# This file is part of MXE.
# See index.html for further information.

MXE_TARGET_LIST    := i686-pc-mingw32 x86_64-w64-mingw32 i686-w64-mingw32
MXE_TARGETS        := i686-pc-mingw32
DEFAULT_MAX_JOBS   := 6
SOURCEFORGE_MIRROR := freefr.dl.sourceforge.net
PKG_MIRROR         := s3.amazonaws.com/mxe-pkg
PKG_CDN            := d1yihgixbnrglp.cloudfront.net

PWD        := $(shell pwd)
SHELL      := bash
NPROCS     := $(shell nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 1)
JOBS       := $(shell printf "$(DEFAULT_MAX_JOBS)\n$(NPROCS)" | sort -n | head -1)

DATE       := $(shell gdate --help >/dev/null 2>&1 && echo g)date
INSTALL    := $(shell ginstall --help >/dev/null 2>&1 && echo g)install
LIBTOOL    := $(shell glibtool --help >/dev/null 2>&1 && echo g)libtool
LIBTOOLIZE := $(shell glibtoolize --help >/dev/null 2>&1 && echo g)libtoolize
PATCH      := $(shell gpatch --help >/dev/null 2>&1 && echo g)patch
SED        := $(shell gsed --help >/dev/null 2>&1 && echo g)sed
SORT       := $(shell gsort --help >/dev/null 2>&1 && echo g)sort
WGET       := wget --no-check-certificate \
                   --user-agent=$(shell wget --version | \
                   $(SED) -n 's,GNU \(Wget\) \([0-9.]*\).*,\1/\2,p')

REQUIREMENTS := autoconf automake bash bison bzip2 cmake flex \
                gcc g++ intltoolize $(LIBTOOL) $(LIBTOOLIZE) \
                $(MAKE) openssl $(PATCH) $(PERL) pkg-config \
                scons $(SED) $(SORT) unzip wget xz

PREFIX     := $(PWD)/usr
LOG_DIR    := $(PWD)/log
TIMESTAMP  := $(shell date +%Y%m%d_%H%M%S)
PKG_DIR    := $(PWD)/pkg
TMP_DIR     = $(PWD)/tmp-$(1)
MAKEFILE   := $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
TOP_DIR    := $(patsubst %/,%,$(dir $(MAKEFILE)))
PKGS       := $(shell $(SED) -n 's/^.* class="package">\([^<]*\)<.*$$/\1/p' '$(TOP_DIR)/index.html')
BUILD      := $(shell '$(TOP_DIR)/tools/config.guess')
BUILD_PKGS := $(shell grep -l 'BUILD_$$(BUILD)' '$(TOP_DIR)/src/'*.mk | $(SED) -n 's,.*src/\(.*\)\.mk,\1,p')
PATH       := $(PREFIX)/$(BUILD)/bin:$(PREFIX)/bin:$(PATH)

# install config.guess for general use
$(shell $(INSTALL) -d '$(PREFIX)/bin')
$(shell $(INSTALL) -m755 '$(TOP_DIR)/tools/config.guess' '$(PREFIX)/bin/')

# use a minimal whitelist of safe environment variables
ENV_WHITELIST := PATH LANG MAKE% MXE% %PROXY %proxy
unexport $(filter-out $(ENV_WHITELIST),$(shell env | cut -d '=' -f1))

SHORT_PKG_VERSION = \
    $(word 1,$(subst ., ,$($(1)_VERSION))).$(word 2,$(subst ., ,$($(1)_VERSION)))

UNPACK_ARCHIVE = \
    $(if $(filter %.tgz,     $(1)),tar xzf '$(1)', \
    $(if $(filter %.tar.gz,  $(1)),tar xzf '$(1)', \
    $(if $(filter %.tar.bz2, $(1)),tar xjf '$(1)', \
    $(if $(filter %.tar.lzma,$(1)),xz -dc -F lzma '$(1)' | tar xf -, \
    $(if $(filter %.tar.xz,$(1)),xz -dc '$(1)' | tar xf -, \
    $(if $(filter %.zip,     $(1)),unzip -q '$(1)', \
    $(error Unknown archive format: $(1))))))))

UNPACK_PKG_ARCHIVE = \
    $(call UNPACK_ARCHIVE,$(PKG_DIR)/$($(1)_FILE))

PKG_CHECKSUM = \
    openssl sha1 '$(PKG_DIR)/$($(1)_FILE)' 2>/dev/null | $(SED) -n 's,^.*\([0-9a-f]\{40\}\)$$,\1,p'

