#!/bin/sh
# AskDavis Battlefield 2 on Linux.
#   curl -fsSL https://bf2.askdavis.com/linux.sh | sh
# Installs Lutris if you have none, then runs our Lutris install script, which
# sets up Wine and asks for the setup .exe you downloaded from https://bf2.askdavis.com/downloads.

main() {
	set -eu

	YML_URL="https://bf2.askdavis.com/linux/askdavis-bf2.yml"
	DIR="${XDG_CACHE_HOME:-$HOME/.cache}/askdavis-bf2"
	YML="$DIR/askdavis-bf2.yml"

	if [ "$(id -u)" -eq 0 ]; then
		fail "Run this as your normal user, not as root (no sudo in front)."
	fi

	say "Getting the AskDavis install script"
	mkdir -p "$DIR"
	curl -fsSL "$YML_URL" -o "$YML" || fail "Could not download $YML_URL"

	if have lutris; then
		say "Lutris is installed"
		run_native
	elif have flatpak && flatpak info net.lutris.Lutris >/dev/null 2>&1; then
		say "Lutris (Flatpak) is installed"
		run_flatpak
	elif have pacman; then
		say "Installing Lutris with pacman (asks for your password)"
		sudo pacman -S --needed lutris </dev/tty
		run_native
	elif have dnf; then
		say "Installing Lutris with dnf (asks for your password)"
		sudo dnf install -y lutris </dev/tty
		run_native
	elif have flatpak; then
		say "Installing Lutris from Flathub"
		flatpak remote-add --user --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
		flatpak install --user -y flathub net.lutris.Lutris </dev/tty
		run_flatpak
	elif have apt-get; then
		say "Installing Lutris with apt (asks for your password)"
		sudo apt-get install -y lutris </dev/tty
		run_native
	else
		fail "Could not install Lutris on this system. Install it from https://lutris.net, then run this again."
	fi
}

run_native() {
	say "Downloading Lutris's components (DXVK, winetricks)"
	python3 -c "$COMPONENTS" </dev/null ||
		say "Could not download them now; if the install stops on a missing component, open Lutris once and run this again."
	say "Opening Lutris. When it asks, pick the setup you downloaded."
	lutris -i "$YML" </dev/null
	done_msg
}

run_flatpak() {
	say "Downloading Lutris's components (DXVK, winetricks)"
	flatpak run --command=python3 net.lutris.Lutris -c "$COMPONENTS" </dev/null ||
		say "Could not download them now; if the install stops on a missing component, open Lutris once and run this again."
	say "Opening Lutris. When it asks, pick the setup you downloaded."
	# --file-forwarding hands the sandboxed app a path it is allowed to read.
	flatpak run --file-forwarding net.lutris.Lutris -i @@ "$YML" @@ </dev/null
	done_msg
}

done_msg() {
	say "Done. Start \"AskDavis Battlefield 2\" from Lutris."
}

# Lutris's runtime components (DXVK, winetricks, ...). Lutris downloads them when
# its main window opens; `lutris -i` never opens it, so on a fresh Lutris the
# install stops with "The 'DXVK' runtime component is not installed". This is
# the same download, done first. GTK 3 is pinned as Lutris itself does.
COMPONENTS='
import gi
gi.require_version("Gtk", "3.0")
gi.require_version("Gdk", "3.0")
from lutris.runtime import RuntimeUpdater
u = RuntimeUpdater(force=True)
parts = u.create_component_updaters()
for p in parts: p.install_update(u)
for p in parts: p.join()
'

have() { command -v "$1" >/dev/null 2>&1; }
say() { printf '\n==> %s\n' "$*"; }
fail() { printf '\n!! %s\n' "$*" >&2; exit 1; }

main "$@"