# Let's have fun!
cmake_minimum_required(VERSION 3.0)
project(monkey C)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")
set(CMAKE_INCLUDE_DIRECTORIES_BEFORE ON)

# CMake includes
include(CheckSymbolExists)
include(CheckLibraryExists)
include(CheckIncludeFile)
include(CheckCSourceCompiles)
include(ExternalProject)
include(GNUInstallDirs)

# Set default compiler options
if (NOT CMAKE_SYSTEM_NAME MATCHES "Windows")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -Wall -Wextra")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__='\"$(subst ${CMAKE_SOURCE_DIR}/,,$(abspath \$<))\"'")
else()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D__FILENAME__=__FILE__")
endif()

# Monkey Version
set(MK_VERSION_MAJOR  1)
set(MK_VERSION_MINOR  7)
set(MK_VERSION_PATCH  2)
set(MK_VERSION_STR "${MK_VERSION_MAJOR}.${MK_VERSION_MINOR}.${MK_VERSION_PATCH}")

# Output paths
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/lib")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/library")

# ============================================
# ============= BUILD OPTIONS ================
# ============================================

# Monkey Core
option(MK_DEBUG          "Build with debug symbols"     No)
option(MK_ACCEPT         "Use accept(2) system call"    No)
option(MK_ACCEPT4        "Use accept4(2) system call"  Yes)
option(MK_LINUX_KQUEUE   "Use Linux kqueue emulator"    No)
option(MK_TRACE          "Enable Trace mode"            No)
option(MK_UCLIB          "Enable uClib libc support"    No)
option(MK_MUSL           "Enable Musl libc support"     No)
option(MK_BACKTRACE      "Enable Backtrace feature"    Yes)
option(MK_LINUX_TRACE    "Enable Lttng support"         No)
option(MK_PTHREAD_TLS    "Use old Pthread TLS mode"     No)
option(MK_MBEDTLS_SHARED "Use mbedtls shared lib"       No)
option(MK_VALGRIND       "Enable Valgrind support"      No)
option(MK_FUZZ_MODE      "Enable HonggFuzz mode"        No)
option(MK_HTTP2          "Enable HTTP Support (dev)"    No)
option(MK_TESTS          "Enable Tests"                 No)

# Plugins: what should be build ?, these options
# will be processed later on the plugins/CMakeLists.txt file
option(MK_PLUGIN_AUTH          "Basic authentication"     No)
option(MK_PLUGIN_CGI           "CGI support"              No)
option(MK_PLUGIN_CHEETAH       "Cheetah Shell Interface"  No)
option(MK_PLUGIN_DIRLISTING    "Directory Listing"       Yes)
option(MK_PLUGIN_FASTCGI       "FastCGI"                  No)
option(MK_PLUGIN_LIANA         "Basic network layer"     Yes)
option(MK_PLUGIN_LOGGER        "Log Writer"               No)
option(MK_PLUGIN_MANDRIL       "Security"                Yes)
option(MK_PLUGIN_TLS           "TLS/SSL support"          No)

# Options to build Monkey with/without binary and
# static/dynamic library modes (default is always just
# one target binary).
option(MK_WITHOUT_BIN          "Do not build binary"      No)
option(MK_WITHOUT_CONF         "Skip configuration files" No)
option(MK_STATIC_LIB_MODE      "Static library mode"      No)

# If building just for a "library" mode, disable plugins
if(MK_LIB_ONLY)
  set(MK_PLUGIN_AUTH       No)
  set(MK_PLUGIN_CGI        No)
  set(MK_PLUGIN_CHEETAH    No)
  set(MK_PLUGIN_DIRLISTING No)
  set(MK_PLUGIN_FASTCGI    No)
  set(MK_PLUGIN_LOGGER     No)
  set(MK_PLUGIN_MANDRIL    No)
endif()

if(NOT CMAKE_SYSTEM_NAME STREQUAL "Linux")
  set(MK_ACCEPT        1)
  set(MK_ACCEPT4       0)
  set(MK_SYSTEM_MALLOC 1)
endif()

if(MK_STATIC_PLUGINS)
  set(MK_STATIC_PLUGINS "${MK_STATIC_PLUGINS},liana")
else()
  set(MK_STATIC_PLUGINS "liana")
endif()

