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module trial.reporters.stats;

import std.algorithm;
import std.string;
import std.conv;
import std.exception;
import std.array;
import std.datetime;
import std.stdio;
import std.file;
import std.path;

import trial.runner;
import trial.interfaces;


struct Stat
{

  string name;

  SysTime begin;

  SysTime end;

  TestResult.Status status = TestResult.Status.unknown;

  SourceLocation location;
}


class StatStorage
{

  Stat[] values;
}

Stat find(StatStorage storage, const(string) name)
{
  auto res = storage.values.filter!(a => a.name == name);

  if (res.empty)
  {
    return Stat("", SysTime.min, SysTime.min);
  }

  return res.front;
}



class StatsReporter : ILifecycleListener, ITestCaseLifecycleListener,
  ISuiteLifecycleListener, IStepLifecycleListener
{
  private
  {
    immutable string destination;
    StatStorage storage;
    string[][string] path;
  }

  this(StatStorage storage, string destination)
  {
    this.storage = storage;
    this.destination = destination;
  }

  this(string destination)
  {
    this(new StatStorage, destination);
  }

  private
  {
    auto lastItem(string key)
    {
      enforce(path[key].length > 0, "There is no defined path");
      return path[key][path.length - 1];
    }
  }

  void update()
  {
  }

  void begin(ref SuiteResult suite)
  {
  }

  void end(ref SuiteResult suite)
  {
    storage.values ~= Stat(suite.name, suite.begin, Clock.currTime);
  }

  void begin(string suite, ref TestResult test)
  {
  }

  void end(string suite, ref TestResult test)
  {
    storage.values ~= Stat(suite ~ "." ~ test.name, test.begin, Clock.currTime, test.status, SourceLocation(test.fileName, test.line));
  }

  void begin(string suite, string test, ref StepResult step)
  {
    string key = suite ~ "." ~ test;
    path[key] ~= step.name;
  }

  void end(string suite, string test, ref StepResult step)
  {
    string key = suite ~ "." ~ test;

    enforce(lastItem(key) == step.name, "Invalid step name");
    storage.values ~= Stat(key ~ "." ~ path[key].join('.'), step.begin, Clock.currTime);
    path[key] = path[key][0 .. $ - 1];
  }

  void begin(ulong)
  {
  }

  void end(SuiteResult[])
  {
    auto parent = buildPath(pathSplitter(destination).array[0..$-1]);

    if(parent != "" && !parent.exists) {
      mkdirRecurse(parent);
    }

    std.file.write(destination, storage.toCsv);

    auto attachment = const Attachment("stats", destination, "text/csv");

    if(LifeCycleListeners.instance !is null) {
      LifeCycleListeners.instance.attach(attachment);
    }
  }
}


string toCsv(const(StatStorage) storage)
{
  return storage.values.map!(a => [a.name, a.begin.toISOExtString,
      a.end.toISOExtString, a.status.to!string, a.location.fileName, a.location.line.to!string]).map!(a => a.join(',')).join('\n');
}

StatStorage toStatStorage(const(string) data)
{
  auto stat = new StatStorage;

  stat.values = data
    .split('\n')
    .map!(a => a.split(','))
    .filter!(a => a.length == 6)
    .map!(a =>
      Stat(a[0],
      SysTime.fromISOExtString(a[1]),
      SysTime.fromISOExtString(a[2]),
      a[3].to!(TestResult.Status),
      SourceLocation(a[4], a[5].to!size_t)))
    .array;

  return stat;
}

StatStorage statsFromFile(string fileName)
{
  if (!fileName.exists)
  {
    return new StatStorage();
  }

  return fileName.readText.toStatStorage;
}