/* global it:false */
/* global describe:false */
/* global before:false */
/* global after:false */
/* global xit:false */

'use strict';

const backupSites = require('../backupsites.js'),
    BoxError = require('../boxerror.js'),
    common = require('./common.js'),
    consumers = require('node:stream/consumers'),
    execSync = require('node:child_process').execSync,
    expect = require('expect.js'),
    filesystem = require('../storage/filesystem.js'),
    fs = require('node:fs'),
    gcs = require('../storage/gcs.js'),
    os = require('node:os'),
    path = require('node:path'),
    s3 = require('../storage/s3.js'),
    safe = require('safetydance'),
    stream = require('stream/promises');

describe('Storage', function () {
    const { setup, cleanup, getDefaultBackupSite, auditSource } = common;

    before(setup);
    after(cleanup);

    describe('filesystem', function () {
        let gTmpFolder;

        const gBackupConfig = {
            key: 'key',
            backupDir: null,
            prefix: 'someprefix',
            _provider: 'filesystem' // need this internal variable since we call the backend logic directly for testing
        };

        let defaultBackupSite;

        before(async function () {
            gTmpFolder = fs.mkdtempSync(path.join(os.tmpdir(), 'filesystem-storage-test_'));
            defaultBackupSite = await getDefaultBackupSite();
            gBackupConfig.backupDir = path.join(gTmpFolder, 'backups/');
        });

        after(function (done) {
            fs.rmSync(gTmpFolder, { recursive: true, force: true });
            done();
        });

        it('fails to set backup storage for bad folder', async function () {
            const tmp = Object.assign({}, gBackupConfig, { backupDir: '/root/oof' });
            const [error] = await safe(backupSites.setConfig(defaultBackupSite, tmp, auditSource));
            expect(error.reason).to.equal(BoxError.BAD_FIELD);
        });

        it('succeeds to set backup storage', async function () {
            await backupSites.setConfig(defaultBackupSite, gBackupConfig, auditSource);
            expect(fs.existsSync(path.join(gBackupConfig.backupDir, 'someprefix/snapshot'))).to.be(true); // auto-created
        });

        it('can upload', async function () {
            const sourceFile = path.join(__dirname, 'storage/data/test.txt');
            const sourceStream = fs.createReadStream(sourceFile);
            const destFile = path.join(gBackupConfig.backupDir, gBackupConfig.prefix, '/uploadtest/test.txt');
            const uploader = await filesystem.upload(gBackupConfig, {}, 'uploadtest/test.txt');
            await stream.pipeline(sourceStream, uploader.createStream());
            await uploader.finish();
            expect(fs.existsSync(destFile));
            expect(fs.statSync(sourceFile).size).to.be(fs.statSync(destFile).size);
        });

        xit('upload waits for empty file to be created', async function () {
            const sourceFile = path.join(__dirname, 'storage/data/empty');
            const sourceStream = fs.createReadStream(sourceFile);
            const destFile = path.join(gBackupConfig.backupDir, gBackupConfig.prefix, '/uploadtest/empty');
            const uploader = await filesystem.upload(gBackupConfig, {}, destFile);
            await stream.pipeline(sourceStream, uploader.createStream());
            await uploader.finish();
            expect(fs.existsSync(destFile));
            expect(fs.statSync(sourceFile).size).to.be(fs.statSync(destFile).size);
        });

        it('upload unlinks old file', async function () {
            const sourceFile = path.join(__dirname, 'storage/data/test.txt');
            const sourceStream = fs.createReadStream(sourceFile);
            const destFile = path.join(gBackupConfig.backupDir, gBackupConfig.prefix, '/uploadtest/test.txt');
            const oldStat = fs.statSync(destFile);
            const uploader = await filesystem.upload(gBackupConfig, {}, 'uploadtest/test.txt');
            await stream.pipeline(sourceStream, uploader.createStream());
            await uploader.finish();
            expect(fs.existsSync(destFile)).to.be(true);
            expect(fs.statSync(sourceFile).size).to.be(fs.statSync(destFile).size);
            expect(oldStat.inode).to.not.be(fs.statSync(destFile).size);
        });

