# .github/workflows/github-metrics-notify.yml

name: GitHub Metrics Notification

# Grants specific permissions to the GITHUB_TOKEN
permissions:
  contents: write         # Allows pushing changes to the repository
  issues: read            # Optional: if you're interacting with issues
  pull-requests: write    # Optional: if you're interacting with pull requests

# Triggers the workflow on specific GitHub events and schedules it as a backup
on:
  # Trigger on repository star events
  watch:
    types: [started, deleted] # 'started' for star, 'deleted' for unstar

  # Trigger on repository forks
  fork:

  # Trigger on issue events
  issues:
    types: [opened, closed, reopened, edited]

  # Trigger on pull request events
  pull_request:
    types: [opened, closed, reopened, edited]

  # Trigger on release events
  release:
    types: [published, edited, prereleased, released]

  # Trigger on push events to the main branch
  push:
    branches:
      - main

  # Scheduled backup trigger every hour for followers/subscribers
  schedule:
    - cron: '0 */1 * * *' # Every hour at minute 0

  # Allows manual triggering
  workflow_dispatch:

jobs:
  notify_metrics:
    runs-on: ubuntu-latest

    steps:
      # Step 1: Checkout the repository
      - name: Checkout Repository
        uses: actions/checkout@v3
        with:
          persist-credentials: true # Enables Git commands to use GITHUB_TOKEN
          fetch-depth: 0            # Fetch all history for accurate metric tracking

      # Step 2: Set Up Python Environment
      - name: Set Up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.x'     # Specify the Python version

      # Step 3: Install Python Dependencies
      - name: Install Dependencies
        run: |
          python -m pip install --upgrade pip
          pip install requests

      # Step 4: Fetch and Compare Metrics
      - name: Fetch and Compare Metrics
        id: fetch_metrics
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}               # Built-in secret provided by GitHub Actions
          DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }} # Your Discord webhook URL
          GITHUB_EVENT_NAME: ${{ github.event_name }}             # To determine if run is manual or triggered by an event
          GITHUB_REPOSITORY_OWNER: ${{ github.repository_owner }} # Dynamic repository owner
        run: |
          python3 - <<'EOF' > fetch_metrics.out
          import os
          import requests
          import json
          from datetime import datetime

          # Configuration
          REPO_OWNER = os.getenv('GITHUB_REPOSITORY_OWNER')
          REPO_NAME = os.getenv('GITHUB_REPOSITORY').split('/')[-1]
          METRICS_FILE = ".github/metrics.json"

          # Ensure .github directory exists
          os.makedirs(os.path.dirname(METRICS_FILE), exist_ok=True)

          # GitHub API Headers
          headers = {
              "Authorization": f"token {os.getenv('GITHUB_TOKEN')}",
              "Accept": "application/vnd.github.v3+json"
          }

          # Function to fetch closed issues count using GitHub Search API
          def fetch_closed_issues(owner, repo, headers):
              search_api = f"https://api.github.com/search/issues?q=repo:{owner}/{repo}+type:issue+state:closed"
              try:
                  response = requests.get(search_api, headers=headers)
                  response.raise_for_status()
                  data = response.json()
                  return data.get('total_count', 0)
              except requests.exceptions.RequestException as e:
                  print(f"Error fetching closed issues count: {e}")
                  return 0

          # Fetch current metrics from GitHub API
          repo_api = f"https://api.github.com/repos/{REPO_OWNER}/{REPO_NAME}"

          try:
              response = requests.get(repo_api, headers=headers)
              response.raise_for_status()
              repo_data = response.json()
              stars = repo_data.get('stargazers_count', 0)
              forks = repo_data.get('forks_count', 0)
              followers = repo_data.get('subscribers_count', 0)
              open_issues = repo_data.get('open_issues_count', 0)
              closed_issues = fetch_closed_issues(REPO_OWNER, REPO_NAME, headers)
          except requests.exceptions.RequestException as e:
              print(f"Error fetching repository data: {e}")
              exit(1)

