package journal

import (
	"errors"
	"strings"
	"testing"
)

func TestAttrKeyValid(t *testing.T) {
	for _, testcase := range []struct {
		name, key string
		valid     bool
		reason    InvalidAttrKeyReason
	}{
		{"short", "MESSAGE", true, -1},
		{"underscore", "MESSAGE_", true, -1},
		{"numeric", "12345", true, -1},
		{"long", strings.Repeat("Z", 255), true, -1},
		{"too_long", strings.Repeat("Z", 256), false, AttrKeyLength},
		{"empty", "", false, AttrKeyEmpty},
		{"trusted", "_MESSAGE", false, AttrKeyTrusted},
		{"punctuation", "MESSAGE-2", false, AttrKeyInvalidChars},
		{"lowercase", "message", false, AttrKeyInvalidChars},
		{"space", "MESS AGE", false, AttrKeyInvalidChars},
		{"newline", "MESS\nAGE", false, AttrKeyInvalidChars},
		{"NUL", "\x00", false, AttrKeyInvalidChars},
	} {
		if testcase.valid {
			t.Run("valid/"+testcase.name, func(t *testing.T) {
				if err := AttrKeyValid(testcase.key); err != nil {
					t.Errorf("unexpected error: %v", err)
				}
			})
		} else {
			t.Run("invalid/"+testcase.name, func(t *testing.T) {
				err := AttrKeyValid(testcase.key)
				var iak *InvalidAttrKey
				switch {
				case err == nil:
					t.Error("unexpectedly succeeded")
				case errors.As(err, &iak):
					if iak.Key != testcase.key {
						t.Errorf("InvalidAttrKey error has wrong key %q", iak.Key)
					}
					if iak.Reason != testcase.reason {
						t.Errorf("InvalidAttrKey error has wrong reason %v", iak.Reason)
					}
				default:
					t.Errorf("unexpected error type %T: %v", err, err)
				}
			})
		}
	}
}

func TestNewAttrKeyValid(t *testing.T) {
	k, err := NewAttrKey("MESSAGE")
	if err != nil {
		t.Errorf("unexpected error: %v", err)
	}
	if k.key != "MESSAGE" {
		t.Errorf(".key does not match expected: %q", k.key)
	}
}

func TestNewAttrKeyInvalid(t *testing.T) {
	k, err := NewAttrKey("_MESSAGE")
	var iak *InvalidAttrKey
	switch {
	case err == nil:
		t.Error("unexpectedly succeeded")
	case errors.As(err, &iak):
		if iak.Key != "_MESSAGE" {
			t.Errorf("InvalidAttrKey error has wrong key %q", iak.Key)
		}
		if iak.Reason != AttrKeyTrusted {
			t.Errorf("InvalidAttrKey error has wrong reason %v", iak.Reason)
		}
	default:
		t.Errorf("unexpected error type %T: %v", err, err)
	}
	if k.key != "" {
		t.Errorf(".key not empty: %q", k.key)
	}
}