package main

import (
	"fmt"
	"log"
	"os"
	"os/signal"
	"strings"
	"syscall"
	"time"

	"github.com/1440news/commons"
)

func main() {
	fmt.Println("Starting publisher service...")

	// Open database connection
	db, err := commons.OpenDatabase("")
	if err != nil {
		log.Fatalf("Failed to connect to database: %v", err)
	}
	defer db.Close()

	// Load PDS configuration
	pdsHost := os.Getenv("PDS_HOST")
	if pdsHost == "" {
		pdsHost = "https://pds.1440.news"
	}

	feedPassword := os.Getenv("FEED_PASSWORD")
	if feedPassword == "" {
		feedPassword = "feed1440!"
	}

	// Create publisher service
	pub := NewPublisherService(db, pdsHost, feedPassword)

	// Start HTTP server
	go func() {
		if err := pub.StartServer("0.0.0.0:4322"); err != nil {
			log.Fatalf("Server error: %v", err)
		}
	}()

	// Start publish loop
	go pub.StartPublishLoop()

	fmt.Printf("Publisher service running (PDS: %s)\n", pdsHost)

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

	fmt.Println("Shutting down publisher service...")
}

// loadEnvFile loads environment variables from a file (e.g., pds.env)
func loadEnvFile(filename string) {
	data, err := os.ReadFile(filename)
	if err != nil {
		return // File doesn't exist or can't be read
	}

	for _, line := range strings.Split(string(data), "\n") {
		line = strings.TrimSpace(line)
		if line == "" || strings.HasPrefix(line, "#") {
			continue
		}

		parts := strings.SplitN(line, "=", 2)
		if len(parts) == 2 {
			key := strings.TrimSpace(parts[0])
			value := strings.TrimSpace(parts[1])
			if os.Getenv(key) == "" {
				os.Setenv(key, value)
			}
		}
	}
}

// PublisherService manages publishing items to AT Protocol PDS
type PublisherService struct {
	db           *commons.DB
	publisher    *Publisher
	pdsHost      string
	feedPassword string
}

// NewPublisherService creates a new publisher service
func NewPublisherService(db *commons.DB, pdsHost, feedPassword string) *PublisherService {
	return &PublisherService{
		db:           db,
		publisher:    NewPublisher(pdsHost),
		pdsHost:      pdsHost,
		feedPassword: feedPassword,
	}
}

// StartPublishLoop runs the automatic publishing loop
func (s *PublisherService) StartPublishLoop() {
	ticker := time.NewTicker(5 * time.Minute)
	defer ticker.Stop()

	// Run immediately on start
	s.publishPendingItems()

	for range ticker.C {
		s.publishPendingItems()
	}
}

// publishPendingItems publishes unpublished items for all enabled feeds
func (s *PublisherService) publishPendingItems() {
	// Get all feeds with publish_status = 'pass'
	rows, err := s.db.Query(`
		SELECT url, publish_account
		FROM feeds
		WHERE publish_status = 'pass' AND publish_account IS NOT NULL
	`)
	if err != nil {
		fmt.Printf("Publish loop: query error: %v\n", err)
		return
	}
	defer rows.Close()

	var feeds []struct {
		URL     string
		Account string
	}

	for rows.Next() {
		var url, account string
		if err := rows.Scan(&url, &account); err != nil {
			continue
		}
		feeds = append(feeds, struct {
			URL     string
			Account string
		}{url, account})
	}

	if len(feeds) == 0 {
		return
	}

	fmt.Printf("Publish loop: checking %d feeds\n", len(feeds))

	for _, feed := range feeds {
		s.publishFeedItems(feed.URL, feed.Account)
	}
}

// publishFeedItems publishes unpublished items for a single feed
func (s *PublisherService) publishFeedItems(feedURL, account string) {
	// Get unpublished items (limit to 5 per cycle to avoid overwhelming)
	items, err := s.GetUnpublishedItems(feedURL, 5)
	if err != nil || len(items) == 0 {
		return
	}

	// Authenticate with the feed account
	session, err := s.publisher.CreateSession(account, s.feedPassword)
	if err != nil {
		fmt.Printf("Publish: auth failed for %s: %v\n", account, err)
		return
	}

	for _, item := range items {
		uri, err := s.publisher.PublishItem(session, item)
		if err != nil {
			fmt.Printf("Publish: failed to publish %s: %v\n", item.GUID, err)
			continue
		}

		if err := s.MarkItemPublished(item.FeedURL, item.GUID, uri); err != nil {
			fmt.Printf("Publish: failed to mark published %s: %v\n", item.GUID, err)
		}

		// Small delay between posts
		time.Sleep(1100 * time.Millisecond)
	}
}

// GetUnpublishedItems returns unpublished items for a feed (only items with status='pass')
func (s *PublisherService) GetUnpublishedItems(feedURL string, limit int) ([]*commons.Item, error) {
	rows, err := s.db.Query(`
		SELECT feed_url, guid, title, link, description, content, author, pub_date, discovered_at, updated_at,
			enclosure_url, enclosure_type, enclosure_length, image_urls, tags,
			status, published_at, published_uri
		FROM items
		WHERE feed_url = $1 AND published_at IS NULL AND status = 'pass'
		ORDER BY pub_date ASC
		LIMIT $2
	`, feedURL, limit)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	return scanItems(rows)
}

// MarkItemPublished marks an item as published with the given URI
func (s *PublisherService) MarkItemPublished(feedURL, guid, uri string) error {
	_, err := s.db.Exec(`
		UPDATE items SET published_at = NOW(), published_uri = $1 WHERE feed_url = $2 AND guid = $3
	`, uri, feedURL, guid)
	return err
}