package handlers

import (
	"net/http"

	"warpbox.dev/backend/libs/services"
	"warpbox.dev/backend/libs/web"
)

type homeData struct {
	MaxUploadSize string
	LimitSummary  string
	Collections   []collectionView
	IsAdmin       bool
	AnonymousOpen bool
}

func (a *App) Home(w http.ResponseWriter, r *http.Request) {
	currentUser := a.currentPublicUser(r)
	var collections []collectionView
	var isAdmin bool
	var user services.User
	var loggedIn bool
	if current, ok := a.currentUser(r); ok {
		user = current
		loggedIn = true
		isAdmin = user.Role == services.UserRoleAdmin
		userCollections, err := a.authService.ListCollections(user.ID)
		if err == nil {
			collections = make([]collectionView, 0, len(userCollections))
			for _, collection := range userCollections {
				collections = append(collections, collectionView{ID: collection.ID, Name: collection.Name})
			}
		}
	}
	settings, err := a.settingsService.UploadPolicy()
	if err != nil {
		http.Error(w, "unable to load upload policy", http.StatusInternalServerError)
		return
	}
	maxUploadSize, limitSummary := a.homeUploadPolicyLabels(settings, user, loggedIn, isAdmin)
	a.renderPage(w, r, http.StatusOK, "home.html", web.PageData{
		Title:       "Upload your files",
		Description: "Upload and share files through a self-hosted Warpbox instance.",
		CurrentUser: currentUser,
		Data: homeData{
			MaxUploadSize: maxUploadSize,
			LimitSummary:  limitSummary,
			Collections:   collections,
			IsAdmin:       isAdmin,
			AnonymousOpen: settings.AnonymousUploadsEnabled,
		},
	})
}

func (a *App) homeUploadPolicyLabels(settings services.UploadPolicySettings, user services.User, loggedIn, isAdmin bool) (string, string) {
	if isAdmin {
		return "No file size limit", "Admin uploads bypass storage and daily caps."
	}
	if !loggedIn {
		if !settings.AnonymousUploadsEnabled {
			return "Anonymous uploads disabled", "Sign in to upload files."
		}
		return services.FormatMegabytesLabel(settings.AnonymousMaxUploadMB), "Daily anonymous cap: " + services.FormatMegabytesLabel(settings.AnonymousDailyUploadMB) + " per IP."
	}
	quotaMB := settings.DefaultUserStorageMB
	if user.StorageQuotaMB != nil {
		quotaMB = *user.StorageQuotaMB
	}
	return a.uploadService.MaxUploadSizeLabel(), "Daily cap: " + services.FormatMegabytesLabel(settings.UserDailyUploadMB) + " · Storage quota: " + services.FormatMegabytesLabel(quotaMB) + "."
}