package connections

import (
	"cwtch.im/cwtch/model"
	"cwtch.im/cwtch/protocol"
	"sync"
	"time"
)

// Manager encapsulates all the logic necessary to manage outgoing peer and server connections.
type Manager struct {
	peerConnections   map[string]*PeerPeerConnection
	serverConnections map[string]*PeerServerConnection
	lock              sync.Mutex
	breakChannel      chan bool
}

// NewConnectionsManager creates a new instance of Manager.
func NewConnectionsManager() *Manager {
	m := new(Manager)
	m.peerConnections = make(map[string]*PeerPeerConnection)
	m.serverConnections = make(map[string]*PeerServerConnection)
	m.breakChannel = make(chan bool)
	return m
}

// ManagePeerConnection creates a new PeerConnection for the given Host and Profile.
func (m *Manager) ManagePeerConnection(host string, profile *model.Profile) {
	m.lock.Lock()

	_, exists := m.peerConnections[host]
	if !exists {
		ppc := NewPeerPeerConnection(host, profile)
		go ppc.Run()
		m.peerConnections[host] = ppc
	}
	m.lock.Unlock()

}

// ManageServerConnection creates a new ServerConnection for Host with the given callback handler.
func (m *Manager) ManageServerConnection(host string, handler func(string, *protocol.GroupMessage)) {
	m.lock.Lock()

	_, exists := m.serverConnections[host]
	if !exists {
		psc := NewPeerServerConnection(host)
		go psc.Run()
		psc.GroupMessageHandler = handler
		m.serverConnections[host] = psc
	}
	m.lock.Unlock()
}

// GetPeers returns a map of all peer connections with their state
func (m *Manager) GetPeers() map[string]ConnectionState {
	rm := make(map[string]ConnectionState)
	m.lock.Lock()
	for onion, ppc := range m.peerConnections {
		rm[onion] = ppc.GetState()
	}
	m.lock.Unlock()
	return rm
}

// GetServers returns a map of all server connections with their state.
func (m *Manager) GetServers() map[string]ConnectionState {
	rm := make(map[string]ConnectionState)
	m.lock.Lock()
	for onion, psc := range m.serverConnections {
		rm[onion] = psc.GetState()
	}
	m.lock.Unlock()
	return rm
}

// GetPeerPeerConnectionForOnion safely returns a given peer connection
func (m *Manager) GetPeerPeerConnectionForOnion(host string) (ppc *PeerPeerConnection) {
	m.lock.Lock()
	ppc = m.peerConnections[host]
	m.lock.Unlock()
	return
}

// GetPeerServerConnectionForOnion safely returns a given host connection
func (m *Manager) GetPeerServerConnectionForOnion(host string) (psc *PeerServerConnection) {
	m.lock.Lock()
	psc = m.serverConnections[host]
	m.lock.Unlock()
	return
}

// AttemptReconnections repeatedly attempts to reconnect with failed peers and servers.
func (m *Manager) AttemptReconnections() {
	timeout := time.Duration(0) // first pass right away

	for {
		select {
		case <-time.After(timeout * time.Second):
			m.lock.Lock()
			for _, ppc := range m.peerConnections {
				if ppc.GetState() == FAILED {
					go ppc.Run()
				}
			}
			m.lock.Unlock()

			m.lock.Lock()
			for _, psc := range m.serverConnections {
				if psc.GetState() == FAILED {
					go psc.Run()
				}
			}
			m.lock.Unlock()

			// Launch Another Run In 30 Seconds
			timeout = time.Duration(30)
		case <-m.breakChannel:
			return
		}
	}
}

// ClosePeerConnection closes an existing peer connection
func (m *Manager) ClosePeerConnection(onion string) {
	m.lock.Lock()
	pc, ok := m.peerConnections[onion]
	if ok {
		pc.Close()
		delete(m.peerConnections, onion)
	}
	m.lock.Unlock()
}

func (m *Manager) Shutdown() {
	m.breakChannel <- true
	m.lock.Lock()
	for onion, ppc := range m.peerConnections {
		ppc.Close()
		delete(m.peerConnections, onion)
	}
	for onion, psc := range m.serverConnections {
		psc.Close()
		delete(m.serverConnections, onion)
	}
	m.lock.Unlock()
}