var fs = require('fs');
var assert = require('assert');
var path = require('path');
var tmp = require('tmp');
var find = require('..');

tmp.setGracefulCleanup();

function createBy(type) {
  return function(dir, num, ext) {
    var targets = [];
    num = num || 1;
    if (Array.isArray(dir)) dir = dir[0];
    var opts = { template: path.join(dir, '/tmp-XXXXXX' + (ext || '')) };
    for (var i = 0; i < num; ++i) {
      targets.push(tmp[type + 'Sync'](opts).name);
    }
    return targets;
  }
}

function assertEqual(a, b) {
  assert.deepEqual(a.sort(), b.sort());
}


var createFilesUnder = createBy('file');
var createDirUnder = createBy('dir');

function createNestedDirs(testdir) {
  var level1 = createDirUnder(testdir)[0];
  var level2 = createDirUnder(level1)[0];
  var level22 = createDirUnder(level1)[0];
  var level3 = createDirUnder(level2)[0];
  return [level1, level2, level22, level3];
}

describe('API test', function() {
  var testdir;

  beforeEach(function(done) {
    tmp.dir({unsafeCleanup: true}, function(err, dir) {
      if (err) return done(err);
      testdir = dir;
      done();
    });
  });

  it('`find.file()` should find all files and returns as an array in callback', function(done) {
    var expect = createFilesUnder(testdir, 3);
    find.file(testdir, function(found) {
      assertEqual(expect, found);
      done();
    });
  });

  it('`find.file()` should find recursively', function(done) {
    var expect = createFilesUnder(testdir, 3);
    var level1 = createDirUnder(testdir);
    expect = expect.concat(createFilesUnder(testdir, 2));

    find.file(testdir, function(found) {
      assertEqual(expect, found);
      done();
    });
  });

  it('`find.dir()` should find all dirs just like find.file()', function(done) {
    var expect = createNestedDirs(testdir);
    find.dir(testdir, function(found) {
      assertEqual(expect, found);
      done();
    });
  });

  it('`find.eachfile()` should find all files and process one by one', function(done) {
    var expect = createFilesUnder(testdir, 3);
    count = 0;
    find.eachfile(testdir, function(thisfile) {
      assert(expect.indexOf(thisfile) > -1);
      count++;
    }).end(function() {
      assert(count == expect.length);
      done();
    });
  });

  it('`find.eachdir()` should find all dirs just like find.eachfile()', function(done) {
    var expect = createNestedDirs(testdir);
    var count = 0;
    find.eachdir(testdir, function(thisdir) {
      assert(expect.indexOf(thisdir) > -1);
      count++;
    }).end(function() {
      assert(count == expect.length);
      done();
    });
  });

  it('`find.fileSync()` should find all files synchronously', function() {
    var expect = createFilesUnder(testdir, 3);
    var found = find.fileSync(testdir);
    assertEqual(expect, found);
  });

  it('`find.dirSync()` should find all dirs synchronously', function() {
    var expect = createNestedDirs(testdir, 3);
    var found = find.dirSync(testdir);
    assertEqual(expect, found);
  });

  it('`find.*` should find by name', function(done) {
    var expect = createFilesUnder(testdir, 3);
    var first = expect[0];
    find.file(path.basename(first), testdir, function(found) {
      assert.equal(first, found[0]);
      done();
    });
  });

  it('`find.*` should find by regular expression', function() {
    var html = createFilesUnder(testdir, 1, '.html');
    var js = createFilesUnder(testdir, 2, '.js');

    htmlAll = find.fileSync(/\.html$/, testdir);
    assert.equal( html.join(''), htmlAll.join(''));

    jsAll = find.fileSync(/\.js$/, testdir);
    assertEqual(js, jsAll);
  });

  it('`find.*` should follow file symbolic links', function(done) {
    var files = createFilesUnder(testdir, 2);
    var srcfile = files[0];
    var linkfile = srcfile + '-link';
    files.push(linkfile);
    fs.symlinkSync(srcfile, linkfile, 'file');

