package translation_test

import (
	"os"
	"testing"

	"git.apihub24.de/admin/translation"
	exampletranslations "git.apihub24.de/admin/translation/example_translations"
)

const (
	paramTranslationValue = "tlv"
)

type testCaseError struct {
	format string
	params []string
}

type testCase struct {
	name            string
	fallbackCulture string
	keys            []string
	keyParams       [][]string
	cultures        []string
	expectedValues  []string
	errorMessages   []testCaseError
}

func getTestCases() []testCase {
	return []testCase{
		{
			name:            "Test Translation.Init",
			fallbackCulture: "",
			keys:            []string{"KEY"},
			keyParams:       [][]string{},
			cultures:        []string{"de"},
			expectedValues:  []string{"WERT"},
			errorMessages: []testCaseError{
				{
					format: "translations not initialized!",
					params: []string{},
				},
			},
		},
		{
			name:            "Test Translation.Get de",
			fallbackCulture: "",
			keys:            []string{"KEY"},
			keyParams:       [][]string{},
			cultures:        []string{"de"},
			expectedValues:  []string{"WERT"},
			errorMessages: []testCaseError{
				{
					format: "expect German KEY to have Value 'WERT' but was %[1]s",
					params: []string{paramTranslationValue},
				},
			},
		},
		{
			name:            "Test Translation.Get en",
			fallbackCulture: "",
			keys:            []string{"KEY"},
			keyParams:       [][]string{},
			cultures:        []string{"en"},
			expectedValues:  []string{"VALUE"},
			errorMessages: []testCaseError{
				{
					format: "expect English KEY to have Value 'VALUE' but was %[1]s",
					params: []string{paramTranslationValue},
				},
			},
		},
		{
			name:            "Test Translation.Get fr",
			fallbackCulture: "",
			keys:            []string{"KEY"},
			keyParams:       [][]string{},
			cultures:        []string{"fr"},
			expectedValues:  []string{"VALEUR"},
			errorMessages: []testCaseError{
				{
					format: "expect France KEY to have Value 'VALEUR' but was %[1]s",
					params: []string{paramTranslationValue},
				},
			},
		},
		{
			name:            "Test Translation.Get missing Culture Fallback to English",
			fallbackCulture: "",
			keys:            []string{"KEY"},
			keyParams:       [][]string{},
			cultures:        []string{"notexists"},
			expectedValues:  []string{"VALUE"},
			errorMessages: []testCaseError{
				{
					format: "expect Fallback KEY to have Value 'VALUE' but was %[1]s",
					params: []string{paramTranslationValue},
				},
			},
		},
		{
			name:            "Test Translation.Get can change Fallback to German",
			fallbackCulture: "de",
			keys:            []string{"KEY"},
			keyParams:       [][]string{},
			cultures:        []string{"notexists"},
			expectedValues:  []string{"WERT"},
			errorMessages: []testCaseError{
				{
					format: "expect Fallback KEY to have Value 'WERT' but was %[1]s",
					params: []string{paramTranslationValue},
				},
			},
		},
		{
			name:            "Test Translation.Get return Error message when Key not exists",
			fallbackCulture: "",
			keys:            []string{"notexists"},
			keyParams:       [][]string{},
			cultures:        []string{"de"},
			expectedValues:  []string{"no value for key notexists found in source de"},
			errorMessages: []testCaseError{
				{
					format: "expect to get the missing key and culture but get: %[1]s",
					params: []string{paramTranslationValue},
				},
			},
		},
		{
			name:            "Test Translation.Get with Parameters",
			fallbackCulture: "",
			keys:            []string{"WITH_PARAM", "WITH_PARAM", "WITH_PARAM"},
			keyParams:       [][]string{{"a", "b"}, {"a", "b"}, {"a", "b"}},
			cultures:        []string{"de", "en", "fr"},
			expectedValues:  []string{"WERT a_b", "VALUE a_b", "VALEUR a_b"},
			errorMessages: []testCaseError{
				{
					format: "expect German KEY to have Value 'WERT a_b' but was %[1]s",
					params: []string{paramTranslationValue},
				},
				{
					format: "expect English KEY to have Value 'VALUE a_b' but was %[1]s",
					params: []string{paramTranslationValue},
				},
				{
					format: "expect France KEY to have Value 'VALEUR a_b' but was %[1]s",
					params: []string{paramTranslationValue},
				},
			},
		},
	}
}

func TestMain(m *testing.M) {
	translation.Init(exampletranslations.Files)
	code := m.Run()
	os.Exit(code)
}

func Test(t *testing.T) {
	for _, tc := range getTestCases() {
		t.Run(tc.name, func(t *testing.T) {
			if len(tc.fallbackCulture) > 0 {
				translation.SetDefaultCulture(tc.fallbackCulture)
			}
			for idx := range tc.keys {
				value := translation.Get(tc.keys[idx], tc.cultures[idx])
				if idx < len(tc.keyParams) {
					value = translation.Get(tc.keys[idx], tc.cultures[idx], tc.keyParams[idx]...)
				}
				if len(tc.fallbackCulture) > 0 {
					translation.SetDefaultCulture("en")
				}
				if value != tc.expectedValues[idx] {
					params := make([]any, 0)
					for _, key := range tc.errorMessages[idx].params {
						if key == paramTranslationValue {
							params = append(params, value)
							continue
						}
						params = append(params, key)
					}
					t.Errorf(tc.errorMessages[idx].format, params...)
					return
				}
			}
		})
	}
}