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
	CanParallelize toolClassifier
	OutputFormat  func(string) string
	MemoryTier    func(string, json.RawMessage) ResultTier
	ResetsCounter func(string) bool // true if tool resets step counter
	GenParams     backend.GenerationParams
	MaxSteps      int
	// toolRegistryRevision tracks the last-seen tool registry revision. When the
	// registry revision advances (after tool_load/unload), the next turn
	// will detect the mismatch and refetch.
	toolRegistryRevision uint64
	// 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
}