// Copyright 2010 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include <cstring>
#include <memory>
#include <mutex>
#include <string>
#include <vector>
#include <wx/bitmap.h>
#include <wx/brush.h>
#include <wx/colour.h>
#include <wx/dcmemory.h>
#include <wx/font.h>
#include <wx/notebook.h>
#include <wx/pen.h>
#include <wx/statbmp.h>

#include "DolphinWX/InputConfigDiag.h"
#include "DolphinWX/WxUtils.h"

#include "InputCommon/ControllerEmu.h"
#include "InputCommon/ControllerInterface/ControllerInterface.h"
#include "InputCommon/ControllerInterface/Device.h"

struct ShapePosition
{
  double max;
  double diag;
  double box;
  double scale;

  double dz;
  double range;

  wxCoord offset;
};

// regular octagon
static void DrawOctagon(wxDC* dc, ShapePosition p)
{
  const int vertices = 8;
  double radius = p.max;

  wxPoint point[vertices];

  double angle = 2.0 * M_PI / vertices;

  for (int i = 0; i < vertices; i++)
  {
    double a = (angle * i);
    double x = radius * cos(a);
    double y = radius * sin(a);
    point[i].x = x;
    point[i].y = y;
  }

  dc->DrawPolygon(vertices, point, p.offset, p.offset);
}

// irregular dodecagon
static void DrawDodecagon(wxDC* dc, ShapePosition p)
{
  const int vertices = 12;

  wxPoint point[vertices];
  point[0].x = p.dz;
  point[0].y = p.max;
  point[1].x = p.diag;
  point[1].y = p.diag;
  point[2].x = p.max;
  point[2].y = p.dz;

  point[3].x = p.max;
  point[3].y = -p.dz;
  point[4].x = p.diag;
  point[4].y = -p.diag;
  point[5].x = p.dz;
  point[5].y = -p.max;

  point[6].x = -p.dz;
  point[6].y = -p.max;
  point[7].x = -p.diag;
  point[7].y = -p.diag;
  point[8].x = -p.max;
  point[8].y = -p.dz;

  point[9].x = -p.max;
  point[9].y = p.dz;
  point[10].x = -p.diag;
  point[10].y = p.diag;
  point[11].x = -p.dz;
  point[11].y = p.max;

  dc->DrawPolygon(vertices, point, p.offset, p.offset);
}

static void DrawCenteredRectangle(wxDC& dc, int x, int y, int w, int h)
{
  x -= w / 2;
  y -= h / 2;
  dc.DrawRectangle(x, y, w, h);
}

#define VIS_BITMAP_SIZE 64

#define VIS_NORMALIZE(a) ((a / 2.0) + 0.5)
#define VIS_COORD(a) ((VIS_NORMALIZE(a)) * VIS_BITMAP_SIZE)

#define COORD_VIS_SIZE 4

static void DrawCoordinate(wxDC& dc, ControlState x, ControlState y)
{
  int xc = VIS_COORD(x);
  int yc = VIS_COORD(y);
  DrawCenteredRectangle(dc, xc, yc, COORD_VIS_SIZE, COORD_VIS_SIZE);
}

static void DrawButton(unsigned int* const bitmasks, unsigned int buttons, unsigned int n, wxDC& dc,
                       ControlGroupBox* g, unsigned int row)
{
  if (buttons & bitmasks[(row * 8) + n])
  {
    dc.SetBrush(*wxRED_BRUSH);
  }
  else
  {
    unsigned char amt = 255 - g->control_group->controls[(row * 8) + n]->control_ref->State() * 128;
    dc.SetBrush(wxBrush(wxColour(amt, amt, amt)));
  }
  dc.DrawRectangle(n * 12, (row == 0) ? 0 : (row * 11), 14, 12);

  // text
  const std::string name = g->control_group->controls[(row * 8) + n]->name;
  // bit of hax so ZL, ZR show up as L, R
  dc.DrawText(StrToWxStr(std::string(1, (name[1] && name[1] < 'a') ? name[1] : name[0])),
              n * 12 + 2, 1 + ((row == 0) ? 0 : (row * 11)));
}

static void DrawControlGroupBox(wxDC& dc, ControlGroupBox* g)
{
  switch (g->control_group->type)
  {
  case GROUP_TYPE_TILT:
  case GROUP_TYPE_STICK:
  case GROUP_TYPE_CURSOR:
  {
    // this is starting to be a mess combining all these in one case

