// Package agents defines the Agent runtime that ties core and shell together.
package agents

import (
	"context"
	"fmt"
	"io"
	"log/slog"
	"os"
	"path/filepath"
	"sync"
	"time"

	"maunium.net/go/mautrix"
	"maunium.net/go/mautrix/event"

	"github.com/enmanuel/agents/internal/config"
	"github.com/enmanuel/agents/pkg/acl"
	"github.com/enmanuel/agents/pkg/command"
	"github.com/enmanuel/agents/pkg/decision"
	coretypes "github.com/enmanuel/agents/pkg/llm"
	"github.com/enmanuel/agents/pkg/memory"
	"github.com/enmanuel/agents/pkg/orchestration"
	"github.com/enmanuel/agents/pkg/personality"
	"github.com/enmanuel/agents/pkg/sanitize"
	"github.com/enmanuel/agents/shell/bus"
	shellcron "github.com/enmanuel/agents/shell/cron"
	"github.com/enmanuel/agents/shell/effects"
	shellknowledge "github.com/enmanuel/agents/shell/knowledge"
	shelllm "github.com/enmanuel/agents/shell/llm"
	"github.com/enmanuel/agents/shell/matrix"
	shellmcp "github.com/enmanuel/agents/shell/mcp"
	shellmem "github.com/enmanuel/agents/shell/memory"
	"github.com/enmanuel/agents/shell/ssh"
	"github.com/enmanuel/agents/tools"
	toolclock "github.com/enmanuel/agents/tools/clock"
	toolfile "github.com/enmanuel/agents/tools/file"
	toolhttp "github.com/enmanuel/agents/tools/http"
	toolknowledge "github.com/enmanuel/agents/tools/knowledgetools"
	toolmatrix "github.com/enmanuel/agents/tools/matrix"
	toolmcp "github.com/enmanuel/agents/tools/mcptools"
	toolmemory "github.com/enmanuel/agents/tools/memorytools"
	toolssh "github.com/enmanuel/agents/tools/ssh"
	toolweather "github.com/enmanuel/agents/tools/weather"
)

const (
	defaultMaxToolIterations = 5
	defaultWindowSize        = 20
)

// CommandHandler executes a built-in command and returns the response text.
type CommandHandler func(ctx context.Context, msgCtx decision.MessageContext) string

// Agent is the assembled runtime: pure core + impure shell.
type Agent struct {
	cfg         *config.AgentConfig
	personality personality.Personality
	rules       []decision.Rule
	llm         coretypes.CompleteFunc // nil when no LLM configured (simple_bot)
	matrix      *matrix.Client
	runner      *effects.Runner
	listener    *matrix.Listener
	toolReg     *tools.Registry
	logger      *slog.Logger
	cryptoStore io.Closer // non-nil when E2EE is enabled; closed on shutdown
	mcpManager  *shellmcp.Manager // nil when MCP client is disabled

	// Lifecycle — cancel stops this agent individually; done is closed when Run returns.
	cancel context.CancelFunc
	done   chan struct{}

	// Access control
	acl acl.ACL

	// Commands — handlers keyed by canonical name; cmdAliases maps alias → canonical
	commands     map[string]CommandHandler
	cmdAliases   map[string]string        // alias → canonical name
	customSpecs  []command.Spec           // specs from RegisterCommand (for !help)
	startTime    time.Time

	// Memory
	windows    map[string]memory.Window
	windowsMu  sync.RWMutex
	memStore   memory.Store // nil when memory is disabled
	windowSize int
	roomCtx    *toolmemory.RoomContext

	// Prompt-commands — loaded from prompts/*.md at startup
	promptCmds map[string]string // name → prompt content

	// Knowledge store — non-nil when knowledge is enabled
	knowledgeStore *shellknowledge.FileStore

	// Shared knowledge store — non-nil when shared_knowledge is enabled
	sharedKnowledgeStore *shellknowledge.FileStore

	// Sanitization options — nil when sanitization is disabled
	sanitizeOpts *sanitize.Options

	// Bus — set via SetBus() when running under the unified launcher
	agentBus *bus.Bus

	// Scheduler — nil when no schedules are configured
	scheduler *shellcron.Scheduler
}

// ClearWindow resets the conversation window for a room and deletes persisted
// messages from SQLite so the agent starts fresh. Implements toolmemory.WindowClearer.
func (a *Agent) ClearWindow(roomID string) {
	a.windowsMu.Lock()
	a.windows[roomID] = memory.NewWindow(a.windowSize)
	a.windowsMu.Unlock()

	if a.memStore != nil {
		if err := a.memStore.DeleteMessages(
			context.Background(), a.cfg.Agent.ID, &roomID,
		); err != nil {
			a.logger.Warn("failed to delete persisted messages on clear", "room", roomID, "err", err)
		}
	}
}

// New assembles an Agent from its config, rules, pre-resolved ACL, and logger.
// The ACL is resolved externally (e.g. from security/ YAML files) and injected here.
// Pass acl.ACL{} (empty) for open access (no restrictions).
func New(cfg *config.AgentConfig, rules []decision.Rule, agentACL acl.ACL, logger *slog.Logger) (*Agent, error) {
	// Matrix client
	matrixClient, err := matrix.New(cfg.Matrix)
	if err != nil {
		return nil, fmt.Errorf("matrix client: %w", err)
	}

