#include "Game.h"
#include "AnimatedModel.h"
#include "BoneAnimatedModel.h"
#include "utils/Utils.h"
#include "render/OpenGlExtensions.h"
#include <iostream>
#include "render/TextureManager.h"
#include "TextModel.h"
#include <random>
#include <cmath>
#include <algorithm>
#include <functional>
#ifdef __ANDROID__
#include <android/log.h>
#endif



#ifdef EMSCRIPTEN
#include <emscripten.h>
#endif

#include "GameConstants.h"

namespace ZL
{
#ifdef EMSCRIPTEN
	const char* CONST_ZIP_FILE = "resources.zip";
#else
	const char* CONST_ZIP_FILE = "";
#endif

	float x = 0;
	float y = 0;
	float z = 0;

#ifdef EMSCRIPTEN
	Game* Game::s_instance = nullptr;

	void Game::onResourcesZipLoaded(const char* /*filename*/) {
		std::cout << "Resources.zip loaded successfully" << std::endl;
		if (s_instance) {
			s_instance->mainThreadHandler.EnqueueMainThreadTask([&]() {
				s_instance->setupPart2();
			});
		}
	}

	void Game::onResourcesZipError(const char* /*filename*/) {
		std::cout << "Failed to download resources.zip" << std::endl;
	}
#endif

	Game::Game()
		: newTickCount(0)
		, lastTickCount(0)
		, menuManager(renderer)
	{
	}

	Game::~Game() {
#ifndef EMSCRIPTEN
		// In Emscripten, SDL must stay alive across context loss/restore cycles
		// so the window remains valid when the game object is re-created.
		SDL_Quit();
#endif
	}

	void Game::setup() {
		Environment::width = Environment::CONST_DEFAULT_WIDTH;
		Environment::height = Environment::CONST_DEFAULT_HEIGHT;
		Environment::computeProjectionDimensions();

		ZL::BindOpenGlFunctions();
		ZL::CheckGlError(__FILE__, __LINE__);
		renderer.InitOpenGL();
		
#ifdef EMSCRIPTEN
		// These shaders and loading.png are preloaded separately (not from zip),
		// so they are available immediately without waiting for resources.zip.
		renderer.shaderManager.AddShaderFromFiles("defaultColor", "resources/shaders/defaultColor.vertex", "resources/shaders/defaultColor_web.fragment", "");
		renderer.shaderManager.AddShaderFromFiles("default", "resources/shaders/default.vertex", "resources/shaders/default_web.fragment", "");
#else
		renderer.shaderManager.AddShaderFromFiles("defaultColor", "resources/shaders/defaultColor.vertex", "resources/shaders/defaultColor_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("default", "resources/shaders/default.vertex", "resources/shaders/default_desktop.fragment", CONST_ZIP_FILE);
#endif
		loadingTexture = std::make_unique<Texture>(CreateTextureDataFromPng("resources/loading.png", ""));

		float minDimension;
		float width = Environment::projectionWidth;
		float height = Environment::projectionHeight;

		if (width >= height)
		{
			minDimension = height;
		}
		else
		{
			minDimension = width;
		}

		loadingMesh.data = CreateRect2D({ 0.0f, 0.0f }, { minDimension*0.5f, minDimension*0.5f }, 3);
		loadingMesh.RefreshVBO();
		
#ifdef EMSCRIPTEN
		// Asynchronously download resources.zip; setupPart2() is called on completion.
		// The loading screen stays visible until the download finishes.
		s_instance = this;
		std::cout << "Load resurces step 1" << std::endl;
		emscripten_async_wget("resources.zip", "resources.zip", onResourcesZipLoaded, onResourcesZipError);
#else
		mainThreadHandler.EnqueueMainThreadTask([this]() {
			std::cout << "Load resurces step 2" << std::endl;
			this->setupPart2();
			std::cout << "Load resurces step 3" << std::endl;
		});
#endif

