'use strict';

exports = module.exports = {
    upload: upload,
    download: download,

    copy: copy,

    listDir: listDir,

    remove: remove,
    removeDir: removeDir,

    testConfig: testConfig,
    removePrivateFields: removePrivateFields,
    injectPrivateFields: injectPrivateFields
};

var assert = require('assert'),
    BoxError = require('../boxerror.js'),
    debug = require('debug')('box:storage/sshfs'),
    filesystem = require('./filesystem.js'),
    mkdirp = require('mkdirp'),
    path = require('path'),
    safe = require('safetydance'),
    shell = require('../shell.js');

// we mostly reuse the filesystem.js implementation but the config params are different
function translateConfig(apiConfig) {
    assert.strictEqual(typeof apiConfig, 'object');

    // skip chown
    apiConfig._doNotChown = true;

    // do not preserver file attributes
    apiConfig._doNotPreserveAttributes = true;

    // resolve the actual path
    apiConfig.backupFolder = path.join(apiConfig.mountPoint, apiConfig.prefix);

    return apiConfig;
}

// storage api
function upload(apiConfig, backupFilePath, sourceStream, callback) {
    assert.strictEqual(typeof apiConfig, 'object');
    assert.strictEqual(typeof backupFilePath, 'string');
    assert.strictEqual(typeof sourceStream, 'object');
    assert.strictEqual(typeof callback, 'function');

    filesystem.upload(translateConfig(apiConfig), backupFilePath, sourceStream, callback);
}

function download(apiConfig, sourceFilePath, callback) {
    assert.strictEqual(typeof apiConfig, 'object');
    assert.strictEqual(typeof sourceFilePath, 'string');
    assert.strictEqual(typeof callback, 'function');

    filesystem.download(translateConfig(apiConfig), sourceFilePath, callback);
}

function listDir(apiConfig, dir, batchSize, iteratorCallback, callback) {
    assert.strictEqual(typeof apiConfig, 'object');
    assert.strictEqual(typeof dir, 'string');
    assert.strictEqual(typeof batchSize, 'number');
    assert.strictEqual(typeof iteratorCallback, 'function');
    assert.strictEqual(typeof callback, 'function');

    filesystem.listDir(translateConfig(apiConfig), dir, batchSize, iteratorCallback, callback);
}

function copy(apiConfig, oldFilePath, newFilePath) {
    assert.strictEqual(typeof apiConfig, 'object');
    assert.strictEqual(typeof oldFilePath, 'string');
    assert.strictEqual(typeof newFilePath, 'string');

    return filesystem.copy(translateConfig(apiConfig), oldFilePath, newFilePath);
}

function remove(apiConfig, filename, callback) {
    assert.strictEqual(typeof apiConfig, 'object');
    assert.strictEqual(typeof filename, 'string');
    assert.strictEqual(typeof callback, 'function');

    filename.remove(translateConfig(apiConfig), filename, callback);
}

function removeDir(apiConfig, pathPrefix) {
    assert.strictEqual(typeof apiConfig, 'object');
    assert.strictEqual(typeof pathPrefix, 'string');

    return filesystem.removeDir(translateConfig(apiConfig), pathPrefix);
}

function testConfig(apiConfig, callback) {
    assert.strictEqual(typeof apiConfig, 'object');
    assert.strictEqual(typeof callback, 'function');

    if (!apiConfig.mountPoint || typeof apiConfig.mountPoint !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'mountPoint must be non-empty string', { field: 'mountPoint' }));

    if ('noHardlinks' in apiConfig && typeof apiConfig.noHardlinks !== 'boolean') return callback(new BoxError(BoxError.BAD_FIELD, 'noHardlinks must be boolean', { field: 'noHardLinks' }));
    if (typeof apiConfig.prefix !== 'string') return callback(new BoxError(BoxError.BAD_FIELD, 'prefix must be a string', { field: 'prefix' }));

    // TODO check fstab entry
    // TODO check mountpoint

    const backupPath = path.join(apiConfig.mountPoint, apiConfig.prefix);

    const stat = safe.fs.statSync(backupPath);
    if (!stat) return callback(new BoxError(BoxError.BAD_FIELD, 'Directory does not exist or cannot be accessed: ' + safe.error.message), { field: 'prefix' });
    if (!stat.isDirectory()) return callback(new BoxError(BoxError.BAD_FIELD, 'Backup location is not a directory', { field: 'prefix' }));

    if (!safe.fs.mkdirSync(path.join(backupPath, 'snapshot')) && safe.error.code !== 'EEXIST') {
        if (safe.error && safe.error.code === 'EACCES') return callback(new BoxError(BoxError.BAD_FIELD, `Access denied. Run "chown yellowtent:yellowtent ${backupPath}" on the server`, { field: 'prefix' }));
        return callback(new BoxError(BoxError.BAD_FIELD, safe.error.message, { field: 'prefix' }));
    }

    if (!safe.fs.writeFileSync(path.join(backupPath, 'cloudron-testfile'), 'testcontent')) {
        return callback(new BoxError(BoxError.BAD_FIELD, `Unable to create test file as 'yellowtent' user in ${backupPath}: ${safe.error.message}. Check dir/mount permissions`, { field: 'prefix' }));
    }

    if (!safe.fs.unlinkSync(path.join(backupPath, 'cloudron-testfile'))) {
        return callback(new BoxError(BoxError.BAD_FIELD, `Unable to remove test file as 'yellowtent' user in ${backupPath}: ${safe.error.message}. Check dir/mount permissions`, { field: 'prefix' }));
    }

    callback(null);
}

function removePrivateFields(apiConfig) {
    return apiConfig;
}

function injectPrivateFields(/* newConfig, currentConfig */) {
}