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let fs = require('fs'),
let fs = require('fs'),
path = require('path'),
path = require('path'),
crypto = require('crypto'),
crypto = require('crypto'),
Stream = require('stream'),
Stream = require('stream'),
gutil = require('gulp-util'),
gutil = require('gulp-util'),
oncechecksums = {};
oncechecksums = {};


module.exports = function(options = {}) {
module.exports = function(options = {}) {


let stream = new Stream.Transform({objectMode: true}),
let stream = new Stream.Transform({objectMode: true}),
settings = {
settings = {
namespace: false,
namespace: false,
algorithm: 'sha1',
algorithm: 'sha1',
file: '.checksums',
file: '.checksums',
fileIndent: 4
fileIndent: 4
};
};


options = (typeof options === 'string') ? {namespace: options} : options;
options = (typeof options === 'string') ? {namespace: options} : options;


for (let key in options) {
for (let key in options) {
if (options.hasOwnProperty(key)) {
if (options.hasOwnProperty(key)) {
settings[key] = options[key];
settings[key] = options[key];
}
}
}
}


if (settings.file) {
if (settings.file) {


if (!fs.existsSync(settings.file)) {
if (!fs.existsSync(settings.file)) {
fs.writeFileSync(settings.file, JSON.stringify({}, null, settings.fileIndent));
fs.writeFileSync(settings.file, JSON.stringify({}, null, settings.fileIndent));
}
}


try {
try {
let content = fs.readFileSync(settings.file, 'utf8');
let content = fs.readFileSync(settings.file, 'utf8');


if (content) {
if (content) {
oncechecksums = JSON.parse(content);
oncechecksums = JSON.parse(content);
}
}
} catch (e) {
} catch (e) {
// go on about our business
// go on about our business
console.log(e);
console.log(e);
}
}
}
}


if (!!settings.namespace && !oncechecksums[settings.namespace]) {
if (!!settings.namespace && !oncechecksums[settings.namespace]) {
oncechecksums[settings.namespace] = {};
oncechecksums[settings.namespace] = {};
}
}


stream._transform = function(file, encoding, next) {
stream._transform = function(file, encoding, next) {
var flow = this;


if (file.isBuffer()) {
if (file.isBuffer()) {


let filename = path.basename(file.path),
let filename = path.basename(file.path),
filechecksum = crypto
filechecksum = crypto
.createHash(settings.algorithm || 'sha1')
.createHash(settings.algorithm || 'sha1')
.update(file.contents.toString('utf8'))
.update(file.contents.toString('utf8'))
.digest('hex');
.digest('hex');


if (settings.namespace in oncechecksums) {
if (settings.namespace in oncechecksums) {


if (oncechecksums[settings.namespace][filename] === filechecksum) {
if (oncechecksums[settings.namespace][filename] === filechecksum) {
return next();
return next();
}
}


oncechecksums[settings.namespace][filename] = filechecksum;
oncechecksums[settings.namespace][filename] = filechecksum;
} else {
} else {


if (oncechecksums[filename] === filechecksum) {
if (oncechecksums[filename] === filechecksum) {
return next();
return next();
}
}


oncechecksums[filename] = filechecksum;
oncechecksums[filename] = filechecksum;
}
}


if (settings.file) {
if (settings.file) {
fs.writeFile(settings.file, JSON.stringify(oncechecksums, null, settings.fileIndent), error => {
fs.writeFile(settings.file, JSON.stringify(oncechecksums, null, settings.fileIndent), error => {
if (error) {
if (error) {
return next(new gutil.PluginError('gulp-once', error, {showStack: true}));
return next(new gutil.PluginError('gulp-once', error, {showStack: true}));
}
}
});
});
}
}

return next(null, file);
}
}

flow.push(file);
return next();
};
};


return stream;
return stream;
};
};
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