/**
 * Copyright (c) Microsoft Corporation.
 *
 * 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.
 */

import { codeFrameColumns } from '@babel/code-frame';
import colors from 'colors/safe';
import fs from 'fs';
// @ts-ignore
import milliseconds from 'ms';
import path from 'path';
import StackUtils from 'stack-utils';
import { FullConfig, TestStatus, Test, Suite, TestResult, TestError, Reporter, FullResult } from '../reporter';

const stackUtils = new StackUtils();

export class BaseReporter implements Reporter  {
  duration = 0;
  config!: FullConfig;
  suite!: Suite;
  result!: FullResult;
  fileDurations = new Map<string, number>();
  monotonicStartTime: number = 0;

  onBegin(config: FullConfig, suite: Suite) {
    this.monotonicStartTime = monotonicTime();
    this.config = config;
    this.suite = suite;
  }

  onStdOut(chunk: string | Buffer) {
    if (!this.config.quiet)
      process.stdout.write(chunk);
  }

  onStdErr(chunk: string | Buffer) {
    if (!this.config.quiet)
      process.stderr.write(chunk);
  }

  onTestEnd(test: Test, result: TestResult) {
    const relativePath = relativeTestPath(this.config, test);
    const fileAndProject = relativePath + (test.projectName ? ` [${test.projectName}]` : '');
    const duration = this.fileDurations.get(fileAndProject) || 0;
    this.fileDurations.set(fileAndProject, duration + result.duration);
  }

  onError(error: TestError) {
    console.log(formatError(error));
  }

  async onEnd(result: FullResult) {
    this.duration = monotonicTime() - this.monotonicStartTime;
    this.result = result;
  }

  private _printSlowTests() {
    if (!this.config.reportSlowTests)
      return;
    const fileDurations = [...this.fileDurations.entries()];
    fileDurations.sort((a, b) => b[1] - a[1]);
    const count = Math.min(fileDurations.length, this.config.reportSlowTests.max || Number.POSITIVE_INFINITY);
    for (let i = 0; i < count; ++i) {
      const duration = fileDurations[i][1];
      if (duration <= this.config.reportSlowTests.threshold)
        break;
      console.log(colors.yellow('  Slow test: ') + fileDurations[i][0] + colors.yellow(` (${milliseconds(duration)})`));
    }
  }

  epilogue(full: boolean) {
    let skipped = 0;
    let expected = 0;
    const unexpected: Test[] = [];
    const flaky: Test[] = [];

    this.suite.allTests().forEach(test => {
      switch (test.status()) {
        case 'skipped': ++skipped; break;
        case 'expected': ++expected; break;
        case 'unexpected': unexpected.push(test); break;
        case 'flaky': flaky.push(test); break;
      }
    });

    if (full && unexpected.length) {
      console.log('');
      this._printFailures(unexpected);
    }

    this._printSlowTests();

    console.log('');
    if (unexpected.length) {
      console.log(colors.red(`  ${unexpected.length} failed`));
      this._printTestHeaders(unexpected);
    }
    if (flaky.length) {
      console.log(colors.red(`  ${flaky.length} flaky`));
      this._printTestHeaders(flaky);
    }
    if (skipped)
      console.log(colors.yellow(`  ${skipped} skipped`));
    if (expected)
      console.log(colors.green(`  ${expected} passed`) + colors.dim(` (${milliseconds(this.duration)})`));
    if (this.result.status === 'timedout')
      console.log(colors.red(`  Timed out waiting ${this.config.globalTimeout / 1000}s for the entire test run`));
  }

  private _printTestHeaders(tests: Test[]) {
    tests.forEach(test => {
      console.log(formatTestHeader(this.config, test, '    '));
    });
  }

  private _printFailures(failures: Test[]) {
    failures.forEach((test, index) => {
      console.log(formatFailure(this.config, test, index + 1));
    });
  }

  hasResultWithStatus(test: Test, status: TestStatus): boolean {
    return !!test.results.find(r => r.status === status);
  }

  willRetry(test: Test, result: TestResult): boolean {
    return result.status !== 'passed' && result.status !== test.expectedStatus && test.results.length <= test.retries;
  }
}

