name: Build Linux Release

on:
  push:
    paths:
      - '**.cpp'
      - '**.h'
      - '**.c'
      - '**/meson.build'
      - 'meson.build'
      - '**/CMakeLists.txt'
      - 'CMakeLists.txt'
      - '.github/workflows/build-linux.yml'
  pull_request:
    paths:
      - '**.cpp'
      - '**.h'
      - '**.c'
      - '**/meson.build'
      - 'meson.build'
      - '**/CMakeLists.txt'
      - 'CMakeLists.txt'
      - '.github/workflows/build-linux.yml'

jobs:
  build-linux:
    runs-on: ubuntu-latest
    concurrency:
      group: build-linux-${{ github.ref }}
      cancel-in-progress: true
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install system dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y build-essential python3 python3-pip python3-setuptools libgl1-mesa-dev libglu1-mesa-dev libglfw3-dev libpng-dev pkg-config clang lld ccache libssl-dev
          # Set a reasonable ccache size
          ccache -M 5G || true

      - name: Setup Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.x'

      - name: Cache pip packages
        uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-pip-${{ hashFiles('.github/workflows/build-linux.yml') }}

      - name: Install Meson and Ninja (pip)
        run: |
          python -m pip install --upgrade pip
          pip install meson ninja

      - name: Restore ccache
        uses: actions/cache@v4
        with:
          path: ~/.ccache
          key: ${{ runner.os }}-ccache-${{ hashFiles('**/meson.build') }}

      - name: Restore meson cache
        uses: actions/cache@v4
        with:
          path: ~/.cache/meson
          key: ${{ runner.os }}-meson-${{ hashFiles('**/meson.build') }}

      - name: Configure Meson
        env:
          CC: "ccache clang"
          CXX: "ccache clang++"
          CCACHE_DIR: ${{ runner.temp }}/ccache
        run: |
          mkdir -p "$CCACHE_DIR"
          export CCACHE_DIR="$CCACHE_DIR"
          meson setup build_meson --wipe --buildtype=release

      - name: Configure Meson (debug)
        env:
          CC: "ccache clang"
          CXX: "ccache clang++"
          CCACHE_DIR: ${{ runner.temp }}/ccache
        run: |
          mkdir -p "$CCACHE_DIR"
          export CCACHE_DIR="$CCACHE_DIR"
          meson setup build_debug --wipe --buildtype=debug

      - name: Build with Ninja
        env:
          CC: "ccache clang"
          CXX: "ccache clang++"
          CCACHE_DIR: ${{ runner.temp }}/ccache
        run: |
          export CCACHE_DIR="${{ runner.temp }}/ccache"
          # Use all available cores for faster parallel builds
          ninja -C build_meson -j$(nproc) -v

      - name: Build Debug with Ninja
        env:
          CC: "ccache clang"
          CXX: "ccache clang++"
          CCACHE_DIR: ${{ runner.temp }}/ccache
        run: |
          export CCACHE_DIR="${{ runner.temp }}/ccache"
          ninja -C build_debug -j$(nproc) -v

      - name: Install patchelf
        run: sudo apt-get install -y patchelf

      - name: Bundle executable + libraries
        env:
          GITHUB_SHA: ${{ github.sha }}
        run: |
          set -euo pipefail
          EXE_PATH=build_meson/Minecraft.Client/Minecraft.Client
          if [ ! -f "$EXE_PATH" ]; then
            echo "ERROR: expected executable at $EXE_PATH" >&2
            ls -la build_meson || true
            exit 1
          fi

          SHORT_SHA=$(echo "$GITHUB_SHA" | cut -c1-8)
          BUNDLE=out/minecraft-client-linux-${SHORT_SHA}
          mkdir -p "$BUNDLE/lib"

          # Copy the binary
          cp "$EXE_PATH" "$BUNDLE/Minecraft.Client"

          # Collect non-system shared library dependencies and copy them in.
          # Exclude glibc/libstdc++/libgcc — these are ABI-specific and must
          # come from the user's system, not from the build runner.
          ldd "$EXE_PATH" \
            | awk '/=>/ { print $3 }' \
            | grep -v '^(' \
            | grep -Ev '/(libc|libm|libdl|libpthread|librt|libgcc_s|libstdc\+\+|ld-linux)[^/]*\.so' \
            | sort -u \
            | while read -r lib; do
                [ -f "$lib" ] && cp "$lib" "$BUNDLE/lib/" || true
              done

