/*
 * Copyright (C) Volition, Inc. 1999.  All rights reserved.
 *
 * All source code herein is the property of Volition, Inc. You may not sell 
 * or otherwise commercially exploit the source or things you created based on the 
 * source.
 *
*/



#include "anim/animplay.h"
#include "anim/packunpack.h"
#include "gamehelp/contexthelp.h"
#include "gamesequence/gamesequence.h"
#include "gamesnd/eventmusic.h"
#include "gamesnd/gamesnd.h"
#include "globalincs/alphacolors.h"
#include "graphics/font.h"
#include "io/key.h"
#include "io/timer.h"
#include "mission/missionparse.h"
#include "mission/missionbriefcommon.h"
#include "missionui/missioncmdbrief.h"
#include "missionui/missionscreencommon.h"
#include "missionui/missionshipchoice.h"
#include "missionui/missionweaponchoice.h"
#include "missionui/redalert.h"
#include "network/multi.h"
#include "network/multi_endgame.h"
#include "network/multiteamselect.h"
#include "parse/sexp_container.h"
#include "playerman/player.h"
#include "sound/audiostr.h"
#include "sound/fsspeech.h"
#include "ui/uidefs.h"



#define NUM_CMD_SETTINGS	2

const char *Cmd_brief_fname[NUM_CMD_SETTINGS][GR_NUM_RESOLUTIONS] =
{
	{
		"CommandBrief",
		"2_CommandBrief"
	},
	{
		"CommandBriefb",
		"2_CommandBriefb"
	}
};


const char *Cmd_brief_mask[NUM_CMD_SETTINGS][GR_NUM_RESOLUTIONS] =
{
	{
		"CommandBrief-m",
		"2_CommandBrief-m"
	},
	{
		"CommandBrief-mb",
		"2_CommandBrief-mb"
	},
};


// lookups for coordinates
#define CMD_X_COORD 0
#define CMD_Y_COORD 1
#define CMD_W_COORD 2
#define CMD_H_COORD 3

int Cmd_text_wnd_coords[NUM_CMD_SETTINGS][GR_NUM_RESOLUTIONS][4] =
{
	// original
	{
		{
			17, 109, 606, 108			// GR_640
		},
		{
			28, 174, 969, 174			// GR_1024
		}
	},
	// buttons
	{
		{
			17, 109, 587, 108			// GR_640
		},
		{
			28, 174, 939, 174			// GR_1024
		}
	}
};

int Cmd_stage_y[GR_NUM_RESOLUTIONS] =
{
	90,		// GR_640
	145		// GR_1024
};

// Goober5000 - center coordinates only
int Cmd_image_center_coords[GR_NUM_RESOLUTIONS][2] =
{
	{
		246, 358				// GR_640
	},
	{
		394, 573				// GR_1024
	}
};

int Top_cmd_brief_text_line;

int Max_cmdbrief_Lines; // Maximum number of lines to be displayed

#define MAX_CMD_BRIEF_BUTTONS	10
#define MIN_CMD_BRIEF_BUTTONS	8
#define NUM_CMD_BRIEF_BUTTONS	(Uses_scroll_buttons ? MAX_CMD_BRIEF_BUTTONS : MIN_CMD_BRIEF_BUTTONS)

#define CMD_BRIEF_BUTTON_FIRST_STAGE	0
#define CMD_BRIEF_BUTTON_PREV_STAGE		1
#define CMD_BRIEF_BUTTON_PAUSE			2
#define CMD_BRIEF_BUTTON_NEXT_STAGE		3
#define CMD_BRIEF_BUTTON_LAST_STAGE		4
#define CMD_BRIEF_BUTTON_HELP			5
#define CMD_BRIEF_BUTTON_OPTIONS		6
#define CMD_BRIEF_BUTTON_ACCEPT			7
#define CMD_BRIEF_BUTTON_SCROLL_UP		8
#define CMD_BRIEF_BUTTON_SCROLL_DOWN	9

