-module(rebar_file_utils_SUITE).

-export([all/0,
         groups/0,
         init_per_group/2,
         end_per_group/2,
         raw_tmpdir/1,
         empty_tmpdir/1,
         simple_tmpdir/1,
         multi_tmpdir/1,
         reset_nonexistent_dir/1,
         reset_empty_dir/1,
         reset_dir/1,
         path_from_ancestor/1,
         canonical_path/1,
         resolve_link/1,
         split_dirname/1]).

-include_lib("common_test/include/ct.hrl").
-include_lib("eunit/include/eunit.hrl").
-include_lib("kernel/include/file.hrl").


all() ->
    [{group, tmpdir},
     {group, reset_dir},
     canonical_path,
     resolve_link,
     split_dirname].

groups() ->
    [{tmpdir, [], [raw_tmpdir, empty_tmpdir, simple_tmpdir, multi_tmpdir]},
     {reset_dir, [], [reset_nonexistent_dir, reset_empty_dir, reset_dir]}].

init_per_group(reset_dir, Config) ->
    TmpDir = rebar_file_utils:system_tmpdir(["rebar_file_utils_SUITE", "resetable"]),
    [{tmpdir, TmpDir}|Config];
init_per_group(_, Config) -> Config.
end_per_group(_, Config) -> Config.

raw_tmpdir(_Config) ->
    case rebar_file_utils:system_tmpdir() of
        "/tmp"  -> ok;
        "./tmp" -> ok
    end.

empty_tmpdir(_Config) ->
    case rebar_file_utils:system_tmpdir([]) of
        "/tmp"  -> ok;
        "./tmp" -> ok
    end.

simple_tmpdir(_Config) ->
    case rebar_file_utils:system_tmpdir(["test"]) of
        "/tmp/test"  -> ok;
        "./tmp/test" -> ok
    end.

multi_tmpdir(_Config) ->
    case rebar_file_utils:system_tmpdir(["a", "b", "c"]) of
        "/tmp/a/b/c"  -> ok;
        "./tmp/a/b/c" -> ok
    end.

reset_nonexistent_dir(Config) ->
    TmpDir = ?config(tmpdir, Config),
    _ = ec_file:remove(TmpDir, [recursive]),
    ?assertNot(filelib:is_dir(TmpDir)),
    ok = rebar_file_utils:reset_dir(TmpDir),
    ?assert(filelib:is_dir(TmpDir)),
    {ok, []} = rebar_utils:list_dir(TmpDir).

reset_empty_dir(Config) ->
    TmpDir = ?config(tmpdir, Config),
    _ = ec_file:remove(TmpDir, [recursive]),
    _ = filelib:ensure_dir(filename:join([TmpDir, "dummy.beam"])),
    ?assert(filelib:is_dir(TmpDir)),
    ok = rebar_file_utils:reset_dir(TmpDir),
    ?assert(filelib:is_dir(TmpDir)),
    {ok, []} = rebar_utils:list_dir(TmpDir).

reset_dir(Config) ->
    TmpDir = ?config(tmpdir, Config),
    _ = ec_file:remove(TmpDir, [recursive]),
    _ = filelib:ensure_dir(filename:join([TmpDir, "dummy.beam"])),
    ?assert(filelib:is_dir(TmpDir)),
    lists:foreach(fun(Name) -> file:write_file(filename:join([TmpDir, Name]), <<>>) end,
                  ["a", "b", "c"]),
    lists:foreach(fun(File) -> ?assert(filelib:is_file(filename:join([TmpDir, File]))) end,
                  ["a", "b", "c"]),
    ok = rebar_file_utils:reset_dir(TmpDir),
    ?assert(filelib:is_dir(TmpDir)),
    {ok, []} = rebar_utils:list_dir(TmpDir).

path_from_ancestor(_Config) ->
    ?assertEqual({ok, "foo/bar/baz"}, rebar_file_utils:path_from_ancestor("/foo/bar/baz", "/")),
    ?assertEqual({ok, "bar/baz"}, rebar_file_utils:path_from_ancestor("/foo/bar/baz", "/foo")),
    ?assertEqual({ok, "bar"}, rebar_file_utils:path_from_ancestor("foo/bar", "foo")),
    ?assertEqual({ok, "bar"}, rebar_file_utils:path_from_ancestor("foo/bar/", "foo/")),
    ?assertEqual({error, badparent}, rebar_file_utils:path_from_ancestor("/foo/bar/baz", "/qux")),
    ?assertEqual({error, badparent}, rebar_file_utils:path_from_ancestor("/foo/bar/baz", "/foo/bar/baz/qux")).

canonical_path(_Config) ->
    %% We find the root so that the name works both on unix-likes and
    %% with Windows.
    Root = case os:type() of
               {win32, _} -> filename:nativename(filename:absname("/")); % C:\, with proper drive
               _ -> "/"
           end,
    ?assertEqual(filename:nativename(Root), rebar_file_utils:canonical_path("/")),
    ?assertEqual(filename:nativename(Root), rebar_file_utils:canonical_path("/../../..")),
    ?assertEqual(Root ++ "foo", rebar_file_utils:canonical_path("/foo/bar/..")),
    ?assertEqual(Root ++ "foo", rebar_file_utils:canonical_path("/foo/../foo")),
    ?assertEqual(Root ++ "foo", rebar_file_utils:canonical_path("/foo/.")),
    ?assertEqual(Root ++ "foo", rebar_file_utils:canonical_path("/foo/./.")),
    ?assertEqual(filename:nativename(Root ++ "foo/bar"),
                 rebar_file_utils:canonical_path("/foo/./bar")).

resolve_link(_Config) ->
    TmpDir = rebar_file_utils:system_tmpdir(
            ["rebar_file_utils_SUITE", "resolve_link"]),
    Link = filename:join(TmpDir, "link"),
    Target = filename:join(TmpDir, "link-target"),
    ec_file:remove(TmpDir, [recursive]),
    ok = filelib:ensure_dir(Target),
    ok = file:write_file(Target, <<>>),
    ok = file:make_symlink(Target, Link),
    ?assertEqual(Target, rebar_file_utils:resolve_link(Link)).

split_dirname(_Config) ->
    ?assertEqual({".", ""}, rebar_file_utils:split_dirname("")),
    ?assertEqual({"/", ""}, rebar_file_utils:split_dirname("/")),
    ?assertEqual({"/", "foo"}, rebar_file_utils:split_dirname("/foo")),
    ?assertEqual({".", "foo"}, rebar_file_utils:split_dirname("foo")),
    ?assertEqual({"/foo", "bar"}, rebar_file_utils:split_dirname("/foo/bar")),
    ?assertEqual({"foo", "bar"}, rebar_file_utils:split_dirname("foo/bar")).