	// E2EE — initialize before the sync loop starts
	var cryptoStore io.Closer
	if cfg.Matrix.Encryption.Enabled {
		storePath := filepath.Join(cfg.Matrix.Encryption.StorePath, "crypto.db")
		pickleKey := os.Getenv(cfg.Matrix.Encryption.PickleKeyEnv)
		logger.Info("initializing e2ee", "store", storePath)
		cryptoStore, err = matrixClient.InitCrypto(context.Background(), storePath, pickleKey, cfg.Agent.ID)
		if err != nil {
			return nil, fmt.Errorf("e2ee init: %w", err)
		}

		// Auto-fetch cross-signing private keys from SSSS if recovery key is configured.
		if envName := cfg.Matrix.Encryption.RecoveryKeyEnv; envName != "" {
			if rk := os.Getenv(envName); rk != "" {
				if err := matrixClient.FetchCrossSigningKeys(context.Background(), rk); err != nil {
					logger.Warn("failed to fetch cross-signing keys from SSSS (non-fatal)", "err", err)
				} else {
					logger.Info("cross-signing private keys fetched from SSSS")
				}
			}
		}

		// Sign own device with the self-signing key so Element shows it as verified.
		if err := matrixClient.SignOwnDevice(context.Background()); err != nil {
			logger.Warn("failed to sign own device (non-fatal)", "err", err)
		} else {
			logger.Info("own device signed with cross-signing key")
		}

		logger.Info("e2ee ready")
	}

	// SSH executor
	sshExec := ssh.NewExecutor(cfg.SSH, logger)

	// LLM client — optional; if no provider is configured, the agent runs as simple_bot
	var llmFunc coretypes.CompleteFunc
	if cfg.LLM.Primary.Provider != "" {
		llmLog := logger.With("component", "llm")
		primaryLLM, err := shelllm.FromConfig(cfg.LLM.Primary, llmLog)
		if err != nil {
			return nil, fmt.Errorf("primary LLM: %w", err)
		}

		llmFunc = primaryLLM
		if cfg.LLM.Fallback.Provider != "" {
			fallbackLLM, err := shelllm.FromConfig(cfg.LLM.Fallback, llmLog)
			if err != nil {
				logger.Warn("fallback LLM config error", "err", err)
			} else {
				llmFunc = shelllm.WithFallback(primaryLLM, fallbackLLM, cfg.LLM.Fallback, llmLog)
			}
		}
	} else {
		logger.Info("no LLM configured, running as command-only bot")
	}

	// Effects runner
	runner := effects.NewRunner(matrixClient, sshExec, logger)

	// Resolve base data path for this agent.
	// Priority: config storage.base_path > $AGENTS_DATA_DIR/<id> > agents/<id>/data
	dataBase := resolveDataBase(cfg)
	logger.Debug("data base path", "path", dataBase)

	// Memory subsystem
	var memStore memory.Store
	windowSize := defaultWindowSize
	roomCtx := &toolmemory.RoomContext{}

	if cfg.Memory.Enabled {
		windowSize = cfg.Memory.WindowSize
		if windowSize <= 0 {
			windowSize = defaultWindowSize
		}

		dbPath := cfg.Memory.DBPath
		if dbPath == "" {
			dbPath = filepath.Join(dataBase, "memory.db")
		}
		store, err := shellmem.New(dbPath, logger)
		if err != nil {
			return nil, fmt.Errorf("memory store: %w", err)
		}
		memStore = store
		logger.Info("memory enabled", "window_size", windowSize, "db", dbPath)
	}

	// Knowledge store
	var kStore *shellknowledge.FileStore
	if cfg.Tools.Knowledge.Enabled {
		knowledgeDir := cfg.Tools.Knowledge.Dir
		if knowledgeDir == "" {
			knowledgeDir = filepath.Join("agents", cfg.Agent.ID, "knowledge")
		}
		knowledgeDBPath := filepath.Join(dataBase, "knowledge.db")
		var kErr error
		kStore, kErr = shellknowledge.New(knowledgeDir, knowledgeDBPath, logger)
		if kErr != nil {
			logger.Error("knowledge_store_init_failed", "err", kErr)
		} else {
			if syncErr := kStore.Sync(context.Background()); syncErr != nil {
				logger.Error("knowledge_sync_failed", "err", syncErr)
			}
		}
	}

	// Shared knowledge store
	var sharedKStore *shellknowledge.FileStore
	if cfg.Tools.SharedKnowledge.Enabled {
		sharedDir := cfg.Tools.SharedKnowledge.Dir
		if sharedDir == "" {
			sharedDir = "knowledges"
		}
		sharedDBPath := cfg.Tools.SharedKnowledge.DBPath
		if sharedDBPath == "" {
			sharedDBPath = "knowledges/data/knowledge.db"
		}
		var skErr error
		sharedKStore, skErr = shellknowledge.New(sharedDir, sharedDBPath, logger)
		if skErr != nil {
			logger.Error("shared_knowledge_store_init_failed", "err", skErr)
		} else {
			if syncErr := sharedKStore.Sync(context.Background()); syncErr != nil {
				logger.Error("shared_knowledge_sync_failed", "err", syncErr)
			}
			logger.Info("shared knowledge enabled", "dir", sharedDir, "db", sharedDBPath)
		}
	}

	if !agentACL.Empty() {
		logger.Info("acl enabled (centralized security policy)")
	}