// buttons
ui_button_info Cmd_brief_buttons[GR_NUM_RESOLUTIONS][MAX_CMD_BRIEF_BUTTONS] =
{
	{ // GR_640
		ui_button_info("CBB_00",	504,	221,	-1,	-1,	0),
		ui_button_info("CBB_01",	527,	221,	-1,	-1,	1),
		ui_button_info("CBB_02",	555,	221,	-1,	-1,	2),
		ui_button_info("CBB_03",	583,	221,	-1,	-1,	3),
		ui_button_info("CBB_04",	607,	221,	-1,	-1,	4),
		ui_button_info("CBB_05",	539,	431,	-1,	-1,	5),
		ui_button_info("CBB_06",	538,	455,	-1,	-1,	6),
		ui_button_info("CBB_07",	575,	432,	-1,	-1,	7),
		ui_button_info("CBB_08",	615,	144,	-1,	-1,	8),
		ui_button_info("CBB_09",	615,	186,	-1,	-1,	9),
	},
	{ // GR_1024
		ui_button_info("2_CBB_00",	806,	354,	-1,	-1,	0),
		ui_button_info("2_CBB_01",	844,	354,	-1,	-1,	1),
		ui_button_info("2_CBB_02",	888,	354,	-1,	-1,	2),
		ui_button_info("2_CBB_03",	933,	354,	-1,	-1,	3),
		ui_button_info("2_CBB_04",	971,	354,	-1,	-1,	4),
		ui_button_info("2_CBB_05",	863,	690,	-1,	-1,	5),
		ui_button_info("2_CBB_06",	861,	728,	-1,	-1,	6),
		ui_button_info("2_CBB_07",	920,	692,	-1,	-1,	7),
		ui_button_info("2_CBB_08",	985,	232,	-1,	-1,	8),
		ui_button_info("2_CBB_09",	985,	299,	-1,	-1,	9),
	}
};

// text
#define CMD_BRIEF_NUM_TEXT		3
UI_XSTR Cmd_brief_text[GR_NUM_RESOLUTIONS][CMD_BRIEF_NUM_TEXT] =
{
	{ // GR_640
		{ "Help",		928,	500,	440,	UI_XSTR_COLOR_GREEN,	-1,	&Cmd_brief_buttons[0][CMD_BRIEF_BUTTON_HELP].button },
		{ "Options",	1036,	479,	464,	UI_XSTR_COLOR_GREEN,	-1,	&Cmd_brief_buttons[0][CMD_BRIEF_BUTTON_OPTIONS].button },
		{ "Continue",	1069,	564,	413,	UI_XSTR_COLOR_PINK,	-1,	&Cmd_brief_buttons[0][CMD_BRIEF_BUTTON_ACCEPT].button },
	},
	{ // GR_1024
		{ "Help",		928,	820,	704,	UI_XSTR_COLOR_GREEN,	-1,	&Cmd_brief_buttons[1][CMD_BRIEF_BUTTON_HELP].button },
		{ "Options",	1036,	797,	743,	UI_XSTR_COLOR_GREEN,	-1,	&Cmd_brief_buttons[1][CMD_BRIEF_BUTTON_OPTIONS].button },
		{ "Continue",	1069,	936,	661,	UI_XSTR_COLOR_PINK,	-1,	&Cmd_brief_buttons[1][CMD_BRIEF_BUTTON_ACCEPT].button },
	}
};

static UI_WINDOW Ui_window;
static int Cmd_brief_background_bitmap;					// bitmap for the background of the cmd_briefing
static int Cur_stage;
static int Cmd_brief_inited = 0;
static int Voice_good_to_go = 0;
static int Voice_started_time = 0;
static int Voice_ended_time;
static generic_anim Cur_Anim;
static const char *Cur_anim_filename = "~~~~";

static int Cmd_brief_last_voice;
static int Cmd_brief_last_stage;
static int Cmd_brief_paused = 0;

static int Uses_scroll_buttons = 0;

int Cmd_brief_overlay_id;

void cmd_brief_init_voice()
{
	int i;

	Assert(Cur_cmd_brief);
	for (i=0; i<Cur_cmd_brief->num_stages; i++) {
		Cur_cmd_brief->stage[i].wave = -1;
		if (stricmp(Cur_cmd_brief->stage[i].wave_filename, NOX("none")) != 0 && Cur_cmd_brief->stage[i].wave_filename[0]) {
			Cur_cmd_brief->stage[i].wave = audiostream_open(Cur_cmd_brief->stage[i].wave_filename, ASF_VOICE);
			if (Cur_cmd_brief->stage[i].wave < 0) {
				nprintf(("General", "Failed to load \"%s\"\n", Cur_cmd_brief->stage[i].wave_filename));
			}
		}
	}

