# Copyright (c) 2013-2016, Loïc Hoguin <essen@ninenines.eu>
# This file is part of erlang.mk and subject to the terms of the ISC License.

.PHONY: clean-app

# Configuration.

ERLC_OPTS ?= -Werror +debug_info +warn_export_vars +warn_shadow_vars \
	+warn_obsolete_guard # +bin_opt_info +warn_export_all +warn_missing_spec
COMPILE_FIRST ?=
COMPILE_FIRST_PATHS = $(addprefix src/,$(addsuffix .erl,$(COMPILE_FIRST)))
ERLC_EXCLUDE ?=
ERLC_EXCLUDE_PATHS = $(addprefix src/,$(addsuffix .erl,$(ERLC_EXCLUDE)))

ERLC_ASN1_OPTS ?=

ERLC_MIB_OPTS ?=
COMPILE_MIB_FIRST ?=
COMPILE_MIB_FIRST_PATHS = $(addprefix mibs/,$(addsuffix .mib,$(COMPILE_MIB_FIRST)))

# Verbosity.

app_verbose_0 = @echo " APP   " $(PROJECT);
app_verbose_2 = set -x;
app_verbose = $(app_verbose_$(V))

appsrc_verbose_0 = @echo " APP   " $(PROJECT).app.src;
appsrc_verbose_2 = set -x;
appsrc_verbose = $(appsrc_verbose_$(V))

makedep_verbose_0 = @echo " DEPEND" $(PROJECT).d;
makedep_verbose_2 = set -x;
makedep_verbose = $(makedep_verbose_$(V))

erlc_verbose_0 = @echo " ERLC  " $(filter-out $(patsubst %,%.erl,$(ERLC_EXCLUDE)),\
	$(filter %.erl %.core,$(?F)));
erlc_verbose_2 = set -x;
erlc_verbose = $(erlc_verbose_$(V))

xyrl_verbose_0 = @echo " XYRL  " $(filter %.xrl %.yrl,$(?F));
xyrl_verbose_2 = set -x;
xyrl_verbose = $(xyrl_verbose_$(V))

asn1_verbose_0 = @echo " ASN1  " $(filter %.asn1,$(?F));
asn1_verbose_2 = set -x;
asn1_verbose = $(asn1_verbose_$(V))

mib_verbose_0 = @echo " MIB   " $(filter %.bin %.mib,$(?F));
mib_verbose_2 = set -x;
mib_verbose = $(mib_verbose_$(V))

ifneq ($(wildcard src/),)

# Targets.

app:: $(if $(wildcard ebin/test),clean) deps
	$(verbose) $(MAKE) --no-print-directory $(PROJECT).d
	$(verbose) $(MAKE) --no-print-directory app-build

ifeq ($(wildcard src/$(PROJECT_MOD).erl),)
define app_file
{application, '$(PROJECT)', [
	{description, "$(PROJECT_DESCRIPTION)"},
	{vsn, "$(PROJECT_VERSION)"},$(if $(IS_DEP),
	{id$(comma)$(space)"$(1)"}$(comma))
	{modules, [$(call comma_list,$(2))]},
	{registered, []},
	{applications, [$(call comma_list,kernel stdlib $(OTP_DEPS) $(LOCAL_DEPS) $(OPTIONAL_DEPS) $(foreach dep,$(DEPS),$(call dep_name,$(dep))))]},
	{optional_applications, [$(call comma_list,$(OPTIONAL_DEPS))]},
	{env, $(subst \,\\,$(PROJECT_ENV))}$(if $(findstring {,$(PROJECT_APP_EXTRA_KEYS)),$(comma)$(newline)$(tab)$(subst \,\\,$(PROJECT_APP_EXTRA_KEYS)),)
]}.
endef
else
define app_file
{application, '$(PROJECT)', [
	{description, "$(PROJECT_DESCRIPTION)"},
	{vsn, "$(PROJECT_VERSION)"},$(if $(IS_DEP),
	{id$(comma)$(space)"$(1)"}$(comma))
	{modules, [$(call comma_list,$(2))]},
	{registered, [$(call comma_list,$(PROJECT)_sup $(PROJECT_REGISTERED))]},
	{applications, [$(call comma_list,kernel stdlib $(OTP_DEPS) $(LOCAL_DEPS) $(OPTIONAL_DEPS) $(foreach dep,$(DEPS),$(call dep_name,$(dep))))]},
	{optional_applications, [$(call comma_list,$(OPTIONAL_DEPS))]},
	{mod, {$(PROJECT_MOD), []}},
	{env, $(subst \,\\,$(PROJECT_ENV))}$(if $(findstring {,$(PROJECT_APP_EXTRA_KEYS)),$(comma)$(newline)$(tab)$(subst \,\\,$(PROJECT_APP_EXTRA_KEYS)),)
]}.
endef
endif

app-build: ebin/$(PROJECT).app
	$(verbose) :

