package frontend

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

	b "streifling.com/jason/cpolis/cmd/backend"
)

func PublishLatestIssue(c *b.Config, db *b.DB, s *b.CookieStore) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		session, err := getSession(w, r, c, s)
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		session.Values["article"] = nil
		if err = session.Save(r, w); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		title := r.PostFormValue("issue-title")
		if len(title) == 0 {
			http.Error(w, "Bitte den Titel eingeben.", http.StatusBadRequest)
			return
		}

		if session.Values["issue-image"] == nil {
			http.Error(w, "Bitte ein Bild einfügen.", http.StatusBadRequest)
			return
		}

		imgFileName := session.Values["issue-image"].(string)
		fmt.Println(imgFileName)
		imgAbsName := c.PicsDir + "/" + imgFileName

		imgFile, err := os.Open(imgAbsName)
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		defer imgFile.Close()

		imgInfo, err := imgFile.Stat()
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		article := &b.Article{
			Title:         title,
			EncURL:        c.Domain + "/image/serve/" + imgFileName,
			EncLength:     int(imgInfo.Size()),
			EncType:       mime.TypeByExtension(filepath.Ext(imgAbsName)),
			Published:     true,
			Rejected:      false,
			Created:       time.Now(),
			AuthorID:      session.Values["id"].(int64),
			AutoGenerated: true,
		}

		article.ID, err = db.AddArticle(article)
		if 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.ID, ".md")
		if err = os.WriteFile(articleAbsName, content, 0644); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		article.Link = fmt.Sprint(c.Domain, "/article/serve/", article.ID)
		if err = db.UpdateAttributes(&b.Attribute{Table: "articles", ID: article.ID, AttName: "link", Value: article.Link}); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if err = db.UpdateAttributes(&b.Attribute{Table: "articles", ID: article.ID, AttName: "link", Value: article.Link}); 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.GenerateRSS(c, db)
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		if err = b.SaveRSS(c.RSSFile, feed); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		session.Values["issue-image"] = nil
		if err = session.Save(r, w); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

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

func UploadIssueImage(c *b.Config, s *b.CookieStore) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		session, err := getSession(w, r, c, s)
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		if err := r.ParseMultipartForm(10 << 20); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		file, _, err := r.FormFile("issue-image")
		if err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		defer file.Close()

		filename, err := b.SaveImage(c, file)
		if err != nil {
			if err == b.ErrUnsupportedFormat {
				http.Error(w, "Das Dateiformat wird nicht unterstützt.", http.StatusBadRequest)
				return
			}
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		session.Values["issue-image"] = filename
		if err = session.Save(r, w); err != nil {
			log.Println(err)
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		w.WriteHeader(http.StatusOK)
	}
}