---
name: Detect Plugin Extension Changes

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions: {}

on:
  pull_request:
    branches:
      - 'main'
    paths:
      - 'packages/**'
      - 'public/**'

env:
  # Space-separated list of keywords referring to plugin extensions
  PLUGIN_EXTENSION_KEYWORDS: "usePluginLinks, usePluginComponent, usePluginComponents, usePluginFunctions, PluginExtensionPoints"

jobs:
  detect-plugin-extension-changes:
    name: Detect Plugin Extension Changes
    runs-on: ubuntu-latest
    permissions:
      contents: read
      id-token: write
    if: github.event.pull_request.head.repo.full_name == github.repository

    steps:
      - uses: actions/checkout@v5
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Check for plugin extension changes
        id: check-changes
        uses: actions/github-script@v7
        with:
          script: |
            const { execSync } = require('child_process');
            const fs = require('fs');
            
            // Plugin extension keywords from environment
            const keywords = process.env.PLUGIN_EXTENSION_KEYWORDS.split(',');
            const baseSha = '${{ github.event.pull_request.base.sha }}';
            const headSha = '${{ github.event.pull_request.head.sha }}';
            
            console.log('Checking for plugin extension changes...');
            console.log('Keywords:', keywords);
            
            // Get changed files in packages/ and public/ directories
            let changedFiles = [];
            const diffOutput = execSync(
              `git diff --name-only ${baseSha}...${headSha} -- packages/ public/`,
              { encoding: 'utf8' }
            ).trim();
            
            if (diffOutput) {
              changedFiles = diffOutput.split('\n').filter(file => {
                // Validate file path and ensure it's in target directories
                return file.match(/^(packages\/|public\/)/) && 
                        file.match(/^[a-zA-Z0-9._/-]+$/) && 
                        fs.existsSync(file);
              });
            }
            
            console.log('Changed files to check:', changedFiles);
            
            // Check each file for plugin extension keywords
            const filesWithChanges = new Set();
            let hasPluginExtensionChanges = false;
            
            for (const file of changedFiles) {
              try {
                // Get the diff for this specific file
                const fileDiff = execSync(
                  `git diff ${baseSha}...${headSha} -- "${file}"`,
                  { encoding: 'utf8' }
                );
                
                // Check if any keywords are in the diff
                for (const keyword of keywords) {
                  if (fileDiff.includes(keyword)) {
                    console.log(`Found ${keyword} in ${file}`);
                    filesWithChanges.add(file);
                    hasPluginExtensionChanges = true;
                    break; // Found at least one keyword, move to next file
                  }
                }
              } catch (error) {
                console.log(`Error checking file ${file}:`, error.message);
              }
            }
            
            // Set outputs
            const filesArray = Array.from(filesWithChanges);
            const formattedFiles = filesArray.length > 0 
              ? '`' + filesArray.join('`\\n- `') + '`'
              : '';
            
            core.setOutput('plugin_extension_changes', hasPluginExtensionChanges.toString());
            core.setOutput('formatted_changed_files', formattedFiles);

            if (hasPluginExtensionChanges) {
              console.log('The following files have changes that may affect plugin extensions:');
              console.log(filesArray);
            } else {
              console.log('No changes detected in core Grafana extensions or extension points.');
            }

      - name: Send Slack Message via Payload
        id: slack
        if: steps.check-changes.outputs.plugin_extension_changes == 'true'
        uses: grafana/shared-workflows/actions/send-slack-message@0941e3408fa4789fec9062c44a2a9e1832146ba6 #v2.0.1
        with:
          method: chat.postMessage
          payload-templated: true
          payload: |
            {
              "channel": "C031SLFH6G0",
              "text": "Plugin Extension changes in core Grafana *PR:* <${{ github.event.pull_request.html_url }}|#${{ github.event.pull_request.number }} :information_source:",
              "icon_emoji": ":grot:",
              "username": "Plugin Extension Bot",
              "blocks": [
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "*Plugin Extensions:* possible changes to extension points in core Grafana."
                  }
                },
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "*PR:* <${{ github.event.pull_request.html_url }}|#${{ github.event.pull_request.number }}>\n*Job:* <${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}|View Job>\n*Author:* ${{ github.event.pull_request.user.login }}"
                  }
                },
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "*File(s) with changes:*\n- ${{ steps.check-changes.outputs.formatted_changed_files }}"
                  }
                },
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "*What to do?*\nMake sure that:\n- All extension point ids start with `grafana/`\n- All extension point ids are exposed via <https://github.com/grafana/grafana/blob/main/packages/grafana-data/src/types/pluginExtensions.ts#L183|the `PluginExtensionPoints` enum in grafana-data>\n- Core Grafana is not registering extensions to extension points offered by plugins"
                  }
                }
              ]
            }