#!/usr/bin/env bash
readonly dependency=("username/base16-package")
readonly app="qutebrowser"

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/$package/themes/default/base16-$theme.config.py"

  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"
  # saveroo
  dbg_msg $app "Sucessfully Saved theme"
}

## 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"
  # includeroo
  dbg_msg $app "Sucessfully included theme"
}

## 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$"; then
  # Safe sourcing: https://stackoverflow.com/a/12694189
  DIR="${BASH_SOURCE%/*}"
  if [[ ! -d "$DIR" ]]; then DIR="$PWD"; fi
  # shellcheck source=utilities.sh
  . "$DIR/utilities.sh"

  theme_qutebrowser
else
  dbg_msg $app "error" "Processor does not work for package $package"
fi