cmake_minimum_required(VERSION 3.16)
project(fun VERSION 0.17.2 LANGUAGES C)

set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)

include(GNUInstallDirs)

# Defaults and options migrated from Makefile
# Convenience: default path to bundled stdlib
set(FUN_LIB "${CMAKE_SOURCE_DIR}/lib" CACHE PATH "Path to bundled Fun stdlib")

# Optional: override default library directory for #include <...> lookups
# -DDEFAULT_LIB_DIR=/custom/fun/lib (trailing slash added automatically)
if(NOT DEFINED DEFAULT_LIB_DIR OR DEFAULT_LIB_DIR STREQUAL "")
  if(WIN32)
    set(_FUN_DEFAULT_LIB_DIR "C:/Users/Public/fun/lib")
  elseif(APPLE)
    set(_FUN_DEFAULT_LIB_DIR "/Library/Application Support/fun/lib")
  else()
    set(_FUN_DEFAULT_LIB_DIR "/usr/share/fun/lib")
  endif()
  set(DEFAULT_LIB_DIR "${_FUN_DEFAULT_LIB_DIR}" CACHE PATH "Default library directory for Fun stdlib (override with -DDEFAULT_LIB_DIR=...)" FORCE)
else()
  set(DEFAULT_LIB_DIR "${DEFAULT_LIB_DIR}" CACHE PATH "Default library directory for Fun stdlib (override with -DDEFAULT_LIB_DIR=...)" FORCE)
endif()
# Ensure trailing slash
if(NOT DEFAULT_LIB_DIR MATCHES "/$")
  set(DEFAULT_LIB_DIR "${DEFAULT_LIB_DIR}/")
endif()

# Optional PCSC support (enabled via -DFUN_WITH_PCSC=ON)
option(FUN_WITH_PCSC "Enable PCSC (pcsclite) support" OFF)
set(PCSC_LINK_LIBS "")
set(PCSC_INCLUDE_DIRS "")
if(FUN_WITH_PCSC)
    message(STATUS "Building with PCSC support")
    add_definitions(-DFUN_WITH_PCSC)
    if(APPLE)
        list(APPEND PCSC_LINK_LIBS "-framework PCSC")
    else()
        list(APPEND PCSC_INCLUDE_DIRS "/usr/include/PCSC")
        list(APPEND PCSC_LINK_LIBS pcsclite)
    endif()
endif()

# Debug option to enable verbose parser/VM logging
option(FUN_DEBUG "Enable extra debug logging in Fun" OFF)

# Threads (used by demos and optionally by the runtime)
if(UNIX)
  find_package(Threads QUIET)
endif()

# Core VM/library sources
add_library(fun_core
        src/bytecode.c
        src/parser.c
        src/value.c
        src/vm.c
)

target_include_directories(fun_core PUBLIC
        ${CMAKE_CURRENT_SOURCE_DIR}/src
)

# Apply options to core
if(FUN_DEBUG)
    message(STATUS "FUN_DEBUG enabled: building with verbose debug logging")
    target_compile_definitions(fun_core PUBLIC FUN_DEBUG=1)
endif()

# Provide default stdlib directory to the runtime
target_compile_definitions(fun_core PUBLIC DEFAULT_LIB_DIR="${DEFAULT_LIB_DIR}")

# PCSC include and link (if enabled)
if(PCSC_INCLUDE_DIRS)
  target_include_directories(fun_core PRIVATE ${PCSC_INCLUDE_DIRS})
endif()
if(PCSC_LINK_LIBS)
  target_link_libraries(fun_core PUBLIC ${PCSC_LINK_LIBS})
endif()

# Link threads if available on UNIX
if(Threads_FOUND)
  target_link_libraries(fun_core PUBLIC Threads::Threads)
endif()

# Playground / interpreter (future /usr/bin/fun)
add_executable(fun
        src/fun.c
)
# Provide version string to the CLI
target_compile_definitions(fun PRIVATE FUN_VERSION=\"${PROJECT_VERSION}\")
target_link_libraries(fun PRIVATE fun_core)

# Internal test programs
add_executable(fun_test 
        src/fun_test.c
)
target_link_libraries(fun_test PRIVATE fun_core)

add_executable(test_opcodes 
        src/test_opcodes.c
)
target_link_libraries(test_opcodes PRIVATE fun_core)

