name: "Download an artifact"
description: "Custom download action"
inputs:
  name:
    description: "Artifact name"
    required: true
  path:
    description: "A directory to put artifact into"
    default: "."
    required: false
  skip-if-does-not-exist:
    description: "Allow to skip if file doesn't exist, fail otherwise"
    default: false
    required: false
  prefix:
    description: "S3 prefix. Default is '${GITHUB_RUN_ID}/${GITHUB_RUN_ATTEMPT}'"
    required: false

runs:
  using: "composite"
  steps:
    - name: Download artifact
      id: download-artifact
      shell: bash -euxo pipefail {0}
      env:
        TARGET: ${{ inputs.path }}
        ARCHIVE: /tmp/downloads/${{ inputs.name }}.tar.zst
        SKIP_IF_DOES_NOT_EXIST: ${{ inputs.skip-if-does-not-exist }}
        PREFIX: artifacts/${{ inputs.prefix || format('{0}/{1}/{2}', github.event.pull_request.head.sha || github.sha, github.run_id, github.run_attempt) }}
      run: |
        BUCKET=neon-github-public-dev
        FILENAME=$(basename $ARCHIVE)

        S3_KEY=$(aws s3api list-objects-v2 --bucket ${BUCKET} --prefix ${PREFIX%$GITHUB_RUN_ATTEMPT} | jq -r '.Contents[]?.Key' | grep ${FILENAME} | sort --version-sort | tail -1 || true)
        if [ -z "${S3_KEY}" ]; then
          if [ "${SKIP_IF_DOES_NOT_EXIST}" = "true" ]; then
            echo 'SKIPPED=true' >> $GITHUB_OUTPUT
            exit 0
          else
            echo >&2 "Neither s3://${BUCKET}/${PREFIX}/${FILENAME} nor its version from previous attempts exist"
            exit 1
          fi
        fi

        echo 'SKIPPED=false' >> $GITHUB_OUTPUT

        mkdir -p $(dirname $ARCHIVE)
        time aws s3 cp --only-show-errors s3://${BUCKET}/${S3_KEY} ${ARCHIVE}

    - name: Extract artifact
      if: ${{ steps.download-artifact.outputs.SKIPPED == 'false' }}
      shell: bash -euxo pipefail {0}
      env:
        TARGET: ${{ inputs.path }}
        ARCHIVE: /tmp/downloads/${{ inputs.name }}.tar.zst
      run: |
        mkdir -p ${TARGET}
        time tar -xf ${ARCHIVE} -C ${TARGET}
        rm -f ${ARCHIVE}