CHECK_PKG_ARCHIVE = \
    [ '$($(1)_CHECKSUM)' == "`$$(call PKG_CHECKSUM,$(1))`" ]

ESCAPE_PKG = \
	echo '$($(1)_FILE)' | perl -lpe 's/([^A-Za-z0-9])/sprintf("%%%02X", ord($$$$1))/seg'

DOWNLOAD_PKG_ARCHIVE = \
        mkdir -p '$(PKG_DIR)' && \
        $(if $($(1)_URL_2), \
            ( $(WGET) -T 30 -t 3 -O- '$($(1)_URL)' || \
              $(WGET) -O- '$($(1)_URL_2)' || \
              $(WGET) -O- $(PKG_MIRROR)/`$(call ESCAPE_PKG,$(1))` || \
              $(WGET) -O- $(PKG_CDN)/`$(call ESCAPE_PKG,$(1))` ), \
            ( $(WGET) -O- '$($(1)_URL)' || \
              $(WGET) -O- $(PKG_MIRROR)/`$(call ESCAPE_PKG,$(1))` || \
              $(WGET) -O- $(PKG_CDN)/`$(call ESCAPE_PKG,$(1))` )) \
        $(if $($(1)_FIX_GZIP), \
            | gzip -d | gzip -9n, \
            ) \
        > '$(PKG_DIR)/$($(1)_FILE)' || \
        ( echo; \
          echo 'Download failed!'; \
          echo; \
          rm -f '$(PKG_DIR)/$($(1)_FILE)'; )

ifeq ($(IGNORE_SETTINGS),yes)
    $(info [ignore settings.mk])
else ifeq ($(wildcard $(PWD)/settings.mk),$(PWD)/settings.mk)
    include $(PWD)/settings.mk
else
    $(info [create settings.mk])
    $(shell { \
        echo '#JOBS := $(JOBS)'; \
        echo '#MXE_TARGETS := $(MXE_TARGET_LIST)'; \
        echo '#SOURCEFORGE_MIRROR := downloads.sourceforge.net'; \
        echo '#LOCAL_PKG_LIST := boost curl file flac lzo pthreads vorbis wxwidgets'; \
        echo '#.DEFAULT local-pkg-list:'; \
        echo '#local-pkg-list: $$(LOCAL_PKG_LIST)'; \
    } >'$(PWD)/settings.mk')
endif

.PHONY: all
all: all-filtered

.PHONY: check-requirements
define CHECK_REQUIREMENT
    @if ! $(1) --help &>/dev/null; then \
        echo; \
        echo 'Missing requirement: $(1)'; \
        echo; \
        echo 'Please have a look at "index.html" to ensure'; \
        echo 'that your system meets all requirements.'; \
        echo; \
        exit 1; \
    fi

endef
define CHECK_REQUIREMENT_VERSION
    @if ! $(1) --version | head -1 | grep ' \($(2)\)$$' >/dev/null; then \
        echo; \
        echo 'Wrong version of requirement: $(1)'; \
        echo; \
        echo 'Please have a look at "index.html" to ensure'; \
        echo 'that your system meets all requirements.'; \
        echo; \
        exit 1; \
    fi

endef
$(shell [ -d '$(PREFIX)/installed' ] || mkdir -p '$(PREFIX)/installed')

check-requirements: $(PREFIX)/installed/check-requirements
$(PREFIX)/installed/check-requirements: $(MAKEFILE)
	@echo '[check requirements]'
	$(foreach REQUIREMENT,$(REQUIREMENTS),$(call CHECK_REQUIREMENT,$(REQUIREMENT)))
	$(call CHECK_REQUIREMENT_VERSION,autoconf,2\.6[4-9]\|2\.[7-9][0-9])
	$(call CHECK_REQUIREMENT_VERSION,automake,1\.[1-9][0-9]\(\.[0-9]\+\)\?)
	@touch '$@'

define newline


endef

include $(patsubst %,$(TOP_DIR)/src/%.mk,$(PKGS))

.PHONY: download
download: $(addprefix download-,$(PKGS))

.PHONY: build-requirements
build-requirements:
	@$(MAKE) -f '$(MAKEFILE)' $(BUILD_PKGS) MXE_TARGETS=$(BUILD) DONT_CHECK_REQUIREMENTS=true

define TARGET_DEPS
$(1)_DEPS := $(shell echo '$(MXE_TARGETS)' | \
                     $(SED) -n 's,.*$(1)\(.*\),\1,p' | \
                     awk '{print $$1}')
endef
$(foreach TARGET,$(MXE_TARGETS),$(eval $(call TARGET_DEPS,$(TARGET))))

