embedded-charts 0.3.0

name: Performance Benchmarks

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]
  workflow_dispatch:
    inputs:
      compare_to:
        description: 'Branch/tag to compare performance against'
        required: false
        default: 'main'

env:
  CARGO_TERM_COLOR: always
  RUST_BACKTRACE: 1

jobs:
  benchmark:
    name: Run Performance Benchmarks
    runs-on: ubuntu-latest
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Install Rust toolchain
      uses: dtolnay/rust-toolchain@stable
      with:
        components: rustfmt, clippy
    
    - name: Cache cargo registry
      uses: actions/cache@v4
      with:
        path: ~/.cargo/registry
        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
    
    - name: Cache cargo index
      uses: actions/cache@v4
      with:
        path: ~/.cargo/git
        key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
    
    - name: Cache cargo build
      uses: actions/cache@v4
      with:
        path: target
        key: ${{ runner.os }}-cargo-build-bench-${{ hashFiles('**/Cargo.lock') }}
    
    # Install required system dependencies
    - name: Install system dependencies
      run: |
        sudo apt-get update
        sudo apt-get install -y libsdl2-dev
    
    # Run benchmarks and save results
    - name: Run benchmarks
      run: |
        cargo bench --all-features
    
    # Note: Benchmark comparison steps removed temporarily
    # The criterion baseline features need proper configuration
    
    # Upload benchmark results as artifacts
    - name: Upload benchmark results
      uses: actions/upload-artifact@v4
      with:
        name: benchmark-results
        path: target/criterion
        retention-days: 30
    
    # Comment on PR with performance changes (if significant)
    - name: Comment PR with benchmark results
      if: github.event_name == 'pull_request'
      uses: actions/github-script@v7
      with:
        script: |
          const fs = require('fs');
          const path = require('path');
          
          // Check if there are any significant performance changes
          // This is a simplified version - you might want to parse criterion output more carefully
          const comment = `## Performance Benchmark Results
          
          Benchmarks have been run comparing this PR against the base branch.
          
          Full results are available as artifacts in the [Actions tab](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}).
          
          To run benchmarks locally:
          \`\`\`bash
          cargo bench --all-features
          \`\`\``;
          
          github.rest.issues.createComment({
            issue_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
            body: comment
          });

  # Run memory-specific benchmarks on different feature combinations
  memory-benchmarks:
    name: Memory Usage Benchmarks
    runs-on: ubuntu-latest
    strategy:
      matrix:
        features:
          - "no_std,line,bar,minimal-memory"
          - "no_std,basic-charts,integer-math"
          - "std,basic-charts,floating-point"
          - "std,basic-charts,advanced-charts,animations"
    
    steps:
    - uses: actions/checkout@v4
    
    - name: Install Rust toolchain
      uses: dtolnay/rust-toolchain@stable
    
    - name: Install system dependencies
      run: |
        sudo apt-get update
        sudo apt-get install -y libsdl2-dev
    
    - name: Run memory benchmarks for ${{ matrix.features }}
      run: |
        cargo bench --no-default-features --features "${{ matrix.features }}" --bench memory_usage
    
    - name: Upload memory benchmark results
      uses: actions/upload-artifact@v4
      with:
        name: memory-benchmark-${{ strategy.job-index }}
        path: target/criterion/memory_usage
        retention-days: 30