# set this on the command line to get a WIN32 or a FINAL build
BUILD    := DEBUG


ifeq (${BUILD},WIN32)
    LIBGL   := -lopengl32 -lglu32
    LIBSDL  := `/usr/mingw32/bin/sdl-config --libs`
else
    LIBGL   := -lGL -lGLU
    LIBSDL  := `sdl-config --libs`
endif
LIBMY       := -lbear
LIBS        := ${LIBSDL} ${LIBGL} ${LIBMY}

OPTFLAGS := -O2
DBGFLAGS := -ggdb
PRFFLAGS := ${DBGFLAGS} -pg
MYFLAGS  := -Wall -pedantic -ansi

RPATH    := libs/

VALFLAGS := --leak-check=full
LNKFLAGS := -Wl,-rpath,${RPATH}

ifeq (${BUILD},WIN32)
    CXXFLAGS    := ${MYFLAGS} ${OPTFLAGS}
else
ifeq (${BUILD},FINAL)
    CXXFLAGS    := ${MYFLAGS} ${OPTFLAGS}
else
    CXXFLAGS    := ${MYFLAGS} ${DBGFLAGS}
endif
endif

ifeq (${BUILD},WIN32)
    CXX := mingw32-g++
else
    CXX := g++
endif

DIRS    := # := start

SRCSDIR := src/
SRCS    := # := start

ifeq (${BUILD},WIN32)
    OBJSDIR := objs-mingw32/
else
ifeq (${BUILD},FINAL)
    OBJSDIR := objs/
else
    OBJSDIR := objsd/
endif
endif
OBJS        := # := start

DEPSDIR := deps/
DEPS    := # := start

# include all of the dir.mk
DIRMK   := dir.mk
include ${SRCSDIR}${DIRMK}

ifeq (${BUILD},WIN32)
    WORKINGDIR  := bin-mingw32/
else
ifeq (${BUILD},FINAL)
    WORKINGDIR  := bin/
else
    WORKINGDIR  := bind/
endif
endif

CFGDIRNAME  := configs/
SRCCFGDIR   := ${CFGDIRNAME}
DSTCFGDIR   := ${WORKINGDIR}${CFGDIRNAME}

CFGS := # := start
CFGS += keys.cfg
CFGS := $(addprefix ${DSTCFGDIR},${CFGS})

LIBSDIRNAME := libs/
SRCLIBSDIR  := ${LIBSDIRNAME}
ifeq (${BUILD},WIN32)
    DSTLIBSDIR  := ${WORKINGDIR}
else
    DSTLIBSDIR  := ${WORKINGDIR}${LIBSDIRNAME}
endif

LIBSTXT     := # := start
LIBSTXT     += COPYING-SDL
LIBSTXT     += README-SDL
LIBSTXT     += VERSION-SDL
LIBSTXT     := $(addprefix ${DSTLIBSDIR},${LIBSTXT})

LIBSCPY     := # := start
ifeq (${BUILD},WIN32)
    LIBSCPY += SDL.dll
    LIBSCPY += bear.dll
else
    LIBSCPY += libSDL-1.2.so.0
    LIBSCPY += libbear.so.0
endif
LIBSCPY     := $(addprefix ${DSTLIBSDIR},${LIBSCPY})

SRCTXTDIR   :=
DSTTXTDIR   := ${WORKINGDIR}

TXT         := # := start
TXT         += COPYING
TXT         := $(addprefix ${DSTTXTDIR},${TXT})

ifeq (${BUILD},WIN32)
    TARGETNAME  := run_physics.exe
else
    TARGETNAME  := run_physics
endif
TARGETTMP   := ${OBJSDIR}${TARGETNAME}
TARGET      := ${WORKINGDIR}${TARGETNAME}

DEPSBLDDIRS := ${DEPSDIR} $(addprefix ${DEPSDIR},${DIRS})
OBJSBLDDIRS := ${OBJSDIR} $(addprefix ${OBJSDIR},${DIRS})

BLDDIRS     := # := start
BLDDIRS     += ${OBJSBLDDIRS}
BLDDIRS     += ${DEPSBLDDIRS}
BLDDIRS     += ${WORKINGDIR}
BLDDIRS     += ${DSTCFGDIR}
BLDDIRS     += ${DSTLIBSDIR}
BLDDIRS     := $(sort ${BLDDIRS}) # remove possible duplicates

INCDIRS     := ${SRCSDIR}
INCFLAGS    := $(addprefix -I, ${INCDIRS})


ifeq (${BUILD},WIN32)
    PRNTFMT := printf "%-12s: %s\n"
else
    PRNTFMT := printf "%-8s: %s\n"
endif

VERBOSE := 0

ifeq (${VERBOSE},0)
    # quiet the printf command
    Q1 := @
    # quiet the command that is `replaced' by an echo
    Q2 := @
else
    # EAT the printf command as if it was not there
    Q1 := @true # NOTE: the space between @true and the # is VERY important!!
    # do not quiet the command output
    Q2 :=
endif

