#include "common.hpp"
#include <list>
#include <sstream>

static sf::RectangleShape wot_rect;
static sf::Font font;

static void draw_tile(sf::RenderWindow *window, v2f_t x, world::tile_t *tile)
{
	render::tile_t *tile_assets;
	sf::Texture *texture;
	bool mirror;

	switch (tile->type) {
	default:
		return;

	case world::TILE_DIRT:
		tile_assets = &assets::tile_dirt;
		break;

	case world::TILE_WALL:
		tile_assets = &assets::tile_wall;
		break;
	}

	texture = tile_assets->get_texture(tile->neighbors, &mirror);

	wot_rect.setTexture(texture);
	wot_rect.setSize(sf::Vector2f(1.0f, 1.0f));
	if (!mirror) {
		wot_rect.setPosition(x);
		wot_rect.setScale(v2f_t(1, 1));
	} else {
		wot_rect.setPosition(x + v2f_t(1.0f, 0));
		wot_rect.setScale(v2f_t(-1, 1));
	}
	wot_rect.setFillColor(sf::Color::White);
	wot_rect.setOutlineColor(sf::Color::Transparent);
	window->draw(wot_rect);

	std::stringstream ss;
	ss << tile->type << ":" << tile->neighbors;
	sf::Text text(ss.str(), font, 20);
	text.setPosition(x);
	text.setScale(0.005, 0.005);
	window->draw(text);
}

static void draw_sector(sf::RenderWindow *window, world::sector_t *sector)
{
	for (ssize_t y = 0; y < SECTOR_SIZE; y++)
	for (ssize_t x = 0; x < SECTOR_SIZE; x++)
		draw_tile(window, sector->bounds.v[0] + v2f_t(x, y),
		          sector->tiles + y * SECTOR_SIZE + x);
}

void interface::state_t::render()
{
}

namespace render {

state_t::state_t(sf::RenderWindow *window_)
{
	window = window_;

	font.loadFromFile("assets/LiberationMono-Regular.ttf");
}

void state_t::begin_frame(double time_)
{
	now = time_;
	window->clear();
}

void state_t::end_frame(void)
{
	window->display();
}

void state_t::render(game::state_t *game)
{
	sf::Vector2u size = window->getSize();
	v2f_t A, B, C, D;
	rectf_t bbox;
	std::list<world::entity_t*> ents;

	A = window->mapPixelToCoords(sf::Vector2i(0, 0));
	B = window->mapPixelToCoords(sf::Vector2i(size.x, 0));
	C = window->mapPixelToCoords(sf::Vector2i(0, size.y));
	D = window->mapPixelToCoords(sf::Vector2i(size.x, size.y));

	bbox[0][0] = std::min({A[0], B[0], C[0], D[0]});
	bbox[0][1] = std::min({A[1], B[1], C[1], D[1]});
	bbox[1][0] = std::max({A[0], B[0], C[0], D[0]});
	bbox[1][1] = std::max({A[1], B[1], C[1], D[1]});

	for (world::sector_t *sector : game->world.get_sectors(bbox))
		draw_sector(window, sector);

	ents = game->world.get_render_entities(bbox);
	ents.sort(
		[](const world::entity_t *x, const world::entity_t *y) -> bool
		{ 
			return x->bounds[1][0] < y->bounds[1][0];
		});

	for (world::entity_t *ent : ents)
		ent->render_to(this);

	for (world::world_t::debug_t &debug : game->world.debug) {
		sf::Text text(debug.text, font, 20);
		text.setPosition(debug.x);
		text.setScale(0.006, 0.006);
		text.setColor(sf::Color::Red);
		window->draw(text);
	}
}

void state_t::render(animated_texture_t *anim, rectf_t bounds, bool mirror){
	size_t frame;

	if (!anim)
		return;

	if (!anim->frame_count)
		return;

	frame = floor(fmod(now * 20.0, anim->frame_count));

	wot_rect.setTexture(anim->frames + frame, true);
	wot_rect.setFillColor(sf::Color::White);

	if (!mirror) {
		wot_rect.setPosition(bounds[0]);
		wot_rect.setSize(bounds[1] - bounds[0]);
	} else {
		float dx = bounds[1][0] - bounds[0][0];
		wot_rect.setPosition(bounds[0] + v2f_t(dx, 0));
		wot_rect.setSize(bounds[1] - bounds[0]);
		wot_rect.setScale(v2f_t(-1, 1));
	}

