import logging
import os
from datetime import datetime

from database import get_db, get_setting, log_activity
from wled_client import build_wled_url, call_wled, get_wled_info

logger = logging.getLogger(__name__)

# Global reference to graph client (set by app.py on startup)
graph = None


def read_aida_csv(csv_path):
    """Read AIDA status CSV. Returns list of lines."""
    if not csv_path or not os.path.exists(csv_path):
        return []
    try:
        with open(csv_path, "r", encoding="utf-8", errors="replace") as f:
            lines = f.read().splitlines()
        return lines
    except Exception as e:
        logger.error("Fehler beim Lesen der AIDA CSV: %s", e)
        return []


def _extract_nr(value):
    """Extract bare number from ~~00341~~ -> 00341."""
    return value.strip().strip("~")


def determine_aida_status(lines, personal_nr, settings):
    """Determine AIDA status for a user based on their personal number."""
    if not personal_nr or not lines:
        return None

    nr = _extract_nr(personal_nr)
    if not nr:
        return None

    # Find line containing this personal number
    matching = [l for l in lines if nr in l]
    if not matching:
        return None

    line = matching[0]
    # Check status part (after comma or at end)
    status_abwesend = _extract_nr(settings.get("aida_status_abwesend", "~~0~~"))
    status_anwesend = _extract_nr(settings.get("aida_status_anwesend", "~~1~~"))
    status_homeoffice = _extract_nr(settings.get("aida_status_homeoffice", "~~2~~"))

    # Get the status value (last part after comma, stripped of ~)
    parts = line.split(",")
    status_val = _extract_nr(parts[-1]) if len(parts) > 1 else ""

    if status_val == status_abwesend:
        return "abwesend"
    if status_val == status_anwesend:
        return "anwesend"
    if status_val == status_homeoffice:
        return "homeoffice"
    return None


def get_color_for_status(status, conn):
    """Get RGB color for a given status from color_rules."""
    row = conn.execute(
        "SELECT r, g, b, effect FROM color_rules WHERE status = ?", (status,)
    ).fetchone()
    if row:
        return dict(row)
    return {"r": 200, "g": 200, "b": 200, "effect": ""}


def poll_status():
    """Main polling function - called periodically by APScheduler."""
    global graph

    if graph is None or not graph.is_authenticated():
        logger.warning("Graph-Client nicht authentifiziert, ueberspringe Polling")
        return

    conn = get_db()
    try:
        settings = {}
        for row in conn.execute("SELECT key, value FROM settings").fetchall():
            settings[row["key"]] = row["value"]

        # Get all active users with assignments
        users_with_assignments = conn.execute("""
            SELECT u.azure_id, u.display_name, u.personal_nr,
                   a.segment, d.hostname,
                   s.last_aida_status, s.last_teams_status,
                   COALESCE(s.phone_active, 0) as phone_active
            FROM users u
            JOIN assignments a ON a.user_azure_id = u.azure_id
            JOIN wled_devices d ON d.id = a.wled_device_id
            LEFT JOIN state s ON s.user_azure_id = u.azure_id
            WHERE u.active = 1
        """).fetchall()

        if not users_with_assignments:
            logger.debug("Keine aktiven User mit Zuordnungen gefunden")
            return

        # Read AIDA CSV (kann leer sein)
        aida_lines = read_aida_csv(settings.get("aida_csv_path", ""))

        for user in users_with_assignments:
            try:
                _process_user(user, aida_lines, settings, conn)
            except Exception as e:
                logger.error(
                    "Fehler bei User %s: %s", user["display_name"], e
                )

    except Exception as e:
        logger.error("Polling Fehler: %s", e)
    finally:
        conn.close()


def _process_user(user, aida_lines, settings, conn):
    """Process a single user: check status and update WLED if needed."""
    global graph

    azure_id = user["azure_id"]
    display_name = user["display_name"]
    personal_nr = user["personal_nr"]
    hostname = user["hostname"]
    segment = user["segment"]
    last_aida = user["last_aida_status"] or ""
    last_teams = user["last_teams_status"] or ""
    phone_active = user["phone_active"]

    # Immer Teams-Status abfragen (fuer Dashboard-Anzeige)
    teams_status = ""
    presence = graph.get_presence(azure_id)
    if presence and "activity" in presence:
        teams_status = "teams_" + presence["activity"].lower()

    # AIDA-Status ermitteln
    aida_status = determine_aida_status(aida_lines, personal_nr, settings)

    # Check if anything changed
    if aida_status == last_aida and teams_status == last_teams:
        return  # No change

    # --- WLED nur steuern wenn AIDA-Status bekannt und kein aktives Telefonat ---
    wled_changed = aida_status is not None and not phone_active and (
        aida_status != last_aida or
        (aida_status == "anwesend" and teams_status != last_teams)
    )

    if wled_changed:
        # Farbe bestimmen nach Originallogik:
        # abwesend -> abwesend-Farbe
        # homeoffice -> homeoffice-Farbe
        # anwesend -> Teams-Farbe
        if aida_status == "abwesend":
            color = get_color_for_status("abwesend", conn)
        elif aida_status == "homeoffice":
            color = get_color_for_status("homeoffice", conn)
        elif aida_status == "anwesend" and teams_status:
            color = get_color_for_status(teams_status, conn)
        else:
            color = get_color_for_status("available", conn)

        url = build_wled_url(
            hostname, color["r"], color["g"], color["b"],
            segment=segment, effect=color.get("effect", "")
        )
        success, result_text = call_wled(url)

        if not success:
            logger.warning("WLED Fehler fuer %s: %s", display_name, result_text)

        log_activity(
            azure_id, display_name,
            aida_status or "-", teams_status or "-",
            url, result_text,
        )

    # State immer aktualisieren (fuer Dashboard)
    conn.execute("""
        INSERT INTO state (user_azure_id, last_aida_status, last_teams_status, updated_at)
        VALUES (?, ?, ?, ?)
        ON CONFLICT(user_azure_id)
        DO UPDATE SET last_aida_status=?, last_teams_status=?, updated_at=?
    """, (
        azure_id,
        aida_status or last_aida, teams_status, datetime.now(),
        aida_status or last_aida, teams_status, datetime.now(),
    ))
    conn.commit()

    logger.info(
        "%-40s aida=%-12s teams=%-20s wled=%s",
        display_name, aida_status or "-", teams_status,
        "aktualisiert" if wled_changed else "nur Dashboard",
    )


def check_devices():
    """Check all WLED devices and store status in DB. Called periodically."""
    conn = get_db()
    try:
        devices = conn.execute("SELECT id, hostname FROM wled_devices").fetchall()
        for dev in devices:
            info = get_wled_info(dev["hostname"])
            if info.get("online"):
                conn.execute("""
                    UPDATE wled_devices
                    SET online=1, leds=?, version=?, mac=?, last_check=?
                    WHERE id=?
                """, (
                    info.get("leds", 0),
                    info.get("version", ""),
                    info.get("mac", ""),
                    datetime.now(),
                    dev["id"],
                ))
            else:
                conn.execute("""
                    UPDATE wled_devices SET online=0, last_check=? WHERE id=?
                """, (datetime.now(), dev["id"]))
        conn.commit()
        logger.info("Device-Check: %d Geraete geprueft", len(devices))
    except Exception as e:
        logger.error("Device-Check Fehler: %s", e)
    finally:
        conn.close()