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      /++
  A module containing the process runner

  Copyright: © 2018 Szabo Bogdan
  License: Subject to the terms of the MIT license, as written in the included LICENSE.txt file.
  Authors: Szabo Bogdan
+/
module trial.executor.process;

import trial.reporters.visualtrial;
import trial.executor.single;
public import trial.interfaces;

import std.process;
import std.path;
import std.file;
import std.datetime;
import std.conv;
import std.stdio;

void testProcessRuner(string suiteName, string testName, VisualTrialReporterParser parser) {
  TestResult testResult;

  auto command = [ thisExePath,
    "-s", suiteName,
    "-t", testName,
    "-r", "visualtrial",
    "-e", "default" ];

  auto pipes = pipeProcess(command, Redirect.stdout | Redirect.stderrToStdout);

  foreach(line; pipes.stdout.byLine) {
    parser.add(line.to!string);

    if(testResult is null && parser.testResult !is null) {
      testResult = parser.testResult;
    }
  }

  auto code = wait(pipes.pid);

  if(testResult !is null && testResult.throwable is null && code != 0) {
    testResult.throwable = new Exception("The process exited with code `" ~ code.to!string ~ "`", testResult.fileName, testResult.line);
    testResult.status = TestResult.Status.failure;
  }
}

/// An executor that will run every test in a separate
/// process
class ProcessExecutor : DefaultExecutor {
  alias runTest = DefaultExecutor.runTest;

  /// A function that should spawn a process that will run the test
  alias TestProcessRun = void function(string suiteName, string testName, VisualTrialReporterParser parser);

  private {
    TestProcessRun testProcessRun;
    VisualTrialReporterParser parser;
  }

  /// Instantiate the executor with a custom process runner
  this(TestProcessRun testProcessRun) {
    super();

    this.parser = new VisualTrialReporterParser();
    this.parser.onOutput = &this.onOutput;
    this.testProcessRun = testProcessRun;
  }

  /// Instantiate the executor with a custom process runner
  this() {
    this(&testProcessRuner);
  }

  void onOutput(string line) {
    writeln(line);
  }

  /// Run a test case
  override
  void runTest(ref const(TestCase) testCase, TestResult testResult) {
    this.parser.testResult = testResult;
    testProcessRun(testCase.suiteName, testCase.name, parser);
  }
}