        it('can download file', async function () {
            const sourceFile = path.join(gBackupConfig.backupDir, gBackupConfig.prefix, '/uploadtest/test.txt');
            const [error, stream] = await safe(filesystem.download(gBackupConfig, 'uploadtest/test.txt'));
            expect(error).to.be(null);
            expect(stream).to.be.an('object');
            const data = await consumers.buffer(stream);
            expect(fs.readFileSync(sourceFile)).to.eql(data); // buffer compare
        });

        it('download errors for missing file', async function () {
            const [error] = await safe(filesystem.download(gBackupConfig, 'uploadtest/missing'));
            expect(error.reason).to.be(BoxError.NOT_FOUND);
        });

        it('list dir lists the source dir', async function () {
            const sourceDir = path.join(__dirname, 'storage');
            execSync(`cp -r ${sourceDir} ${gBackupConfig.backupDir}/${gBackupConfig.prefix}`, { encoding: 'utf8' });

            let allFiles = [], marker = null;
            while (true) {
                const result = await filesystem.listDir(gBackupConfig, 'storage', 1, marker);
                allFiles = allFiles.concat(result.entries);
                if (!result.marker) break;
                marker = result.marker;
            }

            const expectedFiles = execSync(`find . -type f -printf '%P\n'`, { cwd: sourceDir, encoding: 'utf8' }).trim().split('\n').map(p => `storage/${p}`);
            expect(allFiles.map(function (f) { return f.path; }).sort()).to.eql(expectedFiles.sort());
        });

        it('can copy', async function () {
            // const sourceFile = path.join(gBackupConfig.backupDir, gBackupConfig.prefix, '/uploadtest/test.txt'); // keep the test within same device
            const destFile = path.join(gBackupConfig.backupDir, gBackupConfig.prefix, '/uploadtest/test-hardlink.txt');

            await filesystem.copy(gBackupConfig, 'uploadtest/test.txt', 'uploadtest/test-hardlink.txt', () => {});
            expect(fs.statSync(destFile).nlink).to.be(2); // created a hardlink
        });

        it('can remove file', async function () {
            const sourceFile = path.join(gBackupConfig.backupDir, gBackupConfig.prefix, '/uploadtest/test-hardlink.txt');

            await filesystem.remove(gBackupConfig, 'uploadtest/test-hardlink.txt');
            expect(fs.existsSync(sourceFile)).to.be(false);
        });

        it('can remove empty dir', async function () {
            const sourceDir = path.join(gBackupConfig.backupDir, gBackupConfig.prefix, 'emptydir');
            fs.mkdirSync(sourceDir);

            await filesystem.remove(gBackupConfig, 'emptydir', () => {});
            expect(fs.existsSync(sourceDir)).to.be(false);
        });
    });

    describe('s3', function () {
        const basePath = path.join(os.tmpdir(), 's3-backup-test-buckets');
        const backupConfig = {
            provider: 's3',
            key: 'key',
            prefix: 'prefix-test',
            bucket: 'cloudron-storage-test',
            accessKeyId: 'testkeyid',
            secretAccessKey: 'testsecret',
            region: 'eu-central-1',
            format: 'tgz'
        };
        const bucketPath = path.join(basePath, backupConfig.bucket, backupConfig.prefix);
        const bucketPathNoPrefix = path.join(basePath, backupConfig.bucket);

        class S3MockUpload {
            constructor(args) { // { client: s3, params, partSize, queueSize: 3, leavePartsOnError: false }
                // console.log('S3MockUpload constructor:', basePath, args.params.Bucket, args.params.Key);
                const destFilePath = path.join(basePath, args.params.Bucket, args.params.Key);
                fs.mkdirSync(path.dirname(destFilePath), { recursive: true });
                this.pipeline = stream.pipeline(args.params.Body, fs.createWriteStream(destFilePath));
            }

            on() {}

            async done() {
                await this.pipeline;
            }
        }

        class S3Mock {
            constructor(cfg) {
                expect(cfg.credentials).to.eql({ // retryDelayOptions is a function
                    accessKeyId: backupConfig.accessKeyId,
                    secretAccessKey: backupConfig.secretAccessKey
                });
                expect(cfg.region).to.be(backupConfig.region);
            }

            async headObject(params) {
                expect(params.Bucket).to.be(backupConfig.bucket);
                const stat = await fs.promises.stat(path.join(bucketPathNoPrefix, params.Key));
                return { ContentLength: stat.size };
            }

