#include <gb/interface/interface.hpp>

struct GameBoy : Emulator {
  GameBoy();
  auto load() -> bool override;
  auto open(ares::Node::Object, string name, vfs::file::mode mode, bool required) -> shared_pointer<vfs::file> override;
  auto input(ares::Node::Input) -> void override;
};

struct GameBoyColor : Emulator {
  GameBoyColor();
  auto load() -> bool override;
  auto open(ares::Node::Object, string name, vfs::file::mode mode, bool required) -> shared_pointer<vfs::file> override;
  auto input(ares::Node::Input) -> void override;
};

GameBoy::GameBoy() {
  interface = new ares::GameBoy::GameBoyInterface;
  name = "Game Boy";
  extensions = {"gb"};
}

auto GameBoy::load() -> bool {
  if(auto port = root->find<ares::Node::Port>("Cartridge Slot")) {
    auto peripheral = port->allocate();
    port->connect(peripheral);
  }

  return true;
}

auto GameBoy::open(ares::Node::Object node, string name, vfs::file::mode mode, bool required) -> shared_pointer<vfs::file> {
  if(name == "manifest.bml") return Emulator::manifest();

  if(name == "boot.dmg-1.rom") {
    return vfs::memory::file::open(Resource::GameBoy::BootDMG1, sizeof Resource::GameBoy::BootDMG1);
  }

  auto document = BML::unserialize(game.manifest);
  auto programROMSize = document["game/board/memory(content=Program,type=ROM)/size"].natural();
  auto saveRAMVolatile = (bool)document["game/board/memory(Content=Save,type=RAM)/volatile"];

  if(name == "program.rom") {
    return vfs::memory::file::open(game.image.data(), programROMSize);
  }

  if(name == "save.ram" && !saveRAMVolatile) {
    auto location = locate(game.location, ".sav", settings.paths.saves);
    if(auto result = vfs::fs::file::open(location, mode)) return result;
  }

  return {};
}

auto GameBoy::input(ares::Node::Input node) -> void {
  auto name = node->name();
  maybe<InputMapping&> mapping;
  if(name == "Up"    ) mapping = virtualPad.up;
  if(name == "Down"  ) mapping = virtualPad.down;
  if(name == "Left"  ) mapping = virtualPad.left;
  if(name == "Right" ) mapping = virtualPad.right;
  if(name == "B"     ) mapping = virtualPad.a;
  if(name == "A"     ) mapping = virtualPad.b;
  if(name == "Select") mapping = virtualPad.select;
  if(name == "Start" ) mapping = virtualPad.start;

  if(mapping) {
    auto value = mapping->value();
    if(auto button = node->cast<ares::Node::Button>()) {
      button->setValue(value);
    }
  }
}

GameBoyColor::GameBoyColor() {
  interface = new ares::GameBoy::GameBoyColorInterface;
  name = "Game Boy Color";
  extensions = {"gbc"};
}

auto GameBoyColor::load() -> bool {
  if(auto port = root->find<ares::Node::Port>("Cartridge Slot")) {
    auto peripheral = port->allocate();
    port->connect(peripheral);
  }

  return true;
}

auto GameBoyColor::open(ares::Node::Object node, string name, vfs::file::mode mode, bool required) -> shared_pointer<vfs::file> {
  if(name == "manifest.bml") return Emulator::manifest();

  if(name == "boot.cgb-0.rom") {
    return vfs::memory::file::open(Resource::GameBoyColor::BootCGB0, sizeof Resource::GameBoyColor::BootCGB0);
  }

  auto document = BML::unserialize(game.manifest);
  auto programROMSize = document["game/board/memory(content=Program,type=ROM)/size"].natural();
  auto saveRAMVolatile = (bool)document["game/board/memory(Content=Save,type=RAM)/volatile"];

  if(name == "program.rom") {
    return vfs::memory::file::open(game.image.data(), programROMSize);
  }

  if(name == "save.ram" && !saveRAMVolatile) {
    auto location = locate(game.location, ".sav", settings.paths.saves);
    if(auto result = vfs::fs::file::open(location, mode)) return result;
  }

  return {};
}

auto GameBoyColor::input(ares::Node::Input node) -> void {
  auto name = node->name();
  maybe<InputMapping&> mapping;
  if(name == "Up"    ) mapping = virtualPad.up;
  if(name == "Down"  ) mapping = virtualPad.down;
  if(name == "Left"  ) mapping = virtualPad.left;
  if(name == "Right" ) mapping = virtualPad.right;
  if(name == "B"     ) mapping = virtualPad.a;
  if(name == "A"     ) mapping = virtualPad.b;
  if(name == "Select") mapping = virtualPad.select;
  if(name == "Start" ) mapping = virtualPad.start;

  if(mapping) {
    auto value = mapping->value();
    if(auto button = node->cast<ares::Node::Button>()) {
      button->setValue(value);
    }
  }
}
