package main

import (
	//	"encoding/json"
	"fmt"
	"log"
	"math"
	"time"

	"github.com/Arman92/go-tdlib"
)

var (
	ownUserID64 = int64(0)
	ownUserID32 = int32(0)
	chtwrsID64  = int64(408101137)
)

func main() {

	tdlib.SetLogVerbosityLevel(1)
	tdlib.SetFilePath("./errors.txt")

	// Create new instance of client
	client := tdlib.NewClient(tdlib.Config{
		APIID:               "187786",
		APIHash:             "e782045df67ba48e441ccb105da8fc85",
		SystemLanguageCode:  "en",
		DeviceModel:         "ChatWarsExport",
		SystemVersion:       "0.1",
		ApplicationVersion:  "0.1",
		UseMessageDatabase:  true,
		UseFileDatabase:     true,
		UseChatInfoDatabase: true,
		UseTestDataCenter:   false,
		DatabaseDirectory:   "./tdlib-db",
		FileDirectory:       "./tdlib-files",
		IgnoreFileNames:     false,
	})

	for {
		currentState, _ := client.Authorize()
		if currentState.GetAuthorizationStateEnum() == tdlib.AuthorizationStateWaitPhoneNumberType {
			fmt.Print("Enter phone: ")
			var number string
			fmt.Scanln(&number)
			_, err := client.SendPhoneNumber(number)
			logOnError(err, "Error sending phone number.")
		} else if currentState.GetAuthorizationStateEnum() == tdlib.AuthorizationStateWaitCodeType {
			fmt.Print("Enter code: ")
			var code string
			fmt.Scanln(&code)
			_, err := client.SendAuthCode(code)
			logOnError(err, "Error sending auth code.")
		} else if currentState.GetAuthorizationStateEnum() == tdlib.AuthorizationStateWaitPasswordType {
			fmt.Print("Enter Password: ")
			var password string
			fmt.Scanln(&password)
			_, err := client.SendAuthPassword(password)
			logOnError(err, "Error sending auth password.")
		} else if currentState.GetAuthorizationStateEnum() == tdlib.AuthorizationStateReadyType {
			fmt.Println("Authorization Ready! Let's rock")
			break
		}
		time.Sleep(1 * time.Second)
	}

	ownUserID32 = OwnUserID(client)
	ownUserID64 = int64(OwnUserID(client))

	go ListenMe(client)

	fmt.Println("Sleep 10sec..")

	time.Sleep(10 * time.Second)

	fmt.Println("Getting history...")

	getHistory(client, &chtwrsID64)

}

func getHistory(c *tdlib.Client, chatID64 *int64) {
	var msgCount int32 = 0
	var msgParsed int32 = 0
	var loopOverflow int32 = 0
	var lastParsedID64 int64 = int64(math.MaxInt64)
	var lastParsedTime time.Time = time.Now()
	var m ChatWarsMessage
	var chat int64

	chat = *chatID64

	fmt.Printf("Getting details for chatID64 %d ...\n", chat)

	chatDetails, err := c.GetChat(chat)
	failOnError(err, "getHistory : GetChat")
	fmt.Printf("Exporting historic messages for chat %d (%s) ...\n", chat, chatDetails.Title)

	for lastParsedID64 >= 0 {
		prevLastParsedID64 := lastParsedID64
		msgs, err := c.GetChatHistory(chat, lastParsedID64, 0, 99, false)
		if err != nil {
			if err.Error() == "timeout" {
				logOnError(err, "Waiting....")
				fmt.Printf("Timeout  : %d messages retrieved out of %d dating back %s (%d) ...\n", msgCount, msgParsed, lastParsedTime.Format(time.RFC3339), lastParsedID64)
				time.Sleep(5 * time.Second)
			} else {
				logOnError(err, "Cannot get history")
				lastParsedID64 = -1
			}
		} else if msgs.TotalCount > 0 {
			for _, msg := range msgs.Messages {
				msgParsed = msgParsed + 1
				lastParsedTime = time.Unix(int64(msg.Date), 0)
				switch msg.Content.GetMessageContentEnum() {
				case tdlib.MessageTextType:
					if msg.ForwardInfo == nil {
						m = ChatWarsMessage{
							TGUserID64:       ownUserID64,
							TGSenderUserID64: int64(msg.SenderUserID),
							ID64:             msg.ID,
							ChatID64:         msg.ChatID,
							Text:             msg.Content.(*tdlib.MessageText).Text.Text,
						}
						m.Date = time.Unix(int64(msg.Date), 0)
					} else {
						if msg.ForwardInfo.GetMessageForwardInfoEnum() == tdlib.MessageForwardedFromUserType {
							m = ChatWarsMessage{
								TGUserID64:       int64(msg.SenderUserID),
								TGSenderUserID64: int64(msg.ForwardInfo.(*tdlib.MessageForwardedFromUser).SenderUserID),
								ID64:             msg.ID,
								ChatID64:         0,
								Text:             msg.Content.(*tdlib.MessageText).Text.Text,
							}
							m.Date = time.Unix(int64(msg.ForwardInfo.(*tdlib.MessageForwardedFromUser).Date), 0)

						} else {
							m = ChatWarsMessage{
								ID64: 0,
							}
						}
					}

					if m.ID64 != 0 {
						// export msg here
						msgCount = msgCount + 1
					}
				default:
					log.Printf("getHistory(%d) : no handler for %s\n", msg.ID, msg.Content.GetMessageContentEnum())
				}
				if m.ID64 < lastParsedID64 {
					lastParsedID64 = msg.ID
					lastParsedTime = m.Date
				}
				if msgParsed%1000 == 0 {
					fmt.Printf("Waiting  : %d messages retrieved out of %d dating back %s (%d) ...\n", msgCount, msgParsed, lastParsedTime.Format(time.RFC3339), lastParsedID64)
				}

			}
		} else {
			lastParsedID64 = -1
		}
		if prevLastParsedID64 == lastParsedID64 {
			loopOverflow++
			if loopOverflow == 5 {
				// we should be at the end !
				lastParsedID64 = -1
			} else {
				logOnError(err, "Overflow ...")
				fmt.Printf("Overflow : %d messages retrieved out of %d dating back %s (%d) ...\n", msgCount, msgParsed, lastParsedTime.Format(time.RFC3339), lastParsedID64)
				time.Sleep(5 * time.Second)
			}
		} else {
			loopOverflow = 0
		}
	}
	log.Printf("Exported %d messages.\n", msgCount)
	fmt.Printf("Exported %d messages.\n", msgCount)
}

func OwnUserID(c *tdlib.Client) int32 {
	user, _ := c.GetMe()
	return user.ID
}

func ListenMe(c *tdlib.Client) {
	eventFilter := func(msg *tdlib.TdMessage) bool {
		updateMsg := (*msg).(*tdlib.UpdateNewMessage)
		senderUserID := updateMsg.Message.SenderUserID
		if senderUserID == ownUserID32 {
			return true
		} else {
			return false
		}
	}

	receiver := c.AddEventReceiver(&tdlib.UpdateNewMessage{}, eventFilter, 100)
	for _ = range receiver.Chan {
		log.Printf("ListenMe : updated.\n")
	}
}