	// MCP client manager — connects to external MCP servers
	var mcpManager *shellmcp.Manager
	if cfg.Tools.MCP.Enabled && len(cfg.Tools.MCP.Servers) > 0 {
		var mcpErr error
		mcpManager, mcpErr = shellmcp.NewManager(context.Background(), cfg.Tools.MCP.Servers, logger)
		if mcpErr != nil {
			logger.Error("mcp_manager_init_failed", "err", mcpErr)
		} else {
			logger.Info("mcp manager initialized", "servers", len(cfg.Tools.MCP.Servers))
		}
	}

	// Tool registry — register tools enabled in config
	toolReg := buildToolRegistry(cfg, sshExec, matrixClient, memStore, kStore, sharedKStore, mcpManager, roomCtx, logger)

	// Rate limiting for tools
	if cfg.Security.ToolRateLimit.Enabled {
		maxCalls := cfg.Security.ToolRateLimit.MaxCallsPerMin
		if maxCalls <= 0 {
			maxCalls = 10
		}
		rl := tools.NewRateLimiter(maxCalls, time.Minute)
		toolReg.SetRateLimiter(rl)

		cleanupInterval := cfg.Security.ToolRateLimit.CleanupIntervalS
		if cleanupInterval <= 0 {
			cleanupInterval = 60
		}
		go func() {
			ticker := time.NewTicker(time.Duration(cleanupInterval) * time.Second)
			defer ticker.Stop()
			for range ticker.C {
				rl.Cleanup()
			}
		}()
		logger.Info("tool rate limiting enabled", "max_calls_per_min", maxCalls)
	}

	a := &Agent{
		cfg:                  cfg,
		acl:                  agentACL,
		rules:                rules,
		llm:                  llmFunc,
		matrix:               matrixClient,
		runner:               runner,
		toolReg:              toolReg,
		logger:               logger,
		cryptoStore:          cryptoStore,
		mcpManager:           mcpManager,
		done:                 make(chan struct{}),
		commands:             make(map[string]CommandHandler),
		cmdAliases:           command.BuiltinNames(),
		startTime:            time.Now(),
		windows:              make(map[string]memory.Window),
		memStore:             memStore,
		knowledgeStore:       kStore,
		sharedKnowledgeStore: sharedKStore,
		windowSize:           windowSize,
		roomCtx:              roomCtx,
	}

	// Configure sanitization if enabled
	if cfg.Security.Sanitize.Enabled {
		minSev := parseSeverity(cfg.Security.Sanitize.MinSeverity)
		a.sanitizeOpts = &sanitize.Options{
			Mode:             sanitize.ParseMode(cfg.Security.Sanitize.Mode),
			MinSeverity:      minSev,
			DisabledPatterns: cfg.Security.Sanitize.DisabledPatterns,
		}
		logger.Info("input sanitization enabled",
			"mode", a.sanitizeOpts.Mode,
			"min_severity", minSev,
		)
	}

	// Register built-in command handlers
	a.registerBuiltinCommands()

	// Load prompt-commands from prompts/ directory
	a.loadPromptCommands()

	// Register memory_clear_context with self as WindowClearer (after a is created)
	if cfg.Tools.Memory.Enabled && memStore != nil {
		toolReg.Register(toolmemory.NewMemoryClearContext(a, roomCtx))
	}

	// Cron scheduler — only when schedules are configured
	if len(cfg.Schedules) > 0 {
		a.scheduler = shellcron.New(cfg.Schedules, matrixClient, llmFunc, cfg.LLM.Primary.Model, logger)
		logger.Info("cron scheduler configured", "schedules", len(cfg.Schedules))
	}

	// Matrix event listener
	a.listener = matrix.NewListener(matrixClient, cfg.Matrix, a.handleEvent, logger)

	return a, nil
}

// RegisterCommand adds a custom command handler for this agent.
// The spec provides metadata (aliases, description, usage) for !help.
// Must be called before Run().
func (a *Agent) RegisterCommand(spec command.Spec, handler CommandHandler) {
	a.commands[spec.Name] = handler
	a.cmdAliases[spec.Name] = spec.Name
	for _, alias := range spec.Aliases {
		a.cmdAliases[alias] = spec.Name
	}
	a.customSpecs = append(a.customSpecs, spec)
	a.logger.Info("command_registered", "command", spec.Name, "aliases", spec.Aliases)
}

// loadPromptCommands scans the project-root prompts/ directory and loads all .md files.
func (a *Agent) loadPromptCommands() {
	prompts, err := command.LoadPromptCommands("prompts")
	if err != nil {
		a.logger.Warn("failed to load prompt-commands", "err", err)
		return
	}
	a.promptCmds = make(map[string]string, len(prompts))
	for _, p := range prompts {
		a.promptCmds[p.Name] = p.Content
	}
	if len(a.promptCmds) > 0 {
		names := make([]string, 0, len(a.promptCmds))
		for n := range a.promptCmds {
			names = append(names, n)
		}
		a.logger.Info("prompt-commands loaded", "count", len(a.promptCmds), "names", names)
	}
}

// SetBus attaches the agent to the inter-agent bus for orchestration.
// Must be called before Run().
func (a *Agent) SetBus(b *bus.Bus) {
	a.agentBus = b
}

