# (C) Copyright IBM 2023, 2024.
#
# This code is part of Qiskit.
#
# This code is licensed under the Apache License, Version 2.0 with LLVM
# Exceptions. You may obtain a copy of this license in the LICENSE.txt
# file in the root directory of this source tree.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.
name: Build
on: [push, pull_request]

jobs:
  Build:
    runs-on: ubuntu-latest
    env:
      CONAN_USER_HOME: ${{ github.workspace }}
    steps:
      - name: free-up-space
        run: |
          df -h
          sudo rm -rf /usr/share/dotnet
          sudo rm -rf /opt/ghc
          sudo rm -rf "/usr/local/share/boost"
          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
          df -h
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.10.9'
      - name: Install pip packages
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements-dev.txt
      - name: Export QSSC_VERSION from Git version tag
        run: |
          version=`python -c "from setuptools_scm import get_version; print(get_version())"`
          echo "QSSC_VERSION=$version" >> $GITHUB_ENV
      - name: Prepare Conan
        run: |
          conan profile new default --detect || true
          conan profile update settings.compiler.libcxx=libstdc++11 default
          # Add QASM, LLVM, and clang tools recipes to Conan cache.
          ./conan_deps.sh
          conan lock create conanfile.py -pr:h default -pr:b default --build=outdated
      - name: Load Conan cache
        id: cache
        uses: actions/cache/restore@v3
        with:
          path: .conan
          key: conan-${{ runner.os }}
          restore-keys: conan-${{ runner.os }}-${{ hashFiles('conan.lock') }}
      - name: Create build dir
        run: mkdir build
      # Check if all conan packages are within the cache. If not
      # we will need to build packages (and if on main flush the cache)
      - name : Check Conan dependencies are cached
        id: check_conan_cache
        working-directory: build
        run: |
          conan info .. -pr:h default -pr:b default --build=outdated --json build_requires.json
          build_requires=$(cat build_requires.json)
          if [[ "$build_requires" == *"[]"* ]];
          then
              all_in_cache=true
          else
              all_in_cache=false
          fi
          echo "all_in_cache=$all_in_cache" >> $GITHUB_OUTPUT
          echo "Conan build requires: $build_requires"
          echo "Conan cache is complete: $all_in_cache"
      # If we have a cache miss on 'main', clear the cache.
      # A dependency was updated, so we need to drop the old one
      # to prevent unbounded cache growth over time.
      - name : Clear Conan cache
        if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.check_conan_cache.outputs.all_in_cache != 'true'
        run: |
          rm -rf ./.conan
          # Re-add conan deps after flushing the conan cache before building packages.
          conan profile new default --detect || true
          conan profile update settings.compiler.libcxx=libstdc++11 default
          ./conan_deps.sh
          conan lock create conanfile.py -pr:h default -pr:b default --build=outdated
      - name: Conan install
        id: conan_install
        working-directory: build
        run: |
          export CONAN_LLVM_GIT_CACHE="${{ runner.temp }}/llvm-project"
          conan install .. --build=outdated -pr:h default -pr:b default
      - name: Build
        id: build
        working-directory: build
        run: |
          conan build ..
      - name: Test
        id: test
        working-directory: build
        run: conan build .. --test
      # On 'main' branch, always save the cache if Conan install succeeded.
      # Note: we only update the cache from 'main' to avoid "cache thrashing", which would result in the 'main'
      #       cache getting LRU-evicted for every PR, since a single run uses most of the 10GB repo limit.
      - uses: actions/cache/save@v3
        if: always() && (github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.conan_install.outcome == 'success' && steps.check_conan_cache.outputs.all_in_cache != 'true')
        with:
          path: .conan
          key: conan-${{ runner.os }}-${{ hashFiles('conan.lock') }}
