name: "AWS Lambda - Update Alias"
description: >
  Updates Lambda function aliases from a Terraform output.
  Iterates over the lambda_alias_updates Terraform output and calls
  aws lambda update-alias for each entry.

inputs:
  lambda-alias-updates:
    description: >
      JSON array of Lambda alias update objects (Terraform output: lambda_alias_updates).
      Each element is a JSON-encoded string with alias_name, function_name, and version.
    required: true

runs:
  using: "composite"
  steps:
    - name: Install AWS CLI
      shell: bash
      run: |
        if ! command -v aws &> /dev/null; then
          curl -fsSL "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o /tmp/awscliv2.zip
          unzip -q /tmp/awscliv2.zip -d /tmp
          sudo /tmp/aws/install
          rm -rf /tmp/awscliv2.zip /tmp/aws
        fi

    - name: Install jq if missing
      shell: bash
      run: |
        set -euo pipefail
        command -v jq >/dev/null 2>&1 || sudo apt-get install -y --no-install-recommends jq

    - name: Update Lambda Aliases
      shell: bash
      env:
        LAMBDA_ALIAS_UPDATES: ${{ inputs.lambda-alias-updates }}
      run: |
        echo "$LAMBDA_ALIAS_UPDATES" | jq -c '.[] | fromjson' | while IFS= read -r entry; do
          alias_name=$(echo "$entry" | jq -r '.alias_name')
          function_name=$(echo "$entry" | jq -r '.function_name')
          version=$(echo "$entry" | jq -r '.version')
          echo "Updating alias '$alias_name' for '$function_name' to version '$version'"
          aws lambda update-alias \
            --no-cli-pager \
            --name "$alias_name" \
            --function-name "$function_name" \
            --function-version "$version"
          echo "Updated alias '$alias_name' for '$function_name' to version '$version'"
        done