// SetInterceptor configures the listener to skip events in orchestrated rooms.
func (a *Agent) SetInterceptor(fn matrix.InterceptFunc) {
	a.listener.SetInterceptor(fn)
}

// SetMembershipNotify registers a callback for room membership changes.
func (a *Agent) SetMembershipNotify(fn matrix.MembershipNotifyFunc) {
	a.listener.SetMembershipNotify(fn)
}

// RawMatrixClient returns the underlying *mautrix.Client for room scanning.
func (a *Agent) RawMatrixClient() *mautrix.Client {
	return a.matrix.Raw()
}

// Stop cancels this agent's individual context, causing Run to return.
// Safe to call multiple times.
func (a *Agent) Stop() {
	if a.cancel != nil {
		a.cancel()
	}
}

// Done returns a channel that is closed when Run has returned.
func (a *Agent) Done() <-chan struct{} {
	return a.done
}

// Run starts the agent sync loop. Blocks until ctx is cancelled.
func (a *Agent) Run(ctx context.Context) error {
	ctx, a.cancel = context.WithCancel(ctx)
	defer close(a.done)

	if a.cryptoStore != nil {
		defer a.cryptoStore.Close()
	}
	if a.memStore != nil {
		defer a.memStore.Close()
	}
	if a.knowledgeStore != nil {
		defer a.knowledgeStore.Close()
	}
	if a.sharedKnowledgeStore != nil {
		defer a.sharedKnowledgeStore.Close()
	}
	if a.mcpManager != nil {
		defer a.mcpManager.Close()
	}
	a.logger.Info("agent starting",
		"id", a.cfg.Agent.ID,
		"name", a.cfg.Agent.Name,
		"tools", a.toolReg.Names(),
	)

	// Set presence to online
	if err := a.matrix.SetPresence(ctx, event.PresenceOnline); err != nil {
		a.logger.Warn("failed to set presence online", "err", err)
	}
	defer func() {
		// Use background context since ctx is already cancelled at shutdown
		offlineCtx := context.Background()
		if err := a.matrix.SetPresence(offlineCtx, event.PresenceOffline); err != nil {
			a.logger.Warn("failed to set presence offline", "err", err)
		}
	}()

	// Start bus listener if connected to the orchestration bus
	if a.agentBus != nil {
		ch := a.agentBus.Subscribe(bus.AgentID(a.cfg.Agent.ID))
		go a.listenBus(ctx, ch)
		a.logger.Info("bus listener started")
	}

	// Start cron scheduler in background goroutine (blocks until ctx cancelled)
	if a.scheduler != nil {
		go a.scheduler.Start(ctx)
	}

	return a.listener.Run(ctx)
}

// listenBus processes messages from the inter-agent bus.
func (a *Agent) listenBus(ctx context.Context, ch <-chan bus.AgentMessage) {
	for {
		select {
		case <-ctx.Done():
			return
		case msg, ok := <-ch:
			if !ok {
				return
			}
			if msg.Kind == bus.KindTask {
				a.handleTaskEvent(ctx, msg)
			}
		}
	}
}

// handleTaskEvent processes a task delegated by the orchestrator.
// The bot generates a response and sends it both to Matrix and back via bus.
func (a *Agent) handleTaskEvent(ctx context.Context, msg bus.AgentMessage) {
	taskJSON, ok := msg.Payload["task_json"]
	if !ok {
		a.logger.Error("task message missing task_json payload")
		return
	}

	task, err := orchestration.UnmarshalTaskEvent(taskJSON)
	if err != nil {
		a.logger.Error("failed to unmarshal task event", "err", err)
		return
	}

	a.logger.Info("handling orchestrated task",
		"task_id", task.TaskID,
		"room", task.TargetRoomID,
		"sender", task.OriginalSender,
		"iteration", task.Iteration,
	)

	roomID := task.TargetRoomID

	// Update room context for memory tools
	a.roomCtx.Set(roomID)

	if a.cfg.Personality.Behavior.TypingIndicator {
		_ = a.matrix.SendTyping(ctx, roomID, true)
		defer a.matrix.SendTyping(ctx, roomID, false)
	}

	// Build a synthetic MessageContext from the task
	msgCtx := decision.MessageContext{
		SenderID:    task.OriginalSender,
		RoomID:      roomID,
		Content:     task.OriginalQuestion,
		IsDirectMsg: false,
		IsMention:   true, // treat orchestrated tasks like mentions
	}

	// If there are previous responses, prepend context
	if len(task.PreviousResponses) > 0 {
		var context string
		for _, pr := range task.PreviousResponses {
			context += fmt.Sprintf("[Previous response from %s]: %s\n\n", pr.BotID, pr.Text)
		}
		msgCtx.Content = context + "Original question: " + task.OriginalQuestion +
			"\n\nPlease provide an improved or complementary answer."
	}

	// Sanitize orchestrated input
	sanitized, rejected := a.sanitizeInput(msgCtx.Content, roomID, msgCtx.SenderID)
	if rejected {
		a.logger.Warn("orchestrated task rejected by sanitizer",
			"task_id", task.TaskID, "sender", task.OriginalSender)
		_ = a.matrix.SendMarkdown(ctx, roomID, "El mensaje fue rechazado por el filtro de seguridad.")
		return
	}
	msgCtx.Content = sanitized