    var allfile = find.fileSync(testdir);
    assertEqual(files, allfile);

    find.file(testdir, function(found) {
      assertEqual(files, found);
      done();
    });
  });

  it('`find.find(Sync)` should return the symbolic links directly which does not exist', function(done) {
    var files = createFilesUnder(testdir, 2);
    var srcfile = files[0];
    var linkfile = srcfile + '-link';
    fs.symlinkSync(srcfile, linkfile, 'file');
    fs.unlinkSync(srcfile);

    var expected = [files[1], linkfile];
    var found = find.fileSync(testdir);
    assertEqual(found, expected);

    find.file(testdir, function(found) {
      assertEqual(expected, found);
      done();
    });
  });

  it('`find.*` should follow direcotry symbolic links', function(done) {
    createFilesUnder(testdir, 2);
    var dir = createDirUnder(testdir)[0];
    var srcdir = createDirUnder(testdir)[0];
    var linkdir = srcdir + '-link';
    var dirs = [dir, srcdir, linkdir];

    fs.symlinkSync(srcdir, linkdir, 'dir');

    var alldir = find.dirSync(testdir);
    assertEqual(dirs, alldir);

    find.dir(testdir, function(found) {
      assertEqual(dirs, found);
      done();
    });
  });

  it('`find.dir(Sync)` should ignore circular symbolic links', function(done) {
    var dirs = createDirUnder(testdir, 2);
    var src = dirs[0];
    var remaining = dirs.slice(1);
    var a = src + '-link-a';
    var b = src + '-link-b';
    var c = src + '-link-c';

    fs.symlinkSync(src, a, 'dir');
    fs.symlinkSync(a, b, 'dir');
    fs.symlinkSync(b, c, 'dir');
    fs.rmdirSync(src);
    fs.symlinkSync(c, src, 'dir');

    var found = find.dirSync(testdir);
    assertEqual(remaining, found);

    find.dir(testdir, function(found) {
      assertEqual(remaining, found);
      done();
    })
  });

  it('`find.*` should find for a symbolic directory', function(done) {
    var expect = createFilesUnder(testdir, 2);
    var linkdir = testdir + '-link';

    fs.symlinkSync(testdir, linkdir, 'dir');

    var allfiles = find.fileSync(linkdir);
    assertEqual(
      expect.map(function(n) { return fs.realpathSync(n) }),
      allfiles.map(function(n) { return fs.realpathSync(n) })
    );

    find.file(linkdir, function(found) {
      assertEqual(
        expect.map(function(n) { return fs.realpathSync(n) }),
        found.map(function(n) { return fs.realpathSync(n) })
      );
      done();
    });
  });

  it('`find.*` should follow relative symbolic links', function(done) {
    var count = 2;
    var dir = createNestedDirs(testdir)[0];
    createFilesUnder(dir, count);

    var linkdir = dir + '-link';

    // create relative symbolic link
    process.chdir(path.dirname(dir));
    fs.symlinkSync(path.basename(dir), linkdir, 'dir');

    // move to somewhere else
    process.chdir(__dirname);
    var found = find.fileSync(linkdir);

    assert.equal(found.length, count);

    find.file(testdir, function(found) {
      assert.equal(found.length, count);
      done();
    });
  });

  it('`.error()`should catch exceptions', function(done) {
    var catched;
    try {
      find
        .file('__not_exist', function(f) { })
        .error(function(err) {
          catched = true;
        });
    } catch(e) {
      catched = false;
    }
    setTimeout(function() {
      assert(catched);
      done();
    });
  });

  it('should throw exception at root which does not exist', function(done) {
    var catched = false;
    try {
      find.fileSync('__not_exist');
    } catch(e) {
      catched = true;
    }
    setTimeout(function() {
      assert(catched);
      done();
    });
  });

});