cmake_minimum_required(VERSION 3.20)
project(photo-converter
    VERSION 0.1.0
    DESCRIPTION "Analog film negative to digital positive converter"
    LANGUAGES CXX
)

# ──────────────────────────────────────────────
# C++ Standard
# ──────────────────────────────────────────────
set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# ──────────────────────────────────────────────
# Build options
# ──────────────────────────────────────────────
option(BUILD_TESTS "Build unit tests"          ON)
option(BUILD_GUI   "Build GUI (requires Qt 6)" ON)

# ──────────────────────────────────────────────
# Platform detection
# ──────────────────────────────────────────────
if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
    set(PHOTOCONV_WINDOWS TRUE)
else()
    set(PHOTOCONV_WINDOWS FALSE)
endif()

# ──────────────────────────────────────────────
# Dependencies
# ──────────────────────────────────────────────
# Minimum 4.10 for production; 4.6+ accepted for development.
# Lower the version bound here if building against an older system install.
find_package(OpenCV 4.6 REQUIRED COMPONENTS core imgproc imgcodecs)

# LibRaw: try pkg-config first (Linux/macOS), fall back to find_package (vcpkg Windows)
if(NOT PHOTOCONV_WINDOWS)
    find_package(PkgConfig REQUIRED)
    pkg_check_modules(LIBRAW REQUIRED IMPORTED_TARGET libraw)
    set(LIBRAW_TARGET PkgConfig::LIBRAW)
else()
    # On Windows with vcpkg: find_package(libraw CONFIG) works.
    find_package(libraw CONFIG QUIET)
    if(libraw_FOUND)
        set(LIBRAW_TARGET libraw::libraw)
    else()
        # Fallback: try manual path (MinGW cross-compilation sysroot)
        find_library(LIBRAW_LIB raw REQUIRED)
        find_path(LIBRAW_INCLUDE libraw/libraw.h REQUIRED)
        add_library(libraw_compat INTERFACE IMPORTED)
        target_link_libraries(libraw_compat INTERFACE ${LIBRAW_LIB})
        target_include_directories(libraw_compat INTERFACE ${LIBRAW_INCLUDE})
        set(LIBRAW_TARGET libraw_compat)
    endif()
endif()

if(BUILD_GUI)
    find_package(Qt6 6.4 REQUIRED COMPONENTS Widgets)
    qt_standard_project_setup()
endif()

# ──────────────────────────────────────────────
# Core converter library (no Qt dependency)
# ──────────────────────────────────────────────
add_library(converter_core STATIC
    src/config/AppConfig.cpp
    src/converter/pipeline/Pipeline.cpp
    src/converter/rawloader/RawLoader.cpp
    src/converter/preprocess/Preprocessor.cpp
    src/converter/negative/NegativeDetector.cpp
    src/converter/invert/Inverter.cpp
    src/converter/color/ColorCorrector.cpp
    src/converter/crop/CropProcessor.cpp
    src/converter/output/OutputWriter.cpp
    src/cli/CliRunner.cpp
)

target_include_directories(converter_core PUBLIC
    ${CMAKE_CURRENT_SOURCE_DIR}/src
)

target_link_libraries(converter_core PUBLIC
    ${OpenCV_LIBS}
    ${LIBRAW_TARGET}
)

target_compile_options(converter_core PRIVATE
    $<$<CXX_COMPILER_ID:GNU>:-Wall -Wextra -Wpedantic>
    $<$<CXX_COMPILER_ID:Clang>:-Wall -Wextra -Wpedantic>
    $<$<CXX_COMPILER_ID:MSVC>:/W4>
)

# ──────────────────────────────────────────────
# Main executable
# ──────────────────────────────────────────────
if(BUILD_GUI)
    qt_add_executable(photo-converter
        src/main.cpp
        src/gui/MainWindow.cpp
        src/gui/MainWindow.h
    )

    target_link_libraries(photo-converter PRIVATE
        converter_core
        Qt6::Widgets
    )

    target_include_directories(photo-converter PRIVATE
        ${CMAKE_CURRENT_SOURCE_DIR}/src
    )
else()
    # CLI-only build (no Qt)
    add_executable(photo-converter
        src/main.cpp
    )

    target_link_libraries(photo-converter PRIVATE
        converter_core
    )

    target_compile_definitions(photo-converter PRIVATE NO_GUI=1)

    target_include_directories(photo-converter PRIVATE
        ${CMAKE_CURRENT_SOURCE_DIR}/src
    )
endif()

# Windows: link against winsock / windows socket libraries needed by OpenCV
if(PHOTOCONV_WINDOWS)
    target_link_libraries(photo-converter PRIVATE ws2_32)
endif()

# ──────────────────────────────────────────────
# Install rules
# ──────────────────────────────────────────────
include(GNUInstallDirs)

install(TARGETS photo-converter
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

install(FILES config.ini
    DESTINATION ${CMAKE_INSTALL_DOCDIR}
    RENAME config.ini.example
)

# ──────────────────────────────────────────────
# CPack packaging
# ──────────────────────────────────────────────
set(CPACK_PACKAGE_NAME              "photo-converter")
set(CPACK_PACKAGE_VENDOR            "photo-converter project")
set(CPACK_PACKAGE_DESCRIPTION_SHORT "${PROJECT_DESCRIPTION}")
set(CPACK_PACKAGE_VERSION           "${PROJECT_VERSION}")
set(CPACK_PACKAGE_INSTALL_DIRECTORY "photo-converter")
set(CPACK_RESOURCE_FILE_LICENSE     "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE" )

if(PHOTOCONV_WINDOWS)
    # NSIS installer for Windows
    set(CPACK_GENERATOR "NSIS;ZIP")
    set(CPACK_NSIS_DISPLAY_NAME    "Photo Converter ${PROJECT_VERSION}")
    set(CPACK_NSIS_PACKAGE_NAME    "photo-converter")
    set(CPACK_NSIS_MODIFY_PATH     ON)
    set(CPACK_NSIS_MUI_ICON        "${CMAKE_CURRENT_SOURCE_DIR}/assets/icon.ico")
    set(CPACK_NSIS_MUI_UNIICON     "${CMAKE_CURRENT_SOURCE_DIR}/assets/icon.ico")
else()
    # TGZ + DEB for Linux / ZIP for macOS
    set(CPACK_GENERATOR "TGZ;DEB")
    set(CPACK_DEBIAN_PACKAGE_MAINTAINER "photo-converter project")
    set(CPACK_DEBIAN_PACKAGE_DEPENDS
        "libopencv-core4.10 | libopencv4-java, libraw23, libqt6widgets6")
endif()

include(CPack)

# ──────────────────────────────────────────────
# Tests
# ──────────────────────────────────────────────
if(BUILD_TESTS)
    enable_testing()
    add_subdirectory(tests)
endif()