#!/bin/bash

# Config variables
QB_WEBUI_URL="http://qbittorrent:port"
QB_API_USER="redacted"
QB_API_PASS="redacted"
LOGFILE="/directory/to/save/port_update.log"

# Keep only the last 150 lines
tail -n 150 "$LOGFILE" > "${LOGFILE}.tmp" 2>/dev/null && mv "${LOGFILE}.tmp" "$LOGFILE"

# Get the forwarded port from PIA
FORWARDED_PORT=$(piactl get portforward)

# Check if the forwarded port is valid
if [[ "$FORWARDED_PORT" == "Inactive" || "$FORWARDED_PORT" == "Unavailable" ]]; then
    echo "$(date): PIA port forwarding is not available." >> "$LOGFILE"
    exit 1
fi

# Update qBittorrent's listening port via Web API
echo "$(date): Updating qBittorrent to listen on port $FORWARDED_PORT..." >> "$LOGFILE"

# Construct the JSON payload for the API request
JSON_PAYLOAD="{\"listen_port\":$FORWARDED_PORT}"

# Make the API request to update qBittorrent's port
RESPONSE=$(curl -s -w "%{http_code}" -o /dev/null -X POST \
    -d "json=$JSON_PAYLOAD" \
    "$QB_WEBUI_URL/api/v2/app/setPreferences" \
    -u "$QB_API_USER:$QB_API_PASS")

# Check if the request was successful
if [ "$RESPONSE" -eq 200 ]; then
    echo "$(date): Successfully updated qBittorrent to listen on port $FORWARDED_PORT." >> "$LOGFILE"
else
    echo "$(date): Failed to update qBittorrent's port. HTTP status code: $RESPONSE" >> "$LOGFILE"
fi