TARGET_HEADER = \
    $(strip with \
	$(if $(value MAKECMDGOALS),\
		$(words $(MAKECMDGOALS)) goal$(shell [ $(words $(MAKECMDGOALS)) == 1 ] || echo s) from command line,\
	$(if $(value LOCAL_PKG_LIST),\
		$(words $(LOCAL_PKG_LIST)) goal$(shell [ $(words $(LOCAL_PKG_LIST)) == 1 ] || echo s) from settings.mk,\
		$(words $(PKGS)) goal$(shell [ $(words $(PKGS)) == 1 ] || echo s) from src/*.mk)))

define TARGET_RULE
.PHONY: $(1)
$(1): | $(if $(value $(1)_DEPS), \
			$(if $(value MAKECMDGOALS),\
				$(addprefix $(PREFIX)/$($(1)_DEPS)/installed/,$(MAKECMDGOALS)), \
				$(if $(value LOCAL_PKG_LIST),\
					$(addprefix $(PREFIX)/$($(1)_DEPS)/installed/,$(LOCAL_PKG_LIST)), \
					$(addprefix $(PREFIX)/$($(1)_DEPS)/installed/,$(PKGS))))) \
		$($(1)_DEPS)
	@echo '[target]   $(1) $(call TARGET_HEADER)'
endef
$(foreach TARGET,$(MXE_TARGETS),$(eval $(call TARGET_RULE,$(TARGET))))

define PKG_RULE
.PHONY: download-$(1)
download-$(1):: $(addprefix download-,$($(1)_DEPS) $($(1)_DEPS_$(3)))
	if ! $(call CHECK_PKG_ARCHIVE,$(1)); then \
	    $(call DOWNLOAD_PKG_ARCHIVE,$(1)); \
	    $(call CHECK_PKG_ARCHIVE,$(1)) || { echo 'Wrong checksum!'; exit 1; }; \
	fi

.PHONY: $(1)
$(1): $(PREFIX)/$(3)/installed/$(1)
$(PREFIX)/$(3)/installed/$(1): $(TOP_DIR)/src/$(1).mk \
                          $(wildcard $(TOP_DIR)/src/$(1)-*.patch) \
                          $(wildcard $(TOP_DIR)/src/$(1)-test*) \
                          $(addprefix $(PREFIX)/$(3)/installed/,$($(1)_DEPS) $($(1)_DEPS_$(3))) \
                          | $(if $(DONT_CHECK_REQUIREMENTS),,check-requirements) $(3)
	@[ -d '$(LOG_DIR)/$(TIMESTAMP)' ] || mkdir -p '$(LOG_DIR)/$(TIMESTAMP)'
	@if ! $(call CHECK_PKG_ARCHIVE,$(1)); then \
	    echo '[download] $(1)'; \
	    ($(call DOWNLOAD_PKG_ARCHIVE,$(1))) &> '$(LOG_DIR)/$(TIMESTAMP)/$(1)-download'; \
	    ln -sf '$(TIMESTAMP)/$(1)-download' '$(LOG_DIR)/$(1)-download'; \
	    if ! $(call CHECK_PKG_ARCHIVE,$(1)); then \
	        echo; \
	        echo 'Download failed or wrong checksum of package $(1)!'; \
	        echo '------------------------------------------------------------'; \
	        tail -n 10 '$(LOG_DIR)/$(1)-download' | $(SED) -n '/./p'; \
	        echo '------------------------------------------------------------'; \
	        echo '[log]      $(LOG_DIR)/$(1)-download'; \
	        echo; \
	        exit 1; \
	    fi; \
	fi
	$(if $(or $(value $(1)_BUILD_$(3)),\
	          $(and $(value $(1)_BUILD),$(findstring undefined,$(origin $(1)_BUILD_$(3))))),
	    @echo '[build]    $(1)',
	    $(if $(findstring undefined,$(origin $(1)_BUILD_$(3))),
	        @echo '[no-op]    $(1)',
	        @echo '[exclude]  $(1)'
	     )
	 )
	@touch '$(LOG_DIR)/$(TIMESTAMP)/$(1)_$(3)'
	@[ $(words $(MXE_TARGETS)) == 1 ] || ln -sf '$(TIMESTAMP)/$(1)_$(3)' '$(LOG_DIR)/$(1)_$(3)'
	@ln -sf '$(TIMESTAMP)/$(1)_$(3)' '$(LOG_DIR)/$(1)'
	@if ! (time $(MAKE) -f '$(MAKEFILE)' 'build-only-$(1)_$(3)') &> '$(LOG_DIR)/$(TIMESTAMP)/$(1)_$(3)'; then \
	    echo; \
	    echo 'Failed to build package $(1)!'; \
	    echo '------------------------------------------------------------'; \
	    tail -n 10 '$(LOG_DIR)/$(1)' | $(SED) -n '/./p'; \
	    echo '------------------------------------------------------------'; \
	    echo '[log]      $(LOG_DIR)/$(1)'; \
	    echo; \
	    (echo; \
	     find '$(2)' -name 'config.log' -print -exec cat {} \;; \
	     echo; \
	     echo 'settings.mk'; \
	     cat '$(TOP_DIR)/settings.mk'; \
	     ) >> '$(LOG_DIR)/$(TIMESTAMP)/$(1)_$(3)'; \
	    exit 1; \
	fi
	@echo '[done]     $(1)'

