-module(ezic_rule_tests).
-include("include/ezic.hrl").
-include_lib("eunit/include/eunit.hrl").


project_next_test_() ->
    [
     
     % simple UTC example
     ?_assertEqual({2010, {{2010,11,10},{16,20,0}}}, 
		   ezic_rule:project_next(
		     #rule{from=1984, to=2032, in=11, on=10, at=#tztime{time={16,20,0}, flag=u}}
		     , {-5,0,0}, {-1,0,0}, {{2010,11,10},{0,0,0}}
		    ))

     % skip a year UTC example
     , ?_assertEqual({2011, {{2011,11,10},{16,20,0}}}, 
		   ezic_rule:project_next(
		     #rule{from=1984, to=2032, in=11, on=10, at=#tztime{time={16,20,0}, flag=u}}
		     , {-5,0,0}, {-1,0,0}, {{2010,11,10},{16,21,0}}
		    ))

     % skip 3 years UTC example
     , ?_assertEqual({2013, {{2013,11,10},{16,20,0}}}, 
		   ezic_rule:project_next(
		     #rule{from=1984, to=2032, in=11, on=10, at=#tztime{time={16,20,0}, flag=u}}
		     , {-5,0,0}, {-1,0,0}, {{2012,11,11},{16,20,0}}
		    ))

     % no solution
     , ?_assertEqual(none, 
		   ezic_rule:project_next(
		     #rule{from=1984, to=2010, in=11, on=10, at=#tztime{time={16,20,0}, flag=u}}
		     , {-5,0,0}, {-1,0,0}, {{2012,11,11},{16,20,0}}
		    ))


     % wacky UTC/DST mismatch example for Africa/Tripoli
     , ?_assertEqual({1952, {{1951,12,31},{22,0,0}}},
		     ezic_rule:project_next(
		       #rule{from=1952, to=only, in=1, on=1, at=#tztime{}, save={0,0,0}}
		       , {1,0,0}, {1,0,0}, {{1951,10,14},{3,0,0}}
		      ))
    ].