#
#    Copyright (c) 2014-2017 Nest Labs, Inc.
#    All rights reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.
#

#    Description:
#      This file implements a glue makefile for building the Weave SDK
#      for standalone desktop or server build host systems.
#
#      This is strictly a convenience makefile. Such systems can
#      otherwise be built using the usual GNU autotools convention of:
#
#        % ./configure
#        % make
#

# Don't allow this top-level makefile's targets to be built in parallel.

.NOTPARALLEL:

COVERAGE                       ?= 0
DEBUG                          ?= 0
TIMESTAMP                      ?= 0
TUNNEL_FAILOVER                ?= 0
USE_LWIP                       ?= 0
NO_OPENSSL                     ?= 0
BLUEZ                          ?= 0

HOSTOS                          = $(shell uname -s |tr [:upper:] [:lower:])
ARCH                            = $(shell uname -i |tr [:upper:] [:lower:])

ECHO                           := @echo
MAKE                           := make
MKDIR_P                        := mkdir -p
LN_S                           := ln -s
RM_F                           := rm -f

INSTALL                        := /usr/bin/install
INSTALLFLAGS                   := -p

TopSourceDir                   := $(dir $(shell readlink $(firstword $(MAKEFILE_LIST))))
AbsTopSourceDir                := $(dir $(realpath $(firstword $(MAKEFILE_LIST))))

BuildPath                       = build
TopBuildDir                     = $(BuildPath)
AbsTopBuildDir                  = $(CURDIR)/$(TopBuildDir)

ResultPath                      = output
TopResultDir                    = $(ResultPath)
AbsTopResultDir                 = $(CURDIR)/$(TopResultDir)

TargetTuple                     = $(shell ${AbsTopSourceDir}/third_party/nlbuild-autotools/repo/autoconf/config.guess | sed -e 's/[[:digit:].]*$$//g')

ProjectConfigDir               ?= $(AbsTopSourceDir)/build/config/standalone

configure_OPTIONS               = CPPFLAGS="-maes"

# NOTE: Mac OS SDKs generated on OS X Sierra (or higher) seem to have trouble
#       running on El Capitan (or earlier) due to issues with clock_gettime: 
#       declaring the interface in time.h but not making the symbol 
#       available in libSystem.dylib, resulting in a runtime crash. For 
#       now, suppress use of clock_getttime on OS X by overriding 
#       configure and asserting:
#
#         ac_cv_func_clock_gettime=no
#         ac_cv_have_decl_clock_gettime=no
#
#       below.
#

ifeq ($(HOSTOS),darwin)
configure_OPTIONS              += ac_cv_func_clock_gettime=no  ac_cv_have_decl_clock_gettime=no
endif

# By default, build using the system's OpenSSL library, except on OSX which needs
# the Weave internal OpenSSL.
# However, if NO_OPENSSL = 1, build with an alternate configuration that avoids the
# use of OpenSSL.  Note that building with NO_OPENSSL = 1 automatically suppresses
# the building of various command line tools that depend on OpenSSL (e.g. the weave tool).

ifeq ($(NO_OPENSSL),1)
ProjectConfigDir                = $(AbsTopSourceDir)/build/config/standalone/no-openssl
configure_OPTIONS              += --with-openssl=no --disable-tools
else
ifeq ($(HOSTOS),darwin)
ProjectConfigDir                = $(AbsTopSourceDir)/build/config/standalone/darwin
configure_OPTIONS              += --with-openssl=internal
else
configure_OPTIONS              += --with-openssl=
endif
endif

# If the user has asserted COVERAGE, alter the configuration options
# accordingly.

ifeq ($(COVERAGE),1)
# no point in enabling docs generation for a coverage build
configure_OPTIONS              += --enable-coverage --enable-coverage-reports --disable-docs
# Happy checks are time consuming, but on average less processor intensive than
# compiling and running unit-tests.
# Bump the number of builds, it primarily has an effect on the make check
# phase of the build.
BuildJobs                      ?= $(shell echo $$(( `getconf _NPROCESSORS_ONLN` * 2 )) )
endif

