// Copyright 2020 - 2025, project-repo and the NEDM contributors
// SPDX-License-Identifier: MIT

#include <cairo.h>
#include <cairo/cairo.h>
#include <pango/pangocairo.h>
#include <stdarg.h>
#include <stdio.h>
#include <wlr/util/log.h>

char *
lenient_strcat(char *dest, const char *src) {
	if(dest && src) {
		return strcat(dest, src);
	}
	return dest;
}

PangoLayout *
get_pango_layout(cairo_t *cairo, const char *font, const char *text,
                 double scale) {
	PangoLayout *layout = pango_cairo_create_layout(cairo);
	PangoAttrList *attrs;

	attrs = pango_attr_list_new();
	pango_layout_set_text(layout, text, -1);

	pango_attr_list_insert(attrs, pango_attr_scale_new(scale));
	PangoFontDescription *desc = pango_font_description_from_string(font);
	pango_layout_set_font_description(layout, desc);
	pango_layout_set_single_paragraph_mode(layout, false);
	pango_layout_set_attributes(layout, attrs);
	pango_attr_list_unref(attrs);
	pango_font_description_free(desc);
	return layout;
}

void
get_text_size(cairo_t *cairo, const char *font, int *width, int *height,
              int *baseline, double scale, const char *fmt, ...) {
	va_list args;
	va_start(args, fmt);
	// Add one since vsnprintf excludes null terminator.
	int length = vsnprintf(NULL, 0, fmt, args) + 1;
	va_end(args);

	char *buf = malloc(length);
	if(buf == NULL) {
		wlr_log(WLR_ERROR, "Failed to allocate memory");
		return;
	}
	va_start(args, fmt);
	vsnprintf(buf, length, fmt, args);
	va_end(args);

	PangoLayout *layout = get_pango_layout(cairo, font, buf, scale);
	pango_cairo_update_layout(cairo, layout);
	pango_layout_get_pixel_size(layout, width, height);
	if(baseline) {
		*baseline = pango_layout_get_baseline(layout) / PANGO_SCALE;
	}
	g_object_unref(layout);
	free(buf);
}

void
pango_printf(cairo_t *cairo, const char *font, double scale, const char *fmt,
             ...) {
	va_list args;
	va_start(args, fmt);
	// Add one since vsnprintf excludes null terminator.
	int length = vsnprintf(NULL, 0, fmt, args) + 1;
	va_end(args);

	char *buf = malloc(length);
	if(buf == NULL) {
		wlr_log(WLR_ERROR, "Failed to allocate memory");
		return;
	}
	va_start(args, fmt);
	vsnprintf(buf, length, fmt, args);
	va_end(args);

	PangoLayout *layout = get_pango_layout(cairo, font, buf, scale);
	cairo_font_options_t *fo = cairo_font_options_create();
	cairo_get_font_options(cairo, fo);
	pango_cairo_context_set_font_options(pango_layout_get_context(layout), fo);
	cairo_font_options_destroy(fo);
	pango_cairo_update_layout(cairo, layout);
	pango_cairo_show_layout(cairo, layout);
	g_object_unref(layout);
	free(buf);
}