	}


	void Game::setupPart2()
	{

#ifdef EMSCRIPTEN
		renderer.shaderManager.AddShaderFromFiles("env_sky", "resources/shaders/env_sky.vertex", "resources/shaders/env_sky_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("defaultAtmosphere", "resources/shaders/defaultAtmosphere.vertex", "resources/shaders/defaultAtmosphere_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("planetBake", "resources/shaders/planet_bake.vertex", "resources/shaders/planet_bake_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("planetStone", "resources/shaders/planet_stone.vertex", "resources/shaders/planet_stone_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("planetLand", "resources/shaders/planet_land.vertex", "resources/shaders/planet_land_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("spark", "resources/shaders/spark.vertex", "resources/shaders/spark_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("skinning", "resources/shaders/skinning.vertex", "resources/shaders/default_web.fragment", CONST_ZIP_FILE);

#else
		renderer.shaderManager.AddShaderFromFiles("env_sky", "resources/shaders/env_sky.vertex", "resources/shaders/env_sky_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("defaultAtmosphere", "resources/shaders/defaultAtmosphere.vertex", "resources/shaders/defaultAtmosphere_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("planetBake", "resources/shaders/planet_bake.vertex", "resources/shaders/planet_bake_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("planetStone", "resources/shaders/planet_stone.vertex", "resources/shaders/planet_stone_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("planetLand", "resources/shaders/planet_land.vertex", "resources/shaders/planet_land_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("spark", "resources/shaders/spark.vertex", "resources/shaders/spark_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("skinning", "resources/shaders/skinning.vertex", "resources/shaders/default_desktop.fragment", CONST_ZIP_FILE);
#endif

		std::cout << "Load resurces step 4" << std::endl;

		currentLocation = std::make_unique<Location>(renderer, inventory);

		currentLocation->setup();
	
		std::cout << "Load resurces step 5" << std::endl;
		
		std::cout << "Load resurces step 12" << std::endl;

		// Shadow mapping shaders
#ifdef EMSCRIPTEN
		renderer.shaderManager.AddShaderFromFiles("shadow_depth", "resources/shaders/shadow_depth.vertex", "resources/shaders/shadow_depth_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("shadow_depth_skinning", "resources/shaders/shadow_depth_skinning.vertex", "resources/shaders/shadow_depth_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("default_shadow", "resources/shaders/default_shadow.vertex", "resources/shaders/default_shadow_web.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("skinning_shadow", "resources/shaders/skinning_shadow.vertex", "resources/shaders/default_shadow_web.fragment", CONST_ZIP_FILE);
#else
		renderer.shaderManager.AddShaderFromFiles("shadow_depth", "resources/shaders/shadow_depth.vertex", "resources/shaders/shadow_depth_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("shadow_depth_skinning", "resources/shaders/shadow_depth_skinning.vertex", "resources/shaders/shadow_depth_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("default_shadow", "resources/shaders/default_shadow.vertex", "resources/shaders/default_shadow_desktop.fragment", CONST_ZIP_FILE);
		renderer.shaderManager.AddShaderFromFiles("skinning_shadow", "resources/shaders/skinning_shadow.vertex", "resources/shaders/default_shadow_desktop.fragment", CONST_ZIP_FILE);
#endif

	
		std::cout << "Load resurces step 13" << std::endl;

		// Load UI with inventory button
		try {
			menuManager.uiManager.loadFromFile("resources/config2/ui_inventory.json", renderer, CONST_ZIP_FILE);
			std::cout << "UI loaded successfully" << std::endl;

			menuManager.uiManager.setNodeVisible("inventory_items_panel", false);
			menuManager.uiManager.setNodeVisible("close_inventory_button", false);

			menuManager.uiManager.setTextButtonCallback("inventory_button", [this](const std::string& name) {
				std::cout << "[UI] Inventory button clicked" << std::endl;
				this->menuManager.uiManager.setNodeVisible("inventory_items_panel", true);
				this->menuManager.uiManager.setNodeVisible("close_inventory_button", true);
				this->inventoryOpen = true;

