Agent runtime: majordomo in-process, Ollama Cloud config, chat endpoint (#56) (#70)

Co-authored-by: Steve Dudenhoeffer <[email protected]>

internal/api/api.go

@@ -12,6 +12,7 @@ import (
 	"github.com/gin-gonic/gin"
 	sloggin "github.com/samber/slog-gin"
 
+	"gitea.stevedudenhoeffer.com/steve/pansy/internal/agent"
 	"gitea.stevedudenhoeffer.com/steve/pansy/internal/config"
 	"gitea.stevedudenhoeffer.com/steve/pansy/internal/service"
 )
@@ -22,6 +23,9 @@ type handlers struct {
 	cfg  *config.Config
 	svc  *service.Service
 	oidc *oidcClient // nil unless OIDC is configured (see config.OIDCReady)
+	// agent is nil unless the assistant is configured; the chat routes are only
+	// registered when it isn't, so a handler never has to check.
+	agent *agent.Runner
 }
 
 // New builds the gin engine with the standard middleware stack and registers the
@@ -118,6 +122,27 @@ func New(cfg *config.Config, svc *service.Service) *gin.Engine {
 	plantings.PATCH("/:id", h.updatePlanting)
 	plantings.DELETE("/:id", h.deletePlanting)
 
+	// The garden assistant, registered only when it can actually be offered —
+	// the same shape as OIDC. An instance with no API key serves the app
+	// normally and simply doesn't have these routes.
+	if cfg.Agent.Ready() {
+		runner, err := agent.NewRunner(svc, cfg)
+		if err != nil {
+			// Configured but unusable (an unresolvable model spec, say). Log it and
+			// carry on without the assistant rather than refusing to start: a
+			// garden planner that won't boot because of a chat feature is worse
+			// than one without chat.
+			slog.Error("api: garden assistant disabled", "error", err)
+		} else {
+			h.agent = runner
+			agentGroup := v1.Group("/agent", h.requireAuth())
+			agentGroup.POST("/chat", h.agentChat)
+			gardens.GET("/:id/agent/history", h.getAgentHistory)
+			gardens.DELETE("/:id/agent/history", h.deleteAgentHistory)
+			slog.Info("api: garden assistant enabled", "model", cfg.Agent.Model)
+		}
+	}
+
 	// Undo. A change set is addressed by its own id; the service resolves the
 	// owning garden for the permission check, same as objects and plantings.
 	changeSets := v1.Group("/change-sets", h.requireAuth())