# Copyright 2012 Prometheus Team
# 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.

GO_VERSION := 1.0.3
LEVELDB_VERSION := 1.7.0
PROTOCOL_BUFFERS_VERSION := 2.4.1

OVERLAY_ROOT := ${HOME}/overlay_root

export PATH := $(PATH):$(OVERLAY_ROOT)/bin
export LD_LIBRARY_PATH := $(LD_LIBRARY_PATH):$(OVERLAY_ROOT)/lib

export CFLAGS := $(CFLAGS) -I$(OVERLAY_ROOT)/include
export CXXFLAGS := $(CXXFLAGS) -I$(OVERLAY_ROOT)/include
export CPPFLAGS := $(CPPFLAGS) -I$(OVERLAY_ROOT)/include
export LDFLAGS := $(LDFLAGS) -L$(OVERLAY_ROOT)/lib
export CGO_CFLAGS := $(CFLAGS)

GO_GET := go get -v -x
APT_GET_INSTALL := sudo apt-get install -y
WGET := wget -c

all: test

preparation: preparation-stamp

preparation-stamp: build-dependencies
	touch $@

build-dependencies: build-dependencies-stamp

build-dependencies-stamp: bison cc mercurial protoc goprotobuf go leveldb levigo gorest
	touch $@

overlay: overlay-stamp

overlay-stamp:
	[ -d "$(OVERLAY_ROOT)" ] || mkdir -vp $(OVERLAY_ROOT)
	touch $@

bison: bison-stamp

bison-stamp:
	[ -x "$$(which bison)" ] || $(APT_GET_INSTALL) bison

cc: cc-stamp

cc-stamp:
	[ -x "$$(which cc)" ] || $(APT_GET_INSTALL) build-essential
	touch $@

go: go-stamp

go-stamp: bison
	gvm install go$(GO_VERSION) || true
	gvm use go$(GO_VERSION) || true
	[ -x "$$(which go)" ]
	touch $@

mercurial: mercurial-stamp

mercurial-stamp:
	[ -x "$$(which hg)" ] || $(APT_GET_INSTALL) mercurial
	touch $@

wget: wget-stamp

wget-stamp:
	[ -x "$$(which wget)" ] || $(APT_GET_INSTALL) wget
	touch $@

protobuf-$(PROTOCOL_BUFFERS_VERSION).tar.bz2: wget
	$(WGET) http://protobuf.googlecode.com/files/$@

protoc: protoc-stamp

protoc-stamp: cc protobuf-$(PROTOCOL_BUFFERS_VERSION).tar.bz2 overlay
	([ ! -x "$$(which protoc)" ] && tar xjvf protobuf-$(PROTOCOL_BUFFERS_VERSION).tar.bz2) || true
	([ ! -x "$$(which protoc)" ] && cd protobuf-$(PROTOCOL_BUFFERS_VERSION) && ./configure --prefix="$(OVERLAY_ROOT)") || true
	([ ! -x "$$(which protoc)" ] && $(MAKE) -C protobuf-$(PROTOCOL_BUFFERS_VERSION)) || true
	([ ! -x "$$(which protoc)" ] && $(MAKE) -C protobuf-$(PROTOCOL_BUFFERS_VERSION) install) || true
	[ -x "$$(which protoc)" ]
	touch $@

goprotobuf: goprotobuf-stamp

goprotobuf-stamp: go protoc source
	$(GO_GET) code.google.com/p/goprotobuf/proto
	$(GO_GET) code.google.com/p/goprotobuf/protoc-gen-go
	touch $@

leveldb: leveldb-stamp

leveldb-stamp: cc rsync leveldb-$(LEVELDB_VERSION).tar.gz overlay
	tar xzvf leveldb-$(LEVELDB_VERSION).tar.gz
	$(MAKE) -C leveldb-$(LEVELDB_VERSION)
	rsync -av "leveldb-$(LEVELDB_VERSION)/include/" "$(OVERLAY_ROOT)/include/"
	rsync -av "leveldb-$(LEVELDB_VERSION)/"*.so* "$(OVERLAY_ROOT)/lib/"
	touch $@

leveldb-$(LEVELDB_VERSION).tar.gz: wget
	$(WGET) http://leveldb.googlecode.com/files/leveldb-$(LEVELDB_VERSION).tar.gz

levigo: levigo-stamp

levigo-stamp: leveldb go source
	$(GO_GET) github.com/jmhodges/levigo
	touch $@

rsync: rsync-stamp

rsync-stamp:
	[ -x "$$(which rsync)" ] || $(APT_GET_INSTALL) rsync

test: test-stamp

test-stamp: preparation source
	cd ${GOPATH}/src/github.com/matttproud
	$(MAKE) test
	touch $@

source: source-stamp

source-stamp:
	-mkdir -vp ${GOPATH}/src/github.com/matttproud
	ln -sf $${PWD} ${GOPATH}/src/github.com/matttproud/prometheus
	touch $@


gorest: gorest-stamp

gorest-stamp: go source
	$(GO_GET) code.google.com/p/gorest
	touch $@

clean:
	-rm *-stamp
	-rm -rf "$(OVERLAY_ROOT)"
	-rm -rf leveldb-$(LEVELDB_VERSION)
	-rm -rf protobuf-$(PROTOCOL_BUFFERS_VERSION)
	-rm leveldb-$(LEVELDB_VERSION).tar.gz
	-rm protobuf-$(PROTOCOL_BUFFERS_VERSION).tar.bz2


.PHONY: all bison build-dependencies cc clean go goprotobuf gorest leveldb levigo mercurial overlay preparation protoc rsync source test wget