	Cmd_brief_last_voice = -1;
	Cmd_brief_last_stage = -1;
}

int cmd_brief_check_stage_done()
{
	if (!Voice_good_to_go)
		return 0;

	if (Cmd_brief_paused)
		return 0;

	if (Voice_ended_time && (timer_get_milliseconds() - Voice_ended_time >= 1000))
		return 1;

	// check normal speech
	if (Briefing_voice_enabled && (Cmd_brief_last_voice >= 0)) {
		if (audiostream_is_playing(Cmd_brief_last_voice)) {
			return 0;
		}

		if (!Voice_ended_time) {
			Voice_ended_time = timer_get_milliseconds();
		}

		return 0;
	}

	// check simulated speech
	if (Briefing_voice_enabled && (Cmd_brief_last_stage >= 0)) {
		if (fsspeech_playing()) {
			return 0;
		}

		if (!Voice_ended_time) {
			Voice_ended_time = timer_get_milliseconds();
		}

		return 0;
	}

	// if we get here, there is no voice, so we simulate the time it would take instead
	if (!Voice_ended_time)
		Voice_ended_time = Voice_started_time + MAX(5000, Num_brief_text_lines[0] * 3500);

	return 0;
}

/**
 * Start playback of the voice for a particular briefing stage
 * @param stage_num Particular briefing stage
 */
void cmd_brief_voice_play(int stage_num)
{
	int voice = -1;
	int stage = -1;

	if (!Voice_good_to_go) {
		Voice_started_time = 0;
		return;
	}

	if (!Voice_started_time) {
		Voice_started_time = timer_get_milliseconds();
		Voice_ended_time = 0;
	}

	if (!Briefing_voice_enabled){
		return;
	}

	if (Cur_stage >= 0 && Cur_stage < Cur_cmd_brief->num_stages){
		voice = Cur_cmd_brief->stage[stage_num].wave;
		stage = stage_num;
	}

	// do we need to play simulated speech?
	if (voice < 0 && fsspeech_play_from(FSSPEECH_FROM_BRIEFING)) {
		// are we still on the same stage?
		if (Cmd_brief_last_stage == stage) {
			return;  // no changes, nothing to do.
		}

		// if previous stage is still playing, stop it first.
		if (Cmd_brief_last_stage >= 0) {
			fsspeech_stop();
			Cmd_brief_last_stage = -1;
		}

		// ok, new text needs speaking
		Cmd_brief_last_stage = stage;
		if (stage >= 0) {
			fsspeech_play(FSSPEECH_FROM_BRIEFING, Cur_cmd_brief->stage[stage_num].text.c_str());
		}
	} else {
		// are we still on same voice that is currently playing/played?
		if (Cmd_brief_last_voice == voice) {
			return;  // no changes, nothing to do.
		}

		// if previous wave is still playing, stop it first.
		if (Cmd_brief_last_voice >= 0) {
			audiostream_stop(Cmd_brief_last_voice, 1, 0);  // stream is automatically rewound
			Cmd_brief_last_voice = -1;
		}

		// ok, new wave needs playing, so we can start playing it now (and it becomes the current wave)
		Cmd_brief_last_voice = voice;
		if (voice >= 0) {
			audiostream_play(voice, Master_voice_volume, 0);
		}
	}
}

/**
 * called to leave the command briefing screen
 */
void cmd_brief_exit()
{
	// I know, going to red alert from cmd brief is stupid, but we have stupid fredders
	if (red_alert_mission()) {
		gameseq_post_event(GS_EVENT_RED_ALERT);
	} else {
		gameseq_post_event(GS_EVENT_START_BRIEFING);
	}
}

/**
 * Doesn't actually stop playing ANIs any more, just stops audio
 */
void cmd_brief_stop_anim()
{
	Voice_good_to_go = 0;
	if (Cmd_brief_last_voice >= 0) {
		audiostream_stop(Cmd_brief_last_voice, 1, 0);  // stream is automatically rewound
		Cmd_brief_last_voice = -1;
	}
	if (Cmd_brief_last_stage >= 0) {
		fsspeech_stop();
		Cmd_brief_last_stage = -1;
	}
}

void cmd_brief_new_stage(int stage)
{
	if (stage < 0) {
		cmd_brief_stop_anim();
		Cur_stage = -1;
	}

