// Command launcher starts one or more agents from their config files.
//
// Usage:
//
//	go run ./cmd/launcher                              # auto-discovers agents/*/config.yaml
//	go run ./cmd/launcher -c agents/assistant/config.yaml
package main

import (
	"context"
	"log/slog"
	"os"
	"os/signal"
	"path/filepath"
	"sync"
	"syscall"

	"github.com/spf13/cobra"

	"github.com/enmanuel/agents/agents"
	assistantagent "github.com/enmanuel/agents/agents/assistant"
	asistente2agent "github.com/enmanuel/agents/agents/asistente2"
	devopsagent "github.com/enmanuel/agents/agents/devops"
	"github.com/enmanuel/agents/internal/config"
	"github.com/enmanuel/agents/pkg/decision"
)

// rulesRegistry maps agent IDs to their rule factories.
// Add a new entry here when you create a new agent package.
var rulesRegistry = map[string]func() []decision.Rule{
	"assistant-bot": assistantagent.Rules,
	"asistente-2":   asistente2agent.Rules,
	"devops-bot":    devopsagent.Rules,
}

func main() {
	var (
		configPaths []string
		logLevel    string
	)

	root := &cobra.Command{
		Use:   "launcher",
		Short: "Start Matrix agents from config files",
		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
			if len(configPaths) == 0 {
				matches, _ := filepath.Glob("agents/*/config.yaml")
				configPaths = matches
			}
			return nil
		},
		RunE: func(cmd *cobra.Command, args []string) error {
			logger := newLogger(logLevel)

			if len(configPaths) == 0 {
				logger.Warn("no agent configs found — nothing to start")
				return nil
			}

			ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
			defer stop()

			var wg sync.WaitGroup
			for _, path := range configPaths {
				path := path
				cfg, err := config.Load(path)
				if err != nil {
					logger.Error("failed to load config", "path", path, "err", err)
					continue
				}
				if !cfg.Agent.Enabled {
					logger.Info("agent disabled, skipping", "id", cfg.Agent.ID)
					continue
				}

				rules := rulesFor(cfg.Agent.ID, logger)
				agentLogger := logger.With("agent", cfg.Agent.ID)

				a, err := agents.New(cfg, rules, agentLogger)
				if err != nil {
					logger.Error("failed to create agent", "id", cfg.Agent.ID, "err", err)
					continue
				}

				wg.Add(1)
				go func() {
					defer wg.Done()
					agentLogger.Info("agent running")
					if err := a.Run(ctx); err != nil {
						agentLogger.Error("agent stopped with error", "err", err)
					}
				}()
			}

			wg.Wait()
			logger.Info("all agents stopped")
			return nil
		},
	}

	root.Flags().StringSliceVarP(&configPaths, "config", "c", nil,
		"Agent config file(s). If omitted, discovers all agents/*/config.yaml")
	root.Flags().StringVar(&logLevel, "log-level", "info",
		"Log level: debug | info | warn | error")

	if err := root.Execute(); err != nil {
		os.Exit(1)
	}
}

func rulesFor(agentID string, logger *slog.Logger) []decision.Rule {
	factory, ok := rulesRegistry[agentID]
	if !ok {
		logger.Warn("no rules registered for agent, using empty ruleset", "id", agentID)
		return nil
	}
	return factory()
}

func newLogger(level string) *slog.Logger {
	var lvl slog.Level
	switch level {
	case "debug":
		lvl = slog.LevelDebug
	case "warn":
		lvl = slog.LevelWarn
	case "error":
		lvl = slog.LevelError
	default:
		lvl = slog.LevelInfo
	}
	return slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: lvl}))
}