#!/usr/bin/env python3
"""Zabbix collector for NetBox via Diode SDK.

Pulls device inventory from Zabbix API for brownfield import into NetBox.
Also adds Zabbix host IDs as custom fields for cross-referencing.

Usage:
    python collectors/zabbix_collector.py --dry-run
    python collectors/zabbix_collector.py
"""

import argparse
import logging
import os
import sys

from pyzabbix import ZabbixAPI

from netboxlabs.diode.sdk import DiodeClient, DiodeDryRunClient
from netboxlabs.diode.sdk.ingester import (
    CustomFieldValue,
    Device,
    DeviceRole,
    DeviceType,
    Entity,
    Interface,
    IPAddress,
    Manufacturer,
    Platform,
    Site,
)

log = logging.getLogger("zabbix-collector")

# ---------------------------------------------------------------------------
# Zabbix → NetBox mappings
# ---------------------------------------------------------------------------

ZABBIX_STATUS_MAP = {
    0: "active",      # Monitored
    1: "offline",     # Unmonitored
}

ZABBIX_IFACE_TYPE = {
    1: "agent",       # Zabbix agent
    2: "snmp",        # SNMP
    3: "ipmi",        # IPMI
    4: "jmx",         # JMX
}

# Best-effort OS → Platform mapping from Zabbix template groups
OS_KEYWORDS_TO_PLATFORM = {
    "linux": "Linux",
    "windows": "Windows",
    "cisco": "Cisco IOS",
    "juniper": "Juniper Junos",
    "freebsd": "FreeBSD",
    "vmware": "VMware ESXi",
    "proxmox": "Proxmox VE",
    "ubuntu": "Ubuntu",
    "debian": "Debian",
    "centos": "CentOS",
    "rhel": "Red Hat Enterprise Linux",
}


# ---------------------------------------------------------------------------
# Configuration
# ---------------------------------------------------------------------------


def load_dotenv(path: str = ".env") -> None:
    if not os.path.isfile(path):
        return
    with open(path) as fh:
        for line in fh:
            line = line.strip()
            if not line or line.startswith("#") or "=" not in line:
                continue
            key, _, val = line.partition("=")
            os.environ.setdefault(key.strip(), val.strip().strip("\"'"))


def get_config() -> dict:
    return {
        "url": os.environ.get("ZABBIX_URL", ""),
        "user": os.environ.get("ZABBIX_USER", "Admin"),
        "password": os.environ.get("ZABBIX_PASSWORD", ""),
        "api_token": os.environ.get("ZABBIX_API_TOKEN", ""),
        "site": os.environ.get("ZABBIX_SITE", "main"),
        "default_role": os.environ.get("ZABBIX_DEFAULT_ROLE", "Server"),
        "group_to_role": {},  # Could be loaded from config
    }


# ---------------------------------------------------------------------------
# Device reference helper
# ---------------------------------------------------------------------------


def _device_ref(name: str, model: str, manufacturer: str, role: str,
                site_name: str) -> Device:
    return Device(
        name=name,
        device_type=DeviceType(
            model=model,
            manufacturer=Manufacturer(name=manufacturer),
        ),
        role=DeviceRole(name=role),
        site=Site(name=site_name),
    )


# ---------------------------------------------------------------------------
# Data collection
# ---------------------------------------------------------------------------


def connect_zabbix(cfg: dict) -> ZabbixAPI:
    url = cfg["url"]
    if not url:
        log.error("ZABBIX_URL not set")
        sys.exit(1)

    zapi = ZabbixAPI(url)
    zapi.session.verify = False

    if cfg.get("api_token"):
        zapi.login(api_token=cfg["api_token"])
    else:
        zapi.login(cfg["user"], cfg["password"])

    log.info("Connected to Zabbix %s", zapi.api_version())
    return zapi


def collect_hosts(zapi: ZabbixAPI) -> list[dict]:
    """Fetch all hosts with their interfaces and inventory data."""
    hosts = zapi.host.get(
        output=["hostid", "host", "name", "status", "description"],
        selectInterfaces=["interfaceid", "ip", "dns", "port", "type", "main", "useip"],
        selectInventory="extend",
        selectGroups=["name"],
        selectParentTemplates=["name"],
    )
    log.info("Fetched %d hosts from Zabbix", len(hosts))
    return hosts


# ---------------------------------------------------------------------------
# Entity builders
# ---------------------------------------------------------------------------


def guess_platform(host_data: dict) -> str | None:
    """Try to guess platform from Zabbix templates/groups/inventory."""
    # Check inventory OS field
    inventory = host_data.get("inventory") or {}
    if isinstance(inventory, dict):
        os_full = inventory.get("os_full") or inventory.get("os_short") or ""
        for keyword, platform in OS_KEYWORDS_TO_PLATFORM.items():
            if keyword.lower() in os_full.lower():
                return platform

    # Check template names
    templates = host_data.get("parentTemplates") or []
    for tmpl in templates:
        tmpl_name = (tmpl.get("name") or "").lower()
        for keyword, platform in OS_KEYWORDS_TO_PLATFORM.items():
            if keyword in tmpl_name:
                return platform

    return None


def guess_role(host_data: dict, default_role: str) -> str:
    """Try to guess device role from Zabbix groups."""
    groups = host_data.get("groups") or []
    for group in groups:
        gname = (group.get("name") or "").lower()
        if "router" in gname:
            return "Router"
        if "switch" in gname:
            return "Switch"
        if "firewall" in gname:
            return "Firewall"
        if "hypervisor" in gname:
            return "Hypervisor"
        if "server" in gname or "linux" in gname or "windows" in gname:
            return "Server"
    return default_role


def build_host_entities(host_data: dict, cfg: dict) -> list[Entity]:
    """Build Device + Interface + IPAddress entities from a Zabbix host."""
    entities = []
    site_name = cfg["site"]
    default_role = cfg["default_role"]

    hostname = host_data.get("name") or host_data.get("host", "unknown")
    status = ZABBIX_STATUS_MAP.get(int(host_data.get("status", 0)), "active")
    host_id = host_data.get("hostid", "")

