import { Clock } from "./clock";

describe("Clock", () => {
  describe("Creating a new clock with an initial time", () => {
    it("on the hour", () => {
      expect(new Clock(8).toString()).toEqual("08:00");
    });

    it("past the hour", () => {
      expect(new Clock(11, 9).toString()).toEqual("11:09");
    });

    it("midnight is zero hours", () => {
      expect(new Clock(24, 0).toString()).toEqual("00:00");
    });

    it("hour rolls over", () => {
      expect(new Clock(25, 0).toString()).toEqual("01:00");
    });

    it("hour rolls over continuously", () => {
      expect(new Clock(100, 0).toString()).toEqual("04:00");
    });

    it("sixty minutes is next hour", () => {
      expect(new Clock(1, 60).toString()).toEqual("02:00");
    });

    it("minutes roll over", () => {
      expect(new Clock(0, 160).toString()).toEqual("02:40");
    });

    it("minutes roll over continuously", () => {
      expect(new Clock(0, 1723).toString()).toEqual("04:43");
    });

    it("hour and minutes roll over", () => {
      expect(new Clock(25, 160).toString()).toEqual("03:40");
    });

    it("hour and minutes roll over continuously", () => {
      expect(new Clock(201, 3001).toString()).toEqual("11:01");
    });

    it("hour and minutes roll over to exactly midnight", () => {
      expect(new Clock(72, 8640).toString()).toEqual("00:00");
    });

    it("negative hour", () => {
      expect(new Clock(-1, 15).toString()).toEqual("23:15");
    });

    it("negative hour rolls over", () => {
      expect(new Clock(-25, 0).toString()).toEqual("23:00");
    });

    it("negative hour rolls over continuously", () => {
      expect(new Clock(-91, 0).toString()).toEqual("05:00");
    });

    it("negative minutes", () => {
      expect(new Clock(1, -40).toString()).toEqual("00:20");
    });

    it("negative minutes rolls over", () => {
      expect(new Clock(1, -160).toString()).toEqual("22:20");
    });

    it("negative minutes rolls over continuously", () => {
      expect(new Clock(1, -4820).toString()).toEqual("16:40");
    });

    it("negative hour and minutes both roll over", () => {
      expect(new Clock(-25, -160).toString()).toEqual("20:20");
    });

    it("negative hour and minutes both roll over continuously", () => {
      expect(new Clock(-121, -5810).toString()).toEqual("22:10");
    });

    describe("Adding and subtracting minutes", () => {
      it("add minutes", () => {
        expect(new Clock(10, 0).plus(3).toString()).toEqual("10:03");
      });

      it("add no minutes", () => {
        expect(new Clock(6, 41).plus(0).toString()).toEqual("06:41");
      });

      it("add to next hour", () => {
        expect(new Clock(0, 45).plus(40).toString()).toEqual("01:25");
      });

      it("add more than one hour", () => {
        expect(new Clock(10, 0).plus(61).toString()).toEqual("11:01");
      });

      it("add more than two hours with carry", () => {
        expect(new Clock(0, 45).plus(160).toString()).toEqual("03:25");
      });

      it("add across midnight", () => {
        expect(new Clock(23, 59).plus(2).toString()).toEqual("00:01");
      });

      it("add more than one day (1500 min = 25 hrs)", () => {
        expect(new Clock(5, 32).plus(1500).toString()).toEqual("06:32");
      });

      it("add more than two days", () => {
        expect(new Clock(1, 1).plus(3500).toString()).toEqual("11:21");
      });

      it("subtract minutes", () => {
        expect(new Clock(10, 3).minus(3).toString()).toEqual("10:00");
      });

      it("subtract to previous hour", () => {
        expect(new Clock(10, 3).minus(30).toString()).toEqual("09:33");
      });

      it("subtract more than an hour", () => {
        expect(new Clock(10, 3).minus(70).toString()).toEqual("08:53");
      });

      it("subtract across midnight", () => {
        expect(new Clock(0, 3).minus(4).toString()).toEqual("23:59");
      });

      it("subtract more than two hours", () => {
        expect(new Clock(0, 0).minus(160).toString()).toEqual("21:20");
      });

      it("subtract more than two hours with borrow", () => {
        expect(new Clock(6, 15).minus(160).toString()).toEqual("03:35");
      });

      it("subtract more than one day (1500 min = 25 hrs)", () => {
        expect(new Clock(5, 32).minus(1500).toString()).toEqual("04:32");
      });

      it("subtract more than two days", () => {
        expect(new Clock(2, 20).minus(3000).toString()).toEqual("00:20");
      });
    });

    describe("Construct two separate clocks, set times, test if they are equal", () => {
      it("clocks with same time", () => {
        expect(new Clock(15, 37).equals(new Clock(15, 37))).toBeTruthy();
      });

      it("clocks a minute apart", () => {
        expect(new Clock(15, 36).equals(new Clock(15, 37))).toBeFalsy();
      });

      it("clocks an hour apart", () => {
        expect(new Clock(14, 37).equals(new Clock(15, 37))).toBeFalsy();
      });

      it("clocks with hour overflow", () => {
        expect(new Clock(10, 37).equals(new Clock(34, 37))).toBeTruthy();
      });

      it("clocks with hour overflow by several days", () => {
        expect(new Clock(3, 11).equals(new Clock(99, 11))).toBeTruthy();
      });

      it("clocks with negative hour", () => {
        expect(new Clock(22, 40).equals(new Clock(-2, 40))).toBeTruthy();
      });

      it("clocks with negative hour that wraps", () => {
        expect(new Clock(17, 3).equals(new Clock(-31, 3))).toBeTruthy();
      });

      it("clocks with negative hour that wraps multiple times", () => {
        expect(new Clock(13, 49).equals(new Clock(-83, 49))).toBeTruthy();
      });

      it("clocks with minute overflow", () => {
        expect(new Clock(0, 1).equals(new Clock(0, 1441))).toBeTruthy();
      });

      it("clocks with minute overflow by several days", () => {
        expect(new Clock(2, 2).equals(new Clock(2, 4322))).toBeTruthy();
      });

      it("clocks with negative minute", () => {
        expect(new Clock(2, 40).equals(new Clock(3, -20))).toBeTruthy();
      });

      it("clocks with negative minute that wraps", () => {
        expect(new Clock(4, 10).equals(new Clock(5, -1490))).toBeTruthy();
      });

      it("clocks with negative minute that wraps multiple times", () => {
        expect(new Clock(6, 15).equals(new Clock(6, -4305))).toBeTruthy();
      });

      it("clocks with negative hours and minutes", () => {
        expect(new Clock(7, 32).equals(new Clock(-12, -268))).toBeTruthy();
      });

      it("clocks with negative hours and minutes that wrap", () => {
        expect(new Clock(18, 7).equals(new Clock(-54, -11513))).toBeTruthy();
      });
    });
  });
});