export function formatFailure(config: FullConfig, test: Test, index?: number): string {
  const tokens: string[] = [];
  tokens.push(formatTestHeader(config, test, '  ', index));
  for (const result of test.results) {
    if (result.status === 'passed')
      continue;
    tokens.push(formatFailedResult(test, result));
  }
  tokens.push('');
  return tokens.join('\n');
}

function relativeTestPath(config: FullConfig, test: Test): string {
  return path.relative(config.rootDir, test.location.file) || path.basename(test.location.file);
}

export function formatTestTitle(config: FullConfig, test: Test): string {
  let relativePath = relativeTestPath(config, test);
  relativePath += ':' + test.location.line + ':' + test.location.column;
  const title = (test.projectName ? `[${test.projectName}] ` : '') + test.fullTitle();
  return `${relativePath} › ${title}`;
}

function formatTestHeader(config: FullConfig, test: Test, indent: string, index?: number): string {
  const title = formatTestTitle(config, test);
  const passedUnexpectedlySuffix = test.results[0].status === 'passed' ? ' -- passed unexpectedly' : '';
  const header = `${indent}${index ? index + ') ' : ''}${title}${passedUnexpectedlySuffix}`;
  return colors.red(pad(header, '='));
}

function formatFailedResult(test: Test, result: TestResult): string {
  const tokens: string[] = [];
  if (result.retry)
    tokens.push(colors.gray(pad(`\n    Retry #${result.retry}`, '-')));
  if (result.status === 'timedOut') {
    tokens.push('');
    tokens.push(indent(colors.red(`Timeout of ${test.timeout}ms exceeded.`), '    '));
    if (result.error !== undefined)
      tokens.push(indent(formatError(result.error, test.location.file), '    '));
  } else {
    tokens.push(indent(formatError(result.error!, test.location.file), '    '));
  }
  return tokens.join('\n');
}

function formatError(error: TestError, file?: string) {
  const stack = error.stack;
  const tokens = [];
  if (stack) {
    tokens.push('');
    const message = error.message || '';
    const messageLocation = stack.indexOf(message);
    const preamble = stack.substring(0, messageLocation + message.length);
    tokens.push(preamble);
    const position = file ? positionInFile(stack, file) : null;
    if (position) {
      const source = fs.readFileSync(file!, 'utf8');
      tokens.push('');
      tokens.push(codeFrameColumns(source, {
        start: position,
      },
      { highlightCode: colors.enabled }
      ));
    }
    tokens.push('');
    tokens.push(colors.dim(preamble.length > 0 ? stack.substring(preamble.length + 1) : stack));
  } else {
    tokens.push('');
    tokens.push(error.value);
  }
  return tokens.join('\n');
}

function pad(line: string, char: string): string {
  return line + ' ' + colors.gray(char.repeat(Math.max(0, 100 - line.length - 1)));
}

function indent(lines: string, tab: string) {
  return lines.replace(/^(?=.+$)/gm, tab);
}

function positionInFile(stack: string, file: string): { column: number; line: number; } | undefined {
  // Stack will have /private/var/folders instead of /var/folders on Mac.
  file = fs.realpathSync(file);
  for (const line of stack.split('\n')) {
    const parsed = stackUtils.parseLine(line);
    if (!parsed || !parsed.file)
      continue;
    if (path.resolve(process.cwd(), parsed.file) === file)
      return {column: parsed.column || 0, line: parsed.line || 0};
  }
}

function monotonicTime(): number {
  const [seconds, nanoseconds] = process.hrtime();
  return seconds * 1000 + (nanoseconds / 1000000 | 0);
}

const asciiRegex = new RegExp('[\\u001B\\u009B][[\\]()#;?]*(?:(?:(?:[a-zA-Z\\d]*(?:;[-a-zA-Z\\d\\/#&.:=?%@~_]*)*)?\\u0007)|(?:(?:\\d{1,4}(?:;\\d{0,4})*)?[\\dA-PR-TZcf-ntqry=><~]))', 'g');
export function stripAscii(str: string): string {
  return str.replace(asciiRegex, '');
}