#include <SDL3/SDL.h>
#include <stdio.h>
#include <stdlib.h>
#include <saffron.h>

void saffron_widget_init(SaffronWidget* widget) {
	/* This function is a generic primitive for initializing widgets. You wouldn't want to do this manually unless you're a lunatic. It is meant to be wrapped around by other functions that change the default parameters, for example, what sane person makes a widget 0x0x0x0? you LUNATIC! */
	widget->x = 0;
	widget->y = 0;
	widget->w = 0;
	widget->h = 0;

	widget->draw = NULL;
	widget->on_click = NULL;

	widget->parent = NULL;
	widget->children = NULL;
	widget->child_count = 0;

	widget->width_mode = SAFFRON_SIZE_FIXED;
	widget->height_mode = SAFFRON_SIZE_FIXED;
	widget->pixel_perfect = false;

	widget->type = SAFFRON_WIDGET_UNKNOWN;
}

SaffronWidget* saffron_widget_new(void) {
	/* also generic primitive, refer to above comment in saffron_widget_init */
	SaffronWidget* widget = malloc(sizeof(SaffronWidget));
	if (widget) {
		saffron_widget_init(widget);
	}

	return widget;
}

void saffron_widget_free(SaffronWidget *widget) {
	/* follow-up to my previous comment:
	 * yeah it is the caller's responsibility to check 
	 * for undefined behaviour but this one line will save
	 * so much time down the line */
	if (!widget) return;

	for (int i = 0; i < widget->child_count; i++) {
		saffron_widget_free(widget->children[i]);
	}

	free(widget->children);
	free(widget);
}

void saffron_widget_draw(SaffronWidget* widget, SDL_Renderer *renderer) {
	if (!widget) return;

	if (widget->draw) {
		widget->draw(widget, renderer);
	}

	for (int i = 0; i < widget->child_count; i++) {
		saffron_widget_draw(widget->children[i], renderer);
	}
}

void saffron_widget_add_child(SaffronWidget *parent, SaffronWidget *child) {
	child->parent = parent;
	parent->children = realloc(parent->children, sizeof(SaffronWidget*) * (parent->child_count + 1));
	parent->children[parent->child_count] = child;
	parent->child_count++;

	if (parent->type == SAFFRON_WIDGET_BOX) {
		saffron_box_layout((SaffronBox*)parent);
	}
}

SaffronWidget* saffron_widget_hit_test(SaffronWidget* widget, int x, int y) {
	if (!widget) {
		printf("[Saffron] hit test: widget is NULL!\n");
		return NULL;
	}
	if (x < widget->x || x > widget->x + widget->w) {
		printf("[Saffron] hit test: widget failed X bounds check!\n");
		return NULL;
	}
	if (y < widget->y || y > widget->y + widget->h) {
		printf("[Saffron] hit test: widget failed Y bounds check!\n");
		return NULL;
	}

	// check children front to back
	for (int i = widget->child_count - 1; i >= 0; i--) {
		printf("[Saffron] recursing to child (%i)\n", i);
		SaffronWidget* hit = saffron_widget_hit_test(widget->children[i], x, y);
		if (hit) return hit;
	}

	return widget;
}