/*global after, before, describe, expect, it*/
'use strict';

const equal = require('assert').equal;
const path = require('path');
const rimraf = require('rimraf');
const Promise = require('bluebird');
const testMemoryMigrations = require('./memory-migrations');

module.exports = function(knex) {
  require('rimraf').sync(path.join(__dirname, './migration'));

  before(function() {
    // make sure lock was not left from previous failed test run
    return knex.migrate.forceFreeMigrationsLock({
      directory: 'test/integration/migrate/test',
    });
  });

  describe('knex.migrate', function() {
    it('should create a new migration file with the create method', function() {
      return knex.migrate.make('test').then(function(name) {
        name = path.basename(name);
        expect(name.split('_')[0]).to.have.length(14);
        expect(name.split('_')[1].split('.')[0]).to.equal('test');
      });
    });

    it('should list the current migration state with the currentVersion method', function() {
      return knex.migrate.currentVersion().then(function(version) {
        equal(version, 'none');
      });
    });

    const tables = [
      'migration_test_1',
      'migration_test_2',
      'migration_test_2_1',
    ];

    describe('knex.migrate.status', function() {
      this.timeout(process.env.KNEX_TEST_TIMEOUT || 30000);

      beforeEach(function() {
        return knex.migrate.latest({
          directory: 'test/integration/migrate/test',
        });
      });

      afterEach(function() {
        return knex.migrate.rollback({
          directory: 'test/integration/migrate/test',
        });
      });

      it('should create a migrations lock table', function() {
        return knex.schema
          .hasTable('knex_migrations_lock')
          .then(function(exists) {
            expect(exists).to.equal(true);

            return knex.schema
              .hasColumn('knex_migrations_lock', 'is_locked')
              .then(function(exists) {
                expect(exists).to.equal(true);
              });
          });
      });

      it('should return 0 if code matches DB', function() {
        return knex.migrate
          .status({ directory: 'test/integration/migrate/test' })
          .then(function(migrationLevel) {
            expect(migrationLevel).to.equal(0);
          });
      });

      it('should return a negative number if the DB is behind', function() {
        return knex.migrate
          .rollback({ directory: 'test/integration/migrate/test' })
          .then(function() {
            return knex.migrate
              .status({ directory: 'test/integration/migrate/test' })
              .then(function(migrationLevel) {
                expect(migrationLevel).to.equal(-2);
              });
          });
      });

      it('should return a positive number if the DB is ahead', function() {
        return Promise.all([
          knex('knex_migrations')
            .returning('id')
            .insert({
              name: 'foobar',
              batch: 5,
              migration_time: new Date(),
            }),
          knex('knex_migrations')
            .returning('id')
            .insert({
              name: 'foobar',
              batch: 5,
              migration_time: new Date(),
            }),
          knex('knex_migrations')
            .returning('id')
            .insert({
              name: 'foobarbaz',
              batch: 6,
              migration_time: new Date(),
            }),
        ]).spread(function(migration1, migration2, migration3) {
          return knex.migrate
            .status({ directory: 'test/integration/migrate/test' })
            .then(function(migrationLevel) {
              expect(migrationLevel).to.equal(3);
            })
            .then(function() {
              // Cleanup the added migrations
              if (/redshift/.test(knex.client.driverName)) {
                return knex('knex_migrations')
                  .where('name', 'like', '%foobar%')
                  .del();
              }
              return knex('knex_migrations')
                .where('id', migration1[0])
                .orWhere('id', migration2[0])
                .orWhere('id', migration3[0])
                .del();
            });
        });
      });
    });

    describe('knex.migrate.latest', function() {
      before(function() {
        return knex.migrate.latest({
          directory: 'test/integration/migrate/test',
        });
      });

      it('should remove the record in the lock table once finished', function() {
        return knex('knex_migrations_lock')
          .select('*')
          .then(function(data) {
            expect(data[0]).to.have.property('is_locked');
            expect(data[0].is_locked).to.not.be.ok;
          });
      });

      it('should throw error if the migrations are already running', function() {
        return knex('knex_migrations_lock')
          .update({ is_locked: 1 })
          .then(function() {
            return knex.migrate
              .latest({ directory: 'test/integration/migrate/test' })
              .then(function() {
                throw new Error('then should not execute');
              });
          })
          .catch(function(error) {
            expect(error).to.have.property(
              'message',
              'Migration table is already locked'
            );
            return knex('knex_migrations_lock').select('*');
          })
          .then(function(data) {
            expect(data[0].is_locked).to.equal(1);

