var fs = require('fs'),
    tmp = require('tmp'),
    setup = require('../../../middleware/changeLanguage');
const proxyquire = require('proxyquire').noCallThru();

// load middleware using the default pelias config
var load = function(){
  // adapter is driven by config
  var tmpfile = tmp.tmpNameSync({ postfix: '.json' });
  fs.writeFileSync( tmpfile, '{}', { encoding: 'utf8' } );
  process.env.PELIAS_CONFIG = tmpfile;
  var middleware = setup();
  delete process.env.PELIAS_CONFIG;
  return middleware;
};

module.exports.tests = {};

module.exports.tests.interface = function(test, common) {
  test('valid interface', function(t) {
    var middleware = load();
    t.equal(typeof middleware, 'function', 'middleware is a function');
    t.equal(middleware.length, 3, 'middleware is a function');
    t.end();
  });
};

module.exports.tests.isLanguageChangeRequired = function(test, common) {
  test('invalid query - null req/res', function(t) {
    var middleware = load();
    middleware(null, null, t.end);
  });

  test('invalid query - no results', function(t) {
    var req = { language: { iso6393: 'spa' } };
    var res = {};

    var middleware = load();
    middleware(req, res, function(){
      t.deepEqual( req, { language: { iso6393: 'spa' } } );
      t.deepEqual( res, {} );
      t.end();
    });
  });

  test('invalid query - empty results', function(t) {
    var req = { language: { iso6393: 'spa' } };
    var res = { data: [] };

    var middleware = load();
    middleware(req, res, function(){
      t.deepEqual( req, { language: { iso6393: 'spa' } } );
      t.deepEqual( res, { data: [] } );
      t.end();
    });
  });

  test('invalid query - no target language', function(t) {
    var req = {};
    var res = { data: [] };

    var middleware = load();
    middleware(req, res, function(){
      t.deepEqual( req, {} );
      t.deepEqual( res, { data: [] } );
      t.end();
    });
  });
};

// check the service is called and response mapped correctly
module.exports.tests.miss = function(test, common) {
  test('miss', function(t) {

    var req = { language: { iso6393: 'spa' } };
    var res = { data: [
      {
        layer: 'locality',
        name: { default: 'London' },
        parent: {
          locality_id: [ 101750367 ],
          locality: [ 'London' ]
        }
      },
      {
        layer: 'example',
        name: { default: 'London' },
        parent: {
          locality_id: [ 101735809 ],
          locaity: [ 'London' ]
        }
      }
    ]};

    var middleware = load();

    // mock out the transport
    middleware.transport.query = function mock( ids, cb ){
      t.deepEqual( ids, [ '101735809', '101750367' ] );
      t.equal( typeof cb, 'function' );
      cb( 'error' );
    };

    middleware(req, res, function(){
      t.deepEqual( res, { data: [
        {
          layer: 'locality',
          name: { default: 'London' },
          parent: {
            locality_id: [ 101750367 ],
            locality: [ 'London' ]
          }
        },
        {
          layer: 'example',
          name: { default: 'London' },
          parent: {
            locality_id: [ 101735809 ],
            locaity: [ 'London' ]
          }
        }
      ]});
      t.end();
    });
  });
};

// check the service is called and response mapped correctly
module.exports.tests.hit = function(test, common) {
  test('hit', function(t) {

    var req = { language: { iso6393: 'spa' } };
    var res = { data: [
      {
        layer: 'locality',
        name: { default: 'London' },
        parent: {
          locality_id: [ 101750367 ],
          locality: [ 'London' ]
        }
      },
      {
        layer: 'example',
        name: { default: 'London' },
        parent: {
          locality_id: [ 101735809 ],
          locality: [ 'London' ]
        }
      }
    ]};

    var middleware = load();

    // mock out the transport
    middleware.transport.query = function mock( ids, cb ){
      t.deepEqual( ids, [ '101735809', '101750367' ] );
      t.equal( typeof cb, 'function' );
      cb( null, {
        '101750367': {
          'names': {
            'default':['London'],
            'chi':['倫敦'],
            'spa':['Londres'],
            'eng':['London'],
            'hin':['लंदन'],
            'ara':['لندن'],
            'por':['Londres'],
            'ben':['লন্ডন'],
            'rus':['Лондон'],
            'jpn':['ロンドン'],
            'kor':['런던']
          }
        },
        '101735809': {
          'names':{
            'default':['London'],
            'eng':['London']
          }
        }
      });
    };

    middleware(req, res, function(){
      t.deepEqual( res, { data: [
        {
          layer: 'locality',
          name: { default: 'Londres' },
          parent: {
            locality_id: [ 101750367 ],
            locality: [ 'Londres' ]
          }
        },
        {
          layer: 'example',
          name: { default: 'London' },
          parent: {
            locality_id: [ 101735809 ],
            locality: [ 'London' ]
          }
        }
      ]});
      t.end();
    });
  });

  test('empty array name translation should not change the value', t => {
    t.plan(2);

    const req = { language: { iso6393: 'ISO3 value' } };
    const res = {
      data: [
        {
          layer: 'locality',
          name: { default: 'original name' },
          parent: {
            locality_id: [ 123 ],
            locality: [ 'original name' ]
          }
        }
      ]
    };

    const changeLanguage = proxyquire('../../../middleware/changeLanguage', {
      '../service/language': {
        findById: () => ({
          query: (ids, callback) => {
            t.deepEquals(ids, ['123']);
            callback(null, {
              '123': {
                'names': {
                  'ISO3 value':[]
                }
              }
            });
          }
        })
      }
    })();

    changeLanguage(req, res, () => {
      t.deepEqual( res, { data: [
        {
          layer: 'locality',
          name: {
            default: 'original name'
          },
          parent: {
            locality_id: [ 123 ],
            locality: [ 'original name' ]
          }
        }
      ]});

    });

  });

};

module.exports.all = function (tape, common) {

  function test(name, testFunction) {
    return tape('[middleware] changeLanguage: ' + name, testFunction);
  }

  for( var testCase in module.exports.tests ){
    module.exports.tests[testCase](test, common);
  }
};