/*
  ==============================================================================

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

KeyPress::KeyPress (int code, ModifierKeys m, juce_wchar textChar) noexcept
    : keyCode (code), mods (m), textCharacter (textChar)
{
}

KeyPress::KeyPress (const int code) noexcept  : keyCode (code)
{
}

bool KeyPress::operator== (int otherKeyCode) const noexcept
{
    return keyCode == otherKeyCode && ! mods.isAnyModifierKeyDown();
}

bool KeyPress::operator== (const KeyPress& other) const noexcept
{
    return mods.getRawFlags() == other.mods.getRawFlags()
            && (textCharacter == other.textCharacter
                 || textCharacter == 0
                 || other.textCharacter == 0)
            && (keyCode == other.keyCode
                 || (keyCode < 256
                      && other.keyCode < 256
                      && CharacterFunctions::toLowerCase ((juce_wchar) keyCode)
                           == CharacterFunctions::toLowerCase ((juce_wchar) other.keyCode)));
}

bool KeyPress::operator!= (const KeyPress& other) const noexcept    { return ! operator== (other); }
bool KeyPress::operator!= (int otherKeyCode) const noexcept         { return ! operator== (otherKeyCode); }

bool KeyPress::isCurrentlyDown() const
{
    return isKeyCurrentlyDown (keyCode)
            && (ModifierKeys::currentModifiers.getRawFlags() & ModifierKeys::allKeyboardModifiers)
                  == (mods.getRawFlags() & ModifierKeys::allKeyboardModifiers);
}

//==============================================================================
namespace KeyPressHelpers
{
    struct KeyNameAndCode
    {
        const char* name;
        int code;
    };

    const KeyNameAndCode translations[] =
    {
        { "spacebar",       KeyPress::spaceKey },
        { "return",         KeyPress::returnKey },
        { "escape",         KeyPress::escapeKey },
        { "backspace",      KeyPress::backspaceKey },
        { "cursor left",    KeyPress::leftKey },
        { "cursor right",   KeyPress::rightKey },
        { "cursor up",      KeyPress::upKey },
        { "cursor down",    KeyPress::downKey },
        { "page up",        KeyPress::pageUpKey },
        { "page down",      KeyPress::pageDownKey },
        { "home",           KeyPress::homeKey },
        { "end",            KeyPress::endKey },
        { "delete",         KeyPress::deleteKey },
        { "insert",         KeyPress::insertKey },
        { "tab",            KeyPress::tabKey },
        { "play",           KeyPress::playKey },
        { "stop",           KeyPress::stopKey },
        { "fast forward",   KeyPress::fastForwardKey },
        { "rewind",         KeyPress::rewindKey }
    };

    struct ModifierDescription
    {
        const char* name;
        int flag;
    };

    static const ModifierDescription modifierNames[] =
    {
        { "ctrl",      ModifierKeys::ctrlModifier },
        { "control",   ModifierKeys::ctrlModifier },
        { "ctl",       ModifierKeys::ctrlModifier },
        { "shift",     ModifierKeys::shiftModifier },
        { "shft",      ModifierKeys::shiftModifier },
        { "alt",       ModifierKeys::altModifier },
        { "option",    ModifierKeys::altModifier },
        { "command",   ModifierKeys::commandModifier },
        { "cmd",       ModifierKeys::commandModifier }
    };

    static const char* numberPadPrefix() noexcept      { return "numpad "; }

    static int getNumpadKeyCode (const String& desc)
    {
        if (desc.containsIgnoreCase (numberPadPrefix()))
        {
            auto lastChar = desc.trimEnd().getLastCharacter();

            switch (lastChar)
            {
                case '0': case '1': case '2': case '3': case '4':
                case '5': case '6': case '7': case '8': case '9':
                    return (int) (KeyPress::numberPad0 + (int) lastChar - '0');

                case '+':   return KeyPress::numberPadAdd;
                case '-':   return KeyPress::numberPadSubtract;
                case '*':   return KeyPress::numberPadMultiply;
                case '/':   return KeyPress::numberPadDivide;
                case '.':   return KeyPress::numberPadDecimalPoint;
                case '=':   return KeyPress::numberPadEquals;

                default:    break;
            }

            if (desc.endsWith ("separator"))  return KeyPress::numberPadSeparator;
            if (desc.endsWith ("delete"))     return KeyPress::numberPadDelete;
        }

        return 0;
    }

   #if JUCE_MAC || JUCE_IOS
    struct OSXSymbolReplacement
    {
        const char* text;
        juce_wchar symbol;
    };

    const OSXSymbolReplacement osxSymbols[] =
    {
        { "shift + ",     0x21e7 },
        { "command + ",   0x2318 },
        { "option + ",    0x2325 },
        { "ctrl + ",      0x2303 },
        { "return",       0x21b5 },
        { "cursor left",  0x2190 },
        { "cursor right", 0x2192 },
        { "cursor up",    0x2191 },
        { "cursor down",  0x2193 },
        { "backspace",    0x232b },
        { "delete",       0x2326 },
        { "spacebar",     0x2423 }
    };
   #endif
}