    # Inventory data
    inventory = host_data.get("inventory") or {}
    if isinstance(inventory, list):
        inventory = {}
    serial = inventory.get("serialno_a") or ""
    model = inventory.get("model") or inventory.get("hardware") or "Unknown"
    vendor = inventory.get("vendor") or inventory.get("hardware_full") or "Unknown"
    asset_tag = inventory.get("asset_tag") or ""

    role = guess_role(host_data, default_role)
    platform = guess_platform(host_data)

    # Custom fields for cross-referencing
    custom_fields = {}
    if host_id:
        custom_fields["zabbix_host_id"] = CustomFieldValue(text=str(host_id))

    # Device entity
    device_kwargs = dict(
        name=hostname,
        device_type=DeviceType(
            model=model,
            manufacturer=Manufacturer(name=vendor),
        ),
        role=DeviceRole(name=role),
        site=Site(name=site_name),
        status=status,
        serial=serial[:50] if serial else "",
        asset_tag=asset_tag[:50] if asset_tag else "",
        tags=["zabbix"],
    )
    if platform:
        device_kwargs["platform"] = Platform(name=platform)
    if custom_fields:
        device_kwargs["custom_fields"] = custom_fields

    entities.append(Entity(device=Device(**device_kwargs)))

    # Interface + IP entities from Zabbix interfaces
    dev_ref = _device_ref(hostname, model, vendor, role, site_name)
    primary_ip = None

    for iface in host_data.get("interfaces", []):
        iface_type_num = int(iface.get("type", 1))
        iface_type_name = ZABBIX_IFACE_TYPE.get(iface_type_num, "agent")
        ip = iface.get("ip", "")
        is_main = str(iface.get("main", "0")) == "1"

        if not ip or ip == "0.0.0.0":
            continue

        # Interface name based on type
        iface_name = f"zabbix-{iface_type_name}"
        if is_main and iface_type_name == "agent":
            iface_name = "mgmt0"
        elif iface_type_name == "snmp":
            iface_name = "snmp0"
        elif iface_type_name == "ipmi":
            iface_name = "ipmi0"

        entities.append(Entity(interface=Interface(
            device=dev_ref,
            name=iface_name,
            type="other",
            enabled=True,
            tags=["zabbix"],
        )))

        # IP address
        ip_str = f"{ip}/32"  # Zabbix doesn't provide prefix length
        entities.append(Entity(ip_address=IPAddress(
            address=ip_str,
            status="active",
            assigned_object_interface=Interface(
                device=dev_ref,
                name=iface_name,
                type="other",
            ),
            tags=["zabbix"],
        )))

        if is_main and primary_ip is None:
            primary_ip = ip_str

    return entities


# ---------------------------------------------------------------------------
# Orchestration
# ---------------------------------------------------------------------------


def collect_all_entities(cfg: dict) -> list[Entity]:
    zapi = connect_zabbix(cfg)
    hosts = collect_hosts(zapi)

    entities: list[Entity] = []
    for host in hosts:
        try:
            entities.extend(build_host_entities(host, cfg))
        except Exception as exc:
            hostname = host.get("name") or host.get("host", "?")
            log.error("Failed to process Zabbix host %s: %s", hostname, exc)

    return entities


def ingest_entities(entities: list[Entity], dry_run: bool = False) -> None:
    if not entities:
        log.warning("No entities to ingest")
        return

    target = os.environ.get("DIODE_TARGET", "grpc://localhost:8080/diode")
    client_id = os.environ.get("DIODE_CLIENT_ID",
                               os.environ.get("INGESTER_CLIENT_ID", "diode-ingester"))
    client_secret = os.environ.get("DIODE_CLIENT_SECRET",
                                   os.environ.get("INGESTER_CLIENT_SECRET", ""))

    if dry_run:
        log.info("DRY RUN: %d entities would be ingested", len(entities))
        for i, e in enumerate(entities):
            log.info("  [%d] %s", i, e)
        return

    if not client_secret:
        log.error("DIODE_CLIENT_SECRET not set — cannot ingest")
        sys.exit(1)

    log.info("Ingesting %d entities to %s ...", len(entities), target)

    with DiodeClient(
        target=target,
        client_id=client_id,
        client_secret=client_secret,
        app_name="zabbix-collector",
        app_version="0.1.0",
    ) as client:
        resp = client.ingest(entities=entities)
        if resp.errors:
            log.error("Ingestion errors: %s", resp.errors)
        else:
            log.info("Ingestion successful")


def main():
    parser = argparse.ArgumentParser(description="Zabbix collector for NetBox")
    parser.add_argument("--dry-run", action="store_true")
    parser.add_argument("--log-level", default="INFO",
                        choices=["DEBUG", "INFO", "WARNING", "ERROR"])
    parser.add_argument("--env-file", default=".env")
    args = parser.parse_args()

    logging.basicConfig(
        level=getattr(logging, args.log_level),
        format="%(asctime)s %(name)s %(levelname)s %(message)s",
    )

    load_dotenv(args.env_file)
    cfg = get_config()

    entities = collect_all_entities(cfg)
    log.info("Total entities: %d", len(entities))

    ingest_entities(entities, dry_run=args.dry_run)
    log.info("Done!")


if __name__ == "__main__":
    main()