# Source files.

ALL_SRC_FILES := $(sort $(call core_find,src/,*))

ERL_FILES := $(filter %.erl,$(ALL_SRC_FILES))
CORE_FILES := $(filter %.core,$(ALL_SRC_FILES))

# ASN.1 files.

ifneq ($(wildcard asn1/),)
ASN1_FILES = $(sort $(call core_find,asn1/,*.asn1))
ERL_FILES += $(addprefix src/,$(patsubst %.asn1,%.erl,$(notdir $(ASN1_FILES))))

define compile_asn1
	$(verbose) mkdir -p include/
	$(asn1_verbose) erlc -v -I include/ -o asn1/ +noobj $(ERLC_ASN1_OPTS) $(1)
	$(verbose) mv asn1/*.erl src/
	-$(verbose) mv asn1/*.hrl include/
	$(verbose) mv asn1/*.asn1db include/
endef

$(PROJECT).d:: $(ASN1_FILES)
	$(if $(strip $?),$(call compile_asn1,$?))
endif

# SNMP MIB files.

ifneq ($(wildcard mibs/),)
MIB_FILES = $(sort $(call core_find,mibs/,*.mib))

$(PROJECT).d:: $(COMPILE_MIB_FIRST_PATHS) $(MIB_FILES)
	$(verbose) mkdir -p include/ priv/mibs/
	$(mib_verbose) erlc -v $(ERLC_MIB_OPTS) -o priv/mibs/ -I priv/mibs/ $?
	$(mib_verbose) erlc -o include/ -- $(addprefix priv/mibs/,$(patsubst %.mib,%.bin,$(notdir $?)))
endif

# Leex and Yecc files.

XRL_FILES := $(filter %.xrl,$(ALL_SRC_FILES))
XRL_ERL_FILES = $(addprefix src/,$(patsubst %.xrl,%.erl,$(notdir $(XRL_FILES))))
ERL_FILES += $(XRL_ERL_FILES)

YRL_FILES := $(filter %.yrl,$(ALL_SRC_FILES))
YRL_ERL_FILES = $(addprefix src/,$(patsubst %.yrl,%.erl,$(notdir $(YRL_FILES))))
ERL_FILES += $(YRL_ERL_FILES)

$(PROJECT).d:: $(XRL_FILES) $(YRL_FILES)
	$(if $(strip $?),$(xyrl_verbose) erlc -v -o src/ $(YRL_ERLC_OPTS) $?)