# Convenience aggregate target (like 'build' in Makefile)
add_custom_target(build
  DEPENDS fun fun_test test_opcodes
)

# Convenience targets: repl, run, threads-demo, ops, examples
set(FUN_RUN_SCRIPT "" CACHE STRING "Script to run with the 'run' target, e.g. -DFUN_RUN_SCRIPT=examples/strings_test.fun")

add_custom_target(repl
  COMMAND $<TARGET_FILE:fun>
  DEPENDS fun
  USES_TERMINAL
  COMMENT "Run Fun REPL"
)

add_custom_target(run
  COMMAND $<TARGET_FILE:fun> ${FUN_RUN_SCRIPT}
  DEPENDS fun
  USES_TERMINAL
  COMMENT "Run Fun with script: ${FUN_RUN_SCRIPT}"
)

add_custom_target(threads-demo
  COMMAND ${CMAKE_COMMAND} -E echo "Running Thread class demo with FUN_LIB_DIR=${FUN_LIB}"
  COMMAND ${CMAKE_COMMAND} -E env FUN_LIB_DIR="${FUN_LIB}" $<TARGET_FILE:fun> ${CMAKE_SOURCE_DIR}/examples/threads_demo.fun
  DEPENDS fun
  USES_TERMINAL
)

# Python for helper scripts
find_package(Python3 QUIET COMPONENTS Interpreter)
if(Python3_Interpreter_FOUND)
  set(_FUN_PY "${Python3_EXECUTABLE}")
else()
  set(_FUN_PY "python3")
endif()

add_custom_target(ops
  COMMAND ${_FUN_PY} ${CMAKE_SOURCE_DIR}/scripts/check_op_includes.py --verbose
  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
  USES_TERMINAL
  COMMENT "Verbose opcode include check"
)

add_custom_target(ops-quiet
  COMMAND ${_FUN_PY} ${CMAKE_SOURCE_DIR}/scripts/check_op_includes.py
  WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
  USES_TERMINAL
  COMMENT "Opcode include check"
)

add_custom_target(examples
  COMMAND ${CMAKE_COMMAND} -E env FUN_LIB_DIR="${FUN_LIB}" ${CMAKE_SOURCE_DIR}/scripts/run_examples.sh
  DEPENDS fun
  USES_TERMINAL
  COMMENT "Build and run all examples"
)

add_custom_target(run-examples
  COMMAND ${CMAKE_COMMAND} -E env FUN_LIB_DIR="${FUN_LIB}" ${CMAKE_SOURCE_DIR}/scripts/run_examples.sh
  DEPENDS fun
  USES_TERMINAL
  COMMENT "Build and run all examples"
)

# Clean and distclean
add_custom_target(fun_clean
        COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target clean
        COMMENT "Clean build outputs (objects, binaries) in the build directory"
)
add_custom_target(distclean
        COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target clean
        COMMAND ${CMAKE_COMMAND} -E rm -rf
        ${CMAKE_BINARY_DIR}/CMakeCache.txt
        ${CMAKE_BINARY_DIR}/CMakeFiles
        ${CMAKE_BINARY_DIR}/cmake_install.cmake
        ${CMAKE_BINARY_DIR}/install_manifest.txt
        ${CMAKE_BINARY_DIR}/Makefile
        ${CMAKE_BINARY_DIR}/*.ninja
        ${CMAKE_BINARY_DIR}/.ninja_*
        COMMENT "Remove build outputs and CMake-generated files (reconfigure needed)"
)

# Install rules
# Binary
install(TARGETS fun
        RUNTIME DESTINATION /usr/bin)

# Libs
install(DIRECTORY lib/
        DESTINATION /usr/share/fun/lib
        FILES_MATCHING PATTERN "*.fun")

# Optionally install example scripts
option(FUN_INSTALL_EXAMPLES "Install example .fun scripts" ON)
if(FUN_INSTALL_EXAMPLES)
    install(DIRECTORY examples/
            DESTINATION /usr/share/fun/examples
            FILES_MATCHING PATTERN "*.fun")
endif()

# - Docs
install(FILES README.md LICENSE
        DESTINATION /usr/share/doc/fun)