#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# Copyright (C) 2014 Joakim Söderberg <joakim.soderberg@gmail.com>
#


#
# Param _COVERAGE_SRCS	A list of source files that coverage should be collected for.
# Param _COVERALLS_UPLOAD Upload the result to coveralls?
#
function(coveralls_setup _COVERAGE_SRCS _COVERALLS_UPLOAD)

	if (ARGC GREATER 2)
		set(_CMAKE_SCRIPT_PATH ${ARGN})
		message("Coveralls: Using alternate CMake script dir: ${_CMAKE_SCRIPT_PATH}")
	else()
		set(_CMAKE_SCRIPT_PATH ${PROJECT_SOURCE_DIR}/cmake)
	endif()

	if (NOT EXISTS "${_CMAKE_SCRIPT_PATH}/CoverallsClear.cmake")
		message(FATAL_ERROR "Coveralls: Missing ${_CMAKE_SCRIPT_PATH}/CoverallsClear.cmake")
	endif()

	if (NOT EXISTS "${_CMAKE_SCRIPT_PATH}/CoverallsGenerateGcov.cmake")
		message(FATAL_ERROR "Coveralls: Missing ${_CMAKE_SCRIPT_PATH}/CoverallsGenerateGcov.cmake")
	endif()

	# When passing a CMake list to an external process, the list
	# will be converted from the format "1;2;3" to "1 2 3".
	# This means the script we're calling won't see it as a list
	# of sources, but rather just one long path. We remedy this
	# by replacing ";" with "*" and then reversing that in the script
	# that we're calling.
	# http://cmake.3232098.n2.nabble.com/Passing-a-CMake-list-quot-as-is-quot-to-a-custom-target-td6505681.html
	set(COVERAGE_SRCS_TMP ${_COVERAGE_SRCS})
	set(COVERAGE_SRCS "")
	foreach (COVERAGE_SRC ${COVERAGE_SRCS_TMP})
		set(COVERAGE_SRCS "${COVERAGE_SRCS}*${COVERAGE_SRC}")
	endforeach()

	#message("Coverage sources: ${COVERAGE_SRCS}")
	set(COVERALLS_FILE ${PROJECT_BINARY_DIR}/coveralls.json)

	add_custom_target(coveralls_generate

		# Zero the coverage counters.
		COMMAND ${CMAKE_COMMAND}
				-P "${_CMAKE_SCRIPT_PATH}/CoverallsClear.cmake"

		# Run regress tests.
		COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure

		# Generate Gcov and translate it into coveralls JSON.
		# We do this by executing an external CMake script.
		# (We don't want this to run at CMake generation time, but after compilation and everything has run).
		COMMAND ${CMAKE_COMMAND}
				-DCOVERAGE_SRCS="${COVERAGE_SRCS}" # TODO: This is passed like: "a b c", not "a;b;c"
				-DCOVERALLS_OUTPUT_FILE="${COVERALLS_FILE}"
				-DCOV_PATH="${PROJECT_BINARY_DIR}"
				-DPROJECT_ROOT="${PROJECT_SOURCE_DIR}"
				-P "${_CMAKE_SCRIPT_PATH}/CoverallsGenerateGcov.cmake"

		WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
		COMMENT "Generating coveralls output..."
		)

	if (_COVERALLS_UPLOAD)
		message("COVERALLS UPLOAD: ON")

		find_program(CURL_EXECUTABLE curl)

		if (NOT CURL_EXECUTABLE)
			message(FATAL_ERROR "Coveralls: curl not found! Aborting")
		endif()

		add_custom_target(coveralls_upload
			# Upload the JSON to coveralls.
			COMMAND ${CURL_EXECUTABLE}
					-S -F json_file=@${COVERALLS_FILE}
					https://coveralls.io/api/v1/jobs

			DEPENDS coveralls_generate

			WORKING_DIRECTORY ${PROJECT_BINARY_DIR}
			COMMENT "Uploading coveralls output...")

		add_custom_target(coveralls DEPENDS coveralls_upload)
	else()
		message("COVERALLS UPLOAD: OFF")
		add_custom_target(coveralls DEPENDS coveralls_generate)
	endif()

endfunction()

macro(coveralls_turn_on_coverage)
	if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
		message(FATAL_ERROR "Coveralls: Code coverage results with an optimised (non-Debug) build may be misleading! Add -DCMAKE_BUILD_TYPE=Debug")
	endif()

	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -O0 -fprofile-arcs -ftest-coverage")
	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -O0 -fprofile-arcs -ftest-coverage")
endmacro()