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module trial.reporters.visualtrial;

import std.conv;
import std.string;
import std.algorithm;
import std.stdio;
import std.datetime;
import std.exception;

version(Have_fluent_asserts) {
  import fluentasserts.core.base;
  import fluentasserts.core.results;
}

import trial.interfaces;
import trial.reporters.writer;

enum Tokens : string {
  beginTest = "BEGIN TEST;",
  endTest = "END TEST;",
  suite = "suite",
  test = "test",
  file = "file",
  line = "line",
  labels = "labels",
  status = "status",
  errorFile = "errorFile",
  errorLine = "errorLine",
  message = "message"
}


class VisualTrialReporter : ILifecycleListener, ITestCaseLifecycleListener
{
  private {
    ReportWriter writer;
  }


  this()
  {
    writer = defaultWriter;
  }


  this(ReportWriter writer)
  {
    this.writer = writer;
  }


  void begin(ulong testCount) {
    writer.writeln("", ReportWriter.Context._default);
    writer.writeln("", ReportWriter.Context._default);
  }


  void update() { }


  void end(SuiteResult[]) { }


  void begin(string suite, ref TestResult result)
  {
    std.stdio.stdout.flush;
    std.stdio.stderr.flush;
    writer.writeln("BEGIN TEST;", ReportWriter.Context._default);
    writer.writeln("suite:" ~ suite, ReportWriter.Context._default);
    writer.writeln("test:" ~ result.name, ReportWriter.Context._default);
    writer.writeln("file:" ~ result.fileName, ReportWriter.Context._default);
    writer.writeln("line:" ~ result.line.to!string, ReportWriter.Context._default);
    writer.writeln("labels:[" ~ result.labels.map!(a => a.toString).join(", ") ~ "]", ReportWriter.Context._default);
    std.stdio.stdout.flush;
    std.stdio.stderr.flush;
  }


  void end(string suite, ref TestResult test)
  {
    std.stdio.stdout.flush;
    std.stdio.stderr.flush;
    writer.writeln("status:" ~ test.status.to!string, ReportWriter.Context._default);

    if(test.status != TestResult.Status.success) {
      if(test.throwable !is null) {
        writer.writeln("errorFile:" ~ test.throwable.file, ReportWriter.Context._default);
        writer.writeln("errorLine:" ~ test.throwable.line.to!string, ReportWriter.Context._default);
        writer.writeln("message:" ~ test.throwable.msg.split("\n")[0], ReportWriter.Context._default);
        writer.write("error:", ReportWriter.Context._default);
        writer.writeln(test.throwable.toString, ReportWriter.Context._default);
      }
    }

    writer.writeln("END TEST;", ReportWriter.Context._default);

    std.stdio.stdout.flush;
    std.stdio.stderr.flush;
  }
}








class VisualTrialReporterParser {
  TestResult testResult;
  string suite;
  bool readingTest;

  alias ResultEvent = void delegate(TestResult);
  alias OutputEvent = void delegate(string);

  ResultEvent onResult;
  OutputEvent onOutput;

  private {
    bool readingErrorMessage;
  }


  void add(string line) {
    if(line == Tokens.beginTest) {
      if(testResult is null) {
        testResult = new TestResult("unknown");
      }
      readingTest = true;
      testResult.begin = Clock.currTime;
      testResult.end = Clock.currTime;
      return;
    }

    if(line == Tokens.endTest) {
      enforce(testResult !is null, "The test result was not created!");
      readingTest = false;
      if(onResult !is null) {
        onResult(testResult);
      }

      readingErrorMessage = false;
      testResult = null;
      return;
    }

    if(!readingTest) {
      return;
    }

    if(readingErrorMessage) {
      testResult.throwable.msg ~= "\n" ~ line;
      return;
    }

    auto pos = line.indexOf(":");

    if(pos == -1) {
      if(onOutput !is null) {
        onOutput(line);
      }

      return;
    }

    string token = line[0 .. pos];
    string value = line[pos+1 .. $];

    switch(token) {
      case Tokens.suite:
        suite = value;
        break;

      case Tokens.test:
        testResult.name = value;
        break;

      case Tokens.file:
        testResult.fileName = value;
        break;

      case Tokens.line:
        testResult.line = value.to!size_t;
        break;

      case Tokens.labels:
        testResult.labels = Label.fromJsonArray(value);
        break;

      case Tokens.status:
        testResult.status = value.to!(TestResult.Status);
        break;

      case Tokens.errorFile:
        if(testResult.throwable is null) {
          testResult.throwable = new ParsedVisualTrialException();
        }
        testResult.throwable.file = value;

        break;

      case Tokens.errorLine:
        if(testResult.throwable is null) {
          testResult.throwable = new ParsedVisualTrialException();
        }
        testResult.throwable.line = value.to!size_t;
        break;

      case Tokens.message:
        enforce(testResult.throwable !is null, "The throwable must exist!");
        testResult.throwable.msg = value;
        readingErrorMessage = true;
        break;

      default:
        if(onOutput !is null) {
          onOutput(line);
        }
    }
  }
}






class ParsedVisualTrialException : Exception {
  this() {
    super("");
  }
}