#include "player_body.h"
#include "break_utopia/level_status.h"
#include "break_utopia/player_camera.h"
#include "core/config/engine.h"
#include "core/input/input.h"
#include "scene/3d/camera_3d.h"
#include "scene/main/node.h"
#include "scene/main/viewport.h"

void PlayerBody::_bind_methods() {
}

void PlayerBody::physics_process(double delta) {
	move_and_slide();
}

void PlayerBody::on_child_entered(Node *node) {
	if (CharacterState * state{ cast_to<CharacterState>(node) }) {
		if (!this->default_state) {
			this->default_state = state;
		}
	}
}

void PlayerBody::_notification(int what) {
	if (Engine::get_singleton()->is_editor_hint()) {
		return;
	}
	switch (what) {
		default:
			return;
		case NOTIFICATION_ENTER_TREE:
			singleton = this;
			set_process_unhandled_input(true);
			set_physics_process(true);
			if (!is_ready()) {
				connect("child_entered_tree", callable_mp(this, &self_type::on_child_entered));
			}
			Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_CAPTURED);
			return;
		case NOTIFICATION_READY:
			if (this->default_state) {
				this->default_state->set_state_active(true);
			}
			return;
		case NOTIFICATION_PHYSICS_PROCESS:
			physics_process(get_physics_process_delta_time());
			return;
		case NOTIFICATION_PAUSED:
			this->movement_input = {};
			return;
		case NOTIFICATION_EXIT_TREE:
			singleton = nullptr;
			return;
	}
}

void PlayerBody::process_movement_input() {
	this->movement_input = {
		Input::get_singleton()->get_axis("move_left", "move_right"),
		Input::get_singleton()->get_axis("move_forward", "move_backward")
	};
	this->movement_input.normalize();
}

void PlayerBody::unhandled_input(Ref<InputEvent> const &what) {
	if (what->is_action("move_forward") || what->is_action("move_backward") || what->is_action("move_left") || what->is_action("move_right")) {
		process_movement_input();
	}
}

PlayerBody *PlayerBody::get_singleton() {
	return singleton;
}

void PlayerBody::deal_damage(double damage) {
	double health{ LevelStatus::get_instance()->get_player_health() };
	LevelStatus::get_instance()->set_player_health(health - damage);
	for (Variant var : get_children()) {
		if (CharacterState * as_state{ cast_to<CharacterState>(var) }) {
			if (as_state->get_state_active()) {
				as_state->set_state_active(false);
			}
		}
	}
	Node *node{ get_node(NodePath("PlayerHurtState")) };
	if (CharacterState * as_state{ cast_to<CharacterState>(node) }) {
		as_state->set_state_active(true);
	}
}

Vector3 PlayerBody::get_transformed_movement_input() const {
	Basis const basis{ get_viewport()->get_camera_3d()->get_global_basis() };
	Vector3 forward{ basis.get_column(2) };
	Vector3 left{ basis.get_column(0) };
	forward.y = left.y = 0;
	return forward.normalized() * this->movement_input.y + left.normalized() * this->movement_input.x;
}

PlayerBody *PlayerBody::singleton{ nullptr };

String const CharacterState::sig_state_entered{ "state_entered" };
String const CharacterState::sig_state_exited{ "state_exited" };

void CharacterState::_bind_methods() {
	ADD_SIGNAL(MethodInfo(sig_state_entered));
	ADD_SIGNAL(MethodInfo(sig_state_exited));
}

void CharacterState::_notification(int what) {
	if (Engine::get_singleton()->is_editor_hint()) {
		return;
	}
	switch (what) {
		default:
			return;
		case NOTIFICATION_ENTER_TREE:
			// turn these off just in case
			set_process(false);
			set_physics_process(false);
			set_process_input(false);
			set_process_unhandled_input(false);
			Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_CAPTURED);
			return;
	}
}

void CharacterState::switch_state(NodePath path) {
	this->set_state_active(false);
	stack_state(path);
}

void CharacterState::stack_state(NodePath path) {
	if (CharacterState * new_state{ cast_to<CharacterState>(get_node(path)) }) {
		new_state->set_state_active(true);
	}
}

void CharacterState::state_entered() {}

void CharacterState::state_exited() {}

void CharacterState::set_state_active(bool active) {
	if (active != this->active_state) {
		if (active) {
			state_entered();
			emit_signal(sig_state_entered);
		} else {
			state_exited();
			emit_signal(sig_state_exited);
		}
	}
	this->active_state = active;
}