name: 'Process Deployment File'
description: |
  Processes a Docker Compose or Stack deployment file by substituting placeholders
  with values from GitHub Action inputs, environment variables, and secrets.

inputs:
  compose_file:
    description: 'The deployment file to process (e.g., docker-compose.yml, prod.compose.yml)'
    required: true
  stack_name:
    description: 'Stack name to substitute in deployment file'
    required: true
  org_name:
    description: 'Organization name to substitute in deployment file'
    required: true
  repo_name:
    description: 'Repository name to substitute in deployment file'
    required: true
  git_sha:
    description: 'Git short SHA to substitute in deployment file'
    required: true

outputs:
  processed_file:
    description: 'Path to the processed deployment file'
    value: ${{ steps.process.outputs.processed_file }}

runs:
  using: 'composite'
  steps:
    - id: process
      shell: bash
      run: |
        set -euo pipefail

        INPUT_FILE="${{ inputs.compose_file }}"
        OUTPUT_FILE="${INPUT_FILE%.*}.processed.${INPUT_FILE##*.}"

        echo "DEBUG: Processing deployment file: $INPUT_FILE"
        if [ ! -f "$INPUT_FILE" ]; then
          echo "ERROR: Input file '$INPUT_FILE' does not exist."
          exit 1
        fi

        cp "$INPUT_FILE" "$OUTPUT_FILE"

        # Substitute variables from .env file if it exists
        if [ -f ".env" ]; then
          echo "DEBUG: Found .env file. Substituting variables from .env."
          while IFS='=' read -r VAR_NAME VAR_VALUE || [ -n "$VAR_NAME" ]; do
            [[ "$VAR_NAME" =~ ^#.*$ || -z "$VAR_NAME" ]] && continue
            VAR_VALUE=${VAR_VALUE//\"/}
            echo "DEBUG: Replacing \${$VAR_NAME} with value from .env"
            sed -i "s|\${$VAR_NAME}|$VAR_VALUE|g" "$OUTPUT_FILE"
          done < .env
        else
          echo "DEBUG: No .env file found. Skipping .env substitutions."
        fi

        # Substitute GitHub Actions inputs
        declare -A substitutions=(
          ["STACK_NAME"]="${{ inputs.stack_name }}"
          ["REPO_ORG"]="${{ inputs.org_name }}"
          ["REPO_NAME"]="${{ inputs.repo_name }}"
          ["GIT_SHA"]="${{ inputs.git_sha }}"
        )

        for VAR in "${!substitutions[@]}"; do
          VALUE="${substitutions[$VAR]}"
          echo "DEBUG: Replacing \${$VAR} with GitHub Action input value '$VALUE'"
          sed -i "s|\${$VAR}|$VALUE|g" "$OUTPUT_FILE"
        done

        # Substitute environment variables and secrets available in GitHub Actions environment
        echo "DEBUG: Substituting environment variables and secrets from GitHub Actions environment."
        env | while IFS='=' read -r ENV_VAR ENV_VAL; do
          if grep -q "\${$ENV_VAR}" "$OUTPUT_FILE"; then
            echo "DEBUG: Replacing \${$ENV_VAR} with environment variable value."
            sed -i "s|\${$ENV_VAR}|$ENV_VAL|g" "$OUTPUT_FILE"
          fi
        done

        echo "DEBUG: Final processed deployment file content:"
        cat "$OUTPUT_FILE"

        echo "processed_file=$OUTPUT_FILE" >> $GITHUB_OUTPUT