// Command launcher starts one or more agents from their config files.
package main

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

	"github.com/spf13/cobra"

	"github.com/enmanuel/agents/agents"
	"github.com/enmanuel/agents/internal/config"
	"github.com/enmanuel/agents/pkg/decision"
)

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

	root := &cobra.Command{
		Use:   "launcher",
		Short: "Start Matrix agents from config files",
		RunE: func(cmd *cobra.Command, args []string) error {
			level := slog.LevelInfo
			if logLevel == "debug" {
				level = slog.LevelDebug
			}
			logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level}))

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

			var wg sync.WaitGroup
			for _, path := range configPaths {
				path := path // capture
				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
				}

				// Load agent-specific rules (extend here with your own rule builders)
				rules := loadRulesForAgent(cfg)

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

				wg.Add(1)
				go func() {
					defer wg.Done()
					if err := agent.Run(ctx); err != nil {
						logger.Error("agent stopped", "id", cfg.Agent.ID, "err", err)
					}
				}()
			}

			wg.Wait()
			return nil
		},
	}

	root.Flags().StringSliceVarP(&configPaths, "config", "c", nil, "Agent config files (comma-separated or repeated flag)")
	root.Flags().StringVar(&logLevel, "log-level", "info", "Log level: debug|info|warn|error")

	// Default: discover all config.yaml files under agents/
	root.PersistentPreRunE = func(cmd *cobra.Command, args []string) error {
		if len(configPaths) == 0 {
			matches, _ := filepath.Glob("agents/*/config.yaml")
			configPaths = matches
		}
		return nil
	}

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

// loadRulesForAgent returns the decision rules for a given agent config.
// Extend this function (or use a registry) to wire up agent-specific rules.
func loadRulesForAgent(cfg *config.AgentConfig) []decision.Rule {
	return []decision.Rule{
		{
			Name:  "help",
			Match: decision.MatchCommand("help"),
			Actions: []decision.Action{{
				Kind: decision.ActionKindReply,
				Reply: &decision.ReplyAction{
					Content: "I'm " + cfg.Agent.Name + ". " + cfg.Agent.Description,
				},
			}},
		},
	}
}