picoclaw/pkg/agent/instance.go

package agent

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"sync"

	"github.com/sipeed/picoclaw/pkg/config"
	"github.com/sipeed/picoclaw/pkg/git"
	"github.com/sipeed/picoclaw/pkg/providers"
	"github.com/sipeed/picoclaw/pkg/routing"
	"github.com/sipeed/picoclaw/pkg/session"
	"github.com/sipeed/picoclaw/pkg/tools"
)

// AgentInstance represents a fully configured agent with its own workspace,
// session manager, context builder, and tool registry.
type AgentInstance struct {
	ID             string
	Name           string
	Model          string
	Fallbacks      []string
	Workspace      string
	MaxIterations        int
	TaskReminderInterval int
	MaxTokens            int
	Temperature          float64
	ContextWindow        int
	Provider       providers.LLMProvider
	Sessions       *session.SessionManager
	ContextBuilder *ContextBuilder
	Tools          *tools.ToolRegistry
	Subagents      *config.SubagentsConfig
	SkillsFilter   []string
	Candidates     []providers.FallbackCandidate
	PlanModel      string
	PlanFallbacks  []string
	PlanCandidates []providers.FallbackCandidate

	// Interview staleness tracking: consecutive turns where MEMORY.md was not updated.
	interviewStaleCount  int
	interviewMemoryLen   int

	// Per-session worktree isolation
	worktrees  map[string]*git.WorktreeInfo // sessionKey → worktree
	worktreeMu sync.RWMutex
}

// NewAgentInstance creates an agent instance from config.
func NewAgentInstance(
	agentCfg *config.AgentConfig,
	defaults *config.AgentDefaults,
	cfg *config.Config,
	provider providers.LLMProvider,
) *AgentInstance {
	workspace := resolveAgentWorkspace(agentCfg, defaults)
	os.MkdirAll(workspace, 0o755)

	model := resolveAgentModel(agentCfg, defaults)
	fallbacks := resolveAgentFallbacks(agentCfg, defaults)

	restrict := defaults.RestrictToWorkspace
	toolsRegistry := tools.NewToolRegistry()
	toolsRegistry.Register(tools.NewReadFileTool(workspace, restrict))
	toolsRegistry.Register(tools.NewWriteFileTool(workspace, restrict))
	toolsRegistry.Register(tools.NewListDirTool(workspace, restrict))
	execTool := tools.NewExecToolWithConfig(workspace, restrict, cfg)
	toolsRegistry.Register(execTool)
	toolsRegistry.Register(tools.NewBgMonitorTool(execTool))
	toolsRegistry.Register(tools.NewEditFileTool(workspace, restrict))
	toolsRegistry.Register(tools.NewAppendFileTool(workspace, restrict))
	toolsRegistry.Register(tools.NewLogsTool())

	sessionsDir := filepath.Join(workspace, "sessions")
	sessionsManager := session.NewSessionManager(sessionsDir)

	contextBuilder := NewContextBuilder(workspace)
	contextBuilder.SetToolsRegistry(toolsRegistry)

	agentID := routing.DefaultAgentID
	agentName := ""
	var subagents *config.SubagentsConfig
	var skillsFilter []string

	if agentCfg != nil {
		agentID = routing.NormalizeAgentID(agentCfg.ID)
		agentName = agentCfg.Name
		subagents = agentCfg.Subagents
		skillsFilter = agentCfg.Skills
	}

	// Apply defaults.Orchestration: if the flag is set, ensure orchestration is enabled.
	if defaults.Orchestration {
		if subagents == nil {
			subagents = &config.SubagentsConfig{Enabled: true}
		} else {
			subagents.Enabled = true
		}
	}

	maxIter := defaults.MaxToolIterations
	if maxIter == 0 {
		maxIter = 20
	}

	reminderInterval := defaults.TaskReminderInterval
	if reminderInterval == 0 {
		reminderInterval = 5
	}

	maxTokens := defaults.MaxTokens
	if maxTokens == 0 {
		maxTokens = 8192
	}

	temperature := 0.7
	if defaults.Temperature != nil {
		temperature = *defaults.Temperature
	}

