package main

import (
	"net/http"
	"sync"
	"time"

	"github.com/mmcdole/gofeed"
)

// This function was unused and removed to satisfy linter

// rssFeedChecker checks RSS feeds every 15 minutes and adds new articles to the database
func rssFeedChecker(shutdown chan struct{}, ollamaURL, ollamaModel string) {
	logInfo("rss", "Starting RSS feed checker", map[string]interface{}{
		"interval": RSS_CHECK_INTERVAL.String(),
	})

	// Run immediately on startup
	checkRSSFeeds()

	// Then run on interval
	ticker := time.NewTicker(RSS_CHECK_INTERVAL)
	defer ticker.Stop()

	for {
		select {
		case <-ticker.C:
			checkRSSFeeds()
		case <-shutdown:
			logInfo("rss", "Shutting down RSS feed checker", nil)
			return
		}
	}
}

// checkRSSFeeds fetches all RSS feeds and adds new articles to the database
func checkRSSFeeds() {
	articles := loadArticles()
	oldCount := len(articles)

	logInfo("rss", "Checking RSS feeds", map[string]interface{}{
		"time":                time.Now().Format("15:04:05"),
		"articlesBeforeFetch": oldCount,
	})

	now := time.Now()
	newArticles := fetchAllFeedsParallel(now)
	newCount := 0

	for _, a := range newArticles {
		if _, ok := articles[a.Link]; !ok {
			if a.ID == "" {
				a.ID = generateID(a.Link)
			}
			articles[a.Link] = a
			if err := saveArticle(a); err != nil {
				logInfo("rss", "Error saving article", map[string]interface{}{
					"id":    a.ID,
					"error": err.Error(),
				})
			}
			newCount++
			logInfo("new", "Found new article", map[string]interface{}{
				"id":        a.ID,
				"title":     a.Title,
				"source":    a.Source,
				"published": a.Published.Format(time.RFC3339),
			})
		}
	}

	logInfo("rss", "Completed RSS check", map[string]interface{}{
		"articlesBeforeFetch": oldCount,
		"articlesAfterFetch":  oldCount + newCount,
		"newArticles":         newCount,
	})
}

func fetchAllFeedsParallel(now time.Time) []Article {
	type fetchResult struct {
		Source     string
		URL        string
		Feed       *gofeed.Feed
		Err        error
		HTTPStatus int
		Duration   time.Duration
	}

	var wg sync.WaitGroup
	results := make(chan fetchResult, len(feeds))

	for source, url := range feeds {
		wg.Add(1)
		go func(source, url string) {
			defer wg.Done()

			start := time.Now()
			fp := gofeed.NewParser()
			client := &http.Client{Timeout: 20 * time.Second}
			var httpStatus int

			resp, err := client.Get(url)
			var feed *gofeed.Feed
			if err == nil {
				httpStatus = resp.StatusCode
				defer resp.Body.Close()
				feed, err = fp.Parse(resp.Body)
			}

			duration := time.Since(start)

			details := map[string]interface{}{
				"source":   source,
				"url":      url,
				"status":   httpStatus,
				"duration": duration.Seconds(),
			}
			if err != nil {
				details["error"] = err.Error()
			}
			logEvent("rss_fetch_result", details)

			if err != nil {
				logInfo("rss", "Feed fetch failed", map[string]interface{}{
					"source":   source,
					"url":      url,
					"duration": duration.Seconds(),
					"error":    err.Error(),
				})
				results <- fetchResult{Source: source, URL: url, Err: err, Duration: duration, HTTPStatus: httpStatus}
				return
			}

			logInfo("rss", "Feed fetch succeeded", map[string]interface{}{
				"source":   source,
				"url":      url,
				"duration": duration.Seconds(),
				"status":   httpStatus,
				"items":    len(feed.Items),
			})

			results <- fetchResult{
				Source:     source,
				URL:        url,
				Feed:       feed,
				Duration:   duration,
				HTTPStatus: httpStatus,
			}
		}(source, url)
	}

	wg.Wait()
	close(results)

	var all []Article
	for result := range results {
		if result.Err != nil || result.Feed == nil {
			continue
		}
		for _, item := range result.Feed.Items {
			published := now
			// Set published to the current time if not available from feed
			if item.PublishedParsed != nil {
				published = *item.PublishedParsed
			}

			// Set originalDate to the feed's publication date if available
			originalDate := published

			// Skip articles older than 7 days based on the feed's publication date
			cutoffDate := now.AddDate(0, 0, -7) // 7 days ago
			if published.Before(cutoffDate) {
				// Skip this article as it's older than 7 days
				continue
			}

			all = append(all, Article{
				Title:        item.Title,
				Description:  item.Description,
				Link:         item.Link,
				Published:    now,          // When we first saw the article
				OriginalDate: originalDate, // Original publication date from the feed
				Source:       result.Source,
				FirstSeen:    now,
				ID:           generateID(item.Link),
			})
		}
	}
	return all
}