# On properly configured 64-bit Linux machines, recognize the
# I686TARGET flag and build the 32-bit image.

ifeq ($(HOSTOS),linux)
ifeq ($(ARCH),x86_64)
ifeq ($(I686TARGET),1)
TargetTuple                     = i686-pc-linux-gnu
configure_OPTIONS              += --build=$(TargetTuple) CFLAGS="-m32 -g -O2"  CXXFLAGS="-m32 -g -O2" LDFLAGS="-m32 -L/usr/lib/i386-linux-gnu/"
endif
endif
endif

# If the user has asserted DEBUG, alter the configuration options
# accordingly.

ifeq ($(DEBUG),1)
configure_OPTIONS              += --enable-debug --enable-optimization=no
else
configure_OPTIONS              += 
endif

# Disable docs generation
ifeq ($(DOCS),0)
configure_OPTIONS              += --disable-docs
else
configure_OPTIONS              +=
endif

# If the user has asserted TIMESTAMP, alter the configuration options
# accordingly.
ifeq ($(TIMESTAMP),1)
configure_OPTIONS              += --enable-stdio-logging-timestamps
else
configure_OPTIONS              +=
endif

# If the user has used tunnel failover, alter the configuration options
# accordingly.
ifeq ($(TUNNEL_FAILOVER),1)
configure_OPTIONS              += --enable-tunnel-failover
else
configure_OPTIONS              +=
endif

# If the user has woble over bluez peripheral, alter the configuration options
# accordingly.
ifeq ($(BLUEZ),1)
configure_OPTIONS              += --enable-experimental --enable-deprecated --enable-testing --enable-tools --disable-systemd --enable-library --enable-debug
else
configure_OPTIONS              += --with-bluez=no
endif

# If the user has asserted HAPPY, alter the configuration options
# accordingly.

ifdef HAPPY
ifeq ($(HAPPY),1)
configure_OPTIONS              += --with-happy
else
ifeq ($(HAPPY),0)
configure_OPTIONS              += --without-happy
else
configure_OPTIONS              += --with-happy=$(HAPPY)
endif
endif
else
configure_OPTIONS              +=
endif

ifdef SERVICE
BuildJobs                       = 1
configure_OPTIONS              += --with-happy-service=$(SERVICE)
ifdef SUITE
configure_OPTIONS              += --with-happy-test-suite=$(SUITE)
else # SUITE
configure_OPTIONS              += --with-happy-test-suite=minimal
endif # SUITE

else # SERVICE

ifdef SUITE
configure_OPTIONS              += --with-happy-test-suite=$(SUITE)
else # SUITE
configure_OPTIONS              += --with-happy-test-suite=all
endif # SUITE
endif # SERVICE

ifdef DNS
configure_OPTIONS              += --with-happy-dns=$(DNS)
else
configure_OPTIONS              +=
endif

# If the user has asserted USE_LWIP, alter the configuration and
# target tuple to use LwIP rather than the expected BSD sockets.

ifeq ($(USE_LWIP),1)
configure_OPTIONS               += --with-target-network=lwip --with-lwip=internal --disable-java
TargetTuple                     := $(TargetTuple)-lwip
endif

ifeq ($(LONG_TESTS),1)
configure_OPTIONS               += --enable-long-tests=yes
endif

ifeq ($(ENABLE_WOBLE_TEST),1)
configure_OPTIONS               += --enable-woble-test=yes
endif

ifndef BuildJobs
BuildJobs := $(shell getconf _NPROCESSORS_ONLN)
endif
JOBSFLAG := -j$(BuildJobs)

