package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"sort"
	"strings"

	"github.com/br0xen/user-config"
)

const (
	AppName    = "gocal"
	AppVersion = 1
)

type AppState struct {
	Name         string
	Version      int
	ClientSecret []byte
	cfg          *userConfig.Config
	account      *Account
}

var state *AppState

func main() {
	var err error
	var op string
	state = &AppState{Name: AppName, Version: AppVersion}
	state.cfg, err = userConfig.NewConfig(state.Name)

	if err != nil {
		panic(err)
	}

	if len(os.Args) > 1 {
		op = os.Args[1]
		switch os.Args[1] {
		case "--reinit":
		}
	} else {
		op = "today"
	}

	DoVersionCheck()

	switch op {
	case "--reinit":
		// Reset all config
		for _, v := range state.cfg.GetKeyList() {
			fmt.Println("Deleting Key: " + v)
			state.cfg.DeleteKey(v)
		}
	case "today":
		// Show everything on the calendar for today
		InitComm()
		// TODO: Get calendars flagged as default
		list := state.account.GetCalendarList()
		var todayEvents []Event
		if len(list) > 0 {
			for i := range list {
				if list[i].Deleted {
					// Deleted calendar, next please
					continue
				}
				todayEvents = append(todayEvents, list[i].GetTodaysEvents()...)
			}
			sort.Sort(ByStartTime(todayEvents))
			for _, e := range todayEvents {
				if e.GetStartTime() == "00:00:00" {
					fmt.Println("[All Day ]  " + e.Summary)
				} else {
					fmt.Println("[" + e.GetStartTime() + "]  " + e.Summary)
				}
			}
		} else {
			fmt.Printf("No calendars found.\n")
		}

	case "defaults":
		// Show Defaults
		InitComm()

	case "add":
		// Quick event add to primary calendar
		quickAddText := strings.Join(os.Args[2:], " ")
		e, err := state.account.GetDefaultCalendar().QuickAdd(quickAddText)
		if err != nil {
			fmt.Println(err.Error())
		} else {
			fmt.Println(e.ToCLIString())
		}
	case "bail":
		// Just initialize communications and bail
		InitComm()
	}

	//fmt.Println("\n-====-\n")

	/*
		t := time.Now().Format(time.RFC3339)
		events, err := srv.Events.List("primary").ShowDeleted(false).
			SingleEvents(true).TimeMin(t).MaxResults(10).OrderBy("startTime").Do()
		if err != nil {
			log.Fatalf("Unable to retrieve next ten of the user's events. %v", err)
		}

		fmt.Println("Upcoming events:")
		if len(events.Items) > 0 {
			for _, i := range events.Items {
				var when string
				// If the DateTime is an empty string the Event is an all-day Event.
				// So only Date is available.
				if i.Start.DateTime != "" {
					when = i.Start.DateTime
				} else {
					when = i.Start.Date
				}
				fmt.Printf("%s (%s)\n", i.Summary, when)
			}
		} else {
			fmt.Printf("No upcoming events found.\n")
		}
	*/
}

func InitComm() {
	var err error
	sec := state.cfg.GetBytes("ClientSecret")
	tkn := state.cfg.GetBytes("Token")

	state.account, err = GetAccount(sec, tkn)
	if err != nil {
		log.Fatalf("Unable to get Account: %v", err)
	}

	// Save the Raw Token
	state.cfg.SetBytes("Token", state.account.CC.GetRawToken())

	// If the 'defaultCalendars' cfg is set to 'primary', we need to actually but the primary cal id in there
	var defCal []string
	defCal, err = state.cfg.GetArray("defaultCalendars")
	if len(defCal) == 0 || (len(defCal) == 1 && defCal[0] == "primary") {
		gCal, err := state.account.Service.CalendarList.Get("primary").Do()
		if err == nil {
			state.cfg.SetArray("defaultCalendars", []string{gCal.Id})
		}
	}
}

func DoVersionCheck() {
	confVer, _ := state.cfg.GetInt("version")
	for confVer < state.Version {
		// Update from confVer to state.Version
		switch confVer {
		case 0: // Initializing the app
			fmt.Println("Initializing gocal")
			for {
				fmt.Println("Client Secret Filename (Ctrl-C to exit): ")
				var fn string
				if _, err := fmt.Scan(&fn); err == nil {
					var b []byte
					b, err = ioutil.ReadFile(fn)
					if len(b) > 0 && err == nil {
						state.cfg.SetBytes("ClientSecret", b)
						break
					}
				}
			}
			state.cfg.SetInt("version", 1)
			state.cfg.SetArray("defaultCalendars", []string{"primary"})
		}
		state.ClientSecret = state.cfg.GetBytes("ClientSecret")
		// Refetch the version from the config
		confVer, _ = state.cfg.GetInt("version")
	}
}