package ui

import (
	"fmt"

	"git.bullercodeworks.com/brian/wandle"
	"github.com/nsf/termbox-go"
	"github.com/spf13/viper"
)

const (
	ABT_CmdGotoBrowse = AboutId | iota
)

type AboutMsg struct {
	source int
	data   interface{}
	err    error
}

type aboutScreen struct {
	ui *Ui

	commands1 []Command
	commands2 []Command
}

type Command struct {
	key         string
	description string
}

func NewAboutScreen(u *Ui) *aboutScreen { return &aboutScreen{ui: u} }

func (s *aboutScreen) Init() wandle.Cmd {
	s.commands1 = []Command{
		{"h,←", "close parent"},
		{"j,↓", "down"},
		{"k,↑", "up"},
		{"l,→", "open item"},
		{"J", "scroll right pane down"},
		{"K", "scroll right pane up"},
		{"", ""},
		{"g", "goto top"},
		{"G", "goto bottom"},
		{"", ""},
		{"ctrl+f", "jump down"},
		{"ctrl+b", "jump up"},
	}

	s.commands2 = []Command{
		{"p,P", "create pair/at parent"},
		{"b,B", "create bucket/at parent"},
		{"e", "edit value of pair"},
		{"r", "rename pair/bucket"},
		{"", ""},
		{"", ""},
		{"D", "delete item"},
		{"x,X", "export as string/json to file"},
		{"", ""},
		{"?", "this screen"},
		{"q", "quit program"},
	}
	return nil
}

func (s *aboutScreen) Update(msg wandle.Msg) wandle.Cmd {
	switch msg := msg.(type) {
	case AboutMsg:
		return s.handleAboutMsg(msg)
	case termbox.Event:
		return s.handleTermboxEvent(msg)
	}
	return nil
}

func (s *aboutScreen) handleAboutMsg(msg AboutMsg) wandle.Cmd {
	switch msg.source {
	case ABT_CmdGotoBrowse:
		return wandle.SwitchScreenCmd(s.ui.browseScreen)
	}
	return nil
}

func (s *aboutScreen) handleTermboxEvent(msg termbox.Event) wandle.Cmd {
	if msg.Type == termbox.EventKey {
		return wandle.SwitchScreenCmd(s.ui.browseScreen)
	}
	return nil
}

func (s *aboutScreen) View(style wandle.Style) {
	width, height := termbox.Size()
	template := [...]string{
		" _______  _______  ___    _______  _______  ______    _______  _     _  _______  _______  ______   ",
		"|  _    ||       ||   |  |       ||  _    ||    _ |  |       || | _ | ||       ||       ||    _ |  ",
		"| |_|   ||   _   ||   |  |_     _|| |_|   ||   | ||  |   _   || || || ||  _____||    ___||   | ||  ",
		"|       ||  | |  ||   |    |   |  |       ||   |_||_ |  | |  ||       || |_____ |   |___ |   |_||_ ",
		"|  _   | |  |_|  ||   |___ |   |  |  _   | |    __  ||  |_|  ||       ||_____  ||    ___||    __  |",
		"| |_|   ||       ||       ||   |  | |_|   ||   |  | ||       ||   _   | _____| ||   |___ |   |  | |",
		"|_______||_______||_______||___|  |_______||___|  |_||_______||__| |__||_______||_______||___|  |_|",
	}
	if width < 100 {
		template = [...]string{
			" ____  ____  _   _____  ____  ____   ____  _     _  ____  ___  ____   ",
			"|  _ ||    || | |     ||  _ ||  _ | |    || | _ | ||    ||   ||  _ |  ",
			"| |_||| _  || | |_   _|| |_||| | || | _  || || || || ___||  _|| | ||  ",
			"|    ||| | || |   | |  |    || |_|| || | ||       |||___ | |_ | |_||_ ",
			"|  _ |||_| || |___| |  |  _ ||  _  |||_| ||       ||__  ||  _||  __  |",
			"| |_|||    ||     | |  | |_||| | | ||    ||   _   | __| || |_ | |  | |",
			"|____||____||_____|_|  |____||_| |_||____||__| |__||____||___||_|  |_|",
		}
	}
	firstLine := template[0]
	startX := (width - len(firstLine)) / 2
	//startX := (width - len(firstLine)) / 2
	startY := ((height - 2*len(template)) / 2) - 2
	xPos := startX
	yPos := startY
	if height <= 20 {
		title := "BoltBrowser"
		startY = 0
		yPos = 0
		wandle.Print((width-len(title))/2, startY, style, title)
	} else {
		if height < 25 {
			startY = 0
			yPos = 0
		}
		for _, line := range template {
			xPos = startX
			for _, runeValue := range line {
				displayRune := ' '
				if runeValue != ' ' {
					displayRune = runeValue
					termbox.SetCell(xPos, yPos, displayRune, style.Foreground, style.Background)
				}
				xPos++
			}
			yPos++
		}
	}
	yPos++
	versionString := fmt.Sprintf("Version: %0.1f", viper.GetFloat64("version"))
	wandle.Print((width-len(versionString))/2, yPos, style, versionString)
	var maxCmd1 int
	for k := range s.commands1 {
		tst := len(s.commands1[k].key) + 1 + len(s.commands1[k].description)
		if tst > maxCmd1 {
			maxCmd1 = tst
		}
	}
	var maxCmd2 int
	for k := range s.commands2 {
		tst := len(s.commands2[k].key) + 1 + len(s.commands2[k].description)
		if tst > maxCmd2 {
			maxCmd2 = tst
		}
	}
	xPos = (width / 2) - ((maxCmd1 + maxCmd2) / 2)
	yPos++

	for k, cmd := range s.commands1 {
		wandle.Print(xPos, yPos+1+k, style, fmt.Sprintf("%6s  %s", cmd.key, cmd.description))
	}
	for k, cmd := range s.commands2 {
		wandle.Print(xPos+40, yPos+1+k, style, fmt.Sprintf("%6s  %s", cmd.key, cmd.description))
	}
	exitTxt := "Press any key to return to browser"
	st := style.Bold(true)
	wandle.Print((width-len(exitTxt))/2, height-1, st, exitTxt)
}