	// Make sure that the text wrapping and the rendering code use the same font
	font::set_font(font::FONT1);

	// fire the script hook
	common_fire_stage_script_hook(stage, Cur_stage);

	Cur_stage = stage;
	brief_color_text_init(Cur_cmd_brief->stage[stage].text.c_str(), Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_W_COORD], default_command_briefing_color);

	// load a new animation if it's different to what's already playing
	if (strcmp(Cur_anim_filename, Cur_cmd_brief->stage[stage].ani_filename) != 0) {
		// unload the previous anim
		if(Cur_Anim.num_frames > 0) {
			generic_anim_unload(&Cur_Anim);
		}

		// save new filename
		Cur_anim_filename = Cur_cmd_brief->stage[stage].ani_filename;

		// try to load the new anim in either high or low res
		int stream_result = generic_anim_init_and_stream(&Cur_Anim, Cur_anim_filename, bm_get_type(Cmd_brief_background_bitmap), true);

		// we've failed to load any animation
		if (stream_result < 0) {
			// load an image and treat it like a 1 frame animation
			Cur_Anim.first_frame = bm_load(Cur_cmd_brief->stage[stage].ani_filename);	//if we fail here, the value is still -1
			if(Cur_Anim.first_frame != -1) {
				Cur_Anim.num_frames = 1;
			}
		}
	}

	//resetting the audio here
	cmd_brief_stop_anim();

	Top_cmd_brief_text_line = 0;
}

void cmd_brief_hold()
{
	cmd_brief_stop_anim();
}

void cmd_brief_unhold()
{
	cmd_brief_new_stage(Cur_stage);
}

extern int Briefing_music_handle;

void cmd_brief_pause()
{
	if (Cmd_brief_paused)
		return;

	Cmd_brief_paused = 1;

	if (Cmd_brief_last_voice >= 0) {
		audiostream_pause(Cmd_brief_last_voice);
	}
	if (Cmd_brief_last_stage >= 0) {
		fsspeech_pause(true);
	}

	if (Briefing_music_handle >= 0) {
		audiostream_pause(Briefing_music_handle);
	}
}

void cmd_brief_unpause()
{
	if (!Cmd_brief_paused)
		return;

	Cmd_brief_paused = 0;

	if (Cmd_brief_last_voice >= 0) {
		audiostream_unpause(Cmd_brief_last_voice);
	}
	if (Cmd_brief_last_stage >= 0) {
		fsspeech_pause(false);
	}

	if (Briefing_music_handle >= 0) {
		audiostream_unpause(Briefing_music_handle);
	}
}

void cmd_brief_button_pressed(int n)
{
	switch (n) {
		case CMD_BRIEF_BUTTON_HELP:
			launch_context_help();
			gamesnd_play_iface(InterfaceSounds::HELP_PRESSED);
			break;

		case CMD_BRIEF_BUTTON_OPTIONS:
			gamesnd_play_iface(InterfaceSounds::SWITCH_SCREENS);
			gameseq_post_event(GS_EVENT_OPTIONS_MENU);
			break;

		case CMD_BRIEF_BUTTON_FIRST_STAGE:
			if (common_num_cutscenes_valid(MOVIE_PRE_CMD_BRIEF)) {
				audiostream_stop(Cmd_brief_last_voice);
				common_maybe_play_cutscene(MOVIE_PRE_CMD_BRIEF, true, SCORE_BRIEFING);
				cmd_brief_new_stage(0);
			}
			else if (Cur_stage) {
				cmd_brief_new_stage(0);
				gamesnd_play_iface(InterfaceSounds::BRIEF_STAGE_CHG);
			} 
			else {
				gamesnd_play_iface(InterfaceSounds::GENERAL_FAIL);
			}

			break;

		case CMD_BRIEF_BUTTON_PREV_STAGE:
			if (!Cur_stage && common_num_cutscenes_valid(MOVIE_PRE_CMD_BRIEF)) {
				audiostream_stop(Cmd_brief_last_voice);
				common_maybe_play_cutscene(MOVIE_PRE_CMD_BRIEF, true, SCORE_BRIEFING);
				cmd_brief_new_stage(0);
			}
			else if (Cur_stage) {
				cmd_brief_new_stage(Cur_stage - 1);
				gamesnd_play_iface(InterfaceSounds::BRIEF_STAGE_CHG);
			} else {
				gamesnd_play_iface(InterfaceSounds::GENERAL_FAIL);
			}

