name: Update Cursor Version

on:
  schedule:
    - cron: '0 12 * * *'  # Run daily at 12:00 UTC
  workflow_dispatch:  # Allow manual triggering

jobs:
  update-cursor:
    runs-on: ubuntu-latest
    
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4
      with:
        token: ${{ secrets.GITHUB_TOKEN }}
    
    - name: Setup Nix
      uses: cachix/install-nix-action@v25
      with:
        nix_path: nixpkgs=channel:nixpkgs-unstable
    
    - name: Install dependencies
      run: |
        nix-env -iA nixpkgs.curl nixpkgs.jq nixpkgs.nix-prefetch-url
    
    - name: Get latest Cursor version
      id: get_version
      run: |
        set -euo pipefail
        
        # Get the latest version from Cursor's API redirect with retries
        for i in {1..3}; do
          echo "Attempt $i: Fetching latest version from Cursor API..."
          if REDIRECT_URL=$(curl -s -I --max-time 30 "https://api2.cursor.sh/updates/download/golden/linux-x64/cursor/latest" | grep -i location | cut -d' ' -f2 | tr -d '\r\n' 2>/dev/null); then
            if [[ -n "$REDIRECT_URL" ]]; then
              # Extract version from URL like: .../Cursor-1.7.39-x86_64.AppImage
              LATEST_VERSION=$(echo "$REDIRECT_URL" | grep -o 'Cursor-[0-9]\+\.[0-9]\+\.[0-9]\+' | sed 's/Cursor-//' 2>/dev/null)
              if [[ -n "$LATEST_VERSION" ]]; then
                echo "Latest version: $LATEST_VERSION"
                echo "version=$LATEST_VERSION" >> $GITHUB_OUTPUT
                break
              fi
            fi
          fi
          
          if [[ $i -eq 3 ]]; then
            echo "Error: Failed to fetch latest version after 3 attempts"
            exit 1
          fi
          
          echo "Retrying in 10 seconds..."
          sleep 10
        done
        
        # Get current version from flake.nix
        CURRENT_VERSION=$(grep -o 'version = "[^"]*"' flake.nix | head -1 | cut -d'"' -f2)
        echo "Current version: $CURRENT_VERSION"
        echo "current_version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
    
    - name: Check if update is needed
      id: check_update
      run: |
        if [ "${{ steps.get_version.outputs.version }}" != "${{ steps.get_version.outputs.current_version }}" ]; then
          echo "update_needed=true" >> $GITHUB_OUTPUT
          echo "Update needed: ${{ steps.get_version.outputs.current_version }} -> ${{ steps.get_version.outputs.version }}"
        else
          echo "update_needed=false" >> $GITHUB_OUTPUT
          echo "No update needed. Current version is up to date."
        fi
    
    - name: Update flake.nix
      if: steps.check_update.outputs.update_needed == 'true'
      run: |
        set -euo pipefail
        
        VERSION="${{ steps.get_version.outputs.version }}"
        
        # Construct the download URL for the AppImage
        APPIMAGE_URL="https://api2.cursor.sh/updates/download/golden/linux-x64/cursor/$VERSION"
        
        echo "Fetching AppImage from: $APPIMAGE_URL"
        
        # Get the actual download URL by following redirects
        ACTUAL_URL=$(curl -s -I "$APPIMAGE_URL" | grep -i location | cut -d' ' -f2 | tr -d '\r\n')
        
        if [[ -z "$ACTUAL_URL" ]]; then
          echo "Error: Could not get actual download URL"
          exit 1
        fi
        
        echo "Actual download URL: $ACTUAL_URL"
        
        # Get the SHA256 hash with retries
        for i in {1..3}; do
          echo "Attempt $i: Calculating SHA256 hash..."
          if SHA256=$(nix-prefetch-url --type sha256 "$ACTUAL_URL" 2>/dev/null); then
            if [[ "$SHA256" != "" && ${#SHA256} -eq 52 ]]; then
              echo "SHA256: $SHA256"
              break
            fi
          fi
          
          if [[ $i -eq 3 ]]; then
            echo "Error: Failed to calculate SHA256 after 3 attempts"
            exit 1
          fi
          
          echo "Retrying in 5 seconds..."
          sleep 5
        done
        
        # Create backup
        cp flake.nix flake.nix.backup
        
        # Update flake.nix with new version and hash - be more specific to avoid replacing nixpkgs URL
        sed -i "s/version = \"[^\"]*\"  # Will be updated by GitHub Actions/version = \"$VERSION\"/" flake.nix
        sed -i "/buildCursor = {/,/};/s|url = \"[^\"]*\"|url = \"$ACTUAL_URL\"|" flake.nix
        sed -i "/buildCursor = {/,/};/s/sha256 = \"[^\"]*\"/sha256 = \"$SHA256\"/" flake.nix
        
        echo "Updated flake.nix with version $VERSION"
    
    - name: Test the updated flake
      if: steps.check_update.outputs.update_needed == 'true'
      run: |
        nix flake check
        nix build .#cursor --dry-run
    
    - name: Commit and push changes
      if: steps.check_update.outputs.update_needed == 'true'
      run: |
        git config --local user.email "action@github.com"
        git config --local user.name "GitHub Action"
        git add flake.nix
        git commit -m "Update Cursor to version ${{ steps.get_version.outputs.version }}"
        git push
    
    - name: Create release
      if: steps.check_update.outputs.update_needed == 'true'
      uses: actions/create-release@v1
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      with:
        tag_name: "cursor-${{ steps.get_version.outputs.version }}"
        release_name: "Cursor ${{ steps.get_version.outputs.version }}"
        body: |
          Automated update to Cursor version ${{ steps.get_version.outputs.version }}
          
          Changes:
          - Updated version to ${{ steps.get_version.outputs.version }}
          - Updated download URL and SHA256 hash
          - Tested flake build
        draft: false
        prerelease: false