var should = require('./init.js');
var assert = require('assert');
var Schema = require('loopback-datasource-juggler').Schema;

var db, UserData, StringData, NumberData, DateData;

describe('migrations', function () {

  before(setup);

  it('should run migration', function (done) {
    db.automigrate(function () {
      done();
    });
  });

  it('UserData should have correct columns', function (done) {
    getFields('UserData', function (err, fields) {
      assert.deepEqual(fields, {
        id: {
          Field: 'id',
          Type: 'int(11)',
          Null: 'NO',
          Key: 'PRI',
          Default: null,
          Extra: 'auto_increment' },
        email: {
          Field: 'email',
          Type: 'varchar(512)',
          Null: 'NO',
          Key: 'MUL',
          Default: null,
          Extra: '' },
        name: {
          Field: 'name',
          Type: 'varchar(512)',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        bio: {
          Field: 'bio',
          Type: 'text',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        birthDate: {
          Field: 'birthDate',
          Type: 'datetime',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        pendingPeriod: {
          Field: 'pendingPeriod',
          Type: 'int(11)',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        createdByAdmin: {
          Field: 'createdByAdmin',
          Type: 'tinyint(1)',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' }
      });
      done();
    });
  });

  it('UserData should have correct indexes', function (done) {
    // Note: getIndexes truncates multi-key indexes to the first member. Hence index1 is correct.
    getIndexes('UserData', function (err, fields) {
      assert.deepEqual(fields, { PRIMARY: { Table: 'UserData',
        Non_unique: 0,
        Key_name: 'PRIMARY',
        Seq_in_index: 1,
        Column_name: 'id',
        Collation: 'A',
        Cardinality: 0,
        Sub_part: null,
        Packed: null,
        Null: '',
        Index_type: 'BTREE',
        Comment: '' },
        email: { Table: 'UserData',
          Non_unique: 1,
          Key_name: 'email',
          Seq_in_index: 1,
          Column_name: 'email',
          Collation: 'A',
          Cardinality: null,
          Sub_part: 333,
          Packed: null,
          Null: '',
          Index_type: 'BTREE',
          Comment: '' },
        index0: { Table: 'UserData',
          Non_unique: 1,
          Key_name: 'index0',
          Seq_in_index: 1,
          Column_name: 'email',
          Collation: 'A',
          Cardinality: null,
          Sub_part: 333,
          Packed: null,
          Null: '',
          Index_type: 'BTREE',
          Comment: '' }
      });
      done();
    });
  });

  it('StringData should have correct columns', function (done) {
    getFields('StringData', function (err, fields) {
      assert.deepEqual(fields, {
        idString: { Field: "idString",
          Type: 'varchar(255)',
          Null: 'NO',
          Key: 'PRI',
          Default: null,
          Extra: ''},
        smallString: { Field: 'smallString',
          Type: 'char(127)',
          Null: 'NO',
          Key: 'MUL',
          Default: null,
          Extra: '' },
        mediumString: { Field: 'mediumString',
          Type: 'varchar(255)',
          Null: 'NO',
          Key: '',
          Default: null,
          Extra: '' },
        tinyText: { Field: 'tinyText',
          Type: 'tinytext',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        giantJSON: { Field: 'giantJSON',
          Type: 'longtext',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        text: { Field: 'text',
          Type: 'varchar(1024)',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' }
      });
      done();
    });
  });

  it('NumberData should have correct columns', function (done) {
    getFields('NumberData', function (err, fields) {
      assert.deepEqual(fields, {
        id: { Field: 'id',
          Type: 'int(11)',
          Null: 'NO',
          Key: 'PRI',
          Default: null,
          Extra: 'auto_increment' },
        number: { Field: 'number',
          Type: 'decimal(10,3) unsigned',
          Null: 'NO',
          Key: 'MUL',
          Default: null,
          Extra: '' },
        tinyInt: { Field: 'tinyInt',
          Type: 'tinyint(2)',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        mediumInt: { Field: 'mediumInt',
          Type: 'mediumint(8) unsigned',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        floater: { Field: 'floater',
          Type: 'double(14,6)',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' }
      });
      done();
    });
  });

  it('DateData should have correct columns', function (done) {
    getFields('DateData', function (err, fields) {
      assert.deepEqual(fields, {
        id: { Field: 'id',
          Type: 'int(11)',
          Null: 'NO',
          Key: 'PRI',
          Default: null,
          Extra: 'auto_increment' },
        dateTime: { Field: 'dateTime',
          Type: 'datetime',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' },
        timestamp: { Field: 'timestamp',
          Type: 'timestamp',
          Null: 'YES',
          Key: '',
          Default: null,
          Extra: '' }
      });
      done();
    });
  });

  it('should autoupdate', function (done) {
    var userExists = function (cb) {
      query('SELECT * FROM UserData', function (err, res) {
        cb(!err && res[0].email == 'test@example.com');
      });
    }

