package agent

import (
	"encoding/json"

	"ollie/backend"
	"ollie/toolsrv"
)

// Runtime holds the swappable per-agent configuration. It contains everything
// that changes on an /agent switch but is stable across turns within the same
// agent. The agent struct stores a pointer to the active Runtime; switching
// agents replaces it atomically.
type Runtime struct {
	Backend      backend.Backend
	ToolServer   toolsrv.Runner // the execute server (tool runtime, env, cwd)
	Preamble     string // compiled system prompt
	Tools        []backend.Tool
	Exec         toolExecutor
	ClassifyTool toolClassifier
	ClassifyTier func(string, json.RawMessage) ResultTier
	GenParams    backend.GenerationParams
	MaxSteps     int
	// CfgBackend and CfgModel are the backend/model overrides from the agent
	// config JSON. Empty means no override. Applied by the caller after
	// BuildRuntime returns.
	CfgBackend string
	CfgModel   string
	// CompactionModel overrides the model used for context compaction.
	// Resolved from: agent config > OLLIE_COMPACTION_MODEL env > per-backend default.
	CompactionModel string
	// Messages holds non-fatal warnings from runtime construction
	// (e.g. tool listing errors). Surfaced once at session start.
	Messages []string
}