package day25

import (
	"testing"

	mapset "github.com/deckarep/golang-set/v2"
)

func TestReadFileExample(t *testing.T) {
	filename := "example"
	g := ReadGraphFile(filename)
	t.Logf("read graph %+v", g)
}

func TestRemoveEdge(t *testing.T) {
	filename := "example"
	g := ReadGraphFile(filename)
	t.Logf("read graph %+v", g)

	g.RemoveEdge("bvb", "hfx")
	t.Logf("after removing bvb-hfv %+v", g)
}

func TestCreateExampleMermaid(t *testing.T) {
	filename := "example"
	g := ReadGraphFile(filename)

	g.SaveAsMermaid("example-graph.mmd")
}

func TestComponentOnInitial(t *testing.T) {
	// should be all nodes
	filename := "example"
	g := ReadGraphFile(filename)
	comp := g.ComponentFrom("bvb")
	t.Logf("got component %+v", comp)
	if comp.Cardinality() != len(g.Nodes) {
		t.Errorf("should have same size!")
	}
}

func TestComponentOnMini(t *testing.T) {
	// should be all nodes
	filename := "example2"
	g := ReadGraphFile(filename)
	comp := g.ComponentFrom("jqt")
	t.Logf("got component %+v", comp)
	if comp.Cardinality() == len(g.Nodes) {
		t.Errorf("should have different size!")
	}
}

func TestRemoveAllCycles(t *testing.T) {
	filename := "example"
	g := ReadGraphFile(filename)
	g.SaveAsMermaid("example-before-removing.mmd")
	t.Logf("initial graph is %+v", g)
	edges := g.RemoveAllCycles()
	expectedNecessary := mapset.NewSet[Edge](
		CreateEdge("hfx", "pzl"),
		CreateEdge("bvb", "cmg"),
		CreateEdge("nvd", "jqt"),
	)

	intersection := expectedNecessary.Intersect(edges)
	t.Logf("i expect that exactly two will be in intersection %+v", intersection)
	if intersection.Cardinality() != 2 {
		panic("huh?")
		// ok, this is not what i expected.
		// this is unstable. but i could run it several times? and hopefully luck out?
	}

	t.Logf("removed edges %+v", edges)
	t.Logf("after removal graph is %+v", g)
	g.SaveAsMermaid("example-after-removing.mmd")
}

func TestSplittingExample(t *testing.T) {
	filename := "example"
	g := ReadGraphFile(filename)
	result := g.TryToSplit()
	t.Logf("hopefully same as example answer: %d", result)
}

func TestSplittingInput(t *testing.T) {
	// kind of brute force
	result := 0
	filename := "input"

	for result == 0 {
		g := ReadGraphFile(filename)
		result = g.TryToSplit()
		t.Logf("hopefully as answer: %d", result)
	}

}