			break;

		case CMD_BRIEF_BUTTON_NEXT_STAGE:
			if (Cur_stage < Cur_cmd_brief->num_stages - 1) {
				cmd_brief_new_stage(Cur_stage + 1);
				gamesnd_play_iface(InterfaceSounds::BRIEF_STAGE_CHG);
			} else {
				gamesnd_play_iface(InterfaceSounds::GENERAL_FAIL);
			}

			break;

		case CMD_BRIEF_BUTTON_LAST_STAGE:
			if (Cur_stage < Cur_cmd_brief->num_stages - 1) {
				cmd_brief_new_stage(Cur_cmd_brief->num_stages - 1);
				gamesnd_play_iface(InterfaceSounds::BRIEF_STAGE_CHG);
			} else {
				gamesnd_play_iface(InterfaceSounds::GENERAL_FAIL);
			}
			break;

		case CMD_BRIEF_BUTTON_ACCEPT:
			cmd_brief_exit();
			gamesnd_play_iface(InterfaceSounds::COMMIT_PRESSED);
			break;

		case CMD_BRIEF_BUTTON_PAUSE:
			gamesnd_play_iface(InterfaceSounds::USER_SELECT);
			fsspeech_pause(Player->auto_advance != 0);
			Player->auto_advance ^= 1;
			break;

		case CMD_BRIEF_BUTTON_SCROLL_UP:
			Top_cmd_brief_text_line--;
			if ( Top_cmd_brief_text_line < 0 ) {
				Top_cmd_brief_text_line = 0;
				gamesnd_play_iface(InterfaceSounds::GENERAL_FAIL);
			} else {
				gamesnd_play_iface(InterfaceSounds::SCROLL);
			}
			break;

		case CMD_BRIEF_BUTTON_SCROLL_DOWN:
			Top_cmd_brief_text_line++;
			if ( (Num_brief_text_lines[0] - Top_cmd_brief_text_line) < Max_cmdbrief_Lines) {
				Top_cmd_brief_text_line--;
				gamesnd_play_iface(InterfaceSounds::GENERAL_FAIL);
			} else {
				gamesnd_play_iface(InterfaceSounds::SCROLL);
			}
			break;
	}
}

void cmd_brief_ani_wave_init(int index)
{
	const char *name;

	// this is the first instance of the given anim filename
	name = Cur_cmd_brief->stage[index].ani_filename;
	if (!name[0] || !stricmp(name, NOX("<default>")) || !stricmp(name, NOX("none.ani"))) {
		name = NOX("CB_default");
		strcpy_s(Cur_cmd_brief->stage[index].ani_filename, name);
	}
}

void cmd_brief_init(int team)
{
	common_music_init(SCORE_BRIEFING);

	int i;
	ui_button_info *b;

	Cmd_brief_inited = 0;
	Cur_cmd_brief = &Cmd_briefs[team];

	// Goober5000 - replace any variables (probably persistent variables) with their values
	// karajorma/jg18 - replace container references as well
	for (i = 0; i < Cur_cmd_brief->num_stages; i++) {
		sexp_replace_variable_names_with_values(Cur_cmd_brief->stage[i].text);
		sexp_container_replace_refs_with_values(Cur_cmd_brief->stage[i].text);
	}

	if (Cur_cmd_brief->num_stages <= 0)
		return;

	// for multiplayer, change the state in my netplayer structure
	if (Game_mode & GM_MULTIPLAYER) {
		Net_player->state = NETPLAYER_STATE_CMD_BRIEFING;
	}

	gr_reset_clip();
	gr_clear();
	gr_flip();

