import {
  pipe,
}  from './taskHelper';
import mongoose                   from 'mongoose';
import { exec }                   from 'child_process';
import gulp                       from 'gulp';
import os                         from 'os';
import nconf                      from 'nconf';

// TODO rewrite

const TEST_SERVER_PORT  = 3003;
let server;

const TEST_DB_URI       = nconf.get('TEST_DB_URI');

const SANITY_TEST_COMMAND = 'npm run test:sanity';
const COMMON_TEST_COMMAND = 'npm run test:common';
const CONTENT_TEST_COMMAND = 'npm run test:content';
const CONTENT_OPTIONS = {maxBuffer: 1024 * 500};

/* Helper methods for reporting test summary */
let testResults = [];
let testCount = (stdout, regexp) => {
  let match = stdout.match(regexp);
  return parseInt(match && match[1] || 0, 10);
};

let testBin = (string, additionalEnvVariables = '') => {
  if (os.platform() === 'win32') {
    if (additionalEnvVariables !== '') {
      additionalEnvVariables = additionalEnvVariables.split(' ').join('&&set ');
      additionalEnvVariables = `set ${additionalEnvVariables}&&`;
    }
    return `set NODE_ENV=test&&${additionalEnvVariables}${string}`;
  } else {
    return `NODE_ENV=test ${additionalEnvVariables} ${string}`;
  }
};

gulp.task('test:nodemon', gulp.series(function setupNodemon (done) {
  process.env.PORT = TEST_SERVER_PORT; // eslint-disable-line no-process-env
  process.env.NODE_DB_URI = TEST_DB_URI; // eslint-disable-line no-process-env
  done();
}, 'nodemon'));

gulp.task('test:prepare:mongo', (cb) => {
  mongoose.connect(TEST_DB_URI, (err) => {
    if (err) return cb(`Unable to connect to mongo database. Are you sure it's running? \n\n${err}`);
    mongoose.connection.dropDatabase((err2) => {
      if (err2) return cb(err2);
      mongoose.connection.close(cb);
    });
  });
});

gulp.task('test:prepare:server', gulp.series('test:prepare:mongo', (done) => {
  if (!server) {
    server = exec(testBin('node ./website/server/index.js', `NODE_DB_URI=${TEST_DB_URI} PORT=${TEST_SERVER_PORT}`), (error, stdout, stderr) => {
      if (error) {
        throw new Error(`Problem with the server: ${error}`);
      }
      if (stderr) {
        console.error(stderr); // eslint-disable-line no-console
      }
      done();
    });
  }
}));

gulp.task('test:prepare:build', gulp.series('build', done => done()));

gulp.task('test:prepare', gulp.series(
  'test:prepare:build',
  'test:prepare:mongo',
  done => done()
));

gulp.task('test:sanity', (cb) => {
  let runner = exec(
    testBin(SANITY_TEST_COMMAND),
    (err) => {
      if (err) {
        process.exit(1);
      }
      cb();
    }
  );
  pipe(runner);
});

gulp.task('test:common', gulp.series('test:prepare:build', (cb) => {
  let runner = exec(
    testBin(COMMON_TEST_COMMAND),
    (err) => {
      if (err) {
        process.exit(1);
      }
      cb();
    }
  );
  pipe(runner);
}));

gulp.task('test:common:clean', (cb) => {
  pipe(exec(testBin(COMMON_TEST_COMMAND), () => cb()));
});

gulp.task('test:common:watch', gulp.series('test:common:clean', () => {
  return gulp.watch(['common/script/**/*', 'test/common/**/*'], gulp.series('test:common:clean', done => done()));
}));

gulp.task('test:common:safe', gulp.series('test:prepare:build', (cb) => {
  let runner = exec(
    testBin(COMMON_TEST_COMMAND),
    (err, stdout) => { // eslint-disable-line handle-callback-err
      testResults.push({
        suite: 'Common Specs\t',
        pass: testCount(stdout, /(\d+) passing/),
        fail: testCount(stdout, /(\d+) failing/),
        pend: testCount(stdout, /(\d+) pending/),
      });
      cb();
    }
  );
  pipe(runner);
}));