    ControlState x = 0, y = 0, z = 0;

    switch (g->control_group->type)
    {
    case GROUP_TYPE_STICK:
      ((ControllerEmu::AnalogStick*)g->control_group)->GetState(&x, &y);
      break;
    case GROUP_TYPE_TILT:
      ((ControllerEmu::Tilt*)g->control_group)->GetState(&x, &y);
      break;
    case GROUP_TYPE_CURSOR:
      ((ControllerEmu::Cursor*)g->control_group)->GetState(&x, &y, &z);
      break;
    }

    // ir cursor forward movement
    if (GROUP_TYPE_CURSOR == g->control_group->type)
    {
      if (z)
      {
        dc.SetPen(*wxRED_PEN);
        dc.SetBrush(*wxRED_BRUSH);
      }
      else
      {
        dc.SetPen(*wxGREY_PEN);
        dc.SetBrush(*wxGREY_BRUSH);
      }
      dc.DrawRectangle(0, 31 - z * 31, 64, 2);
    }

    // input zone
    dc.SetPen(*wxLIGHT_GREY_PEN);
    dc.SetBrush(*wxWHITE_BRUSH);
    if (GROUP_TYPE_STICK == g->control_group->type)
    {
      // outline and fill colors
      wxBrush LightGrayBrush("#dddddd");
      wxPen LightGrayPen("#bfbfbf");
      dc.SetBrush(LightGrayBrush);
      dc.SetPen(LightGrayPen);

      ShapePosition p;
      p.box = 64;
      p.offset = p.box / 2;
      p.range = 256;
      p.scale = p.box / p.range;
      p.dz = 15 * p.scale;
      bool octagon = false;

      if (g->control_group->name == "Main Stick")
      {
        p.max = 87 * p.scale;
        p.diag = 55 * p.scale;
      }
      else if (g->control_group->name == "C-Stick")
      {
        p.max = 74 * p.scale;
        p.diag = 46 * p.scale;
      }
      else
      {
        p.scale = 1;
        p.max = 32;
        octagon = true;
      }

      if (octagon)
        DrawOctagon(&dc, p);
      else
        DrawDodecagon(&dc, p);
    }
    else
    {
      dc.DrawRectangle(16, 16, 32, 32);
    }

    if (GROUP_TYPE_CURSOR != g->control_group->type)
    {
      // deadzone circle
      dc.SetBrush(*wxLIGHT_GREY_BRUSH);
      dc.DrawCircle(32, 32, g->control_group->settings[SETTING_DEADZONE]->value * 32);
    }

    // raw dot
    {
      ControlState xx, yy;
      xx = g->control_group->controls[3]->control_ref->State();
      xx -= g->control_group->controls[2]->control_ref->State();
      yy = g->control_group->controls[1]->control_ref->State();
      yy -= g->control_group->controls[0]->control_ref->State();

      dc.SetPen(*wxGREY_PEN);
      dc.SetBrush(*wxGREY_BRUSH);
      DrawCoordinate(dc, xx, yy);
    }

    // adjusted dot
    if (x != 0 || y != 0)
    {
      dc.SetPen(*wxRED_PEN);
      dc.SetBrush(*wxRED_BRUSH);
      // XXX: The adjusted values flip the Y axis to be in the format
      // the Wii expects. Should this be in WiimoteEmu.cpp instead?
      DrawCoordinate(dc, x, -y);
    }
  }
  break;
  case GROUP_TYPE_FORCE:
  {
    ControlState raw_dot[3];
    ControlState adj_dot[3];
    const ControlState deadzone = g->control_group->settings[0]->value;

    // adjusted
    ((ControllerEmu::Force*)g->control_group)->GetState(adj_dot);

    // raw
    for (unsigned int i = 0; i < 3; ++i)
    {
      raw_dot[i] = (g->control_group->controls[i * 2 + 1]->control_ref->State() -
                    g->control_group->controls[i * 2]->control_ref->State());
    }

    // deadzone rect for forward/backward visual
    dc.SetBrush(*wxLIGHT_GREY_BRUSH);
    dc.SetPen(*wxLIGHT_GREY_PEN);
    int deadzone_height = deadzone * VIS_BITMAP_SIZE;
    DrawCenteredRectangle(dc, 0, VIS_BITMAP_SIZE / 2, VIS_BITMAP_SIZE, deadzone_height);