          # Patch the binary RPATH so it finds libs in ./lib at runtime
          patchelf --set-rpath '$ORIGIN/lib' "$BUNDLE/Minecraft.Client"

          # Write a launcher script
          cat > "$BUNDLE/run.sh" << 'RUNEOF'
          #!/usr/bin/env bash
          # 4JCraft Linux launcher
          # -------------------------------------------------------------------
          # IMPORTANT: Before running, copy the "Common" assets folder from
          # https://github.com/smartcmd/MinecraftConsoles/releases/tag/nightly
          # (LCEWindows64.zip → extract → copy "Common" next to this script)
          # -------------------------------------------------------------------
          DIR="$(cd "$(dirname "$0")" && pwd)"
          if [ ! -d "$DIR/Common" ]; then
            echo "ERROR: Missing 'Common' assets folder."
            echo "Download LCEWindows64.zip from:"
            echo "  https://github.com/smartcmd/MinecraftConsoles/releases/tag/nightly"
            echo "Extract it and copy the 'Common' folder next to this run.sh file."
            exit 1
          fi
          cd "$DIR"
          exec ./Minecraft.Client "$@"
          RUNEOF
          chmod +x "$BUNDLE/run.sh"

          # Write a README
          cat > "$BUNDLE/README.txt" << 'EOF'
          4JCraft Linux Build
          ===================
          This bundle contains:
            Minecraft.Client   - compiled Linux binary
            lib/               - all required shared libraries (GL, GLFW, png, zlib, X11 etc.)
            run.sh             - launcher script

          To run:
          1. Download LCEWindows64.zip from the MinecraftConsoles nightly release:
               https://github.com/smartcmd/MinecraftConsoles/releases/tag/nightly
          2. Extract it and copy the "Common" folder into this directory
             (so you have Common/ sitting next to run.sh)
          3. Run:  ./run.sh [--width W] [--height H] [--fullscreen]
          EOF

          echo "Bundle ready: $BUNDLE"
          ls -lh "$BUNDLE" "$BUNDLE/lib"

      - name: Bundle debug executable + libraries
        env:
          GITHUB_SHA: ${{ github.sha }}
        run: |
          set -euo pipefail
          EXE_PATH=build_debug/Minecraft.Client/Minecraft.Client
          if [ ! -f "$EXE_PATH" ]; then
            echo "ERROR: expected debug executable at $EXE_PATH" >&2
            ls -la build_debug || true
            exit 1
          fi

          SHORT_SHA=$(echo "$GITHUB_SHA" | cut -c1-8)
          BUNDLE=out/minecraft-client-linux-${SHORT_SHA}-debug
          mkdir -p "$BUNDLE/lib"

          # Copy the binary
          cp "$EXE_PATH" "$BUNDLE/Minecraft.Client.debug"

          # Collect non-system shared library dependencies and copy them in.
          ldd "$EXE_PATH" \
            | awk '/=>/ { print $3 }' \
            | grep -v '^(' \
            | grep -Ev '/(libc|libm|libdl|libpthread|librt|libgcc_s|libstdc\+\+|ld-linux)[^/]*\.so' \
            | sort -u \
            | while read -r lib; do
                [ -f "$lib" ] && cp "$lib" "$BUNDLE/lib/" || true
              done

          # Patch the binary RPATH so it finds libs in ./lib at runtime
          patchelf --set-rpath '$ORIGIN/lib' "$BUNDLE/Minecraft.Client.debug"

          # Keep a copy of the unstripped debug binary (symbols are already present in debug build)
          echo "Debug bundle ready: $BUNDLE"
          ls -lh "$BUNDLE" "$BUNDLE/lib"

      - name: Upload artifact
        uses: actions/upload-artifact@v4
        with:
          name: minecraft-client-linux-${{ github.sha }}
          path: |
            out/minecraft-client-linux-*/
            out/minecraft-client-linux-*-debug/
          retention-days: 7