cmake_minimum_required(VERSION 3.18)

project(rggb2dng
  VERSION 1.0.0
  DESCRIPTION "Reassemble RGGB TIFF planes into a DNG raw file"
  HOMEPAGE_URL "https://salsa.debian.org/debian/rggb2dng"
  LANGUAGES CXX
)

# ---------------------------------------------------------------------------
# Standards and policies
# ---------------------------------------------------------------------------
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# Export compile commands for clang-tidy
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# ---------------------------------------------------------------------------
# Build type defaults
# ---------------------------------------------------------------------------
if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
    "Build type: Debug Release RelWithDebInfo MinSizeRel" FORCE)
endif()

# ---------------------------------------------------------------------------
# Compiler flags
# ---------------------------------------------------------------------------
# Common warning flags (Clang and GCC)
set(RGGB2DNG_WARN_FLAGS
  -Wall
  -Wextra
  -Wpedantic
  -Wconversion
  -Wshadow
  -Wno-unused-parameter
)

# ---------------------------------------------------------------------------
# Dependencies
# ---------------------------------------------------------------------------
find_package(PkgConfig REQUIRED)

# libtiff
pkg_check_modules(TIFF REQUIRED libtiff-4)

# libmagic (no pkg-config file on Debian; use find_library + find_path)
find_library(MAGIC_LIBRARY NAMES magic REQUIRED)
find_path(MAGIC_INCLUDE_DIR NAMES magic.h REQUIRED)

if(NOT MAGIC_LIBRARY)
  message(FATAL_ERROR "libmagic not found. Install libmagic-dev.")
endif()
if(NOT MAGIC_INCLUDE_DIR)
  message(FATAL_ERROR "magic.h not found. Install libmagic-dev.")
endif()

message(STATUS "libtiff include dirs: ${TIFF_INCLUDE_DIRS}")
message(STATUS "libtiff libraries:    ${TIFF_LIBRARIES}")
message(STATUS "libmagic library:     ${MAGIC_LIBRARY}")
message(STATUS "libmagic include dir: ${MAGIC_INCLUDE_DIR}")

# ---------------------------------------------------------------------------
# Version string — passed directly as a compile definition; no generated
# header needed, so there is no cmake/version.hpp.in dependency.
# ---------------------------------------------------------------------------
add_compile_definitions(RGGB2DNG_VERSION="${PROJECT_VERSION}")

# ---------------------------------------------------------------------------
# Library target (shared, to allow linking by tests and main separately)
# ---------------------------------------------------------------------------
add_library(rggb2dng_lib STATIC
  src/rggb2dng.cpp
)

target_include_directories(rggb2dng_lib
  PUBLIC
    "${CMAKE_CURRENT_SOURCE_DIR}/src"
    "${MAGIC_INCLUDE_DIR}"
    ${TIFF_INCLUDE_DIRS}
)

target_compile_options(rggb2dng_lib PRIVATE ${RGGB2DNG_WARN_FLAGS})

target_link_libraries(rggb2dng_lib
  PUBLIC
    ${TIFF_LIBRARIES}
    ${MAGIC_LIBRARY}
)

# ---------------------------------------------------------------------------
# Executable target
# ---------------------------------------------------------------------------
add_executable(rggb2dng src/main.cpp)

target_include_directories(rggb2dng
  PRIVATE
    "${CMAKE_CURRENT_SOURCE_DIR}/src"
)

target_compile_options(rggb2dng PRIVATE ${RGGB2DNG_WARN_FLAGS})

target_link_libraries(rggb2dng PRIVATE rggb2dng_lib)

# ---------------------------------------------------------------------------
# Tests
# ---------------------------------------------------------------------------
enable_testing()

add_executable(test_rggb2dng test/test_rggb2dng.cpp)
set_target_properties(test_rggb2dng PROPERTIES
  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}"
)

target_include_directories(test_rggb2dng
  PRIVATE
    "${CMAKE_CURRENT_SOURCE_DIR}/src"
    ${TIFF_INCLUDE_DIRS}
)

target_compile_options(test_rggb2dng PRIVATE ${RGGB2DNG_WARN_FLAGS})

target_link_libraries(test_rggb2dng
  PRIVATE
    rggb2dng_lib
    ${TIFF_LIBRARIES}
)

add_test(
  NAME unit_tests
  COMMAND "$<TARGET_FILE:test_rggb2dng>"
)
set_tests_properties(unit_tests PROPERTIES
  TIMEOUT 60
  PASS_REGULAR_EXPRESSION "0 failed"
)

# ---------------------------------------------------------------------------
# clang-tidy (optional, enabled when clang-tidy is found)
# ---------------------------------------------------------------------------
find_program(CLANG_TIDY_EXE clang-tidy)
if(CLANG_TIDY_EXE)
  message(STATUS "clang-tidy found: ${CLANG_TIDY_EXE}")
  set(CLANG_TIDY_CHECKS
    "-*"
    "bugprone-*"
    "clang-analyzer-*"
    "cppcoreguidelines-*"
    "modernize-*"
    "performance-*"
    "portability-*"
    "readability-*"
    "-modernize-use-trailing-return-type"
    "-readability-magic-numbers"
    "-cppcoreguidelines-avoid-magic-numbers"
    "-cppcoreguidelines-pro-bounds-pointer-arithmetic"
  )
  string(JOIN "," CLANG_TIDY_CHECKS_STR ${CLANG_TIDY_CHECKS})
  set_target_properties(rggb2dng rggb2dng_lib PROPERTIES
    CXX_CLANG_TIDY "${CLANG_TIDY_EXE};--checks=${CLANG_TIDY_CHECKS_STR}"
  )
else()
  message(STATUS "clang-tidy not found; skipping static analysis")
endif()

# ---------------------------------------------------------------------------
# Install rules (Debian FHS layout)
# ---------------------------------------------------------------------------
# Install rules (Debian FHS layout)
# ---------------------------------------------------------------------------
include(GNUInstallDirs)

install(TARGETS rggb2dng
  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
)

# Man page — dh_installman will gzip it; install the raw .1 here
install(FILES doc/rggb2dng.1
  DESTINATION "${CMAKE_INSTALL_MANDIR}/man1"
)

# Package documentation
install(FILES CHANGES.md README.md
  DESTINATION "${CMAKE_INSTALL_DOCDIR}"
)

install(FILES debian/copyright
  DESTINATION "${CMAKE_INSTALL_DOCDIR}"
)

# ---------------------------------------------------------------------------
# CPack (used by debian/rules to generate source tarball if needed)
# ---------------------------------------------------------------------------
set(CPACK_PACKAGE_NAME "rggb2dng")
set(CPACK_PACKAGE_VERSION "${PROJECT_VERSION}")
set(CPACK_PACKAGE_CONTACT "Maintainer <maintainer@example.com>")
set(CPACK_SOURCE_GENERATOR "TGZ;TXZ")
set(CPACK_SOURCE_IGNORE_FILES
  "/\\.git/"
  "/build/"
  "\\.o$"
  "\\.a$"
)
include(CPack)