#include "web_control.h"
#include "web_dom.h"
#include "web_prompt.h"
#include "web_match.h"
#include "web_misc.h"
#include "web_scoreboard.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <emscripten/emscripten.h>

int oi_timeout;

enum prompt_mode {
	PM_DARTBOARD,
	PM_VISIT,
	PM_NUM_DARTS,
	PM_END_MATCH,
	PM_SELECT_MODE,
	PM_MATCH_OPTS,
	PM_MATCH_OPT_START_PTS,
	PM_MATCH_OPT_THROWS_FIRST
};
enum prompt_mode pm;

static char *list_optv[10];
static int list_optc;

static struct {
	bufstr msgl, msgr, input;
} bufs;

void oi()
{
	dom_add_class("#oi", "visible");
	oi_timeout = EM_ASM_INT({return scheduleCCall($0, $1)},
		"clear_oi", 3000);
}

EMSCRIPTEN_KEEPALIVE
void clear_oi()
{
	if (!oi_timeout) return;

	dom_remove_class("#oi", "visible");
	EM_ASM({clearTimeout($0)}, oi_timeout);
	oi_timeout = 0;
}

void prompt_set_msgl(char *str)
{
	bufstr_buf(&bufs.msgl, str);
}

void prompt_set_msgr(char *str)
{
	bufstr_buf(&bufs.msgr, str);
}

void prompt_set_input(char *str)
{
	bufstr_buf(&bufs.input, str);
}

void prompt_flush()
{
	if (bufstr_changed(&bufs.msgl))
		dom_set_content("#prompt-msg-l", bufstr_flush(&bufs.msgl));
	if (bufstr_changed(&bufs.msgr))
		dom_set_content("#prompt-msg-r", bufstr_flush(&bufs.msgr));
	if (bufstr_changed(&bufs.input))
		dom_set_content("#prompt-input", bufstr_flush(&bufs.input));
}

static void clear_list_opts()
{
	for (int i = 0; i < list_optc; ++i)
		free(list_optv[i]);
	list_optc = 0;
}

static void add_list_opt(char *str)
{
	list_optv[list_optc++] = strdup(str);
}

static void flush_list_opts()
{
	struct dom_elem **elemv = malloc(list_optc * sizeof(*elemv));

	for (int i = 0; i < list_optc; ++i) {
		struct dom_elem *e = dom_elem_init(NULL, "div", 2);
		dom_elem_add_attr(e, "class", "key");

		char buf[64];
		sprintf(buf, "append:%d;submit", i + 1);
		dom_elem_add_attr(e, "data-command", buf);

		struct dom_elem *child;
		child = dom_elem_init(NULL, "span", 1);
		asprintf(&child->content, "[%d]", i + 1);
		dom_elem_add_attr(child, "class", "keyboard-val");
		dom_elem_add_child(e, child);

		sprintf(buf, "\u2002%s", list_optv[i]);
		child = dom_text_init(buf);
		dom_elem_add_child(e, child);

		elemv[i] = e;
	}

	dom_set_content("#keypad-list", NULL);
	dom_append_elemv("#keypad-list", list_optc, elemv);

	for (int i = 0; i < list_optc; ++i)
		dom_elem_free(elemv[i]);
	free(elemv);
}

void set_prompt_mode(enum prompt_mode mode)
{
	pm = mode;

	if (pm != PM_DARTBOARD)
		dom_add_class("#prompt", "active");
	else
		dom_remove_class("#prompt", "active");

	dom_set_uniq_class(
		pm == PM_DARTBOARD ? "#keypad-dartboard" :
			pm == PM_SELECT_MODE ? "#keypad-list" :
			pm == PM_MATCH_OPTS ? "#keypad-list" :
			pm == PM_MATCH_OPT_START_PTS ? "#keypad-list" :
			pm == PM_MATCH_OPT_THROWS_FIRST ? "#keypad-list" :
			"#keypad-default",
		"visible", ".keypad");
}

void prompt_visit()
{
	set_prompt_mode(PM_VISIT);
	prompt_set_msgl("Enter points:");
	prompt_set_msgr(NULL);

	dom_set_content("#key-submit", "OK");
	dom_set_content("#key-rem", "REMAINING");
}

void prompt_bot_visit()
{
	set_prompt_mode(PM_DARTBOARD);
	prompt_set_msgl("Computer is throwing…");
	prompt_set_msgr(NULL);
}

void prompt_num_darts()
{
	set_prompt_mode(PM_NUM_DARTS);
	prompt_set_msgl("Darts needed?");
	prompt_set_msgr(NULL);
	dom_set_content("#key-submit", "OK");
	dom_set_content("#key-rem", "REMAINING");
}

void prompt_end_match()
{
	scoreboard_set_player_active(-1);

	set_prompt_mode(PM_END_MATCH);
	prompt_set_msgl(
		state->mode == M_PVC && state->legs[1]->rem <= 0 ?
			"Computer wins. :(" : "You win! :)");
	prompt_set_msgr(NULL);

	dom_set_content("#key-submit", "END MATCH");
	dom_set_content("#key-rem", "REMATCH");
}

void prompt_select_mode()
{
	dom_set_uniq_class(NULL, "visible", "[id$=-info-inner]");
	for (int pn = 1; pn < 3; ++pn)
		clear_player_info(pn);
	dom_set_content("#visits", NULL);

	set_prompt_mode(PM_SELECT_MODE);
	prompt_set_msgl("Select match mode:");
	prompt_set_msgr(NULL);

	clear_list_opts();
	add_list_opt("Play against computer");
	add_list_opt("One-player scoreboard");
	add_list_opt("Two-player scoreboard");
	flush_list_opts();
}

