#!/bin/sh
# OpenLogi Linux install script.
#
# Installs the three OpenLogi binaries plus udev rules, the systemd user-unit
# template, the .desktop launcher, and the app icon. Requires sudo for the
# system-wide paths.
#
# Usage:
#   ./install.sh [--prefix PREFIX]   (default PREFIX=/usr/local)
#   ./install.sh --help
#
# On systemd systems the udev rules are reloaded automatically. The agent
# must be enabled per-user:
#   systemctl --user enable --now openlogi-agent.service

set -eu

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PREFIX=/usr/local
BINDIR=
PRINT_HELP=0

for arg in "$@"; do
    case "$arg" in
        --prefix=*) PREFIX="${arg#--prefix=}" ;;
        --prefix)   echo "--prefix requires a value, e.g. --prefix=/usr" >&2; exit 1 ;;
        --help|-h)  PRINT_HELP=1 ;;
        *) echo "Unknown argument: $arg" >&2; exit 1 ;;
    esac
done

if [ "$PRINT_HELP" -eq 1 ]; then
    cat <<EOF
Usage: $0 [--prefix PREFIX]

Options:
  --prefix PREFIX   Install binaries under PREFIX/bin (default: /usr/local)
  --help            Show this help

The script installs:
  PREFIX/bin/openlogi
  PREFIX/bin/openlogi-gui
  PREFIX/bin/openlogi-agent
  /etc/udev/rules.d/70-openlogi.rules
  /usr/lib/systemd/user/openlogi-agent.service  (if systemd is present)
  /usr/share/applications/openlogi.desktop
  /usr/share/icons/hicolor/512x512/apps/openlogi.png
EOF
    exit 0
fi

BINDIR="${PREFIX}/bin"

# ── locate build output ────────────────────────────────────────────────────────

# Prefer a release build next to the script (typical: run from the repo root
# after `cargo build --release`).
REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
BUILD_DIR="${REPO_ROOT}/target/release"

for bin in openlogi openlogi-gui openlogi-agent; do
    if [ ! -x "${BUILD_DIR}/${bin}" ]; then
        echo "Error: ${BUILD_DIR}/${bin} not found." >&2
        echo "Build first: cargo build --release" >&2
        exit 1
    fi
done

# ── install binaries ───────────────────────────────────────────────────────────

echo "Installing binaries to ${BINDIR} …"
sudo install -Dm755 "${BUILD_DIR}/openlogi"       "${BINDIR}/openlogi"
sudo install -Dm755 "${BUILD_DIR}/openlogi-gui"   "${BINDIR}/openlogi-gui"
sudo install -Dm755 "${BUILD_DIR}/openlogi-agent" "${BINDIR}/openlogi-agent"

# ── udev rules ────────────────────────────────────────────────────────────────

echo "Installing udev rules …"
sudo install -Dm644 "${SCRIPT_DIR}/udev/70-openlogi.rules" \
    /etc/udev/rules.d/70-openlogi.rules

if command -v udevadm > /dev/null 2>&1; then
    echo "Reloading udev rules …"
    sudo udevadm control --reload-rules
    sudo udevadm trigger --subsystem-match=hidraw
    sudo udevadm trigger --subsystem-match=input
    sudo udevadm trigger --subsystem-match=misc --attr-match=name=uinput 2>/dev/null || true
fi

# ── systemd user unit ─────────────────────────────────────────────────────────

SYSTEMD_UNIT_DIR=/usr/lib/systemd/user
if [ -d "$SYSTEMD_UNIT_DIR" ] || command -v systemctl > /dev/null 2>&1; then
    echo "Installing systemd user unit …"
    # Rewrite the packaged /usr/bin path to match the requested install prefix.
    # Escape the replacement so sed metacharacters (& \ |) in the path are literal.
    ESCAPED_BINDIR="$(printf '%s\n' "${BINDIR}" | sed 's|[&\\|]|\\&|g')"
    sed "s|^ExecStart=/usr/bin/openlogi-agent$|ExecStart=${ESCAPED_BINDIR}/openlogi-agent|" \
        "${SCRIPT_DIR}/systemd/openlogi-agent.service" \
        | sudo tee "${SYSTEMD_UNIT_DIR}/openlogi-agent.service" > /dev/null
    # Best-effort daemon-reload for the invoking user so a reinstall picks up
    # the updated unit without requiring a manual reload.
    INSTALL_USER="${SUDO_USER:-$USER}"
    sudo -u "$INSTALL_USER" \
        XDG_RUNTIME_DIR="/run/user/$(id -u "$INSTALL_USER")" \
        systemctl --user daemon-reload 2>/dev/null || true
    echo "Enable the agent for your user with:"
    echo "  systemctl --user enable --now openlogi-agent.service"
fi

# ── desktop entry ─────────────────────────────────────────────────────────────

echo "Installing desktop entry …"
sudo install -Dm644 "${SCRIPT_DIR}/desktop/openlogi.desktop" \
    /usr/share/applications/openlogi.desktop

# ── icon ──────────────────────────────────────────────────────────────────────

ICON_SRC="${REPO_ROOT}/design/icon/openlogi.png"
if [ -f "$ICON_SRC" ]; then
    echo "Installing icon …"
    sudo install -Dm644 "$ICON_SRC" \
        /usr/share/icons/hicolor/512x512/apps/openlogi.png
    if command -v gtk-update-icon-cache > /dev/null 2>&1; then
        sudo gtk-update-icon-cache -qtf /usr/share/icons/hicolor || true
    fi
fi

if command -v update-desktop-database > /dev/null 2>&1; then
    sudo update-desktop-database -q /usr/share/applications || true
fi

echo ""
echo "OpenLogi installed. Run 'openlogi-gui' to start, or enable the background"
echo "agent with: systemctl --user enable --now openlogi-agent.service"