#
# Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
#
# This code is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 2 only, as
# published by the Free Software Foundation.  Oracle designates this
# particular file as subject to the "Classpath" exception as provided
# by Oracle in the LICENSE file that accompanied this code.
#
# This code is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# version 2 for more details (a copy is included in the LICENSE file that
# accompanied this code).
#
# You should have received a copy of the GNU General Public License version
# 2 along with this work; if not, write to the Free Software Foundation,
# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
# or visit www.oracle.com if you need additional information or have any
# questions.
#

################################################################
#
# This file contains helper functions for the top-level Makefile that does
# not depend on the spec.gmk file having been read. (The purpose of this
# file is ju to avoid cluttering the top-level Makefile.)
#
################################################################

ifndef _MAKEHELPERS_GMK
_MAKEHELPERS_GMK := 1

##############################
# Stuff to run at include time
##############################

# Find out which variables were passed explicitely on the make command line. These
# will be passed on to sub-makes, overriding spec.gmk settings.
MAKE_ARGS=$(foreach var,$(subst =command,,$(filter %=command,$(foreach var,$(.VARIABLES),$(var)=$(firstword $(origin $(var)))))),$(var)="$($(var))")

list_alt_overrides_with_origins=$(filter ALT_%=environment ALT_%=command,$(foreach var,$(.VARIABLES),$(var)=$(firstword $(origin $(var)))))
list_alt_overrides=$(subst =command,,$(subst =environment,,$(list_alt_overrides_with_origins)))

# Store the build times in this directory.
BUILDTIMESDIR=$(OUTPUT_ROOT)/tmp/buildtimes

# Global targets are possible to run either with or without a SPEC. The prototypical
# global target is "help".
global_targets=help

##############################
# Functions
##############################

define CheckEnvironment
        # Find all environment or command line variables that begin with ALT.
	$(if $(list_alt_overrides),
	  @$(PRINTF) "\nWARNING: You have the following ALT_ variables set:\n"
	  @$(PRINTF) "$(foreach var,$(list_alt_overrides),$(var)=$$$(var))\n"
	  @$(PRINTF) "ALT_ variables are deprecated and will be ignored. Please clean your environment.\n\n"
	)
endef

### Functions for timers

# Record starting time for build of a sub repository.
define RecordStartTime
	$(MKDIR) -p $(BUILDTIMESDIR)
	$(DATE) '+%Y %m %d %H %M %S' | $(NAWK) '{ print $$1,$$2,$$3,$$4,$$5,$$6,($$4*3600+$$5*60+$$6) }' > $(BUILDTIMESDIR)/build_time_start_$1
	$(DATE) '+%Y-%m-%d %H:%M:%S' > $(BUILDTIMESDIR)/build_time_start_$1_human_readable
endef

# Record ending time and calculate the difference and store it in a
# easy to read format. Handles builds that cross midnight. Expects
# that a build will never take 24 hours or more.
define RecordEndTime
	$(DATE) '+%Y %m %d %H %M %S' | $(NAWK) '{ print $$1,$$2,$$3,$$4,$$5,$$6,($$4*3600+$$5*60+$$6) }' > $(BUILDTIMESDIR)/build_time_end_$1
	$(DATE) '+%Y-%m-%d %H:%M:%S' > $(BUILDTIMESDIR)/build_time_end_$1_human_readable
	$(ECHO) `$(CAT) $(BUILDTIMESDIR)/build_time_start_$1` `$(CAT) $(BUILDTIMESDIR)/build_time_end_$1` $1 | \
	    $(NAWK) '{ F=$$7; T=$$14; if (F > T) { T+=3600*24 }; D=T-F; H=int(D/3600); \
	    M=int((D-H*3600)/60); S=D-H*3600-M*60; printf("%02d:%02d:%02d %s\n",H,M,S,$$15); }' \
	    > $(BUILDTIMESDIR)/build_time_diff_$1
endef

# Find all build_time_* files and print their contents in a list sorted
# on the name of the sub repository.
define ReportBuildTimes
	$(BUILD_LOG_WRAPPER) $(PRINTF) -- "----- Build times -------\nStart %s\nEnd   %s\n%s\n%s\n-------------------------\n" \
	    "`$(CAT) $(BUILDTIMESDIR)/build_time_start_TOTAL_human_readable`" \
	    "`$(CAT) $(BUILDTIMESDIR)/build_time_end_TOTAL_human_readable`" \
	    "`$(LS) $(BUILDTIMESDIR)/build_time_diff_* | $(GREP) -v _TOTAL | $(XARGS) $(CAT) | $(SORT) -k 2`" \
	    "`$(CAT) $(BUILDTIMESDIR)/build_time_diff_TOTAL`"
endef