          # Function to load previous metrics with error handling
          def load_previous_metrics(file_path):
              try:
                  with open(file_path, 'r') as file:
                      return json.load(file)
              except json.decoder.JSONDecodeError:
                  print("metrics.json is corrupted or empty. Reinitializing.")
                  return {
                      "stars": 0,
                      "forks": 0,
                      "followers": 0,
                      "open_issues": 0,
                      "closed_issues": 0
                  }
              except FileNotFoundError:
                  return {
                      "stars": 0,
                      "forks": 0,
                      "followers": 0,
                      "open_issues": 0,
                      "closed_issues": 0
                  }

          # Load previous metrics
          prev_metrics = load_previous_metrics(METRICS_FILE)
          is_initial_run = not os.path.exists(METRICS_FILE)

          # Determine changes (both increases and decreases)
          changes = {}
          metrics = ["stars", "forks", "followers", "open_issues", "closed_issues"]
          current_metrics = {
              "stars": stars,
              "forks": forks,
              "followers": followers,
              "open_issues": open_issues,
              "closed_issues": closed_issues
          }

          for metric in metrics:
              current = current_metrics.get(metric, 0)
              previous = prev_metrics.get(metric, 0)
              if current != previous:
                  changes[metric] = current - previous

          # Update metrics file
          with open(METRICS_FILE, 'w') as file:
              json.dump(current_metrics, file)

          # Determine if a notification should be sent
          event_name = os.getenv('GITHUB_EVENT_NAME')
          send_notification = False
          no_changes = False
          initial_setup = False

          if is_initial_run:
              if event_name == 'workflow_dispatch':
                  # Manual run: Send notification for initial setup
                  send_notification = True
                  initial_setup = True
              elif event_name == 'watch' and changes.get('stars'):
                  # Initial run triggered by a star event: Send notification
                  send_notification = True
              else:
                  # Event-triggered runs: Do not send notification on initial setup
                  send_notification = False
          else:
              if event_name == 'workflow_dispatch':
                  # Manual run: Always send notification
                  send_notification = True
                  if not changes:
                      no_changes = True
              elif event_name == 'watch':
                  # Star event: Send notification only if stars changed
                  if changes.get('stars'):
                      send_notification = True
              else:
                  # Scheduled run or other events: Send notification only if there are changes
                  if changes:
                      send_notification = True

          if send_notification:
              triggering_actor = os.getenv('GITHUB_ACTOR', 'Unknown')

              # Prepare Discord notification payload
              payload = {
                  "embeds": [
                      {
                          "title": "📈 GitHub Repository Metrics Updated",
                          "url": f"https://github.com/{REPO_OWNER}/{REPO_NAME}",  # Link back to the repository
                          "color": 0x7289DA,  # Discord blurple color
                          "thumbnail": {
                              "url": "https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png"  # GitHub logo
                          },
                          "fields": [
                              {
                                  "name": "📂 Repository",
                                  "value": f"[{REPO_OWNER}/{REPO_NAME}](https://github.com/{REPO_OWNER}/{REPO_NAME})",
                                  "inline": False
                              },
                              {
                                  "name": "⭐ Stars",
                                  "value": f"{stars}",
                                  "inline": True
                              },
                              {
                                  "name": "🍴 Forks",
                                  "value": f"{forks}",
                                  "inline": True
                              },
                              {
                                  "name": "👥 Followers",
                                  "value": f"{followers}",
                                  "inline": True
                              },
                              {
                                  "name": "🐛 Open Issues",
                                  "value": f"{open_issues}",
                                  "inline": True
                              },
                              {
                                  "name": "🔒 Closed Issues",
                                  "value": f"{closed_issues}",
                                  "inline": True
                              },
                              {
                                  "name": "👤 Triggered By",
                                  "value": triggering_actor,
                                  "inline": False
                              },
                          ],
                          "footer": {
                              "text": "GitHub Metrics Monitor",
                              "icon_url": "https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png"  # GitHub logo
                          },
                          "timestamp": datetime.utcnow().isoformat()  # Adds a timestamp to the embed
                      }
                  ]
              }

