#define SDL_MAIN_HANDLED

#include "application.h"
#include "input.h"
#include "resources.h"
#include <SDL3/SDL.h>
#include <SDL3/SDL_error.h>
#include <SDL3/SDL_events.h>
#include <SDL3/SDL_hints.h>
#include <SDL3/SDL_init.h>
#include <SDL3/SDL_keycode.h>
#include <SDL3/SDL_log.h>
#include <SDL3/SDL_mouse.h>
#include <SDL3/SDL_render.h>
#include <SDL3/SDL_video.h>
#include <SDL3_ttf/SDL_ttf.h>
#include <clay/clay.h>
#include <renderer/clay_renderer_SDL3.h>
#include <renderer/ui_data.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>

constexpr SDL_InitFlags sdlInitFlags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIGH_PIXEL_DENSITY;

SDL_Window *window = nullptr;
SDL_Renderer *renderer = nullptr;
int screenWidth = 1920, screenHeight = 1080;
bool running = true;
uint64_t clayMemorySize = 0;

Clay_Arena clayPrimaryArena;

Clay_SDL3RendererData backendData = {
	nullptr, nullptr, nullptr
};

static
Clay_Dimensions MeasureText(Clay_StringSlice text, Clay_TextElementConfig *config, void *userData) {
	TTF_Font **fonts = (TTF_Font**)userData;
	TTF_Font *font = fonts[config->fontId];
	int width, height;
	TTF_SetFontSize(font, config->fontSize);
	if (!TTF_GetStringSize(font, text.chars, text.length, &width, &height)) {
		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "MeasureText failed to measure text %s", SDL_GetError());
	}
	return (Clay_Dimensions) { (float)width, (float)height };
}

static
void HandleClayErrors(Clay_ErrorData data) {
	SDL_LogError(SDL_LOG_CATEGORY_ERROR, "%s", data.errorText.chars);
}

static inline
void LogOutputResolution() {
	int w, h;
	SDL_GetCurrentRenderOutputSize(renderer, &w, &h);
	SDL_Log("output size: %i, %d", w, h);
}

static inline
void InitSDL() {
	SDL_SetHint(SDL_HINT_RENDER_LINE_METHOD, "3");
	if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS)) {
		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "SDL_Init failed: %s", SDL_GetError());
		exit(1);
	}
	if ((window = SDL_CreateWindow("Window", screenWidth, screenHeight, sdlInitFlags)) == nullptr) {
		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "SDL_CreateWindow failed: %s", SDL_GetError());
		exit(2);
	}
	if ((renderer = SDL_CreateRenderer(window, NULL)) == nullptr) {
		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "SDL_CreateRenderer failed: %s", SDL_GetError());
		exit(3);
	}
	if (!TTF_Init()) {
		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "TTF_Init failed: %s", SDL_GetError());
		exit(4);
	}
	if ((resources::textEngine = TTF_CreateRendererTextEngine(renderer)) == nullptr) {
		SDL_LogError(SDL_LOG_CATEGORY_ERROR, "TTF_CreateRendererTextEngine failed: %s", SDL_GetError());
		exit(5);
	}
}

static
void InitClay() {
	clayMemorySize = Clay_MinMemorySize();
	clayPrimaryArena = Clay_CreateArenaWithCapacityAndMemory(clayMemorySize, SDL_malloc(clayMemorySize));
	Clay_Initialize(clayPrimaryArena, { (float)screenWidth, (float)screenHeight }, { HandleClayErrors });
	Clay_SetMeasureTextFunction(MeasureText, resources::fonts);
	Clay_SetLayoutDimensions({ (float)screenWidth, (float)screenHeight });
	float x{ 0 }, y{ 0 };
	SDL_GetMouseState(&x, &y);
	Clay_SetPointerState((Clay_Vector2) { x, y }, false);
}

int main(int argc, char *argv[]) {
	InitSDL();
	resources::LoadResources();
	LogOutputResolution();
	InitClay();
	backendData = { renderer, resources::textEngine, resources::fonts };
	SDL_Event event;
	uint64_t startFrameTime = SDL_GetTicksNS();
	double deltaTime = 0.0;
	while (running) {
		std::srand(SDL_GetTicksNS());
		deltaTime = SDL_GetTicksNS() - startFrameTime;
		startFrameTime = SDL_GetTicksNS();
		UiData_Clear();
		input::FrameStart();
		while (SDL_PollEvent(&event)) {
			application::HandleEvent(event);
			input::HandleEvent(event);
			switch (event.type) {
				case SDL_EVENT_QUIT:
					running = false;
					break;
				case SDL_EVENT_WINDOW_RESIZED:
					Clay_SetLayoutDimensions({
						(float)event.window.data1,
						(float)event.window.data2
					});
					LogOutputResolution();
					break;
				default: break;
			}
		}
		Clay_UpdateScrollContainers(true, input::scrollMotion, deltaTime);
		SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
		SDL_RenderClear(renderer);
		Clay_RenderCommandArray commands{ application::RenderApplication() };
		SDL_Clay_RenderClayCommands(&backendData, &commands);
		SDL_RenderPresent(renderer);
		SDL_Delay(10);
	}
	SDL_DestroyRenderer(renderer);
	SDL_DestroyWindow(window);
	SDL_Quit();
	return 0;
}