// Copyright (c) 2015 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include <string>

#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "shell/common/keyboard_util.h"
#include "third_party/blink/public/common/input/web_input_event.h"
#include "ui/events/event_constants.h"

namespace electron {

namespace {

// Return key code represented by |str|.
ui::KeyboardCode KeyboardCodeFromKeyIdentifier(
    const std::string& s,
    base::Optional<char16_t>* shifted_char) {
  std::string str = base::ToLowerASCII(s);
  if (str == "ctrl" || str == "control") {
    return ui::VKEY_CONTROL;
  } else if (str == "super" || str == "cmd" || str == "command" ||
             str == "meta") {
    return ui::VKEY_COMMAND;
  } else if (str == "commandorcontrol" || str == "cmdorctrl") {
#if defined(OS_MAC)
    return ui::VKEY_COMMAND;
#else
    return ui::VKEY_CONTROL;
#endif
  } else if (str == "alt" || str == "option") {
    return ui::VKEY_MENU;
  } else if (str == "shift") {
    return ui::VKEY_SHIFT;
  } else if (str == "altgr") {
    return ui::VKEY_ALTGR;
  } else if (str == "plus") {
    shifted_char->emplace('+');
    return ui::VKEY_OEM_PLUS;
  } else if (str == "capslock") {
    return ui::VKEY_CAPITAL;
  } else if (str == "numlock") {
    return ui::VKEY_NUMLOCK;
  } else if (str == "scrolllock") {
    return ui::VKEY_SCROLL;
  } else if (str == "tab") {
    return ui::VKEY_TAB;
  } else if (str == "num0") {
    return ui::VKEY_NUMPAD0;
  } else if (str == "num1") {
    return ui::VKEY_NUMPAD1;
  } else if (str == "num2") {
    return ui::VKEY_NUMPAD2;
  } else if (str == "num3") {
    return ui::VKEY_NUMPAD3;
  } else if (str == "num4") {
    return ui::VKEY_NUMPAD4;
  } else if (str == "num5") {
    return ui::VKEY_NUMPAD5;
  } else if (str == "num6") {
    return ui::VKEY_NUMPAD6;
  } else if (str == "num7") {
    return ui::VKEY_NUMPAD7;
  } else if (str == "num8") {
    return ui::VKEY_NUMPAD8;
  } else if (str == "num9") {
    return ui::VKEY_NUMPAD9;
  } else if (str == "numadd") {
    return ui::VKEY_ADD;
  } else if (str == "nummult") {
    return ui::VKEY_MULTIPLY;
  } else if (str == "numdec") {
    return ui::VKEY_DECIMAL;
  } else if (str == "numsub") {
    return ui::VKEY_SUBTRACT;
  } else if (str == "numdiv") {
    return ui::VKEY_DIVIDE;
  } else if (str == "space") {
    return ui::VKEY_SPACE;
  } else if (str == "backspace") {
    return ui::VKEY_BACK;
  } else if (str == "delete") {
    return ui::VKEY_DELETE;
  } else if (str == "insert") {
    return ui::VKEY_INSERT;
  } else if (str == "enter" || str == "return") {
    return ui::VKEY_RETURN;
  } else if (str == "up") {
    return ui::VKEY_UP;
  } else if (str == "down") {
    return ui::VKEY_DOWN;
  } else if (str == "left") {
    return ui::VKEY_LEFT;
  } else if (str == "right") {
    return ui::VKEY_RIGHT;
  } else if (str == "home") {
    return ui::VKEY_HOME;
  } else if (str == "end") {
    return ui::VKEY_END;
  } else if (str == "pageup") {
    return ui::VKEY_PRIOR;
  } else if (str == "pagedown") {
    return ui::VKEY_NEXT;
  } else if (str == "esc" || str == "escape") {
    return ui::VKEY_ESCAPE;
  } else if (str == "volumemute") {
    return ui::VKEY_VOLUME_MUTE;
  } else if (str == "volumeup") {
    return ui::VKEY_VOLUME_UP;
  } else if (str == "volumedown") {
    return ui::VKEY_VOLUME_DOWN;
  } else if (str == "medianexttrack") {
    return ui::VKEY_MEDIA_NEXT_TRACK;
  } else if (str == "mediaprevioustrack") {
    return ui::VKEY_MEDIA_PREV_TRACK;
  } else if (str == "mediastop") {
    return ui::VKEY_MEDIA_STOP;
  } else if (str == "mediaplaypause") {
    return ui::VKEY_MEDIA_PLAY_PAUSE;
  } else if (str == "printscreen") {
    return ui::VKEY_SNAPSHOT;
  } else if (str.size() > 1 && str[0] == 'f') {
    // F1 - F24.
    int n;
    if (base::StringToInt(str.c_str() + 1, &n) && n > 0 && n < 25) {
      return static_cast<ui::KeyboardCode>(ui::VKEY_F1 + n - 1);
    } else {
      LOG(WARNING) << str << "is not available on keyboard";
      return ui::VKEY_UNKNOWN;
    }
  } else {
    if (str.size() > 2)
      LOG(WARNING) << "Invalid accelerator token: " << str;
    return ui::VKEY_UNKNOWN;
  }
}

