// Copyright (c) Acrosync LLC. All rights reserved.
// Free for personal use and commercial trial
// Commercial use requires per-user licenses available from https://duplicacy.com

package duplicacy

import (
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"testing"

	crypto_rand "crypto/rand"
	"io"
	"io/ioutil"
	"math/rand"
)

func createB2ClientForTest(t *testing.T) (*B2Client, string) {
	config, err := ioutil.ReadFile("test_storage.conf")
	if err != nil {
		t.Errorf("Failed to read config file: %v", err)
		return nil, ""
	}

	storages := make(map[string]map[string]string)

	err = json.Unmarshal(config, &storages)
	if err != nil {
		t.Errorf("Failed to parse config file: %v", err)
		return nil, ""
	}

	b2, found := storages["b2"]
	if !found {
		t.Errorf("Failed to find b2 config")
		return nil, ""
	}

	return NewB2Client(b2["account"], b2["key"], "", b2["directory"], 1), b2["bucket"]

}

func TestB2Client(t *testing.T) {

	b2Client, bucket := createB2ClientForTest(t)
	if b2Client == nil {
		return
	}

	b2Client.TestMode = true

	err, _ := b2Client.AuthorizeAccount(0)
	if err != nil {
		t.Errorf("Failed to authorize the b2 account: %v", err)
		return
	}

	err = b2Client.FindBucket(bucket)
	if err != nil {
		t.Errorf("Failed to find bucket '%s': %v", bucket, err)
		return
	}

	testDirectory := "b2client_test/"

	files, err := b2Client.ListFileNames(0, testDirectory, false, false)
	if err != nil {
		t.Errorf("Failed to list files: %v", err)
		return
	}

	for _, file := range files {
		err = b2Client.DeleteFile(0, file.FileName, file.FileID)
		if err != nil {
			t.Errorf("Failed to delete file '%s': %v", file.FileName, err)
		}
	}

	maxSize := 10000
	for i := 0; i < 20; i++ {
		size := rand.Int()%maxSize + 1
		content := make([]byte, size)
		_, err := crypto_rand.Read(content)
		if err != nil {
			t.Errorf("Error generating random content: %v", err)
			return
		}

		hash := sha256.Sum256(content)
		name := hex.EncodeToString(hash[:])

		err = b2Client.UploadFile(0, testDirectory+name, content, 100)
		if err != nil {
			t.Errorf("Error uploading file '%s': %v", name, err)
			return
		}
	}

	files, err = b2Client.ListFileNames(0, testDirectory, false, false)
	if err != nil {
		t.Errorf("Failed to list files: %v", err)
		return
	}

	for _, file := range files {

		readCloser, _, err := b2Client.DownloadFile(0, file.FileName)
		if err != nil {
			t.Errorf("Error downloading file '%s': %v", file.FileName, err)
			return
		}

		defer readCloser.Close()

		hasher := sha256.New()
		_, err = io.Copy(hasher, readCloser)

		hash := hex.EncodeToString(hasher.Sum(nil))

		if testDirectory+hash != file.FileName {
			t.Errorf("File %s has hash %s", file.FileName, hash)
		}

	}

	for _, file := range files {
		err = b2Client.DeleteFile(0, file.FileName, file.FileID)
		if err != nil {
			t.Errorf("Failed to delete file '%s': %v", file.FileName, err)
		}
	}
}