package main

import (
	"fmt"
	"net/http"
	"strings"
	"time"

	"github.com/gorilla/feeds"
	"github.com/russross/blackfriday/v2"
)

func generateAtomFeed(w http.ResponseWriter, blogs []Blog, siteURL string) {
	feed := &feeds.Feed{
		Title:       "Spitfire News",
		Link:        &feeds.Link{Href: siteURL},
		Description: "Blog about Spitfire browser news/updates.", // Blog subtitle (Atom uses "subtitle" for description)
		Author:      &feeds.Author{Name: "Internet Addict", Email: "noone@none.no"},
		Created:     time.Now(),
	}

	// Add self link
	feed.Link = &feeds.Link{Href: fmt.Sprintf("%s/rss", siteURL), Rel: "self"}

	for _, blog := range blogs {
		for _, entry := range blog.Entries {
			// Convert Markdown content to HTML
			htmlContent := blackfriday.Run([]byte(entry.Content))

			// Ensure all image paths are absolute URLs (Idiot proofing)
			absoluteContent := strings.ReplaceAll(string(htmlContent), "src=\"/", fmt.Sprintf("src=\"%s/", siteURL))

			// Ensure unique and stable ID
			entryID := fmt.Sprintf("%s/%s/%d", siteURL, blog.Name, entry.Number)

			// Create a summary if needed (using the first 200 characters of the content, for example)
			summary := entry.Description
			if summary == "" {
				if len(entry.Content) > 200 {
					summary = entry.Content[:200] + "..."
				} else {
					summary = entry.Content
				}
			}

			feed.Items = append(feed.Items, &feeds.Item{
				Title:       entry.Title,
				Link:        &feeds.Link{Href: entryID, Rel: "alternate"},
				Description: summary, // This can be used as the summary
				Author:      &feeds.Author{Name: entry.Author},
				Id:          entryID,
				Updated:     entry.Date,
				Content:     absoluteContent,
			})
		}
	}

	// Generate Atom feed with the correct content-type and charset
	w.Header().Set("Content-Type", "application/atom+xml; charset=UTF-8")
	atom, err := feed.ToAtom()
	if err != nil {
		http.Error(w, "Error generating Atom feed", http.StatusInternalServerError)
		return
	}

	w.Write([]byte(atom))
}

func generateBlogAtomFeed(w http.ResponseWriter, blog Blog, siteURL string) {
	feed := &feeds.Feed{
		Title:       blog.Name,
		Link:        &feeds.Link{Href: fmt.Sprintf("%s/%s", siteURL, blog.Name)},
		Description: blog.Name, // Blog subtitle (Atom uses "subtitle" for description)
		Author:      &feeds.Author{Name: "Internet Addict", Email: "noone@none.no"},
		Created:     time.Now(),
	}

	// Add self link
	feed.Link = &feeds.Link{Href: fmt.Sprintf("%s/%s/rss", siteURL, blog.Name), Rel: "self"}

	for _, entry := range blog.Entries {
		// Convert Markdown content to HTML
		htmlContent := blackfriday.Run([]byte(entry.Content))

		// Ensure all image paths are absolute URLs (Idiot proofing)
		absoluteContent := strings.ReplaceAll(string(htmlContent), "src=\"/", fmt.Sprintf("src=\"%s/", siteURL))

		// Ensure unique and stable ID
		entryID := fmt.Sprintf("%s/%s/%d", siteURL, blog.Name, entry.Number)

		// Create a summary if needed (using the first 200 characters of the content, for example)
		summary := entry.Description
		if summary == "" {
			if len(entry.Content) > 200 {
				summary = entry.Content[:200] + "..."
			} else {
				summary = entry.Content
			}
		}

		feed.Items = append(feed.Items, &feeds.Item{
			Title:       entry.Title,
			Link:        &feeds.Link{Href: entryID, Rel: "alternate"},
			Description: summary, // This can be used as the summary
			Author:      &feeds.Author{Name: entry.Author},
			Id:          entryID,
			Updated:     entry.Date,
			Content:     absoluteContent,
		})
	}

	// Generate Atom feed with the correct content-type and charset
	w.Header().Set("Content-Type", "application/atom+xml; charset=UTF-8")
	atom, err := feed.ToAtom()
	if err != nil {
		http.Error(w, "Error generating Atom feed", http.StatusInternalServerError)
		return
	}

	w.Write([]byte(atom))
}