	window->draw(wot_rect);
	wot_rect.setTexture(NULL);
	wot_rect.setScale(v2f_t(1, 1));
}

void state_t::render(oriented_sprite_t *sprite, rectf_t bounds, float angle)
{
	size_t index;
	bool mirror;

	index = sprite->select_index(angle, &mirror);
	render(sprite->textures + index, bounds, mirror);
}

void state_t::debug_path(std::list<v2f_t> *path)
{
	bool first = true;
	sf::Vertex line[2];

	for (v2f_t &point : *path) {
		line[1] = line[0];
		line[0] = sf::Vertex(point, sf::Color::Blue);

		if (first) {
			first = false;
			continue;
		}

		window->draw(line, 2, sf::Lines);
	}
}

animated_texture_t::~animated_texture_t(void)
{
	delete[] frames;
}

bool animated_texture_t::load(std::string prefix, size_t frame_count_)
{
	frame_count = frame_count_;
	frames = new sf::Texture[frame_count];

	for (size_t i = 0; i < frame_count; i++) {
		std::string path;

		path = prefix + std::to_string(i) + ".png";
		std::cout << "load " << path << "\n";

		if (!frames[i].loadFromFile(path)) {
			delete[] frames;
			frames = NULL;
			return false;
		}
	}

	return true;
}

oriented_sprite_t::~oriented_sprite_t(void)
{
	delete[] textures;
}

float normalize_angle(float angle)
{
	float t;

	t = angle / (2 * M_PI);
	t -= floor(t);

	return t * 2 * M_PI;
}

size_t oriented_sprite_4M_t::select_index(float angle, bool *mirror)
{
	angle = normalize_angle(angle);

	if (angle < 0.25f * M_PI) {
	select_x:
		*mirror = false;
		return 0;
	} else if (angle < 0.75f * M_PI) {
		*mirror = false;
		return 1;
	} else if (angle < 1.25f * M_PI) {
		*mirror = true;
		return 0;
	} else if (angle < 1.75f * M_PI) {
		*mirror = false;
		return 2;
	} else
		goto select_x;
}

void oriented_sprite_4M_t::load(std::string prefix, size_t xc, size_t yc, size_t nyc)
{
	textures = new animated_texture_t[3];

	textures[0].load(prefix + "_x_", xc);
	textures[1].load(prefix + "_y_", yc);
	textures[2].load(prefix + "_ny_", nyc);
}

size_t oriented_sprite_4M2_t::select_index(float angle, bool *mirror)
{
	angle = normalize_angle(angle);

	if (angle < 0.25f * M_PI) {
	select_x:
		*mirror = false;
		return 0;
	} else if (angle < 0.75f * M_PI) {
		*mirror = false;
		return 1;
	} else if (angle < 1.25f * M_PI) {
		*mirror = true;
		return 0;
	} else if (angle < 1.75f * M_PI) {
		*mirror = false;
		return 1;
	} else
		goto select_x;
}

void oriented_sprite_4M2_t::load(std::string prefix, size_t xc, size_t yc)
{
	textures = new animated_texture_t[2];

	textures[0].load(prefix + "_x_", xc);
	textures[1].load(prefix + "_y_", yc);
}

void tile_monotonic_t::load(std::string prefix)
{
	texture.loadFromFile(prefix + ".png");
}

void tile_connecting12_t::load(std::string prefix)
{
	for (size_t i = 0; i < 12; i++)
		textures[i].loadFromFile(prefix + "_" + std::to_string(i) + ".png");
}

sf::Texture *tile_monotonic_t::get_texture(int neighbors, bool *mirror)
{
	*mirror = false;
	return &texture;
}

sf::Texture *tile_connecting12_t::get_texture(int neighbors, bool *mirror)
{
	const static struct{ size_t index; bool mirror; } map[16] = {
		{0, false},
		{1, false},
		{2, false},
		{3, false},
		{1, true},
		{4, false},
		{3, true},
		{5, false},
		{6, false},
		{7, false},
		{8, false},
		{9, false},
		{7, true},
		{10, false},
		{9, true}
	};

	*mirror = map[neighbors].mirror;
	return textures + map[neighbors].index;
}

} // namespace render