/* global print */
'use strict';

// //////////////////////////////////////////////////////////////////////////////
// / @brief ArangoDB Mocha integration
// /
// / @file
// /
// / DISCLAIMER
// /
// / Copyright 2016 triAGENS GmbH, Cologne, Germany
// /
// / Licensed under the Apache License, Version 2.0 (the "License")
// / you may not use this file except in compliance with the License.
// / You may obtain a copy of the License at
// /
// /     http://www.apache.org/licenses/LICENSE-2.0
// /
// / Unless required by applicable law or agreed to in writing, software
// / distributed under the License is distributed on an "AS IS" BASIS,
// / WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// / See the License for the specific language governing permissions and
// / limitations under the License.
// /
// / Copyright holder is triAGENS GmbH, Cologne, Germany
// /
// / @author Alan Plum
// / @author Copyright 2016, triAGENS GmbH, Cologne, Germany
// //////////////////////////////////////////////////////////////////////////////

const Module = require('module');
const chalk = require('chalk');
const runTests = require('@arangodb/mocha').run;
const indent = require('@arangodb/util').indentation;

const $_MODULE_CONTEXT = Symbol.for('@arangodb/module.context');

module.exports = function (files, returnJson, grep) {
  const results = runTests(run, files, 'suite', grep);
  print();
  logSuite(results);
  logStats(results.stats);
  print();
  if (returnJson) {
    return buildJson(results);
  }
  return results.stats.failures === 0;
};

function logStats (stats) {
  print(`${
    stats.failures
    ? chalk.red('[FAIL]')
    : chalk.green('[PASS]')
  } Completed ${
    chalk.bold(stats.tests)
  } tests in ${
    chalk.bold(stats.duration + 'ms')
  } (${
    chalk.green(stats.passes)
  }|${
    chalk.red(stats.failures)
  }|${
    chalk.cyan(stats.pending)
  })`);
}

function logSuite (suite, indentLevel) {
  if (!indentLevel) {
    indentLevel = 0;
  }
  if (suite.title) {
    print(
      indent(indentLevel - 1) +
      chalk.bold(suite.title)
    );
  }
  for (let test of suite.tests) {
    if (test.result === 'pass') {
      print(
        indent(indentLevel) +
        chalk.green('[PASS] ' + test.title)
      );
    } else if (test.result === 'pending') {
      print(
        indent(indentLevel) +
        chalk.cyan('[SKIP] ' + test.title)
      );
    } else {
      print(
        indent(indentLevel) +
        chalk.red('[' + test.result.toUpperCase() + '] ' + test.title)
      );
      for (let line of test.err.stack.split(/\n/)) {
        print(
          indent(indentLevel + 1) +
          chalk.red(line)
        );
      }
    }
  }
  for (let sub of suite.suites) {
    logSuite(sub, indentLevel + 1);
  }
  if (suite.suites.length) {
    print();
  }
}

function buildJson (results) {
  const result = {
    duration: results.stats.duration,
    status: !results.stats.failures,
    failed: results.stats.failures,
    total: results.stats.tests,
    totalSetUp: 0, // we can't get setup time spent in mocha
    totalTearDown: 0
  };
  for (const test of findTests(results)) {
    const name = test[0];
    const stats = test[1];
    let newName = name;
    let i = 1;
    while (result.hasOwnProperty(newName)) {
      newName = `${name} ${i++}`;
    }
    result[newName] = {
      status: stats.result === 'pass' || stats.result === 'pending',
      duration: stats.duration
    };
    if (stats.result !== 'pass' && stats.result !== 'pending') {
      result[newName].message = stats.err.stack;
    }
  }
  return result;
}

function findTests (suite, prefix) {
  prefix = prefix ? prefix + ' ' : '';
  const results = [];
  for (const test of suite.tests) {
    results.push([prefix + test.title, test]);
  }
  for (const sub of suite.suites) {
    for (const res of findTests(sub, prefix + sub.title)) {
      results.push(res);
    }
  }
  return results;
}

function run (filename, context) {
  const module = new Module(filename);

  if (context) {
    Object.keys(context).forEach(function (key) {
      module[$_MODULE_CONTEXT][key] = context[key];
    });
  }

  module.load(filename);
  return module.exports;
}