            // Clean up lock for other tests
            return knex('knex_migrations_lock').update({ is_locked: 0 });
          });
      });

      it('should release lock if non-locking related error is thrown', function() {
        return knex.migrate
          .latest({ directory: 'test/integration/migrate/test' })
          .then(function() {
            throw new Error('then should not execute');
          })
          .catch(function(error) {
            // This will fail because of the invalid migration
            expect(error).to.have.property('message');
            return knex('knex_migrations_lock').select('*');
          })
          .then(function(data) {
            expect(data[0].is_locked).to.not.be.ok;
          });
      });

      it('should run all migration files in the specified directory', function() {
        return knex('knex_migrations')
          .select('*')
          .then(function(data) {
            expect(data.length).to.equal(2);
          });
      });

      it('should run the migrations from oldest to newest', function() {
        if (knex.client.driverName === 'oracledb') {
          return knex('knex_migrations')
            .orderBy('migration_time', 'asc')
            .select('*')
            .then(function(data) {
              expect(path.basename(data[0].name)).to.equal(
                '20131019235242_migration_1.js'
              );
              expect(path.basename(data[1].name)).to.equal(
                '20131019235306_migration_2.js'
              );
            });
        } else {
          return knex('knex_migrations')
            .orderBy('id', 'asc')
            .select('*')
            .then(function(data) {
              expect(path.basename(data[0].name)).to.equal(
                '20131019235242_migration_1.js'
              );
              expect(path.basename(data[1].name)).to.equal(
                '20131019235306_migration_2.js'
              );
            });
        }
      });

      it('should create all specified tables and columns', function() {
        // Map the table names to promises that evaluate chai expectations to
        // confirm that the table exists and the 'id' and 'name' columns exist
        // within the table
        return Promise.map(tables, function(table) {
          return knex.schema.hasTable(table).then(function(exists) {
            expect(exists).to.equal(true);
            if (exists) {
              return Promise.all([
                knex.schema.hasColumn(table, 'id').then(function(exists) {
                  expect(exists).to.equal(true);
                }),
                knex.schema.hasColumn(table, 'name').then(function(exists) {
                  expect(exists).to.equal(true);
                }),
              ]);
            }
          });
        });
      });
    });

    describe('knex.migrate.latest - multiple directories', () => {
      before(() => {
        return knex.migrate.latest({
          directory: [
            'test/integration/migrate/test',
            'test/integration/migrate/test2',
          ],
        });
      });

      after(() => {
        return knex.migrate.rollback({
          directory: [
            'test/integration/migrate/test',
            'test/integration/migrate/test2',
          ],
        });
      });

      it('should create tables specified in both directories', () => {
        // Map the table names to promises that evaluate chai expectations to
        // confirm that the table exists
        const expectedTables = [
          'migration_test_1',
          'migration_test_2',
          'migration_test_2_1',
          'migration_test_3',
          'migration_test_4',
          'migration_test_4_1',
        ];

        return Promise.map(expectedTables, function(table) {
          return knex.schema.hasTable(table).then(function(exists) {
            expect(exists).to.equal(true);
          });
        });
      });
    });

    describe('knex.migrate.rollback', function() {
      it('should delete the most recent batch from the migration log', function() {
        return knex.migrate
          .rollback({ directory: 'test/integration/migrate/test' })
          .spread(function(batchNo, log) {
            expect(batchNo).to.equal(1);
            expect(log).to.have.length(2);
            var migrationPath = ['test', 'integration', 'migrate', 'test'].join(
              path.sep
            ); //Test fails on windows if explicitly defining /test/integration/.. ~wubzz
            expect(log[0]).to.contain(batchNo);
            return knex('knex_migrations')
              .select('*')
              .then(function(data) {
                expect(data.length).to.equal(0);
              });
          });
      });

      it('should drop tables as specified in the batch', function() {
        return Promise.map(tables, function(table) {
          return knex.schema.hasTable(table).then(function(exists) {
            expect(!!exists).to.equal(false);
          });
        });
      });
    });

    after(function() {
      rimraf.sync(path.join(__dirname, './migration'));
    });
  });

  describe('knex.migrate.latest in parallel', function() {
    afterEach(function() {
      return knex.migrate.rollback({
        directory: 'test/integration/migrate/test',
      });
    });

    if (knex.client.driverName === 'pg' || knex.client.driverName === 'mssql') {
      it('is able to run two migrations in parallel (if no implicit DDL commits)', function() {
        return Promise.all([
          knex.migrate.latest({ directory: 'test/integration/migrate/test' }),
          knex.migrate.latest({ directory: 'test/integration/migrate/test' }),
        ]).then(function() {
          return knex('knex_migrations')
            .select('*')
            .then(function(data) {
              expect(data.length).to.equal(2);
            });
        });
      });
    }

    it('is not able to run two migrations in parallel when transactions are disabled', function() {
      return Promise.map(
        [
          knex.migrate
            .latest({
              directory: 'test/integration/migrate/test',
              disableTransactions: true,
            })
            .catch(function(err) {
              return err;
            }),
          knex.migrate
            .latest({
              directory: 'test/integration/migrate/test',
              disableTransactions: true,
            })
            .catch(function(err) {
              return err;
            }),
        ],
        function(res) {
          return res && res.name;
        }
      ).then(function(res) {
        // One should fail:
        const hasLockError =
          res[0] === 'MigrationLocked' || res[1] === 'MigrationLocked';
        expect(hasLockError).to.equal(true);

