name: Build & Release

on:
  push:
    tags:
      - 'v*'
  workflow_dispatch:

env:
  CARGO_TERM_COLOR: always

permissions:
  contents: write

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install system dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y git wget flex bison gperf python3 python3-pip \
            python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util \
            libusb-1.0-0 pkg-config

      - name: Install espup, espflash, and ldproxy
        run: |
          RUSTUP_TOOLCHAIN=stable cargo install espup espflash ldproxy
          espup install
          . $HOME/export-esp.sh
          echo "$HOME/.rustup/toolchains/esp/bin" >> $GITHUB_PATH

      - name: Set ESP-IDF environment
        run: |
          . $HOME/export-esp.sh
          echo "LIBCLANG_PATH=$HOME/.rustup/toolchains/esp/xtensa-esp32-elf-clang/esp-clang/bin" >> $GITHUB_ENV
          echo "ESP_IDF_VERSION=v5.2.1" >> $GITHUB_ENV
          echo "ESP_IDF_SDKCONFIG_DEFAULTS=sdkconfig.defaults" >> $GITHUB_ENV
          echo "ESP_IDF_CMAKE_GENERATOR=Ninja" >> $GITHUB_ENV

      - name: Build release
        run: |
          . $HOME/export-esp.sh
          cargo build --target xtensa-esp32s3-espidf --release

      - name: Create merged firmware binary
        run: |
          espflash save-image --chip esp32s3 --merge \
            target/xtensa-esp32s3-espidf/release/lunarcore \
            lunarcore-esp32s3.bin

      - name: Upload artifact
        uses: actions/upload-artifact@v4
        with:
          name: lunarcore-esp32s3
          path: lunarcore-esp32s3.bin

      - name: Create GitHub Release
        if: startsWith(github.ref, 'refs/tags/v')
        uses: softprops/action-gh-release@v2
        with:
          files: lunarcore-esp32s3.bin
          generate_release_notes: true
          body: |
            ## Flash Instructions

            **Prerequisites:** Install esptool (`pip install esptool`)

            **Flash the firmware:**
            ```bash
            esptool.py --chip esp32s3 -p PORT write_flash 0x0 lunarcore-esp32s3.bin
            ```

            Replace `PORT` with your serial port:
            - **Linux:** `/dev/ttyACM0` or `/dev/ttyUSB0`
            - **macOS:** `/dev/cu.usbmodem*`
            - **Windows:** `COM3` (check Device Manager)

            **Supported hardware:** Heltec WiFi LoRa 32 V3, LilyGo T3-S3, or any ESP32-S3 + SX1262 board.

            The binary includes bootloader + partition table + application merged at offset 0x0.