package altvr

import (
	"log"
	"net/http/cookiejar"

	"golang.org/x/net/publicsuffix"
)

// XXX: Hold a HTTP CONNECT / Keep-Alive so we show up as online

// AltVR Client Type
type AltVR struct {
	jar               *cookiejar.Jar
	username          string
	password          string
	csrfToken         string // CSRF token for requests
	userID            string // Our own user id
	user              User   // Cache of our own user data
	friends           []User
	friendships       []Friendship
	onlineFriendships []Friendship
}

// DisconnectFunc handler for disconnection
type DisconnectFunc func(User)

// ConnectFunc handler for connection
type ConnectFunc func(User)

// New creates a new instance of the AltVR client
// Takes an account username and password as parameters
func New(u, p string) AltVR {
	avr := AltVR{username: u, password: p}
	var err error
	avr.jar, err = cookiejar.New(&cookiejar.Options{PublicSuffixList: publicsuffix.List})
	if err != nil {
		log.Fatal(err)
	}
	err = avr.doLogin()
	if err != nil {
		log.Fatal(err)
	}
	user, err := avr.fetchMyUser()
	if err != nil {
		log.Fatal(err)
	}
	avr.user = user
	if err := avr.FetchFriendships(); err != nil {
		log.Fatal(err)
	}
	return avr
}

// GetAvatarURL returns the cached user avatar url
func (avr *AltVR) GetAvatarURL() string {
	return avr.user.ProfileImage
}

// FetchMyUser fetches our own user data and cache it
func (avr *AltVR) FetchMyUser() error {
	user, err := avr.fetchMyUser()

	if err == errorLogin {
		log.Println("Not logged in, doing login")
		err = avr.doLogin()
		if err != nil {
			log.Fatal(err)
		}
		user, err = avr.fetchMyUser()
	}
	if err != nil {
		return err
	}
	avr.user = user
	return nil
}

// GetMyUser Returns the cached copy of our user data
func (avr *AltVR) GetMyUser() User {
	return avr.user
}

// FetchClientIP retrives the client IP from the API
func (avr *AltVR) FetchClientIP() (string, error) {
	return avr.fetchClientIP()
}

// FetchFriendships fetches all our friends' user data and caches it
func (avr *AltVR) FetchFriendships() error {
	var err error
	friendships, err := avr.fetchFriendships()
	if err != nil {
		return err
	}
	for _, friendship := range friendships {
		found := false
		for _, ff := range avr.friendships {
			if friendship.FriendID == ff.FriendID {
				found = true
				break
			}
		}
		if !found {
			if err := avr.FetchFriend(friendship.FriendID); err != nil {
				log.Printf("Error fetching friend user data: %+v\n", err)
			}
		}
	}
	avr.friendships = friendships
	return nil
}

// GetFriendships returns the cached list of friendships
func (avr *AltVR) GetFriendships() []Friendship {
	return avr.friendships
}

// FetchOnlineFriendships check for changes in the online friends list
// Triggers the callback functions on dis/connect
func (avr *AltVR) FetchOnlineFriendships(cfn ConnectFunc, dfn DisconnectFunc) error {
	friendships, err := avr.fetchFriendshipsOnline()
	if err != nil {
		return err
	}

	for _, friendship := range friendships {
		found := false
		for _, of := range avr.onlineFriendships {
			if friendship.FriendID == of.FriendID {
				found = true
				break
			}
		}
		if !found {
			if err := avr.FetchFriend(friendship.FriendID); err != nil {
				return err
			}
			cfn(avr.GetFriend(friendship.FriendID))
		}
	}

	for _, friendship := range avr.onlineFriendships {
		found := false
		for _, of := range friendships {
			if friendship.FriendID == of.FriendID {
				found = true
				break
			}
		}
		if !found {
			if err := avr.FetchFriend(friendship.FriendID); err != nil {
				return err
			}
			dfn(avr.GetFriend(friendship.FriendID))
		}
	}

	avr.onlineFriendships = friendships
	return nil
}

// FetchFriend fetches one user's data and update the cache
func (avr *AltVR) FetchFriend(userID string) error {
	users, err := avr.fetchUsers(userID)
	if err != nil {
		return err
	}
	user := users[0]
	found := false
	for k, u := range avr.friends {
		if u.UserID == user.UserID {
			avr.friends[k] = user
			found = true
			break
		}
	}
	if !found {
		avr.friends = append(avr.friends, user)
	}
	return nil
}

// FetchFriends fetches many users' data and update the cache
func (avr *AltVR) FetchFriends(userID ...string) error {
	users, err := avr.fetchUsers(userID...)
	if err != nil {
		return err
	}
	for _, user := range users {
		found := false
		for k, u := range avr.friends {
			if u.UserID == user.UserID {
				avr.friends[k] = user
				found = true
				break
			}
		}
		if !found {
			avr.friends = append(avr.friends, user)
		}
	}
	return nil
}

// GetFriend gets a cached friend user data with the user ID
func (avr *AltVR) GetFriend(userID string) User {
	var user User
	for _, u := range avr.friends {
		if u.UserID == userID {
			user = u
			break
		}
	}
	return user
}

// GetFriendByUsername gets a cached friend user data with the username
func (avr *AltVR) GetFriendByUsername(username string) User {
	var user User
	for _, u := range avr.friends {
		if u.Username == username {
			user = u
			break
		}
	}
	return user
}

// FetchPendingFriendshipRequests fetches a list of pending friendship requests
func (avr *AltVR) FetchPendingFriendshipRequests() ([]Friendship, error) {
	fr, err := avr.fetchPendingFriendshipRequests()
	if err != nil {
		log.Printf("Error fetching pending conversations: %+v\n", err)
		return fr, err
	}
	var uids []string
	for _, ff := range fr {
		uids = append(uids, ff.UserID)
	}
	avr.FetchFriends(uids...)
	return fr, nil
}

// AcceptFriendshipRequest accepts a pending friendship request
func (avr *AltVR) AcceptFriendshipRequest(FriendshipID string) error {
	return avr.acceptPendingFriendshipRequest(FriendshipID)
}

// DenyFriendshipRequest accepts a pending friendship request
func (avr *AltVR) DenyFriendshipRequest(FriendshipID string) error {
	return avr.denyPendingFriendshipRequest(FriendshipID)
}

// FetchPendingConversations fetches any pending conversations
func (avr *AltVR) FetchPendingConversations() ([]Conversation, error) {
	pc, err := avr.fetchPendingConversations()
	if err != nil {
		log.Printf("Error fetching pending conversations: %+v\n", err)
		return pc, err
	}
	var ccs []Conversation
	for _, c := range pc {
		if !c.IsRead {
			ccs = append(ccs, c)
		}
	}
	return ccs, nil
}

// AcknowkledgeConversation mark a conversation item as read
func (avr *AltVR) AcknowkledgeConversation(conversationID string) error {
	return avr.markConversationAsRead(conversationID)
}

// PostNewConversation send a new message
func (avr *AltVR) PostNewConversation(userID, message string) error {
	// XXX: Truncate 140 chars
	return avr.postNewConversation(userID, message)
}