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

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
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   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

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

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

/** @cond */
namespace juce::universal_midi_packets
{

/**
    Holds a single Universal MIDI Packet.

    @tags{Audio}
*/
template <size_t numWords>
class Packet
{
public:
    Packet() = default;

    template <size_t w = numWords, std::enable_if_t<w == 1, int> = 0>
    Packet (uint32_t a)
        : contents { { a } }
    {
        jassert (Utils::getNumWordsForMessageType (a) == 1);
    }

    template <size_t w = numWords, std::enable_if_t<w == 2, int> = 0>
    Packet (uint32_t a, uint32_t b)
        : contents { { a, b } }
    {
        jassert (Utils::getNumWordsForMessageType (a) == 2);
    }

    template <size_t w = numWords, std::enable_if_t<w == 3, int> = 0>
    Packet (uint32_t a, uint32_t b, uint32_t c)
        : contents { { a, b, c } }
    {
        jassert (Utils::getNumWordsForMessageType (a) == 3);
    }

    template <size_t w = numWords, std::enable_if_t<w == 4, int> = 0>
    Packet (uint32_t a, uint32_t b, uint32_t c, uint32_t d)
        : contents { { a, b, c, d } }
    {
        jassert (Utils::getNumWordsForMessageType (a) == 4);
    }

    template <size_t w, std::enable_if_t<w == numWords, int> = 0>
    explicit Packet (const std::array<uint32_t, w>& fullPacket)
        : contents (fullPacket)
    {
        jassert (Utils::getNumWordsForMessageType (fullPacket.front()) == numWords);
    }

    Packet withMessageType (Utils::MessageKind type) const noexcept
    {
        return withU4<0> (uint8_t (type));
    }

    Packet withGroup (uint8_t group) const noexcept
    {
        return withU4<1> (group);
    }

    Packet withStatus (std::byte status) const noexcept
    {
        return withU4<2> (uint8_t (status));
    }

    Packet withChannel (uint8_t channel) const noexcept
    {
        return withU4<3> (channel);
    }

    Utils::MessageKind getMessageType() const noexcept { return Utils::MessageKind (getU4<0>()); }

    uint8_t getGroup() const noexcept { return getU4<1>(); }

    std::byte getStatus() const noexcept { return getU4<2>(); }

    uint8_t getChannel() const noexcept { return getU4<3>(); }

    template <size_t index>
    Packet withU4 (uint8_t value) const noexcept
    {
        constexpr auto word = index / 8;
        auto copy = *this;
        std::get<word> (copy.contents) = Utils::U4<index % 8>::set (copy.template getU32<word>(), value);
        return copy;
    }

    template <size_t index>
    Packet withU8 (uint8_t value) const noexcept
    {
        constexpr auto word = index / 4;
        auto copy = *this;
        std::get<word> (copy.contents) = Utils::U8<index % 4>::set (copy.template getU32<word>(), value);
        return copy;
    }

    template <size_t index>
    Packet withU16 (uint16_t value) const noexcept
    {
        constexpr auto word = index / 2;
        auto copy = *this;
        std::get<word> (copy.contents) = Utils::U16<index % 2>::set (copy.template getU32<word>(), value);
        return copy;
    }

    template <size_t index>
    Packet withU32 (uint32_t value) const noexcept
    {
        auto copy = *this;
        std::get<index> (copy.contents) = value;
        return copy;
    }

    template <size_t index>
    uint8_t getU4() const noexcept
    {
        return Utils::U4<index % 8>::get (this->template getU32<index / 8>());
    }

    template <size_t index>
    uint8_t getU8() const noexcept
    {
        return Utils::U8<index % 4>::get (this->template getU32<index / 4>());
    }

    template <size_t index>
    uint16_t getU16() const noexcept
    {
        return Utils::U16<index % 2>::get (this->template getU32<index / 2>());
    }

    template <size_t index>
    uint32_t getU32() const noexcept
    {
        return std::get<index> (contents);
    }

    //==============================================================================
    using Contents = std::array<uint32_t, numWords>;

    using const_iterator    = typename Contents::const_iterator;

    const_iterator  begin()                   const noexcept { return contents.begin(); }
    const_iterator cbegin()                   const noexcept { return contents.begin(); }

    const_iterator  end()                     const noexcept { return contents.end(); }
    const_iterator cend()                     const noexcept { return contents.end(); }

    const uint32_t* data()                    const noexcept { return contents.data(); }
    size_t size()                             const noexcept { return contents.size(); }

    const uint32_t& front()                   const noexcept { return contents.front(); }
    const uint32_t& back()                    const noexcept { return contents.back(); }

    const uint32_t& operator[] (size_t index) const noexcept { return contents[index]; }

private:
    Contents contents { {} };
};

using PacketX1 = Packet<1>;
using PacketX2 = Packet<2>;
using PacketX3 = Packet<3>;
using PacketX4 = Packet<4>;

} // namespace juce::universal_midi_packets
/** @endcond */