#
# configure-arch <target>
#
# Configure the Weave SDK for the specified target.
#
#   target - The target to configure.
#
define configure-target
$(ECHO) "  CONFIG   $(1)..."
(cd $(BuildPath)/$(1) && $(AbsTopSourceDir)/configure \
INSTALL="$(INSTALL) $(INSTALLFLAGS)" \
--prefix=/ \
--exec-prefix=/$(1) \
--with-weave-project-includes=$(ProjectConfigDir) \
$(configure_OPTIONS))
endef # configure-target

#
# build-target <target>
#
# Build the Weave SDK intermediate build products for the specified
# target.
#
#   target - The target to build.
#
define build-target
$(ECHO) "  BUILD    $(1)"
$(MAKE) $(JOBSFLAG) -C $(BuildPath)/$(1) --no-print-directory \
all
endef # build-target

#
# check-target <target>
#
# Check (run unit tests) the Weave SDK for the specified target.
#
#   target - The target to check.
#
define check-target
$(ECHO) "  CHECK    $(1)"
$(MAKE) $(JOBSFLAG) -C $(BuildPath)/$(1) --no-print-directory \
check
endef # check-target

#
# coverage-target <target>
#
# Generate code coverage from unit tests for the Weave SDK for the
# specified target.
#
#   target - The target to generate code coverage for.
#
define coverage-target
$(ECHO) "  COVERAGE $(1)"
$(MAKE) $(JOBSFLAG) -C $(BuildPath)/$(1) --no-print-directory \
coverage
endef # coverage-target

#
# stage-target <target>
#
# Stage (install) the Weave SDK final build products for the specified
# target.
#
#   target - The target to stage.
#
define stage-target
$(ECHO) "  STAGE    $(1)"
$(MAKE) $(JOBSFLAG) -C $(BuildPath)/$(1) --no-print-directory \
DESTDIR=$(AbsTopResultDir) \
install
endef # stage-target

#
# pretty-target <target>
#
# Prettyify the Weave SDK source code for the specified target.
#
#   target - The target to prettify.
#
define pretty-target
$(ECHO) "  PRETTY   $(1)"
$(MAKE) $(JOBSFLAG) -C $(BuildPath)/$(1) --no-print-directory \
pretty
endef # pretty-target

#
# pretty-check-target <target>
#
# Pretty-check (lint) the Weave SDK source code for the specified
# target.
#
#   target - The target to pretty-check (lint).
#
define pretty-check-target
$(ECHO) "  PRETTY   $(1)"
$(MAKE) $(JOBSFLAG) -C $(BuildPath)/$(1) --no-print-directory \
pretty-check
endef # pretty-check-target

#
# TARGET_template <target>
#
# Define macros, targets and rules to configure, build, and stage the
# Weave SDK for a single target.
#
#   target - The target to instantiate the template for.
#
define TARGET_template
CONFIGURE_TARGETS    += configure-$(1)
BUILD_TARGETS        += do-build-$(1)
CHECK_TARGETS        += check-$(1)
COVERAGE_TARGETS     += coverage-$(1)
STAGE_TARGETS        += stage-$(1)
PRETTY_TARGETS       += pretty-$(1)
PRETTY_CHECK_TARGETS += pretty-check-$(1)
BUILD_DIRS           += $(BuildPath)/$(1)
DIRECTORIES          += $(BuildPath)/$(1)

configure-$(1): $(BuildPath)/$(1)/config.status

$(BuildPath)/$(1)/config.status: | $(BuildPath)/$(1)
	$$(call configure-target,$(1))

do-build-$(1): configure-$(1)

do-build-$(1):
	$$(call build-target,$(1))

check-$(1): do-build-$(1)

check-$(1):
	$$(call check-target,$(1))

coverage-$(1): do-build-$(1)

coverage-$(1):
	$$(call coverage-target,$(1))

stage-$(1): do-build-$(1)

stage-$(1): | $(TopResultDir)
	$$(call stage-target,$(1))

pretty-$(1): configure-$(1)
	$$(call pretty-target,$(1))

lint-$(1) pretty-check-$(1): configure-$(1)
	$$(call pretty-check-target,$(1))

