package handler

import (
	"net/http"
	"os"
	"path/filepath"
	"regexp"

	"podstalk/store"
)

var slugRe = regexp.MustCompile(`^[a-z0-9]+(-[a-z0-9]+)*$`)

type SettingsHandler struct {
	Store     *store.Store
	UploadDir string
}

func (h *SettingsHandler) ServeSettings(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	userID := UserIDFromContext(r)
	user, err := h.Store.GetUser(userID)
	if err != nil {
		http.Redirect(w, r, "/", http.StatusSeeOther)
		return
	}

	if err := r.ParseMultipartForm(10 << 20); err != nil {
		http.Redirect(w, r, "/?error=file+too+large", http.StatusSeeOther)
		return
	}

	title := r.FormValue("podcast_title")
	if title == "" {
		title = user.PodcastTitle
	}

	slug := r.FormValue("podcast_slug")
	if slug == "" {
		slug = user.PodcastSlug
	}
	if slug != "" {
		if !slugRe.MatchString(slug) {
			http.Redirect(w, r, "/?error=slug+must+be+lowercase+letters+numbers+and+hyphens", http.StatusSeeOther)
			return
		}
		taken, err := h.Store.SlugTaken(slug, userID)
		if err != nil {
			http.Redirect(w, r, "/?error=internal+error", http.StatusSeeOther)
			return
		}
		if taken {
			http.Redirect(w, r, "/?error=slug+already+taken", http.StatusSeeOther)
			return
		}
	}

	author := r.FormValue("podcast_author")
	if author == "" {
		author = user.PodcastAuthor
	}

	image := user.PodcastImage

	// Handle podcast image upload
	file, header, err := r.FormFile("podcast_image")
	if err == nil {
		defer file.Close()

		if image != "" {
			os.Remove(filepath.Join(h.UploadDir, image))
		}

		catDir := filepath.Join(h.UploadDir, "images")
		os.MkdirAll(catDir, 0755)

		ext := filepath.Ext(header.Filename)
		if ext == "" {
			ext = ".png"
		}
		dst, err := os.Create(filepath.Join(catDir, "podcast"+ext))
		if err == nil {
			defer dst.Close()
			dst.ReadFrom(file)
			image = "images/podcast" + ext
		}
	}

	h.Store.UpdateUserPodcast(userID, title, slug, image, author)
	http.Redirect(w, r, "/?success=podcast+settings+saved", http.StatusSeeOther)
}