package controllers_pages

import (
	"main/mvc/models"
	"main/mvc/models/models_pages"
	"net/http"
	"path"
	"strconv"
)

// Обработчик странички со списком постов
func PostsPageHandler(app *models.App) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		link := r.URL.Path
		cacheKey := link

		ajax := r.URL.Query().Get("ajax") == "true"
		if ajax {
			cacheKey += "?ajax=true"
		}

		if pageData, ok := app.PagesCache.Get(cacheKey); ok {
			sendPostsPage(w, pageData)
			return
		}

		postsList := app.PostsMap.PostsList()
		pageNumber, _ := strconv.Atoi(path.Base(link))
		page := models_pages.CreatePostsPage(postsList, pageNumber, app.Cfg.PostsMaxCountOnPage)

		var (
			pageData []byte
			err      error
		)

		pageData, err = page.RenderPostsPage(app.Templates, app.Version, ajax)

		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		app.PagesCache.Set(cacheKey, pageData)
		sendPostsPage(w, pageData)
	}
}

// Отправляет страницу
func sendPostsPage(w http.ResponseWriter, data []byte) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	w.Write(data)
}