	// Load memory and run LLM
	a.ensureWindowLoaded(ctx, roomID)
	a.appendToWindow(roomID, coretypes.Message{
		Role: coretypes.RoleUser, Content: msgCtx.Content,
	})

	reply, err := a.runLLM(ctx, msgCtx, roomID)

	// Build the result to send back via bus
	result := orchestration.TaskResult{
		TaskID: task.TaskID,
		BotID:  a.cfg.Agent.ID,
	}

	if err != nil {
		a.logger.Error("LLM error during orchestrated task", "err", err)
		result.Error = err.Error()
		reply = "Sorry, I encountered an error."
	} else {
		result.Text = reply
		// Persist assistant reply
		a.appendToWindow(roomID, coretypes.Message{
			Role: coretypes.RoleAssistant, Content: reply,
		})
		a.persistMessage(ctx, roomID, coretypes.RoleAssistant, reply)
	}

	// Send reply to Matrix room
	if sendErr := a.matrix.SendMarkdown(ctx, roomID, reply); sendErr != nil {
		a.logger.Error("failed to send orchestrated reply to Matrix", "err", sendErr)
	}

	// Send result back to orchestrator via bus
	resultJSON, marshalErr := orchestration.MarshalTaskResult(result)
	if marshalErr != nil {
		a.logger.Error("failed to marshal task result", "err", marshalErr)
		return
	}

	replyMsg := bus.AgentMessage{
		From:    bus.AgentID(a.cfg.Agent.ID),
		To:      msg.From,
		Kind:    bus.KindTaskResult,
		Payload: map[string]string{"result_json": resultJSON},
	}

	if busErr := a.agentBus.Reply(task.TaskID, replyMsg); busErr != nil {
		a.logger.Error("failed to send task result via bus", "err", busErr)
	}
}

// handleEvent is called by the matrix Listener for each filtered incoming event.
func (a *Agent) handleEvent(ctx context.Context, msgCtx decision.MessageContext, evt *event.Event) {
	a.logger.Debug("handling event",
		"sender", msgCtx.SenderID,
		"is_dm", msgCtx.IsDirectMsg,
		"is_mention", msgCtx.IsMention,
		"command", msgCtx.Command,
	)

	roomID := evt.RoomID.String()

	// Update room context for memory tools
	a.roomCtx.Set(roomID)

	if a.cfg.Personality.Behavior.TypingIndicator {
		_ = a.matrix.SendTyping(ctx, roomID, true)
		defer a.matrix.SendTyping(ctx, roomID, false)
	}

	// ── Command flow ─────────────────────────────────────────────────
	// Commands (!xxx) always resolve before rules or LLM. Never reach the LLM.
	// Priority: built-in → unknown (agent-specific commands can be added via RegisterCommand).
	if msgCtx.Command != "" {
		a.logger.Info("command_received",
			"command", msgCtx.Command,
			"sender", msgCtx.SenderID,
			"room", roomID,
			"args", msgCtx.Args,
		)

		// Resolve aliases
		cmdName := msgCtx.Command
		if canonical, ok := a.cmdAliases[cmdName]; ok {
			cmdName = canonical
		}

		if handler, ok := a.commands[cmdName]; ok {
			// RBAC check for commands
			if !a.acl.CanDo(msgCtx.SenderID, "command:"+cmdName) {
				a.logger.Info("command_denied", "command", cmdName, "sender", msgCtx.SenderID)
				_ = a.sendReply(ctx, roomID, msgCtx.EventID, msgCtx.ThreadID,
					"No tienes permisos para ejecutar este comando.")
				return
			}
			a.logger.Info("command_executed", "command", cmdName)
			reply := handler(ctx, msgCtx)
			_ = a.sendReply(ctx, roomID, msgCtx.EventID, msgCtx.ThreadID, reply)
			return
		}

		// Prompt-command: expand .md content and pass to LLM
		if content, ok := a.promptCmds[cmdName]; ok {
			a.logger.Info("prompt_command_expanded", "command", cmdName)
			msgCtx.Content = command.ExpandPrompt(content, msgCtx.Args)
			msgCtx.Command = ""
			msgCtx.Args = nil
			// Fall through to rules/LLM flow below
		} else {
			// Unknown command — never falls through to rules or LLM
			a.logger.Info("command_unknown", "command", msgCtx.Command)
			_ = a.sendReply(ctx, roomID, msgCtx.EventID, msgCtx.ThreadID,
				fmt.Sprintf("Comando desconocido: `!%s`. Usa `!help` para ver comandos disponibles.", msgCtx.Command))
			return
		}
	}

	// ── Non-command flow ─────────────────────────────────────────────
	// RBAC check for LLM access ("ask" action)
	if !a.acl.CanDo(msgCtx.SenderID, "ask") {
		a.logger.Info("ask_denied", "sender", msgCtx.SenderID)
		_ = a.sendReply(ctx, roomID, msgCtx.EventID, msgCtx.ThreadID,
			"No tienes permisos para interactuar con este agente.")
		return
	}

	actions := decision.Evaluate(msgCtx, a.rules)
	a.logger.Debug("rules evaluated", "matched_actions", len(actions))

