using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;

namespace System.Extensions
{
    internal static class Diagnostics
    {
        public const string DependencyPropertyGenerator_NoAttributeFound = "DGD 0001";
        public const string DependencyPropertyGenerator_ClassMustBeTopLevel = "DGD 1001";
        public const string DependencyPropertyGenerator_ClassMustBePartial = "DGD 1002";
        public const string DependencyPropertyGenerator_ClassMustBeInNamespace = "DGD 1003";
        public const string DependencyPropertyGenerator_ClassMustImplementINotifyPropertyChanged = "DGD 1004";

        public static Diagnostic MissingAttributeDiagnostic(string attributeName, string attributeNamespace) => Diagnostic.Create(
                    new DiagnosticDescriptor(
                        DependencyPropertyGenerator_NoAttributeFound,
                        $"{attributeNamespace}.{attributeName} not found",
                        "Could not find attribute with name {0} in namespace {1}.",
                        "WpfExtended.SourceGeneration",
                        DiagnosticSeverity.Error,
                        true,
                        $"This error occurs when the attribute generated by the {nameof(DependencyPropertyGenerator)} is not found",
                        null),
                    Location.None,
                    attributeName, attributeNamespace);

        public static Diagnostic ClassNotTopLevelDiagnostic(string className, string containingSymbol, SyntaxTree syntaxTree, TextSpan textSpan) => Diagnostic.Create(
                    new DiagnosticDescriptor(
                        DependencyPropertyGenerator_ClassMustBeTopLevel,
                        $"{className} must be top level",
                        "Class {0} must be top level. It is currently declared under {1}.",
                        "WpfExtended.SourceGeneration",
                        DiagnosticSeverity.Error,
                        true,
                        null,
                        null),
                    Location.Create(syntaxTree, textSpan),
                    className, containingSymbol);

        public static Diagnostic ClassNotPartial(string className) => Diagnostic.Create(
                    new DiagnosticDescriptor(
                        DependencyPropertyGenerator_ClassMustBePartial,
                        $"{className} is not partial",
                        "Class {0} must be marked as partial in order for the generator to work",
                        "WpfExtended.SourceGeneration",
                        DiagnosticSeverity.Error,
                        true,
                        null,
                        null),
                    Location.None,
                    className);

        public static Diagnostic ClassNotInNamespace(string className) => Diagnostic.Create(
                    new DiagnosticDescriptor(
                        DependencyPropertyGenerator_ClassMustBeInNamespace,
                        $"{className} is not defined in a namespace",
                        "Class {0} must be defined inside a namespace for the generator to work",
                        "WpfExtended.SourceGeneration",
                        DiagnosticSeverity.Error,
                        true,
                        null,
                        null),
                    Location.None,
                    className);

        public static Diagnostic ClassDoesNotImplementINotifyPropertyChanged(string className) => Diagnostic.Create(
                    new DiagnosticDescriptor(
                        DependencyPropertyGenerator_ClassMustImplementINotifyPropertyChanged,
                        $"{className} must implement INotifyPropertyChanged",
                        "Class {0} must implement INotifyPropertyChanged for the generator to work",
                        "WpfExtended.SourceGeneration",
                        DiagnosticSeverity.Error,
                        true,
                        null,
                        null),
                    Location.None,
                    className);
    }
}