package pflag

import (
	"fmt"
	"os"
	"testing"
)

func setUpBytesHex(bytesHex *[]byte) *FlagSet {
	f := NewFlagSet("test", ContinueOnError)
	f.BytesHexVar(bytesHex, "bytes", []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0}, "Some bytes in HEX")
	f.BytesHexVarP(bytesHex, "bytes2", "B", []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0}, "Some bytes in HEX")
	return f
}

func TestBytesHex(t *testing.T) {
	testCases := []struct {
		input    string
		success  bool
		expected string
	}{
		/// Positive cases
		{"", true, ""}, // Is empty string OK ?
		{"01", true, "01"},
		{"0101", true, "0101"},
		{"1234567890abcdef", true, "1234567890ABCDEF"},
		{"1234567890ABCDEF", true, "1234567890ABCDEF"},

		// Negative cases
		{"0", false, ""},   // Short string
		{"000", false, ""}, /// Odd-length string
		{"qq", false, ""},  /// non-hex character
	}

	devnull, _ := os.Open(os.DevNull)
	os.Stderr = devnull

	for i := range testCases {
		var bytesHex []byte
		f := setUpBytesHex(&bytesHex)

		tc := &testCases[i]

		// --bytes
		args := []string{
			fmt.Sprintf("--bytes=%s", tc.input),
			fmt.Sprintf("-B  %s", tc.input),
			fmt.Sprintf("--bytes2=%s", tc.input),
		}

		for _, arg := range args {
			err := f.Parse([]string{arg})

			if err != nil && tc.success == true {
				t.Errorf("expected success, got %q", err)
				continue
			} else if err == nil && tc.success == false {
				// bytesHex, err := f.GetBytesHex("bytes")
				t.Errorf("expected failure while processing %q", tc.input)
				continue
			} else if tc.success {
				bytesHex, err := f.GetBytesHex("bytes")
				if err != nil {
					t.Errorf("Got error trying to fetch the IP flag: %v", err)
				}
				if fmt.Sprintf("%X", bytesHex) != tc.expected {
					t.Errorf("expected %q, got '%X'", tc.expected, bytesHex)
				}
			}
		}
	}
}