	// If no rules matched and the message mentions the bot or is a DM, use LLM.
	if len(actions) == 0 && (msgCtx.IsMention || msgCtx.IsDirectMsg) {
		if a.llm == nil {
			// Simple bot: no LLM, ignore non-command messages
			a.logger.Debug("no LLM configured, ignoring non-command message")
			return
		}
		a.logger.Debug("no rules matched, falling back to LLM")
		actions = []decision.Action{{
			Kind: decision.ActionKindLLM,
			LLM:  &decision.LLMAction{ContextKey: msgCtx.RoomID},
		}}
	}

	if len(actions) == 0 {
		a.logger.Debug("no actions, ignoring message",
			"is_dm", msgCtx.IsDirectMsg,
			"is_mention", msgCtx.IsMention,
		)
		return
	}

	a.executeActions(ctx, roomID, msgCtx, actions)
}

// executeActions expands LLM actions and runs the effects runner.
func (a *Agent) executeActions(ctx context.Context, roomID string, msgCtx decision.MessageContext, actions []decision.Action) {
	// Auto-thread: if configured and message is not already in a thread,
	// start a new thread rooted at the user's message.
	if a.cfg.Matrix.Threads.AutoThread && msgCtx.ThreadID == "" && msgCtx.EventID != "" {
		msgCtx.ThreadID = msgCtx.EventID
	}

	// Sanitize user input before sending to LLM
	sanitized, rejected := a.sanitizeInput(msgCtx.Content, roomID, msgCtx.SenderID)
	if rejected {
		a.runner.Execute(ctx, roomID, []decision.Action{{
			Kind:  decision.ActionKindReply,
			Reply: &decision.ReplyAction{Content: "Tu mensaje fue rechazado por el filtro de seguridad.", InReplyTo: msgCtx.EventID, ThreadID: msgCtx.ThreadID},
		}})
		return
	}
	msgCtx.Content = sanitized

	// Resolve memory key: use thread root as context key when inside a thread,
	// so parallel threads in the same room have independent conversation windows.
	memKey := roomID
	if msgCtx.ThreadID != "" {
		memKey = msgCtx.ThreadID
	}

	expanded := make([]decision.Action, 0, len(actions))
	for _, act := range actions {
		if act.Kind == decision.ActionKindLLM {
			if a.llm == nil {
				a.logger.Warn("LLM action requested but no LLM configured")
				expanded = append(expanded, decision.Action{
					Kind:  decision.ActionKindReply,
					Reply: &decision.ReplyAction{Content: "Este bot no tiene LLM configurado.", InReplyTo: msgCtx.EventID, ThreadID: msgCtx.ThreadID},
				})
				continue
			}
			// Memory: load window + append user message before LLM call
			a.ensureWindowLoaded(ctx, memKey)
			a.appendToWindow(memKey, coretypes.Message{
				Role: coretypes.RoleUser, Content: msgCtx.Content,
			})
			a.persistMessage(ctx, memKey, coretypes.RoleUser, msgCtx.Content)

			reply, err := a.runLLM(ctx, msgCtx, memKey)
			if err != nil {
				a.logger.Error("llm error", "err", err)
				expanded = append(expanded, decision.Action{
					Kind:  decision.ActionKindReply,
					Reply: &decision.ReplyAction{Content: "Sorry, I encountered an error.", InReplyTo: msgCtx.EventID, ThreadID: msgCtx.ThreadID},
				})
			} else {
				expanded = append(expanded, decision.Action{
					Kind:  decision.ActionKindReply,
					Reply: &decision.ReplyAction{Content: reply, InReplyTo: msgCtx.EventID, ThreadID: msgCtx.ThreadID},
				})

				// Memory: append assistant reply after LLM call
				a.appendToWindow(memKey, coretypes.Message{
					Role: coretypes.RoleAssistant, Content: reply,
				})
				a.persistMessage(ctx, memKey, coretypes.RoleAssistant, reply)
			}
		} else {
			expanded = append(expanded, act)
		}
	}

	a.runner.Execute(ctx, roomID, expanded)
}

func (a *Agent) runLLM(ctx context.Context, msgCtx decision.MessageContext, memKey string) (string, error) {
	a.logger.Debug("calling LLM",
		"model", a.cfg.LLM.Primary.Model,
		"provider", a.cfg.LLM.Primary.Provider,
	)

	// Load system prompt from file if configured, else use description
	systemPrompt := a.cfg.Agent.Description

	// Build messages: conversation history from window (includes current user msg)
	messages := a.getWindowMessages(memKey)
	if len(messages) == 0 {
		// Fallback if memory is disabled: just the current message
		messages = []coretypes.Message{
			{Role: coretypes.RoleUser, Content: msgCtx.Content},
		}
	}

	// Build tool specs for the LLM if tool_use is enabled
	var llmTools []coretypes.ToolSpec
	if a.cfg.LLM.ToolUse.Enabled && a.toolReg.Len() > 0 {
		llmTools = a.toolReg.ToLLMSpecs()
		a.logger.Debug("tools available for LLM", "count", len(llmTools))
	}

	maxIter := a.cfg.LLM.ToolUse.MaxIterations
	if maxIter <= 0 {
		maxIter = defaultMaxToolIterations
	}

	// Tool-use loop: call LLM → execute tools → feed results back → repeat
	for i := 0; i < maxIter; i++ {
		req := coretypes.CompletionRequest{
			Model:        a.cfg.LLM.Primary.Model,
			MaxTokens:    a.cfg.LLM.Primary.MaxTokens,
			Temperature:  a.cfg.LLM.Primary.Temperature,
			SystemPrompt: systemPrompt,
			Messages:     messages,
			Tools:        llmTools,
		}

		resp, err := a.llm(ctx, req)
		if err != nil {
			a.logger.Error("LLM call failed", "model", req.Model, "err", err)
			return "", err
		}

		a.logger.Debug("LLM responded",
			"content_len", len(resp.Content),
			"tool_calls", len(resp.ToolCalls),
			"finish_reason", resp.FinishReason,
		)

