name: Generate Directory READMEs

on:
  push:
    branches: [main, master]
    paths:
      - "Found/**"
      - "Made/**"
  workflow_dispatch:

permissions:
  contents: write

jobs:
  generate-readmes:
    runs-on: local
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Generate READMEs
        run: |
          #!/bin/bash
          set -euo pipefail
          IMAGE_EXTS=("jpg" "jpeg" "png" "gif" "webp" "bmp" "svg")
          count_images() {
            local dir="$1" count=0
            for ext in "${IMAGE_EXTS[@]}"; do
              local n
              n=$(find "$dir" -maxdepth 1 -type f -iname "*.${ext}" 2>/dev/null | wc -l)
              count=$((count + n))
            done
            echo "$count"
          }
          get_images() {
            local dir="$1"
            for ext in "${IMAGE_EXTS[@]}"; do
              find "$dir" -maxdepth 1 -type f -iname "*.${ext}" 2>/dev/null
            done | sort
          }
          get_subdirs() {
            find "$1" -maxdepth 1 -mindepth 1 -type d 2>/dev/null | sort
          }
          generate_readme() {
            local dir="$1" readme="${1}/README.md"
            local dir_name rel_path
            dir_name=$(basename "$dir")
            rel_path="${dir#./}"
            [ "$rel_path" = "." ] && return
            local content=""
            content+="# ${dir_name}\n\n"
            local parent parent_name
            parent=$(dirname "$dir")
            parent_name=$(basename "$parent")
            if [ "$parent" != "." ]; then
              content+="[\u2b05\ufe0f Back to ${parent_name}](../README.md)\n\n"
            fi
            local subdirs
            subdirs=$(get_subdirs "$dir")
            if [ -n "$subdirs" ]; then
              content+="## Folders\n\n"
              while IFS= read -r subdir; do
                local sub_name sub_count
                sub_name=$(basename "$subdir")
                sub_count=$(count_images "$subdir")
                content+="- [\ud83d\udcc2 ${sub_name}](./${sub_name}/) (${sub_count} images)\n"
              done <<< "$subdirs"
              content+="\n"
            fi
            local images
            images=$(get_images "$dir")
            if [ -n "$images" ]; then
              local img_count
              img_count=$(echo "$images" | wc -l)
              content+="## Images (${img_count})\n\n"
              content+="| | | |\n|---|---|---|\n"
              local col=0
              while IFS= read -r img; do
                local img_name
                img_name=$(basename "$img")
                [ $col -eq 0 ] && content+="| "
                content+="[![${img_name}](./${img_name})](./${img_name}) "
                col=$((col + 1))
                if [ $col -eq 3 ]; then
                  content+="|\n"
                  col=0
                fi
              done <<< "$images"
              if [ $col -ne 0 ]; then
                while [ $col -lt 3 ]; do
                  content+="| "
                  col=$((col + 1))
                done
                content+="|\n"
              fi
              content+="\n"
            fi
            echo -e "$content" > "$readme"
            echo "Generated: ${readme}"
          }
          for base_dir in Found Made; do
            if [ -d "$base_dir" ]; then
              generate_readme "./${base_dir}"
              while IFS= read -r dir; do
                generate_readme "$dir"
              done < <(find "./${base_dir}" -type d | sort)
            fi
          done

      - name: Commit and push changes
        run: |
          git config user.name "ACTIONEER[BOT]"
          git config user.email "actioneer@users.noreply.git.krzak.org"
          if git diff --quiet -- '*.md'; then
            echo "No changes to commit"
            exit 0
          fi
          git add '**/README.md'
          git commit -m "generate READMEs"
          git push