#!/usr/bin/env bash
readonly dependency=("nicodebo/base16-zathura")
readonly app="zathura"
#
# zathura now allows including other files into its
# main configuration file. That means we can be less
# intrusive about the colorscheme changes and only insert
# the include line, adding any colorscheme options
# in a completely different file.
#
# In general, the processor looks for a specific line in the
# following format:
# '# Base16 [theme name] - zathura color config'
# from which it will delete everything until it finds a line:
# '# Base16End [theme name] - zathura 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"

zathura_conf_dir="$HOME/.config/zathura"
zathuraconf="$zathura_conf_dir/zathurarc"
colorscheme_filename="colorscheme"

## 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/$package/build_schemes/base16-$theme.config"

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

    if [ ! -f "$zathuraconf" ]; then
        dbg_msg $app "error" "Zathura config file not found. Please make sure file exists: $zathuraconf"
    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 ! $(grep -qe "^include $colorscheme_filename" "$zathuraconf"); then
        dbg_msg $app "No include directive for colorscheme file found in configuration file. Adding it now."
        printf "\ninclude %s\n" "$colorscheme_filename" >>"$zathuraconf"
    else
        dbg_msg $app "Found include directive for colorscheme file. No operation necessary."
    fi

    cat "$tfile" >"${zathura_conf_dir}/${colorscheme_filename}" || exit 1

    dbg_msg $app "Saved theme to ${zathura_conf_dir}/${colorscheme_filename}"
}

# 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