using Microsoft.CodeAnalysis;

namespace StellaOps.Microservice.SourceGen;

/// <summary>
/// Diagnostic descriptors for the source generator.
/// </summary>
internal static class DiagnosticDescriptors
{
    private const string Category = "StellaOps.Microservice";

    /// <summary>
    /// Class with [StellaEndpoint] must implement IStellaEndpoint or IRawStellaEndpoint.
    /// </summary>
    public static readonly DiagnosticDescriptor MissingHandlerInterface = new(
        id: "STELLA001",
        title: "Missing handler interface",
        messageFormat: "Class '{0}' with [StellaEndpoint] must implement IStellaEndpoint<TRequest, TResponse> or IRawStellaEndpoint",
        category: Category,
        defaultSeverity: DiagnosticSeverity.Error,
        isEnabledByDefault: true);

    /// <summary>
    /// Duplicate endpoint detected.
    /// </summary>
    public static readonly DiagnosticDescriptor DuplicateEndpoint = new(
        id: "STELLA002",
        title: "Duplicate endpoint",
        messageFormat: "Duplicate endpoint: {0} {1} is defined in both '{2}' and '{3}'",
        category: Category,
        defaultSeverity: DiagnosticSeverity.Warning,
        isEnabledByDefault: true);

    /// <summary>
    /// [StellaEndpoint] on abstract class is ignored.
    /// </summary>
    public static readonly DiagnosticDescriptor AbstractClassIgnored = new(
        id: "STELLA003",
        title: "Abstract class ignored",
        messageFormat: "[StellaEndpoint] on abstract class '{0}' is ignored",
        category: Category,
        defaultSeverity: DiagnosticSeverity.Warning,
        isEnabledByDefault: true);

    /// <summary>
    /// Informational: endpoints generated.
    /// </summary>
    public static readonly DiagnosticDescriptor EndpointsGenerated = new(
        id: "STELLA004",
        title: "Endpoints generated",
        messageFormat: "Generated {0} endpoint descriptors",
        category: Category,
        defaultSeverity: DiagnosticSeverity.Info,
        isEnabledByDefault: false);

    /// <summary>
    /// Schema generation failed for a type.
    /// </summary>
    public static readonly DiagnosticDescriptor SchemaGenerationFailed = new(
        id: "STELLA005",
        title: "Schema generation failed",
        messageFormat: "Failed to generate JSON Schema for type '{0}' in endpoint '{1}'",
        category: Category,
        defaultSeverity: DiagnosticSeverity.Warning,
        isEnabledByDefault: true);

    /// <summary>
    /// [ValidateSchema] applied to non-typed endpoint.
    /// </summary>
    public static readonly DiagnosticDescriptor ValidateSchemaOnRawEndpoint = new(
        id: "STELLA006",
        title: "ValidateSchema on raw endpoint",
        messageFormat: "[ValidateSchema] on class '{0}' is ignored because it implements IRawStellaEndpoint",
        category: Category,
        defaultSeverity: DiagnosticSeverity.Warning,
        isEnabledByDefault: true);

    /// <summary>
    /// External schema resource not found.
    /// </summary>
    public static readonly DiagnosticDescriptor SchemaResourceNotFound = new(
        id: "STELLA007",
        title: "Schema resource not found",
        messageFormat: "External schema resource '{0}' not found for endpoint '{1}'",
        category: Category,
        defaultSeverity: DiagnosticSeverity.Warning,
        isEnabledByDefault: true);
}