package year25

import (
	"testing"
)

func TestMod(t *testing.T) {
	a := -100
	b := 100
	t.Log(a % b)
}

func TestDial(t *testing.T) {
	type Args struct {
		From int
		Step int

		NextDial int
		Count    int
	}
	type TestCase struct {
		Name string
		Args
	}
	args := func(from, step int) Args {
		a := Args{
			From: from,
			Step: step,
		}
		a.NextDial, a.Count = simulateDial(from, step)
		return a
	}
	cases := []TestCase{
		{
			Name: "from 50 add 10",
			Args: args(50, 10),
		},
		{
			Name: "from 50 add -10",
			Args: args(50, -10),
		},
		{
			Name: "from 50 add 50",
			Args: args(50, 50),
		},
		{
			Name: "from 50 add 70",
			Args: args(50, 70),
		},
		{
			Name: "from 50 add 150",
			Args: args(50, 150),
		},
		{
			Name: "from 50 add 155",
			Args: args(50, 155),
		},
		{
			Name: "from 50 add 10_000",
			Args: args(50, 10_000),
		},
		{
			Name: "from 50 add -1",
			Args: args(50, -1),
		},
		{
			Name: "from 50 add -10",
			Args: args(50, -10),
		},
		{
			Name: "from 50 add -50",
			Args: args(50, -50),
		},
		{
			Name: "from 50 add -70",
			Args: args(50, -70),
		},
		{
			Name: "from 50 add -100",
			Args: args(50, -100),
		},
		{
			Name: "from 50 add -150",
			Args: args(50, -150),
		},
		{
			Name: "from 50 add -10_000",
			Args: args(50, -10_000),
		},
		{
			Name: "from 50 add 10_000",
			Args: args(50, 10_000),
		},
		{
			Name: "from 0 add 50",
			Args: args(0, 50),
		},
		{
			Name: "from 0 add -50",
			Args: args(0, -50),
		},
		{
			Name: "from 0 add 100",
			Args: args(0, 100),
		},
		{
			Name: "from 0 add -100",
			Args: args(0, -100),
		},
		{
			Name: "from 0 add 10_000",
			Args: args(0, 10_000),
		},
		{
			Name: "from 0 add -10_000",
			Args: args(0, -10_000),
		},
		{
			Name: "from 22 add -34",
			Args: args(22, -34),
		},
	}
	for _, tc := range cases {
		t.Run(tc.Name, func(t *testing.T) {
			next, count := day1Advance(tc.From, tc.Step)
			if next != tc.NextDial {
				t.Errorf("next do not match got %d, want %d", next, tc.NextDial)
			}
			if count != tc.Count {
				t.Errorf("count do not match got %d, want %d", count, tc.Count)
			}
			if !t.Failed() {
				t.Log(tc.Name, "ok", "want:", count, "got:", count)
			}
		})
	}
}

func simulateDial(dial int, value int) (int, int) {
	solution := int(0)
	for value < 0 {
		value += 1
		dial -= 1
		if dial == 0 {
			solution += 1
		}
		if dial == -1 {
			dial = 99
		}
	}
	for value > 0 {
		value -= 1
		dial += 1
		if dial == 100 {
			dial = 0
			solution += 1
		}
	}

	return dial, solution
}