cmake_minimum_required(VERSION 3.20)

project(gadm-boundaries
    VERSION 1.0.0
    DESCRIPTION "GADM Boundaries Batch Generator (C++)"
    LANGUAGES CXX C
)

# ── C++ standard ─────────────────────────────────────────────────────────────
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# ── Dependencies via vcpkg find_package ──────────────────────────────────────
find_package(GDAL CONFIG REQUIRED)           # target: GDAL::GDAL
find_package(GEOS CONFIG REQUIRED)           # target: GEOS::geos_c
find_package(PROJ CONFIG REQUIRED)           # target: PROJ::proj
find_package(nlohmann_json CONFIG REQUIRED)  # target: nlohmann_json::nlohmann_json

# CLI11 via FetchContent (lightweight, no vcpkg needed)
include(FetchContent)
FetchContent_Declare(
    cli11
    GIT_REPOSITORY https://github.com/CLIUtils/CLI11.git
    GIT_TAG        v2.4.2
    GIT_SHALLOW    TRUE
)
FetchContent_MakeAvailable(cli11)

# ── OpenMP (optional, for country-level parallelism) ─────────────────────────
find_package(OpenMP)

# ── Keep logger package ──────────────────────────────────────────────────────
add_subdirectory(packages/logger)
add_subdirectory(packages/json)

# ── Executable ───────────────────────────────────────────────────────────────
add_executable(boundaries
    src/main.cpp
    src/gpkg_reader.cpp
    src/geo_merge.cpp
    src/ghs_enrich.cpp
)

target_include_directories(boundaries PRIVATE src)

target_link_libraries(boundaries PRIVATE
    CLI11::CLI11
    GDAL::GDAL
    GEOS::geos_c
    PROJ::proj
    nlohmann_json::nlohmann_json
    logger
    json
)

if(OpenMP_CXX_FOUND)
    target_link_libraries(boundaries PRIVATE OpenMP::OpenMP_CXX)
    target_compile_definitions(boundaries PRIVATE HAS_OPENMP=1)
endif()

# ── Compiler warnings ───────────────────────────────────────────────────────
if(MSVC)
    target_compile_options(boundaries PRIVATE /W4 /permissive-)
else()
    target_compile_options(boundaries PRIVATE -Wall -Wextra -Wpedantic)
endif()

# ── Copy data files needed at runtime ────────────────────────────────────────
add_custom_command(TARGET boundaries POST_BUILD
    COMMAND ${CMAKE_COMMAND} -E copy_if_different
        ${CMAKE_SOURCE_DIR}/../data/gadm_continent.json
        $<TARGET_FILE_DIR:boundaries>/gadm_continent.json
)

# ── Dist — copy release artifacts to ../dist/{platform}/ ─────────────────────
if(WIN32)
    set(DIST_DIR "${CMAKE_SOURCE_DIR}/../dist/win-x64")
else()
    set(DIST_DIR "${CMAKE_SOURCE_DIR}/../dist/linux-x64")
endif()

install(TARGETS boundaries
    RUNTIME DESTINATION "${DIST_DIR}"
)

# Post-build: copy binary so `npm run boundaries:cpp` works from dist
add_custom_command(TARGET boundaries POST_BUILD
    COMMAND ${CMAKE_COMMAND} -E make_directory "${DIST_DIR}"
    COMMAND ${CMAKE_COMMAND} -E copy_if_different
        $<TARGET_FILE:boundaries>
        "${DIST_DIR}/"
    COMMENT "Copying boundaries to ${DIST_DIR}/"
)

# Copy dependent DLLs (Windows) or shared libs + proj.db
if(WIN32)
    add_custom_command(TARGET boundaries POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy_directory
            "$<TARGET_FILE_DIR:boundaries>"
            "${DIST_DIR}"
        COMMENT "Copying runtime DLLs to dist/win-x64/"
    )
    # Copy proj.db so PROJ can find its database at runtime
    add_custom_command(TARGET boundaries POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy_if_different
            "${VCPKG_INSTALLED_DIR}/x64-windows/share/proj/proj.db"
            "${DIST_DIR}/proj.db"
        COMMENT "Copying proj.db to dist/win-x64/"
    )
else()
    # On Linux, proj.db is typically in vcpkg's share/proj or system /usr/share/proj
    if(VCPKG_INSTALLED_DIR)
        set(_PROJ_DB_SEARCH "${VCPKG_INSTALLED_DIR}/x64-linux/share/proj/proj.db")
    else()
        set(_PROJ_DB_SEARCH "/usr/share/proj/proj.db")
    endif()
    add_custom_command(TARGET boundaries POST_BUILD
        COMMAND ${CMAKE_COMMAND} -E copy_if_different
            "${_PROJ_DB_SEARCH}"
            "${DIST_DIR}/proj.db"
        COMMENT "Copying proj.db to dist/linux-x64/"
    )
endif()

# ── Tests ────────────────────────────────────────────────────────────────────
enable_testing()
add_subdirectory(tests)