//go:build darwin

package application

/*
#cgo CFLAGS: -mmacosx-version-min=10.13 -x objective-c
#cgo LDFLAGS: -framework Cocoa -framework WebKit

#include "Cocoa/Cocoa.h"
#include "menuitem_darwin.h"
#include "systemtray_darwin.h"
*/
import "C"
import (
	"unsafe"

	"github.com/leaanthony/go-ansi-parser"
)

type macosSystemTray struct {
	id    uint
	label string
	icon  []byte
	menu  *Menu

	nsStatusItem   unsafe.Pointer
	nsImage        unsafe.Pointer
	nsMenu         unsafe.Pointer
	iconPosition   int
	isTemplateIcon bool
	parent         *SystemTray
}

func (s *macosSystemTray) openMenu() {
	if s.nsMenu == nil {
		return
	}
	C.showMenu(s.nsStatusItem, s.nsMenu)
}

type button int

const (
	leftButtonDown  button = 1
	rightButtonDown button = 3
)

// system tray map
var systemTrayMap = make(map[uint]*macosSystemTray)

//export systrayClickCallback
func systrayClickCallback(id C.long, buttonID C.int) {
	// Get the system tray
	systemTray := systemTrayMap[uint(id)]
	if systemTray == nil {
		globalApplication.error("system tray not found", "id", id)
		return
	}
	systemTray.processClick(button(buttonID))
}

func (s *macosSystemTray) setIconPosition(position int) {
	s.iconPosition = position
}

func (s *macosSystemTray) setMenu(menu *Menu) {
	s.menu = menu
}

func (s *macosSystemTray) positionWindow(window *WebviewWindow, offset int) error {

	// Get the trayBounds of this system tray
	trayBounds, err := s.bounds()
	if err != nil {
		return err
	}

	// Get the current screen trayBounds
	currentScreen, err := s.getScreen()
	if err != nil {
		return err
	}
	screenBounds := currentScreen.Bounds

	// Get the center height of the window
	windowWidthCenter := window.Width() / 2

	// Get the center height of the system tray
	systemTrayWidthCenter := trayBounds.Width / 2

	// The Y will be 0 and the X will make the center of the window line up with the center of the system tray
	windowX := trayBounds.X + systemTrayWidthCenter - windowWidthCenter

	// If the end of the window goes off-screen, move it back enough to be on screen
	if windowX+window.Width() > screenBounds.Width {
		windowX = screenBounds.Width - window.Width()
	}
	window.SetRelativePosition(windowX, int(C.statusBarHeight())+offset)

	return nil
}

func (s *macosSystemTray) getScreen() (*Screen, error) {
	return getScreenForSystray(s)
}

func (s *macosSystemTray) bounds() (*Rect, error) {
	var rect C.NSRect
	C.systemTrayGetBounds(s.nsStatusItem, &rect)
	// Get the screen height for the screen that the systray is on
	screen, err := getScreenForSystray(s)
	if err != nil {
		return nil, err
	}

	// Invert Y axis based on screen height
	rect.origin.y = C.double(screen.Bounds.Height) - rect.origin.y - rect.size.height

	return &Rect{
		X:      int(rect.origin.x),
		Y:      int(rect.origin.y),
		Width:  int(rect.size.width),
		Height: int(rect.size.height),
	}, nil
}

func (s *macosSystemTray) run() {
	globalApplication.dispatchOnMainThread(func() {
		if s.nsStatusItem != nil {
			Fatal("System tray '%d' already running", s.id)
		}
		s.nsStatusItem = unsafe.Pointer(C.systemTrayNew(C.long(s.id)))

		if s.label != "" {
			s.setLabel(s.label)
		}
		if s.icon != nil {
			s.nsImage = unsafe.Pointer(C.imageFromBytes((*C.uchar)(&s.icon[0]), C.int(len(s.icon))))
			C.systemTraySetIcon(s.nsStatusItem, s.nsImage, C.int(s.iconPosition), C.bool(s.isTemplateIcon))
		}
		if s.menu != nil {
			s.menu.Update()
			// Convert impl to macosMenu object
			s.nsMenu = (s.menu.impl).(*macosMenu).nsMenu
		}
	})
}

