#!/bin/bash
# Build / upload / monitor the HomeKit garage door firmware.
#
#   ./flash.sh build              compile only
#   ./flash.sh upload [port]      compile + upload
#   ./flash.sh monitor [port]     serial console at 115200
#
# The min_spiffs partition scheme is REQUIRED: HomeSpan + WiFi + OTA
# overflows the stock 1.2MB app partition. min_spiffs gives 1.9MB with
# OTA still available.

set -euo pipefail

export PATH="$HOME/.local/bin:$PATH"

FQBN="esp32:esp32:XIAO_ESP32C3:PartitionScheme=min_spiffs"
SKETCH="$(dirname "$(readlink -f "$0")")/garage_door"

detect_port() {
    for p in /dev/ttyACM* /dev/ttyUSB*; do
        [ -e "$p" ] && { echo "$p"; return; }
    done
    echo "ERROR: no serial device found. Plug in the XIAO, or hold BOOT while" >&2
    echo "       connecting to force the bootloader." >&2
    exit 1
}

cmd="${1:-build}"
port="${2:-}"

case "$cmd" in
  build)
    arduino-cli compile --fqbn "$FQBN" "$SKETCH"
    ;;
  upload)
    [ -n "$port" ] || port="$(detect_port)"
    echo "Uploading to $port"
    arduino-cli compile --fqbn "$FQBN" "$SKETCH"
    arduino-cli upload -p "$port" --fqbn "$FQBN" "$SKETCH"
    echo "Done. Watch it boot with: $0 monitor"
    ;;
  monitor)
    [ -n "$port" ] || port="$(detect_port)"
    arduino-cli monitor -p "$port" -c baudrate=115200
    ;;
  *)
    sed -n '2,12p' "$0" | sed 's/^# \?//'
    exit 1
    ;;
esac