    policies = subparsers.add_parser("audit-policies", help="Audit FortiOS firewall policy config")
    policies.add_argument("--config", required=True, help="Path to FortiOS config backup")
    policies.add_argument("--llm", action="store_true", help="Ask local Ollama to summarize results")
    policies.add_argument("--model", default=None, help="Ollama model name")
    policies.set_defaults(func=audit_policy_file)

    blocks = subparsers.add_parser("suggest-blocks", help="Suggest or execute guarded source IP blocks")
    blocks.add_argument("--logs", required=True, help="Path to syslog JSONL or key/value log file")
    blocks.add_argument("--min-events", type=int, default=3)
    blocks.add_argument("--min-score", type=int, default=7)
    blocks.add_argument("--allowlist", default=None, help="Comma-separated IPs/CIDRs never to block")
    blocks.add_argument("--execute", action="store_true", help="Actually call the FortiGate quarantine API")
    blocks.add_argument("--expiry-minutes", type=int, default=60)
    blocks.set_defaults(func=suggest_blocks)

    connection = subparsers.add_parser("test-connection", help="Test FortiGate REST API credentials")
    connection.set_defaults(func=test_connection)

    fetch = subparsers.add_parser("fetch-policies", help="Fetch firewall policies through the FortiGate REST API")
    fetch.add_argument("--output", help="Write JSON response to this file")
    fetch.set_defaults(func=fetch_policies)

    listener = subparsers.add_parser("listen-syslog", help="Listen for UDP syslog and append to a local log file")
    listener.add_argument("--host", default="0.0.0.0", help="Bind address")
    listener.add_argument("--port", type=int, default=5514, help="UDP port. Use 514 only with sudo/capability.")
    listener.add_argument("--output", default="logs/fg_syslog.jsonl", help="File to append received logs to")
    listener.set_defaults(func=listen_syslog)

    return parser


def main(argv: list[str] | None = None) -> int:
    parser = build_parser()
    args = parser.parse_args(argv)
    try:
        return args.func(args)
    except Exception as exc:
        print(f"fgai: {exc}", file=sys.stderr)
        return 1


if __name__ == "__main__":
    raise SystemExit(main())