# Erlang and Core Erlang files.

define makedep.erl
	E = ets:new(makedep, [bag]),
	G = digraph:new([acyclic]),
	ErlFiles = lists:usort(string:tokens("$(ERL_FILES)", " ")),
	DepsDir = "$(call core_native_path,$(DEPS_DIR))",
	AppsDir = "$(call core_native_path,$(APPS_DIR))",
	DepsDirsSrc = "$(if $(wildcard $(DEPS_DIR)/*/src), $(call core_native_path,$(wildcard $(DEPS_DIR)/*/src)))",
	DepsDirsInc = "$(if $(wildcard $(DEPS_DIR)/*/include), $(call core_native_path,$(wildcard $(DEPS_DIR)/*/include)))",
	AppsDirsSrc = "$(if $(wildcard $(APPS_DIR)/*/src), $(call core_native_path,$(wildcard $(APPS_DIR)/*/src)))",
	AppsDirsInc = "$(if $(wildcard $(APPS_DIR)/*/include), $(call core_native_path,$(wildcard $(APPS_DIR)/*/include)))",
	DepsDirs = lists:usort(string:tokens(DepsDirsSrc++DepsDirsInc, " ")),
	AppsDirs = lists:usort(string:tokens(AppsDirsSrc++AppsDirsInc, " ")),
	Modules = [{list_to_atom(filename:basename(F, ".erl")), F} || F <- ErlFiles],
	Add = fun (Mod, Dep) ->
		case lists:keyfind(Dep, 1, Modules) of
			false -> ok;
			{_, DepFile} ->
				{_, ModFile} = lists:keyfind(Mod, 1, Modules),
				ets:insert(E, {ModFile, DepFile}),
				digraph:add_vertex(G, Mod),
				digraph:add_vertex(G, Dep),
				digraph:add_edge(G, Mod, Dep)
		end
	end,
	AddHd = fun (F, Mod, DepFile) ->
		case file:open(DepFile, [read]) of
			{error, enoent} ->
				ok;
			{ok, Fd} ->
				{_, ModFile} = lists:keyfind(Mod, 1, Modules),
				case ets:match(E, {ModFile, DepFile}) of
					[] ->
						ets:insert(E, {ModFile, DepFile}),
						F(F, Fd, Mod,0);
					_ -> ok
				end
		end
	end,
	SearchHrl = fun
		F(_Hrl, []) -> {error,enoent};
		F(Hrl, [Dir|Dirs]) ->
			HrlF = filename:join([Dir,Hrl]),
			case filelib:is_file(HrlF) of
				true  ->
				{ok, HrlF};
				false -> F(Hrl,Dirs)
			end
	end,
	Attr = fun
		(_F, Mod, behavior, Dep) ->
			Add(Mod, Dep);
		(_F, Mod, behaviour, Dep) ->
			Add(Mod, Dep);
		(_F, Mod, compile, {parse_transform, Dep}) ->
			Add(Mod, Dep);
		(_F, Mod, compile, Opts) when is_list(Opts) ->
			case proplists:get_value(parse_transform, Opts) of
				undefined -> ok;
				Dep -> Add(Mod, Dep)
			end;
		(F, Mod, include, Hrl) ->
			case SearchHrl(Hrl, ["src", "include",AppsDir,DepsDir]++AppsDirs++DepsDirs) of
				{ok, FoundHrl} -> AddHd(F, Mod, FoundHrl);
				{error, _} -> false
			end;
		(F, Mod, include_lib, Hrl) ->
			case SearchHrl(Hrl, ["src", "include",AppsDir,DepsDir]++AppsDirs++DepsDirs) of
				{ok, FoundHrl} -> AddHd(F, Mod, FoundHrl);
				{error, _} -> false
			end;
		(F, Mod, import, {Imp, _}) ->
			IsFile =
				case lists:keyfind(Imp, 1, Modules) of
					false -> false;
					{_, FilePath} -> filelib:is_file(FilePath)
				end,
			case IsFile of
				false -> ok;
				true -> Add(Mod, Imp)
			end;
		(_, _, _, _) -> ok
	end,
	MakeDepend = fun
		(F, Fd, Mod, StartLocation) ->
			case io:parse_erl_form(Fd, undefined, StartLocation) of
				{ok, AbsData, EndLocation} ->
					case AbsData of
						{attribute, _, Key, Value} ->
							Attr(F, Mod, Key, Value),
							F(F, Fd, Mod, EndLocation);
						_ -> F(F, Fd, Mod, EndLocation)
					end;
				{eof, _ } -> file:close(Fd);
				{error, ErrorDescription } ->
					file:close(Fd);
				{error, ErrorInfo, ErrorLocation} ->
					F(F, Fd, Mod, ErrorLocation)
			end,
			ok
	end,
	[begin
		Mod = list_to_atom(filename:basename(F, ".erl")),
		case file:open(F, [read]) of
			{ok, Fd} -> MakeDepend(MakeDepend, Fd, Mod,0);
			{error, enoent} -> ok
		end
	end || F <- ErlFiles],
	Depend = sofs:to_external(sofs:relation_to_family(sofs:relation(ets:tab2list(E)))),
	CompileFirst = [X || X <- lists:reverse(digraph_utils:topsort(G)), [] =/= digraph:in_neighbours(G, X)],
	TargetPath = fun(Target) ->
		case lists:keyfind(Target, 1, Modules) of
			false -> "";
			{_, DepFile} ->
				DirSubname = tl(string:tokens(filename:dirname(DepFile), "/")),
				string:join(DirSubname ++ [atom_to_list(Target)], "/")
		end
	end,
	Output0 = [
		"# Generated by Erlang.mk. Edit at your own risk!\n\n",
		[[F, "::", [[" ", D] || D <- Deps], "; @touch \$$@\n"] || {F, Deps} <- Depend],
		"\nCOMPILE_FIRST +=", [[" ", TargetPath(CF)] || CF <- CompileFirst], "\n"
	],
	Output = case "é" of
		[233] -> unicode:characters_to_binary(Output0);
		_ -> Output0
	end,
	ok = file:write_file("$(1)", Output),
	halt()
endef

ifeq ($(if $(NO_MAKEDEP),$(wildcard $(PROJECT).d),),)
$(PROJECT).d:: $(ERL_FILES) $(call core_find,include/,*.hrl) $(MAKEFILE_LIST)
	$(makedep_verbose) $(call erlang,$(call makedep.erl,$@))
endif

ifeq ($(IS_APP)$(IS_DEP),)
ifneq ($(words $(ERL_FILES) $(CORE_FILES) $(ASN1_FILES) $(MIB_FILES) $(XRL_FILES) $(YRL_FILES)),0)
# Rebuild everything when the Makefile changes.
$(ERLANG_MK_TMP)/last-makefile-change: $(MAKEFILE_LIST) | $(ERLANG_MK_TMP)
	$(verbose) if test -f $@; then \
		touch $(ERL_FILES) $(CORE_FILES) $(ASN1_FILES) $(MIB_FILES) $(XRL_FILES) $(YRL_FILES); \
		touch -c $(PROJECT).d; \
	fi
	$(verbose) touch $@

