// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package java

import (
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
)

// TestJavaSeqTest runs java test SeqTest.java.
// This requires the gradle command in PATH and
// the Android SDK whose path is available through ANDROID_HOME environment variable.
func TestJavaSeqTest(t *testing.T) {
	if _, err := run("which gradle"); err != nil {
		t.Skip("command gradle not found, skipping")
	}
	if sdk := os.Getenv("ANDROID_HOME"); sdk == "" {
		t.Skip("ANDROID_HOME environment var not set, skipping")
	}
	if _, err := run("which gomobile"); err != nil {
		_, err := run("go install golang.org/x/mobile/cmd/gomobile")
		if err != nil {
			t.Skip("gomobile not available, skipping")
		}
	}

	// TODO(hyangah): gomobile init if necessary.

	cwd, err := os.Getwd()
	if err != nil {
		t.Fatalf("failed pwd: %v", err)
	}
	tmpdir, err := ioutil.TempDir("", "bind-java-seq-test-")
	if err != nil {
		t.Fatalf("failed to prepare temp dir: %v", err)
	}
	defer os.RemoveAll(tmpdir)
	t.Logf("tmpdir = %s", tmpdir)

	if err := os.Chdir(tmpdir); err != nil {
		t.Fatalf("failed chdir: %v", err)
	}
	defer os.Chdir(cwd)

	for _, d := range []string{"src/main", "src/androidTest/java/go", "libs"} {
		err = os.MkdirAll(filepath.Join(tmpdir, d), 0700)
		if err != nil {
			t.Fatal(err)
		}
	}

	buf, err := run("gomobile bind golang.org/x/mobile/bind/java/testpkg")
	if err != nil {
		t.Logf("%s", buf)
		t.Fatalf("failed to run gomobile bind: %v", err)
	}

	fname := filepath.Join(tmpdir, "libs", "testpkg.aar")
	err = cp(fname, filepath.Join(tmpdir, "testpkg.aar"))
	if err != nil {
		t.Fatalf("failed to copy testpkg.aar: %v", err)
	}

	fname = filepath.Join(tmpdir, "src/androidTest/java/go/SeqTest.java")
	err = cp(fname, filepath.Join(cwd, "SeqTest.java"))
	if err != nil {
		t.Fatalf("failed to copy SeqTest.java: %v", err)
	}

	fname = filepath.Join(tmpdir, "src/main/AndroidManifest.xml")
	err = ioutil.WriteFile(fname, []byte(androidmanifest), 0700)
	if err != nil {
		t.Fatalf("failed to write android manifest file: %v", err)
	}

	fname = filepath.Join(tmpdir, "build.gradle")
	err = ioutil.WriteFile(fname, []byte(buildgradle), 0700)
	if err != nil {
		t.Fatalf("failed to write build.gradle file: %v", err)
	}

	if buf, err := run("gradle connectedAndroidTest"); err != nil {
		t.Logf("%s", buf)
		t.Errorf("failed to run gradle test: %v", err)
	}
}

func run(cmd string) ([]byte, error) {
	c := strings.Split(cmd, " ")
	return exec.Command(c[0], c[1:]...).CombinedOutput()
}

func cp(dst, src string) error {
	r, err := os.Open(src)
	if err != nil {
		return fmt.Errorf("failed to read source: %v", err)
	}
	defer r.Close()
	w, err := os.Create(dst)
	if err != nil {
		return fmt.Errorf("failed to open destination: %v", err)
	}
	_, err = io.Copy(w, r)
	cerr := w.Close()
	if err != nil {
		return err
	}
	return cerr
}

const androidmanifest = `<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.BindTest"
	  android:versionCode="1"
	  android:versionName="1.0">
</manifest>`

const buildgradle = `buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.1.3'
    }
}

allprojects {
    repositories { jcenter() }
}

apply plugin: 'com.android.library'

android {
    compileSdkVersion 'android-19'
    buildToolsVersion '21.1.2'
    defaultConfig { minSdkVersion 15 }
}

repositories {
    flatDir { dirs 'libs' }
}
dependencies {
    compile 'com.android.support:appcompat-v7:19.0.0'
    compile(name: "testpkg", ext: "aar")
}
`