namespace Jint.Tests.Runtime;

public class DateTests
{
    private readonly Engine _engine;

    public DateTests()
    {
        _engine = new Engine()
            .SetValue("log", new Action<object>(Console.WriteLine))
            .SetValue("assert", new Action<bool>(Assert.True))
            .SetValue("equal", new Action<object, object>(Assert.Equal));
    }

    [Fact]
    public void NaNToString()
    {
        var value = _engine.Evaluate("new Date(NaN).toString();").AsString();
        Assert.Equal("Invalid Date", value);
    }

    [Fact]
    public void NaNToDateString()
    {
        var value = _engine.Evaluate("new Date(NaN).toDateString();").AsString();
        Assert.Equal("Invalid Date", value);
    }

    [Fact]
    public void NaNToTimeString()
    {
        var value = _engine.Evaluate("new Date(NaN).toTimeString();").AsString();
        Assert.Equal("Invalid Date", value);
    }

    [Fact]
    public void NaNToLocaleString()
    {
        var value = _engine.Evaluate("new Date(NaN).toLocaleString();").AsString();
        Assert.Equal("Invalid Date", value);
    }

    [Fact]
    public void NaNToLocaleDateString()
    {
        var value = _engine.Evaluate("new Date(NaN).toLocaleDateString();").AsString();
        Assert.Equal("Invalid Date", value);
    }

    [Fact]
    public void NaNToLocaleTimeString()
    {
        var value = _engine.Evaluate("new Date(NaN).toLocaleTimeString();").AsString();
        Assert.Equal("Invalid Date", value);
    }

    [Fact]
    public void ToJsonFromNaNObject()
    {
        var result = _engine.Evaluate("JSON.stringify({ date: new Date(NaN) });");
        Assert.Equal("{\"date\":null}", result.ToString());
    }

    [Fact]
    public void ValuePrecisionIsIntegral()
    {
        var number = _engine.Evaluate("new Date() / 1").AsNumber();
        Assert.Equal((long) number, number);

        var dateInstance = _engine.Realm.Intrinsics.Date.Construct(123);
        Assert.Equal((long) dateInstance.DateValue, dateInstance.DateValue);
    }

    [Fact]
    public void ToStringFollowsJavaScriptFormat()
    {
        TimeZoneInfo timeZoneInfo;
        try
        {
            timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("Asia/Shanghai");
        }
        catch
        {
            timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("China Standard Time");
        }

        var engine = new Engine(options => options.LocalTimeZone(timeZoneInfo));

        Assert.Equal("Tue Feb 01 2022 00:00:00 GMT+0800 (China Standard Time)", engine.Evaluate("new Date(2022,1,1).toString()"));
        Assert.Equal("Tue Feb 01 2022 00:00:00 GMT+0800 (China Standard Time)", engine.Evaluate("new Date(2022,1,1)").ToString());
    }

    [Theory]
    [InlineData("Thu, 30 Jan 2020 08:00:00 PST", 1580400000000)]
    [InlineData("Thursday January 01 1970 00:00:25 UTC", 25000)]
    [InlineData("Wednesday 31 December 1969 18:01:26 MDT", 86000)]
    [InlineData("Wednesday 31 December 1969 19:00:08 EST", 8000)]
    [InlineData("Wednesday 31 December 1969 17:01:59 PDT", 119000)]
    [InlineData("December 31 1969 17:01:14 MST", 74000)]
    [InlineData("January 01 1970 01:46:06 +0145", 66000)]
    [InlineData("December 31 1969 17:00:50 PDT", 50000)]
    public void CanParseLocaleString(string input, long expected)
    {
        Assert.Equal(expected, _engine.Evaluate($"new Date('{input}') * 1").AsNumber());
    }

    [Theory]
    [InlineData("December 31 1900 12:00:00 +0300", 31)]
    [InlineData("January 1 1969 12:00:00 +0300", 1)]
    [InlineData("December 31 1969 12:00:00 +0300", 31)]
    [InlineData("January 1 1970 12:00:00 +0300", 1)]
    [InlineData("December 31 1970 12:00:00 +0300", 31)]
    public void CanParseDate(string input, int expectedDate)
    {
        TimeZoneInfo timeZoneInfo;
        try
        {
            timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("Europe/Kiev");
        }
        catch
        {
            timeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("FLE Standard Time");
        }
        var engine = new Engine(options => options.LocalTimeZone(timeZoneInfo));
        Assert.Equal(expectedDate, _engine.Evaluate($"new Date('{input}').getDate()").AsNumber());
    }

    [Fact]
    public void CanUseMoment()
    {
        var momentJs = EngineTests.GetEmbeddedFile("moment.js");
        _engine.Execute(momentJs);

        var parsedDate = _engine.Evaluate("moment().format('yyyy')").ToString();
        Assert.Equal(DateTime.Now.Year.ToString(),parsedDate);
    }

    [Fact]
    public void CanParseEmptyDate()
    {
        Assert.True(double.IsNaN(_engine.Evaluate("Date.parse('')").AsNumber()));
    }
}