-module(relsync_cli).

-export([
    do/3,
    opts/0
]).

do(Name, Options, _Config) ->
    Help = proplists:is_defined(help, Options),
    Ssh = proplists:is_defined(ssh, Options),
    Erl = proplists:is_defined(erl, Options),
    case {Help, Ssh, Erl} of
        {true, _, _} ->
            getopt:usage(relsync_cli:opts(), Name),
            erlang:halt(0);
        {_, true, true} ->
            io:put_chars(standard_error, ["either erl or ssh should provided\n\n"]),
            getopt:usage(relsync_cli:opts(), Name),
            erlang:halt(2);
        {false, true, _} ->
            ok = relsync:update_nodes(ssh, Options);
        {false, _, true} ->
            target_syncer_sup:start_link(),
            ok = relsync:setup_local_node(Options),
            ok = relsync:update_nodes(erl, Options);
        _ -> 
            io:put_chars(standard_error, ["invalid options\n\n"]),
            getopt:usage(relsync_cli:opts(), Name),
            erlang:halt(2)
    end.

-spec opts() -> [getopt:option_spec()].
opts() ->
    [
        %% {Name,     ShortOpt, LongOpt,                ArgSpec,                HelpMsg}
        {destnode, $d, "destination-node", {string, "node@other"}, "Destination node"},
        {destpath, $p, "destination-path", {string, "/srv/erlang"},
            "Path to release on the destination (Can be on a read-only filesystem)"},
        {destrwpath, $q, "destination-rw-path", {string, ""},
            "Path to writable location on the destination (empty if not needed)"},
        {localpath, $l, "local-path", {string, "./_rel"}, "Path to local release"},
        {hooks, $H, "hooks", string, "Erlang module containing hooks to run on the destination"},
        {cookie, $c, "cookie", {string, "cookie"}, "Erlang magic cookie to use"},
        {sname, $s, "sname", string, "Short name for the local node"},
        {name, $n, "name", string, "Long name for the local node"},

        {ssh, $S, "ssh", undefined, "Syncronize release over ssh"},
        {port, $P, "port", integer, "ssh port to use"},
        {user, $u, "user", string, "ssh username"},

        {help, $h, "help", undefined, "Show help usage"}
    ].