// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0

package locale // import "miniflux.app/v2/internal/locale"

import "testing"

func TestPrintfWithMissingLanguage(t *testing.T) {
	defaultCatalog = catalog{}
	translation := NewPrinter("invalid").Printf("missing.key")

	if translation != "missing.key" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintfWithMissingKey(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"k": "v",
		},
	}

	translation := NewPrinter("en_US").Printf("missing.key")
	if translation != "missing.key" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintfWithExistingKey(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"auth.username": "Login",
		},
	}

	translation := NewPrinter("en_US").Printf("auth.username")
	if translation != "Login" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintfWithExistingKeyAndPlaceholder(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"key": "Test: %s",
		},
		"fr_FR": translationDict{
			"key": "Test : %s",
		},
	}

	translation := NewPrinter("fr_FR").Printf("key", "ok")
	if translation != "Test : ok" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintfWithMissingKeyAndPlaceholder(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"auth.username": "Login",
		},
		"fr_FR": translationDict{
			"auth.username": "Identifiant",
		},
	}

	translation := NewPrinter("fr_FR").Printf("Status: %s", "ok")
	if translation != "Status: ok" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintfWithInvalidValue(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"auth.username": "Login",
		},
		"fr_FR": translationDict{
			"auth.username": true,
		},
	}

	translation := NewPrinter("fr_FR").Printf("auth.username")
	if translation != "auth.username" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintWithMissingLanguage(t *testing.T) {
	defaultCatalog = catalog{}
	translation := NewPrinter("invalid").Print("missing.key")

	if translation != "missing.key" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintWithMissingKey(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"existing.key": "value",
		},
	}

	translation := NewPrinter("en_US").Print("missing.key")
	if translation != "missing.key" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintWithExistingKey(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"auth.username": "Login",
		},
	}

	translation := NewPrinter("en_US").Print("auth.username")
	if translation != "Login" {
		t.Errorf(`Wrong translation, got %q`, translation)
	}
}

func TestPrintWithDifferentLanguages(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"greeting": "Hello",
		},
		"fr_FR": translationDict{
			"greeting": "Bonjour",
		},
		"es_ES": translationDict{
			"greeting": "Hola",
		},
	}

	tests := []struct {
		language string
		expected string
	}{
		{"en_US", "Hello"},
		{"fr_FR", "Bonjour"},
		{"es_ES", "Hola"},
	}

	for _, test := range tests {
		translation := NewPrinter(test.language).Print("greeting")
		if translation != test.expected {
			t.Errorf(`Wrong translation for %s, got %q instead of %q`, test.language, translation, test.expected)
		}
	}
}

func TestPrintWithInvalidTranslationType(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"valid.key":   "valid string",
			"invalid.key": 12345, // not a string
		},
	}

	printer := NewPrinter("en_US")

	// Valid string should work
	translation := printer.Print("valid.key")
	if translation != "valid string" {
		t.Errorf(`Wrong translation for valid key, got %q`, translation)
	}

	// Invalid type should return the key itself
	translation = printer.Print("invalid.key")
	if translation != "invalid.key" {
		t.Errorf(`Wrong translation for invalid key, got %q`, translation)
	}
}

func TestPrintWithNilTranslation(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"nil.key": nil,
		},
	}

	translation := NewPrinter("en_US").Print("nil.key")
	if translation != "nil.key" {
		t.Errorf(`Wrong translation for nil value, got %q`, translation)
	}
}

func TestPrintWithEmptyKey(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"": "empty key translation",
		},
	}

	translation := NewPrinter("en_US").Print("")
	if translation != "empty key translation" {
		t.Errorf(`Wrong translation for empty key, got %q`, translation)
	}
}

func TestPrintWithEmptyTranslation(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"empty.value": "",
		},
	}

	translation := NewPrinter("en_US").Print("empty.value")
	if translation != "" {
		t.Errorf(`Wrong translation for empty value, got %q`, translation)
	}
}

func TestPluralWithDefaultRule(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"number_of_users": []string{"%d user (%s)", "%d users (%s)"},
		},
		"fr_FR": translationDict{
			"number_of_users": []string{"%d utilisateur (%s)", "%d utilisateurs (%s)"},
		},
	}

	printer := NewPrinter("fr_FR")
	translation := printer.Plural("number_of_users", 1, 1, "some text")
	expected := "1 utilisateur (some text)"
	if translation != expected {
		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
	}

	translation = printer.Plural("number_of_users", 2, 2, "some text")
	expected = "2 utilisateurs (some text)"
	if translation != expected {
		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
	}
}

func TestPluralWithRussianRule(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"time_elapsed.years": []string{"%d year", "%d years"},
		},
		"ru_RU": translationDict{
			"time_elapsed.years": []string{"%d год назад", "%d года назад", "%d лет назад"},
		},
	}

	printer := NewPrinter("ru_RU")

	translation := printer.Plural("time_elapsed.years", 1, 1)
	expected := "1 год назад"
	if translation != expected {
		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
	}

