name: 'Prepare Env File'
description: 'Creates or updates a .env file with specified environment variables and outputs its base64-encoded content.'

inputs:
  stack_name:
    description: 'The name of the stack to set in the .env file.'
    required: true

outputs:
  exists:
    description: 'Indicates whether the .env file existed before running this action.'
    value: ${{ steps.prepare.outputs.exists }}
  content:
    description: 'Base64-encoded content of the resulting .env file.'
    value: ${{ steps.encode.outputs.content }}

runs:
  using: 'composite'
  steps:
    - id: prepare
      shell: bash
      run: |
        set -euo pipefail
        if [ -f ".env" ]; then
          echo "exists=true" >> $GITHUB_OUTPUT
          echo "DEBUG: .env file exists. Updating STACK_NAME."
        else
          echo "exists=false" >> $GITHUB_OUTPUT
          echo "DEBUG: .env file does not exist. Creating new .env file."
          touch .env
        fi

        if grep -q "^STACK_NAME=" .env; then
          sed -i "s/^STACK_NAME=.*/STACK_NAME=${{ inputs.stack_name }}/" .env
          echo "DEBUG: Updated existing STACK_NAME to '${{ inputs.stack_name }}'."
        else
          echo "STACK_NAME=${{ inputs.stack_name }}" >> .env
          echo "DEBUG: Added STACK_NAME='${{ inputs.stack_name }}' to .env."
        fi

        echo "DEBUG: Final .env content:"
        cat .env

    - id: encode
      shell: bash
      run: |
        set -euo pipefail
        ENV_BASE64=$(base64 -w 0 .env)
        echo "content=$ENV_BASE64" >> $GITHUB_OUTPUT
        echo "DEBUG: Successfully encoded .env file to base64."