#define LINE_HEIGHT 2
    int line_y;

    // raw forward/background line
    dc.SetPen(*wxGREY_PEN);
    dc.SetBrush(*wxGREY_BRUSH);
    line_y = VIS_COORD(raw_dot[2]);
    DrawCenteredRectangle(dc, VIS_BITMAP_SIZE / 2, line_y, VIS_BITMAP_SIZE, LINE_HEIGHT);

    // adjusted forward/background line
    if (adj_dot[2] != 0.0)
    {
      dc.SetPen(*wxRED_PEN);
      dc.SetBrush(*wxRED_BRUSH);
      line_y = VIS_COORD(adj_dot[2]);
      DrawCenteredRectangle(dc, VIS_BITMAP_SIZE / 2, line_y, VIS_BITMAP_SIZE, LINE_HEIGHT);
    }

#define DEADZONE_RECT_SIZE 32

    // empty deadzone square
    dc.SetBrush(*wxWHITE_BRUSH);
    dc.SetPen(*wxLIGHT_GREY_PEN);
    DrawCenteredRectangle(dc, VIS_BITMAP_SIZE / 2, VIS_BITMAP_SIZE / 2, DEADZONE_RECT_SIZE,
                          DEADZONE_RECT_SIZE);

    // deadzone square
    dc.SetBrush(*wxLIGHT_GREY_BRUSH);
    int dz_size = (deadzone * DEADZONE_RECT_SIZE);
    DrawCenteredRectangle(dc, VIS_BITMAP_SIZE / 2, VIS_BITMAP_SIZE / 2, dz_size, dz_size);

    // raw dot
    dc.SetPen(*wxGREY_PEN);
    dc.SetBrush(*wxGREY_BRUSH);
    DrawCoordinate(dc, raw_dot[1], raw_dot[0]);

    // adjusted dot
    if (adj_dot[1] != 0 && adj_dot[0] != 0)
    {
      dc.SetPen(*wxRED_PEN);
      dc.SetBrush(*wxRED_BRUSH);
      DrawCoordinate(dc, adj_dot[1], adj_dot[0]);
    }
  }
  break;
  case GROUP_TYPE_BUTTONS:
  {
    unsigned int button_count = ((unsigned int)g->control_group->controls.size());

    // draw the shit
    dc.SetPen(*wxGREY_PEN);

    unsigned int* const bitmasks = new unsigned int[button_count];
    for (unsigned int n = 0; n < button_count; ++n)
      bitmasks[n] = (1 << n);

    unsigned int buttons = 0;
    ((ControllerEmu::Buttons*)g->control_group)->GetState(&buttons, bitmasks);

    // Draw buttons in rows of 8
    for (unsigned int row = 0; row < ceil((float)button_count / 8.0f); row++)
    {
      unsigned int buttons_to_draw = 8;
      if ((button_count - row * 8) <= 8)
        buttons_to_draw = button_count - row * 8;

      for (unsigned int n = 0; n < buttons_to_draw; ++n)
      {
        DrawButton(bitmasks, buttons, n, dc, g, row);
      }
    }

    delete[] bitmasks;
  }
  break;
  case GROUP_TYPE_TRIGGERS:
  {
    const unsigned int trigger_count = ((unsigned int)(g->control_group->controls.size()));

    // draw the shit
    dc.SetPen(*wxGREY_PEN);
    ControlState deadzone = g->control_group->settings[0]->value;

    ControlState* const trigs = new ControlState[trigger_count];
    ((ControllerEmu::Triggers*)g->control_group)->GetState(trigs);

    for (unsigned int n = 0; n < trigger_count; ++n)
    {
      ControlState trig_r = g->control_group->controls[n]->control_ref->State();

      // outline
      dc.SetPen(*wxGREY_PEN);
      dc.SetBrush(*wxWHITE_BRUSH);
      dc.DrawRectangle(0, n * 12, 64, 14);

      // raw
      dc.SetBrush(*wxGREY_BRUSH);
      dc.DrawRectangle(0, n * 12, trig_r * 64, 14);

      // deadzone affected
      dc.SetBrush(*wxRED_BRUSH);
      dc.DrawRectangle(0, n * 12, trigs[n] * 64, 14);

