package web

import "sync"

// State holds the last rendered report table and row count produced by the
// upload handler. The web app is single-user and in-memory, but net/http runs
// handlers concurrently, so reads and writes are guarded by an RWMutex.
type State struct {
	mu    sync.RWMutex
	table string
	rows  int
}

// NewState returns an empty State with no rendered table.
func NewState() *State {
	return &State{}
}

// Set replaces the stored rendered table string and row count.
func (s *State) Set(table string, rows int) {
	s.mu.Lock()
	defer s.mu.Unlock()
	s.table = table
	s.rows = rows
}

// Get returns the current rendered table string and row count. The returned
// values are zero-valued when no upload has happened yet.
func (s *State) Get() (string, int) {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.table, s.rows
}