'use strict';

require('../../helper');

var BATCH_SOURCE = '../../../batch/';

var assert = require('../../support/assert');
var redisUtils = require('../../support/redis_utils');
var _ = require('underscore');
var RedisPool = require('redis-mpool');

var UserIndexer = require(BATCH_SOURCE + 'user_indexer');
var JobQueue = require(BATCH_SOURCE + 'job_queue');
var JobBackend = require(BATCH_SOURCE + 'job_backend');
var JobPublisher = require(BATCH_SOURCE + 'job_publisher');
var jobStatus = require(BATCH_SOURCE + 'job_status');
var UserDatabaseMetadataService = require(BATCH_SOURCE + 'user_database_metadata_service');
var JobCanceller = require(BATCH_SOURCE + 'job_canceller');
var JobService = require(BATCH_SOURCE + 'job_service');
var PSQL = require('cartodb-psql');

var redisConfig = {
    host: global.settings.redis_host,
    port: global.settings.redis_port,
    max: global.settings.redisPool,
    idleTimeoutMillis: global.settings.redisIdleTimeoutMillis,
    reapIntervalMillis: global.settings.redisReapIntervalMillis
};

var metadataBackend = require('cartodb-redis')(redisConfig);
var redisPoolPublisher = new RedisPool(_.extend(redisConfig, { name: 'batch-publisher'}));
var jobPublisher = new JobPublisher(redisPoolPublisher);
var jobQueue =  new JobQueue(metadataBackend, jobPublisher);
var userIndexer = new UserIndexer(metadataBackend);
var jobBackend = new JobBackend(metadataBackend, jobQueue, userIndexer);
var userDatabaseMetadataService = new UserDatabaseMetadataService(metadataBackend);
var jobCanceller = new JobCanceller(userDatabaseMetadataService);

var USER = 'vizzuality';
var QUERY = 'select pg_sleep(0)';
var HOST = 'localhost';
var JOB = {
    user: USER,
    query: QUERY,
    host: HOST
};

function createWadusDataJob() {
    return JSON.parse(JSON.stringify(JOB));
}

// sets job to running, run its query and returns inmediatly (don't wait for query finishes)
// in order to test query cancelation/draining
function runQueryHelper(job, callback) {
    var job_id = job.job_id;
    var user = job.user;
    var sql = job.query;

    job.status = jobStatus.RUNNING;

    jobBackend.update(job, function (err) {
        if (err) {
            return callback(err);
        }

        userDatabaseMetadataService.getUserMetadata(user, function (err, userDatabaseMetadata) {
            if (err) {
                return callback(err);
            }

            var pg = new PSQL(userDatabaseMetadata, {}, { destroyOnError: true });

            sql = '/* ' + job_id + ' */ ' + sql;

            pg.eventedQuery(sql, function (err, query) {
                if (err) {
                    return callback(err);
                }

                callback(null, query);
            });
        });
    });
}

describe('job service', function() {
    var jobService = new JobService(jobBackend, jobCanceller);

    after(function (done) {
        redisUtils.clean('batch:*', done);
    });

    it('.get() should return a job', function (done) {
        jobService.create(createWadusDataJob(), function (err, jobCreated) {
            if (err) {
                return done(err);
            }

            jobService.get(jobCreated.data.job_id, function (err, job) {
                if (err) {
                    return done(err);
                }

                assert.equal(job.data.job_id, jobCreated.data.job_id);
                done();
            });
        });
    });

    it('.get() should return a not found error', function (done) {
        jobService.get('wadus_job_id', function (err) {
            assert.ok(err);
            assert.equal(err.message, 'Job with id wadus_job_id not found');
            done();
        });
    });

    it('.create() should persist a job', function (done) {
        jobService.create(createWadusDataJob(), function (err, jobCreated) {
            if (err) {
                return done(err);
            }

