using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Client.Shared.Helpers;

namespace ZB.MOM.WW.OtOpcUa.Client.Shared.Tests.Helpers;

public class ValueConverterTests
{
    /// <summary>Verifies that a boolean string "True" is converted to true.</summary>
    [Fact]
    public void ConvertValue_Bool_True()
    {
        ValueConverter.ConvertValue("True", true).ShouldBe(true);
    }

    /// <summary>Verifies that a boolean string "False" is converted to false.</summary>
    [Fact]
    public void ConvertValue_Bool_False()
    {
        ValueConverter.ConvertValue("False", false).ShouldBe(false);
    }

    /// <summary>Verifies that a byte value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_Byte()
    {
        ValueConverter.ConvertValue("255", (byte)0).ShouldBe((byte)255);
    }

    /// <summary>Verifies that a short value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_Short()
    {
        ValueConverter.ConvertValue("-100", (short)0).ShouldBe((short)-100);
    }

    /// <summary>Verifies that an unsigned short value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_UShort()
    {
        ValueConverter.ConvertValue("65535", (ushort)0).ShouldBe((ushort)65535);
    }

    /// <summary>Verifies that an integer value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_Int()
    {
        ValueConverter.ConvertValue("42", 0).ShouldBe(42);
    }

    /// <summary>Verifies that an unsigned integer value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_UInt()
    {
        ValueConverter.ConvertValue("42", 0u).ShouldBe(42u);
    }

    /// <summary>Verifies that a long value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_Long()
    {
        ValueConverter.ConvertValue("9999999999", 0L).ShouldBe(9999999999L);
    }

    /// <summary>Verifies that an unsigned long value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_ULong()
    {
        ValueConverter.ConvertValue("18446744073709551615", 0UL).ShouldBe(ulong.MaxValue);
    }

    /// <summary>Verifies that a float value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_Float()
    {
        ValueConverter.ConvertValue("3.14", 0f).ShouldBe(3.14f);
    }

    /// <summary>Verifies that a double value is converted correctly.</summary>
    [Fact]
    public void ConvertValue_Double()
    {
        ValueConverter.ConvertValue("3.14159", 0.0).ShouldBe(3.14159);
    }

    /// <summary>Verifies that a string value is converted correctly when the current value is a string.</summary>
    [Fact]
    public void ConvertValue_String_WhenCurrentIsString()
    {
        ValueConverter.ConvertValue("hello", "").ShouldBe("hello");
    }

    /// <summary>Verifies that a string value is converted correctly when the current value is null.</summary>
    [Fact]
    public void ConvertValue_String_WhenCurrentIsNull()
    {
        ValueConverter.ConvertValue("hello", null).ShouldBe("hello");
    }

    /// <summary>Verifies that a string value is converted correctly when the current value is an unknown type.</summary>
    [Fact]
    public void ConvertValue_String_WhenCurrentIsUnknownType()
    {
        ValueConverter.ConvertValue("hello", new object()).ShouldBe("hello");
    }

    /// <summary>Verifies that converting an invalid boolean value throws a FormatException.</summary>
    [Fact]
    public void ConvertValue_InvalidBool_Throws()
    {
        Should.Throw<FormatException>(() => ValueConverter.ConvertValue("notabool", true));
    }

    /// <summary>Verifies that converting an invalid integer value throws a FormatException with a descriptive message.</summary>
    [Fact]
    public void ConvertValue_InvalidInt_ThrowsWithDescription()
    {
        var ex = Should.Throw<FormatException>(() => ValueConverter.ConvertValue("notanint", 0));
        ex.Message.ShouldContain("Int32");
        ex.Message.ShouldContain("notanint");
    }

    /// <summary>Verifies that an overflow during conversion throws a FormatException.</summary>
    [Fact]
    public void ConvertValue_Overflow_ThrowsFormatException()
    {
        // OverflowException is now wrapped in a descriptive FormatException
        var ex = Should.Throw<FormatException>(() => ValueConverter.ConvertValue("256", (byte)0));
        ex.InnerException.ShouldBeOfType<OverflowException>();
    }

    // --- Client.Shared-008: Boolean aliases ---

    /// <summary>Verifies that boolean values accept numeric and word aliases.</summary>
    /// <param name="input">The input string value.</param>
    /// <param name="expected">The expected boolean value.</param>
    [Theory]
    [InlineData("1", true)]
    [InlineData("0", false)]
    [InlineData("yes", true)]
    [InlineData("no", false)]
    [InlineData("YES", true)]
    [InlineData("NO", false)]
    [InlineData("true", true)]
    [InlineData("false", false)]
    [InlineData("True", true)]
    [InlineData("False", false)]
    public void ConvertValue_Bool_AcceptsNumericAndWordAliases(string input, bool expected)
    {
        ValueConverter.ConvertValue(input, true).ShouldBe(expected);
    }

    /// <summary>Verifies that converting an invalid boolean value throws a descriptive FormatException.</summary>
    [Fact]
    public void ConvertValue_InvalidBool_ThrowsDescriptiveFormatException()
    {
        var ex = Should.Throw<FormatException>(() => ValueConverter.ConvertValue("maybe", false));
        ex.Message.ShouldContain("Boolean");
    }
}