	// Resolve fallback candidates
	modelCfg := providers.ModelConfig{
		Primary:   model,
		Fallbacks: fallbacks,
	}
	candidates := providers.ResolveCandidates(modelCfg, defaults.Provider)

	// Resolve plan model (for interviewing/review phases)
	planModel := resolvePlanModel(agentCfg, defaults)
	planFallbacks := resolvePlanFallbacks(agentCfg, defaults)
	var planCandidates []providers.FallbackCandidate
	if planModel != "" {
		planModelCfg := providers.ModelConfig{
			Primary:   planModel,
			Fallbacks: planFallbacks,
		}
		planCandidates = providers.ResolveCandidates(planModelCfg, defaults.Provider)
	}

	// Startup cleanup: prune orphaned worktrees
	worktreesDir := filepath.Join(workspace, ".worktrees")
	if repoRoot := git.FindRepoRoot(workspace); repoRoot != "" {
		git.PruneOrphaned(repoRoot, worktreesDir)
	}

	return &AgentInstance{
		ID:             agentID,
		Name:           agentName,
		Model:          model,
		Fallbacks:      fallbacks,
		Workspace:      workspace,
		MaxIterations:        maxIter,
		TaskReminderInterval: reminderInterval,
		MaxTokens:            maxTokens,
		Temperature:          temperature,
		ContextWindow:        maxTokens,
		Provider:       provider,
		Sessions:       sessionsManager,
		ContextBuilder: contextBuilder,
		Tools:          toolsRegistry,
		Subagents:      subagents,
		SkillsFilter:   skillsFilter,
		Candidates:     candidates,
		PlanModel:      planModel,
		PlanFallbacks:  planFallbacks,
		PlanCandidates: planCandidates,
	}
}

// resolveAgentWorkspace determines the workspace directory for an agent.
func resolveAgentWorkspace(agentCfg *config.AgentConfig, defaults *config.AgentDefaults) string {
	if agentCfg != nil && strings.TrimSpace(agentCfg.Workspace) != "" {
		return expandHome(strings.TrimSpace(agentCfg.Workspace))
	}
	if agentCfg == nil || agentCfg.Default || agentCfg.ID == "" || routing.NormalizeAgentID(agentCfg.ID) == "main" {
		return expandHome(defaults.Workspace)
	}
	home, _ := os.UserHomeDir()
	id := routing.NormalizeAgentID(agentCfg.ID)
	return filepath.Join(home, ".picoclaw", "workspace-"+id)
}

// resolveAgentModel resolves the primary model for an agent.
func resolveAgentModel(agentCfg *config.AgentConfig, defaults *config.AgentDefaults) string {
	if agentCfg != nil && agentCfg.Model != nil && strings.TrimSpace(agentCfg.Model.Primary) != "" {
		return strings.TrimSpace(agentCfg.Model.Primary)
	}
	return defaults.Model
}

// resolveAgentFallbacks resolves the fallback models for an agent.
func resolveAgentFallbacks(agentCfg *config.AgentConfig, defaults *config.AgentDefaults) []string {
	if agentCfg != nil && agentCfg.Model != nil && agentCfg.Model.Fallbacks != nil {
		return agentCfg.Model.Fallbacks
	}
	return defaults.ModelFallbacks
}

// resolvePlanModel resolves the plan model for an agent (used during interviewing/review phases).
func resolvePlanModel(agentCfg *config.AgentConfig, defaults *config.AgentDefaults) string {
	if agentCfg != nil && agentCfg.PlanModel != nil && strings.TrimSpace(agentCfg.PlanModel.Primary) != "" {
		return strings.TrimSpace(agentCfg.PlanModel.Primary)
	}
	return defaults.PlanModel
}