.PHONY: all
all: ${TARGET} ${CFGS} ${LIBSTXT} ${LIBSCPY} ${TXT}

# cause the fancy $$ directory rules to work out
.SECONDEXPANSION:

# how to link the main target
${TARGETTMP}: ${OBJS}
	${Q1}${PRNTFMT} "${CXX}" "$@"
	${Q2}${CXX} ${CXXFLAGS} ${LNKFLAGS} -o $@ $^ ${LIBS}

# rule to copy tmp target to working directory
${TARGET}: ${TARGETTMP} | ${WORKINGDIR}
	${Q1}${PRNTFMT} "cp" "$@"
	${Q2}cp $< $@

# rule to copy the config files into the working directory
${DSTCFGDIR}%: ${SRCCFGDIR}% | $$(dir $$@)
	${Q1}${PRNTFMT} "cp" "$@"
	${Q2}cp $< $@

# rule to copy the library files into the working directory
${DSTLIBSDIR}%: ${SRCLIBSDIR}% | $$(dir $$@)
	${Q1}${PRNTFMT} "cp" "$@"
	${Q2}cp $< $@

# rule to copy the library files into the working directory
${DSTTXTDIR}%: ${SRCTXTDIR}% | $$(dir $$@)
	${Q1}${PRNTFMT} "cp" "$@"
	${Q2}cp $< $@

# how to make a directory
${BLDDIRS}:
	${Q1}${PRNTFMT} "mkdir" "$@"
	${Q2}mkdir -p $@

# rule to make an object file from a .cpp
${OBJSDIR}%.o: ${SRCSDIR}%.cpp | $$(dir $$@)
	${Q1}${PRNTFMT} "${CXX}" "$@"
	${Q2}${CXX} ${CXXFLAGS} -c -o $@ $< ${INCFLAGS}

# rule to make a depend file from a .cpp
#   be clever and escape the / chars in file paths
#   DON'T simply use another sed delimiter or it can't appear in the file paths
${DEPSDIR}%.d: ${SRCSDIR}%.cpp | $$(dir $$@)
	${Q1}${PRNTFMT} "DEP" "$@"
	${Q2}${CXX} -MM ${CXXFLAGS} $< ${INCFLAGS} | \
		sed 's/\(^.*\):/$(subst /,\/,${OBJSDIR}\1 $@):/' > $@

CLEANCMDS := cleanbin cleanobjs cleandeps clean cleanall

.PHONY: cleanbin
cleanbin:
	${Q1}${PRNTFMT} "rm" "${WORKINGDIR}"
	${Q2}rm -rf ${WORKINGDIR}

.PHONY: cleanobjs
cleanobjs:
	${Q1}${PRNTFMT} "rm" "${OBJSDIR}"
	${Q2}rm -rf ${OBJSDIR}

.PHONY: cleandeps
cleandeps:
	${Q1}${PRNTFMT} "rm" "${DEPSDIR}"
	${Q2}rm -rf ${DEPSDIR}

.PHONY: clean
clean: cleanobjs
	${Q1}${PRNTFMT} "rm" "${TARGET}"
	${Q2}rm -rf ${TARGET}

.PHONY: cleanall
cleanall: clean cleanbin cleandeps

.PHONY: gitclean
gitclean:
	${Q1}${PRNTFMT} "git clean" "showing; use gitcleanf to force removal"
	${Q2}git clean -nxd

.PHONY: gitcleanf
gitcleanf:
	${Q1}${PRNTFMT} "git clean" "forcing"
	${Q2}git clean -fxd

.PHONY: tar
tar: physics.tar.bz2

.PHONY: physics.tar.bz2
physics.tar.bz2:
	@${PRNTFMT} "git archive" "Warning, archives HEAD not current"
	${Q1}${PRNTFMT} "git archive" "physics.tar.bz2"
	${Q2}git archive --prefix=physics/ HEAD | bzip2 > physics.tar.bz2

.PHONY: run
run: all
ifeq (${WIN32},1)
	cd ${WORKINGDIR}; wine ${TARGETNAME}
else
	cd ${WORKINGDIR}; ./${TARGETNAME}
endif

.PHONY: gdb
gdb: all
	cd ${WORKINGDIR}; gdb ${TARGETNAME}

.PHONY: cgdb
cgdb: all
	cd ${WORKINGDIR}; cgdb ${TARGETNAME}

.PHONY: val
val: all
	cd ${WORKINGDIR}; valgrind ${VALFLAGS} ./${TARGETNAME}

.PHONY: prof
prof: run
	cd ${WORKINGDIR}; gprof -b ${TARGETNAME} > prof
	cd ${WORKINGDIR}; kprof -f prof


# Do not include deps files when doing a _single_ clean operation
ifeq ($(findstring ${MAKECMDGOALS},${CLEANCMDS}),)
    -include ${DEPS}
endif