name: Release Homebrew Tap for Buster CLI

on:
  workflow_call:
    inputs:
      tag:
        required: true
        type: string
    secrets:
      homebrew_tap_rw: # Secret for pushing to buster-so/buster-homebrew
        required: true
  workflow_dispatch:
    inputs:
      tag:
        description: 'The release tag to use (e.g., v0.1.0)'
        required: true
        type: string

permissions:
  contents: write # Allows the workflow to commit to the tap repository if using GITHUB_TOKEN, though homebrew_tap_rw is primary for cross-repo

jobs:
  release:
    runs-on: blacksmith 
    steps:
    - name: Checkout Homebrew tap repository
      uses: actions/checkout@v4
      with:
        repository: buster-so/buster-homebrew # Target tap repository
        ref: 'main' # Or your default branch for the tap
        token: ${{ secrets.homebrew_tap_rw }}

    - name: Download macOS ARM64 package
      uses: robinraju/release-downloader@v1.12
      with:
        repository: "buster-so/buster" # Source of the CLI releases
        tag: ${{ inputs.tag }} # e.g., v0.1.0
        fileName: "buster-cli-darwin-arm64.tar.gz" # Exact asset name

    - name: Download macOS Intel package
      uses: robinraju/release-downloader@v1.12
      with:
        repository: "buster-so/buster"
        tag: ${{ inputs.tag }}
        fileName: "buster-cli-darwin-x86_64.tar.gz"

    - name: Download Linux Intel package
      uses: robinraju/release-downloader@v1.12
      with:
        repository: "buster-so/buster"
        tag: ${{ inputs.tag }}
        fileName: "buster-cli-linux-x86_64.tar.gz"

    - name: Generate and Push Formula File
      run: |
        set -e # Exit immediately if a command exits with a non-zero status.

        echo "Calculating SHA256 checksums..."
        darwin_arm64_hash=$(shasum -a 256 buster-cli-darwin-arm64.tar.gz | awk '{ print $1 }')
        darwin_x86_64_hash=$(shasum -a 256 buster-cli-darwin-x86_64.tar.gz | awk '{ print $1 }')
        linux_x86_64_hash=$(shasum -a 256 buster-cli-linux-x86_64.tar.gz | awk '{ print $1 }')

        echo "Darwin ARM64 SHA: ${darwin_arm64_hash}"
        echo "Darwin x86_64 SHA: ${darwin_x86_64_hash}"
        echo "Linux x86_64 SHA: ${linux_x86_64_hash}"

        input_tag="${{ inputs.tag }}"
        # Strip the leading 'v' if present, to get the version number like "0.1.0"
        version="${input_tag#v}"
        echo "Input tag: ${input_tag}, Version: ${version}"

        formula_file="Formula/buster.rb" # Name of the formula file in the tap repository

        echo "Generating ${formula_file}..."
        echo '# typed: false' > "${formula_file}"
        echo '# frozen_string_literal: true' >> "${formula_file}"
        echo '' >> "${formula_file}"
        echo 'class Buster < Formula' >> "${formula_file}"
        echo '  desc "Command-line interface for using buster Buster"' >> "${formula_file}"
        echo '  homepage "https://github.com/buster-so/buster"' >> "${formula_file}"
        echo "  version \"${version}\"" >> "${formula_file}"
        echo '  license "MIT"' >> "${formula_file}"
        echo '' >> "${formula_file}"
        echo '  livecheck do' >> "${formula_file}"
        echo '    url :stable' >> "${formula_file}"
        echo '    strategy :github_latest' >> "${formula_file}"
        echo '    regex(/^v?(\d+(?:\.\d+)*)$/i)' >> "${formula_file}"
        echo '  end' >> "${formula_file}"
        echo '' >> "${formula_file}"
        echo '  on_macos do' >> "${formula_file}"
        echo '    on_arm do' >> "${formula_file}"
        echo "      url \"https://github.com/buster-so/buster/releases/download/${input_tag}/buster-cli-darwin-arm64.tar.gz\"" >> "${formula_file}"
        echo "      sha256 \"${darwin_arm64_hash}\"" >> "${formula_file}"
        echo '    end' >> "${formula_file}"
        echo '    on_intel do' >> "${formula_file}"
        echo "      url \"https://github.com/buster-so/buster/releases/download/${input_tag}/buster-cli-darwin-x86_64.tar.gz\"" >> "${formula_file}"
        echo "      sha256 \"${darwin_x86_64_hash}\"" >> "${formula_file}"
        echo '    end' >> "${formula_file}"
        echo '  end' >> "${formula_file}"
        echo '' >> "${formula_file}"
        echo '  on_linux do' >> "${formula_file}"
        echo "    url \"https://github.com/buster-so/buster/releases/download/${input_tag}/buster-cli-linux-x86_64.tar.gz\"" >> "${formula_file}"
        echo "    sha256 \"${linux_x86_64_hash}\"" >> "${formula_file}"
        echo '  end' >> "${formula_file}"
        echo '' >> "${formula_file}"
        echo '  def install' >> "${formula_file}"
        echo '    bin.install "buster-cli" => "buster"' >> "${formula_file}"
        echo '  end' >> "${formula_file}"
        echo '' >> "${formula_file}"
        echo '  test do' >> "${formula_file}"
        echo '    assert_match "buster", shell_output("#{bin}/buster --help")' >> "${formula_file}"
        echo '  end' >> "${formula_file}"
        echo 'end' >> "${formula_file}"
        # Ensure a final newline, some linters prefer it
        echo '' >> "${formula_file}"

        echo "--- Generated ${formula_file} ---"
        cat "${formula_file}"
        echo "---------------------------"

        echo "Configuring git..."
        git config user.name "Buster CLI Release Workflow"
        git config user.email "actions@github.com"

        echo "Adding and committing ${formula_file}..."
        git add "${formula_file}"
        
        # Check if there are changes to commit
        if git diff --staged --quiet; then
          echo "No changes to commit to ${formula_file}."
        else
          git commit -m "Update ${formula_file} for version ${input_tag}"
          echo "Pushing changes..."
          git push
          echo "Pushed updated ${formula_file} for version ${input_tag} to buster-so/buster-homebrew"
        fi