#!/usr/bin/env bash
# /* ---- 💫 https://github.com/JaKooLit 💫 ---- */  #
# Rofi Themes - Script to preview and apply themes by live-reloading the config.

# --- Configuration ---
ROFI_THEMES_DIR_CONFIG="$HOME/.config/rofi/themes"
ROFI_THEMES_DIR_LOCAL="$HOME/.local/share/rofi/themes"
ROFI_CONFIG_FILE="$HOME/.config/rofi/config.rasi"
ROFI_THEME_FOR_THIS_SCRIPT="$HOME/.config/rofi/config-rofi-theme.rasi" # A separate rofi theme for the picker itself
IDIR="$HOME/.config/swaync/images"                                     # For notifications

# --- Helper Functions ---

# Function to send a notification
notify_user() {
  notify-send -u low -i "$1" "$2" "$3"
}

# Function to apply the selected rofi theme to the main config file
apply_rofi_theme_to_config() {
  local theme_name_to_apply="$1"

  # Find the full path of the theme file
  local theme_path
  if [[ -f "$ROFI_THEMES_DIR_CONFIG/$theme_name_to_apply" ]]; then
    theme_path="$ROFI_THEMES_DIR_CONFIG/$theme_name_to_apply"
  elif [[ -f "$ROFI_THEMES_DIR_LOCAL/$theme_name_to_apply" ]]; then
    theme_path="$ROFI_THEMES_DIR_LOCAL/$theme_name_to_apply"
  else
    notify_user "$IDIR/error.png" "Error" "Theme file not found: $theme_name_to_apply"
    return 1
  fi

  # Use ~ for the home directory in the config path
  local theme_path_with_tilde="~${theme_path#$HOME}"

  # Create a temporary file to safely edit the config
  local temp_rofi_config_file
  temp_rofi_config_file=$(mktemp)
  cp "$ROFI_CONFIG_FILE" "$temp_rofi_config_file"

  # Comment out any existing @theme entry
  sed -i -E 's/^(\s*@theme)/\\/\\/\1/' "$temp_rofi_config_file"

  # Add the new @theme entry at the end of the file
  echo "@theme \"$theme_path_with_tilde\"" >>"$temp_rofi_config_file"

  # Overwrite the original config file
  cp "$temp_rofi_config_file" "$ROFI_CONFIG_FILE"
  rm "$temp_rofi_config_file"

  # Prune old commented-out theme lines to prevent clutter
  local max_lines=10
  local total_lines=$(grep -c '^//\s*@theme' "$ROFI_CONFIG_FILE")
  if [ "$total_lines" -gt "$max_lines" ]; then
    local excess=$((total_lines - max_lines))
    for ((i = 1; i <= excess; i++)); do
      sed -i '0,/^\s*\/\/@theme/s///' "$ROFI_CONFIG_FILE"
    done
  fi

  return 0
}

# --- Main Script Execution ---

# Check for required directories and files
if [ ! -d "$ROFI_THEMES_DIR_CONFIG" ] && [ ! -d "$ROFI_THEMES_DIR_LOCAL" ]; then
  notify_user "$IDIR/error.png" "E-R-R-O-R" "No Rofi themes directory found."
  exit 1
fi

if [ ! -f "$ROFI_CONFIG_FILE" ]; then
  notify_user "$IDIR/error.png" "E-R-R-O-R" "Rofi config file not found: $ROFI_CONFIG_FILE"
  exit 1
fi

# Backup the original config content
original_rofi_config_content_backup=$(cat "$ROFI_CONFIG_FILE")

# Generate a sorted list of available theme file names
mapfile -t available_theme_names < <((
  find "$ROFI_THEMES_DIR_CONFIG" -maxdepth 1 -name "*.rasi" -type f -printf "%f\n" 2>/dev/null
  find "$ROFI_THEMES_DIR_LOCAL" -maxdepth 1 -name "*.rasi" -type f -printf "%f\n" 2>/dev/null
) | sort -V -u)

if [ ${#available_theme_names[@]} -eq 0 ]; then
  notify_user "$IDIR/error.png" "No Rofi Themes" "No .rasi files found in theme directories."
  exit 1
fi

# Find the currently active theme to set as the initial selection
current_selection_index=0
current_active_theme_path=$(grep -oP '^\s*@theme\s*"\K[^"]+' "$ROFI_CONFIG_FILE" | tail -n 1)
if [ -n "$current_active_theme_path" ]; then
  current_active_theme_name=$(basename "$current_active_theme_path")
  for i in "${!available_theme_names[@]}"; do
    if [[ "${available_theme_names[$i]}" == "$current_active_theme_name" ]]; then
      current_selection_index=$i
      break
    fi
  done
fi

# Main preview loop
while true; do
  theme_to_preview_now="${available_theme_names[$current_selection_index]}"

  # Apply the theme for preview
  if ! apply_rofi_theme_to_config "$theme_to_preview_now"; then
    echo "$original_rofi_config_content_backup" >"$ROFI_CONFIG_FILE"
    notify_user "$IDIR/error.png" "Preview Error" "Failed to apply $theme_to_preview_now. Reverted."
    exit 1
  fi

  # Prepare theme list for Rofi
  rofi_input_list=""
  for theme_name_in_list in "${available_theme_names[@]}"; do
    rofi_input_list+="$(basename "$theme_name_in_list" .rasi)\n"
  done
  rofi_input_list_trimmed="${rofi_input_list%\\n}"

  # Launch Rofi and get user's choice
  chosen_index_from_rofi=$(echo -e "$rofi_input_list_trimmed" |
    rofi -dmenu -i \
      -format 'i' \
      -p "Rofi Theme" \
      -mesg "‼️ **note** ‼️ Enter: Preview || Ctrl+S: Apply &amp; Exit || Esc: Cancel" \
      -config "$ROFI_THEME_FOR_THIS_SCRIPT" \
      -selected-row "$current_selection_index" \
      -kb-custom-1 "Control+s")

  rofi_exit_code=$?

  # Handle Rofi's exit code
  if [ $rofi_exit_code -eq 0 ]; then # Enter
    if [[ "$chosen_index_from_rofi" =~ ^[0-9]+$ ]] && [ "$chosen_index_from_rofi" -lt "${#available_theme_names[@]}" ]; then
      current_selection_index="$chosen_index_from_rofi"
    fi
  elif [ $rofi_exit_code -eq 1 ]; then # Escape
    notify_user "$IDIR/note.png" "Rofi Theme" "Selection cancelled. Reverting to original theme."
    echo "$original_rofi_config_content_backup" >"$ROFI_CONFIG_FILE"
    break
  elif [ $rofi_exit_code -eq 10 ]; then # Custom bind 1 (Ctrl+S)
    notify_user "$IDIR/ja.png" "Rofi Theme Applied" "$(basename "$theme_to_preview_now" .rasi)"
    break
  else # Error or unexpected exit code
    notify_user "$IDIR/error.png" "Rofi Error" "Unexpected Rofi exit ($rofi_exit_code). Reverting."
    echo "$original_rofi_config_content_backup" >"$ROFI_CONFIG_FILE"
    break
  fi
done

exit 0