package helper

import (
	"fmt"
	"log"
	"math"
	"os"
	"os/signal"
	"strings"
	"time"

	"github.com/go-vgo/robotgo"
	"gopkg.in/yaml.v3"
)

type Point struct {
	X int
	Y int
}

func (p Point) String() string {
	return fmt.Sprintf("(%v, %v)", p.X, p.Y)
}

func (p Point) Click(button ...string) {
	buttonToClick := "left"
	if len(button) > 0 && (button[0] == "left" || button[0] == "right") {
		buttonToClick = button[0]
	}
	robotgo.Move(p.X, p.Y)
	robotgo.Click(buttonToClick, false)
}

func (p Point) RightClick() {
	p.Click("right")
}

func (p1 *Point) GetDistance(p2 *Point) float64 {
	return math.Sqrt(math.Pow(float64(p1.X-p2.X), float64(2)) + math.Pow(float64(p1.Y-p2.Y), float64(2)))
}

func (p0 *Point) GetDistanceFromClosest(pp ...*Point) float64 {
	var minDistance float64
	for index, p := range pp {
		if distance := p.GetDistance(p0); index == 0 || distance < minDistance {
			minDistance = distance
		}
	}
	return minDistance
}

type PointGroup struct {
	Name   string
	Points []*Point
}

type SavedGroups struct {
	Groups []PointGroup
}

func getSavedGroups(yamlFile string) *SavedGroups {
	s := SavedGroups{}
	inputFile, err := os.ReadFile(yamlFile)
	if err == nil { // No yaml file found
		err = yaml.Unmarshal(inputFile, &s)
		if err != nil {
			log.Fatalf("%v - Exiting", err)
		}
	}
	for index, g := range s.Groups {
		if index == 0 {
			fmt.Println("Available groups:")
		}
		fmt.Printf("%v. %v\n", index+1, g.Name)
	}
	return &s
}

func addSavedGroup(s *SavedGroups) {
	g := PointGroup{}
	var name string
	var points int
	for {
		name = ""
		fmt.Print("If you want to add a new group of locations, enter a name. Press enter to skip.    ")
		fmt.Scanln(&name)
		if name == "" {
			break
		}
		fmt.Printf("How many positions are there in group %v?    ", name)
		_, err := fmt.Scanln(&points)
		if err != nil {
			fmt.Println("I haven't understood, try again...")
			var discard string
			fmt.Scanln(&discard)
			continue
		}
		for i := 0; i < points; i++ {
			fmt.Printf("Please move your mouse into position %v of %v (group %v)\n", i+1, points, name)
			time.Sleep(2 * time.Second)
			x, y := robotgo.GetMousePos()
			fmt.Printf("Added point (x=%v, y=%v) to %v\n", x, y, name)
			p := Point{X: x, Y: y}
			g.Points = append(g.Points, &p)
		}
		g.Name = name
		s.Groups = append(s.Groups, g)
	}
}

func storeSavedGroups(s *SavedGroups, yamlFile string) {
	d, err := yaml.Marshal(s)
	if err != nil {
		log.Fatalf("error: %v", err)
	}
	err = os.WriteFile(yamlFile, d, 0644)
	if err != nil {
		log.Fatalf("error: %v", err)
	}
}

func AbsInt(i int) int {
	if i > 0 {
		return i
	}
	return -i
}

func Oscillator(amplitude int) chan int {
	amplitude--
	c := make(chan int, 1)
	i := amplitude
	go func() {
		for {
			c <- AbsInt((i%(amplitude*2))-amplitude) + 1
			i++
			if i == amplitude*2 {
				i = 0
			}
		}
	}()
	return c
}

func StringOscillator(s string, amplitude int) chan string {
	c := make(chan string)
	o := Oscillator(amplitude)
	go func() {
		for {
			c <- strings.Repeat(s, <-o)
		}
	}()
	return c
}

func press(key string) {
	robotgo.KeyTap(key)
}

func keyboardWrite(s string) {
	robotgo.TypeStr(s)
	robotgo.MilliSleep(100)
}

func ClickRepeatedly(s *SavedGroups, c chan os.Signal) {
	for index, g := range s.Groups {
		fmt.Printf("- Press %v to select %v\n", index+1, g.Name)
	}
	var choice int
	for choice < 1 {
		fmt.Print("Your selection:    ")
		_, err := fmt.Scanln(&choice)
		if err != nil {
			fmt.Println("I haven't understood, try again...")
			var discard string
			fmt.Scanln(&discard)
			continue
		}
		if choice > len(s.Groups) {
			choice = 0
		}
	}
	selection := s.Groups[choice-1]
	fmt.Printf("You selected %v. I'll be clicking in the following positions:\n", selection.Name)
	for index, p := range selection.Points {
		fmt.Printf("%v - %v\n", index+1, p)
	}
	o := StringOscillator(".", 15)
	var t int
	var minDistance float64
	for {
		for _, p := range selection.Points {
			p.Click()
			time.Sleep(100 * time.Millisecond)
		}
		fmt.Println(<-o)
		time.Sleep(500 * time.Millisecond)
		t = 0
		for t = 0; t < 10; t++ {
			x, y := robotgo.GetMousePos()
			currentPosition := Point{X: x, Y: y}
			minDistance = currentPosition.GetDistanceFromClosest(selection.Points...)
			if minDistance <= 50 {
				break
			}
			fmt.Printf("%v You moved the mouse (distance %.2f), waiting 2 seconds (%v of 10)\n", strings.Repeat("_", 10-t), minDistance, t+1)
			time.Sleep(2 * time.Second)
		}
		if t >= 10 {
			fmt.Println("You stayed away too long, exiting...")
			c <- os.Interrupt
			return
		}
	}
}

func cleanUp(c chan os.Signal) chan int {
	r := make(chan int)
	go func() {
		signal := <-c
		fmt.Printf("Got signal %v, cleaning up...\n", signal)
		r <- 1
	}()
	return r
}

func interactWithUser(s *SavedGroups, yamlFile string, c chan os.Signal) {
	addSavedGroup(s)
	storeSavedGroups(s, yamlFile)
	ClickRepeatedly(s, c)
}

func RunAutoClicker() {
	c := make(chan os.Signal, 1)
	quit := cleanUp(c)
	signal.Notify(c, os.Interrupt)
	yamlFile := "SavedGroups.yaml"
	s := getSavedGroups(yamlFile)
	go interactWithUser(s, yamlFile, c)
	if <-quit == 1 {
		fmt.Println("Exiting...")
	} else {
		fmt.Println("Unknown error...")
	}
}