				// Update UI with current items
				const auto& items = this->inventory.getItems();
				std::string itemText;

				if (items.empty()) {
					itemText = "Inventory (Empty)";
				}
				else {
					itemText = "Inventory (" + std::to_string(items.size()) + " items)\n\n";
					for (size_t i = 0; i < items.size(); ++i) {
						itemText += std::to_string(i + 1) + ". " + items[i].name + "\n";
					}
				}

				this->menuManager.uiManager.setText("inventory_items_text", itemText);
			});

			menuManager.uiManager.setTextButtonCallback("close_inventory_button", [this](const std::string& name) {
				std::cout << "[UI] Close button clicked" << std::endl;
				menuManager.uiManager.setNodeVisible("inventory_items_panel", false);
				menuManager.uiManager.setNodeVisible("close_inventory_button", false);
				inventoryOpen = false;
			});
		}
		catch (const std::exception& e) {
			std::cerr << "Failed to load UI: " << e.what() << std::endl;
		}

		loadingCompleted = true;

	}
	
	void Game::drawUI()
	{
		glClear(GL_DEPTH_BUFFER_BIT);

		glDisable(GL_DEPTH_TEST);
		glDepthMask(GL_FALSE);

		renderer.shaderManager.PushShader(defaultShaderName);
		renderer.RenderUniform1i(textureUniformName, 0);
		glEnable(GL_BLEND);

		menuManager.uiManager.draw(renderer);
		if (currentLocation)
		{
			currentLocation->dialogueSystem.draw(renderer);
		}

		glDisable(GL_BLEND);
		renderer.shaderManager.PopShader();

		glDepthMask(GL_TRUE);
		glEnable(GL_DEPTH_TEST);

		CheckGlError(__FILE__, __LINE__);
	}
	
	void Game::drawScene() {
		glViewport(0, 0, Environment::width, Environment::height);
		if (!loadingCompleted) {
			drawLoading();
		}
		else
		{
			if (currentLocation)
			{
				if (currentLocation->shadowMap) {
					CheckGlError(__FILE__, __LINE__);
					currentLocation->drawShadowDepthPass();
					CheckGlError(__FILE__, __LINE__);
					currentLocation->drawGameWithShadows();
					CheckGlError(__FILE__, __LINE__);
				}
				else {
					currentLocation->drawGame();
					CheckGlError(__FILE__, __LINE__);
				}
			}
			else
			{
				// ??? Main menu???
			}
			drawUI();
		}
		CheckGlError(__FILE__, __LINE__);
	}

	void Game::drawLoading()
	{
		glClear(GL_DEPTH_BUFFER_BIT);

		renderer.shaderManager.PushShader(defaultShaderName);
		renderer.RenderUniform1i(textureUniformName, 0);

		float width = Environment::projectionWidth;
		float height = Environment::projectionHeight;

		renderer.PushProjectionMatrix(
			-width * 0.5f, width*0.5f,
			-height * 0.5f, height * 0.5f,
			-10, 10);

		renderer.PushMatrix();
		renderer.LoadIdentity();

		glBindTexture(GL_TEXTURE_2D, loadingTexture->getTexID());
		renderer.DrawVertexRenderStruct(loadingMesh);

		renderer.PopMatrix();
		renderer.PopProjectionMatrix();
		renderer.shaderManager.PopShader();
		CheckGlError(__FILE__, __LINE__);
	}

	
	int64_t Game::getSyncTimeMs() {
		int64_t localNow = std::chrono::duration_cast<std::chrono::milliseconds>(
			std::chrono::system_clock::now().time_since_epoch()).count();
		return localNow;
	}
	

	void Game::processTickCount() {

		if (lastTickCount == 0) {
			lastTickCount = getSyncTimeMs();

			lastTickCount = (lastTickCount / 50) * 50;

			return;
		}

		newTickCount = getSyncTimeMs();

		newTickCount = (newTickCount / 50) * 50;

		if (newTickCount - lastTickCount > CONST_TIMER_INTERVAL) {

			int64_t delta = newTickCount - lastTickCount;

			lastTickCount = newTickCount;

			if (currentLocation)
			{
				currentLocation->update(delta);
			}

		}
	}

	void Game::render() {
		ZL::CheckGlError(__FILE__, __LINE__);

		glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		drawScene();
		processTickCount();

