/*
  Pominal
  Copyright (C) 2019  Daniel Anglin

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package main

import (
	"flag"
	"fmt"
	"os"
	"os/exec"
	"time"
)

const (
	workTimerLabel       string = "Work"
	shortBreakTimerLabel string = "Short break"
	longBreakTimerLabel  string = "Long break"
)

var (
	workTime        string
	shortBreakTime  string
	longBreakTime   string
	maxWorkSessions int
	printVersion    bool
)

func init() {
	flag.StringVar(&workTime, "work", "25m", "sets the timer for your work session.")
	flag.StringVar(&shortBreakTime, "short-break", "5m", "sets the timer for your short break.")
	flag.StringVar(&longBreakTime, "long-break", "20m", "sets the timer for your long break.")
	flag.IntVar(&maxWorkSessions, "max-work-sessions", 4, "sets the maximum number of work cycles to complete before taking a long break.")
	flag.BoolVar(&printVersion, "version", false, "print version and exit.")
}

func main() {
	flag.Parse()

	if printVersion {
		Version()
		os.Exit(0)
	}

	initNotifier()

	w, err := time.ParseDuration(workTime)
	if err != nil {
		fmt.Printf("ERROR: Unable to set the work timer. %s", err.Error())
		os.Exit(1)
	}

	s, err := time.ParseDuration(shortBreakTime)
	if err != nil {
		fmt.Printf("ERROR: Unable to set the work timer. %s", err.Error())
		os.Exit(1)
	}

	l, err := time.ParseDuration(longBreakTime)
	if err != nil {
		fmt.Printf("ERROR: Unable to set the work timer. %s", err.Error())
		os.Exit(1)
	}

	pominal := NewPominal(
		w.Seconds(),
		s.Seconds(),
		l.Seconds(),
		maxWorkSessions,
	)

	pominal.Run()
}

// printScreen prints the details of the Pominal session on screen including
// the current work session number, the timer's current label and the current countdoen.
// TODO: To be removed when TUI is implemented.
func printScreen(countdown float64, pominalCount, workSessionCount, maxWorkSession int, label string) {
	clearScreen()
	fmt.Printf("Pominal cycle: %d\nWork session: %d of %d\n\n", pominalCount, workSessionCount, maxWorkSession)
	fmt.Printf("Session: %s\nTime remaining: %02d:%02d", label, int(countdown)/60, int(countdown)%60)
}

// clearScreen clears the terminal screen
// TODO: To be removed when TUI is implemented
func clearScreen() {
	cmd := exec.Command("clear")
	cmd.Stdout = os.Stdout
	cmd.Run()
}