using Agent.Core.Localization;

namespace Agent.Core.Tests;

public sealed class LocaleCatalogTests
{
    [Fact]
    public void MissingSelectedKeyFallsBackToEnglish()
    {
        using var directory = new TestDirectory();
        directory.File("en.json", """{"hello":"Hello {name}","only_en":"fallback"}""");
        directory.File("ja.json", """{"hello":"こんにちは {name}"}""");
        LocaleCatalog catalog = LocaleCatalog.Load(directory.Path, "ja");
        Assert.Equal("fallback", catalog.Get("only_en"));
        Assert.Equal("こんにちは Codex", catalog.Format("hello", new Dictionary<string, object?> { ["name"] = "Codex" }));
    }

    [Fact]
    public void AdditionalLocaleLoadsWithoutCodeChange()
    {
        using var directory = new TestDirectory();
        directory.File("en.json", """{"hello":"Hello"}""");
        directory.File("zh-CN.json", """{"hello":"你好"}""");
        Assert.Equal("你好", LocaleCatalog.Load(directory.Path, "zh-CN").Get("hello"));
    }

    [Theory]
    [InlineData("{broken")]
    [InlineData("[]")]
    public void MalformedLocaleIsFatal(string json)
    {
        using var directory = new TestDirectory();
        directory.File("en.json", json);
        Assert.Throws<LocaleException>(() => LocaleCatalog.Load(directory.Path, "en"));
    }

    [Fact]
    public void UnknownKeyIsFatal()
    {
        using var directory = new TestDirectory();
        directory.File("en.json", """{"known":"value"}""");
        directory.File("ja.json", """{"known":"値","unknown":"x"}""");
        Assert.Throws<LocaleException>(() => LocaleCatalog.Load(directory.Path, "ja"));
    }

    [Fact]
    public void PlaceholderMismatchIsFatal()
    {
        using var directory = new TestDirectory();
        directory.File("en.json", """{"hello":"Hello {name}"}""");
        directory.File("ja.json", """{"hello":"こんにちは {user}"}""");
        Assert.Throws<LocaleException>(() => LocaleCatalog.Load(directory.Path, "ja"));
    }
}