#!/usr/bin/env bash
#
# scaffold-subdir - Create a new xo library subdirectory
#
# Usage: scaffold-headeronly [--mode=headeronly|shared] <name>
#   where <name> is the short name (e.g., "arena" creates "xo-arena")
#

set -euo pipefail

usage() {
    echo "Usage: $0 [--mode=headeronly|shared] <name>"
    echo "  Creates xo-<name>/ with library scaffolding"
    echo ""
    echo "Options:"
    echo "  --mode=headeronly  Create header-only library (default)"
    echo "  --mode=shared      Create shared library with src/ directory"
    echo ""
    echo "Example: $0 arena"
    echo "  Creates xo-arena/CMakeLists.txt"
    echo "          xo-arena/cmake/xo-bootstrap-macros.cmake"
    echo "          xo-arena/cmake/xo_arenaConfig.cmake.in"
    echo "          xo-arena/include/xo/arena/"
    echo ""
    echo "Example: $0 --mode=shared mylib"
    echo "  Creates xo-mylib/CMakeLists.txt"
    echo "          xo-mylib/cmake/xo-bootstrap-macros.cmake"
    echo "          xo-mylib/cmake/xo_mylibConfig.cmake.in"
    echo "          xo-mylib/include/xo/mylib/"
    echo "          xo-mylib/src/CMakeLists.txt"
    exit 1
}

# Default mode
MODE="headeronly"

# Parse arguments
while [[ $# -gt 0 ]]; do
    case "$1" in
        --mode=*)
            MODE="${1#--mode=}"
            if [[ "$MODE" != "headeronly" && "$MODE" != "shared" ]]; then
                echo "Error: --mode must be 'headeronly' or 'shared'"
                exit 1
            fi
            shift
            ;;
        --help|-h)
            usage
            ;;
        -*)
            echo "Error: unknown option $1"
            usage
            ;;
        *)
            break
            ;;
    esac
done

if [[ $# -ne 1 ]]; then
    usage
fi

NAME="$1"

# Validate name: alphanumeric and underscores only
if [[ ! "$NAME" =~ ^[a-zA-Z][a-zA-Z0-9_]*$ ]]; then
    echo "Error: name must start with letter and contain only alphanumeric/underscores"
    exit 1
fi

# Derive names
DIR_NAME="xo-${NAME}"
LIB_NAME="xo_${NAME}"
PROJECT_NAME="xo_${NAME}"

# Get script directory to find umbrella root
XO_UMBRELLA_ROOT=$(git rev-parse --show-toplevel)

TARGET_DIR="${XO_UMBRELLA_ROOT}/${DIR_NAME}"

if [[ -d "$TARGET_DIR" ]]; then
    echo "Error: ${TARGET_DIR} already exists"
    exit 1
fi

echo "Creating ${DIR_NAME} (${MODE}) in ${XO_UMBRELLA_ROOT}..."

# Create directories
mkdir -p "${TARGET_DIR}/cmake"
mkdir -p "${TARGET_DIR}/include/xo/${NAME}"

if [[ "$MODE" == "shared" ]]; then
    mkdir -p "${TARGET_DIR}/src"
fi

# Create CMakeLists.txt (different content based on mode)
if [[ "$MODE" == "headeronly" ]]; then
    cat > "${TARGET_DIR}/CMakeLists.txt" << EOF
# ${DIR_NAME}/CMakeLists.txt

cmake_minimum_required(VERSION 3.10)

project(${PROJECT_NAME} VERSION 1.0)
enable_language(CXX)

include(GNUInstallDirs)
include(cmake/xo-bootstrap-macros.cmake)

xo_cxx_toplevel_options3()

# ----------------------------------------------------------------
# c++ settings

# one-time project-specific c++ flags. usually empty
set(PROJECT_CXX_FLAGS "")
add_definitions(\${PROJECT_CXX_FLAGS})

# ----------------------------------------------------------------
# output targets

#add_subdirectory(utest)

# ----------------------------------------------------------------
# header-only library

set(SELF_LIB ${LIB_NAME})
xo_add_headeronly_library(\${SELF_LIB})
xo_install_library4(\${SELF_LIB} \${PROJECT_NAME}Targets)
xo_export_cmake_config(\${PROJECT_NAME} \${PROJECT_VERSION} \${PROJECT_NAME}Targets)

