package compare

import "time"

// Compare 如下
//    k1 > k2 -->  1
//    k1 == k2 --> 0
//    k1 < k2 --> -1
type Compare func(k1, k2 interface{}) int

// String comp
func String(k1, k2 interface{}) int {
	s1 := k1.(string)
	s2 := k2.(string)

	switch {
	case len(s1) > len(s2):
		for i := 0; i < len(s2); i++ {
			if s1[i] != s2[i] {
				if s1[i] > s2[i] {
					return 1
				}
				return -1
			}
		}
		return 1
	case len(s1) < len(s2):
		for i := 0; i < len(s1); i++ {
			if s1[i] != s2[i] {
				if s1[i] > s2[i] {
					return 1
				}
				return -1
			}
		}
		return -1
	default:
		for i := 0; i < len(s1); i++ {
			if s1[i] != s2[i] {
				if s1[i] > s2[i] {
					return 1
				}
				return -1
			}
		}
		return 0
	}

}

func Int(k1, k2 interface{}) int {
	c1 := k1.(int)
	c2 := k2.(int)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Int8(k1, k2 interface{}) int {
	c1 := k1.(int8)
	c2 := k2.(int8)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Int16(k1, k2 interface{}) int {
	c1 := k1.(int16)
	c2 := k2.(int16)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Int32(k1, k2 interface{}) int {
	c1 := k1.(int32)
	c2 := k2.(int32)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Int64(k1, k2 interface{}) int {
	c1 := k1.(int64)
	c2 := k2.(int64)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func UInt(k1, k2 interface{}) int {
	c1 := k1.(uint)
	c2 := k2.(uint)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func UInt8(k1, k2 interface{}) int {
	c1 := k1.(uint8)
	c2 := k2.(uint8)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func UInt16(k1, k2 interface{}) int {
	c1 := k1.(uint16)
	c2 := k2.(uint16)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func UInt32(k1, k2 interface{}) int {
	c1 := k1.(uint32)
	c2 := k2.(uint32)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func UInt64(k1, k2 interface{}) int {
	c1 := k1.(uint64)
	c2 := k2.(uint64)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Float32(k1, k2 interface{}) int {
	c1 := k1.(float32)
	c2 := k2.(float32)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Float64(k1, k2 interface{}) int {
	c1 := k1.(float64)
	c2 := k2.(float64)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Byte(k1, k2 interface{}) int {
	c1 := k1.(byte)
	c2 := k2.(byte)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Rune(k1, k2 interface{}) int {
	c1 := k1.(rune)
	c2 := k2.(rune)
	switch {
	case c1 > c2:
		return 1
	case c1 < c2:
		return -1
	default:
		return 0
	}
}

func Time(k1, k2 interface{}) int {
	c1 := k1.(time.Time)
	c2 := k2.(time.Time)

	switch {
	case c1.After(c2):
		return 1
	case c1.Before(c2):
		return -1
	default:
		return 0
	}
}