package dartgen

import (
	"os"
	"reflect"
	"strings"

	"github.com/tal-tech/go-zero/tools/goctl/api/util"
)

func lowCamelCase(s string) string {
	if len(s) < 1 {
		return ""
	}

	s = util.ToCamelCase(util.ToSnakeCase(s))
	return util.ToLower(s[:1]) + s[1:]
}

func pathToFuncName(path string) string {
	if !strings.HasPrefix(path, "/") {
		path = "/" + path
	}
	if !strings.HasPrefix(path, "/api") {
		path = "/api" + path
	}

	path = strings.Replace(path, "/", "_", -1)
	path = strings.Replace(path, "-", "_", -1)

	camel := util.ToCamelCase(path)
	return util.ToLower(camel[:1]) + camel[1:]
}

func tagGet(tag, k string) (reflect.Value, error) {
	v, _ := util.TagLookup(tag, k)
	out := strings.Split(v, ",")[0]
	return reflect.ValueOf(out), nil
}

func isDirectType(s string) bool {
	return isAtomicType(s) || isListType(s) && isAtomicType(getCoreType(s))
}

func isAtomicType(s string) bool {
	switch s {
	case "String", "int", "double", "bool":
		return true
	default:
		return false
	}
}

func isListType(s string) bool {
	return strings.HasPrefix(s, "List<")
}

func isClassListType(s string) bool {
	return strings.HasPrefix(s, "List<") && !isAtomicType(getCoreType(s))
}

func getCoreType(s string) string {
	if isAtomicType(s) {
		return s
	}
	if isListType(s) {
		s = strings.Replace(s, "List<", "", -1)
		return strings.Replace(s, ">", "", -1)
	}
	return s
}

func fileExists(path string) bool {
	_, err := os.Stat(path)
	return !os.IsNotExist(err)
}