var app = require('http').createServer(handler)
var io = require('socket.io')(app);
var fs = require('fs');
var request = require('request');
var progress = require('request-progress');
const path = require('path')
const url = require('url')
const os = require('os')
const sha256 = require('sha256')
const crypto = require('crypto')
Promise = require('bluebird');

app.listen(3000);

function handler (req, res) {
  fs.readFile(__dirname + '/index.html',
  function (err, data) {
    if (err) {
      res.writeHead(500);
      return res.end('Error loading index.html');
    }

    res.writeHead(200);
    res.end(data);
  });
}

if (os.platform() === 'darwin') {
    var PARAMS_DIR = process.env.HOME + '/Library/Application Support/ZcashParams'
}
if (os.platform() === 'linux') {
    var PARAMS_DIR = process.env.HOME + '/.zcash-params'
}


//PARAMS_DIR="$HOME/Library/Application Support/ZcashParams"

var SPROUT_FILES_DATA = [{"file":"sprout-proving.key","hash":"8bc20a7f013b2b58970cddd2e7ea028975c88ae7ceb9259a5344a16bc2c0eef7"},{"file":"sprout-verifying.key","hash":"4bd498dae0aacfd8e98dc306338d017d9c08dd0918ead18172bd0aec2fc5df82"}]
var SPROUT_DL_URL="https://z.cash/downloads/"

//console.log(SPROUT_FILES_DATA);

SPROUT_FILES_DATA.forEach(function (value, index) {
    //console.log(index);
    //console.log(value);
    //console.log(value.file);
    //console.log(value.hash);

    fs.exists(value.file, function(exists) {
        if (exists) {
            console.log(value.file + ' already exists at location.');
            var tmphash

            var fd = fs.createReadStream(value.file);
            var hash = crypto.createHash('sha256')
                hash.setEncoding('hex');

            fd.on('end', function() {
                hash.end();
                console.log('hash is: ')
                console.log(hash.read()); // the desired sha1sum
                console.log(value.hash)
                tmphash = hash.read();
                if (hash.read() === value.hash) {
                    console.log('File SHA256 sum matches.')
                } else {
                    console.log('File SHA256 sum does not match.')
                }
            });
            // read all file and pipe it (write it) to the hash object
            fd.pipe(hash);

        } else {
            var DLFile = function() {

                return new Promise(function(resolve, reject) {
                    
                    console.log('file not there.');

                    progress(request(SPROUT_DL_URL+value.file), {})
                    .on('progress', function (state) {
                        console.log('progress', state);
                    })
                    .on('error', function (err) {
                        console.log(err);
                    })
                    .on('end', function () {
                        // Do something after request finishes 
                        console.log('download finished.')
                        var result = 'File ==> ' + value.file + ': DOWNLOADED'
                    })
                    .pipe(fs.createWriteStream(value.file));

                    console.log(result)
                    resolve(result);
                })
            }


            var CheckFileSHA = function() {

                return new Promise(function(resolve, reject) {
                    var fd = fs.createReadStream(value.file);
                    var hash = crypto.createHash('sha256')
                        hash.setEncoding('hex');

                    fd.on('end', function() {
                        hash.end();
                        console.log('hash is: ')
                        console.log(hash.read()); // the desired sha1sum
                        console.log(value.hash)
                        if (hash.read() === value.hash) {
                            console.log('File SHA256 sum matches.')
                        } else {
                            console.log('File SHA256 sum does not match.')
                        }
                    });
                    // read all file and pipe it (write it) to the hash object
                    fd.pipe(hash);

                    var result = 'SHA256 SUM Check: DONE'

                    console.log(result)
                    resolve(result);
                })
            }


            DLFile()
            .then(function(result) { 
                return CheckFileSHA();
            })
        }
    });
    
});


function CheckSHASum(file, hashstr) {
    console.log(hashstr)
    var shasum
    
    // the file you want to get the hash    
    

    if (shasum === hashstr ) {
        return true
    } else return false
}


/*var CheckFileExists = function() {

    return new Promise(function(resolve, reject) {
        
        if (path.existsSync('foo.txt')) {}
        var result = 'Connecting To Pm2: done'

        console.log(result)
        resolve(result);
    })
}

var DLFile = function() {

    return new Promise(function(resolve, reject) {
        var result = 'Killing Pm2: done'

        setTimeout(function() {
            console.log(result)
            resolve(result);
        }, 2000)
    })
}

var CheckSHASum = function() {

    return new Promise(function(resolve, reject) {
        var result = 'Hiding Main Window: done'

        console.log(result)
        resolve(result);
    })
}

var MoveFile = function() {

    return new Promise(function(resolve, reject) {
        var result = 'Quiting App: done'

        console.log(result)
        resolve(result);
    })
}

ConnectToPm2()
.then(function(result) { 
    return KillPm2();
})
.then(HideMainWindow)
.then(QuitApp)
*/