name: Backend E2E Tests

on:
  push:
    branches: [master, main]
  pull_request:
    branches: [master, main]

jobs:
  e2e:
    runs-on: ubuntu-latest
    timeout-minutes: 30

    env:
      QEMU_RELEASE_URL: https://github.com/davidmonterocrespo24/velxio/releases/download/qemu-prebuilt
      QEMU_DIR: /opt/velxio-qemu
      BACKEND_URL: http://localhost:8001

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

      # ── QEMU binaries + ROM files ──────────────────────────────────────────────
      - name: Download QEMU binaries and ROM files
        run: |
          mkdir -p $QEMU_DIR
          cd $QEMU_DIR

          echo "Downloading QEMU shared libraries..."
          curl -fSL -o libqemu-xtensa.so  "$QEMU_RELEASE_URL/libqemu-xtensa-amd64.so"
          curl -fSL -o libqemu-riscv32.so "$QEMU_RELEASE_URL/libqemu-riscv32-amd64.so"

          echo "Downloading ROM files..."
          curl -fSL -o esp32-v3-rom.bin     "$QEMU_RELEASE_URL/esp32-v3-rom.bin"
          curl -fSL -o esp32-v3-rom-app.bin "$QEMU_RELEASE_URL/esp32-v3-rom-app.bin"
          curl -fSL -o esp32c3-rom.bin      "$QEMU_RELEASE_URL/esp32c3-rom.bin"

          chmod +x libqemu-xtensa.so libqemu-riscv32.so
          ls -lh .

          # Report missing shared-library dependencies (if any)
          echo "=== ldd libqemu-xtensa.so ==="
          ldd libqemu-xtensa.so || true

      # ── arduino-cli + ESP32 core + required libraries ──────────────────────────
      - name: Install arduino-cli
        run: |
          curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh \
            | BINDIR=/usr/local/bin sh

      - name: Cache arduino-cli cores and libraries
        uses: actions/cache@v4
        with:
          path: |
            ~/.arduino15
            ~/Arduino/libraries
          key: arduino-cores-esp32-libs-${{ runner.os }}-v2

      - name: Install ESP32 arduino core and required libraries
        run: |
          arduino-cli config init --overwrite
          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

          # Libraries needed by the e2e test sketches
          # DHT22 test needs: DHT sensor library
          # MPU6050 test needs: Adafruit MPU6050 + Adafruit Unified Sensor
          arduino-cli lib install "DHT sensor library"
          arduino-cli lib install "Adafruit MPU6050"
          arduino-cli lib install "Adafruit Unified Sensor"

      # ── Python + backend dependencies ─────────────────────────────────────────
      - name: Set up Python 3.11
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      - name: Cache pip
        uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key: pip-${{ hashFiles('backend/requirements.txt') }}

      - name: Install backend dependencies
        run: pip install -r backend/requirements.txt

      # ── Node.js ───────────────────────────────────────────────────────────────
      - name: Set up Node.js 20
        uses: actions/setup-node@v4
        with:
          node-version: '20'

      # ── Start backend ─────────────────────────────────────────────────────────
      - name: Start backend server
        run: |
          cd backend
          uvicorn app.main:app --port 8001 --log-level info \
            > /tmp/backend.log 2>&1 &
          echo "Backend PID: $!"
        env:
          QEMU_ESP32_LIB: /opt/velxio-qemu/libqemu-xtensa.so
          QEMU_RISCV32_LIB: /opt/velxio-qemu/libqemu-riscv32.so

      - name: Wait for backend to be ready
        run: |
          echo "Waiting for backend on port 8001..."
          for i in $(seq 1 60); do
            if curl -sf http://localhost:8001/health > /dev/null 2>&1; then
              echo "Backend is up after ${i}s"
              exit 0
            fi
            sleep 1
          done
          echo "=== Backend failed to start — last 80 lines of log: ==="
          tail -80 /tmp/backend.log || echo "(no log file)"
          exit 1

      # ── Run e2e tests ─────────────────────────────────────────────────────────
      #
      # These tests compile real firmware via arduino-cli and run full simulations
      # over WebSocket using libqemu-xtensa.so. Each test has a generous timeout
      # because ESP32 firmware compilation + QEMU boot takes 30-90 s.
      #
      - name: Run HC-SR04 e2e test
        run: node test/backend/e2e/test_hcsr04_simulation.mjs --timeout=75
        env:
          BACKEND_URL: http://localhost:8001

      - name: Run DHT22 e2e test
        run: node test/backend/e2e/test_dht22_simulation.mjs --timeout=90
        env:
          BACKEND_URL: http://localhost:8001

      - name: Run MPU-6050 e2e test
        run: node test/backend/e2e/test_mpu6050_simulation.mjs --timeout=90
        env:
          BACKEND_URL: http://localhost:8001

      # ── Always dump backend logs so failures are diagnosable ──────────────────
      - name: Show backend logs
        if: always()
        run: |
          echo "=== Backend log (last 150 lines) ==="
          tail -150 /tmp/backend.log || echo "(no log file)"