package handlers

import (
	"log"
	"net/http"
	"threadr/models"

	"github.com/gorilla/sessions"
)

func PreferencesHandler(app *App) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		session := r.Context().Value("session").(*sessions.Session)
		userID, ok := session.Values["user_id"].(int)
		if !ok {
			http.Redirect(w, r, app.Config.ThreadrDir+"/login/", http.StatusFound)
			return
		}

		// Handle POST request (saving preferences)
		if r.Method == http.MethodPost {
			// Get form values
			autoSaveDrafts := r.FormValue("auto_save_drafts") == "on"
			markdownPreviewDefault := r.FormValue("markdown_preview_default")

			// Validate markdown_preview_default
			if markdownPreviewDefault != "edit" && markdownPreviewDefault != "preview" {
				markdownPreviewDefault = "edit"
			}

			// Get current preferences (or create if not exists)
			prefs, err := models.GetUserPreferences(app.DB, userID)
			if err != nil {
				log.Printf("Error fetching preferences: %v", err)
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
				return
			}

			// Update preferences
			prefs.AutoSaveDrafts = autoSaveDrafts
			prefs.MarkdownPreviewDefault = markdownPreviewDefault

			err = models.UpdateUserPreferences(app.DB, prefs)
			if err != nil {
				log.Printf("Error updating preferences: %v", err)
				http.Error(w, "Failed to save preferences", http.StatusInternalServerError)
				return
			}

			// Redirect back to preferences page with success
			http.Redirect(w, r, app.Config.ThreadrDir+"/preferences/?saved=true", http.StatusFound)
			return
		}

		// Handle GET request (displaying preferences form)
		prefs, err := models.GetUserPreferences(app.DB, userID)
		if err != nil {
			log.Printf("Error fetching preferences: %v", err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}

		// Check if we should show success message
		showSuccess := r.URL.Query().Get("saved") == "true"

		data := struct {
			PageData
			Preferences *models.UserPreferences
			ShowSuccess bool
		}{
			PageData: PageData{
				Title:            "ThreadR - Preferences",
				Navbar:           "preferences",
				LoggedIn:         true,
				ShowCookieBanner: false,
				BasePath:         app.Config.ThreadrDir,
				StaticPath:       app.Config.ThreadrDir + "/static",
				CurrentURL:       r.URL.Path,
			},
			Preferences: prefs,
			ShowSuccess: showSuccess,
		}

		if err := app.Tmpl.ExecuteTemplate(w, "preferences", data); err != nil {
			log.Printf("Error executing template in PreferencesHandler: %v", err)
			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			return
		}
	}
}