            assert.ok(jobCreated.data.job_id);
            assert.equal(jobCreated.data.status, jobStatus.PENDING);
            done();
        });
    });

    it('.create() should return error with invalid job data', function (done) {
        var job = createWadusDataJob();

        delete job.query;

        jobService.create(job, function (err) {
            assert.ok(err);
            assert.equal(err.message, 'You must indicate a valid SQL');
            done();
        });
    });

    it('.list() should return a list of user\'s jobs', function (done) {
        jobService.create(createWadusDataJob(), function (err, jobCreated) {
            if (err) {
                return done(err);
            }

            jobService.list(USER, function (err, jobs) {
                var found = false;

                assert.ok(!err, err);
                assert.ok(jobs.length);

                jobs.forEach(function (job) {
                    if (job.data.job_id === jobCreated.data.job_id) {
                        found = true;
                    }
                });

                assert.ok(found, 'Job expeted to be listed not found');
                done();
            });
        });
    });

    it('.list() should return a empty list for nonexitent user', function (done) {
        jobService.list('wadus_user', function (err, jobs) {
            assert.ok(!err, err);
            assert.ok(!jobs.length);
            done();
        });
    });

    it('.update() should update a job', function (done) {
        jobService.create(createWadusDataJob(), function (err, jobCreated) {
            if (err) {
                return done(err);
            }

            jobCreated.data.query = 'select pg_sleep(1)';

            jobService.update(jobCreated.data, function (err, jobUpdated) {
                if (err) {
                    return done(err);
                }

                assert.equal(jobUpdated.data.job_id, jobCreated.data.job_id);
                assert.equal(jobUpdated.data.query, 'select pg_sleep(1)');
                done();
            });
        });
    });

    it('.update() should return error when updates a nonexistent job', function (done) {
        var job = createWadusDataJob();

        job.job_id = 'wadus_job_id';

        jobService.update(job, function (err) {
            assert.ok(err, err);
            assert.equal(err.name, 'NotFoundError');
            assert.equal(err.message, 'Job with id ' + job.job_id + ' not found');
            done();
        });
    });

    it('.cancel() should cancel a running job', function (done) {
        var job = createWadusDataJob();
        job.query = 'select pg_sleep(3)';

        jobService.create(job, function (err, job) {
            if (err) {
                return done(err);
            }

            runQueryHelper(job.data, function (err) {
                if (err) {
                    return done(err);
                }

                jobService.cancel(job.data.job_id, function (err, jobCancelled) {
                    if (err) {
                        return done(err);
                    }

                    assert.equal(jobCancelled.data.job_id, job.data.job_id);
                    assert.equal(jobCancelled.data.status, jobStatus.CANCELLED);
                    done();
                });
            });
        });
    });

    it('.cancel() should return a job not found error', function (done) {
        jobService.cancel('wadus_job_id', function (err) {
            assert.ok(err, err);
            assert.equal(err.name, 'NotFoundError');
            assert.equal(err.message, 'Job with id wadus_job_id not found');
            done();
        });
    });

    it('.drain() should draing a running job', function (done) {
        var job = createWadusDataJob();
        job.query = 'select pg_sleep(3)';

        jobService.create(job, function (err, job) {
            if (err) {
                return done(err);
            }

            runQueryHelper(job.data, function (err) {
                if (err) {
                    return done(err);
                }

                jobService.drain(job.data.job_id, function (err, jobDrained) {
                    if (err) {
                        return done(err);
                    }

                    assert.equal(jobDrained.job_id, job.data.job_id);
                    assert.equal(jobDrained.status, jobStatus.PENDING);
                    done();
                });
            });
        });
    });

    it('.drain() should return a job not found error', function (done) {
        jobService.drain('wadus_job_id', function (err) {
            assert.ok(err, err);
            assert.equal(err.name, 'NotFoundError');
            assert.equal(err.message, 'Job with id wadus_job_id not found');
            done();
        });
    });

});