#!/bin/bash

# omarchy:summary=Open a generic image selector menu
# omarchy:args=[--selected <image>] [--colors-file <path>] [--print-name] <image-dir>...

OMARCHY_PATH=${OMARCHY_PATH:-$HOME/.local/share/omarchy}

selected_image=""
colors_file=""
print_name=false
image_dirs=()

while [[ $# -gt 0 ]]; do
  case "$1" in
    --selected)
      selected_image="$2"
      shift 2
      ;;
    --colors-file)
      colors_file="$2"
      shift 2
      ;;
    --print-name)
      print_name=true
      shift
      ;;
    --help|-h)
      echo "Usage: omarchy-menu-images [--selected <image>] [--colors-file <path>] [--print-name] <image-dir>..."
      exit 0
      ;;
    *)
      image_dirs+=("$1")
      shift
      ;;
  esac
done

if (( ${#image_dirs[@]} == 0 )); then
  echo "Usage: omarchy-menu-images [--selected <image>] [--colors-file <path>] [--print-name] <image-dir>..." >&2
  exit 1
fi

selection_file=$(mktemp)
done_file=$(mktemp)
rm -f "$done_file"
trap 'rm -f "$selection_file" "$done_file"' EXIT
socket_path="${XDG_RUNTIME_DIR:-/run/user/$UID}/omarchy-image-selector.sock"
selector_qml="$OMARCHY_PATH/default/quickshell/wallpaper-switcher.qml"

image_dirs_env=""
for dir in "${image_dirs[@]}"; do
  if [[ -z $image_dirs_env ]]; then
    image_dirs_env="$dir"
  else
    image_dirs_env+=$'\n'"$dir"
  fi
done

current_image=$(readlink -f "$selected_image" 2>/dev/null)
selected_list_image=""

if [[ -n $current_image ]]; then
  for dir in "${image_dirs[@]}"; do
    if [[ -d $dir && -f $selected_image && ${selected_image%/*} == "$dir" ]]; then
      selected_list_image="$selected_image"
      break
    elif [[ -d $dir ]]; then
      selected_list_image=$(find -L "$dir" -maxdepth 1 -type f -samefile "$current_image" -print -quit 2>/dev/null)
      [[ -n $selected_list_image ]] && break
    fi
  done
fi

cache_dir=${XDG_CACHE_HOME:-$HOME/.cache}/omarchy/image-selector
index_file="$cache_dir/index.tsv"
rows=""
mkdir -p "$cache_dir"

cache_key=$(printf '%s' "$image_dirs_env" | md5sum | cut -d ' ' -f 1)
rows_cache_file="$cache_dir/$cache_key.rows"
rows_signature_file="$cache_dir/$cache_key.signature"
rows_signature=""

for dir in "${image_dirs[@]}"; do
  if [[ -d $dir ]]; then
    rows_signature+="$dir:$(stat -Lc '%Y' "$dir")"$'\n'
  fi
done

thumbnail_for() {
  local image="$1"
  local signature hash thumbnail

  signature=$(stat -Lc '%s:%Y' "$image") || return
  hash=$(awk -F '\t' -v path="$image" -v sig="$signature" '$1 == path && $2 == sig { print $3; exit }' "$index_file" 2>/dev/null)

  if [[ -z $hash ]]; then
    hash=$(md5sum "$image" | cut -d ' ' -f 1)
    printf '%s\t%s\t%s\n' "$image" "$signature" "$hash" >>"$index_file"
  fi

  thumbnail="$cache_dir/$hash.jpg"

  if [[ ! -f $thumbnail ]]; then
    magick "$image" -auto-orient -resize '1536x864^' -gravity center -extent '1536x864' -strip -quality 82 "$thumbnail"
  fi

  printf '%s' "$thumbnail"
}

if [[ -f $rows_cache_file && -f $rows_signature_file ]] && cmp -s "$rows_signature_file" <(printf '%s' "$rows_signature"); then
  rows=$(<"$rows_cache_file")
else
  for dir in "${image_dirs[@]}"; do
    if [[ -d $dir ]]; then
      while IFS= read -r -d '' image; do
        thumbnail=$(thumbnail_for "$image")
        [[ -n $thumbnail ]] || continue

        if [[ -z $rows ]]; then
          rows="$image"$'\t'"$thumbnail"
        else
          rows+=$'\n'"$image"$'\t'"$thumbnail"
        fi
      done < <(find -L "$dir" -maxdepth 1 -type f \( -iname '*.jpg' -o -iname '*.jpeg' -o -iname '*.png' -o -iname '*.webp' \) -print0 2>/dev/null)
    fi
  done

  printf '%s' "$rows" >"$rows_cache_file"
  printf '%s' "$rows_signature" >"$rows_signature_file"
fi

rows_payload=${rows//$'\t'/$'\f'}
rows_payload=${rows_payload//$'\n'/$'\v'}

if [[ -S $socket_path && $selector_qml -nt $socket_path ]]; then
  quickshell kill -p "$selector_qml" >/dev/null 2>&1 || true
  rm -f "$socket_path"
fi

if [[ ! -S $socket_path ]]; then
  quickshell kill -p "$selector_qml" >/dev/null 2>&1 || true
  quickshell -d -p "$selector_qml" >/dev/null

  for ((i = 0; i < 100; i++)); do
    if [[ -S $socket_path ]]; then
      break
    fi

    sleep 0.01
  done
fi

if [[ ! -S $socket_path ]]; then
  echo "Image selector failed to start" >&2
  exit 1
fi

printf '%s\t%s\t%s\t%s\t%s\n' "$rows_payload" "$selected_list_image" "$selection_file" "$done_file" "$colors_file" |
  socat -u - "UNIX-CONNECT:$socket_path"

while [[ ! -e $done_file ]]; do
  sleep 0.01
done

if [[ -s $selection_file ]]; then
  if [[ $print_name == true ]]; then
    selection=$(<"$selection_file")
    selection=${selection##*/}
    printf '%s\n' "${selection%.*}"
  else
    cat "$selection_file"
  fi
fi