package parsekit_test

import (
	"testing"

	"git.makaay.nl/mauricem/go-parsekit"
)

func TestWithinTokenHandler_AcceptIncludesAndSkipIgnoresRuneInOutput(t *testing.T) {
	parser := parsekit.NewMatcher(func(t *parsekit.TokenAPI) bool {
		for i := 0; i < 33; i++ {
			t.NextRune()
			t.Accept()
			t.NextRune()
			t.Skip()
		}
		return true
	}, "test")
	output, _ := parser.Execute("Txhxixsx xsxhxoxuxlxdx xbxexcxoxmxex xqxuxixtxex xrxexaxdxaxbxlxex")
	if output != "This should become quite readable" {
		t.Fatalf("Got unexpected output from TokenHandler: %s", output)
	}
}

func TestGivenNextRuneCalled_WithoutAcceptOrSkip_NextCallToNextRunePanics(t *testing.T) {
	parser := parsekit.NewMatcher(func(t *parsekit.TokenAPI) bool {
		t.NextRune()
		t.NextRune()
		return false
	}, "test")
	RunPanicTest(t, PanicTest{
		func() { parser.Execute("input string") },
		`TokenHandler bug: NextRune\(\) was called from .*NextCallToNextRunePanics.* ` +
			`at .*/tokenhandler_test\.go:\d+ without accepting or skipping the previously read rune`})
}

func TestGivenNextRuneNotCalled_CallToAcceptPanics(t *testing.T) {
	parser := parsekit.NewMatcher(func(t *parsekit.TokenAPI) bool {
		t.Accept()
		return false
	}, "test")
	RunPanicTest(t, PanicTest{
		func() { parser.Execute("input string") },
		`TokenHandler bug: Accept\(\) was called from .*CallToAcceptPanics.* ` +
			`at .*/tokenhandler_test\.go:\d+ without a prior call to NextRune\(\)`})
}

func TestGivenNextRuneNotCalled_CallToSkipPanics(t *testing.T) {
	parser := parsekit.NewMatcher(func(t *parsekit.TokenAPI) bool {
		t.Skip()
		return false
	}, "test")
	RunPanicTest(t, PanicTest{
		func() { parser.Execute("input string") },
		`TokenHandler bug: Skip\(\) was called from .*CallToSkipPanics.* ` +
			`at .*tokenhandler_test\.go:\d+ without a prior call to NextRune\(\)`})
}

func TestGivenNextRuneReturningNotOk_CallToAcceptPanics(t *testing.T) {
	parser := parsekit.NewMatcher(func(t *parsekit.TokenAPI) bool {
		t.NextRune()
		t.Accept()
		return false
	}, "test")
	RunPanicTest(t, PanicTest{
		func() { parser.Execute("\xcd") },
		`TokenHandler bug: Accept\(\) was called from .*CallToAcceptPanics.* ` +
			`at .*tokenhandler_test\.go:\d+, but prior call to NextRune\(\) did not ` +
			`return OK \(EOF or invalid rune\)`})
}

func TestGivenRootTokenAPI_CallingMergePanics(t *testing.T) {
	RunPanicTest(t, PanicTest{
		func() {
			a := parsekit.TokenAPI{}
			a.Merge()
		},
		`TokenHandler bug: Cannot call Merge a a non-forked MatchDialog`,
	})
}