package main

import (
	"context"
	"encoding/json"
	"log"
	"os"
	"os/signal"
	"strings"
	"syscall"

	"SimpleArmaAdmin/internal/crypto"
	"SimpleArmaAdmin/internal/nats"
	"github.com/nats-io/nats.go/jetstream"
)

// DiscordBot represents the central provider-managed bot
type DiscordBot struct {
	natsClient  *nats.Client
	managedKeys map[string][]byte // communityID -> decrypted master key (in-memory vault)
}

// Event represents a game event from NATS
type Event struct {
	Type      string `json:"Type"`
	Content   string `json:"Content"`
	Raw       string `json:"Raw"`
	Timestamp string `json:"Timestamp"`
}

func main() {
	natsURL := os.Getenv("NATS_URL")
	if natsURL == "" {
		natsURL = "nats://localhost:4222"
	}

	// TODO: Load Discord token from environment
	// discordToken := os.Getenv("DISCORD_TOKEN")

	nc, err := nats.Connect(natsURL)
	if err != nil {
		log.Fatalf("Could not connect to NATS: %v", err)
	}
	defer nc.Close()

	bot := &DiscordBot{
		natsClient:  nc,
		managedKeys: make(map[string][]byte),
	}

	log.Println("Discord Bot starting (Managed Trust Mode)")

	// TODO: Load managed keys from database (encrypted with provider's key)
	// For now, use a hardcoded demo key
	bot.managedKeys["comm-123-abc"] = []byte("this-is-a-32-byte-master-key-xyz")

	ctx := context.Background()

	// Subscribe to NATS logs stream
	stream, err := nc.JS.Stream(ctx, "LOGS")
	if err != nil {
		log.Fatalf("Stream 'LOGS' not found: %v", err)
	}

	consumer, err := stream.CreateOrUpdateConsumer(ctx, jetstream.ConsumerConfig{
		Durable:   "discord_bot",
		AckPolicy: jetstream.AckExplicitPolicy,
	})
	if err != nil {
		log.Fatalf("Failed to create consumer: %v", err)
	}

	iter, err := consumer.Messages()
	if err != nil {
		log.Fatal(err)
	}

	// Process messages
	go func() {
		for {
			msg, err := iter.Next()
			if err != nil {
				log.Printf("Iterator error: %v", err)
				return
			}

			// Extract community ID from subject (e.g., "logs.comm-123-abc.live")
			subjectParts := strings.Split(msg.Subject(), ".")
			if len(subjectParts) < 2 {
				msg.Ack()
				continue
			}

			communityID := subjectParts[1]

			// Check if we have a managed key for this community
			masterKey, exists := bot.managedKeys[communityID]
			if !exists {
				// No managed trust granted, skip
				msg.Ack()
				continue
			}

			// Decrypt the log in RAM (zero-knowledge breach: temporary only!)
			decrypted, err := crypto.Decrypt(msg.Data(), masterKey)
			if err != nil {
				log.Printf("Decryption failed for %s: %v", communityID, err)
				msg.Ack()
				continue
			}

			// Parse the event
			var event Event
			if err := json.Unmarshal(decrypted, &event); err != nil {
				log.Printf("Failed to parse event: %v", err)
				msg.Ack()
				continue
			}

			// Send to Discord
			bot.sendToDiscord(communityID, &event)

			msg.Ack()
		}
	}()

	// Wait for shutdown signal
	sig := make(chan os.Signal, 1)
	signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
	<-sig

	log.Println("Discord Bot shutting down")
}

func (b *DiscordBot) sendToDiscord(communityID string, event *Event) {
	// TODO: Implement actual Discord webhook/bot message sending
	// For now, just log it
	log.Printf("[Discord] [%s] [%s] %s", communityID, event.Type, event.Content)

	// Example Discord embed structure:
	// {
	//   "embeds": [{
	//     "title": "Player Join",
	//     "description": "Mike1Delta connected to server",
	//     "color": 3066993,
	//     "timestamp": "2026-04-30T12:00:00Z"
	//   }]
	// }
}