#!/usr/bin/env bash
readonly dependency=("khamer/base16-dunst")
readonly app="dunst"
#
# This configuration requires dunst version at least 1.8.0!
#
# Dunst now allows drop-in configuration files in a special
# `dunstrc.d/` directory in the usual configuration directory.
# That means we can drop in a specific `00-colorscheme.conf`
# file instead of operating directly on the main dunst
# configuration file.
#
# This will generally not be a problem, though it can lead
# to corrupted configurations in exceptional circumstances
# (such as every line being preceded by the process control
# regex, for whatever reason).
#
# In general, the processor looks for a specific line in the
# following format:
# '# Base16 [theme name] - dunst color config'
# from which it will delete everything until it finds a line:
# '# Base16End [theme name] - dunst color config'
# So, if you don't want to lose anything -
# Do NOT put anything important between those two lines.

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

dunst_conf_dir="$HOME/.config/dunst/dunstrc.d"
dunst_conf="$dunst_conf_dir/00-colorscheme.conf"

## 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.dunstrc"

    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

    dbg_msg $app "Processor Done"
}

## Theme setter
#
#  Takes care of permanently writing the desired
#  base16 theme into application settings.
save() {
    dbg_msg $app "Saving theme"

    if [ ! -f "$dunst_conf" ]; then
        mkdir -p "$dunst_conf_dir"
        dbg_msg $app "$app colorscheme file not found. Creating new colorscheme file: $dunst_conf"
    fi

    # fix template theme name key for easier inclusion
    echo "# Base16 $theme - dunst color config" >"$dunst_conf"
    cat "$tfile" >>"$dunst_conf" || exit 1
    echo "# Base16End $theme - dunst color config" >>"$dunst_conf"

    dbg_msg $app "Saved theme to $dunst_conf"

    save_post
}

save_post() {
    pkill dunst
    dunst &
}

# 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