/*
NAME
  lex_test.go

AUTHOR
  Trek Hopton <trek@ausocean.org>

LICENSE
  This file is Copyright (C) 2019 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  under the terms of the GNU General Public License as published by the
  Free Software Foundation, either version 3 of the License, or (at your
  option) any later version.

  It is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  for more details.

  You should have received a copy of the GNU General Public License in gpl.txt.
  If not, see [GNU licenses](http://www.gnu.org/licenses).
*/

package codecutil

import (
	"bytes"
	"io"
	"strconv"
	"testing"
	"time"
)

var lexTests = []struct {
	data    []byte
	t       time.Duration
	n       int
	isValid bool // Whether or not this test should fail.
}{
	{[]byte{0x10, 0x00, 0xf3, 0x45, 0xfe, 0xd2, 0xaa, 0x4e}, time.Millisecond, 4, true},
	{[]byte{0x10, 0x00, 0xf3, 0x45, 0xfe, 0xd2, 0xaa, 0x4e}, time.Millisecond, 3, true},
	{[]byte{0x10, 0x00, 0xf3, 0x45, 0xfe, 0xd2, 0xaa, 0x4e}, 0, 2, true},
	{[]byte{0x10, 0x00, 0xf3, 0x45, 0xfe, 0xd2, 0xaa, 0x4e}, 0, 1, true},
	{[]byte{0x10, 0x00, 0xf3, 0x45, 0xfe, 0xd2, 0xaa, 0x4e}, time.Nanosecond, 0, false},
	{[]byte{0x10, 0x00, 0xf3, 0x45, 0xfe, 0xd2, 0xaa, 0x4e}, time.Millisecond, -1, false},
	{[]byte{0x10, 0x00, 0xf3, 0x45, 0xfe, 0xd2, 0xaa, 0x4e}, time.Millisecond, 15, true},
}

func TestByteLexer(t *testing.T) {
	for i, tt := range lexTests {
		t.Run(strconv.Itoa(i), func(t *testing.T) {
			dst := bytes.NewBuffer([]byte{})
			l, err := NewByteLexer(tt.n)
			if err != nil {
				if tt.isValid {
					t.Errorf("unexpected error: %v", err)
				} else {
					t.Skip()
				}
			}
			err = l.Lex(dst, bytes.NewReader(tt.data), tt.t)
			if err != nil && err != io.EOF {
				if tt.isValid {
					t.Errorf("unexpected error: %v", err)
				}
			} else if !bytes.Equal(dst.Bytes(), tt.data) {
				t.Errorf("data before and after lex are not equal: want %v, got %v", tt.data, dst.Bytes())
			}
		})
	}
}