$(ERL_FILES) $(CORE_FILES) $(ASN1_FILES) $(MIB_FILES) $(XRL_FILES) $(YRL_FILES):: $(ERLANG_MK_TMP)/last-makefile-change
ebin/$(PROJECT).app:: $(ERLANG_MK_TMP)/last-makefile-change
endif
endif

$(PROJECT).d::
	$(verbose) :

include $(wildcard $(PROJECT).d)

ebin/$(PROJECT).app:: ebin/

ebin/:
	$(verbose) mkdir -p ebin/

define compile_erl
	$(erlc_verbose) erlc -v $(if $(IS_DEP),$(filter-out -Werror,$(ERLC_OPTS)),$(ERLC_OPTS)) -o ebin/ \
		-pa ebin/ -I include/ $(filter-out $(ERLC_EXCLUDE_PATHS),$(COMPILE_FIRST_PATHS) $(1))
endef

define validate_app_file
	case file:consult("ebin/$(PROJECT).app") of
		{ok, _} -> halt();
		_ -> halt(1)
	end
endef

ebin/$(PROJECT).app:: $(ERL_FILES) $(CORE_FILES) $(wildcard src/$(PROJECT).app.src)
	$(eval FILES_TO_COMPILE := $(filter-out src/$(PROJECT).app.src,$?))
	$(if $(strip $(FILES_TO_COMPILE)),$(call compile_erl,$(FILES_TO_COMPILE)))
# Older git versions do not have the --first-parent flag. Do without in that case.
	$(eval GITDESCRIBE := $(shell git describe --dirty --abbrev=7 --tags --always --first-parent 2>/dev/null \
		|| git describe --dirty --abbrev=7 --tags --always 2>/dev/null || true))
	$(eval MODULES := $(patsubst %,'%',$(sort $(notdir $(basename \
		$(filter-out $(ERLC_EXCLUDE_PATHS),$(ERL_FILES) $(CORE_FILES) $(BEAM_FILES)))))))
ifeq ($(wildcard src/$(PROJECT).app.src),)
	$(app_verbose) printf '$(subst %,%%,$(subst $(newline),\n,$(subst ','\'',$(call app_file,$(GITDESCRIBE),$(MODULES)))))' \
		> ebin/$(PROJECT).app
	$(verbose) if ! $(call erlang,$(call validate_app_file)); then \
		echo "The .app file produced is invalid. Please verify the value of PROJECT_ENV." >&2; \
		exit 1; \
	fi
else
	$(verbose) if [ -z "$$(grep -e '^[^%]*{\s*modules\s*,' src/$(PROJECT).app.src)" ]; then \
		echo "Empty modules entry not found in $(PROJECT).app.src. Please consult the erlang.mk documentation for instructions." >&2; \
		exit 1; \
	fi
	$(appsrc_verbose) cat src/$(PROJECT).app.src \
		| sed "s/{[[:space:]]*modules[[:space:]]*,[[:space:]]*\[\]}/{modules, \[$(call comma_list,$(MODULES))\]}/" \
		| sed "s/{id,[[:space:]]*\"git\"}/{id, \"$(subst /,\/,$(GITDESCRIBE))\"}/" \
		> ebin/$(PROJECT).app
endif
ifneq ($(wildcard src/$(PROJECT).appup),)
	$(verbose) cp src/$(PROJECT).appup ebin/
endif

clean:: clean-app

clean-app:
	$(gen_verbose) rm -rf $(PROJECT).d ebin/ priv/mibs/ $(XRL_ERL_FILES) $(YRL_ERL_FILES) \
		$(addprefix include/,$(patsubst %.mib,%.hrl,$(notdir $(MIB_FILES)))) \
		$(addprefix include/,$(patsubst %.asn1,%.hrl,$(notdir $(ASN1_FILES)))) \
		$(addprefix include/,$(patsubst %.asn1,%.asn1db,$(notdir $(ASN1_FILES)))) \
		$(addprefix src/,$(patsubst %.asn1,%.erl,$(notdir $(ASN1_FILES))))

endif