#!/bin/bash
# Route 5 smart monitor — determines direction by time of day, launches background watcher
# Usage: bash monitor.sh [channel_id]
# Before 11 AM CST → Eastbound (morning commute)
# After 11 AM CST → Westbound (evening commute)
set -eo pipefail

CHANNEL="${1:-1467247377743347953}"
TU_URL="https://data.texas.gov/download/mqtr-wwpy/application%2Fjson"

STATE_DIR="/home/node/.openclaw/workspace/skills/capmetro-monitor/memory"
mkdir -p "$STATE_DIR"

NOW=$(date +%s)
CST_HOUR=$(TZ=America/Chicago date +%H)

if [ "$CST_HOUR" -lt 11 ]; then
    DIRECTION=0
    DIR_NAME="Eastbound"
    FIRST_STOP="5854"
    FIRST_STOP_NAME="Anderson/Northcross"
    USER_STOP="964"
    USER_STOP_NAME="Woodrow/Choquette"
    TRAVEL_FIRST_TO_USER=446   # 7m26s
    WALK_LEAD=0                # already near stop
else
    DIRECTION=1
    DIR_NAME="Westbound"
    FIRST_STOP="4606"
    FIRST_STOP_NAME="Tannehill/Webberville"
    USER_STOP="5499"
    USER_STOP_NAME="6th/West"
    TRAVEL_FIRST_TO_USER=2384  # 39m44s
    WALK_LEAD=900              # 15 min walk from office
    HOME_STOP="1072"
    HOME_STOP_NAME="Woodrow/Dwyce"
    TRAVEL_USER_TO_HOME=1344   # 22m24s
fi

# Find next departure from first stop
TU=$(curl -sL --max-time 10 "$TU_URL" 2>/dev/null)
NEXT=$(echo "$TU" | jq --arg dir "$DIRECTION" --arg fs "$FIRST_STOP" --arg now "$NOW" '
  [.entity[] |
    select(.tripUpdate.trip.routeId == "5" and (.tripUpdate.trip.directionId | tostring) == $dir) |
    {
      tripId: .tripUpdate.trip.tripId,
      depart: ([.tripUpdate.stopTimeUpdate[] | select(.stopId == $fs) | (.departure.time // .arrival.time)] | .[0])
    }
  ] | [.[] | select(.depart != null and (.depart | tonumber) > ($now | tonumber))]
  | sort_by(.depart | tonumber) | .[0]' 2>/dev/null)

TRIP_ID=$(echo "$NEXT" | jq -r '.tripId // empty')
DEPART_TS=$(echo "$NEXT" | jq -r '.depart // empty')

if [ -z "$TRIP_ID" ] || [ -z "$DEPART_TS" ]; then
    echo '{"ok":false,"error":"No upcoming Route 5 departures found"}'
    exit 1
fi

DEPART_CST=$(TZ=America/Chicago date -d "@$DEPART_TS" +"%I:%M %p" 2>/dev/null)
MINS_AWAY=$(( (DEPART_TS - NOW) / 60 ))

# Export config for the watcher
export DIRECTION DIR_NAME FIRST_STOP FIRST_STOP_NAME USER_STOP USER_STOP_NAME
export TRAVEL_FIRST_TO_USER WALK_LEAD TRIP_ID DEPART_TS CHANNEL
export HOME_STOP HOME_STOP_NAME TRAVEL_USER_TO_HOME

echo "{\"ok\":true,\"direction\":\"$DIR_NAME\",\"tripId\":\"$TRIP_ID\",\"firstStopDepart\":\"$DEPART_CST\",\"minsUntilDepart\":$MINS_AWAY,\"userStop\":\"$USER_STOP_NAME\"}"

# Kill any existing watcher
PID_FILE="$STATE_DIR/watcher.pid"
if [ -f "$PID_FILE" ]; then
    OLD_PID=$(cat "$PID_FILE" 2>/dev/null)
    if [ -n "$OLD_PID" ] && kill -0 "$OLD_PID" 2>/dev/null; then
        kill "$OLD_PID" 2>/dev/null || true
    fi
    rm -f "$PID_FILE"
fi

# Dynamic timeout: time until departure + 5 min buffer for delays
WAIT_SECS=$(( DEPART_TS - NOW + 300 ))
[ "$WAIT_SECS" -lt 900 ] && WAIT_SECS=900  # minimum 15 min

# Calculate MAX_POLLS for the watcher (poll every 20s)
export MAX_POLLS=$(( WAIT_SECS / 20 ))

SCRIPT_DIR="$(dirname "$0")"
nohup timeout "$WAIT_SECS" bash "$SCRIPT_DIR/watch-departure-v2.sh" > /dev/null 2>&1 &
echo $! > "$PID_FILE"