/*
 * PlayerController.cpp
 *
 *  Created on: Nov 27, 2016
 *      Author: tibi
 */

#include <GameState.h>
#include <controller/items/Giftable.h>
#include <controller/items/Weapon.h>
#include <controller/player/PlayerController.h>
#include <graphics/SpriteRenderer.h>
#include <input/Input.h>
#include <model/Item.h>
#include <utils/Assert.h>

#include <iostream>

using namespace farmlands::base;
using namespace farmlands::controller::items;
using namespace farmlands::graphics;
using namespace farmlands::input;
using namespace farmlands::model;

namespace farmlands {
namespace controller {
namespace player {

static const float PlayerWalkVelocity = 2.0f;			// The default velocity of the player when walking (units/sec).
static const float PlayerRunVelocity = 4.0f;			// The default velocity of the player when running (units/sec).
static const float PlayerAttackVelocity = 0.1f;			// Movement speed when attacking.

/**
 * Direction enum based on sign of velocity on x and y
 */
static const Direction VelocitySignDirections[3][3] =
{
	{ Direction::NorthWest, Direction::West, Direction::SouthWest },
	{ Direction::North, Direction::None, Direction::South },
	{ Direction::NorthEast, Direction::East, Direction::SouthEast },
};

PlayerController::PlayerController()
	: m_transform(nullptr),
	  m_facingDirection(Direction::South),
	  m_walking(false),
	  m_running(false),
	  m_currentItem(nullptr)
{
}

PlayerController::~PlayerController()
{
}

base::Component* PlayerController::clone()
{
	return new PlayerController();
}

void PlayerController::onInitialize()
{
	m_transform = gameObject->component<base::Transform>();
}

bool PlayerController::onEvent(SDL_Event& event)
{
	handleAttackEvents(event);
	handleInventoryEvents(event);

	return false;
}

void PlayerController::handleAttackEvents(SDL_Event& event)
{
	bool attack = (Input::instance().down(GameKey::Action, event));
	if (attack && m_currentItem != nullptr)
	{
		// Weapon behavior
		Weapon* weapon = m_currentItem->component<Weapon>();
		if (weapon)
			weapon->performAttack(m_transform->x, m_transform->y, m_facingDirection);

		// Gift behavior
		Giftable* giftable = m_currentItem->component<Giftable>();
		if (giftable)
			giftable->offerGift(m_transform->x, m_transform->y, m_facingDirection);
	}
}

void PlayerController::handleInventoryEvents(SDL_Event& event)
{
	// See what key was pressed
	int slot = -1;

	if (Input::instance().down(GameKey::Inventory1, event)) slot = 1;
	if (Input::instance().down(GameKey::Inventory2, event)) slot = 2;
	if (Input::instance().down(GameKey::Inventory3, event)) slot = 3;
	if (Input::instance().down(GameKey::Inventory4, event)) slot = 4;
	if (Input::instance().down(GameKey::Inventory5, event)) slot = 5;
	if (Input::instance().down(GameKey::Inventory6, event)) slot = 6;
	if (Input::instance().down(GameKey::Inventory7, event)) slot = 7;
	if (Input::instance().down(GameKey::Inventory8, event)) slot = 8;
	if (Input::instance().down(GameKey::Inventory9, event)) slot = 9;
	if (Input::instance().down(GameKey::Inventory10, event)) slot = 10;

	// For now we don't have an inventory, so just instantiate some object
	if (0 <= slot && slot <= GameState::current().itemPrefabs.size())
	{
		GameObject* itemPrefab = GameState::current().itemPrefabs[slot - 1];

		// Get rid of old object
		if (m_currentItem != nullptr)
			gameObject->destroyChild(m_currentItem);

		// Instantiate new object
		m_currentItem = GameObject::instantiate(itemPrefab, "Current item", gameObject);

		// Print some information
//		Item* item = itemPrefab->component<Item>();
//		std::string name = (item == nullptr) ? "unknown" : item->name;
//		std::cout << "Instantiated object " << slot << " (" << name << ")\n";
	}
	else if (0 <= slot)
	{
		std::cout << "Slot " << slot << "empty\n";
	}
}

void PlayerController::onUpdateLogic()
{
	m_running = false;
	m_walking = false;

	// Compute movement velocity
	float velMultiplier = PlayerWalkVelocity;

//	if (m_attackTimeLeft)
//	{
//		velMultiplier = PlayerAttackVelocity;
//		--m_attackTimeLeft;
//	} else

	if (Input::instance().pressed(GameKey::Run))
	{
		velMultiplier = PlayerRunVelocity;
		m_running = true;
	}


	// Make movement time independent
	velMultiplier *= GameState::current().elapsedTime;

	// Get velocity of axes
	float vx = Input::instance().getX() * velMultiplier;
	float vy = Input::instance().getY() * velMultiplier;

	// Check if we can move to the new position
	float newX = m_transform->x + vx;
	float newY = m_transform->y + vy;
	if ((vx || vy) && canMove(newX, newY))
	{
		m_walking = true;
		m_transform->x = newX;
		m_transform->y = newY;

		m_facingDirection = getDirection(vx, vy);
	}
}

void PlayerController::onPreRender()
{
	// Get sprite
	SpriteRenderer* spriteRenderer = gameObject->component<SpriteRenderer>();

	// Compute current state
	std::string stateName = (m_walking) ? "Walking " : "Idle ";

	if (m_facingDirection & Direction::East)
		stateName += "right";
	else if (m_facingDirection & Direction::West)
		stateName += "left";
	else if (m_facingDirection & Direction::North)
		stateName += "up";
	else
		stateName += "down";

	spriteRenderer->sprite->setState(stateName);

	// Set animation velocity
	float animVelocity = (m_running) ? 1.0f : 0.7f;
//	if (m_attackTimeLeft)
//		animVelocity = 0.1f;

	spriteRenderer->sprite->setAnimationVelocity(animVelocity);

	// Set weapon
	if (m_currentItem)
	{
		Transform* itemTransf = m_currentItem->component<Transform>();
		itemTransf->x = 0.2f;
		itemTransf->y = -0.8f;
	}

	// Set camera
	base::Transform* cam = GameState::current().renderContext.cameraTransform();
	cam->x = m_transform->x;
	cam->y = m_transform->y - 1;
}

bool PlayerController::canMove(float x, float y)
{
	// TODO: check collisions & stuff. For now, nothing
	return true;
}

Direction PlayerController::getDirection(float vx, float vy)
{
	int xx = (0 < vx) - (vx < 0);
	int yy = (0 < vy) - (vy < 0);

	return VelocitySignDirections[xx + 1][yy + 1];
}

void PlayerController::attack()
{
	// For now - nothing
}

void PlayerController::dump(unsigned level)
{
	for (unsigned i = 0; i < level; i++)
		std::cout<<"    ";

	std::cout << "  .Component: PlayerController\n";
}

}
} /* namespace controller */
} /* namespace farmlands */