name: Check Wallpapers Format

on:
  push:
    paths:
      - 'wallpapers/**'
  pull_request:
    paths:
      - 'wallpapers/**'

jobs:
  check-extensions:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Validate file format and naming conventions
        run: |
          # Loop through all wallpaper files
          cd "./wallpapers"
          for file in *; do
            if [[ -f "$file" ]]; then
              filename=$file
              basename=$(echo "$file" | cut -d. -f1)

              # Check if .png, .jpg or .gif
              if [[ ! $filename =~ \.(png|jpg|gif)$ ]]; then
                echo "❌ Error: $file is not a PNG, JPG or GIF file"
                exit 1
              fi

              # Check if only lowercase letters, - and _ are used
              echo "$basename" | grep -qE '^[a-z0-9][a-z0-9_-]*$' || {
                echo "❌ Error: $file contains invalid characters"
                exit 1
              }

              if [[ $basename == *-_* ]]; then
                echo "❌ Error: $file contains a tag with a leading or trailing _"
                exit 1
              fi

              if [[ $basename == *"_static"* ]]; then
                if [ ! -f "${basename}*.gif" ]; then
                  echo "❌ Error: $file has a static tag but no gif file"
                  exit 1
                fi
              fi

              # If le fichier contient _animated, il doit y avoir un fichier png ou jpg qui contient le même nom et _static à la place de _animated
              if [[ $basename == *"_animated"* ]]; then
                t=$(echo "$basename" | sed 's/animated/static/')
                if [ ! -f "${t}.png" ] && [ ! -f "${t}.jpg" ]; then
                  echo "❌ Error: $file has a animated tag but no png or jpg file"
                  exit 1
                fi
              fi

              if [[ $filename == *.gif && $basename != *"_animated"* ]]; then
                echo "❌ Error: $file is a gif file but doesn't contain _static or _animated"
                exit 1
              fi
            fi
          done