.PHONY: build-only-$(1)_$(3)
build-only-$(1)_$(3): PKG = $(1)
build-only-$(1)_$(3): TARGET = $(3)
build-only-$(1)_$(3): CMAKE_TOOLCHAIN_FILE = $(PREFIX)/$(3)/share/cmake/mxe-conf.cmake
build-only-$(1)_$(3):
	$(if $(or $(value $(1)_BUILD_$(3)),\
	          $(and $(value $(1)_BUILD),$(findstring undefined,$(origin $(1)_BUILD_$(3))))),
	    uname -a
	    git show-branch --list --reflog=1
	    lsb_release -a 2>/dev/null || sw_vers 2>/dev/null || true
	    rm -rf   '$(2)'
	    mkdir -p '$(2)'
	    cd '$(2)' && $(call UNPACK_PKG_ARCHIVE,$(1))
	    cd '$(2)/$($(1)_SUBDIR)'
	    $(foreach PKG_PATCH,$(sort $(wildcard $(TOP_DIR)/src/$(1)-*.patch)),
	        (cd '$(2)/$($(1)_SUBDIR)' && $(PATCH) -p1 -u) < $(PKG_PATCH))
	    $$(call $(if $(value $(1)_BUILD_$(3)),$(1)_BUILD_$(3),$(1)_BUILD),$(2)/$($(1)_SUBDIR),$(TOP_DIR)/src/$(1)-test)
	    (du -k -d 0 '$(2)' 2>/dev/null || du -k --max-depth 0 '$(2)') | $(SED) -n 's/^\(\S*\).*/du: \1 KiB/p'
	    rm -rfv  '$(2)'
	    ,)
	touch '$(PREFIX)/$(3)/installed/$(1)'
endef
$(foreach TARGET,$(MXE_TARGETS), \
    $(shell [ -d '$(PREFIX)/$(TARGET)/installed' ] || mkdir -p '$(PREFIX)/$(TARGET)/installed') \
    $(foreach PKG,$(PKGS), \
        $(eval $(call PKG_RULE,$(PKG),$(call TMP_DIR,$(PKG)),$(TARGET)))))

# convenience set-like functions for unique lists
SET_APPEND = \
    $(eval $(1) := $(sort $($(1)) $(2)))

SET_CLEAR = \
    $(eval $(1) := )

# WALK functions accept a list of pkgs and/or wildcards
WALK_UPSTREAM = \
    $(strip \
        $(foreach PKG,$(filter $(1),$(PKGS)),\
            $(foreach DEP,$($(PKG)_DEPS) $(foreach TARGET,$(MXE_TARGETS),$($(PKG)_DEPS_$(TARGET))),\
                $(if $(filter-out $(PKGS_VISITED),$(DEP)),\
                    $(call SET_APPEND,PKGS_VISITED,$(DEP))\
                    $(call WALK_UPSTREAM,$(DEP))\
                    $(DEP)))))

# not really walking downstream - that seems to be quadratic, so take
# a linear approach and filter the fully expanded upstream for each pkg
WALK_DOWNSTREAM = \
    $(strip \
        $(foreach PKG,$(PKGS),\
            $(call SET_CLEAR,PKGS_VISITED)\
            $(eval $(PKG)_DEPS_ALL := $(call WALK_UPSTREAM,$(PKG))))\
        $(foreach PKG,$(PKGS),\
            $(if $(filter $(1),$($(PKG)_DEPS_ALL)),$(PKG))))

