package javaentities

import (
	"errors"
	"os"
	"path"
	"runtime"
	"strconv"
	"strings"
)

type JavaVersion struct {
	Major int
	Minor int
	Patch int
}

type JavaMetas struct {
	JavaVersions []JavaMeta `json:"javaVersions"`
}

func (jm JavaMetas) FindOsURL(MajorVersion string) (SpecificJavaVersion, error) {
	for _, v := range jm.JavaVersions {
		if MajorVersion == v.Version.Major {
			jv, err := v.getOsJava()
			if err != nil {
				continue
			}
			return jv, nil
		}
	}
	return SpecificJavaVersion{}, errors.New("cant find os url")
}

type JavaMeta struct {
	Version struct {
		Major string `json:"major"`
		Minor string `json:"minor"`
		Patch string `json:"patch"`
	} `json:"version"`
	Specifics `json:"specifics"`
}

type SpecificJavaVersion struct {
	Os   string `json:"os"`
	Arch string `json:"arch"`
	URL  string `json:"URL"`
	Sha1 string `json:"SHA1"`
}

type Specifics []SpecificJavaVersion

func (s Specifics) getOsJava() (SpecificJavaVersion, error) {
	for _, v := range s {
		if v.Os == runtime.GOOS {
			return v, nil
		}
	}
	return SpecificJavaVersion{}, errors.New("not java for current os")
}

func (v *JavaVersion) CheckNotExists(launcherPath string) bool {
	javaBinPath := path.Join(launcherPath, ".redist", "java", v.GetString())
	_, err := os.Stat(javaBinPath)

	return err != nil
}

func (v *JavaVersion) GetString() string {
	var stringBuilder strings.Builder
	stringBuilder.WriteString(strconv.Itoa(v.Major))
	stringBuilder.WriteRune('.')
	stringBuilder.WriteString(strconv.Itoa(v.Minor))
	stringBuilder.WriteRune('.')
	stringBuilder.WriteString(strconv.Itoa(v.Patch))

	return stringBuilder.String()
}