using JdeScoping.DataSync.Services;
using Shouldly;

namespace JdeScoping.DataSync.Tests.Services;

public class ParameterFormatConverterTests
{
    [Fact]
    public void ToJdeJulianDate_Year2024Day100_Returns124100()
    {
        var date = new DateTime(2024, 4, 9); // Day 100
        var result = ParameterFormatConverter.ToJdeJulianDate(date);
        result.ShouldBe(124100);
    }

    [Fact]
    public void ToJdeJulianDate_Year1999Day365_Returns99365()
    {
        var date = new DateTime(1999, 12, 31);
        var result = ParameterFormatConverter.ToJdeJulianDate(date);
        result.ShouldBe(99365);
    }

    [Fact]
    public void ToJdeJulianDate_Year2000Day1_Returns100001()
    {
        // Year 2000 should have century bit = 1
        var date = new DateTime(2000, 1, 1);
        var result = ParameterFormatConverter.ToJdeJulianDate(date);
        result.ShouldBe(100001);
    }

    [Fact]
    public void ToJdeJulianDate_Year1998Day1_Returns98001()
    {
        // Year 1998 should have century bit = 0
        var date = new DateTime(1998, 1, 1);
        var result = ParameterFormatConverter.ToJdeJulianDate(date);
        result.ShouldBe(98001);
    }

    [Fact]
    public void ToJdeTime_143025_Returns143025()
    {
        var time = new DateTime(2024, 1, 1, 14, 30, 25);
        var result = ParameterFormatConverter.ToJdeTime(time);
        result.ShouldBe(143025);
    }

    [Fact]
    public void ToJdeTime_Midnight_Returns0()
    {
        var time = new DateTime(2024, 1, 1, 0, 0, 0);
        var result = ParameterFormatConverter.ToJdeTime(time);
        result.ShouldBe(0);
    }

    [Fact]
    public void ToJdeTime_235959_Returns235959()
    {
        var time = new DateTime(2024, 1, 1, 23, 59, 59);
        var result = ParameterFormatConverter.ToJdeTime(time);
        result.ShouldBe(235959);
    }

    [Fact]
    public void Convert_WithUtcTimezone_UsesUtc()
    {
        var converter = new ParameterFormatConverter("UTC");
        var utcTime = DateTime.SpecifyKind(new DateTime(2024, 4, 9, 12, 0, 0), DateTimeKind.Utc);
        var result = converter.Convert(utcTime, "jdeJulian");
        result.ShouldBe(124100);
    }

    [Fact]
    public void Convert_WithJdeTimeFormat_ReturnsInteger()
    {
        var converter = new ParameterFormatConverter("UTC");
        var utcTime = DateTime.SpecifyKind(new DateTime(2024, 1, 1, 14, 30, 25), DateTimeKind.Utc);
        var result = converter.Convert(utcTime, "jdetime");
        result.ShouldBe(143025);
    }

    [Fact]
    public void Convert_WithNullFormat_ReturnsAdjustedDateTime()
    {
        var converter = new ParameterFormatConverter("UTC");
        var utcTime = DateTime.SpecifyKind(new DateTime(2024, 4, 9, 12, 0, 0), DateTimeKind.Utc);
        var result = converter.Convert(utcTime, null);
        result.ShouldBeOfType<DateTime>();
        ((DateTime)result).ShouldBe(new DateTime(2024, 4, 9, 12, 0, 0));
    }

    [Fact]
    public void Convert_WithUnknownFormat_ThrowsArgumentException()
    {
        var converter = new ParameterFormatConverter("UTC");
        var utcTime = DateTime.SpecifyKind(new DateTime(2024, 4, 9, 12, 0, 0), DateTimeKind.Utc);
        Should.Throw<ArgumentException>(() => converter.Convert(utcTime, "unknown"));
    }

    [Fact]
    public void Constructor_WithLocalTimezone_Succeeds()
    {
        // Should not throw
        var converter = new ParameterFormatConverter("LOCAL");
        converter.ShouldNotBeNull();
    }

    [Fact]
    public void Constructor_WithUtcTimezone_Succeeds()
    {
        // Should not throw
        var converter = new ParameterFormatConverter("UTC");
        converter.ShouldNotBeNull();
    }

    [Fact]
    public void Convert_CaseInsensitiveFormat_ReturnsCorrectValue()
    {
        var converter = new ParameterFormatConverter("UTC");
        var utcTime = DateTime.SpecifyKind(new DateTime(2024, 4, 9, 12, 0, 0), DateTimeKind.Utc);

        // Test case insensitivity
        var result1 = converter.Convert(utcTime, "JDEJULIAN");
        var result2 = converter.Convert(utcTime, "JdeJulian");
        var result3 = converter.Convert(utcTime, "jdejulian");

        result1.ShouldBe(124100);
        result2.ShouldBe(124100);
        result3.ShouldBe(124100);
    }

    [Fact]
    public void Constructor_CaseInsensitiveTimezone_Succeeds()
    {
        // All these should work
        var converter1 = new ParameterFormatConverter("utc");
        var converter2 = new ParameterFormatConverter("Utc");
        var converter3 = new ParameterFormatConverter("local");
        var converter4 = new ParameterFormatConverter("Local");

        converter1.ShouldNotBeNull();
        converter2.ShouldNotBeNull();
        converter3.ShouldNotBeNull();
        converter4.ShouldNotBeNull();
    }
}