#!/usr/bin/env bash
readonly dependency=("0xdec/base16-rofi")
readonly app="rofi"

path="$1"
package="$2"
theme="$3"
permanent="$4"

## Main Entrypoint
#
#  Finds the right theme template file and starts theme
#  switching and, if necessary, permanent setting processes.
main() {
  dbg_msg $app "Starting Processor"
  tfile="$path/$package/themes/base16-$theme.rasi"

  if ! file_exists "$tfile"; then
    dbg_msg $app "error" "Theme template $theme not found in package $package"
    exit 1
  fi

  if [[ "$permanent" == "true" ]]; then save; fi
  # theme

  dbg_msg $app "Processor Done"
}

### Theme switcher
##
##  Makes sure that if any application instance is
##  currently running, it switches to new theme.
#theme() {
#  dbg_msg $app "Switching theme"
#  # switcheroo
#  dbg_msg $app "Successfully switched theme"
#}

## Theme setter
#
#  Takes care of permanently writing the desired
#  base16 theme into application settings.
save() {
  dbg_msg $app "Saving theme"
  local rofi_dir="${XDG_CONFIG_HOME:-/$HOME/.config}/rofi/themes"

  if [[ -d "$rofi_dir" ]]; then
    cat "$tfile" >"$rofi_dir/colorscheme.rasi"
    dbg_msg $app "Saved theme to $rofi_dir/colorscheme.py"

    include "$rofi_dir"
  else
    dbg_msg $app "warn" "No configuration directory found"
  fi
}

## Theme includer
#
#  Makes sure that theme is actually included in
#  default application startup routine.
#  This is the most invasive step of theming since it
#  rewrites within existing configuration files.
include() {
  dbg_msg $app "Including theme in configuration"
  local rofi_dir="$1"

  if file_exists "$rofi_dir/settings.rasi"; then
    line_exists_or_append "$rofi_dir/settings.rasi" '@import "colorscheme.rasi"'
    dbg_msg $app "Successfully included theme in configuration"
  else
    dbg_msg $app "warn" "No default configuration file found"
  fi
  dbg_msg $app "Sucessfully included theme"
}

# Safe sourcing: https://stackoverflow.com/a/12694189
DIR="${BASH_SOURCE%/*}"
if [[ ! -d "$DIR" ]]; then DIR="$PWD"; fi
# shellcheck source=utilities.sh
. "$DIR/utilities.sh"
## Dependency Checker
#
#  Makes sure the processor is called for the correct
#  base16 package, or refuses to run if it is not.
if printf '%s\n' "${dependency[@]}" | grep -q -P "^$package$"; then
  main
else
  dbg_msg $app "error" "Processor does not work for package $package"
fi