#
# Copyright (C) 2008 The Android Open Source Project
#
# 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.
#

#
# Handle various build version information.
#
# Guarantees that the following are defined:
#     PLATFORM_VERSION
#     PLATFORM_SDK_VERSION
#     PLATFORM_VERSION_CODENAME
#     DEFAULT_APP_TARGET_SDK
#     BUILD_ID
#     BUILD_NUMBER
#     BUILD_DATETIME
#     PLATFORM_SECURITY_PATCH
#

# Look for an optional file containing overrides of the defaults,
# but don't cry if we don't find it.  We could just use -include, but
# the build.prop target also wants INTERNAL_BUILD_ID_MAKEFILE to be set
# if the file exists.
#
INTERNAL_BUILD_ID_MAKEFILE := $(wildcard $(BUILD_SYSTEM)/build_id.mk)
ifdef INTERNAL_BUILD_ID_MAKEFILE
  include $(INTERNAL_BUILD_ID_MAKEFILE)
endif

# Returns all words in $1 up to and including $2
define find_and_earlier
  $(strip $(if $(1),
    $(firstword $(1))
    $(if $(filter $(firstword $(1)),$(2)),,
      $(call find_and_earlier,$(wordlist 2,$(words $(1)),$(1)),$(2)))))
endef

#$(warning $(call find_and_earlier,A B C,A))
#$(warning $(call find_and_earlier,A B C,B))
#$(warning $(call find_and_earlier,A B C,C))
#$(warning $(call find_and_earlier,A B C,D))

define version-list
$(1)PR1 $(1)PD1 $(1)PD2 $(1)PM1 $(1)PM2
endef

ALL_VERSIONS := O P
ALL_VERSIONS := $(foreach v,$(ALL_VERSIONS),$(call version-list,$(v)))

DEFAULT_PLATFORM_VERSION := OPR1

# HACK: forward P to PPR1 until the build server config is updated
ifeq (P,$(TARGET_PLATFORM_VERSION))
  TARGET_PLATFORM_VERSION := PPR1
endif

ifeq (,$(TARGET_PLATFORM_VERSION))
  # Default targeted platform version
  # TODO: PLATFORM_VERSION, PLATFORM_SDK_VERSION, etc. should be conditional
  # on this
  TARGET_PLATFORM_VERSION := $(DEFAULT_PLATFORM_VERSION)
endif

ifeq (,$(filter $(ALL_VERSIONS), $(TARGET_PLATFORM_VERSION)))
$(warning Invalid TARGET_PLATFORM_VERSION '$(TARGET_PLATFORM_VERSION)', must be one of)
$(warning $(ALL_VERSIONS))
$(error Stopping...)
endif

ENABLED_VERSIONS := $(call find_and_earlier,$(ALL_VERSIONS),$(TARGET_PLATFORM_VERSION))

$(foreach v,$(ENABLED_VERSIONS), \
  $(eval IS_AT_LEAST_$(v) := true))

# Default versions for each TARGET_PLATFORM_VERSION

# This is the canonical definition of the platform version,
# which is the version that we reveal to the end user.
# Update this value when the platform version changes (rather
# than overriding it somewhere else).  Can be an arbitrary string.
PLATFORM_VERSION.OPR1 := O

# This is the current development code-name, if the build is not a final
# release build.  If this is a final release build, it is simply "REL".
PLATFORM_VERSION_CODENAME.OPR1 := O

ifndef PLATFORM_VERSION
  PLATFORM_VERSION := $(PLATFORM_VERSION.$(TARGET_PLATFORM_VERSION))
  ifndef PLATFORM_VERSION
    # PLATFORM_VERSION falls back to TARGET_PLATFORM_VERSION
    PLATFORM_VERSION := $(TARGET_PLATFORM_VERSION)
  endif
endif

ifndef PLATFORM_SDK_VERSION
  # This is the canonical definition of the SDK version, which defines
  # the set of APIs and functionality available in the platform.  It
  # is a single integer that increases monotonically as updates to
  # the SDK are released.  It should only be incremented when the APIs for
  # the new release are frozen (so that developers don't write apps against
  # intermediate builds).  During development, this number remains at the
  # SDK version the branch is based on and PLATFORM_VERSION_CODENAME holds
  # the code-name of the new development work.
  PLATFORM_SDK_VERSION := 25
endif

