package main

import (
	"fmt"
	"time"

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

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

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

type Command struct {
	key         string
	description string
}

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

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

	return nil
}

func (screen *AboutScreen) handleKeyEvent(event termbox.Event) int {
	return ScreenMain
}

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 _, cmd := range commands {
		termboxUtil.DrawStringAtPoint(fmt.Sprintf("%6s", cmd.key), xPos, yPos, DefaultFg, DefaultBg)
		termboxUtil.DrawStringAtPoint(cmd.description, xPos+8, yPos, DefaultFg, DefaultBg)
		yPos++
	}
}