//==============================================================================
KeyPress KeyPress::createFromDescription (const String& desc)
{
    int modifiers = 0;

    for (int i = 0; i < numElementsInArray (KeyPressHelpers::modifierNames); ++i)
        if (desc.containsWholeWordIgnoreCase (KeyPressHelpers::modifierNames[i].name))
            modifiers |= KeyPressHelpers::modifierNames[i].flag;

    int key = 0;

    for (int i = 0; i < numElementsInArray (KeyPressHelpers::translations); ++i)
    {
        if (desc.containsWholeWordIgnoreCase (String (KeyPressHelpers::translations[i].name)))
        {
            key = KeyPressHelpers::translations[i].code;
            break;
        }
    }

    if (key == 0)
        key = KeyPressHelpers::getNumpadKeyCode (desc);

    if (key == 0)
    {
        // see if it's a function key..
        if (! desc.containsChar ('#')) // avoid mistaking hex-codes like "#f1"
        {
            for (int i = 1; i <= 35; ++i)
            {
                if (desc.containsWholeWordIgnoreCase ("f" + String (i)))
                {
                    if (i <= 16)        key = F1Key + i - 1;
                    else if (i <= 24)   key = F17Key + i - 17;
                    else if (i <= 35)   key = F25Key + i - 25;
                }
            }
        }

        if (key == 0)
        {
            // give up and use the hex code..
            auto hexCode = desc.fromFirstOccurrenceOf ("#", false, false)
                               .retainCharacters ("0123456789abcdefABCDEF")
                               .getHexValue32();

            if (hexCode > 0)
                key = hexCode;
            else
                key = (int) CharacterFunctions::toUpperCase (desc.getLastCharacter());
        }
    }

    return KeyPress (key, ModifierKeys (modifiers), 0);
}

String KeyPress::getTextDescription() const
{
    String desc;

    if (keyCode > 0)
    {
        // some keyboard layouts use a shift-key to get the slash, but in those cases, we
        // want to store it as being a slash, not shift+whatever.
        if (textCharacter == '/' && keyCode != numberPadDivide)
            return "/";

        if (mods.isCtrlDown())      desc << "ctrl + ";
        if (mods.isShiftDown())     desc << "shift + ";

       #if JUCE_MAC || JUCE_IOS
        if (mods.isAltDown())       desc << "option + ";
        if (mods.isCommandDown())   desc << "command + ";
       #else
        if (mods.isAltDown())       desc << "alt + ";
       #endif

        for (int i = 0; i < numElementsInArray (KeyPressHelpers::translations); ++i)
            if (keyCode == KeyPressHelpers::translations[i].code)
                return desc + KeyPressHelpers::translations[i].name;

        // not all F keys have consecutive key codes on all platforms
        if      (keyCode >= F1Key  && keyCode <= F16Key)                  desc << 'F' << (1 + keyCode - F1Key);
        else if (keyCode >= F17Key && keyCode <= F24Key)                  desc << 'F' << (17 + keyCode - F17Key);
        else if (keyCode >= F25Key && keyCode <= F35Key)                  desc << 'F' << (25 + keyCode - F25Key);
        else if (keyCode >= numberPad0 && keyCode <= numberPad9)    desc << KeyPressHelpers::numberPadPrefix() << (keyCode - numberPad0);
        else if (keyCode >= 33 && keyCode < 176)        desc += CharacterFunctions::toUpperCase ((juce_wchar) keyCode);
        else if (keyCode == numberPadAdd)               desc << KeyPressHelpers::numberPadPrefix() << '+';
        else if (keyCode == numberPadSubtract)          desc << KeyPressHelpers::numberPadPrefix() << '-';
        else if (keyCode == numberPadMultiply)          desc << KeyPressHelpers::numberPadPrefix() << '*';
        else if (keyCode == numberPadDivide)            desc << KeyPressHelpers::numberPadPrefix() << '/';
        else if (keyCode == numberPadSeparator)         desc << KeyPressHelpers::numberPadPrefix() << "separator";
        else if (keyCode == numberPadDecimalPoint)      desc << KeyPressHelpers::numberPadPrefix() << '.';
        else if (keyCode == numberPadEquals)            desc << KeyPressHelpers::numberPadPrefix() << '=';
        else if (keyCode == numberPadDelete)            desc << KeyPressHelpers::numberPadPrefix() << "delete";
        else                                            desc << '#' << String::toHexString (keyCode);
    }

    return desc;
}

String KeyPress::getTextDescriptionWithIcons() const
{
   #if JUCE_MAC || JUCE_IOS
    auto s = getTextDescription();

    for (int i = 0; i < numElementsInArray (KeyPressHelpers::osxSymbols); ++i)
        s = s.replace (KeyPressHelpers::osxSymbols[i].text,
                       String::charToString (KeyPressHelpers::osxSymbols[i].symbol));

    return s;
   #else
    return getTextDescription();
   #endif
}

} // namespace juce