name: Check Script Diff(using /ee/maintained-apps/script-diff.sh)

on:
    pull_request:
        paths:
            - 'ee/maintained-apps/(inputs|outputs)/**.json'
        branches:
            - main

permissions:
    contents: read
    pull-requests: write

jobs:
    build:
        runs-on: ubuntu-latest
        
        steps:
            - uses: actions/checkout@v4
              with:
                fetch-depth: 0  # Fetch full history so merge base can be found
              
            - name: Get Changed Manifest Files # fetch the changed manifest files
              id: changed_files
              run: |
                echo "Fetching changed files..."
                git fetch origin main
                git diff --name-only origin/main...HEAD | grep -E 'ee/maintained-apps/(inputs|outputs)/.*\.json$' > changed_manifests.txt || true
                cat changed_manifests.txt
                if [ ! -s changed_manifests.txt ]; then
                    echo "No changed manifest files found."
                    exit 0
                fi
            - name: Run script-diff.sh on changed files
              id: run_script_diff
              run: |
                echo "Running script-diff.sh on changed manifest files..."
                > script_output.txt
                while read -r file; do
                  echo "=== Processing $file ===" | tee -a script_output.txt
                  ./ee/maintained-apps/script-diff.sh "$file" 2>&1 | tee -a script_output.txt || true
                  echo "" | tee -a script_output.txt
                done < changed_manifests.txt

            - name: Comment on PR
              uses: actions/github-script@v7
              with:
                script: |
                  const fs = require('fs');
                  const output = fs.readFileSync('script_output.txt', 'utf8').trim();
                  
                  // Check if output contains meaningful changes
                  // Skip if output only contains processing headers and "no changes" messages
                  const lines = output.split('\n').map(line => line.trim()).filter(line => line !== '');
                  const hasRealChanges = lines.some(line => {
                    return (!line.startsWith('=== Processing') && 
                            !line.includes('(no changes)') &&
                            !line.startsWith('===')) ||
                           line.includes('diff ') ||
                           line.startsWith('@@') ||
                           line.startsWith('+') ||
                           line.startsWith('-');
                  });
                  // separate fences for better readability
                  if (hasRealChanges) {
                    // Split content by processing headers and rebuild properly
                    const parts = output.split(/=== Processing (.+?) ===/);
                    let formattedOutput = '';
                    
                    // Skip first empty part, then process pairs of (filename, content)
                    for (let i = 1; i < parts.length; i += 2) {
                      const filename = parts[i];
                      const content = parts[i + 1] || '';
                      if (filename && content.trim()) {
                        formattedOutput += `### ${filename}\n\`\`\`diff\n${content.trim()}\n\`\`\`\n\n`;
                      }
                    }
                    
                    await github.rest.issues.createComment({
                      issue_number: context.issue.number,
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      body: `## Script Diff Results\n\n${formattedOutput.trim()}`
                    });
                    console.log('Posted comment with script diff results');
                  } else {
                    console.log('No meaningful changes detected, skipping comment');
                  }