package env

import (
	"os"
	"strconv"
)

// Get an environment variable as an int, specifying a default value if its
// not set or can't be parsed properly into an int
func Int(key string, defaultValue int) int {
	val, exists := os.LookupEnv(key)
	if !exists {
		return defaultValue
	}

	intVal, err := strconv.Atoi(val)
	if err != nil {
		return defaultValue
	}
	return intVal
}

// Get an environment variable as an int8, specifying a default value if its
// not set or can't be parsed properly into an int8
func Int8(key string, defaultValue int8) int8 {
	val, exists := os.LookupEnv(key)
	if !exists {
		return defaultValue
	}

	intVal, err := strconv.ParseInt(val, 10, 8)
	if err != nil {
		return defaultValue
	}
	return int8(intVal)
}

// Get an environment variable as an int16, specifying a default value if its
// not set or can't be parsed properly into an int16
func Int16(key string, defaultValue int16) int16 {
	val, exists := os.LookupEnv(key)
	if !exists {
		return defaultValue
	}

	intVal, err := strconv.ParseInt(val, 10, 16)
	if err != nil {
		return defaultValue
	}
	return int16(intVal)
}

// Get an environment variable as an int32, specifying a default value if its
// not set or can't be parsed properly into an int32
func Int32(key string, defaultValue int32) int32 {
	val, exists := os.LookupEnv(key)
	if !exists {
		return defaultValue
	}

	intVal, err := strconv.ParseInt(val, 10, 32)
	if err != nil {
		return defaultValue
	}
	return int32(intVal)
}

// Get an environment variable as an int64, specifying a default value if its
// not set or can't be parsed properly into an int64
func Int64(key string, defaultValue int64) int64 {
	val, exists := os.LookupEnv(key)
	if !exists {
		return defaultValue
	}

	intVal, err := strconv.ParseInt(val, 10, 64)
	if err != nil {
		return defaultValue
	}
	return intVal

}