#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
/*****************************************************************************
 * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
 *
 * OpenRCT2 is the work of many authors, a full list can be found in contributors.md
 * For more information, visit https://github.com/OpenRCT2/OpenRCT2
 *
 * OpenRCT2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * A full copy of the GNU General Public License can be found in licence.txt
 *****************************************************************************/
#pragma endregion

#include "../input.h"
#include "../interface/widget.h"
#include "../interface/window.h"
#include "../localisation/localisation.h"
#include "../rct2.h"
#include "../scenario/scenario.h"
#include "../sprites.h"
#include "dropdown.h"

sint32 gAppropriateImageDropdownItemsPerRow[] = {
	1, 1, 1, 1, 2, 2, 3, 3, 4,
	3, 5, 4, 4, 5, 5, 5, 4, 5,
	6, 5, 5, 7, 4, 5, 6, 5, 6,
	6, 6, 6, 6, 8, 8, 0
};

enum {
	WIDX_BACKGROUND,
};

static rct_widget window_dropdown_widgets[] = {
	{ WWT_IMGBTN, 0, 0, 0, 0, 0, SPR_NONE, STR_NONE },
	{ WIDGETS_END },
};

sint32 _dropdown_num_columns;
sint32 _dropdown_num_rows;
sint32 _dropdown_item_width;
sint32 _dropdown_item_height;

sint32 gDropdownNumItems;
rct_string_id gDropdownItemsFormat[64];
sint64 gDropdownItemsArgs[64];
uint64 gDropdownItemsChecked;
uint64 gDropdownItemsDisabled;
bool gDropdownIsColour;
sint32 gDropdownLastColourHover;
sint32 gDropdownHighlightedIndex;
sint32 gDropdownDefaultIndex;

bool dropdown_is_checked(sint32 index)
{
	return gDropdownItemsChecked & (1ULL << index);
}

bool dropdown_is_disabled(sint32 index)
{
	return gDropdownItemsDisabled & (1ULL << index);
}

void dropdown_set_checked(sint32 index, bool value)
{
	if (value) {
		gDropdownItemsChecked |= 1ULL << index;
	} else {
		gDropdownItemsChecked &= ~(1ULL << index);
	}
}

void dropdown_set_disabled(sint32 index, bool value)
{
	if (value) {
		gDropdownItemsDisabled |= 1ULL << index;
	} else {
		gDropdownItemsDisabled &= ~(1ULL << index);
	}
}

static void window_dropdown_paint(rct_window *w, rct_drawpixelinfo *dpi);

static rct_window_event_list window_dropdown_events = {
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	window_dropdown_paint,
	NULL
};

/**
 * Shows a text dropdown menu.
 *  rct2: 0x006ECFB9
 *
 * @param x (cx)
 * @param y (dx)
 * @param extray (di)
 * @param flags (bh)
 * @param num_items (bx)
 * @param colour (al)
 */
void window_dropdown_show_text(sint32 x, sint32 y, sint32 extray, uint8 colour, uint8 flags, size_t num_items)
{
	sint32 string_width, max_string_width;
	char buffer[256];

	// Calculate the longest string width
	max_string_width = 0;
	for (size_t i = 0; i < num_items; i++) {
		format_string(buffer, 256, gDropdownItemsFormat[i], (void*)(&gDropdownItemsArgs[i]));
		gCurrentFontSpriteBase = FONT_SPRITE_BASE_MEDIUM;
		string_width = gfx_get_string_width(buffer);
		max_string_width = max(string_width, max_string_width);
	}

	window_dropdown_show_text_custom_width(x, y, extray, colour, 0, flags, num_items, max_string_width + 3);
}

/**
 * Shows a text dropdown menu.
 *  rct2: 0x006ECFB9, although 0x006ECE50 is real version
 *
 * @param x (cx)
 * @param y (dx)
 * @param extray (di)
 * @param flags (bh)
 * @param num_items (bx)
 * @param colour (al)
 * @param custom_height (ah) requires flag set as well
 */
void window_dropdown_show_text_custom_width(sint32 x, sint32 y, sint32 extray, uint8 colour, uint8 custom_height, uint8 flags, size_t num_items, sint32 width)
{
	rct_window* w;

	input_set_flag(INPUT_FLAG_DROPDOWN_STAY_OPEN | INPUT_FLAG_DROPDOWN_MOUSE_UP, false);
	if (flags & DROPDOWN_FLAG_STAY_OPEN)
		input_set_flag(INPUT_FLAG_DROPDOWN_STAY_OPEN, true);

	window_dropdown_close();
	_dropdown_num_columns = 1;
	_dropdown_item_width = width;
	_dropdown_item_height = 10;
	if (flags & DROPDOWN_FLAG_CUSTOM_HEIGHT)
		_dropdown_item_height = custom_height;

