package frontend

import (
	"fmt"
	"html/template"
	"log"
	"net/http"
	"os"
	"time"

	"github.com/google/uuid"
	b "streifling.com/jason/cpolis/cmd/backend"
)

func PublishLatestIssue(c *b.Config, db *b.DB, s map[string]*Session) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		session, err := ManageSession(w, r, c, s)
		if err != nil {
			http.Error(w, "Die Session ist abgelaufen. Bitte erneut anmelden.", http.StatusUnauthorized)
			return
		}

		article := &b.Article{
			Title:         r.PostFormValue("issue-title"),
			BannerLink:    r.PostFormValue("issue-banner-url"),
			Published:     true,
			Rejected:      false,
			Created:       time.Now(),
			AutoGenerated: true,
			UUID:          uuid.New(),
		}

		if len(article.Title) == 0 {
			http.Error(w, "Bitte den Titel eingeben.", http.StatusBadRequest)
			return
		}

		article.ID, err = db.AddArticle(article)
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		authorIDs := make([]int64, 1)
		authorIDs[0] = session.User.ID

		if err = db.WriteArticleAuthors(article.ID, authorIDs); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		content := []byte(r.PostFormValue("issue-content"))
		if len(content) == 0 {
			http.Error(w, "Bitte eine Beschreibung eingeben.", http.StatusBadRequest)
			return
		}

		articleAbsName := fmt.Sprint(c.ArticleDir, "/", article.UUID, ".md")
		if err = os.WriteFile(articleAbsName, content, 0644); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if err = db.AddArticleToCurrentIssue(article.ID); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if err := db.PublishLatestIssue(); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		feed, err := b.GenerateAtomFeed(c, db)
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		if err = b.SaveAtomFeed(c.AtomFile, feed); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		data := new(struct{ Role int })
		data.Role = session.User.Role

		tmpl, err := template.ParseFiles(c.WebDir + "/templates/hub.html")
		tmpl = template.Must(tmpl, err)
		if err = tmpl.ExecuteTemplate(w, "page-content", data); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
	}
}