$(1): stage-$(1)
endef # TARGET_template

.PHONY : clean ensure-sudo help

ensure-sudo:
	$(ECHO) "Selected target will require sudo access."
	@sudo echo "Sudo access granted"

.DEFAULT_GOAL := all

all: stage

# Instantiate an target-specific build template for the target.

$(eval $(call TARGET_template,$(TargetTuple)))

#
# Common / Finalization
#

configure: $(CONFIGURE_TARGETS)

build: $(BUILD_TARGETS)

check: ensure-sudo $(CHECK_TARGETS)

coverage: ensure-sudo $(COVERAGE_TARGETS)

stage: $(STAGE_TARGETS)

pretty: $(PRETTY_TARGETS)

lint pretty-check: $(PRETTY_CHECK_TARGETS)

DIRECTORIES     = $(TopResultDir) $(TopResultDir)/$(TargetTuple)/lib $(BUILD_DIRS)

CLEAN_DIRS      = $(TopResultDir) $(BUILD_DIRS)

all: stage

$(DIRECTORIES):
	$(ECHO) "  MKDIR    $@"
	@$(MKDIR_P) "$@"

clean:
	$(ECHO) "  CLEAN"
	@$(RM_F) -r $(CLEAN_DIRS)

help:
	$(ECHO) "Simply type 'make -f $(firstword $(MAKEFILE_LIST))' to build Weave for the following "
	$(ECHO) "target:"
	$(ECHO) ""
	$(ECHO) "    $(TargetTuple)"
	$(ECHO) ""
	$(ECHO) "You may want or need to override the following make variables either on the "
	$(ECHO) "command line or in the environment: "
	$(ECHO) ""
	$(ECHO) "  DEBUG                   Enable Weave debug code and logging (default: '$(DEBUG)')."
	$(ECHO) ""
	$(ECHO) "  COVERAGE                Enable generation of code coverage information "
	$(ECHO) "                          (default: '$(COVERAGE)')."
	$(ECHO) ""
	$(ECHO) "  TIMESTAMP               Configure standalone logging module to output "
	$(ECHO) "                          timestamps (default: '$(TIMESTAMP)')."
	$(ECHO) ""
	$(ECHO) "  USE_LWIP                Build the standalone configuration against the LwIP "
	$(ECHO) "                          library rather than against sockets (default '$(USE_LWIP)')."
	$(ECHO) "  "
	$(ECHO) "  BLUEZ                   Enable support for BLE peripheral using BlueZ bindings"
	$(ECHO) ""
	$(ECHO) "  NO_OPENSSL              Build an alternate configuration that does not depend"
	$(ECHO) "                          on the use of OpenSSL (default: '$(NO_OPENSSL)'.  Note"
	$(ECHO) "                          that the various command line tools that depend on"
	$(ECHO) "                          OpenSSL (e.g., the weave tool) will not be built in"
	$(ECHO) "                          this configuration."
	$(ECHO) ""
	$(ECHO) "  TUNNEL_FAILOVER         Build support for redundant VPN to the Weave service "
	$(ECHO) "                          (default: '$(TUNNEL_FAILOVER)')."
	$(ECHO) ""
	$(ECHO) "  I686TARGET              On a properly configured 64-bit Linux with multilib "
	$(ECHO) "                          support, build a 32-bit target (default: '$(I686TARGET)')."
	$(ECHO) ""
	$(ECHO) "  DOCS                    Build Doxygen-generated documentation (default: '$(DOCS)')."
	$(ECHO) "                          Note this flag only has an effect when Doxygen is"
	$(ECHO) "                          installed."
	$(ECHO) ""
	$(ECHO) "  HAPPY                   When set to 0, skip the functional tests that require"
	$(ECHO) "                          Happy orchestration tool.  When set to 1, pick the"
	$(ECHO) "                          default location to the Happy tool.  When set to any"
	$(ECHO) "                          other value, the value is treated as the location of"
	$(ECHO) "                          the Happy tool."
	$(ECHO) ""