	// Set the widgets
	gDropdownNumItems = (sint32)num_items;
	_dropdown_num_rows = (sint32)num_items;

	width = _dropdown_item_width * _dropdown_num_columns + 3;
	sint32 height = _dropdown_item_height * _dropdown_num_rows + 3;
	if (x + width > gScreenWidth)
		x = max(0, gScreenWidth - width);
	if (y + height > gScreenHeight)
		y = max(0, gScreenHeight - height);

	window_dropdown_widgets[WIDX_BACKGROUND].bottom = (sint16)(_dropdown_item_height * num_items + 3);
	window_dropdown_widgets[WIDX_BACKGROUND].right = (sint16)(_dropdown_item_width + 3);

	// Create the window
	w = window_create(
		x, y + extray,
		window_dropdown_widgets[WIDX_BACKGROUND].right + 1,
		window_dropdown_widgets[WIDX_BACKGROUND].bottom + 1,
		&window_dropdown_events,
		WC_DROPDOWN,
		WF_STICK_TO_FRONT
	);
	w->widgets = window_dropdown_widgets;
	if (colour & COLOUR_FLAG_TRANSLUCENT)
		w->flags |= WF_TRANSPARENT;
	w->colours[0] = colour;

	// Input state
	gDropdownHighlightedIndex = -1;
	gDropdownItemsDisabled = 0;
	gDropdownItemsChecked = 0;
	gDropdownIsColour = false;
	gDropdownDefaultIndex = -1;
	input_set_state(INPUT_STATE_DROPDOWN_ACTIVE);
}

/**
 * Shows an image dropdown menu.
 *  rct2: 0x006ECFB9
 *
 * @param x (cx)
 * @param y (dx)
 * @param extray (di)
 * @param flags (bh)
 * @param numItems (bx)
 * @param colour (al)
 * @param itemWidth (bp)
 * @param itemHeight (ah)
 * @param numColumns (bl)
 */
void window_dropdown_show_image(sint32 x, sint32 y, sint32 extray, uint8 colour, uint8 flags, sint32 numItems, sint32 itemWidth, sint32 itemHeight, sint32 numColumns)
{
	sint32 width, height;
	rct_window* w;

	input_set_flag(INPUT_FLAG_DROPDOWN_STAY_OPEN | INPUT_FLAG_DROPDOWN_MOUSE_UP, false);
	if (flags & DROPDOWN_FLAG_STAY_OPEN)
		input_set_flag(INPUT_FLAG_DROPDOWN_STAY_OPEN, true);

	// Close existing dropdown
	window_dropdown_close();

	// Set and calculate num items, rows and columns
	_dropdown_item_width = itemWidth;
	_dropdown_item_height = itemHeight;
	gDropdownNumItems = numItems;
	_dropdown_num_columns = numColumns;
	_dropdown_num_rows = gDropdownNumItems / _dropdown_num_columns;
	if (gDropdownNumItems % _dropdown_num_columns != 0)
		_dropdown_num_rows++;

	// Calculate position and size
	width = _dropdown_item_width * _dropdown_num_columns + 3;
	height = _dropdown_item_height * _dropdown_num_rows + 3;
	if (x + width > gScreenWidth)
		x = max(0, gScreenWidth - width);
	if (y + height > gScreenHeight)
		y = max(0, gScreenHeight - height);
	window_dropdown_widgets[WIDX_BACKGROUND].right = width;
	window_dropdown_widgets[WIDX_BACKGROUND].bottom = height;

	// Create the window
	w = window_create(
		x, y + extray,
		window_dropdown_widgets[WIDX_BACKGROUND].right + 1,
		window_dropdown_widgets[WIDX_BACKGROUND].bottom + 1,
		&window_dropdown_events,
		WC_DROPDOWN,
		WF_STICK_TO_FRONT
	);
	w->widgets = window_dropdown_widgets;
	if (colour & COLOUR_FLAG_TRANSLUCENT)
		w->flags |= WF_TRANSPARENT;
	w->colours[0] = colour;

	// Input state
	gDropdownHighlightedIndex = -1;
	gDropdownItemsDisabled = 0;
	gDropdownItemsChecked = 0;
	gDropdownIsColour = false;
	gDropdownDefaultIndex = -1;
	input_set_state(INPUT_STATE_DROPDOWN_ACTIVE);
}

void window_dropdown_close()
{
	window_close_by_class(WC_DROPDOWN);
}

static void window_dropdown_paint(rct_window *w, rct_drawpixelinfo *dpi)
{
	sint32 cell_x, cell_y, l, t, r, b, item, image, colour;

	window_draw_widgets(w, dpi);

	sint32 highlightedIndex = gDropdownHighlightedIndex;
	for (sint32 i = 0; i < gDropdownNumItems; i++) {
		cell_x = i % _dropdown_num_columns;
		cell_y = i / _dropdown_num_columns;

