# scanner.py - Orchestrates the full scan pipeline
import logging
from nocodb_client import get_switch_ips
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 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": [],
    "last_scan": None,
    "dept_filter": None,   # None = all, "ELEC" or "GW" = dept-only
}


def run_scan(dept: str = None):
    """
    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

    # Fetch switch list from NocoDB (or fallback)
    switches = get_switch_ips(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": [],
        "dept_filter": dept,
    })

    scan_id = log_scan_start()
    clear_links()  # Fresh start for links each scan

    def on_progress(done, total, ip, result):
        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)

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

            for neighbor in result["neighbors"]:
                if neighbor.get("chassis_id") and neighbor.get("system_name"):
                    upsert_switch(
                        chassis_id=neighbor["chassis_id"],
                        hostname=neighbor["system_name"],
                        mgmt_ip=neighbor.get("mgmt_ip", ""),
                        description=neighbor.get("system_desc", ""),
                    )
                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
            scan_state["errors"].append({
                "ip": ip,
                "error": result.get("error", "Unknown error")
            })

    scan_all_switches(switches, progress_callback=on_progress)

    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']}")