            async listObjectsV2(params) {
                expect(params.Bucket).to.be(backupConfig.bucket);
                return {
                    Contents: [{
                        Key: `${backupConfig.prefix}/uploadtest/test.txt`,
                        Size: 23
                    }, {
                        Key: `${backupConfig.prefix}/uploadtest/C++.gitignore`,
                        Size: 23
                    }]
                };
            }

            async copyObject(params) {
                // CopySource already has the bucket path!
                const source = path.join(basePath, params.CopySource.replace(/%2B/g, '+'));
                // Key already has prefix but no bucket ptah!
                const dest = path.join(bucketPathNoPrefix, params.Key);
                // console.log('Copying:', source, dest, path.dirname(dest));
                await fs.promises.mkdir(path.dirname(dest), { recursive: true });
                await fs.promises.copyFile(source, dest);
            }

            async deleteObject(params) {
                expect(params.Bucket).to.be(backupConfig.bucket);
                fs.rmSync(path.join(bucketPathNoPrefix, params.Key));
            }

            async deleteObjects(params) {
                expect(params.Bucket).to.be(backupConfig.bucket);
                params.Delete.Objects.forEach(o => fs.rmSync(path.join(bucketPathNoPrefix, o.Key)));
            }
        }

        before(function () {
            fs.rmSync(basePath, { recursive: true, force: true });
            globalThis.S3Mock = S3Mock;
            globalThis.S3MockUpload = S3MockUpload;
        });

        after(function () {
           // fs.rmSync(basePath, { recursive: true, force: true });
            delete globalThis.S3Mock;
            delete globalThis.S3MockUpload;
        });

        it('can upload', async function () {
            const sourceFile = path.join(__dirname, 'storage/data/test.txt');
            const sourceStream = fs.createReadStream(sourceFile);
            const destKey = 'uploadtest/test.txt';
            const uploader = await s3.upload(backupConfig, {}, destKey);
            await stream.pipeline(sourceStream, uploader.createStream());
            await uploader.finish();
            expect(fs.existsSync(path.join(bucketPath, destKey))).to.be(true);
            expect(fs.statSync(path.join(bucketPath, destKey)).size).to.be(fs.statSync(sourceFile).size);
        });

        it('can download file', async function () {
            const sourceKey = 'uploadtest/test.txt';
            const [error, outstream] = await safe(s3.download(backupConfig, sourceKey));
            expect(error).to.be(null);
            expect(outstream).to.be.an('object');
        });

        it('list dir lists contents of source dir', async function () {
            let allFiles = [], marker = null;

            while (true) {
                const result = await s3.listDir(backupConfig, '', 1, marker);
                allFiles = allFiles.concat(result.entries);
                if (!result.marker) break;
                marker = result.marker;
            }

            expect(allFiles.map(function (f) { return f.path; })).to.contain('uploadtest/test.txt');
        });

        it('can copy', async function () {
            fs.writeFileSync(path.join(bucketPath, 'uploadtest/C++.gitignore'), 'special', 'utf8');

            await s3.copyDir(backupConfig, {}, 'uploadtest', 'uploadtest-copy', () => {});
            const sourceFile = path.join(__dirname, 'storage/data/test.txt');
            expect(fs.statSync(path.join(bucketPath, 'uploadtest-copy/test.txt')).size).to.be(fs.statSync(sourceFile).size);
            expect(fs.statSync(path.join(bucketPath, 'uploadtest-copy/C++.gitignore')).size).to.be(7);
        });

        it('can remove file', async function () {
            await s3.remove(backupConfig, 'uploadtest/test.txt');
            expect(fs.existsSync(path.join(bucketPath, 'uploadtest/test.txt'))).to.be(false);
        });

        it('cannot remove non-existent file', async function () {
            const [error] = await safe(s3.remove(backupConfig, 'blah'));
            expect(error).to.be.ok();
        });
    });

    describe('gcs', function () {
        const backupConfig = {
            provider: 'gcs',
            key: '',
            prefix: 'unit.test',
            bucket: 'cloudron-storage-test',
            projectId: 'some-project',
            credentials: {
                client_email: 'some-client',
                private_key: 'some-key'
            }
        };

        const basePath = path.join(os.tmpdir(), 'gcs-backup-test-buckets/');
        const bucketPath = path.join(basePath, backupConfig.bucket, backupConfig.prefix);
        const bucketPathNoPrefix = path.join(basePath, backupConfig.bucket);

