%%%----------------------------------------------------------------------
%%% File    : rebar.config
%%% Author  : Mickael Remond <mremond@process-one.net>
%%% Purpose : Rebar build script. Compliant with rebar and rebar3.
%%% Created : 15 Dec 2015 by Mickael Remond <mremond@process-one.net>
%%%
%%% Copyright (C) 2002-2021 ProcessOne, SARL. All Rights Reserved.
%%%
%%% 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.
%%%
%%%----------------------------------------------------------------------
Cfg = case file:consult(filename:join([filename:dirname(SCRIPT),"vars.config"])) of
	  {ok, Terms} ->
	      Terms;
	  _Err ->
	      []
      end ++ [{cflags, "-g -O2 -Wall"}, {ldflags, ""}, {with_gcov, "false"}],
{cflags, CfgCFlags} = lists:keyfind(cflags, 1, Cfg),
{ldflags, CfgLDFlags} = lists:keyfind(ldflags, 1, Cfg),
{with_gcov, CfgWithGCov} = lists:keyfind(with_gcov, 1, Cfg),

SysVersion = lists:map(fun erlang:list_to_integer/1,
		       string:tokens(erlang:system_info(version), ".")),

IsRebar3 = case application:get_key(rebar, vsn) of
	       {ok, VSN} ->
		   [VSN1 | _] = string:tokens(VSN, "-"),
		   [Maj|_] = string:tokens(VSN1, "."),
		   (list_to_integer(Maj) >= 3);
	       undefined ->
		   lists:keymember(mix, 1, application:loaded_applications())
	   end,

ModCfg0 = fun(F, Cfg, [Key|Tail], Op, Default) ->
		  {OldVal,PartCfg} = case lists:keytake(Key, 1, Cfg) of
					 {value, {_, V1}, V2} -> {V1, V2};
					 false -> {if Tail == [] -> Default; true -> [] end, Cfg}
				     end,
		  case Tail of
		      [] ->
			  [{Key, Op(OldVal)} | PartCfg];
		      _ ->
			  [{Key, F(F, OldVal, Tail, Op, Default)} | PartCfg]
		  end
	  end,
	ModCfg = fun(Cfg, Keys, Op, Default) -> ModCfg0(ModCfg0, Cfg, Keys, Op,
		  Default) end,

	ModCfgS = fun(Cfg, Keys, Val) -> ModCfg0(ModCfg0, Cfg, Keys, fun(_V) ->
		  Val end, "") end,


FilterConfig = fun(F, Cfg, [{Path, true, ModFun, Default} | Tail]) ->
		       F(F, ModCfg0(ModCfg0, Cfg, Path, ModFun, Default), Tail);
		  (F, Cfg, [_ | Tail]) ->
		       F(F, Cfg, Tail);
		  (F, Cfg, []) ->
		       Cfg
	       end,

AppendStr = fun(Append) ->
		    fun("") ->
			    Append;
		       (Val) ->
			    Val ++ " " ++ Append
		    end
	    end,
AppendList = fun(Append) ->
		     fun(Val) ->
			     Val ++ Append
		     end
	     end,

Rebar3DepsFilter = fun(DepsList) ->
			   lists:map(fun({DepName,_, {git,_, {tag,Version}}}) ->
					     {DepName, Version};
					(Dep) ->
					     Dep
				     end, DepsList)
		   end,

GlobalDepsFilter = fun(Deps) ->
			   DepNames = lists:map(fun({DepName, _, _}) -> DepName;
						   ({DepName, _}) -> DepName
						   end, Deps),
			   lists:filtermap(fun(Dep) ->
						 case code:lib_dir(Dep) of
						     {error, _} ->
							 {true,"Unable to locate dep '"++atom_to_list(Dep)++"' in system deps."};
						     _ ->
							 false
						 end
					 end, DepNames)
		   end,

GithubConfig = case {os:getenv("GITHUB_ACTIONS"), os:getenv("GITHUB_TOKEN")} of
  {"true", Token} when is_list(Token) ->
    CONFIG1 = [{coveralls_repo_token, Token},
               {coveralls_service_job_id, os:getenv("GITHUB_RUN_ID")},
               {coveralls_commit_sha, os:getenv("GITHUB_SHA")},
               {coveralls_service_number, os:getenv("GITHUB_RUN_NUMBER")}],
    case os:getenv("GITHUB_EVENT_NAME") =:= "pull_request"
        andalso string:tokens(os:getenv("GITHUB_REF"), "/") of
        [_, "pull", PRNO, _] ->
            [{coveralls_service_pull_request, PRNO} | CONFIG1];
        _ ->
            CONFIG1
    end;
  _ ->
    []
end,

Rules = [
	 {[port_env, "CFLAGS"], SysVersion >= [7, 3],
	  AppendStr("-DHAS_ERTS_EXIT"), "$CFLAGS"},
	 {[port_env, "CFLAGS"], true,
	  AppendStr(CfgCFlags), "$CFLAGS"},
	 {[port_env, "LDFLAGS"], true,
	  AppendStr(CfgLDFlags), "$LDFLAGS"},
	 {[post_hooks], (not IsRebar3) and (CfgWithGCov == "true"),
	  AppendList([{eunit, "gcov -o c_src sqlite3_drv"},
		      {eunit, "mv *.gcov .eunit/"}]), []},
	 {[post_hooks], IsRebar3 and (CfgWithGCov == "true"),
	  AppendList([{eunit, "gcov -o c_src sqlite3_drv"},
		      {eunit, "mv *.gcov _build/test/cover/"}]), []},
	 {[port_env, "LDFLAGS"], CfgWithGCov == "true",
	  AppendStr("--coverage"), ""},
	 {[port_env, "CFLAGS"], CfgWithGCov == "true",
	  AppendStr("--coverage"), ""},
	 {[deps], IsRebar3,
	  Rebar3DepsFilter, []},
	 {[plugins], IsRebar3,
	  AppendList([pc]), []},
	 {[provider_hooks], IsRebar3,
	  AppendList([{pre, [
			     {compile, {pc, compile}},
			     {clean, {pc, clean}}
			    ]}]), []},
	 {[plugins], os:getenv("COVERALLS") == "true",
	  AppendList([{coveralls, {git,
	                           "https://github.com/processone/coveralls-erl.git",
	                           {branch, "addjsonfile"}}} ]), []},
	 {[deps], os:getenv("USE_GLOBAL_DEPS") /= false,
	  GlobalDepsFilter, []}
	],


Config = FilterConfig(FilterConfig, CONFIG, Rules) ++ GithubConfig,

%io:format("Rules:~n~p~n~nCONFIG:~n~p~n~nConfig:~n~p~n", [Rules, CONFIG, Config]),

Config.

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