//+build !darwin !linux

package main

/*
#cgo LDFLAGS: -landroid -llog

#include <stdlib.h>
#include "jni_android.h"
*/
import "C"

import (
	"errors"
	"fmt"
	"runtime"
	"unsafe"

	"gioui.org/app"
	"gioui.org/io/event"
	_ "gioui.org/app/permission/storage"
)

type JNIEnv = C.JNIEnv
var (
	startpath="/storage/emulated/0/Notes"
	jvm uintptr
	theJVM *C.JavaVM
)

func impl_start() { }

func handleEvent(e event.Event) {
	switch e := e.(type) {
	case app.AndroidViewEvent:
		theJVM = (*C.JavaVM)(unsafe.Pointer(app.JavaVM()))
		RunInJVM(func(env *JNIEnv) {
			C.registerFragment(env, (C.jobject)(unsafe.Pointer(e.View)))
		})
	}
}

func RunInJVM(f func(env *C.JNIEnv)) {
        runtime.LockOSThread()
        defer runtime.UnlockOSThread()
        var env *C.JNIEnv
        var detach bool
        if res := C.GetEnv(theJVM, &env, C.JNI_VERSION_1_6); res != C.JNI_OK {
                if res != C.JNI_EDETACHED {
                        panic(fmt.Errorf("JNI GetEnv failed with error %d", res))
                }
                if C.AttachCurrentThread(theJVM, &env, nil) != C.JNI_OK {
                        panic(errors.New("runInJVM: AttachCurrentThread failed"))
                }
                detach = true
        }

        if detach {
                defer func() {
                        C.DetachCurrentThread(theJVM)
                }()
        }
        f(env)
}

func OpenFile(path string) {
	var env *C.JNIEnv
	var detach bool
 	if res := C.GetEnv(theJVM, &env, C.JNI_VERSION_1_6); res != C.JNI_OK {
		if res != C.JNI_EDETACHED {
			panic(fmt.Errorf("JNI GetEnv failed with error %d", res))
		}
		if C.AttachCurrentThread(theJVM, &env, nil) != C.JNI_OK {
			panic(errors.New("OpenFile: AttachCurrentThread failed"))
		}
	detach = true
	}

	if detach {
		defer func() {
			C.DetachCurrentThread(theJVM)
		}()
	}
	cpath := C.CString(path)
	C.open_file_in_termux(env, cpath)
	C.free(unsafe.Pointer(cpath))
}