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module trial.reporters.writer;

import std.stdio;
import std.algorithm;
import std.string;



ReportWriter defaultWriter;


interface ReportWriter
{



  enum Context
  {

    active,


    inactive,


    success,


    info,


    warning,


    danger,


    _default
  }


  void goTo(int);


  void write(string, Context = Context.active);


  void writeReverse(string, Context = Context.active);


  void writeln(string, Context = Context.active);


  void showCursor();


  void hideCursor();


  uint width();
}




class ConsoleWriter : ReportWriter
{


  void goTo(int)
  {
  }


  void write(string text, Context)
  {
    std.stdio.write(text);
  }


  void writeReverse(string text, Context)
  {
    std.stdio.write(text);
  }


  void writeln(string text, Context)
  {
    std.stdio.writeln(text);
  }


  void showCursor()
  {
  }


  void hideCursor()
  {
  }


  uint width()
  {
    return 80;
  }
}

import trial.terminal;

shared static this()
{
  version(Windows)
  {
    import core.sys.windows.windows;

    SetConsoleCP(65001);
    SetConsoleOutputCP(65001);

    auto consoleType = GetFileType(GetStdHandle(STD_OUTPUT_HANDLE));

    if(consoleType == 2) {
      writeln("using the color console.");
      defaultWriter = new ColorConsoleWriter;
    } else {
      writeln("using the standard console.");
      defaultWriter = new ConsoleWriter;
    }
    std.stdio.stdout.flush;
  } else {
    defaultWriter = new ColorConsoleWriter;
  }
}





class ColorConsoleWriter : ReportWriter
{
  private
  {
    int[string] cues;
    Terminal terminal;

    int lines = 0;
    bool movedToBottom = false;
    Context currentContext = Context._default;
    bool isReversed = false;
  }

  this()
  {
    this.terminal = Terminal(ConsoleOutputType.linear);
    this.terminal._suppressDestruction = true;

    lines = this.terminal.cursorY;
  }

  void setColor(Context context)
  {
    if (!isReversed && context == currentContext)
    {
      return;
    }

    isReversed = false;
    currentContext = context;

    switch (context)
    {
    case Context.active:
      terminal.color(Color.white | Bright, Color.DEFAULT);
      break;

    case Context.inactive:
      terminal.color(Color.black | Bright, Color.DEFAULT);
      break;

    case Context.success:
      terminal.color(Color.green | Bright, Color.DEFAULT);
      break;

    case Context.info:
      terminal.color(Color.cyan, Color.DEFAULT);
      break;

    case Context.warning:
      terminal.color(Color.yellow, Color.DEFAULT);
      break;

    case Context.danger:
      terminal.color(Color.red, Color.DEFAULT);
      break;

    default:
      terminal.reset();
    }
  }

  void setColorReverse(Context context)
  {
    if (!isReversed && context == currentContext)
    {
      return;
    }

    currentContext = context;
    isReversed = true;

    switch (context)
    {
    case Context.active:
      terminal.color(Color.DEFAULT, Color.white | Bright);
      break;

    case Context.inactive:
      terminal.color(Color.DEFAULT, Color.black | Bright);
      break;

    case Context.success:
      terminal.color(Color.DEFAULT, Color.green | Bright);
      break;

    case Context.info:
      terminal.color(Color.DEFAULT, Color.cyan);
      break;

    case Context.warning:
      terminal.color(Color.DEFAULT, Color.yellow);
      break;

    case Context.danger:
      terminal.color(Color.DEFAULT, Color.red);
      break;

    default:
      terminal.reset();
    }
  }

  void resetColor()
  {
    setColor(Context._default);
  }


  void goTo(int y)
  {
    if (!movedToBottom)
    {
      movedToBottom = true;
      terminal.moveTo(0, terminal.height - 1);
    }
    terminal.moveTo(0, terminal.cursorY - y, ForceOption.alwaysSend);
  }


  void write(string text, Context context)
  {
    lines += text.count!(a => a == '\n');

    setColor(context);

    terminal.write(text);
    terminal.flush;
    resetColor;
    terminal.flush;
  }


  void writeReverse(string text, Context context)
  {
    lines += text.count!(a => a == '\n');

    setColorReverse(context);

    terminal.write(text);
    resetColor;
    terminal.flush;
  }


  void writeln(string text, Context context)
  {
    this.write(text ~ "\n", context);
  }


  void showCursor()
  {
    terminal.showCursor;
  }


  void hideCursor()
  {
    terminal.hideCursor;
  }


  uint width()
  {
    return terminal.width;
  }
}




class BufferedWriter : ReportWriter
{


  string buffer = "";

  private
  {
    size_t line = 0;
    size_t charPos = 0;
    bool replace;

    string[] screen;
  }


  void goTo(int y)
  {
    line = line - y;
    charPos = 0;
  }


  uint width()
  {
    return 80;
  }


  void write(string text, Context)
  {
    auto lines = text.count!(a => a == '\n');
    auto pieces = buffer.split("\n");

    auto newLines = text.split("\n");

    for (auto i = line; i < line + newLines.length; i++)
    {
      if (i != line)
      {
        charPos = 0;
      }

      while (i >= screen.length)
      {
        screen ~= "";
      }

      auto newLine = newLines[i - line];

      if (charPos + newLine.length >= screen[i].length)
      {
        screen[i] = screen[i][0 .. charPos] ~ newLine;
      }
      else
      {
        screen[i] = screen[i][0 .. charPos] ~ newLine ~ screen[i][charPos + newLine.length .. $];
      }
      charPos = charPos + newLine.length;
    }

    buffer = screen.join("\n");
    screen = buffer.split("\n");
    line += lines;
  }


  void writeReverse(string text, Context c)
  {
    write(text, c);
  }


  void writeln(string text, Context c)
  {
    write(text ~ '\n', c);
  }


  void showCursor()
  {
  }


  void hideCursor()
  {
  }
}