// TEMPLATE: AgentBootstrap.cs
// PURPOSE: Extension method to register ModelRegistry + a default agent in DI.
// READS STANDARDS: ai-agents-setup, ai-agents-providers-model-registry
// PLACEHOLDERS:
//   {{PROJECT_NAMESPACE}}     — root namespace of the project
//   {{DEFAULT_AGENT_NAME}}    — first agent name (e.g., "DefaultAssistant")
//   {{DEFAULT_INSTRUCTIONS}}  — system prompt for default agent (1 line)
// LAST-VERIFIED: 2026-05-19 (MAF 1.0 GA)

using Microsoft.Agents.AI;
using Microsoft.Extensions.AI;
using Microsoft.Extensions.DependencyInjection;

namespace {{PROJECT_NAMESPACE}}.AI;

public static class AgentBootstrap
{
    /// <summary>
    /// Register ModelRegistry (singleton) and the default agent.
    /// Additional agents register themselves via builder.AddAIAgent("Name", ...).
    /// </summary>
    public static WebApplicationBuilder AddMafAgents(this WebApplicationBuilder builder)
    {
        // Single source of truth for model selection
        builder.Services.AddSingleton<ModelRegistry>();

        // Default agent — uses the default alias from model-registry.json
        builder.Services.AddKeyedSingleton<AIAgent>("{{DEFAULT_AGENT_NAME}}", (sp, _) =>
        {
            var registry = sp.GetRequiredService<ModelRegistry>();
            var chatClient = registry.GetChatClient(registry.DefaultAlias);
            return chatClient.AsAIAgent(
                instructions: "{{DEFAULT_INSTRUCTIONS}}",
                name: "{{DEFAULT_AGENT_NAME}}");
        });

        return builder;
    }
}