func (s *macosSystemTray) setIcon(icon []byte) {
	s.icon = icon
	globalApplication.dispatchOnMainThread(func() {
		s.nsImage = unsafe.Pointer(C.imageFromBytes((*C.uchar)(&icon[0]), C.int(len(icon))))
		C.systemTraySetIcon(s.nsStatusItem, s.nsImage, C.int(s.iconPosition), C.bool(s.isTemplateIcon))
	})
}

func (s *macosSystemTray) setDarkModeIcon(icon []byte) {
	s.setIcon(icon)
}

func (s *macosSystemTray) setTemplateIcon(icon []byte) {
	s.icon = icon
	s.isTemplateIcon = true
	globalApplication.dispatchOnMainThread(func() {
		s.nsImage = unsafe.Pointer(C.imageFromBytes((*C.uchar)(&icon[0]), C.int(len(icon))))
		C.systemTraySetIcon(s.nsStatusItem, s.nsImage, C.int(s.iconPosition), C.bool(s.isTemplateIcon))
	})
}

func newSystemTrayImpl(s *SystemTray) systemTrayImpl {
	result := &macosSystemTray{
		parent:         s,
		id:             s.id,
		label:          s.label,
		icon:           s.icon,
		menu:           s.menu,
		iconPosition:   s.iconPosition,
		isTemplateIcon: s.isTemplateIcon,
	}
	systemTrayMap[s.id] = result
	return result
}

func extractAnsiTextParts(text *ansi.StyledText) (label *C.char, fg *C.char, bg *C.char) {
	label = C.CString(text.Label)
	if text.FgCol != nil {
		fg = C.CString(text.FgCol.Hex)
	}
	if text.BgCol != nil {
		bg = C.CString(text.BgCol.Hex)
	}
	return
}

func (s *macosSystemTray) setLabel(label string) {
	s.label = label
	if !ansi.HasEscapeCodes(label) {
		C.systemTraySetLabel(s.nsStatusItem, C.CString(label))
	} else {
		parsed, err := ansi.Parse(label)
		if err != nil {
			C.systemTraySetLabel(s.nsStatusItem, C.CString(label))
			return
		}
		if len(parsed) == 0 {
			return
		}
		label, fg, bg := extractAnsiTextParts(parsed[0])
		var attributedString = C.createAttributedString(label, fg, bg)
		if len(parsed) > 1 {
			for _, parsedPart := range parsed[1:] {
				label, fg, bg = extractAnsiTextParts(parsedPart)
				attributedString = C.appendAttributedString(attributedString, label, fg, bg)
			}
		}

		C.systemTraySetANSILabel(s.nsStatusItem, attributedString)
	}
}

func (s *macosSystemTray) destroy() {
	// Remove the status item from the status bar and its associated menu
	C.systemTrayDestroy(s.nsStatusItem)
}

func (s *macosSystemTray) processClick(b button) {
	switch b {
	case leftButtonDown:
		// Check if we have a callback
		if s.parent.clickHandler != nil {
			s.parent.clickHandler()
			return
		}
		if s.parent.attachedWindow.Window != nil {
			s.parent.defaultClickHandler()
			return
		}
		if s.menu != nil {
			C.showMenu(s.nsStatusItem, s.nsMenu)
		}
	case rightButtonDown:
		// Check if we have a callback
		if s.parent.rightClickHandler != nil {
			s.parent.rightClickHandler()
			return
		}
		if s.menu != nil {
			if s.parent.attachedWindow.Window != nil {
				s.parent.attachedWindow.Window.Hide()
			}
			C.showMenu(s.nsStatusItem, s.nsMenu)
			return
		}
		if s.parent.attachedWindow.Window != nil {
			s.parent.defaultClickHandler()
		}
	}
}