		// No tool calls — return the text response
		if len(resp.ToolCalls) == 0 {
			return resp.Content, nil
		}

		// Append assistant message with tool calls to conversation
		messages = append(messages, coretypes.Message{
			Role:      coretypes.RoleAssistant,
			Content:   resp.Content,
			ToolCalls: resp.ToolCalls,
		})

		// Execute each tool and append results
		for _, tc := range resp.ToolCalls {
			a.logger.Info("executing tool",
				"tool", tc.Name,
				"call_id", tc.ID,
			)

			// RBAC check for tool execution
			if !a.acl.CanDo(msgCtx.SenderID, "tool:"+tc.Name) {
				a.logger.Info("tool_denied", "tool", tc.Name, "sender", msgCtx.SenderID)
				messages = append(messages, coretypes.Message{
					Role:       coretypes.RoleTool,
					Content:    "error: permission denied for tool " + tc.Name,
					ToolCallID: tc.ID,
				})
				continue
			}

			// Notify the room that a tool is being called (respect thread context)
			toolNotice := fmt.Sprintf("🔨 <em>%s</em>", tc.Name)
			if err := a.sendReply(ctx, msgCtx.RoomID, msgCtx.EventID, msgCtx.ThreadID, toolNotice); err != nil {
				a.logger.Warn("failed to send tool call notice", "tool", tc.Name, "err", err)
			}

			result := a.toolReg.ExecuteForRoom(ctx, tc.Name, tc.Arguments, msgCtx.RoomID)

			output := result.Output
			if result.Err != nil {
				output = fmt.Sprintf("error: %s", result.Err)
				a.logger.Warn("tool execution error",
					"tool", tc.Name,
					"err", result.Err,
				)
			} else {
				a.logger.Debug("tool executed",
					"tool", tc.Name,
					"output_len", len(output),
				)
			}

			messages = append(messages, coretypes.Message{
				Role:       coretypes.RoleTool,
				Content:    output,
				ToolCallID: tc.ID,
			})
		}
	}

	// Max iterations reached — return whatever we have
	a.logger.Warn("tool-use loop reached max iterations", "max", maxIter)
	return "I've reached the maximum number of tool iterations. Here's what I found so far.", nil
}

// ── Memory helpers ───────────────────────────────────────────────────────

// ensureWindowLoaded loads the conversation window from SQLite on first access for a room.
func (a *Agent) ensureWindowLoaded(ctx context.Context, roomID string) {
	a.windowsMu.Lock()
	defer a.windowsMu.Unlock()
	if _, ok := a.windows[roomID]; ok {
		return
	}
	w := memory.NewWindow(a.windowSize)
	if a.memStore != nil {
		msgs, err := a.memStore.LoadMessages(ctx, a.cfg.Agent.ID, roomID, a.windowSize)
		if err != nil {
			a.logger.Warn("failed to load message history", "room", roomID, "err", err)
		} else {
			for _, m := range msgs {
				w = w.Append(coretypes.Message{Role: m.Role, Content: m.Content})
			}
			if len(msgs) > 0 {
				a.logger.Debug("loaded message history", "room", roomID, "count", len(msgs))
			}
		}
	}
	a.windows[roomID] = w
}

// appendToWindow adds a message to the in-memory conversation window.
func (a *Agent) appendToWindow(roomID string, msg coretypes.Message) {
	a.windowsMu.Lock()
	defer a.windowsMu.Unlock()
	w, ok := a.windows[roomID]
	if !ok {
		w = memory.NewWindow(a.windowSize)
	}
	a.windows[roomID] = w.Append(msg)
}

// getWindowMessages returns a copy of the conversation window for a room.
func (a *Agent) getWindowMessages(roomID string) []coretypes.Message {
	a.windowsMu.RLock()
	defer a.windowsMu.RUnlock()
	w, ok := a.windows[roomID]
	if !ok {
		return nil
	}
	return w.ToLLMMessages()
}

// persistMessage saves a message to the SQLite store (no-op if store is nil).
func (a *Agent) persistMessage(ctx context.Context, roomID string, role coretypes.Role, content string) {
	if a.memStore == nil {
		return
	}
	if err := a.memStore.SaveMessage(ctx, memory.HistoryMessage{
		AgentID: a.cfg.Agent.ID,
		RoomID:  roomID,
		Role:    role,
		Content: content,
	}); err != nil {
		a.logger.Warn("failed to persist message", "room", roomID, "err", err)
	}
}

// sendReply sends a markdown reply that respects thread context.
// If threadID is non-empty, the reply is sent as part of that thread.
func (a *Agent) sendReply(ctx context.Context, roomID, eventID, threadID, markdown string) error {
	if threadID != "" {
		return a.matrix.SendThreadMarkdown(ctx, roomID, threadID, eventID, markdown)
	}
	return a.matrix.SendReplyMarkdown(ctx, roomID, eventID, markdown)
}