	translation = printer.Plural("time_elapsed.years", 2, 2)
	expected = "2 года назад"
	if translation != expected {
		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
	}

	translation = printer.Plural("time_elapsed.years", 5, 5)
	expected = "5 лет назад"
	if translation != expected {
		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
	}
}

func TestPluralWithMissingTranslation(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"number_of_users": []string{"%d user (%s)", "%d users (%s)"},
		},
		"fr_FR": translationDict{},
	}
	translation := NewPrinter("fr_FR").Plural("number_of_users", 2)
	expected := "number_of_users"
	if translation != expected {
		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
	}
}

func TestPluralWithInvalidValues(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"number_of_users": []string{"%d user (%s)", "%d users (%s)"},
		},
		"fr_FR": translationDict{
			"number_of_users": "must be a slice",
		},
	}
	translation := NewPrinter("fr_FR").Plural("number_of_users", 2)
	expected := "number_of_users"
	if translation != expected {
		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
	}
}

func TestPluralWithMissingLanguage(t *testing.T) {
	defaultCatalog = catalog{}
	translation := NewPrinter("invalid_language").Plural("test.key", 2)
	expected := "test.key"
	if translation != expected {
		t.Errorf(`Wrong translation, got %q instead of %q`, translation, expected)
	}
}

func TestPluralWithAnySliceType(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"test.key": []any{"%d item", "%d items"},
		},
	}

	printer := NewPrinter("en_US")

	translation := printer.Plural("test.key", 1, 1)
	expected := "1 item"
	if translation != expected {
		t.Errorf(`Wrong translation for singular, got %q instead of %q`, translation, expected)
	}

	translation = printer.Plural("test.key", 2, 2)
	expected = "2 items"
	if translation != expected {
		t.Errorf(`Wrong translation for plural, got %q instead of %q`, translation, expected)
	}
}

func TestPluralWithMixedAnySliceTypes(t *testing.T) {
	defaultCatalog = catalog{
		"en_US": translationDict{
			"mixed.key": []any{"single: %s", "multiple: %s", "many: %s"},
		},
	}

	printer := NewPrinter("en_US")

	// Test first element (should convert first any element to string)
	translation := printer.Plural("mixed.key", 0, "test") // n=0 uses index 0
	expected := "single: test"
	if translation != expected {
		t.Errorf(`Wrong translation for index 0, got %q instead of %q`, translation, expected)
	}

	// Test second element (should use plural form)
	translation = printer.Plural("mixed.key", 2, "items") // plural form for default language
	expected = "multiple: items"
	if translation != expected {
		t.Errorf(`Wrong translation for index 1, got %q instead of %q`, translation, expected)
	}
}

func TestPluralWithIndexOutOfBounds(t *testing.T) {
	defaultCatalog = catalog{
		"test_lang": translationDict{
			"limited.key": []string{"only one form"},
		},
	}

	// Force a scenario where getPluralForm might return an index >= len(plurals)
	// We'll create a scenario with Czech language rules
	defaultCatalog["cs_CZ"] = translationDict{
		"limited.key": []string{"one form only"}, // Only one form, but Czech has 3 plural forms
	}

	printer := NewPrinter("cs_CZ")
	// n=5 should return index 2 for Czech, but we only have 1 form (index 0)
	translation := printer.Plural("limited.key", 5)
	expected := "limited.key"
	if translation != expected {
		t.Errorf(`Wrong translation for out of bounds index, got %q instead of %q`, translation, expected)
	}
}

func TestPluralWithVariousLanguageRules(t *testing.T) {
	defaultCatalog = catalog{
		"ar_AR": translationDict{
			"items": []string{"no items", "one item", "two items", "few items", "many items", "other items"},
		},
		"pl_PL": translationDict{
			"files": []string{"one file", "few files", "many files"},
		},
		"ja_JP": translationDict{
			"photos": []string{"photos"},
		},
	}

	tests := []struct {
		language string
		key      string
		n        int
		expected string
	}{
		// Arabic tests
		{"ar_AR", "items", 0, "no items"},
		{"ar_AR", "items", 1, "one item"},
		{"ar_AR", "items", 2, "two items"},
		{"ar_AR", "items", 5, "few items"},   // n%100 >= 3 && n%100 <= 10
		{"ar_AR", "items", 15, "many items"}, // n%100 >= 11

		// Polish tests
		{"pl_PL", "files", 1, "one file"},
		{"pl_PL", "files", 3, "few files"},  // n%10 >= 2 && n%10 <= 4
		{"pl_PL", "files", 5, "many files"}, // default case

		// Japanese tests (always uses same form)
		{"ja_JP", "photos", 1, "photos"},
		{"ja_JP", "photos", 10, "photos"},
	}

	for _, test := range tests {
		printer := NewPrinter(test.language)
		translation := printer.Plural(test.key, test.n)
		if translation != test.expected {
			t.Errorf(`Wrong translation for %s with n=%d, got %q instead of %q`,
				test.language, test.n, translation, test.expected)
		}
	}
}