package buildapk

import (
	"fmt"
	"os"
	"path/filepath"
)

const (
	DefaultSDKRoot   = "/opt/android-sdk"
	DefaultNDKRoot   = "/opt/android-ndk"
	DefaultJavaHome  = "/usr/lib/jvm/java-25-openjdk"
	DefaultAppID     = "org.julianfamily.keepassgo"
	DefaultAPKOut    = "build/keepassgo.apk"
	DefaultVersion   = "0.1.0.1"
	DefaultLdflags   = "-X git.julianfamily.org/keepassgo/internal/appui.appVersion=dev"
	DefaultMinSDK    = "28"
	DefaultTargetSDK = "35"
	DefaultIconPath  = "internal/assets/keepassgo-icon.png"
)

type Config struct {
	SDKRoot   string
	NDKRoot   string
	JavaHome  string
	AppID     string
	APKOut    string
	Version   string
	Ldflags   string
	MinSDK    string
	TargetSDK string
	IconPath  string
}

func DefaultConfig() Config {
	return Config{
		SDKRoot:   DefaultSDKRoot,
		NDKRoot:   DefaultNDKRoot,
		JavaHome:  DefaultJavaHome,
		AppID:     DefaultAppID,
		APKOut:    DefaultAPKOut,
		Version:   DefaultVersion,
		Ldflags:   DefaultLdflags,
		MinSDK:    DefaultMinSDK,
		TargetSDK: DefaultTargetSDK,
		IconPath:  DefaultIconPath,
	}
}

func (c Config) GogioArgs() []string {
	return []string{
		"-target", "android",
		"-buildmode", "exe",
		"-appid", c.AppID,
		"-ldflags", c.Ldflags,
		"-o", c.APKOut,
		"-version", c.Version,
		"-minsdk", c.MinSDK,
		"-targetsdk", c.TargetSDK,
		"-icon", c.IconPath,
		"./cmd/keepassgo",
	}
}

func (c Config) Validate() error {
	if !isExecutable(filepath.Join(c.JavaHome, "bin", "java")) {
		return fmt.Errorf("JAVA_HOME must point to a JDK 17+ install")
	}
	if !isDir(c.SDKRoot) {
		return fmt.Errorf("ANDROID_SDK_ROOT must point to an Android SDK install")
	}
	if !isDir(c.NDKRoot) {
		return fmt.Errorf("ANDROID_NDK_ROOT must point to an Android NDK install")
	}
	if !isExecutable(filepath.Join(c.SDKRoot, "cmdline-tools", "latest", "bin", "sdkmanager")) {
		return fmt.Errorf("android SDK cmdline-tools are missing")
	}
	if !isDir(filepath.Join(c.SDKRoot, "platforms", "android-"+c.TargetSDK)) {
		return fmt.Errorf("android platform android-%s is missing", c.TargetSDK)
	}
	if !isDir(filepath.Join(c.SDKRoot, "build-tools")) {
		return fmt.Errorf("android build-tools are missing")
	}
	if !isFile(c.IconPath) {
		return fmt.Errorf("android icon asset is missing: %s", c.IconPath)
	}
	return nil
}

func isDir(path string) bool {
	info, err := os.Stat(path)
	return err == nil && info.IsDir()
}

func isExecutable(path string) bool {
	info, err := os.Stat(path)
	if err != nil || info.IsDir() {
		return false
	}
	return info.Mode()&0o111 != 0
}

func isFile(path string) bool {
	info, err := os.Stat(path)
	return err == nil && !info.IsDir()
}