package geom

import (
	"bytes"
	"strconv"
	"strings"
)

// AbsInt returns the absolute value of i.
func AbsInt(i int) int {
	if 0 > i {
		return -i
	}
	return i
}

// Itoa returns i as a string.
func Itoa(i int) string {
	return strconv.Itoa(i)
}

// Itoa64 returns i as string.
func Itoa64(i int64) string {
	return strconv.FormatInt(i, 10)
}

// FmtInts formats the integer slice as a string each item separated by sep.
func FmtInts(ints []int, sep string) string {
	var out bytes.Buffer
	for i, val := range ints {
		if i > 0 {
			out.WriteString(sep)
		}
		out.WriteString(Itoa(val))
	}
	return out.String()
}

// FmtInts64 formats the integer slice as a string each item separated by sep.
func FmtInts64(ints []int64, sep string) string {
	var out bytes.Buffer
	for i, val := range ints {
		if i > 0 {
			out.WriteString(sep)
		}
		out.WriteString(Itoa64(val))
	}
	return out.String()
}

// MinInt returns the minimum of a and b.
func MinInt(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// MinInt64 returns the minimum of a and b.
func MinInt64(a, b int64) int64 {
	if a < b {
		return a
	}
	return b
}

// MaxInt returns the maximum of a and b.
func MaxInt(a, b int) int {
	if a > b {
		return a
	}
	return b
}

// MaxInt64 returns the maximum of a and b.
func MaxInt64(a, b int64) int64 {
	if a > b {
		return a
	}
	return b
}

// MustAtoi parses string s as an integer. Method panics if the conversion fails.
func MustAtoi(s string) int {
	var i, err = strconv.Atoi(s)
	if nil != err {
		panic("error converting string to int")
	}
	return i
}

// MustAtoi64 parses string s as an integer. Method panics if the conversion fails.
func MustAtoi64(s string) int64 {
	var i, err = strconv.ParseInt(s, 10, 64)
	if nil != err {
		panic("error converting string to int")
	}
	return i
}

// MustAstois parses the strings as integers. Method panics if one of the conversion fails.
func MustAstois(s ...string) []int {
	var res = make([]int, len(s))
	for i := range s {
		res[i] = MustAtoi(s[i])
	}
	return res
}

// MustAstois64 parses the strings as integers. Method panics if one of the conversion fails.
func MustAstois64(s ...string) []int64 {
	var res = make([]int64, len(s))
	for i := range s {
		res[i] = MustAtoi64(s[i])
	}
	return res
}

// NormInt returns the normalized value of i (-1, 0 or 1).
func NormInt(i int) int {
	if i < 0 {
		return -1
	}
	if i > 0 {
		return 1
	}
	return 0
}

// NormInt64 returns the normalized value of i (-1, 0 or 1).
func NormInt64(i int64) int64 {
	if i < 0 {
		return -1
	}
	if i > 0 {
		return 1
	}
	return 0
}

// SplitInts splits the string s by separator sep, converts every part to an integer and returns all the integers as a slice. Method panics if one of the conversion fails.
func SplitInts(s, sep string) []int {
	var numbers = strings.Split(s, sep)
	var ints = make([]int, len(numbers))
	for i, n := range numbers {
		ints[i] = MustAtoi(n)
	}
	return ints
}

// SplitInts64 splits the string s by separator sep, converts every part to an integer and returns all the integers as a slice. Method panics if one of the conversion fails.
func SplitInts64(s, sep string) []int64 {
	var numbers = strings.Split(s, sep)
	var ints = make([]int64, len(numbers))
	for i, n := range numbers {
		ints[i] = MustAtoi64(n)
	}
	return ints
}

// SubAbsInt subtracts a from b and returns the absolute value of the result.
func SubAbsInt(a, b int) int {
	if a > b {
		return a - b
	}
	return b - a
}