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)

# ──────────────────────────────────────────────
# Dependencies
# ──────────────────────────────────────────────
find_package(OpenCV 4.10 REQUIRED COMPONENTS core imgproc imgcodecs)
find_package(PkgConfig REQUIRED)
pkg_check_modules(LIBRAW REQUIRED IMPORTED_TARGET libraw)

if(BUILD_GUI)
    find_package(Qt6 6.8 REQUIRED COMPONENTS Widgets)
    qt_standard_project_setup()
endif()

# ──────────────────────────────────────────────
# Core converter library (no Qt dependency)
# ──────────────────────────────────────────────
add_library(converter_core STATIC
    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}
    PkgConfig::LIBRAW
)

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()

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