define ResetAllTimers
  $$(shell $(MKDIR) -p $(BUILDTIMESDIR) && $(RM) $(BUILDTIMESDIR)/build_time_*)
endef

define StartGlobalTimer
	$(call RecordStartTime,TOTAL)
endef

define StopGlobalTimer
	$(call RecordEndTime,TOTAL)
endef

### Functions for managing makefile structure (start/end of makefile and individual targets)

# Do not indent this function, this will add whitespace at the start which the caller won't handle
define GetRealTarget
$(strip $(if $(findstring main-wrapper, $(MAKECMDGOALS)), $(MAIN_TARGETS), \
    $(if $(MAKECMDGOALS),$(MAKECMDGOALS),default)))
endef

# Do not indent this function, this will add whitespace at the start which the caller won't handle
define LastGoal
$(strip $(lastword $(call GetRealTarget)))
endef

# Check if the current target is the final target, as specified by
# the user on the command line. If so, call AtRootMakeEnd.
define CheckIfMakeAtEnd
        # Check if the current target is the last goal
	$(if $(filter $@,$(call LastGoal)),$(call AtMakeEnd))
        # If the target is 'foo-only', check if our goal was stated as 'foo'
	$(if $(filter $@,$(call LastGoal)-only),$(call AtMakeEnd))
endef

# Hook to be called when starting to execute a top-level target
define TargetEnter
	$(PRINTF) "## Starting $(patsubst %-only,%,$@)\n"
	$(call RecordStartTime,$(patsubst %-only,%,$@))
endef

# Hook to be called when finish executing a top-level target
define TargetExit
	$(call RecordEndTime,$(patsubst %-only,%,$@))
	$(PRINTF) "## Finished $(patsubst %-only,%,$@) (build time %s)\n\n" \
	    "`$(CAT) $(BUILDTIMESDIR)/build_time_diff_$(patsubst %-only,%,$@) | $(CUT) -f 1 -d ' '`"
endef

# Hook to be called as the very first thing when running a normal build
define AtMakeStart
	$(if $(findstring --jobserver,$(MAKEFLAGS)),$(error make -j is not supported, use make JOBS=n))
	$(call CheckEnvironment)
	$(BUILD_LOG_WRAPPER) $(PRINTF) $(LOG_INFO) "Running make as '$(MAKE) $(MFLAGS) $(MAKE_ARGS)'\n"
	$(BUILD_LOG_WRAPPER) $(PRINTF) "Building $(PRODUCT_NAME) for target '$(call GetRealTarget)' in configuration '$(CONF_NAME)'\n\n"
	$(call StartGlobalTimer)
endef

# Hook to be called as the very last thing for targets that are "top level" targets
define AtMakeEnd
	[ -f $(SJAVAC_SERVER_DIR)/server.port ] && echo Stopping sjavac server && $(TOUCH) $(SJAVAC_SERVER_DIR)/server.port.stop; true
	$(call StopGlobalTimer)
	$(call ReportBuildTimes)
	@$(PRINTF) "\nFinished building $(PRODUCT_NAME) for target '$(call GetRealTarget)'\n"
	$(call CheckEnvironment)
endef

### Functions for parsing and setting up make options from command-line

define FatalError
  # If the user specificed a "global" target (e.g. 'help'), do not exit but continue running
  $$(if $$(filter-out $(global_targets),$$(call GetRealTarget)),$$(error Cannot continue))
endef

define ParseLogLevel
  ifeq ($$(origin VERBOSE),undefined)
    # Setup logging according to LOG (but only if VERBOSE is not given)

    # If the "nofile" argument is given, act on it and strip it away
    ifneq ($$(findstring nofile,$$(LOG)),)
      # Reset the build log wrapper, regardless of other values
      override BUILD_LOG_WRAPPER=
      # COMMA is defined in spec.gmk, but that is not included yet
      COMMA=,
      # First try to remove ",nofile" if it exists
      LOG_STRIPPED1=$$(subst $$(COMMA)nofile,,$$(LOG))
      # Otherwise just remove "nofile"
      LOG_STRIPPED2=$$(subst nofile,,$$(LOG_STRIPPED1))
      # We might have ended up with a leading comma. Remove it
      LOG_STRIPPED3=$$(strip $$(patsubst $$(COMMA)%,%,$$(LOG_STRIPPED2)))
      LOG_LEVEL:=$$(LOG_STRIPPED3)
    else
      LOG_LEVEL:=$$(LOG)
    endif