        class GCSMockBucket {
            constructor(name) {
                expect(name).to.be(backupConfig.bucket);
            }
            file(key) { // already has prefix
                // console.log('gcs file object:', key);
                function getFullWritablePath(key) {
                    const fullPath = path.join(bucketPathNoPrefix, key);
                    fs.mkdirSync(path.dirname(fullPath), { recursive: true });
                    return fullPath;
                }

                return {
                    name: key,
                    createReadStream: function() {
                        return fs.createReadStream(getFullWritablePath(key))
                            .on('error', function(e){
                                // console.log('error createReadStream: ' + key);
                                if (e.code == 'ENOENT') { e.code = 404; }
                                this.emit('error', e);
                            });
                    },
                    createWriteStream: function() {
                        return fs.createWriteStream(getFullWritablePath(key));
                    },
                    delete: async function() {
                        await fs.promises.unlink(getFullWritablePath(key));
                    },
                    copy: async function(destKey) {
                        // console.log('gcs copy:', key, destKey);
                        await fs.promises.mkdir(path.dirname(path.join(bucketPathNoPrefix, destKey)), { recursive: true });
                        await fs.promises.copyFile(path.join(bucketPathNoPrefix, key), path.join(bucketPathNoPrefix, destKey));
                    }
                };
            }
            async getFiles(q) {
                expect(q.maxResults).to.be.a('number');
                expect(q.prefix).to.be.a('string');

                const files = [{
                    name: `${backupConfig.prefix}/uploadtest/test.txt`,
                }, {
                    name: `${backupConfig.prefix}/uploadtest/C++.gitignore`,
                }];

                return [ files, null ];
            }
        };

        class GCSMock {
            constructor(config) {
                expect(config.projectId).to.be(backupConfig.projectId);
                expect(config.credentials.private_key).to.be(backupConfig.credentials.private_key);
            }

            bucket(name) {
                return new GCSMockBucket(name);
            }
        }

        before(function () {
            globalThis.GCSMock = GCSMock;
        });

        after(function () {
            fs.rmSync(basePath, { recursive: true, force: true });
            delete globalThis.GCSMock;
        });

        it('can upload', async function () {
            const sourceFile = path.join(__dirname, 'storage/data/test.txt');
            const sourceStream = fs.createReadStream(sourceFile);
            const destKey = 'uploadtest/test.txt';
            const uploader = await gcs.upload(backupConfig, {}, destKey);
            await stream.pipeline(sourceStream, uploader.createStream());
            await uploader.finish();
            expect(fs.existsSync(path.join(bucketPath, destKey))).to.be(true);
            expect(fs.statSync(path.join(bucketPath, destKey)).size).to.be(fs.statSync(sourceFile).size);
        });

        it('can download file', async function () {
            const sourceKey = 'uploadtest/test.txt';
            const [error, stream] = await safe(gcs.download(backupConfig, sourceKey));
            expect(error).to.be(null);
            expect(stream).to.be.an('object');
        });

        it('list dir lists contents of source dir', async function () {
            let allFiles = [ ], marker = null;

            while (true) {
                const result = await gcs.listDir(backupConfig, '', 1, marker);
                allFiles = allFiles.concat(result.entries);
                if (!result.marker) break;
                marker = result.marker;
            }

            expect(allFiles.map(function (f) { return f.path; })).to.contain('uploadtest/test.txt');
        });

        it('can copy', async function () {
            fs.writeFileSync(path.join(bucketPath, 'uploadtest/C++.gitignore'), 'special', 'utf8');

            await gcs.copyDir(backupConfig, {}, 'uploadtest', 'uploadtest-copy', () => {});
            const sourceFile = path.join(__dirname, 'storage/data/test.txt');
            expect(fs.statSync(path.join(bucketPath, 'uploadtest-copy/test.txt')).size).to.be(fs.statSync(sourceFile).size);
            expect(fs.statSync(path.join(bucketPath, 'uploadtest-copy/C++.gitignore')).size).to.be(7);
        });

        it('can remove file', async function () {
            await gcs.remove(backupConfig, 'uploadtest-copy/test.txt');
            expect(fs.existsSync(path.join(basePath, 'uploadtest-copy/test.txt'))).to.be(false);
        });

        it('can remove non-existent dir', async function () {
            await gcs.remove(backupConfig, 'blah', () => {});
        });
    });
});