#include <string.h>
#include <stdio.h>

#include "world.cpp"

Texture SpaceshipFusilageTexture;

Texture SpaceshipEnginesTexture;

Texture AsteroidTexture;

void LoadAssets() {
	SpaceshipFusilageTexture = LoadTexture("./spaceshipFusilage.png");
	SpaceshipEnginesTexture = LoadTexture("./spaceshipEngines.png");
}

int main(int argc, char const** argv) {
	int const viewportWidth = 640;
	int const viewportHeight = 360;
	Vector2 const viewportOrigin = Vector2{(viewportWidth / 2), (viewportHeight / 2)};
	int unsigned const windowFlags = 0;
	int unsigned const rendererFlags = 0;

	InitWindow(viewportWidth, viewportHeight, "Quadrants");
	HideCursor();
	LoadAssets();

	Texture nebulaTexture = LoadTexture("./nebula.png");
	Texture sunTexture = LoadTexture("./sun.png");
	Texture moonTexture = LoadTexture("./moon.png");
	Texture asteroidTexture = LoadTexture("./asteroid01.png");
	Worldspace world = CreateWorldspace(10);
	Camera2D camera = {0};
	camera.target = viewportOrigin;
	camera.zoom = 1.0f;

	GenerateWorldspace(world);
	SetTargetFPS(60);

	while (!WindowShouldClose()) {
		float const scale = (1.0f + (1.0f - camera.zoom));
		Vector2 const mousePos = GetMousePosition();
		int const mouseWheel = GetMouseWheelMove();
		float const lookAtEngageDistance = 32.0f;
		float const accel = 0.005f;

		// Relative position checks.
		if (Vector2Distance(mousePos, viewportOrigin) > lookAtEngageDistance) {
			float const lerpStep =
					AngleDifference(world.player.entity.orientation, AngleToPoint(viewportOrigin, mousePos));

			world.player.delayedOrientation = WrapAngle(world.player.entity.orientation + (lerpStep * 0.0005f));
			world.player.entity.orientation = WrapAngle(world.player.entity.orientation + (lerpStep * 0.2f));
		}

		if (IsKeyDown(KEY_W)) {
			AddEntityForce(world.player.entity, world.player.entity.orientation, accel);
		}

		if (IsKeyDown(KEY_A)) {
			AddEntityForce(world.player.entity, (world.player.entity.orientation - HALF_PI), accel);
		}

		if (IsKeyDown(KEY_S)) {
			AddEntityForce(world.player.entity, (world.player.entity.orientation + PI), accel);
		}

		if (IsKeyDown(KEY_D)) {
			AddEntityForce(world.player.entity, (world.player.entity.orientation + HALF_PI), accel);
		}

		if (IsKeyDown(KEY_SPACE)) {
			RemoveEntityForce(world.player.entity, accel);
		}

		camera.target = Vector2{-mousePos.x, -mousePos.y};

		if (mouseWheel) {
			camera.zoom = CLAMP(camera.zoom - (((float)mouseWheel) * 0.05f), 0.5f, 1.5f);
		}

		EntityUpdateInfo const updateInfo = UpdateEntity(world.player.entity);

		if (updateInfo.hasMoved) {
			Vector2 const nebulaParallaxIncrement = (world.nebulaParallaxScroll + (world.player.entity.speed * 0.005f));
			world.nebulaParallaxScroll.x = wrap(nebulaParallaxIncrement.x, 0.0f, ((float)nebulaTexture.width));
			world.nebulaParallaxScroll.y = wrap(nebulaParallaxIncrement.y, 0.0f, ((float)nebulaTexture.height));

			if (updateInfo.hasPassedQuadrant) {
				GenerateWorldspace(world);
			}
		}

		BeginDrawing();
		{
			ClearBackground(BLACK);
			BeginMode2D(camera);
			{
				Vector2 const quadrantOffsets[] = {
					{-QUADRANT_SIZE, -QUADRANT_SIZE},
					{0.0f, -QUADRANT_SIZE},
					{QUADRANT_SIZE, -QUADRANT_SIZE},
					{-QUADRANT_SIZE, 0.0f},
					{0.0f, 0.0f},
					{QUADRANT_SIZE, 0.0f},
					{-QUADRANT_SIZE, QUADRANT_SIZE},
					{0.0f, QUADRANT_SIZE},
					{QUADRANT_SIZE, QUADRANT_SIZE}
				};

				// DrawTextureQuad(nebulaTexture, Vector2{1, 1}, world.nebulaParallaxScroll, Rectangle{0, 0, viewportWidth, viewportHeight}, RED);

				for (size_t i = 0; i < 9; i += 1) {
					Worldspace::Quadrant const* quadrant = (&world.loadedQuadrantMap[i]);
					Vector2 const quadrantOffset = (viewportOrigin + quadrantOffsets[i]);

					for (size_t j = 0; j < quadrant->starCount; j += 1) {
						DrawCircleV(((quadrantOffset + quadrant->stars[j]) - world.player.entity.localPosition), 1.0f, WHITE);
					}

					for (size_t j = 0; j < quadrant->orbitalCount; j += 1) {
						Worldspace::Orbital const quadrantOrbital = quadrant->orbitals[j];

						DrawTextureEx(
							asteroidTexture,
							((quadrantOffset + quadrantOrbital.localPosition) - world.player.entity.localPosition),
							(quadrantOrbital.orientation * RAD2DEG),
							quadrantOrbital.scale,
							WHITE
						);
					}
				}

				// Draw player.
				DrawTexturePro(
					SpaceshipEnginesTexture,
					(Rectangle){0, 0, ((float)SpaceshipEnginesTexture.width), ((float)SpaceshipEnginesTexture.height)},
					(Rectangle){viewportOrigin.x, viewportOrigin.y, ((float)SpaceshipEnginesTexture.width), ((float)SpaceshipEnginesTexture.height)},
					(Vector2){(float)(SpaceshipEnginesTexture.width / 2), (float)(SpaceshipEnginesTexture.height / 2)},
					(world.player.delayedOrientation * RAD2DEG),
					WHITE
				);

				DrawTexturePro(
					SpaceshipFusilageTexture,
					(Rectangle){0, 0, (float)(SpaceshipFusilageTexture.width), (float)(SpaceshipFusilageTexture.height)},
					(Rectangle){viewportOrigin.x, viewportOrigin.y, ((float)SpaceshipFusilageTexture.width), ((float)SpaceshipFusilageTexture.height)},
					(Vector2){(float)(SpaceshipFusilageTexture.width / 2), (float)(SpaceshipFusilageTexture.height / 2)},
					(world.player.entity.orientation * RAD2DEG),
					WHITE
				);
			}
			EndMode2D();
			// Draw UI.
			DrawCircleLines(((int)mousePos.x), ((int)mousePos.y), 10.0f, WHITE);
			DrawText(TextFormat("Scale: %f", scale), 0, 0, 22, WHITE);
		}
		EndDrawing();
	}

	CloseWindow();

	return 0;
}