# Variable to be populated by plugins/CMakeLists.txt. It will contain the
# code required to initialize any static plugin.
set(STATIC_PLUGINS_INIT "")
set(STATIC_PLUGINS_LIBS "")

# ===========================================
# ============== DEPENDENCIES ===============
# ===========================================

# Find pthreads
find_package(Threads)

if(MK_DEBUG)
  set(CMAKE_BUILD_TYPE "Debug")
endif()

# It set's a definition and register into the mk_info.h file */
macro(MK_DEFINITION var)
  add_definitions(-D${var})
  set(MK_BUILD_FLAGS "${MK_BUILD_FLAGS}#ifndef ${var}\n#define ${var}\n#endif\n")
endmacro()

if (CMAKE_SYSTEM_NAME MATCHES "Windows")
  MK_DEFINITION(_CRT_SECURE_NO_WARNINGS)
endif()

# Enable experimental (dev) HTTP/2 support
if (MK_HTTP2)
  MK_DEFINITION(MK_HAVE_HTTP2)
endif()

# Check for accept(2) v/s accept(4)
list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
check_symbol_exists(accept4 "sys/socket.h" HAVE_ACCEPT4)
list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
if(HAVE_ACCEPT4)
  MK_DEFINITION(MK_HAVE_ACCEPT4)
endif()

# Check for Linux Kqueue library emulator
if(MK_LINUX_KQUEUE)
  find_package(Libkqueue REQUIRED)
  if(NOT LIBKQUEUE_FOUND)
    message(FATAL_ERROR "Linux libkqueue was not found." )
  else()
    MK_DEFINITION(MK_LINUX_KQUEUE)
  endif()
endif()

# Check Trace
if(MK_TRACE)
  MK_DEFINITION(MK_HAVE_TRACE)
endif()

# Check Uclib library
if(MK_UCLIB)
  MK_DEFINITION(MK_HAVE_UCLIB)
endif()

# Check Musl library
if(MK_MUSL)
  MK_DEFINITION(MK_HAVE_MUSL)
endif()

# Check Backtrace support
check_include_file("execinfo.h" HAVE_BACKTRACE)
if (NOT HAVE_BACKTRACE)
  set(MK_BACKTRACE No)
else()
  MK_DEFINITION(MK_HAVE_BACKTRACE)
endif()

# Check for LTTng-UST
if(MK_LINUX_TRACE)
  check_include_file("lttng/tracepoint.h" HAVE_LTTNG)
  if (NOT HAVE_LTTNG)
    message(FATAL_ERROR "LTTng-UST is not installed in your system." )
  else()
    MK_DEFINITION(MK_HAVE_LINUX_TRACE)
  endif()
endif()

# Use old Pthread TLS
if(NOT MK_PTHREAD_TLS)
  check_c_source_compiles("
     __thread int a;
     int main() {
         __tls_get_addr(0);
         return 0;
     }" HAVE_C_TLS)

  if(HAVE_C_TLS)
    MK_DEFINITION(MK_HAVE_C_TLS)
  endif()
endif()

# Valgrind support
check_c_source_compiles("
  #include <valgrind/valgrind.h>
  int main() {
     return 0;
  }" MK_HAVE_VALGRIND)

if(MK_VALGRIND OR MK_HAVE_VALGRIND)
  MK_DEFINITION(MK_HAVE_VALGRIND)
endif()

# Regex support
check_c_source_compiles("
  #include <regex.h>
  int main() {
     regex_t reg;
     const char str[] = \"[a-zA-Z0-9]*\";
     ret = regcomp(&reg, str, REG_EXTENDED|REG_ICASE|REG_NOSUB);
     return 0;
  }" HAVE_REGEX)

if(HAVE_REGEX)
  MK_DEFINITION(MK_HAVE_REGEX)
endif()


# ============================================
# =========== CONFIGURATION FILES=============
# ============================================