      // text
      dc.DrawText(StrToWxStr(g->control_group->controls[n]->name), 3, n * 12 + 1);
    }

    delete[] trigs;

    // deadzone box
    dc.SetPen(*wxLIGHT_GREY_PEN);
    dc.SetBrush(*wxTRANSPARENT_BRUSH);
    dc.DrawRectangle(0, 0, deadzone * 64, trigger_count * 14);
  }
  break;
  case GROUP_TYPE_MIXED_TRIGGERS:
  {
    const unsigned int trigger_count = ((unsigned int)(g->control_group->controls.size() / 2));

    // draw the shit
    dc.SetPen(*wxGREY_PEN);
    ControlState thresh = g->control_group->settings[0]->value;

    for (unsigned int n = 0; n < trigger_count; ++n)
    {
      dc.SetBrush(*wxRED_BRUSH);
      ControlState trig_d = g->control_group->controls[n]->control_ref->State();

      ControlState trig_a =
          trig_d > thresh ? 1 : g->control_group->controls[n + trigger_count]->control_ref->State();

      dc.DrawRectangle(0, n * 12, 64 + 20, 14);
      if (trig_d <= thresh)
        dc.SetBrush(*wxWHITE_BRUSH);
      dc.DrawRectangle(trig_a * 64, n * 12, 64 + 20, 14);
      dc.DrawRectangle(64, n * 12, 32, 14);

      // text
      dc.DrawText(StrToWxStr(g->control_group->controls[n + trigger_count]->name), 3, n * 12 + 1);
      dc.DrawText(StrToWxStr(std::string(1, g->control_group->controls[n]->name[0])), 64 + 3,
                  n * 12 + 1);
    }

    // threshold box
    dc.SetPen(*wxLIGHT_GREY_PEN);
    dc.SetBrush(*wxTRANSPARENT_BRUSH);
    dc.DrawRectangle(thresh * 64, 0, 128, trigger_count * 14);
  }
  break;
  case GROUP_TYPE_SLIDER:
  {
    const ControlState deadzone = g->control_group->settings[0]->value;

    ControlState state = g->control_group->controls[1]->control_ref->State() -
                         g->control_group->controls[0]->control_ref->State();
    dc.SetPen(*wxGREY_PEN);
    dc.SetBrush(*wxGREY_BRUSH);
    dc.DrawRectangle(31 + state * 30, 0, 2, 14);

    ControlState adj_state;
    ((ControllerEmu::Slider*)g->control_group)->GetState(&adj_state);
    if (state)
    {
      dc.SetPen(*wxRED_PEN);
      dc.SetBrush(*wxRED_BRUSH);
      dc.DrawRectangle(31 + adj_state * 30, 0, 2, 14);
    }

    // deadzone box
    dc.SetPen(*wxLIGHT_GREY_PEN);
    dc.SetBrush(*wxTRANSPARENT_BRUSH);
    dc.DrawRectangle(32 - deadzone * 32, 0, deadzone * 64, 14);
  }
  break;
  default:
    break;
  }
}

void InputConfigDialog::UpdateBitmaps(wxTimerEvent& WXUNUSED(event))
{
  wxFont small_font(6, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_BOLD);

  g_controller_interface.UpdateInput();

  GamepadPage* const current_page =
      (GamepadPage*)m_pad_notebook->GetPage(m_pad_notebook->GetSelection());

  for (ControlGroupBox* g : current_page->control_groups)
  {
    // if this control group has a bitmap
    if (g->static_bitmap)
    {
      wxMemoryDC dc;
      wxBitmap bitmap(g->static_bitmap->GetBitmap());
      dc.SelectObject(bitmap);
      dc.Clear();

      dc.SetFont(small_font);
      dc.SetTextForeground(0xC0C0C0);

      DrawControlGroupBox(dc, g);

      // box outline
      // Windows XP color
      dc.SetPen(wxPen("#7f9db9"));
      dc.SetBrush(*wxTRANSPARENT_BRUSH);
      dc.DrawRectangle(0, 0, bitmap.GetWidth(), bitmap.GetHeight());

      // label for sticks and stuff
      if (64 == bitmap.GetHeight())
        dc.DrawText(StrToWxStr(g->control_group->name).Upper(), 4, 2);

      dc.SelectObject(wxNullBitmap);
      g->static_bitmap->SetBitmap(bitmap);
    }
  }
}