	// first determine which layout to use
	Uses_scroll_buttons = 1;	// assume true
	Cmd_brief_background_bitmap = mission_ui_background_load(Cur_cmd_brief->background[gr_screen.res], Cmd_brief_fname[Uses_scroll_buttons][gr_screen.res]);	// try to load extra one first
	if (Cmd_brief_background_bitmap < 0)	// failed to load
	{
		Uses_scroll_buttons = 0;	// nope, sorry
		Cmd_brief_background_bitmap = mission_ui_background_load(NULL, Cmd_brief_fname[Uses_scroll_buttons][gr_screen.res]);
	}
	mprintf(("Command Briefing UI: %s scroll buttons\n", Uses_scroll_buttons != 0 ? "Using" : "Not using"));

	Ui_window.create(0, 0, gr_screen.max_w_unscaled, gr_screen.max_h_unscaled, 0);
	Ui_window.set_mask_bmap(Cmd_brief_mask[Uses_scroll_buttons][gr_screen.res]);

	for (i=0; i<NUM_CMD_BRIEF_BUTTONS; i++) {
		b = &Cmd_brief_buttons[gr_screen.res][i];

		b->button.create(&Ui_window, "", b->x, b->y, 60, 30, 0, 1);
		// set up callback for when a mouse first goes over a button
		b->button.set_highlight_action(common_play_highlight_sound);
		b->button.set_bmaps(b->filename);
		b->button.link_hotspot(b->hotspot);
	}

	// add text
	for(i=0; i<CMD_BRIEF_NUM_TEXT; i++){
		Ui_window.add_XSTR(&Cmd_brief_text[gr_screen.res][i]);
	}

	// set up readyrooms for buttons so we draw the correct animation frame when a key is pressed
	Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_FIRST_STAGE].button.set_hotkey(KEY_SHIFTED | KEY_LEFT);
	Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_LAST_STAGE].button.set_hotkey(KEY_SHIFTED | KEY_RIGHT);
	Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_PREV_STAGE].button.set_hotkey(KEY_LEFT);
	Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_NEXT_STAGE].button.set_hotkey(KEY_RIGHT);
	Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_ACCEPT].button.set_hotkey(KEY_CTRLED | KEY_ENTER);
	Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_HELP].button.set_hotkey(KEY_F1);
	Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_OPTIONS].button.set_hotkey(KEY_F2);

	// extra - Goober5000
	if (Uses_scroll_buttons)
	{
		Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_SCROLL_UP].button.set_hotkey(KEY_UP);
		Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_SCROLL_DOWN].button.set_hotkey(KEY_DOWN);
	}

	// load in help overlay bitmap	
	Cmd_brief_overlay_id = help_overlay_get_index(CMD_BRIEF_OVERLAY);
	help_overlay_set_state(Cmd_brief_overlay_id,gr_screen.res,0);

	for (i=0; i<Cur_cmd_brief->num_stages; i++)
		cmd_brief_ani_wave_init(i);

	cmd_brief_init_voice();
	cmd_brief_new_stage(0);
	Cmd_brief_paused = 0;
	Cmd_brief_inited = 1;
}

void cmd_brief_close()
{
	int i;

	if (Cmd_brief_inited) {
		cmd_brief_stop_anim();
		generic_anim_unload(&Cur_Anim);
		for (i=0; i<Cur_cmd_brief->num_stages; i++) {
			if (Cur_cmd_brief->stage[i].wave >= 0)
				audiostream_close_file(Cur_cmd_brief->stage[i].wave, 0);

		}

		// so that the same ani will reload properly upon return
		Cur_anim_filename = "~~~~";

		if (Cmd_brief_background_bitmap >= 0)
			bm_release(Cmd_brief_background_bitmap);

		Ui_window.destroy();

		game_flush();
		Cmd_brief_inited = 0;
	}

	// Stop any speech from running over
	fsspeech_stop();
}

void cmd_brief_do_frame(float frametime)
{
	char buf[40];
	int i, k, w, h, x, y;

	// if no command briefing exists, skip this screen.
	if (!Cmd_brief_inited) {
		cmd_brief_exit();
		return;
	}

	if ( help_overlay_active(Cmd_brief_overlay_id) ) {
		Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_HELP].button.reset_status();
		Ui_window.set_ignore_gadgets(1);
	}

	k = Ui_window.process() & ~KEY_DEBUGGED;

	if ( (k > 0) || B1_JUST_RELEASED ) {
		if ( help_overlay_active(Cmd_brief_overlay_id) ) {
			help_overlay_set_state(Cmd_brief_overlay_id, gr_screen.res, 0);
			Ui_window.set_ignore_gadgets(0);
			k = 0;
		}
	}