    UserData.create({email: 'test@example.com'}, function (err, user) {
      assert.ok(!err, 'Could not create user: ' + err);
      userExists(function (yep) {
        assert.ok(yep, 'User does not exist');
      });
      UserData.defineProperty('email', { type: String });
      UserData.defineProperty('name', {type: String, dataType: 'char', limit: 50});
      UserData.defineProperty('newProperty', {type: Number, unsigned: true, dataType: 'bigInt'});
      // UserData.defineProperty('pendingPeriod', false); This will not work as expected.
      db.autoupdate(function (err) {
        getFields('UserData', function (err, fields) {
          // change nullable for email
          assert.equal(fields.email.Null, 'YES', 'Email does not allow null');
          // change type of name
          assert.equal(fields.name.Type, 'char(50)', 'Name is not char(50)');
          // add new column
          assert.ok(fields.newProperty, 'New column was not added');
          if (fields.newProperty) {
            assert.equal(fields.newProperty.Type, 'bigint(20) unsigned', 'New column type is not bigint(20) unsigned');
          }
          // drop column - will not happen.
          // assert.ok(!fields.pendingPeriod, 'Did not drop column pendingPeriod');
          // user still exists
          userExists(function (yep) {
            assert.ok(yep, 'User does not exist');
            done();
          });
        });
      });
    });
  });

  it('should check actuality of dataSource', function (done) {
    // 'drop column'
    UserData.dataSource.isActual(function (err, ok) {
      assert.ok(ok, 'dataSource is not actual (should be)');
      UserData.defineProperty('essay', {type: Schema.Text});
      // UserData.defineProperty('email', false); Can't undefine currently.
      UserData.dataSource.isActual(function (err, ok) {
        assert.ok(!ok, 'dataSource is actual (shouldn\t be)');
        done()
      });
    });
  });

  it('should allow numbers with decimals', function (done) {
    NumberData.create({number: 1.1234567, tinyInt: 123456, mediumInt: -1234567, floater: 123456789.1234567 }, function (err, obj) {
      assert.ok(!err);
      assert.ok(obj);
      NumberData.findById(obj.id, function (err, found) {
        assert.equal(found.number, 1.123);
        assert.equal(found.tinyInt, 127);
        assert.equal(found.mediumInt, 0);
        assert.equal(found.floater, 99999999.999999);
        done();
      });
    });
  });

  it('should allow both kinds of date columns', function (done) {
    DateData.create({
      dateTime: new Date('Aug 9 1996 07:47:33 GMT'),
      timestamp: new Date('Sep 22 2007 17:12:22 GMT')
    }, function (err, obj) {
      assert.ok(!err);
      assert.ok(obj);
      DateData.findById(obj.id, function (err, found) {
        assert.equal(found.dateTime.toGMTString(), 'Fri, 09 Aug 1996 07:47:33 GMT');
        assert.equal(found.timestamp.toGMTString(), 'Sat, 22 Sep 2007 17:12:22 GMT');
        done();
      });
    });
  });

  it('should report errors for automigrate', function() {
    db.automigrate('XYZ', function(err) {
      assert(err);
    });
  });

  it('should report errors for autoupdate', function() {
    db.autoupdate('XYZ', function(err) {
      assert(err);
    });
  });

  it('should disconnect when done', function (done) {
    db.disconnect();
    done();
  });

});

function setup(done) {

  require('./init.js');

  db = getSchema();

  UserData = db.define('UserData', {
    email: { type: String, null: false, index: true },
    name: String,
    bio: Schema.Text,
    birthDate: Date,
    pendingPeriod: Number,
    createdByAdmin: Boolean,
  }, { indexes: {
    index0: {
      columns: 'email, createdByAdmin'
    }
  }
  });

  StringData = db.define('StringData', {
    idString: {type: String, id: true},
    smallString: {type: String, null: false, index: true, dataType: 'char', limit: 127},
    mediumString: {type: String, null: false, dataType: 'varchar', limit: 255},
    tinyText: {type: String, dataType: 'tinyText'},
    giantJSON: {type: Schema.JSON, dataType: 'longText'},
    text: {type: Schema.Text, dataType: 'varchar', limit: 1024}
  });

  NumberData = db.define('NumberData', {
    number: {type: Number, null: false, index: true, unsigned: true, dataType: 'decimal', precision: 10, scale: 3},
    tinyInt: {type: Number, dataType: 'tinyInt', display: 2},
    mediumInt: {type: Number, dataType: 'mediumInt', unsigned: true},
    floater: {type: Number, dataType: 'double', precision: 14, scale: 6}
  });

  DateData = db.define('DateData', {
    dateTime: {type: Date, dataType: 'datetime'},
    timestamp: {type: Date, dataType: 'timestamp'}
  });

  blankDatabase(db, done);

}

var query = function (sql, cb) {
  db.adapter.query(sql, cb);
};

var blankDatabase = function (db, cb) {
  var dbn = db.settings.database;
  var cs = db.settings.charset;
  var co = db.settings.collation;
  query('DROP DATABASE IF EXISTS ' + dbn, function (err) {
    var q = 'CREATE DATABASE ' + dbn;
    if (cs) {
      q += ' CHARACTER SET ' + cs;
    }
    if (co) {
      q += ' COLLATE ' + co;
    }
    query(q, function (err) {
      query('USE ' + dbn, cb);
    });
  });
};

getFields = function (model, cb) {
  query('SHOW FIELDS FROM ' + model, function (err, res) {
    if (err) {
      cb(err);
    } else {
      var fields = {};
      res.forEach(function (field) {
        fields[field.Field] = field;
      });
      cb(err, fields);
    }
  });
}

getIndexes = function (model, cb) {
  query('SHOW INDEXES FROM ' + model, function (err, res) {
    if (err) {
      console.log(err);
      cb(err);
    } else {
      var indexes = {};
      // Note: this will only show the first key of compound keys
      res.forEach(function (index) {
        if (parseInt(index.Seq_in_index, 10) == 1) {
          indexes[index.Key_name] = index
        }
      });
      cb(err, indexes);
    }
  });
};