}  // namespace

ui::KeyboardCode KeyboardCodeFromCharCode(char16_t c, bool* shifted) {
  c = base::ToLowerASCII(c);
  *shifted = false;
  switch (c) {
    case 0x08:
      return ui::VKEY_BACK;
    case 0x7F:
      return ui::VKEY_DELETE;
    case 0x09:
      return ui::VKEY_TAB;
    case 0x0D:
      return ui::VKEY_RETURN;
    case 0x1B:
      return ui::VKEY_ESCAPE;
    case ' ':
      return ui::VKEY_SPACE;
    case 'a':
      return ui::VKEY_A;
    case 'b':
      return ui::VKEY_B;
    case 'c':
      return ui::VKEY_C;
    case 'd':
      return ui::VKEY_D;
    case 'e':
      return ui::VKEY_E;
    case 'f':
      return ui::VKEY_F;
    case 'g':
      return ui::VKEY_G;
    case 'h':
      return ui::VKEY_H;
    case 'i':
      return ui::VKEY_I;
    case 'j':
      return ui::VKEY_J;
    case 'k':
      return ui::VKEY_K;
    case 'l':
      return ui::VKEY_L;
    case 'm':
      return ui::VKEY_M;
    case 'n':
      return ui::VKEY_N;
    case 'o':
      return ui::VKEY_O;
    case 'p':
      return ui::VKEY_P;
    case 'q':
      return ui::VKEY_Q;
    case 'r':
      return ui::VKEY_R;
    case 's':
      return ui::VKEY_S;
    case 't':
      return ui::VKEY_T;
    case 'u':
      return ui::VKEY_U;
    case 'v':
      return ui::VKEY_V;
    case 'w':
      return ui::VKEY_W;
    case 'x':
      return ui::VKEY_X;
    case 'y':
      return ui::VKEY_Y;
    case 'z':
      return ui::VKEY_Z;

    case ')':
      *shifted = true;
      FALLTHROUGH;
    case '0':
      return ui::VKEY_0;
    case '!':
      *shifted = true;
      FALLTHROUGH;
    case '1':
      return ui::VKEY_1;
    case '@':
      *shifted = true;
      FALLTHROUGH;
    case '2':
      return ui::VKEY_2;
    case '#':
      *shifted = true;
      FALLTHROUGH;
    case '3':
      return ui::VKEY_3;
    case '$':
      *shifted = true;
      FALLTHROUGH;
    case '4':
      return ui::VKEY_4;
    case '%':
      *shifted = true;
      FALLTHROUGH;
    case '5':
      return ui::VKEY_5;
    case '^':
      *shifted = true;
      FALLTHROUGH;
    case '6':
      return ui::VKEY_6;
    case '&':
      *shifted = true;
      FALLTHROUGH;
    case '7':
      return ui::VKEY_7;
    case '*':
      *shifted = true;
      FALLTHROUGH;
    case '8':
      return ui::VKEY_8;
    case '(':
      *shifted = true;
      FALLTHROUGH;
    case '9':
      return ui::VKEY_9;

    case ':':
      *shifted = true;
      FALLTHROUGH;
    case ';':
      return ui::VKEY_OEM_1;
    case '+':
      *shifted = true;
      FALLTHROUGH;
    case '=':
      return ui::VKEY_OEM_PLUS;
    case '<':
      *shifted = true;
      FALLTHROUGH;
    case ',':
      return ui::VKEY_OEM_COMMA;
    case '_':
      *shifted = true;
      FALLTHROUGH;
    case '-':
      return ui::VKEY_OEM_MINUS;
    case '>':
      *shifted = true;
      FALLTHROUGH;
    case '.':
      return ui::VKEY_OEM_PERIOD;
    case '?':
      *shifted = true;
      FALLTHROUGH;
    case '/':
      return ui::VKEY_OEM_2;
    case '~':
      *shifted = true;
      FALLTHROUGH;
    case '`':
      return ui::VKEY_OEM_3;
    case '{':
      *shifted = true;
      FALLTHROUGH;
    case '[':
      return ui::VKEY_OEM_4;
    case '|':
      *shifted = true;
      FALLTHROUGH;
    case '\\':
      return ui::VKEY_OEM_5;
    case '}':
      *shifted = true;
      FALLTHROUGH;
    case ']':
      return ui::VKEY_OEM_6;
    case '"':
      *shifted = true;
      FALLTHROUGH;
    case '\'':
      return ui::VKEY_OEM_7;

    default:
      return ui::VKEY_UNKNOWN;
  }
}

ui::KeyboardCode KeyboardCodeFromStr(const std::string& str,
                                     base::Optional<char16_t>* shifted_char) {
  if (str.size() == 1) {
    bool shifted = false;
    auto ret = KeyboardCodeFromCharCode(str[0], &shifted);
    if (shifted)
      shifted_char->emplace(str[0]);
    return ret;
  } else {
    return KeyboardCodeFromKeyIdentifier(str, shifted_char);
  }
}

}  // namespace electron
