// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Globalization;
using Microsoft.AspNetCore.Components.WebAssembly.Services;
using Microsoft.AspNetCore.InternalTesting;
 
namespace Microsoft.AspNetCore.Components.WebAssembly.Hosting;
 
public class WebAssemblyCultureProviderTest
{
    [Theory]
    [InlineData("fr-FR", new[] { "fr-FR", "fr" })]
    [InlineData("tzm-Latn-DZ", new[] { "tzm-Latn-DZ", "tzm-Latn", "tzm" })]
    public void GetCultures_ReturnsCultureClosure(string cultureName, string[] expected)
    {
        // Arrange
        var culture = new CultureInfo(cultureName);
 
        // Act
        var actual = WebAssemblyCultureProvider.GetCultures(culture);
 
        // Assert
        Assert.Equal(expected, actual);
    }
 
    [Fact]
    public void ThrowIfCultureChangeIsUnsupported_ThrowsIfCulturesAreDifferentAndICUShardingIsUsed()
    {
        // Arrange
        Environment.SetEnvironmentVariable("__BLAZOR_SHARDED_ICU", "1");
        try
        {
            // WebAssembly is initialized with en-US
            var cultureProvider = new WebAssemblyCultureProvider(new CultureInfo("en-US"), new CultureInfo("en-US"));
 
            // Culture is changed to fr-FR as part of the app
            using var cultureReplacer = new CultureReplacer("fr-FR");
 
            var ex = Assert.Throws<InvalidOperationException>(() => cultureProvider.ThrowIfCultureChangeIsUnsupported());
            Assert.Equal("Blazor detected a change in the application's culture that is not supported with the current project configuration. " +
                "To change culture dynamically during startup, set <BlazorWebAssemblyLoadAllGlobalizationData>true</BlazorWebAssemblyLoadAllGlobalizationData> in the application's project file.",
                ex.Message);
        }
        finally
        {
            Environment.SetEnvironmentVariable("__BLAZOR_SHARDED_ICU", null);
        }
    }
}