package main

import (
	"fmt"
	"time"

	"github.com/br0xen/termbox-screen"
	"github.com/br0xen/termbox-util"
	termbox "github.com/nsf/termbox-go"
)

const AboutScreenId = 2

// AboutScreen holds all that's going on
type AboutScreen struct {
	message        string
	messageTimeout time.Duration
	messageTime    time.Time

	titleTemplate []string
	commandsCol1  []Command
	commandsCol2  []Command
}

type Command struct {
	key         string
	description string
}

func (screen *AboutScreen) Id() int { return AboutScreenId }

func (screen *AboutScreen) Initialize(bundle termboxScreen.Bundle) error {
	screen.titleTemplate = []string{
		"                      __    ",
		"   _________    _____|  | __",
		"  / ___\\__  \\  /  ___/  |/ /",
		" / /_/  > __ \\_\\___ \\|    < ",
		" \\___  (____  /____  >__|_ \\",
		"/_____/     \\/     \\/     \\/",
	}

	screen.commandsCol1 = []Command{
		Command{"j,↓", "down"},
		Command{"k,↑", "up"},
		Command{"l,→", "open task"},
		Command{"[space]", "toggle task complete"},
		Command{"g", "goto top"},
		Command{"G", "goto bottom"},
		Command{"ctrl+f", "jump down"},
		Command{"ctrl+b", "jump up"},
	}
	screen.commandsCol2 = []Command{
		Command{"D", "move task to done.txt"},
		Command{"?", "this screen"},
		Command{"q", "quit program"},
	}

	return nil
}
func (screen *AboutScreen) ResizeScreen() { screen.Initialize(nil) }

func (screen *AboutScreen) HandleKeyEvent(event termbox.Event) int {
	return MainScreenId
}

func (screen *AboutScreen) DrawScreen() {
	width, height := termbox.Size()
	xPos := (width - len(screen.titleTemplate[0])) / 2
	yPos := 1
	for _, line := range screen.titleTemplate {
		termboxUtil.DrawStringAtPoint(line, xPos, yPos, DefaultFg, DefaultBg)
		yPos++
	}

	numCols := 2
	if width < 80 {
		numCols = 1
	}
	col1XPos := (width - (width * 3 / 4))
	col2XPos := (width - (width * 2 / 4))
	if numCols == 1 {
		col2XPos = col1XPos
	}
	screen.drawCommandsAtPoint(screen.commandsCol1, col1XPos, yPos)
	screen.drawCommandsAtPoint(screen.commandsCol2, col2XPos, yPos)
	exitTxt := "Press any key to return to tasks"
	termboxUtil.DrawStringAtPoint(exitTxt, (width-len(exitTxt))/2, height-1, TitleFg, TitleBg)
}

func (screen *AboutScreen) drawCommandsAtPoint(commands []Command, x, y int) {
	xPos, yPos := x, y
	for index, cmd := range commands {
		termboxUtil.DrawStringAtPoint(fmt.Sprintf("%6s", cmd.key), xPos, yPos, DefaultFg, DefaultBg)
		termboxUtil.DrawStringAtPoint(cmd.description, xPos+8, yPos, DefaultFg, DefaultBg)
		yPos++
		if index > 2 && index%2 == 1 {
			yPos++
		}
	}
}