# scanner.py - Orchestrates the full scan pipeline
import logging
import threading
from nocodb_client import get_switches
from ssh_client import scan_all_switches
from db import (
    upsert_switch, upsert_link, clear_links,
    log_scan_start, log_scan_finish, merge_duplicate_switches
)
from parser import parse_neighbor_description
from exports import run_all_exports

logger = logging.getLogger(__name__)

# Global scan state (shared with Flask via import)
scan_state = {
    "running": False,
    "done": 0,
    "total": 0,
    "current_ip": None,
    "current_hostname": None,
    "ok": 0,
    "fail": 0,
    "errors": [],
    "log_lines": [],
    "last_scan": None,
    "dept_filter": None,   # None = all, "ELEC" or "GW" = dept-only
    "aborted": False,
}

_abort_event = threading.Event()


def request_abort():
    """Signal the in-progress scan to stop after currently in-flight switches finish."""
    if scan_state["running"]:
        _abort_event.set()
        return True
    return False


def run_scan(dept: str = None, workers: int = 5, login_delay: int = 3):
    """
    Full scan: fetch switch IPs from NocoDB → SSH all → parse → store → export.
    dept: None = all active switches, "ELEC" or "GW" = dept-filtered.
    """
    global scan_state

    if scan_state["running"]:
        logger.warning("Scan already running, skipping.")
        return

    _abort_event.clear()

    # Fetch switch list from NocoDB (or fallback)
    switches = get_switches(dept=dept)

    if not switches:
        logger.error("NocoDB returned no switches — aborting scan.")
        scan_state["running"] = False
        return
        logger.error("No switches returned from NocoDB, aborting scan.")
        return

    scan_state.update({
        "running": True,
        "done": 0,
        "total": len(switches),
        "current_ip": None,
        "current_hostname": None,
        "ok": 0,
        "fail": 0,
        "errors": [],
        "log_lines": [],
        "dept_filter": dept,
        "aborted": False,
    })

    scan_id = log_scan_start()
    if dept is None:
        clear_links()  # Full scan only — dept scans upsert without wiping other depts

    def on_progress(done, total, ip, result):
        from datetime import datetime
        ts = datetime.now().strftime("%H:%M:%S")
        scan_state["done"] = done
        scan_state["total"] = total
        scan_state["current_ip"] = ip

        if result["success"]:
            scan_state["ok"] += 1
            scan_state["current_hostname"] = result.get("hostname", ip)
            vendor = result.get("vendor", "")
            n = len(result.get("neighbors", []))
            scan_state["log_lines"].append({
                "ts": ts, "ok": True,
                "text": f"✓  {result['hostname']} ({ip})  [{vendor}]  — {n} neighbor{'s' if n != 1 else ''}",
            })

            upsert_switch(
                chassis_id=result["chassis_id"],
                hostname=result["hostname"],
                mgmt_ip=result["mgmt_ip"],
                description=result.get("description", ""),
                firmware=result.get("firmware", ""),
                vendor=result.get("vendor", ""),
                serial=result.get("serial", ""),
            )

            for neighbor in result["neighbors"]:
                if neighbor.get("chassis_id") and neighbor.get("system_name"):
                    nbr_model, nbr_firmware = parse_neighbor_description(
                        neighbor.get("system_desc", "")
                    )
                    upsert_switch(
                        chassis_id=neighbor["chassis_id"],
                        hostname=neighbor["system_name"],
                        mgmt_ip=neighbor.get("mgmt_ip", ""),
                        description=nbr_model,  # empty for FS neighbors; direct scan fills it in
                        firmware=nbr_firmware,
                    )
                upsert_link(
                    chassis_a=result["chassis_id"],
                    port_a=neighbor["local_port"],
                    chassis_b=neighbor["chassis_id"],
                    port_b=neighbor["remote_port"],
                )
        else:
            scan_state["fail"] += 1
            error = result.get("error", "Unknown error")
            scan_state["errors"].append({"ip": ip, "error": error})
            error_short = error.splitlines()[0][:120]
            scan_state["log_lines"].append({
                "ts": ts, "ok": False,
                "text": f"✗  {ip}  — {error_short}",
            })

    scan_all_switches(switches, progress_callback=on_progress, max_workers=workers,
                       login_delay=login_delay, abort_event=_abort_event)

    if _abort_event.is_set():
        scan_state["aborted"] = True
        from datetime import datetime
        scan_state["log_lines"].append({
            "ts": datetime.now().strftime("%H:%M:%S"), "ok": False,
            "text": "⚠  Scan aborted by user",
        })

    try:
        merge_duplicate_switches()
    except Exception as e:
        logger.error(f"Merge error: {e}")

    try:
        run_all_exports()
    except Exception as e:
        logger.error(f"Export error: {e}")

    log_scan_finish(scan_id, scan_state["ok"], scan_state["fail"])

    from datetime import datetime
    scan_state["last_scan"] = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    scan_state["running"] = False
    scan_state["current_ip"] = None
    scan_state["current_hostname"] = None
    scan_state["dept_filter"] = None

    logger.info(f"Scan complete. OK: {scan_state['ok']}, Failed: {scan_state['fail']}")


def test_single_switch(ip: str, manufacturer: str = "", login_delay: int = 1) -> dict:
    """Test SSH connectivity/LLDP query against a single switch, independent of the main scan.
    Does not touch scan_state or the database — just returns the raw connect_and_query result."""
    entry = {"ip": ip, "manufacturer": manufacturer}
    results = scan_all_switches([entry], max_workers=1, login_delay=login_delay)
    return results[0] if results else {"success": False, "ip": ip, "error": "No result"}