		SDL_GL_SwapWindow(ZL::Environment::window);
	}

	void Game::update() {
		SDL_Event event;
		while (SDL_PollEvent(&event)) {
			if (event.type == SDL_QUIT) {
				Environment::exitGameLoop = true;
			}

			
			if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_RESIZED) {
				// Обновляем размеры и сбрасываем кеш текстов, т.к. меши хранятся в пикселях
				Environment::width = event.window.data1;
				Environment::height = event.window.data2;
				Environment::computeProjectionDimensions();
				//menuManager.uiManager.updateAllLayouts();
				std::cout << "Window resized: " << Environment::width << "x" << Environment::height << std::endl;

				//space.clearTextRendererCache();
			}

#ifdef __ANDROID__
			if (event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_AC_BACK) {
				Environment::exitGameLoop = true;
			}
#endif

#ifdef __ANDROID__
			if (event.type == SDL_FINGERDOWN) {
				int mx = static_cast<int>(event.tfinger.x * Environment::projectionWidth);
				int my = static_cast<int>(event.tfinger.y * Environment::projectionHeight);
				handleDown(static_cast<int64_t>(event.tfinger.fingerId), mx, my);
			}
			else if (event.type == SDL_FINGERUP) {
				int mx = static_cast<int>(event.tfinger.x * Environment::projectionWidth);
				int my = static_cast<int>(event.tfinger.y * Environment::projectionHeight);
				handleUp(static_cast<int64_t>(event.tfinger.fingerId), mx, my);
			}
			else if (event.type == SDL_FINGERMOTION) {
				int mx = static_cast<int>(event.tfinger.x * Environment::projectionWidth);
				int my = static_cast<int>(event.tfinger.y * Environment::projectionHeight);
				handleMotion(static_cast<int64_t>(event.tfinger.fingerId), mx, my);
			}
#else
			// Emscripten on mobile browser: handle real touch events with per-finger IDs.
			// SDL_HINT_TOUCH_MOUSE_EVENTS="0" is set in main.cpp so these don't
			// also fire SDL_MOUSEBUTTONDOWN, preventing double-processing.
#ifdef EMSCRIPTEN
			if (event.type == SDL_FINGERDOWN) {
				int mx = static_cast<int>(event.tfinger.x * Environment::projectionWidth);
				int my = static_cast<int>(event.tfinger.y * Environment::projectionHeight);
				handleDown(static_cast<int64_t>(event.tfinger.fingerId), mx, my);
			}
			else if (event.type == SDL_FINGERUP) {
				int mx = static_cast<int>(event.tfinger.x * Environment::projectionWidth);
				int my = static_cast<int>(event.tfinger.y * Environment::projectionHeight);
				handleUp(static_cast<int64_t>(event.tfinger.fingerId), mx, my);
			}
			else if (event.type == SDL_FINGERMOTION) {
				int mx = static_cast<int>(event.tfinger.x * Environment::projectionWidth);
				int my = static_cast<int>(event.tfinger.y * Environment::projectionHeight);
				handleMotion(static_cast<int64_t>(event.tfinger.fingerId), mx, my);
			}
#endif

			if (event.type == SDL_MOUSEBUTTONDOWN || event.type == SDL_MOUSEBUTTONUP) {
				if (event.button.button == SDL_BUTTON_LEFT) {
					int mx = static_cast<int>((float)event.button.x / Environment::width * Environment::projectionWidth);
					int my = static_cast<int>((float)event.button.y / Environment::height * Environment::projectionHeight);
					
					if (event.type == SDL_MOUSEBUTTONDOWN) {
						std::cout << "\n========== MOUSE DOWN EVENT ==========" << std::endl;
						handleDown(ZL::UiManager::MOUSE_FINGER_ID, mx, my);

						if (menuManager.uiManager.isUiInteractionForFinger(ZL::UiManager::MOUSE_FINGER_ID)) {
							std::cout << "[CLICK] UI handled, skipping character movement" << std::endl;
							continue;
						}

