// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var common = require('../common');
var assert = require('assert');

var path = require('path'),
    fs = require('fs'),
    util = require('util');


var filepath = path.join(common.tmpDir, 'write_pos.txt');


var cb_expected = 'write open close write open close write open close ',
    cb_occurred = '';

var fileDataInitial = 'abcdefghijklmnopqrstuvwxyz';

var fileDataExpected_1 = 'abcdefghijklmnopqrstuvwxyz';
var fileDataExpected_2 = 'abcdefghij123456qrstuvwxyz';
var fileDataExpected_3 = 'abcdefghij\u2026\u2026qrstuvwxyz';


process.on('exit', function() {
  removeTestFile();
  if ( cb_occurred !== cb_expected) {
    console.log('  Test callback events missing or out of order:');
    console.log('    expected: %j', cb_expected);
    console.log('    occurred: %j', cb_occurred);
    assert.strictEqual(cb_occurred, cb_expected,
          'events missing or out of order: "' +
          cb_occurred + '" !== "' + cb_expected + '"');
  }
});

function removeTestFile() {
  try {
    fs.unlinkSync(filepath);
  } catch (ex) { }
}


removeTestFile();


function run_test_1() {
  var file, buffer, options;

  options = {};
  file = fs.createWriteStream(filepath, options);
  console.log('    (debug: start         ', file.start);
  console.log('    (debug: pos           ', file.pos);

  file.on('open', function(fd) {
    cb_occurred += 'open ';
  });

  file.on('close', function() {
    cb_occurred += 'close ';
    console.log('    (debug: bytesWritten  ', file.bytesWritten);
    console.log('    (debug: start         ', file.start);
    console.log('    (debug: pos           ', file.pos);
    assert.strictEqual(file.bytesWritten, buffer.length);
    var fileData = fs.readFileSync(filepath, 'utf8');
    console.log('    (debug: file data   ', fileData);
    console.log('    (debug: expected    ', fileDataExpected_1);
    assert.equal(fileData, fileDataExpected_1);

    run_test_2();
  });

  file.on('error', function(err) {
    cb_occurred += 'error ';
    console.log('    (debug: err event ', err);
    throw err;
  });

  buffer = new Buffer(fileDataInitial);
  file.write(buffer);
  cb_occurred += 'write ';

  file.end();
}


function run_test_2() {
  var file, buffer, options;

  buffer = new Buffer('123456');

  options = { start: 10,
              flags: 'r+' };
  file = fs.createWriteStream(filepath, options);
  console.log('    (debug: start         ', file.start);
  console.log('    (debug: pos           ', file.pos);

  file.on('open', function(fd) {
    cb_occurred += 'open ';
  });

  file.on('close', function() {
    cb_occurred += 'close ';
    console.log('    (debug: bytesWritten  ', file.bytesWritten);
    console.log('    (debug: start         ', file.start);
    console.log('    (debug: pos           ', file.pos);
    assert.strictEqual(file.bytesWritten, buffer.length);
    var fileData = fs.readFileSync(filepath, 'utf8');
    console.log('    (debug: file data   ', fileData);
    console.log('    (debug: expected    ', fileDataExpected_2);
    assert.equal(fileData, fileDataExpected_2);

    run_test_3();
  });

  file.on('error', function(err) {
    cb_occurred += 'error ';
    console.log('    (debug: err event ', err);
    throw err;
  });

  file.write(buffer);
  cb_occurred += 'write ';

  file.end();
}


function run_test_3() {
  var file, buffer, options;

  var data = '\u2026\u2026',    // 3 bytes * 2 = 6 bytes in UTF-8
      fileData;

  options = { start: 10,
              flags: 'r+' };
  file = fs.createWriteStream(filepath, options);
  console.log('    (debug: start         ', file.start);
  console.log('    (debug: pos           ', file.pos);

  file.on('open', function(fd) {
    cb_occurred += 'open ';
  });

  file.on('close', function() {
    cb_occurred += 'close ';
    console.log('    (debug: bytesWritten  ', file.bytesWritten);
    console.log('    (debug: start         ', file.start);
    console.log('    (debug: pos           ', file.pos);
    assert.strictEqual(file.bytesWritten, data.length * 3);
    fileData = fs.readFileSync(filepath, 'utf8');
    console.log('    (debug: file data   ', fileData);
    console.log('    (debug: expected    ', fileDataExpected_3);
    assert.equal(fileData, fileDataExpected_3);

    run_test_4();
  });

  file.on('error', function(err) {
    cb_occurred += 'error ';
    console.log('    (debug: err event ', err);
    throw err;
  });

  file.write(data, 'utf8');
  cb_occurred += 'write ';

  file.end();
}


function run_test_4() {
  var file, options;

  options = { start: -5,
              flags: 'r+' };

  //  Error: start must be >= zero
  assert.throws(
    function() {
      file = fs.createWriteStream(filepath, options);
    },
    /start must be/
  );

}

run_test_1();