package gui

import (
	"math"
	"sync"
	"time"

	"github.com/jesseduffield/gocui"
)

func (gui *Gui) scrollUpMain() error {
	mainView := gui.Views.Main
	mainView.Autoscroll = false
	ox, oy := mainView.Origin()
	newOy := int(math.Max(0, float64(oy-gui.Config.UserConfig.Gui.ScrollHeight)))
	return mainView.SetOrigin(ox, newOy)
}

func (gui *Gui) scrollDownMain() error {
	mainView := gui.Views.Main
	mainView.Autoscroll = false
	ox, oy := mainView.Origin()

	reservedLines := 0
	if !gui.Config.UserConfig.Gui.ScrollPastBottom {
		_, sizeY := mainView.Size()
		reservedLines = sizeY
	}

	totalLines := mainView.ViewLinesHeight()
	if oy+reservedLines >= totalLines {
		return nil
	}

	return mainView.SetOrigin(ox, oy+gui.Config.UserConfig.Gui.ScrollHeight)
}

func (gui *Gui) scrollLeftMain(g *gocui.Gui, v *gocui.View) error {
	mainView := gui.Views.Main
	ox, oy := mainView.Origin()
	newOx := int(math.Max(0, float64(ox-gui.Config.UserConfig.Gui.ScrollHeight)))

	return mainView.SetOrigin(newOx, oy)
}

func (gui *Gui) scrollRightMain(g *gocui.Gui, v *gocui.View) error {
	mainView := gui.Views.Main
	ox, oy := mainView.Origin()

	content := mainView.ViewBufferLines()
	var largestNumberOfCharacters int
	for _, txt := range content {
		if len(txt) > largestNumberOfCharacters {
			largestNumberOfCharacters = len(txt)
		}
	}

	sizeX, _ := mainView.Size()
	if ox+sizeX >= largestNumberOfCharacters {
		return nil
	}

	return mainView.SetOrigin(ox+gui.Config.UserConfig.Gui.ScrollHeight, oy)
}

func (gui *Gui) autoScrollMain(g *gocui.Gui, v *gocui.View) error {
	gui.Views.Main.Autoscroll = true
	return nil
}

func (gui *Gui) jumpToTopMain(g *gocui.Gui, v *gocui.View) error {
	gui.Views.Main.Autoscroll = false
	_ = gui.Views.Main.SetOrigin(0, 0)
	_ = gui.Views.Main.SetCursor(0, 0)
	return nil
}

func (gui *Gui) onMainTabClick(tabIndex int) error {
	gui.Log.Warn(tabIndex)

	currentSidePanel, ok := gui.currentSidePanel()

	if !ok {
		return nil
	}

	currentSidePanel.SetMainTabIndex(tabIndex)
	return currentSidePanel.HandleSelect()
}

func (gui *Gui) handleEnterMain(g *gocui.Gui, v *gocui.View) error {
	mainView := gui.Views.Main
	mainView.ParentView = v

	return gui.switchFocus(mainView)
}

func (gui *Gui) handleExitMain(g *gocui.Gui, v *gocui.View) error {
	v.ParentView = nil
	return gui.returnFocus()
}

func (gui *Gui) handleMainClick() error {
	if gui.popupPanelFocused() {
		return nil
	}

	currentView := gui.g.CurrentView()

	if currentView.Name() != "main" {
		gui.Views.Main.ParentView = currentView
	}

	return gui.switchFocus(gui.Views.Main)
}

var (
	mouseTimerMutex sync.Mutex
	mouseTimer      *time.Timer
	mouseTicker     *time.Ticker
	mouseTicksLeft  int
)

func (gui *Gui) handleToggleMouse() error {
	mouseTimerMutex.Lock()
	defer mouseTimerMutex.Unlock()

	if gui.g.Mouse {
		// Disable Mouse
		gui.g.Mouse = false
		gocui.Screen.DisableMouse()

		if mouseTimer != nil {
			mouseTimer.Stop()
		}
		if mouseTicker != nil {
			mouseTicker.Stop()
		}

		mouseTicksLeft = 15
		mouseTimer = time.AfterFunc(15*time.Second, func() {
			gui.g.Update(func(g *gocui.Gui) error {
				mouseTimerMutex.Lock()
				defer mouseTimerMutex.Unlock()

				if !gui.g.Mouse {
					gui.g.Mouse = true
					gocui.Screen.EnableMouse()
					if mouseTicker != nil {
						mouseTicker.Stop()
					}
					_ = gui.renderString(gui.g, "information", gui.getInformationContent())
				}
				return nil
			})
		})

		mouseTicker = time.NewTicker(1 * time.Second)
		go func() {
			for range mouseTicker.C {
				gui.g.Update(func(g *gocui.Gui) error {
					mouseTimerMutex.Lock()
					defer mouseTimerMutex.Unlock()

					if gui.g.Mouse {
						return nil
					}
					mouseTicksLeft--
					if mouseTicksLeft <= 0 {
						if mouseTicker != nil {
							mouseTicker.Stop()
						}
						return nil
					}
					_ = gui.renderString(gui.g, "information", gui.getInformationContent())
					return nil
				})
			}
		}()

	} else {
		// Enable Mouse manually
		gui.g.Mouse = true
		gocui.Screen.EnableMouse()

		if mouseTimer != nil {
			mouseTimer.Stop()
		}
		if mouseTicker != nil {
			mouseTicker.Stop()
		}
	}

	_ = gui.renderString(gui.g, "information", gui.getInformationContent())
	return nil
}