package shared

import (
	"testing"

	"github.com/stretchr/testify/require"
)

func TestParseLanguageTag(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name        string
		input       string
		want        string
		wantErrCode string
		wantErr     string
	}{
		{
			name:  "canonicalizes valid tag",
			input: " en-us ",
			want:  "en-US",
		},
		{
			name:        "rejects invalid tag",
			input:       "en-@",
			wantErrCode: ErrorCodeInvalidRequest,
			wantErr:     "language tag must be a valid BCP 47 language tag",
		},
	}

	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			got, err := ParseLanguageTag(tt.input)
			if tt.wantErr != "" {
				require.Error(t, err)
				require.Empty(t, got)
				require.Equal(t, tt.wantErrCode, CodeOf(err))
				require.Equal(t, tt.wantErr, err.Error())
				return
			}

			require.NoError(t, err)
			require.Equal(t, tt.want, got.String())
		})
	}
}

func TestParseTimeZoneName(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name        string
		input       string
		want        string
		wantErrCode string
		wantErr     string
	}{
		{
			name:  "accepts valid zone",
			input: " Europe/Kaliningrad ",
			want:  "Europe/Kaliningrad",
		},
		{
			name:        "rejects invalid zone",
			input:       "Mars/Olympus",
			wantErrCode: ErrorCodeInvalidRequest,
			wantErr:     "time zone name must be a valid IANA time zone name",
		},
	}

	for _, tt := range tests {
		tt := tt
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			got, err := ParseTimeZoneName(tt.input)
			if tt.wantErr != "" {
				require.Error(t, err)
				require.Empty(t, got)
				require.Equal(t, tt.wantErrCode, CodeOf(err))
				require.Equal(t, tt.wantErr, err.Error())
				return
			}

			require.NoError(t, err)
			require.Equal(t, tt.want, got.String())
		})
	}
}

func TestParseRegistrationPreferredLanguage(t *testing.T) {
	t.Parallel()

	got, err := ParseRegistrationPreferredLanguage(" en-us ")
	require.NoError(t, err)
	require.Equal(t, "en-US", got.String())

	_, err = ParseRegistrationPreferredLanguage("bad@@tag")
	require.Error(t, err)
	require.Equal(t, ErrorCodeInvalidRequest, CodeOf(err))
	require.Equal(t, "registration_context.preferred_language must be a valid BCP 47 language tag", err.Error())
}

func TestParseRegistrationTimeZoneName(t *testing.T) {
	t.Parallel()

	got, err := ParseRegistrationTimeZoneName(" Europe/Kaliningrad ")
	require.NoError(t, err)
	require.Equal(t, "Europe/Kaliningrad", got.String())

	_, err = ParseRegistrationTimeZoneName("Mars/Olympus")
	require.Error(t, err)
	require.Equal(t, ErrorCodeInvalidRequest, CodeOf(err))
	require.Equal(t, "registration_context.time_zone must be a valid IANA time zone name", err.Error())
}