#!/usr/bin/env bash

set -euo pipefail

# "Automate" flipping applications between light and dark themes.

DOTFILES="$(cd "$(dirname "$(dirname "$(realpath "${BASH_SOURCE[0]}")")")" && pwd)"
SCHEME_FILE="${DOTFILES}/.color-scheme"
OSTYPE="$(uname -s)"

install_dark() {
    ln -sf "${DOTFILES}/alacritty/colors-dark.toml"      "${DOTFILES}/alacritty/colors.toml"
    ln -sf "${DOTFILES}/bat/config-dark"                 "${DOTFILES}/bat/config"
    ln -sf "${DOTFILES}/task/jdkaplan-dark.theme"        "${DOTFILES}/task/color.theme"
    ln -sf "${DOTFILES}/vim/colors/jdkaplan-dark.vim"    "${DOTFILES}/vim/colors/jdkaplan.vim"
    ln -sf "${DOTFILES}/neovim/colors/jdkaplan-cool.lua" "${DOTFILES}/neovim/colors/jdkaplan-temp.lua"

    cat "${DOTFILES}/helix/dark.toml" "${DOTFILES}/helix/main.toml" > "${DOTFILES}/helix/config.toml"

    if [ "${OSTYPE}" == 'Linux' ]; then
        ln -sf "${DOTFILES}/xsettingsd/xsettingsd-dark.conf" "${DOTFILES}/xsettingsd/xsettingsd.conf"
    fi

    if [ "${XDG_SESSION_TYPE-}" == 'wayland' ]; then
        gsettings set org.gnome.desktop.interface gtk-theme 'Adwaita-dark'
        gsettings set org.gnome.desktop.interface icon-theme 'Adwaita-dark'
        gsettings set org.gnome.desktop.interface color-scheme 'prefer-dark'
    fi
}

install_light() {
    ln -sf "${DOTFILES}/alacritty/colors-light.toml"     "${DOTFILES}/alacritty/colors.toml"
    ln -sf "${DOTFILES}/bat/config-light"                "${DOTFILES}/bat/config"
    ln -sf "${DOTFILES}/task/jdkaplan-light.theme"       "${DOTFILES}/task/color.theme"
    ln -sf "${DOTFILES}/vim/colors/jdkaplan-light.vim"   "${DOTFILES}/vim/colors/jdkaplan.vim"
    ln -sf "${DOTFILES}/neovim/colors/jdkaplan-warm.lua" "${DOTFILES}/neovim/colors/jdkaplan-temp.lua"

    cat "${DOTFILES}/helix/light.toml" "${DOTFILES}/helix/main.toml" > "${DOTFILES}/helix/config.toml"

    if [ "${OSTYPE}" == 'Linux' ]; then
        ln -sf "${DOTFILES}/xsettingsd/xsettingsd-light.conf" "${DOTFILES}/xsettingsd/xsettingsd.conf"
    fi

    if [ "${XDG_SESSION_TYPE-}" == 'wayland' ]; then
        gsettings set org.gnome.desktop.interface gtk-theme 'Adwaita'
        gsettings set org.gnome.desktop.interface icon-theme 'Adwaita'
        gsettings set org.gnome.desktop.interface color-scheme 'prefer-light'
    fi
}

postinstall() {
    # Alacritty doesn't automatically reload config when the symlink to
    # `colors.toml` is replaced with the new target. So touch the main config
    # to trigger the reload.
    touch "${DOTFILES}/alacritty/alacritty.toml"

    if [ "${OSTYPE}" == 'Linux' ]; then
        killall --signal HUP xsettingsd
    fi
}

if [ -f "${SCHEME_FILE}" ]; then
    default_scheme="$(head -n 1 "${SCHEME_FILE}")"
else
    default_scheme='dark'
fi

scheme="${1:-${default_scheme}}"

if [ "${scheme}" = 'dark' ]; then
    install_dark
elif [ "${scheme}" = 'light' ]; then
    install_light
else
    echo "Unknown color scheme: ${scheme}"
    exit 1
fi

postinstall

echo "$scheme" > "${SCHEME_FILE}"