package storage

import (
	"sort"
	"sync"

	"github.com/maxence-charriere/go-app/v9/pkg/app"
)

const (
	ContactsKey = "saltyim-contacts"
)

type Contacts interface {
	Add(addr string)
	Remove(addr string)
	List() []string
}

type contacts struct {
	state StateOperations
	lock  *sync.Mutex
}

func readContacts(state StateOperations) map[string]interface{} {
	contacts := make(map[string]interface{})
	state.GetState(ContactsKey, &contacts)
	return contacts
}
func updateContacts(state StateOperations, contacts map[string]interface{}) {
	state.SetState(ContactsKey, contacts, app.Persist, app.Encrypt)
}

func (c *contacts) Add(addr string) {
	c.lock.Lock()
	defer c.lock.Unlock()
	contacts := readContacts(c.state)
	contacts[addr] = true
	updateContacts(c.state, contacts)
}

func (c *contacts) Remove(addr string) {
	c.lock.Lock()
	defer c.lock.Unlock()
	contacts := make(map[string]interface{})
	c.state.GetState(ContactsKey, &contacts)
	delete(contacts, addr)
	updateContacts(c.state, contacts)
}

func (c *contacts) List() []string {
	c.lock.Lock()
	defer c.lock.Unlock()
	contacts := readContacts(c.state)
	var result []string
	for s := range contacts {
		result = append(result, s)
	}
	sort.Strings(result)
	return result
}

func ContactsLocalStorage(state StateOperations) Contacts {
	return &contacts{state: state, lock: &sync.Mutex{}}
}