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

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 dict: personal_nr -> line content."""
    if not csv_path or not os.path.exists(csv_path):
        logger.warning("AIDA CSV nicht gefunden: %s", 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 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

    matching = [l for l in lines if l.startswith(personal_nr.lower())]
    if not matching:
        return None

    line = matching[0]
    if line.endswith(settings["aida_status_abwesend"]):
        return "abwesend"
    if line.endswith(settings["aida_status_anwesend"]):
        return "anwesend"
    if line.endswith(settings["aida_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
            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 AND u.personal_nr != ''
        """).fetchall()

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

        # Read AIDA CSV
        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 ""

    # Determine AIDA status
    aida_status = determine_aida_status(aida_lines, personal_nr, settings)
    if aida_status is None:
        return

    # Determine Teams status
    teams_status = ""
    if aida_status == "anwesend":
        presence = graph.get_presence(azure_id)
        if presence and "activity" in presence:
            teams_status = "teams_" + presence["activity"].lower()

    # Check if status changed
    if aida_status == last_aida:
        if aida_status == "anwesend":
            if teams_status == last_teams:
                return  # No change
        else:
            return  # No change

    # Determine color
    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)
        if not color:
            color = get_color_for_status("teams_available", conn)
    else:
        color = get_color_for_status("available", conn)

    # Build URL and call WLED
    url = build_wled_url(
        hostname, color["r"], color["g"], color["b"],
        segment=segment, effect=color.get("effect", "")
    )
    success, result_text = call_wled(url)

    if success:
        # Update state
        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, teams_status, datetime.now(),
            aida_status, teams_status, datetime.now(),
        ))
        conn.commit()
        logger.info(
            "%-40s aida=%-12s teams=%-20s -> %s",
            display_name, aida_status, teams_status, result_text,
        )
    else:
        # Reset state on failure
        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, datetime.now(), datetime.now()))
        conn.commit()

    # Log activity
    log_activity(
        azure_id, display_name, aida_status, teams_status, url, result_text
    )