name: Send Screenshots to Pixel Eagle

on:
  workflow_call:
    inputs:
      artifact:
        required: true
        type: string
      commit:
        required: true
        type: string
      branch:
        required: true
        type: string
      os:
        required: true
        type: string

env:
  # Unfortunately, we can't check secrets in `if:` conditionals. However, Github's own documentation
  # suggests a workaround: Putting the secret in an environment variable, and checking that instead.
  PIXELEAGLE_TOKEN_EXISTS: ${{ secrets.PIXELEAGLE_TOKEN != '' }}

jobs:
  send-to-pixel-eagle:
    name: Send screenshots to Pixel Eagle
    runs-on: ubuntu-24.04
    # Pixel Eagle is irrelevant for most forks, even of those that allow workflows to run. Thus, we
    # disable this job for any forks. Any forks where Pixel Eagle is relevant can comment out the
    # `if:` conditional below.
    if: ${{ github.repository == 'bevyengine/bevy' }}
    steps:
      - name: Notify user on non-existent token
        if: ${{ ! fromJSON(env.PIXELEAGLE_TOKEN_EXISTS) }}
        run: |
          echo "The PIXELEAGLE_TOKEN secret does not exist, so uploading screenshots to Pixel Eagle was skipped." >> $GITHUB_STEP_SUMMARY
      
      - name: Download artifact
        if: ${{ fromJSON(env.PIXELEAGLE_TOKEN_EXISTS) }}
        uses: actions/download-artifact@v4
        with:
          pattern: ${{ inputs.artifact }}
      
      - name: Send to Pixel Eagle
        if: ${{ fromJSON(env.PIXELEAGLE_TOKEN_EXISTS) }}
        env:
          project: B04F67C0-C054-4A6F-92EC-F599FEC2FD1D
        run: |
          # Create a new run with its associated metadata
          metadata='{"os":"${{ inputs.os }}", "commit": "${{ inputs.commit }}", "branch": "${{ inputs.branch }}"}'
          run=`curl https://pixel-eagle.vleue.com/$project/runs --json "$metadata" --oauth2-bearer ${{ secrets.PIXELEAGLE_TOKEN }} | jq '.id'`
          
          SAVEIFS=$IFS
          
          cd ${{ inputs.artifact }}
          
          # Read the hashes of the screenshot for fast comparison when they are equal
          IFS=$'\n'
          # Build a json array of screenshots and their hashes
          hashes='[';
          for screenshot in $(find . -type f -name "*.png");
          do
            name=${screenshot:14}
            echo $name
            hash=`shasum -a 256 $screenshot | awk '{print $1}'`
            hashes="$hashes [\"$name\",\"$hash\"],"
          done
          hashes=`echo $hashes | rev | cut -c 2- | rev`
          hashes="$hashes]"
          
          IFS=$SAVEIFS

          # Upload screenshots with unknown hashes
          curl https://pixel-eagle.vleue.com/$project/runs/$run/hashes --json "$hashes" --oauth2-bearer ${{ secrets.PIXELEAGLE_TOKEN }} | jq '.[]|[.name] | @tsv' |
            while IFS=$'\t' read -r name; do
              name=`echo $name | tr -d '"'`
              echo "Uploading $name"
              curl https://pixel-eagle.vleue.com/$project/runs/$run/screenshots -F "data=@./screenshots-$name" -F "screenshot=$name" --oauth2-bearer ${{ secrets.PIXELEAGLE_TOKEN }}
              echo
            done
          
          IFS=$SAVEIFS

          cd ..

          # Trigger comparison with the main branch on the same os
          curl https://pixel-eagle.vleue.com/$project/runs/$run/compare/auto --json '{"os":"<equal>", "branch": "main"}' --oauth2-bearer ${{ secrets.PIXELEAGLE_TOKEN }} > pixeleagle.json

          # Log results
          compared_with=`cat pixeleagle.json | jq '.to'`

          status=0
          missing=`cat pixeleagle.json | jq '.missing | length'`
          if [ ! $missing -eq 0 ]; then
            echo "There are $missing missing screenshots"
            echo "::warning title=$missing missing screenshots on ${{ inputs.os }}::https://pixel-eagle.vleue.com/$project/runs/$run/compare/$compared_with"
            status=1
          fi

          diff=`cat pixeleagle.json | jq '.diff | length'`
          if [ ! $diff -eq 0 ]; then
            echo "There are $diff screenshots with a difference"
            echo "::warning title=$diff different screenshots on ${{ inputs.os }}::https://pixel-eagle.vleue.com/$project/runs/$run/compare/$compared_with"
            status=1
          fi

          echo "created run $run: https://pixel-eagle.vleue.com/$project/runs/$run/compare/$compared_with"

          exit $status