// parseSeverity converts a config string to sanitize.Severity.
func parseSeverity(s string) sanitize.Severity {
	switch s {
	case "high":
		return sanitize.SeverityHigh
	case "low":
		return sanitize.SeverityLow
	default:
		return sanitize.SeverityMedium
	}
}

// sanitizeInput runs prompt injection detection on the message content.
// Returns the (possibly modified) content and true if the message should be rejected.
func (a *Agent) sanitizeInput(content, roomID, senderID string) (string, bool) {
	if a.sanitizeOpts == nil {
		return content, false
	}

	result := sanitize.Sanitize(content, *a.sanitizeOpts)

	for _, w := range result.Warnings {
		a.logger.Warn("prompt_injection_detected",
			"pattern", w.PatternName,
			"severity", w.Severity,
			"matched", w.Matched,
			"sender", senderID,
			"room", roomID,
		)
	}

	return result.Output, result.Rejected
}

// resolveDataBase returns the base directory for agent runtime data.
// Priority: config storage.base_path > $AGENTS_DATA_DIR/<id> > agents/<id>/data
func resolveDataBase(cfg *config.AgentConfig) string {
	if cfg.Storage.BasePath != "" {
		return cfg.Storage.BasePath
	}
	if envDir := os.Getenv("AGENTS_DATA_DIR"); envDir != "" {
		return filepath.Join(envDir, cfg.Agent.ID)
	}
	return filepath.Join("agents", cfg.Agent.ID, "data")
}

// buildToolRegistry creates a Registry with tools enabled in the agent's config.
func buildToolRegistry(
	cfg *config.AgentConfig,
	sshExec *ssh.Executor,
	matrixClient *matrix.Client,
	memStore memory.Store,
	kStore *shellknowledge.FileStore,
	sharedKStore *shellknowledge.FileStore,
	mcpManager *shellmcp.Manager,
	roomCtx *toolmemory.RoomContext,
	logger *slog.Logger,
) *tools.Registry {
	reg := tools.NewRegistry(logger)

	if cfg.Tools.HTTP.Enabled {
		reg.Register(toolhttp.NewHTTPGet(cfg.Tools.HTTP))
		reg.Register(toolhttp.NewHTTPPost(cfg.Tools.HTTP))
		logger.Debug("registered http tools")
	}

	if cfg.Tools.SSH.Enabled {
		reg.Register(toolssh.NewSSHCommand(cfg.Tools.SSH, sshExec))
		logger.Debug("registered ssh tool")
	}

	if cfg.Tools.FileOps.Enabled {
		reg.Register(toolfile.NewReadFile(cfg.Tools.FileOps))
		logger.Debug("registered file tool")
	}

	// current_time is always available
	reg.Register(toolclock.NewCurrentTime())
	logger.Debug("registered current_time tool")

	// weather tool is always available
	reg.Register(toolweather.NewWeather())
	logger.Debug("registered weather tool")

	// matrix_send is always available
	reg.Register(toolmatrix.NewMatrixSend(matrixClient, cfg.Tools.Matrix))
	logger.Debug("registered matrix tool")

	// Memory tools (memory_clear_context registered later since it needs the Agent)
	if cfg.Tools.Memory.Enabled && memStore != nil {
		reg.Register(toolmemory.NewMemorySave(cfg.Agent.ID, memStore))
		reg.Register(toolmemory.NewMemoryRecall(cfg.Agent.ID, memStore))
		reg.Register(toolmemory.NewMemoryForget(cfg.Agent.ID, memStore))
		reg.Register(toolmemory.NewMemorySummary(cfg.Agent.ID, memStore))
		logger.Debug("registered memory tools")
	}

	// Knowledge tools
	if cfg.Tools.Knowledge.Enabled && kStore != nil {
		reg.Register(toolknowledge.NewKnowledgeSearch(kStore))
		reg.Register(toolknowledge.NewKnowledgeRead(kStore))
		reg.Register(toolknowledge.NewKnowledgeWrite(kStore))
		reg.Register(toolknowledge.NewKnowledgeList(kStore))
		logger.Debug("registered knowledge tools")
	}

	// Shared knowledge tools
	if cfg.Tools.SharedKnowledge.Enabled && sharedKStore != nil {
		sharedTools := toolknowledge.NewSharedKnowledgeTools(sharedKStore)
		for _, tool := range sharedTools {
			reg.Register(tool)
		}
		logger.Debug("registered shared knowledge tools", "count", len(sharedTools))
	}

	// MCP tools — register tools from all connected MCP servers
	if mcpManager != nil {
		for serverName, mcpClient := range mcpManager.AllClients() {
			// Find the config for this server to get prefix, filter, timeout
			var serverCfg *config.MCPServerCfg
			for i := range cfg.Tools.MCP.Servers {
				if cfg.Tools.MCP.Servers[i].Name == serverName {
					serverCfg = &cfg.Tools.MCP.Servers[i]
					break
				}
			}
			if serverCfg == nil {
				logger.Warn("no config found for MCP server", "name", serverName)
				continue
			}

			// Convert and register MCP tools
			mcpTools := toolmcp.FromMCPServer(mcpClient, serverCfg.Prefix, serverCfg.Tools, serverCfg.Timeout, logger)
			for _, tool := range mcpTools {
				reg.Register(tool)
			}
			logger.Debug("registered MCP tools", "server", serverName, "count", len(mcpTools))
		}
	}

	return reg
}