gulp.task('test:content', gulp.series('test:prepare:build', (cb) => {
  let runner = exec(
    testBin(CONTENT_TEST_COMMAND),
    CONTENT_OPTIONS,
    (err) => {
      if (err) {
        process.exit(1);
      }
      cb();
    }
  );
  pipe(runner);
}));

gulp.task('test:content:clean', (cb) => {
  pipe(exec(testBin(CONTENT_TEST_COMMAND), CONTENT_OPTIONS, () => cb()));
});

gulp.task('test:content:watch', gulp.series('test:content:clean', () => {
  return gulp.watch(['common/script/content/**', 'test/**'], gulp.series('test:content:clean', done => done()));
}));

gulp.task('test:content:safe', gulp.series('test:prepare:build', (cb) => {
  let runner = exec(
    testBin(CONTENT_TEST_COMMAND),
    CONTENT_OPTIONS,
    (err, stdout) => {  // eslint-disable-line handle-callback-err
      testResults.push({
        suite: 'Content Specs\t',
        pass: testCount(stdout, /(\d+) passing/),
        fail: testCount(stdout, /(\d+) failing/),
        pend: testCount(stdout, /(\d+) pending/),
      });
      cb();
    }
  );
  pipe(runner);
}));

gulp.task('test:api:unit', (done) => {
  let runner = exec(
    testBin('node_modules/.bin/istanbul cover --dir coverage/api-unit node_modules/mocha/bin/_mocha -- test/api/unit --recursive --require ./test/helpers/start-server'),
    (err) => {
      if (err) {
        process.exit(1);
      }
      done();
    }
  );

  pipe(runner);
});

gulp.task('test:api:unit:watch', () => {
  return gulp.watch(['website/server/libs/*', 'test/api/unit/**/*', 'website/server/controllers/**/*'], gulp.series('test:api:unit', done => done()));
});

gulp.task('test:api-v3:integration', (done) => {
  let runner = exec(
    testBin('node_modules/.bin/istanbul cover --dir coverage/api-v3-integration --report lcovonly node_modules/mocha/bin/_mocha -- test/api/v3/integration --recursive --require ./test/helpers/start-server'),
    {maxBuffer: 500 * 1024},
    (err) => {
      if (err) {
        process.exit(1);
      }
      done();
    }
  );

  pipe(runner);
});

gulp.task('test:api-v3:integration:watch', () => {
  return gulp.watch([
    'website/server/controllers/api-v3/**/*', 'common/script/ops/*', 'website/server/libs/*.js',
    'test/api/v3/integration/**/*',
  ], gulp.series('test:api-v3:integration', done => done()));
});

gulp.task('test:api-v3:integration:separate-server', (done) => {
  let runner = exec(
    testBin('mocha test/api/v3/integration --recursive --require ./test/helpers/start-server', 'LOAD_SERVER=0'),
    {maxBuffer: 500 * 1024},
    (err) => done(err)
  );

  pipe(runner);
});

gulp.task('test:api-v4:integration', (done) => {
  let runner = exec(
    testBin('node_modules/.bin/istanbul cover --dir coverage/api-v4-integration --report lcovonly node_modules/mocha/bin/_mocha -- test/api/v4 --recursive --require ./test/helpers/start-server'),
    {maxBuffer: 500 * 1024},
    (err) => {
      if (err) {
        process.exit(1);
      }
      done();
    }
  );

  pipe(runner);
});

gulp.task('test:api-v4:integration:separate-server', (done) => {
  let runner = exec(
    testBin('mocha test/api/v4 --recursive --require ./test/helpers/start-server', 'LOAD_SERVER=0'),
    {maxBuffer: 500 * 1024},
    (err) => done(err)
  );

  pipe(runner);
});

gulp.task('test', gulp.series(
  'test:sanity',
  'test:content',
  'test:common',
  'test:api:unit',
  'test:api-v3:integration',
  'test:api-v4:integration',
  done => done()
));

gulp.task('test:api-v3', gulp.series(
  'test:api:unit',
  'test:api-v3:integration',
  done => done()
));