        // But the other should succeed:
        return knex('knex_migrations')
          .select('*')
          .then(function(data) {
            expect(data.length).to.equal(2);
          });
      });
    });
  });

  describe('knex.migrate (transactions disabled)', function() {
    describe('knex.migrate.latest (all transactions disabled)', function() {
      before(function() {
        return knex.migrate
          .latest({
            directory: 'test/integration/migrate/test_with_invalid',
            disableTransactions: true,
          })
          .catch(function() {});
      });

      // Same test as before, but this time, because
      // transactions are off, the column gets created for all dialects always.
      it('should create column even in invalid migration', function() {
        return knex.schema
          .hasColumn('migration_test_1', 'transaction')
          .then(function(exists) {
            expect(exists).to.equal(true);
          });
      });

      after(function() {
        return knex.migrate.rollback({
          directory: 'test/integration/migrate/test_with_invalid',
        });
      });
    });

    describe('knex.migrate.latest (per-migration transaction disabled)', function() {
      before(function() {
        return knex.migrate
          .latest({
            directory:
              'test/integration/migrate/test_per_migration_trx_disabled',
          })
          .catch(function() {});
      });

      it('should run all working migration files in the specified directory', function() {
        return knex('knex_migrations')
          .select('*')
          .then(function(data) {
            expect(data.length).to.equal(1);
          });
      });

      it('should create column in invalid migration with transaction disabled', function() {
        return knex.schema
          .hasColumn('migration_test_trx_1', 'transaction')
          .then(function(exists) {
            expect(exists).to.equal(true);
          });
      });

      after(function() {
        return knex.migrate.rollback({
          directory: 'test/integration/migrate/test_per_migration_trx_disabled',
        });
      });
    });

    describe('knex.migrate.latest (per-migration transaction enabled)', function() {
      before(function() {
        return knex.migrate
          .latest({
            directory:
              'test/integration/migrate/test_per_migration_trx_enabled',
            disableTransactions: true,
          })
          .catch(function() {});
      });

      it('should run all working migration files in the specified directory', function() {
        return knex('knex_migrations')
          .select('*')
          .then(function(data) {
            expect(data.length).to.equal(1);
          });
      });

      it('should not create column for invalid migration with transaction enabled', function() {
        return knex.schema
          .hasColumn('migration_test_trx_1', 'transaction')
          .then(function(exists) {
            // MySQL / Oracle commit transactions implicit for most common
            // migration statements (e.g. CREATE TABLE, ALTER TABLE, DROP TABLE),
            // so we need to check for dialect
            if (
              knex.client.driverName === 'mysql' ||
              knex.client.driverName === 'mysql2' ||
              knex.client.driverName === 'oracledb'
            ) {
              expect(exists).to.equal(true);
            } else {
              expect(exists).to.equal(false);
            }
          });
      });

      after(function() {
        return knex.migrate.rollback({
          directory: 'test/integration/migrate/test_per_migration_trx_enabled',
        });
      });
    });

    if (knex.client.driverName === 'pg') {
      describe('knex.migrate.latest with specific changelog schema', function() {
        before(() => {
          return knex.raw(`CREATE SCHEMA IF NOT EXISTS "testschema"`);
        });
        after(() => {
          return knex.raw(`DROP SCHEMA "testschema" CASCADE`);
        });

        it('should create changelog in the correct schema without transactions', function(done) {
          knex.migrate
            .latest({
              directory: 'test/integration/migrate/test',
              disableTransactions: true,
              schemaName: 'testschema',
            })
            .then(() => {
              return knex('testschema.knex_migrations')
                .select('*')
                .then(function(data) {
                  expect(data.length).to.equal(2);
                  done();
                });
            });
        });

        it('should create changelog in the correct schema with transactions', function(done) {
          knex.migrate
            .latest({
              directory: 'test/integration/migrate/test',
              disableTransactions: false,
              schemaName: 'testschema',
            })
            .then(() => {
              return knex('testschema.knex_migrations')
                .select('*')
                .then(function(data) {
                  expect(data.length).to.equal(2);
                  done();
                });
            });
        });

        afterEach(function() {
          return knex.migrate.rollback({
            directory: 'test/integration/migrate/test',
            disableTransactions: true,
            schemaName: 'testschema',
          });
        });
      });
    }
  });

  describe('migrationSource config', function() {
    const migrationSource = {
      getMigrations() {
        console.log('???', Object.keys(testMemoryMigrations).sort());
        return Promise.resolve(Object.keys(testMemoryMigrations).sort());
      },
      getMigrationName(migration) {
        return migration;
      },
      getMigration(migration) {
        return testMemoryMigrations[migration];
      },
    };

    before(() => {
      return knex.migrate.latest({
        migrationSource,
      });
    });

    after(() => {
      return knex.migrate.rollback({
        migrationSource,
      });
    });

    it('can accept a custom migration source', function() {
      return knex.schema
        .hasColumn('migration_source_test_1', 'name')
        .then(function(exists) {
          expect(exists).to.equal(true);
        });
    });
  });
};