package bytes_test

import (
	"testing"

	"git.codemonkeysoftware.net/b/gigaparsec"
	"git.codemonkeysoftware.net/b/gigaparsec/bytes"
	"git.codemonkeysoftware.net/b/gigaparsec/cursor"
	"github.com/shoenig/test"
	"github.com/shoenig/test/must"
	"pgregory.net/rapid"
)

func Todo(t *testing.T) {
	t.Fatalf("TODO")
}

func TestRegexp(t *testing.T) {
	t.Run("only searches the beginning of input", Todo)
	t.Run("position is correct after match", Todo)
	t.Run("fails on unexpected error", Todo)
	t.Run("returns a useful Got value", rapid.MakeCheck(func(t *rapid.T) {

	}))
	t.Run("basically works", func(t *testing.T) {
		result, err := bytes.Regexp("a")(gigaparsec.MakeState(cursor.NewSlice([]byte("a"))))
		must.NoError(t, err)
		failed, _, msg := result.Failed()
		must.False(t, failed, must.Sprint(msg))
		succeeded, consumed, value, _, _ := result.Succeeded()
		test.True(t, succeeded)
		test.True(t, consumed)
		test.EqOp(t, "a", value)
	})
}

func TestRuneReader(t *testing.T) {
	var s = []byte("abcdefghijklmnopqrstuvwxyz")
	rr := bytes.NewRuneReader(cursor.NewSlice(s))
	for i, b := range s {
		r, n, err := rr.ReadRune()
		test.NoError(t, err)
		test.EqOp(t, 1, n)
		test.EqOp(t, r, rune(b))
		if t.Failed() {
			t.Fatalf("failed at %d", i)
		}
	}
}