    ifeq ($$(LOG_LEVEL),)
      # Set LOG to "warn" as default if not set (and no VERBOSE given)
      override LOG_LEVEL=warn
    endif
    ifeq ($$(LOG_LEVEL),warn)
      VERBOSE=-s
    else ifeq ($$(LOG_LEVEL),info)
      VERBOSE=-s
    else ifeq ($$(LOG_LEVEL),debug)
      VERBOSE=
    else ifeq ($$(LOG_LEVEL),trace)
      VERBOSE=
    else
      $$(info Error: LOG must be one of: warn, info, debug or trace.)
      $$(eval $$(call FatalError))
    endif
  else
    # Provide resonable interpretations of LOG_LEVEL if VERBOSE is given.
    ifeq ($(VERBOSE),)
      LOG_LEVEL:=debug
    else
      LOG_LEVEL:=warn
    endif
    ifneq ($$(LOG),)
      # We have both a VERBOSE and a LOG argument. This is OK only if this is a repeated call by ourselves,
      # but complain if this is the top-level make call.
      ifeq ($$(MAKELEVEL),0)
        $$(info Cannot use LOG=$$(LOG) and VERBOSE=$$(VERBOSE) at the same time. Choose one.)
        $$(eval $$(call FatalError))
      endif
    endif
  endif
endef

define ParseConfAndSpec
  ifneq ($$(filter-out $(global_targets),$$(call GetRealTarget)),)
    # If we only have global targets, no need to bother with SPEC or CONF
    ifneq ($$(origin SPEC),undefined)
      # We have been given a SPEC, check that it works out properly
      ifeq ($$(wildcard $$(SPEC)),)
        $$(info Cannot locate spec.gmk, given by SPEC=$$(SPEC))
        $$(eval $$(call FatalError))
      endif
      ifneq ($$(origin CONF),undefined)
        # We also have a CONF argument. This is OK only if this is a repeated call by ourselves,
        # but complain if this is the top-level make call.
        ifeq ($$(MAKELEVEL),0)
          $$(info Cannot use CONF=$$(CONF) and SPEC=$$(SPEC) at the same time. Choose one.)
          $$(eval $$(call FatalError))
        endif
      endif
      # ... OK, we're satisfied, we'll use this SPEC later on
    else
      # Find all spec.gmk files in the build output directory
      output_dir=$$(root_dir)/build
      all_spec_files=$$(wildcard $$(output_dir)/*/spec.gmk)
      ifeq ($$(all_spec_files),)
        $$(info No configurations found for $$(root_dir)! Please run configure to create a configuration.)
        $$(eval $$(call FatalError))
      endif
      # Extract the configuration names from the path
      all_confs=$$(patsubst %/spec.gmk,%,$$(patsubst $$(output_dir)/%,%,$$(all_spec_files)))

      ifneq ($$(origin CONF),undefined)
        # User have given a CONF= argument.
        ifeq ($$(CONF),)
          # If given CONF=, match all configurations
          matching_confs=$$(strip $$(all_confs))
        else
          # Otherwise select those that contain the given CONF string
          matching_confs=$$(strip $$(foreach var,$$(all_confs),$$(if $$(findstring $$(CONF),$$(var)),$$(var))))
        endif
        ifeq ($$(matching_confs),)
          $$(info No configurations found matching CONF=$$(CONF))
          $$(info Available configurations:)
          $$(foreach var,$$(all_confs),$$(info * $$(var)))
          $$(eval $$(call FatalError))
        else
          ifeq ($$(words $$(matching_confs)),1)
            $$(info Building '$$(matching_confs)' (matching CONF=$$(CONF)))
          else
            $$(info Building target '$(call GetRealTarget)' in the following configurations (matching CONF=$$(CONF)):)
            $$(foreach var,$$(matching_confs),$$(info * $$(var)))
          endif
        endif

        # Create a SPEC definition. This will contain the path to one or more spec.gmk files.
        SPEC=$$(addsuffix /spec.gmk,$$(addprefix $$(output_dir)/,$$(matching_confs)))
      else
        # No CONF or SPEC given, check the available configurations
        ifneq ($$(words $$(all_spec_files)),1)
          $$(info No CONF given, but more than one configuration found in $$(output_dir).)
          $$(info Available configurations:)
          $$(foreach var,$$(all_confs),$$(info * $$(var)))
          $$(info Please retry building with CONF=<config pattern> (or SPEC=<specfile>))
          $$(eval $$(call FatalError))
        endif

        # We found exactly one configuration, use it
        SPEC=$$(strip $$(all_spec_files))
      endif
    endif
  endif
endef

### Convenience functions from Main.gmk

# Cleans the component given as $1
define CleanComponent
	@$(PRINTF) "Cleaning $(strip $1) build artifacts ..."
	@($(CD) $(OUTPUT_ROOT) && $(RM) -r $1)
	@$(PRINTF) " done\n"
endef

endif # _MAKEHELPERS_GMK