package domain_test

import (
	"context"
	"testing"

	"github.com/stretchr/testify/assert"

	"git.d-ma.be/mathias/tapir/internal/domain"
)

func TestParseLanguage_KnownValuesAndEmptyAreAcceptedEverythingElseIsNot(t *testing.T) {
	tests := []struct {
		in     string
		want   domain.Language
		wantOK bool
	}{
		{"sv", domain.LangSwedish, true},
		{"auto", domain.LangAuto, true},
		{"", domain.LangSwedish, true}, // a client that sends no field keeps today's behaviour
		{"SV", "", false},              // exact match: the value reaches a request field
		{" sv", "", false},
		{"sv\n", "", false},
		{"en", "", false}, // a specific other language is not offered yet
		{"sv,en", "", false},
		{"../sv", "", false},
	}
	for _, tt := range tests {
		t.Run(tt.in, func(t *testing.T) {
			got, ok := domain.ParseLanguage(tt.in)
			assert.Equal(t, tt.wantOK, ok)
			assert.Equal(t, tt.want, got)
		})
	}
}

func TestLanguageFrom_IsSwedishWhenTheContextCarriesNoneAndOtherwiseWhatWasSet(t *testing.T) {
	assert.Equal(t, domain.LangSwedish, domain.LanguageFrom(context.Background()))
	ctx := domain.WithLanguage(context.Background(), domain.LangAuto)
	assert.Equal(t, domain.LangAuto, domain.LanguageFrom(ctx))
}