						if (currentLocation)
						{
							currentLocation->handleDown(ZL::UiManager::MOUSE_FINGER_ID, event.button.x, event.button.y, mx, my);
						}
						///.....
					} else {
						handleUp(ZL::UiManager::MOUSE_FINGER_ID, mx, my);
					}
				}
				else if (event.button.button == SDL_BUTTON_RIGHT) {
					if (event.type == SDL_MOUSEBUTTONDOWN) {
						rightMouseDown = true;
						lastMouseX = event.button.x;
						lastMouseY = event.button.y;
						if (currentLocation)
						{
							currentLocation->rightMouseDown = true;
							currentLocation->lastMouseX = event.button.x;
							currentLocation->lastMouseY = event.button.y;
						}
					}
					else {
						rightMouseDown = false;
						if (currentLocation)
						{
							currentLocation->rightMouseDown = false;
						}
					}
				}
			}
			else if (event.type == SDL_MOUSEMOTION) {
				int mx = static_cast<int>((float)event.motion.x / Environment::width * Environment::projectionWidth);
				int my = static_cast<int>((float)event.motion.y / Environment::height * Environment::projectionHeight);
				handleMotion(ZL::UiManager::MOUSE_FINGER_ID, mx, my);
				if (currentLocation)
				{
					currentLocation->handleMotion(ZL::UiManager::MOUSE_FINGER_ID, event.motion.x, event.motion.y, mx, my);
				}	
			}

			if (event.type == SDL_MOUSEWHEEL) {
				static const float zoomstep = 2.0f;
				if (event.wheel.y > 0) {
					Environment::zoom -= zoomstep;
				}
				else if (event.wheel.y < 0) {
					Environment::zoom += zoomstep;
				}
				if (Environment::zoom < zoomstep) {
					Environment::zoom = zoomstep;
				}
			}


			if (event.type == SDL_KEYDOWN) {
				if (currentLocation && currentLocation->dialogueSystem.handleKeyDown(event.key.keysym.sym))
				{
					continue;
				}
			}

			if (event.type == SDL_KEYDOWN && event.key.repeat == 0) {
				switch (event.key.keysym.sym) {
				case SDLK_f:
					currentLocation->dialogueSystem.startDialogue("test_choice_dialogue");
					break;

				case SDLK_e:
					currentLocation->dialogueSystem.startDialogue("test_cutscene_pan_dialogue");
					break;

				case SDLK_p:
					break;

				case SDLK_l:
					break;
				case SDLK_RETURN:

				default:
					break;
				}
			}

			// Обработка ввода текста
			if (event.type == SDL_KEYDOWN) {
				if (event.key.keysym.sym == SDLK_BACKSPACE) {
					//menuManager.uiManager.onKeyBackspace();
				}
			}

			if (event.type == SDL_TEXTINPUT) {
				// Пропускаем ctrl+c и другие команды
				if ((event.text.text[0] & 0x80) == 0) { // ASCII символы
					//menuManager.uiManager.onKeyPress((unsigned char)event.text.text[0]);
				}
			}

			if (event.type == SDL_KEYUP) {
				if (event.key.keysym.sym == SDLK_r) {
					std::cout << "Camera position: x=" << x << " y=" << y << " z=" << z << std::endl;
				}
			}

			if (event.type == SDL_KEYUP) {

			}
#endif
		}
		render();
		
		mainThreadHandler.processMainThreadTasks();

	}

	void Game::handleDown(int64_t fingerId, int mx, int my)
	{
		int uiX = mx;
		int uiY = Environment::projectionHeight - my;

		
		menuManager.uiManager.onTouchDown(fingerId, uiX, uiY);

	}

	void Game::handleUp(int64_t fingerId, int mx, int my)
	{
		int uiX = mx;
		int uiY = Environment::projectionHeight - my;

		// Check BEFORE onTouchUp erases the finger from the map.
		// If this finger started on a UI element, don't notify space —
		// otherwise space would think the ship-control finger was released.
		bool wasUiInteraction = menuManager.uiManager.isUiInteractionForFinger(fingerId);
		menuManager.uiManager.onTouchUp(fingerId, uiX, uiY);

	}

	void Game::handleMotion(int64_t fingerId, int mx, int my)
	{
		int uiX = mx;
		int uiY = Environment::projectionHeight - my;

		// Check before onTouchMove so the "started on UI" state is preserved
		// regardless of what onTouchMove does internally.
		bool wasUiInteraction = menuManager.uiManager.isUiInteractionForFinger(fingerId);
		menuManager.uiManager.onTouchMove(fingerId, uiX, uiY);

	}

}  // namespace ZL