# ----------------------------------------------------------------
# input dependencies
#
# NOTE: dependency set here must be kept consistent with
#       ${DIR_NAME}/cmake/${LIB_NAME}Config.cmake.in

#xo_headeronly_dependency(\${SELF_LIB} xo_flatstring)

# end CMakeLists.txt
EOF
else
    # Shared library mode
    cat > "${TARGET_DIR}/CMakeLists.txt" << EOF
# ${DIR_NAME}/CMakeLists.txt

cmake_minimum_required(VERSION 3.10)

project(${PROJECT_NAME} VERSION 1.0)
enable_language(CXX)

include(GNUInstallDirs)
include(cmake/xo-bootstrap-macros.cmake)

xo_cxx_toplevel_options3()

# ----------------------------------------------------------------
# c++ settings

# one-time project-specific c++ flags. usually empty
set(PROJECT_CXX_FLAGS "")
add_definitions(\${PROJECT_CXX_FLAGS})

# ----------------------------------------------------------------
# output targets

add_subdirectory(src)
#add_subdirectory(utest)

# ----------------------------------------------------------------
# cmake export

xo_export_cmake_config(\${PROJECT_NAME} \${PROJECT_VERSION} \${PROJECT_NAME}Targets)

# end CMakeLists.txt
EOF
fi

# Copy cmake/xo-bootstrap-macros.cmake from xo-cmake/share
cp "${XO_UMBRELLA_ROOT}/xo-cmake/share/xo-macros/xo-bootstrap-macros.cmake" "${TARGET_DIR}/cmake/"

# Create cmake/xo_${NAME}Config.cmake.in
cat > "${TARGET_DIR}/cmake/${LIB_NAME}Config.cmake.in" << EOF
@PACKAGE_INIT@

include(CMakeFindDependencyMacro)

# note: changes to find_dependency() calls here
#       must coordinate with xo_dependency() calls
#       in CMakeLists.txt
#
#find_dependency(xo_flatstring)

include("\${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
check_required_components("@PROJECT_NAME@")
EOF

# Create src/CMakeLists.txt for shared library mode
if [[ "$MODE" == "shared" ]]; then
    cat > "${TARGET_DIR}/src/CMakeLists.txt" << EOF
# ${DIR_NAME}/src/CMakeLists.txt

set(SELF_LIB ${LIB_NAME})
set(SELF_SRCS
    # Add source files here, e.g.:
    # ${NAME}.cpp
)

xo_add_shared_library4(\${SELF_LIB} \${PROJECT_NAME}Targets \${PROJECT_VERSION} 1 \${SELF_SRCS})
xo_install_include_tree3(include/xo/${NAME})

# ----------------------------------------------------------------
# input dependencies
#
# NOTE: dependency set here must be kept consistent with
#       ${DIR_NAME}/cmake/${LIB_NAME}Config.cmake.in

#xo_dependency(\${SELF_LIB} xo_indentlog)

# end src/CMakeLists.txt
EOF
fi

# Create placeholder .gitkeep in include dir
touch "${TARGET_DIR}/include/xo/${NAME}/.gitkeep"

echo ""
echo "Created ${DIR_NAME}/ (${MODE}) with:"
echo "  ${DIR_NAME}/CMakeLists.txt"
echo "  ${DIR_NAME}/cmake/xo-bootstrap-macros.cmake"
echo "  ${DIR_NAME}/cmake/${LIB_NAME}Config.cmake.in"
echo "  ${DIR_NAME}/include/xo/${NAME}/"
if [[ "$MODE" == "shared" ]]; then
    echo "  ${DIR_NAME}/src/CMakeLists.txt"
fi
echo ""
echo "Next steps:"
if [[ "$MODE" == "headeronly" ]]; then
    echo "  1. Add header files to ${DIR_NAME}/include/xo/${NAME}/"
    echo "  2. Add ${DIR_NAME} to umbrella CMakeLists.txt"
    echo "  3. Uncomment dependencies as needed in CMakeLists.txt and Config.cmake.in"
else
    echo "  1. Add header files to ${DIR_NAME}/include/xo/${NAME}/"
    echo "  2. Add source files to ${DIR_NAME}/src/ and update src/CMakeLists.txt SELF_SRCS"
    echo "  3. Add ${DIR_NAME} to umbrella CMakeLists.txt"
    echo "  4. Uncomment dependencies as needed in src/CMakeLists.txt and Config.cmake.in"
fi