	if ( !help_overlay_active(Cmd_brief_overlay_id) ) {
		Ui_window.set_ignore_gadgets(0);
	}

	switch (k) {
	case KEY_ESC:
		if (Game_mode & GM_MULTIPLAYER) {
			gamesnd_play_iface(InterfaceSounds::USER_SELECT);
			multi_quit_game(PROMPT_ALL);
		} else {
			common_music_close();
			gameseq_post_event(GS_EVENT_MAIN_MENU);
		}
		break;
	}	// end switch

	for (i=0; i<NUM_CMD_BRIEF_BUTTONS; i++){
		if (Cmd_brief_buttons[gr_screen.res][i].button.pressed()){
			cmd_brief_button_pressed(i);
		}
	}

	cmd_brief_voice_play(Cur_stage);
	common_music_do();

	if (cmd_brief_check_stage_done() && Player->auto_advance && (Cur_stage < Cur_cmd_brief->num_stages - 1)){
		if((Cur_Anim.num_frames <= 1) || Cur_Anim.done_playing) {
			cmd_brief_new_stage(Cur_stage + 1);
		}
	}

	GR_MAYBE_CLEAR_RES(Cmd_brief_background_bitmap);
	if (Cmd_brief_background_bitmap >= 0) {
		gr_set_bitmap(Cmd_brief_background_bitmap);
		gr_bitmap(0, 0, GR_RESIZE_MENU);
	} 

	if(Cur_Anim.num_frames > 0) {
		bm_get_info((Cur_Anim.streaming) ? Cur_Anim.bitmap_id : Cur_Anim.first_frame, &x, &y, NULL, NULL, NULL);
		x = Cmd_image_center_coords[gr_screen.res][CMD_X_COORD] - x / 2;
		y = Cmd_image_center_coords[gr_screen.res][CMD_Y_COORD] - y / 2;
		generic_anim_render(&Cur_Anim, (Cmd_brief_paused) ? 0 : frametime, x, y, true);
	}

	Ui_window.draw();

	if (!Player->auto_advance){
		Cmd_brief_buttons[gr_screen.res][CMD_BRIEF_BUTTON_PAUSE].button.draw_forced(2);
	}

	font::set_font(font::FONT1);
	gr_set_color_fast(&Color_text_heading);

	sprintf(buf, XSTR( "Stage %d of %d", 464), Cur_stage + 1, Cur_cmd_brief->num_stages);
	gr_get_string_size(&w, NULL, buf);
	gr_string(Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_X_COORD] + Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_W_COORD] - w, Cmd_stage_y[gr_screen.res], buf, GR_RESIZE_MENU);

	if (brief_render_text(Top_cmd_brief_text_line, Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_X_COORD], Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_Y_COORD], Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_H_COORD], frametime, 0, 1)){
		Voice_good_to_go = 1;
	}

	Max_cmdbrief_Lines = Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_H_COORD]/(gr_get_font_height() + 1); //Make the max number of lines dependent on the font height, keeping in mind that we have an extra pixel between lines.

	// maybe output the "more" indicator
	if ( (Max_cmdbrief_Lines + Top_cmd_brief_text_line) < Num_brief_text_lines[0] ) {
		// can be scrolled down
		int more_txt_x = Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_X_COORD] + (Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_W_COORD]/2) - 10;
		int more_txt_y = Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_Y_COORD] + Cmd_text_wnd_coords[Uses_scroll_buttons][gr_screen.res][CMD_H_COORD] - 2;				// located below brief text, centered

		gr_get_string_size(&w, &h, XSTR("more", 1469), static_cast<int>(strlen(XSTR("more", 1469))));
		gr_set_color_fast(&Color_black);
		gr_rect(more_txt_x-2, more_txt_y, w+3, h, GR_RESIZE_MENU);
		gr_set_color_fast(&Color_more_indicator);
		gr_string(more_txt_x, more_txt_y, XSTR("more", 1469), GR_RESIZE_MENU);  // base location on the input x and y?
	}

	// blit help overlay if active
	help_overlay_maybe_blit(Cmd_brief_overlay_id, gr_screen.res);

	gr_flip();
}

int mission_has_cmd_brief()
{
	return (Cur_cmd_brief != NULL && Cur_cmd_brief->num_stages > 0);
}