#include <arpa/inet.h>
#include <cairo/cairo.h>
#include <glib.h>
#include <pango/pangocairo.h>
#include <pango/pango.h>
#include <wchar.h>
#include "client.h"
#include "entry.h"
#include "log.h"
#include "nelem.h"

#ifndef TWO_PI
#define TWO_PI 6.283185307179586f
#endif

void entry_preload(void)
{
	cairo_surface_t *surface = cairo_image_surface_create(
			CAIRO_FORMAT_ARGB32,
			10,
			10
			);
	cairo_t *cr = cairo_create(surface);

	PangoContext *context = pango_cairo_create_context(cr);
	PangoLayout *layout = pango_layout_new(context);
	pango_layout_set_text(layout, "test", -1);
	pango_cairo_update_layout(cr, layout);
	pango_cairo_show_layout(cr, layout);
	g_object_unref(layout);
	g_object_unref(context);
	cairo_destroy(cr);
	cairo_surface_destroy(surface);
}

void entry_init(struct entry *entry, uint32_t scale)
{
	/* Calculate the size of the entry from our font and various widths. */
	//calculate_font_extents(entry, scale);
	entry->text_bounds.width = 500;
	entry->text_bounds.height = 800;

	entry->surface.width = entry->text_bounds.width;
	entry->surface.height = entry->text_bounds.height;
	entry->surface.width += 2 * (
			entry->border.width
			+ 2 * entry->border.outline_width
			+ entry->padding
		     );
	entry->surface.height += 2 * (
			entry->border.width
			+ 2 * entry->border.outline_width
			+ entry->padding
		     );
	entry->surface.width *= scale;
	entry->surface.height *= scale;


	/*
	 * Cairo uses native 32 bit integers for pixels, so if this processor
	 * is little endian we have to tell OpenGL to swizzle the texture.
	 */
	if (htonl(0xFFu) != 0xFFu) {
		entry->image.swizzle = true;
	}

	/*
	 * Create the cairo surface and context we'll be using.
	 */
	cairo_surface_t *surface = cairo_image_surface_create(
			CAIRO_FORMAT_ARGB32,
			entry->surface.width,
			entry->surface.height
			);
	cairo_surface_set_device_scale(surface, scale, scale);
	cairo_t *cr = cairo_create(surface);

	/* Running size of current drawing area. */
	int32_t width = entry->surface.width / scale;
	int32_t height = entry->surface.height / scale;

	/* Draw the outer outline */
	//struct color color = entry->border.outline_color;
	//cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
	//cairo_paint(cr);

	///* Move and clip following draws to be within this outline */
	//cairo_translate(
	//		cr,
	//		entry->border.outline_width,
	//		entry->border.outline_width);
	//width -= 2 * entry->border.outline_width;
	//height -= 2 * entry->border.outline_width;
	//cairo_rectangle(cr, 0, 0, width, height);
	//cairo_clip(cr);

	///* Draw the border */
	//color = entry->border.color;
	//cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
	//cairo_paint(cr);

	///* Move and clip following draws to be within the border */
	//cairo_translate(cr, entry->border.width, entry->border.width);
	//width -= 2 * entry->border.width;
	//height -= 2 * entry->border.width;
	//cairo_rectangle(cr, 0, 0, width, height);
	//cairo_clip(cr);

	///* Draw the inner outline */
	//color = entry->border.outline_color;
	//cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
	//cairo_paint(cr);

	///* Move and clip following draws to be within this outline */
	//cairo_translate(
	//		cr,
	//		entry->border.outline_width,
	//		entry->border.outline_width);
	//width -= 2 * entry->border.outline_width;
	//height -= 2 * entry->border.outline_width;
	//cairo_rectangle(cr, 0, 0, width, height);
	//cairo_clip(cr);

	///* Draw the entry background */
	//color = entry->background_color;
	//cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
	//cairo_paint(cr);

	///* Move and clip following draws to be within the specified padding */
	//cairo_translate(cr, entry->padding, entry->padding);
	//width -= 2 * entry->padding;
	//height -= 2 * entry->padding;
	//cairo_rectangle(cr, 0, 0, width, height);
	//cairo_clip(cr);

	/*
	 * Move the cursor back up, so that Pango draws in the correct place if
	 * we're doing a tight layout.
	 */
	//cairo_translate(cr, -entry->text_bounds.x, -entry->text_bounds.y);

	/* Setup Pango. */
	PangoContext *context = pango_cairo_create_context(cr);

	PangoFontDescription *font_description =
		pango_font_description_from_string(entry->font_name);
	pango_font_description_set_size(
			font_description,
			entry->font_size * PANGO_SCALE);
	pango_context_set_font_description(context, font_description);
	pango_font_description_free(font_description);

	entry->pango.entry_layout = pango_layout_new(context);
	pango_layout_set_text(entry->pango.entry_layout, "", -1);

	for (size_t i = 0; i < 5; i++) {
		PangoLayout *layout = pango_layout_new(context);
		pango_layout_set_text(layout, "", -1);
		entry->pango.result_layouts[i] = layout;
	}

	entry->pango.context = context;
	
	entry->cairo.surface = surface;
	entry->cairo.cr = cr;

	entry->image.width = entry->surface.width;
	entry->image.height = entry->surface.height;
	entry->image.buffer = cairo_image_surface_get_data(surface);
}

void entry_destroy(struct entry *entry)
{
	for (size_t i = 0; i < 5; i++) {
		g_object_unref(entry->pango.result_layouts[i]);
	}
	g_object_unref(entry->pango.entry_layout);
	g_object_unref(entry->pango.context);
	cairo_destroy(entry->cairo.cr);
	cairo_surface_destroy(entry->cairo.surface);
}

void entry_update(struct entry *entry)
{
	cairo_t *cr = entry->cairo.cr;
	cairo_save(cr);

	entry->image.redraw = true;

	/* Clear the image. */
	cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
	cairo_paint(cr);
	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);

	/* Draw our text. */
	struct color color = entry->foreground_color;
	cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);

	pango_layout_set_text(entry->pango.entry_layout, entry->input_mb, -1);
	pango_cairo_update_layout(cr, entry->pango.entry_layout);
	pango_cairo_show_layout(cr, entry->pango.entry_layout);

	log_debug("%zu\n", entry->results.count);
	for (size_t i = 0; i < 5; i++) {
		cairo_translate(cr, 0, 50);
		PangoLayout *layout = entry->pango.result_layouts[i];
		const char *str;
		if (i < entry->results.count) {
			str = entry->results.buf[i];
		} else {
			str = "";
		}
		pango_layout_set_text(layout, str, -1);
		pango_cairo_update_layout(cr, layout);
		pango_cairo_show_layout(cr, layout);
	}
	cairo_restore(cr);
}

void entry_set_scale(struct entry *entry, uint32_t scale)
{
	cairo_surface_set_device_scale(entry->cairo.surface, scale, scale);
}