#!/usr/bin/env sh
set -eu

usage() {
    cat <<EOF
Usage: ./install.sh [install|uninstall] [options]

Commands:
  install             Build and install wayviewer
  uninstall           Remove files installed by this script

Options:
  --prefix PATH       Install prefix, default: \$HOME/.local
  --system            Install to /usr/local
  --debug             Build Debug instead of Release
  --build-dir PATH    Build directory, default: build or build-debug
  --destdir PATH      Stage install or uninstall under DESTDIR
  --help              Show this help
EOF
}

script_dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
action=install
build_type=Release
prefix=${WAYVIEWER_PREFIX:-"$HOME/.local"}
build_dir=
destdir=

while [ "$#" -gt 0 ]; do
    case "$1" in
        install)
            action=install
            ;;
        uninstall|remove)
            action=uninstall
            ;;
        --prefix)
            shift
            [ "$#" -gt 0 ] || { echo "install.sh: missing value for --prefix" >&2; exit 2; }
            prefix=$1
            ;;
        --system)
            prefix=/usr/local
            ;;
        --debug)
            build_type=Debug
            ;;
        --build-dir)
            shift
            [ "$#" -gt 0 ] || { echo "install.sh: missing value for --build-dir" >&2; exit 2; }
            build_dir=$1
            ;;
        --destdir)
            shift
            [ "$#" -gt 0 ] || { echo "install.sh: missing value for --destdir" >&2; exit 2; }
            destdir=$1
            ;;
        --help|-h)
            usage
            exit 0
            ;;
        *)
            echo "install.sh: unknown option: $1" >&2
            usage >&2
            exit 2
            ;;
    esac
    shift
done

if [ -z "$build_dir" ]; then
    if [ "$build_type" = Debug ]; then
        build_dir=$script_dir/build-debug
    else
        build_dir=$script_dir/build
    fi
fi

run_install() {
    command -v cmake >/dev/null 2>&1 || { echo "install.sh: cmake is required" >&2; exit 1; }
    command -v pkg-config >/dev/null 2>&1 || { echo "install.sh: pkg-config is required" >&2; exit 1; }

    cmake -S "$script_dir" -B "$build_dir" \
        -DCMAKE_BUILD_TYPE="$build_type" \
        -DCMAKE_INSTALL_PREFIX="$prefix" \
        -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
    cmake --build "$build_dir"

    if [ -n "$destdir" ]; then
        DESTDIR=$destdir cmake --install "$build_dir"
    elif mkdir -p "$prefix" 2>/dev/null && [ -w "$prefix" ]; then
        cmake --install "$build_dir"
    elif command -v sudo >/dev/null 2>&1; then
        sudo cmake --install "$build_dir"
    else
        echo "install.sh: $prefix is not writable and sudo was not found" >&2
        exit 1
    fi

    if command -v update-desktop-database >/dev/null 2>&1; then
        applications_dir=${destdir}${prefix}/share/applications
        if [ -d "$applications_dir" ]; then
            update-desktop-database "$applications_dir" >/dev/null 2>&1 || true
        fi
    fi
}

run_uninstall() {
    manifest=$build_dir/install_manifest.txt
    if [ ! -f "$manifest" ]; then
        echo "install.sh: no install manifest found at $manifest" >&2
        echo "install.sh: run install first or pass the matching --build-dir" >&2
        exit 1
    fi

    while IFS= read -r path || [ -n "$path" ]; do
        target=${destdir}${path}
        if [ -e "$target" ] || [ -L "$target" ]; then
            if [ -w "$(dirname "$target")" ]; then
                rm -f "$target"
            elif command -v sudo >/dev/null 2>&1; then
                sudo rm -f "$target"
            else
                echo "install.sh: cannot remove $target and sudo was not found" >&2
                exit 1
            fi
            echo "Removed $target"
        fi
    done < "$manifest"

    if command -v update-desktop-database >/dev/null 2>&1; then
        applications_dir=${destdir}${prefix}/share/applications
        if [ -d "$applications_dir" ]; then
            update-desktop-database "$applications_dir" >/dev/null 2>&1 || true
        fi
    fi
}

case "$action" in
    install)
        run_install
        ;;
    uninstall)
        run_uninstall
        ;;
esac