		if (gDropdownItemsFormat[i] == DROPDOWN_SEPARATOR) {
			l = w->x + 2 + (cell_x * _dropdown_item_width);
			t = w->y + 2 + (cell_y * _dropdown_item_height);
			r = l + _dropdown_item_width - 1;
			t += (_dropdown_item_height / 2);
			b = t;

			if (w->colours[0] & COLOUR_FLAG_TRANSLUCENT) {
				translucent_window_palette palette = TranslucentWindowPalettes[BASE_COLOUR(w->colours[0])];
				gfx_filter_rect(dpi, l, t, r, b, palette.highlight);
				gfx_filter_rect(dpi, l, t + 1, r, b + 1, palette.shadow);
			} else {
				gfx_fill_rect(dpi, l, t, r, b, ColourMapA[w->colours[0]].mid_dark);
				gfx_fill_rect(dpi, l, t + 1, r, b + 1, ColourMapA[w->colours[0]].lightest);
			}
		} else {
			//
			if (i == highlightedIndex) {
				l = w->x + 2 + (cell_x * _dropdown_item_width);
				t = w->y + 2 + (cell_y * _dropdown_item_height);
				r = l + _dropdown_item_width - 1;
				b = t + _dropdown_item_height - 1;
				gfx_filter_rect(dpi, l, t, r, b, PALETTE_DARKEN_3);
			}

			item = gDropdownItemsFormat[i];
			if (item == (uint16)-1 || item == (uint16)-2) {
				// Image item
				image = (uint32)gDropdownItemsArgs[i];
				if (item == (uint16)-2 && highlightedIndex == i)
					image++;

				gfx_draw_sprite(
					dpi,
					image,
					w->x + 2 + (cell_x * _dropdown_item_width),
					w->y + 2 + (cell_y * _dropdown_item_height), 0
				);
			} else {
				// Text item
				if (i < 64) {
					if (dropdown_is_checked(i)) {
						item++;
					}
				}

				// Calculate colour
				colour = NOT_TRANSLUCENT(w->colours[0]);
				if (i == highlightedIndex)
					colour = COLOUR_WHITE;
				if (dropdown_is_disabled(i))
					if (i < 64)
						colour = NOT_TRANSLUCENT(w->colours[0]) | COLOUR_FLAG_INSET;

				// Draw item string
				gfx_draw_string_left_clipped(
					dpi,
					item,
					(void*)(&gDropdownItemsArgs[i]), colour,
					w->x + 2 + (cell_x * _dropdown_item_width),
					w->y + 1 + (cell_y * _dropdown_item_height),
					w->width - 5
				);
			}
		}
	}
}

/**
 * New function based on 6e914e
 * returns -1 if index is invalid
 */
sint32 dropdown_index_from_point(sint32 x, sint32 y, rct_window *w)
{
	sint32 top = y - w->y - 2;
	if (top < 0) return -1;

	sint32 left = x - w->x;
	if (left >= w->width) return -1;
	left -= 2;
	if (left < 0) return -1;

	sint32 column_no = left / _dropdown_item_width;
	if (column_no >= _dropdown_num_columns) return -1;

	sint32 row_no = top / _dropdown_item_height;
	if (row_no >= _dropdown_num_rows) return -1;

	sint32 dropdown_index = row_no * _dropdown_num_columns + column_no;
	if (dropdown_index >= gDropdownNumItems) return -1;

	return dropdown_index;
}

void window_dropdown_show_colour(rct_window *w, rct_widget *widget, uint8 dropdownColour, uint8 selectedColour)
{
	window_dropdown_show_colour_available(w, widget, dropdownColour, selectedColour, 0xFFFFFFFF);
}

/**
 *
 *  rct2: 0x006ED43D
 * al: dropdown colour
 * ah: selected colour
 * esi: window
 * edi: widget
 * ebp: unknown
 */
void window_dropdown_show_colour_available(rct_window *w, rct_widget *widget, uint8 dropdownColour, uint8 selectedColour,
	uint32 availableColours)
{
	sint32 i, numItems;

	// Count number of available colours
	numItems = 0;
	for (i = 0; i < 32; i++)
		if (availableColours & (1 << i))
			numItems++;

	sint32 defaultIndex = -1;
	// Set items
	for (i = 0; i < 32; i++) {
		if (availableColours & (1 << i)) {
			if (selectedColour == i)
				defaultIndex = i;

			gDropdownItemsFormat[i] = 0xFFFE;
			gDropdownItemsArgs[i] = ((uint64)i << 32) | (0x20000000 | (i << 19) | SPR_PALETTE_BTN);
		}
	}

	// Show dropdown
	window_dropdown_show_image(
		w->x + widget->left,
		w->y + widget->top,
		widget->bottom - widget->top + 1,
		dropdownColour,
		DROPDOWN_FLAG_STAY_OPEN,
		numItems,
		12,
		12,
		gAppropriateImageDropdownItemsPerRow[numItems]
	);

	gDropdownIsColour = true;
	gDropdownLastColourHover = -1;
	gDropdownDefaultIndex = defaultIndex;
}