              if initial_setup:
                  # Add a field indicating initial setup
                  payload["embeds"][0]["fields"].append({
                      "name": "⚙️ Initial Setup",
                      "value": "Metrics tracking has been initialized.",
                      "inline": False
                  })
              elif changes:
                  # Add fields for each updated metric
                  for metric, count in changes.items():
                      emoji = {
                          "stars": "⭐",
                          "forks": "🍴",
                          "followers": "👥",
                          "open_issues": "🐛",
                          "closed_issues": "🔒"
                      }.get(metric, "")
                      change_symbol = "+" if count > 0 else ""
                      payload["embeds"][0]["fields"].append({
                          "name": f"{emoji} {metric.replace('_', ' ').capitalize()} (Change)",
                          "value": f"{change_symbol}{count}",
                          "inline": True
                      })
              elif no_changes:
                  # Indicate that there were no changes during a manual run
                  payload["embeds"][0]["fields"].append({
                      "name": "✅ No Changes",
                      "value": "No updates to metrics since the last check.",
                      "inline": False
                  })

              # Save payload to a temporary file for the next step
              with open('payload.json', 'w') as f:
                  json.dump(payload, f)

              # Output whether to send notification
              if initial_setup or changes or no_changes:
                  print("SEND_NOTIFICATION=true")
              else:
                  print("SEND_NOTIFICATION=false")
          else:
              print("SEND_NOTIFICATION=false")
          EOF

      # Step 5: Ensure .gitignore Ignores Temporary Files
      - name: Ensure .gitignore Ignores Temporary Files
        run: |
          # Check if .gitignore exists; if not, create it
          if [ ! -f .gitignore ]; then
            touch .gitignore
          fi

          # Add 'fetch_metrics.out' if not present
          if ! grep -Fxq "fetch_metrics.out" .gitignore; then
            echo "fetch_metrics.out" >> .gitignore
            echo "Added 'fetch_metrics.out' to .gitignore"
          else
            echo "'fetch_metrics.out' already present in .gitignore"
          fi

          # Add 'payload.json' if not present
          if ! grep -Fxq "payload.json" .gitignore; then
            echo "payload.json" >> .gitignore
            echo "Added 'payload.json' to .gitignore"
          else
            echo "'payload.json' already present in .gitignore"
          fi

      # Step 6: Decide Whether to Send Notification
      - name: Check if Notification Should Be Sent
        id: decide_notification
        run: |
            if grep -q "SEND_NOTIFICATION=true" fetch_metrics.out; then
              echo "send=true" >> $GITHUB_OUTPUT
            else
              echo "send=false" >> $GITHUB_OUTPUT
            fi
        shell: bash

      # Step 7: Send Discord Notification using curl
      - name: Send Discord Notification
        if: steps.decide_notification.outputs.send == 'true'
        run: |
          curl -H "Content-Type: application/json" -d @payload.json ${{ secrets.DISCORD_WEBHOOK_URL }}

      # Step 8: Commit and Push Updated metrics.json and .gitignore
      - name: Commit and Push Changes
        if: steps.decide_notification.outputs.send == 'true'
        run: |
          git config --global user.name "GitHub Actions"
          git config --global user.email "actions@github.com"
          
          # Stage metrics.json
          git add .github/metrics.json
          
          # Stage .gitignore only if it was modified
          if git diff --name-only | grep -q "^\.gitignore$"; then
            git add .gitignore
          else
            echo ".gitignore not modified"
          fi
          
          # Commit changes if there are any
          git commit -m "Update metrics.json and ensure temporary files are ignored [skip ci]" || echo "No changes to commit"
          
          # Push changes to the main branch
          git push origin main  # Replace 'main' with your default branch if different

      # Step 9: Clean Up Temporary Files
      - name: Clean Up Temporary Files
        if: always()
        run: |
          rm -f fetch_metrics.out payload.json