# EXCLUDE_PKGS can be a list of pkgs and/or wildcards
RECURSIVELY_EXCLUDED_PKGS = \
    $(sort \
        $(filter $(EXCLUDE_PKGS),$(PKGS))\
        $(call SET_CLEAR,PKGS_VISITED)\
        $(call WALK_DOWNSTREAM,$(EXCLUDE_PKGS)))

.PHONY: all-filtered
all-filtered: $(filter-out $(call RECURSIVELY_EXCLUDED_PKGS),$(PKGS))

# print a list of upstream dependencies and downstream dependents
show-deps-%:
	$(call SET_CLEAR,PKGS_VISITED)
	$(info $* upstream dependencies:$(newline)\
	    $(call WALK_UPSTREAM,$*)\
	    $(newline)$(newline)$* downstream dependents:$(newline)\
	    $(call WALK_DOWNSTREAM,$*))
	@echo

# show upstream dependencies and downstream dependents separately
# suitable for usage in shell with: `make show-downstream-deps-foo`
# @echo -n suppresses the "Nothing to be done" without an eol
show-downstream-deps-%:
	$(call SET_CLEAR,PKGS_VISITED)
	$(info $(call WALK_DOWNSTREAM,$*))
	@echo -n

show-upstream-deps-%:
	$(call SET_CLEAR,PKGS_VISITED)
	$(info $(call WALK_UPSTREAM,$*))
	@echo -n

.PHONY: clean
clean:
	rm -rf $(call TMP_DIR,*) $(PREFIX)/*

.PHONY: clean-pkg
clean-pkg:
	rm -f $(patsubst %,'%', \
                  $(filter-out \
                      $(foreach PKG,$(PKGS),$(PKG_DIR)/$($(PKG)_FILE)), \
                      $(wildcard $(PKG_DIR)/*)))

.PHONY: update
define UPDATE
    $(if $(2),
        $(if $(filter $($(1)_IGNORE),$(2)),
            $(info IGNORED  $(1)  $(2)),
            $(if $(filter $(2),$(shell printf '$($(1)_VERSION)\n$(2)' | $(SORT) -V | head -1)),
                $(if $(filter $(2),$($(1)_VERSION)),
                    $(info .        $(1)  $(2)),
                    $(info OLD      $(1)  $($(1)_VERSION) --> $(2) ignoring)),
                $(info NEW      $(1)  $($(1)_VERSION) --> $(2))
                $(SED) -i 's/^\([^ ]*_VERSION *:=\).*/\1 $(2)/' '$(TOP_DIR)/src/$(1).mk'
                $(MAKE) -f '$(MAKEFILE)' 'update-checksum-$(1)' \
                    || { $(SED) -i 's/^\([^ ]*_VERSION *:=\).*/\1 $($(1)_VERSION)/' '$(TOP_DIR)/src/$(1).mk'; \
                         exit 1; })),
        $(info Unable to update version number of package $(1) \
            $(newline)$(newline)$($(1)_UPDATE)$(newline)))

endef
update:
	$(foreach PKG,$(PKGS),$(call UPDATE,$(PKG),$(shell $($(PKG)_UPDATE))))

update-package-%:
	$(if $(findstring $*~,$(addsuffix ~,$(PKGS))), \
	     $(call UPDATE,$*,$(shell $($*_UPDATE))), \
	     $(error package $* not found in index.html))

update-checksum-%:
	$(if $(findstring $*~,$(addsuffix ~,$(PKGS))), \
		$(call DOWNLOAD_PKG_ARCHIVE,$*) && \
		$(SED) -i 's/^\([^ ]*_CHECKSUM *:=\).*/\1 '"`$(call PKG_CHECKSUM,$*)`"'/' '$(TOP_DIR)/src/$*.mk', \
	$(error package $* not found in index.html))

cleanup-style:
	@$(foreach FILE,$(wildcard $(addprefix $(TOP_DIR)/,Makefile index.html CNAME src/*.mk src/*test.* tools/*)),\
            $(SED) ' \
                s/\r//g; \
                s/[ \t]\+$$//; \
                s,^#!/bin/bash$$,#!/usr/bin/env bash,; \
                $(if $(filter %Makefile,$(FILE)),,\
                    s/\t/    /g; \
                ) \
            ' < $(FILE) > $(TOP_DIR)/tmp-cleanup-style; \
            diff -u $(FILE) $(TOP_DIR)/tmp-cleanup-style >/dev/null \
                || { echo '[cleanup] $(FILE)'; \
                     cp $(TOP_DIR)/tmp-cleanup-style $(FILE); }; \
            rm -f $(TOP_DIR)/tmp-cleanup-style; \
        )