name: ESP32 Build & Release

on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      # ------------------------------------------------------------
      # Checkout
      # ------------------------------------------------------------
      - name: Checkout
        uses: actions/checkout@v4

      # ------------------------------------------------------------
      # System dependencies
      # ------------------------------------------------------------
      - name: Install system dependencies
        shell: bash
        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

      # ------------------------------------------------------------
      # Cache ESP-IDF and Espressif tools
      # ------------------------------------------------------------
      - name: Cache ESP-IDF
        uses: actions/cache@v4
        with:
          path: |
            ~/esp/esp-idf
            ~/.espressif
          key: esp-idf-5.5-esp32-${{ runner.os }}
          restore-keys: |
            esp-idf-5.5-esp32-

      # ------------------------------------------------------------
      # Install ESP-IDF 5.5
      # ------------------------------------------------------------
      - name: Install ESP-IDF 5.5
        shell: bash
        run: |
          mkdir -p "$HOME/esp"

          if [ ! -f "$HOME/esp/esp-idf/export.sh" ]; then
            echo "ESP-IDF not found in cache."
            echo "Cloning ESP-IDF 5.5..."

            git clone --recursive \
              --branch v5.5 \
              https://github.com/espressif/esp-idf.git \
              "$HOME/esp/esp-idf"

            cd "$HOME/esp/esp-idf"

            ./install.sh esp32
          else
            echo "Using cached ESP-IDF."
          fi

      # ------------------------------------------------------------
      # Verify ESP-IDF
      # ------------------------------------------------------------
      - name: Verify ESP-IDF
        shell: bash
        run: |
          source "$HOME/esp/esp-idf/export.sh"

          echo "ESP-IDF:"
          idf.py --version

      # ------------------------------------------------------------
      # Build firmware
      # ------------------------------------------------------------
      - name: Build firmware
        shell: bash
        run: |
          source "$HOME/esp/esp-idf/export.sh"

          idf.py set-target esp32
          idf.py build

      # ------------------------------------------------------------
      # Create merged firmware image
      # ------------------------------------------------------------
      - name: Create merged firmware
        shell: bash
        run: |
          source "$HOME/esp/esp-idf/export.sh"

          idf.py merge-bin

      # ------------------------------------------------------------
      # Prepare release artifacts
      # ------------------------------------------------------------
      # ------------------------------------------------------------
      # Prepare release artifacts & calculate hashes
      # ------------------------------------------------------------
      - name: Prepare release
        shell: bash
        run: |
          mkdir -p release

          # Primary OTA application binary
          if [ -f build/mtg-rfid-companion.bin ]; then
            cp build/mtg-rfid-companion.bin release/mtg-rfid-companion.bin
            cp build/mtg-rfid-companion.bin release/firmware.bin
          else
            echo "ERROR: build/mtg-rfid-companion.bin not found!"
            exit 1
          fi

          # Merged binary for USB factory flashing
          if [ -f build/merged-binary.bin ]; then
            cp build/merged-binary.bin release/merged-firmware.bin
          fi

          # ELF for debugging
          find build -maxdepth 1 -type f -name "*.elf" -exec cp {} release/ \;

          # Calculate hashes
          BIN_SHA256=$(sha256sum release/mtg-rfid-companion.bin | awk '{print $1}')
          IMG_SHA256=$(python3 -c "with open('release/mtg-rfid-companion.bin','rb') as f: f.seek(-32,2); print(f.read().hex())")

          echo "BIN_SHA256=${BIN_SHA256}" >> $GITHUB_ENV
          echo "IMG_SHA256=${IMG_SHA256}" >> $GITHUB_ENV

          echo "Firmware SHA256: ${BIN_SHA256}" > release/firmware.sha256
          echo "Image SHA256: ${IMG_SHA256}" >> release/firmware.sha256
          echo "Commit: ${{ github.sha }}" >> release/firmware.sha256

          echo "OTA Release prepared:"
          echo "  Binary: release/mtg-rfid-companion.bin"
          echo "  File SHA-256: ${BIN_SHA256}"
          echo "  Image SHA-256: ${IMG_SHA256}"
          ls -lh release/

      # ------------------------------------------------------------
      # Delete existing "latest" release
      # ------------------------------------------------------------
      - name: Delete existing latest release
        shell: bash
        env:
          GITEA_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          API="${{ github.server_url }}/api/v1"

          echo "Removing existing latest release..."

          curl -fsSL \
            -X DELETE \
            -H "Authorization: token ${GITEA_TOKEN}" \
            "${API}/repos/${{ github.repository }}/releases/tags/latest" \
            || true

          # Delete the tag as well
          curl -fsSL \
            -X DELETE \
            -H "Authorization: token ${GITEA_TOKEN}" \
            "${API}/repos/${{ github.repository }}/tags/latest" \
            || true

      # ------------------------------------------------------------
      # Create latest release
      # ------------------------------------------------------------
      - name: Create latest release
        uses: akkuman/gitea-release-action@v1
        with:
          server_url: ${{ github.server_url }}
          repository: ${{ github.repository }}
          token: ${{ secrets.GITHUB_TOKEN }}

          tag_name: latest
          name: "Latest ESP32 Firmware"

          body: |
            Automatically built from the `main` branch.

            Commit:
            ${{ github.sha }}

            SHA256:
            ${{ env.IMG_SHA256 }}

            File-SHA256:
            ${{ env.BIN_SHA256 }}

            ESP-IDF:
            5.5

            Target:
            ESP32

            This release is automatically replaced on every push to `main`.

          files: |
            release/*