package utils

import (
	"io/ioutil"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"syscall"
	"unsafe"
)

type winsize struct {
	Row    uint16
	Col    uint16
	Xpixel uint16
	Ypixel uint16
}

func GetWidth() *winsize {
	ws := &winsize{}
	retCode, _, errno := syscall.Syscall(syscall.SYS_IOCTL,
		uintptr(syscall.Stdin),
		uintptr(syscall.TIOCGWINSZ),
		uintptr(unsafe.Pointer(ws)))

	if int(retCode) == -1 {
		panic(errno)
	}
	return ws
}

func GetFontWidth() (float32, float32) {
	g := GetWidth()
	fw := float32(g.Xpixel) / float32(g.Col)
	fh := float32(g.Ypixel) / float32(g.Row)
	return fw, fh
}

func StrTime(e float64) string {
	a := int(e)
	var min, seconds string
	if a/60 < 10 {
		min = "0"
		min += strconv.Itoa(a / 60)
	} else {
		min = strconv.Itoa(a / 60)
	}
	if a%60 < 10 {
		seconds = "0"
		seconds += strconv.Itoa(a % 60)
	} else {
		seconds = strconv.Itoa(a % 60)
	}
	return min + ":" + seconds
}

func InsertAt(inputString, stringTobeInserted string, index int) string {
	s := inputString[:index] + stringTobeInserted + inputString[index:]
	return s
}

func ConvertToArray(ArtistTree map[string]map[string]map[string]string) []string {
	var p []string
	for k2, v := range ArtistTree {
		p = append(p, k2)
		for k1, v1 := range v {
			p = append(p, k1)
			for k := range v1 {
				p = append(p, k)
			}
		}
	}
	return p
}

func FormatString(a interface{}) string {
	if a == "play" {
		return "Playing"
	} else if a == "1" {
		return "On"
	} else if a == "0" {
		return "Off"
	} else if a == "stop" {
		return "Stopped"
	} else {
		return "Paused"
	}
}

func Copy(sourceImage, destinationImage string) error {
	source, err := ioutil.ReadFile(sourceImage)
	if err != nil {
		return err
	} else {
		err = ioutil.WriteFile(destinationImage, source, 0644)
		if err != nil {
			return err
		}
		return nil
	}
}

func GetFormattedString(s string, width int) string {
	if len(s) < width {
		s += strings.Repeat(" ", width-len(s))
	} else {
		s = s[:(width - 2)]
		s += "  "
	}
	return s
}

func CheckDirectoryFmt(path string) string {
	if strings.HasSuffix(path, "/") {
		return path
	} else {
		return path + "/"
	}
}

func ExpandHomeDir(path string) string {
	HOME_DIR, _ := os.UserHomeDir()
	if strings.HasPrefix(path, "~/") {
		return filepath.Join(HOME_DIR, path[1:])
	} else if path == "~" {
		return HOME_DIR
	} else {
		return path
	}
}

func GetMatchedString(a []int, s, color string) string {
	// The Matches are sorted so we just have to traverse the Matches and if the two adjacent matches are not consecutive
	// then we append the color string at the start + offset and the nulcol ( reset ) at end + offset + 1 and then reset
	// start and end to a[k+1] for e.g if matches := []int{1, 2, 4, 5, 6, 9} then the start will be 1 and end will be 1
	// now until we reach `4` the value of end will change to `2` that means when we reach `4` the s string will be
	// `O[yellow:-:-]ut[-:-:-]putString` after that until we reach the end will be changed and finally become `6` and the
	// s string will be `O[yellow:-:-]ut[-:-:-]p[yellow:-:-]utS[-:-:-]tring`
	// Please note that after around 45 simulatenously highlighted characters tview stops highlighting and the color
	// sequences are rendered hope no one has that big of search query.
	start := a[0]
	end := a[0]
	offset := 0
	nulcol := "[-:-:-]"
	for k := range a {
		if k < len(a)-1 && a[k+1]-a[k] == 1 {
			end = a[k+1]
		} else if k < len(a)-1 {
			s = InsertAt(s, color, start+offset)
			offset += len(color)
			s = InsertAt(s, nulcol, end+offset+1)
			offset += len(nulcol)
			start = a[k+1]
			end = a[k+1]
		} else if k == len(a)-1 {
			s = InsertAt(s, color, start+offset)
			offset += len(color)
			s = InsertAt(s, nulcol, end+offset+1)
			offset += len(nulcol)
		}
	}
	return s
}

func Unique(intSlice []int) []int {
	keys := make(map[int]bool)
	var list []int
	for _, entry := range intSlice {
		if _, exists := keys[entry]; !exists {
			keys[entry] = true
			list = append(list, entry)
		}
	}
	return list
}