# Default values for conf/monkey.conf
set(MK_CONF_LISTEN       "2001")
set(MK_CONF_WORKERS      "0")
set(MK_CONF_TIMEOUT      "15")
set(MK_CONF_PIDFILE      "monkey.pid")
set(MK_CONF_USERDIR      "public_html")
set(MK_CONF_INDEXFILE    "index.html index.htm index.php")
set(MK_CONF_HIDEVERSION  "Off")
set(MK_CONF_RESUME       "On")
set(MK_CONF_USER         "www-data")
set(MK_CONF_KA           "On")
set(MK_CONF_KA_TIMEOUT   "5")
set(MK_CONF_KA_MAXREQ    "1000")
set(MK_CONF_REQ_SIZE     "32")
set(MK_CONF_SYMLINK      "Off")
set(MK_CONF_DEFAULT_MIME "text/plain")
set(MK_CONF_FDT          "On")
set(MK_CONF_OVERCAPACITY "Resist")

# Default values for conf/sites/default
set(MK_VH_SERVERNAME     "127.0.0.1")
set(MK_VH_DOCUMENT_ROOT  MK_DATADIR)
set(MK_VH_LOG_ACCESS     MK_LOGDIR)
set(MK_VH_LOG_ERROR      MK_LOGDIR)

# Paths
if(APPLE)
  set(CMAKE_MACOSX_RPATH ${CMAKE_MACOSX_RPATH};${CMAKE_INSTALL_FULL_LIBDIR}/monkey)
endif()

if(DEFAULT_PORT)
  set(MK_CONF_LISTEN  ${DEFAULT_PORT})
endif()

if(DEFAULT_USER)
  set(MK_CONF_USER ${DEFAULT_USER})
endif()

configure_file(
  "${PROJECT_SOURCE_DIR}/include/monkey/mk_info.h.in"
  "${PROJECT_BINARY_DIR}/include/monkey/mk_info.h"
  )

configure_file(
  "${PROJECT_SOURCE_DIR}/include/monkey/mk_env.h.in"
  "${PROJECT_BINARY_DIR}/include/monkey/mk_env.h"
  )


# General Headers
include_directories(./)
include_directories(deps/rbtree)
include_directories(deps/flb_libco)
include_directories(deps/regex)
include_directories(include)
include_directories(include/monkey/)
include_directories(${CMAKE_CURRENT_BINARY_DIR}/include/)
include_directories(${CMAKE_CURRENT_BINARY_DIR}/include/monkey/)

if (CMAKE_SYSTEM_NAME MATCHES "Windows")
  include_directories(mk_core/deps/libevent/include)
  include_directories("${PROJECT_BINARY_DIR}/mk_core/deps/libevent/include/")
endif()

# Instruct CMake to build the the code base
# =========================================
# mk_core  : generic utilities
# plugins  : plugins for mk_server
# mk_server: server code base: plugins, protocols, scheduler.. (no executable)
# mk_bin   : server executable

add_subdirectory(man)
add_subdirectory(deps/rbtree)
add_subdirectory(deps/regex)
add_subdirectory(deps/flb_libco)
add_subdirectory(mk_core)
add_subdirectory(plugins)
add_subdirectory(mk_server)

if(NOT MK_WITHOUT_BIN)
  add_subdirectory(mk_bin)
endif()

# Configuration, headers generation and others
if(NOT MK_WITHOUT_CONF)
  add_subdirectory(conf)
endif()
add_subdirectory(htdocs)
add_subdirectory(include)

# Install (missings ?) paths
install(DIRECTORY DESTINATION ${MK_PATH_LOG})
install(DIRECTORY DESTINATION ${MK_PATH_PIDPATH})
install(DIRECTORY DESTINATION ${MK_PATH_WWW})

if(NOT SKIP_EMPTY_DIRS)
  install(DIRECTORY DESTINATION ${MK_PATH_PIDPATH})
  install(DIRECTORY DESTINATION ${MK_PATH_LOG})
endif()

add_subdirectory(api)

if(MK_FUZZ_MODE)
  add_subdirectory(fuzz)
endif()

if(MK_TESTS)
  add_subdirectory(test)
endif()