#!/usr/bin/env bash
# flash.sh — build + flash the ESP32-C3 F3 bridge from steel141.
# The C3 is at /dev/ttyACM0 (native USB-Serial-JTAG). esptool is already present;
# arduino-cli + the esp32 core are installed on first run if missing.
set -euo pipefail

PORT="${1:-/dev/ttyACM0}"
SKETCH="$(cd "$(dirname "$0")" && pwd)/clar200_bridge.ino"
FQBN="esp32:esp32:esp32c3:CDCOnBoot=cdc"   # CDCOnBoot=cdc -> Serial == USB-CDC (required by sketch)

command -v arduino-cli >/dev/null 2>&1 || {
  echo ">> installing arduino-cli to ~/.local/bin ..."
  mkdir -p ~/.local/bin
  curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh \
    | BINDIR=~/.local/bin sh
  export PATH="$HOME/.local/bin:$PATH"
}

if ! arduino-cli core list 2>/dev/null | grep -q '^esp32:esp32'; then
  echo ">> installing esp32 Arduino core (this is the big download) ..."
  arduino-cli config init --overwrite >/dev/null 2>&1 || true
  arduino-cli config add board_manager.additional_urls \
    https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
  arduino-cli core update-index
  arduino-cli core install esp32:esp32
fi

# arduino-cli wants the sketch in a dir named like the .ino; it already is.
SKETCH_DIR="$(dirname "$SKETCH")"
echo ">> compiling for $FQBN ..."
arduino-cli compile --fqbn "$FQBN" "$SKETCH_DIR"

echo ">> flashing to $PORT ..."
arduino-cli upload --fqbn "$FQBN" --port "$PORT" "$SKETCH_DIR"

echo ">> done. Open the terminal with:  screen $PORT 115200   (Ctrl-A k to quit)"
echo "   USB-CDC baud is virtual; set the DRIVE baud with ~1/~2/~3/~4 inside the session."