// resolvePlanFallbacks resolves the plan model fallbacks for an agent.
func resolvePlanFallbacks(agentCfg *config.AgentConfig, defaults *config.AgentDefaults) []string {
	if agentCfg != nil && agentCfg.PlanModel != nil && agentCfg.PlanModel.Fallbacks != nil {
		return agentCfg.PlanModel.Fallbacks
	}
	return defaults.PlanModelFallbacks
}

// ActivateWorktree creates a worktree for a session.
// projectDir is the git repository to create the worktree in.
// If empty, falls back to ai.Workspace.
// Worktree path: <workspace>/.worktrees/<branch-basename>/
func (ai *AgentInstance) ActivateWorktree(sessionKey, taskName, projectDir string) (*git.WorktreeInfo, error) {
	if projectDir == "" {
		projectDir = ai.Workspace
	}
	repoRoot := git.FindRepoRoot(projectDir)
	if repoRoot == "" {
		return nil, fmt.Errorf("directory is not a git repository: %s", projectDir)
	}

	branchName := git.SanitizeBranchName(taskName)
	baseName := git.BranchBaseName(branchName)
	wtPath := filepath.Join(ai.Workspace, ".worktrees", baseName)

	wt, err := git.CreateWorktree(repoRoot, wtPath, branchName)
	if err != nil {
		return nil, err
	}

	ai.worktreeMu.Lock()
	if ai.worktrees == nil {
		ai.worktrees = make(map[string]*git.WorktreeInfo)
	}
	ai.worktrees[sessionKey] = wt
	ai.worktreeMu.Unlock()

	return wt, nil
}

// DeactivateWorktree safe-disposes the session's worktree.
func (ai *AgentInstance) DeactivateWorktree(sessionKey, commitMsg string, discard bool) (*git.DisposeResult, error) {
	ai.worktreeMu.Lock()
	wt, ok := ai.worktrees[sessionKey]
	if ok {
		delete(ai.worktrees, sessionKey)
	}
	ai.worktreeMu.Unlock()

	if !ok || wt == nil {
		return nil, nil
	}

	repoRoot := git.FindRepoRoot(ai.Workspace)
	if repoRoot == "" {
		return nil, fmt.Errorf("workspace is not a git repository")
	}

	// Even on discard, SafeDispose auto-commits first for safety
	if commitMsg != "" && git.HasUncommittedChanges(wt.Path) {
		_ = git.AutoCommit(wt.Path, commitMsg)
	}

	result := git.SafeDispose(repoRoot, wt)
	return &result, nil
}

// GetWorktree returns the session's active worktree, or nil.
func (ai *AgentInstance) GetWorktree(sessionKey string) *git.WorktreeInfo {
	ai.worktreeMu.RLock()
	defer ai.worktreeMu.RUnlock()
	return ai.worktrees[sessionKey]
}

// IsInWorktree returns true if the session has an active worktree.
func (ai *AgentInstance) IsInWorktree(sessionKey string) bool {
	return ai.GetWorktree(sessionKey) != nil
}

// EffectiveWorkspace returns worktree path for session, or original Workspace.
func (ai *AgentInstance) EffectiveWorkspace(sessionKey string) string {
	if wt := ai.GetWorktree(sessionKey); wt != nil {
		return wt.Path
	}
	return ai.Workspace
}

// GetWorktreeBranch returns the branch name for the session's worktree, or "".
func (ai *AgentInstance) GetWorktreeBranch(sessionKey string) string {
	if wt := ai.GetWorktree(sessionKey); wt != nil {
		return wt.Branch
	}
	return ""
}

func expandHome(path string) string {
	if path == "" {
		return path
	}
	if path[0] == '~' {
		home, _ := os.UserHomeDir()
		if len(path) > 1 && path[1] == '/' {
			return home + path[1:]
		}
		return home
	}
	return path
}