package internal

import (
	"fmt"
	"testing"
)

func TestSide_String(t *testing.T) {
	const unknown = "unknown"

	seen := make(map[string]Kind, sentinelKind)
	for k := Kind(1); k < sentinelKind; k++ {
		t.Run(fmt.Sprintf("Kind %d", k), func(t *testing.T) {
			str := k.String()

			if other, ok := seen[str]; ok {
				t.Errorf("want Kind(%d).String to be unique but was a duplicate of Kind(%d)", k, other)
			} else {
				seen[str] = k
			}

			if len(str) == 0 {
				t.Errorf("want Kind(%d).String to be non-empty", k)
			}

			if str == unknown {
				t.Errorf("want Kind(%d).String to be a known value", k)
			}
		})
	}

	if KindUnknown.String() != unknown {
		t.Errorf("want Kind(0) to be unknown")
	}

	if Kind(sentinelKind).String() != unknown {
		t.Errorf("want Kind(%d) to be unknown", sentinelKind)
	}
}

func TestSide_Valid(t *testing.T) {
	for k := Kind(1); k < sentinelKind; k++ {
		if !k.Valid() {
			t.Errorf("want %s(%d) to be valid", k, k)
		}
	}

	if KindUnknown.Valid() {
		t.Errorf("want Kind(0) to be invalid")
	}

	if Kind(sentinelKind).Valid() {
		t.Errorf("want Kind(%d) to be invalid", sentinelKind)
	}
}

func TestSide_Is(t *testing.T) {
	t.Run("valid is self", func(t *testing.T) {
		for k := Kind(1); k < sentinelKind; k++ {
			if !k.Is(k) {
				t.Errorf("want Kind(%d).Is(%d) to be true", k, k)
			}
		}
	})

	t.Run("valid is unknown", func(t *testing.T) {
		for k := Kind(1); k < sentinelKind; k++ {
			if k.Is(KindUnknown) {
				t.Errorf("want Kind(%d).Is(0) to be false", k)
			}

			if k.Is(sentinelKind) {
				t.Errorf("want Kind(%d).Is(%d) to be false", k, sentinelKind)
			}

			if k.Is(struct{}{}) {
				t.Errorf("want Kind(%d).Is(other type) to be false", k)
			}
		}
	})

	t.Run("unknown is unknown", func(t *testing.T) {
		if KindUnknown.Is(KindUnknown) {
			t.Errorf("want Kind(0).Is(0) to be false")
		}

		if KindUnknown.Is(sentinelKind) {
			t.Errorf("want Kind(0).Is(%d) to be false", sentinelKind)
		}

		if sentinelKind.Is(sentinelKind) {
			t.Errorf("want Kind(%d).Is(%d) to be false", sentinelKind, sentinelKind)
		}
	})
}