ifndef PLATFORM_JACK_MIN_SDK_VERSION
  # This is definition of the min SDK version given to Jack for the current
  # platform. For released version it should be the same as
  # PLATFORM_SDK_VERSION. During development, this number may be incremented
  # before PLATFORM_SDK_VERSION if the plateform starts to add new java
  # language supports.
  PLATFORM_JACK_MIN_SDK_VERSION := o-b1
endif

ifndef PLATFORM_VERSION_CODENAME
  PLATFORM_VERSION_CODENAME := $(PLATFORM_VERSION_CODENAME.$(TARGET_PLATFORM_VERSION))
  ifndef PLATFORM_VERSION_CODENAME
    # PLATFORM_VERSION_CODENAME falls back to TARGET_PLATFORM_VERSION
    PLATFORM_VERSION_CODENAME := $(TARGET_PLATFORM_VERSION)
  endif

  # This is all of the development codenames that are active.  Should be either
  # the same as PLATFORM_VERSION_CODENAME or a comma-separated list of additional
  # codenames after PLATFORM_VERSION_CODENAME.
  PLATFORM_VERSION_ALL_CODENAMES := $(PLATFORM_VERSION_CODENAME)
endif

ifeq (REL,$(PLATFORM_VERSION_CODENAME))
  PLATFORM_PREVIEW_SDK_VERSION := 0
else
  ifndef PLATFORM_PREVIEW_SDK_VERSION
    # This is the definition of a preview SDK version over and above the current
    # platform SDK version. Unlike the platform SDK version, a higher value
    # for preview SDK version does NOT mean that all prior preview APIs are
    # included. Packages reading this value to determine compatibility with
    # known APIs should check that this value is precisely equal to the preview
    # SDK version the package was built for, otherwise it should fall back to
    # assuming the device can only support APIs as of the previous official
    # public release.
    # This value will always be 0 for release builds.
    PLATFORM_PREVIEW_SDK_VERSION := 0
  endif
endif

ifndef DEFAULT_APP_TARGET_SDK
  # This is the default minSdkVersion and targetSdkVersion to use for
  # all .apks created by the build system.  It can be overridden by explicitly
  # setting these in the .apk's AndroidManifest.xml.  It is either the code
  # name of the development build or, if this is a release build, the official
  # SDK version of this release.
  ifeq (REL,$(PLATFORM_VERSION_CODENAME))
    DEFAULT_APP_TARGET_SDK := $(PLATFORM_SDK_VERSION)
  else
    DEFAULT_APP_TARGET_SDK := $(PLATFORM_VERSION_CODENAME)
  endif
endif

ifndef PLATFORM_SECURITY_PATCH
    #  Used to indicate the security patch that has been applied to the device.
    #  It must signify that the build includes all security patches issued up through the designated Android Public Security Bulletin.
    #  It must be of the form "YYYY-MM-DD" on production devices.
    #  It must match one of the Android Security Patch Level strings of the Public Security Bulletins.
    #  If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
      PLATFORM_SECURITY_PATCH := 2016-11-05
endif

ifndef PLATFORM_BASE_OS
  # Used to indicate the base os applied to the device.
  # Can be an arbitrary string, but must be a single word.
  #
  # If there is no $PLATFORM_BASE_OS set, keep it empty.
  PLATFORM_BASE_OS :=
endif

ifndef BUILD_ID
  # Used to signify special builds.  E.g., branches and/or releases,
  # like "M5-RC7".  Can be an arbitrary string, but must be a single
  # word and a valid file name.
  #
  # If there is no BUILD_ID set, make it obvious.
  BUILD_ID := UNKNOWN
endif

ifndef BUILD_DATETIME
  # Used to reproduce builds by setting the same time. Must be the number
  # of seconds since the Epoch.
  BUILD_DATETIME := $(shell date +%s)
endif

ifneq (,$(findstring Darwin,$(shell uname -sm)))
DATE := date -r $(BUILD_DATETIME)
else
DATE := date -d @$(BUILD_DATETIME)
endif

ifndef BUILD_NUMBER
  # BUILD_NUMBER should be set to the source control value that
  # represents the current state of the source code.  E.g., a
  # perforce changelist number or a git hash.  Can be an arbitrary string
  # (to allow for source control that uses something other than numbers),
  # but must be a single word and a valid file name.
  #
  # If no BUILD_NUMBER is set, create a useful "I am an engineering build
  # from this date/time" value.  Make it start with a non-digit so that
  # anyone trying to parse it as an integer will probably get "0".
  BUILD_NUMBER := eng.$(shell echo $${USER:0:6}).$(shell $(DATE) +%Y%m%d.%H%M%S)
endif
