#
# 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 configure

##############################
# 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 $(MAKECMDGOALS),$(MAKECMDGOALS),all))
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 $(patsubst %-only,%,$@),$(call LastGoal)),$(call AtMakeEnd))
    # If no goal is given, 'all' is default, but the last target executed for all is 'jdk-only'. Check for that, too.
    # At most one of the tests can be true.
    $(if $(subst all,,$(call LastGoal)),,$(if $(filter $@,jdk-only),$(call AtMakeEnd)))
endef

# Hook to be called when starting to execute a top-level target
define TargetEnter
    $(BUILD_LOG_WRAPPER) $(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,%,$@))
    $(BUILD_LOG_WRAPPER) $(PRINTF) "## Finished $(patsubst %-only,%,$@) (build time %s)\n\n" \
        "`$(CAT) $(BUILDTIMESDIR)/build_time_diff_$(patsubst %-only,%,$@) | $(CUT) -f 1 -d ' '`"
    $(call CheckIfMakeAtEnd)
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))
    $(call CheckEnvironment)
    @$(PRINTF) $(LOG_INFO) "Running make as '$(MAKE) $(MFLAGS) $(MAKE_ARGS)'\n"
    @$(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) "Finished 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)%,%,$$(LOG_STRIPPED2)))
          override LOG:=$$(LOG_STRIPPED3)
        endif

        ifeq ($$(LOG),)
            # Set LOG to "warn" as default if not set (and no VERBOSE given)
            override LOG=warn
        endif
        ifeq ($$(LOG),warn)
            VERBOSE=-s
        else ifeq ($$(LOG),info)
            VERBOSE=-s
        else ifeq ($$(LOG),debug)
            VERBOSE=
        else ifeq ($$(LOG),trace)
            VERBOSE=
        else
            $$(info Error: LOG must be one of: warn, info, debug or trace.)
            $$(eval $$(call FatalError))
        endif
    else
        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 $1 build artifacts ..."
    @($(CD) $(OUTPUT_ROOT) && $(RM) -r $1)
    @$(PRINTF) " done\n"
endef

endif # _MAKEHELPERS_GMK