package envvars

import (
	"os"
	"strconv"
	"strings"
)

func StringSlice(key, sep string) []string {
	if v, ok := os.LookupEnv(key); ok && strings.TrimSpace(v) != "" {
		return strings.Split(v, sep)
	}
	return []string{}
}

func ByteSlice(key, sep string) []byte {
	return []byte(String(key, ""))
}

func RuneSlice(key, sep string) []rune {
	return []rune(String(key, ""))
}

func IntSlice(key, sep string) []int {
	res := make([]int, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseInt(s, 10, 64); err == nil {
			res = append(res, int(v))
		}
	}
	return res
}

func Int8Slice(key, sep string) []int8 {
	res := make([]int8, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseInt(s, 10, 64); err == nil {
			res = append(res, int8(v))
		}
	}
	return res
}

func Int16Slice(key, sep string) []int16 {
	res := make([]int16, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseInt(s, 10, 64); err == nil {
			res = append(res, int16(v))
		}
	}
	return res
}

func Int32Slice(key, sep string) []int32 {
	res := make([]int32, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseInt(s, 10, 64); err == nil {
			res = append(res, int32(v))
		}
	}
	return res
}

func Int64Slice(key, sep string) []int64 {
	res := make([]int64, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseInt(s, 10, 64); err == nil {
			res = append(res, v)
		}
	}
	return res
}

func Uint8Slice(key, sep string) []uint8 {
	res := make([]uint8, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseUint(s, 10, 64); err == nil {
			res = append(res, uint8(v))
		}
	}
	return res
}

func Uint16Slice(key, sep string) []uint16 {
	res := make([]uint16, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseUint(s, 10, 64); err == nil {
			res = append(res, uint16(v))
		}
	}
	return res
}

func Uint32Slice(key, sep string) []uint32 {
	res := make([]uint32, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseUint(s, 10, 64); err == nil {
			res = append(res, uint32(v))
		}
	}
	return res
}

func Uint64Slice(key, sep string) []uint64 {
	res := make([]uint64, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseUint(s, 10, 64); err == nil {
			res = append(res, v)
		}
	}
	return res
}

func Float32Slice(key, sep string) []float32 {
	res := make([]float32, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseFloat(s, 64); err == nil {
			res = append(res, float32(v))
		}
	}
	return res
}

func Float64Slice(key, sep string) []float64 {
	res := make([]float64, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseFloat(s, 64); err == nil {
			res = append(res, v)
		}
	}
	return res
}

func Complex64Slice(key, sep string) []complex64 {
	res := make([]complex64, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseComplex(s, 64); err == nil {
			res = append(res, complex64(v))
		}
	}
	return res
}

func Complex128Slice(key, sep string) []complex128 {
	res := make([]complex128, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseComplex(s, 64); err == nil {
			res = append(res, v)
		}
	}
	return res
}

func BoolSlice(key, sep string) []bool {
	res := make([]bool, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := strconv.ParseBool(s); err == nil {
			res = append(res, v)
		}
	}
	return res
}

func ObjectSlice[T any](key, sep string, converter func(string) (T, error)) []T {
	res := make([]T, 0)
	for _, s := range StringSlice(key, sep) {
		if v, err := converter(s); err == nil {
			res = append(res, v)
		}
	}
	return res
}