/*
  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"
	"math"
	"os"
	"os/exec"
	"time"
)

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

var (
	workTimer       string
	shortBreakTimer string
	longBreakTimer  string
	maxWorkCycles   int
	printVersion    bool
)

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

func main() {

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

	initNotifier()

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

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

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

	pominal := NewPominal(
		workTimeDuration,
		shortBreakTimeDuration,
		longBreakTimeDuration,
		maxWorkCycles,
	)

	pominal.Run()
}

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