"""Plugin: AbuseIPDB IP reputation check and reporting."""

from __future__ import annotations

import asyncio
import ipaddress
import json
import logging
import os
import urllib.parse
import urllib.request

from derp.http import urlopen as _urlopen
from derp.plugin import command

log = logging.getLogger(__name__)

_API_BASE = "https://api.abuseipdb.com/api/v2"
_MAX_BATCH = 5


def _get_api_key(bot) -> str:
    """Resolve API key from environment or config."""
    return (os.environ.get("ABUSEIPDB_API_KEY", "")
            or bot.config.get("abuseipdb", {}).get("api_key", ""))


def _validate_ip(addr: str) -> str | None:
    """Validate IP address. Returns error string or None if valid."""
    try:
        ip = ipaddress.ip_address(addr)
    except ValueError:
        return f"invalid IP: {addr}"
    if ip.is_private or ip.is_loopback:
        return f"{addr}: private/loopback address"
    return None


def _check_ip(api_key: str, addr: str) -> dict:
    """Query AbuseIPDB check endpoint (blocking)."""
    url = f"{_API_BASE}/check?{urllib.parse.urlencode({'ipAddress': addr, 'maxAgeInDays': 90})}"
    req = urllib.request.Request(url, headers={
        "Key": api_key,
        "Accept": "application/json",
        "User-Agent": "derp-bot",
    })
    with _urlopen(req, timeout=15) as resp:
        return json.loads(resp.read())


def _report_ip(api_key: str, addr: str, categories: str, comment: str) -> dict:
    """Submit abuse report (blocking)."""
    data = urllib.parse.urlencode({
        "ip": addr,
        "categories": categories,
        "comment": comment,
    }).encode()
    req = urllib.request.Request(f"{_API_BASE}/report", data=data, headers={
        "Key": api_key,
        "Accept": "application/json",
        "User-Agent": "derp-bot",
    })
    with _urlopen(req, timeout=15) as resp:
        return json.loads(resp.read())


def _format_check(addr: str, data: dict) -> str:
    """Format check response into single-line output."""
    d = data.get("data", {})
    score = d.get("abuseConfidenceScore", "?")
    reports = d.get("totalReports", 0)
    isp = d.get("isp", "?")
    usage = d.get("usageType", "?")
    country = d.get("countryCode", "?")
    return (f"{addr} -- Abuse: {score}% ({reports} reports) | ISP: {isp}"
            f" | Usage: {usage} | Country: {country}")


@command("abuse", help="AbuseIPDB: !abuse <ip> [ip2 ...] | !abuse <ip> report <cats> <comment>")
async def cmd_abuse(bot, message):
    """Check or report IP addresses via AbuseIPDB.

    Usage:
        !abuse 8.8.8.8                        Check single IP
        !abuse 8.8.8.8 1.1.1.1               Check multiple IPs (max 5)
        !abuse 8.8.8.8 report 14,22 Brute force   Report IP (admin)
    """
    parts = message.text.split()
    if len(parts) < 2:
        usage = "Usage: !abuse <ip> [ip2 ...] | !abuse <ip> report <cats> <comment>"
        await bot.reply(message, usage)
        return

    api_key = _get_api_key(bot)
    if not api_key:
        await bot.reply(message, "AbuseIPDB API key not configured")
        return

    # Detect report mode: !abuse <ip> report <categories> <comment>
    if len(parts) >= 5 and parts[2].lower() == "report":
        if not bot._is_admin(message):
            await bot.reply(message, "Permission denied: reporting requires admin")
            return

        addr = parts[1]
        err = _validate_ip(addr)
        if err:
            await bot.reply(message, err)
            return

        categories = parts[3]
        comment = " ".join(parts[4:])
        loop = asyncio.get_running_loop()

        try:
            result = await loop.run_in_executor(
                None, _report_ip, api_key, addr, categories, comment,
            )
            score = result.get("data", {}).get("abuseConfidenceScore", "?")
            await bot.reply(message, f"{addr} -- reported (confidence: {score}%)")
        except Exception as exc:
            await bot.reply(message, f"{addr} -- report failed: {exc}")
        return

    # Check mode: collect IPs from arguments
    addrs = parts[1:1 + _MAX_BATCH]

    # Validate all
    for addr in addrs:
        err = _validate_ip(addr)
        if err:
            await bot.reply(message, err)
            return

    loop = asyncio.get_running_loop()

    async def _query(addr: str) -> str:
        try:
            result = await loop.run_in_executor(None, _check_ip, api_key, addr)
            return _format_check(addr, result)
        except Exception as exc:
            return f"{addr} -- error: {exc}"

    results = await asyncio.gather(*[_query(a) for a in addrs])
    await bot.long_reply(message, list(results), label="abuse check")