void prompt_match_opts()
{
	set_prompt_mode(PM_MATCH_OPTS);
	prompt_set_msgl("Match options:");
	prompt_set_msgr(NULL);

	char buf[64];
	clear_list_opts();
	add_list_opt("Start match");
	sprintf(buf, "Starting points: %d", match_opts->start_pts);
	add_list_opt(buf);
	sprintf(buf, "Throws first: %s",
		match_opts->throws_first == 1 ?
			match_opts->p1_name :
			match_opts->p2_name);
	add_list_opt(buf);
	add_list_opt("Back");
	flush_list_opts();
}

void prompt_match_opt_start_pts()
{
	set_prompt_mode(PM_MATCH_OPT_START_PTS);
	prompt_set_msgl("Starting points:");
	prompt_set_msgr(NULL);
	prompt_flush();

	clear_list_opts();
	add_list_opt("301");
	add_list_opt("501");
	add_list_opt("701");
	add_list_opt("901");
	add_list_opt("Back");
	flush_list_opts();
}

static void match_opt_start_pts_submit(int val)
{
	if (val < 1 || val > list_optc) {
		oi();
		return;
	} else if (val == list_optc) {
		goto prompt_next;
	}

	if (val == 1)
		match_opts->start_pts = 301;
	else if (val == 2)
		match_opts->start_pts = 501;
	else if (val == 3)
		match_opts->start_pts = 701;
	else if (val == 4)
		match_opts->start_pts = 901;

prompt_next:
	prompt_match_opts();
	prompt_flush();
}

void prompt_match_opt_throws_first()
{
	set_prompt_mode(PM_MATCH_OPT_THROWS_FIRST);
	prompt_set_msgl("Throws first:");
	prompt_set_msgr(NULL);
	prompt_flush();

	clear_list_opts();
	add_list_opt(match_opts->p1_name);
	if (match_opts->p2_name)
		add_list_opt(match_opts->p2_name);
	add_list_opt("Back");
	flush_list_opts();
}

static void match_opt_throws_first_submit(int val)
{
	if (val < 1 || val > list_optc) {
		oi();
		return;
	} else if (val == list_optc) {
		goto prompt_next;
	}

	match_opts->throws_first = val;

prompt_next:
	prompt_match_opts();
	prompt_flush();
}

static void match_opts_submit(int val)
{
	if (val < 1 || val > list_optc) {
		oi();
		return;
	} else if (val == list_optc) {
		prompt_select_mode();
		prompt_flush();
	}

	if (val == 1)
		start_match();
	else if (val == 2)
		prompt_match_opt_start_pts();
	else if (val == 3)
		prompt_match_opt_throws_first();
}

bool key_is_active(char *k)
{
	char sel[64];
	sprintf(sel, "#key-%s", k);
	return dom_has_class(sel, "active");
}

void toggle_key(char *k)
{
	char sel[64];
	sprintf(sel, "#key-%s", k);
	dom_toggle_class(sel, "active");
}

void deactivate_key(char *k)
{
	char sel[64];
	sprintf(sel, "#key-%s", k);
	dom_remove_class(sel, "active");
}

char *prompt_get()
{
	return dom_get_content("#prompt-input");
}

void prompt_handle_pre(char *command)
{
	if (pm == PM_DARTBOARD)
		return;

	clear_oi();

	if ((pm == PM_VISIT || pm == PM_NUM_DARTS || pm == PM_END_MATCH) &&
		strcmp(command, "undo"))
		deactivate_key("undo");

	if (pm == PM_END_MATCH && strcmp(command, "rem"))
		deactivate_key("rem");

	if (pm == PM_END_MATCH && strcmp(command, "submit"))
		deactivate_key("submit");

	if (strcmp(command, "exit"))
		deactivate_key("exit");
}

void prompt_handle_on_change()
{
	prompt_flush();

	if (pm != PM_VISIT)
		return;

	char *str = prompt_get();
	update_user_rem_from_pts(atoi(str));
	free(str);
}

void prompt_handle_append(char *data)
{
	if (pm != PM_MATCH_OPTS &&
		pm != PM_MATCH_OPT_START_PTS &&
		pm != PM_MATCH_OPT_THROWS_FIRST &&
		pm != PM_SELECT_MODE &&
		pm != PM_VISIT &&
		pm != PM_NUM_DARTS)
		return;

	char *str = prompt_get();
	size_t len_str = strlen(str);
	size_t len_data = strlen(data);
	if (len_str < 3) {
		str = realloc(str, len_str + len_data + 1);
		memcpy(str + len_str, data, len_data + 1);
		prompt_set_input(str);
		prompt_handle_on_change();
	}
	free(str);
}

void prompt_handle_backspace()
{
	if (pm == PM_DARTBOARD)
		return;

	char *str = prompt_get();
	size_t len_str = strlen(str);
	if (len_str > 0) {
		str[len_str-1] = 0;
		prompt_set_input(str);
		prompt_handle_on_change();
	}
	free(str);
}

void prompt_handle_clear()
{
	if (pm == PM_DARTBOARD)
		return;

	prompt_set_input(NULL);
	prompt_handle_on_change();
}

void prompt_handle_submit()
{
	if (pm == PM_END_MATCH) {
		if (key_is_active("submit"))
			end_match();
		toggle_key("submit");
		return;
	}

	if (pm != PM_VISIT &&
		pm != PM_NUM_DARTS &&
		pm != PM_SELECT_MODE &&
		pm != PM_MATCH_OPTS &&
		pm != PM_MATCH_OPT_START_PTS &&
		pm != PM_MATCH_OPT_THROWS_FIRST)
		return;

	char *str = prompt_get();
	prompt_handle_clear();
	if (*str) {
		if (pm == PM_VISIT)
			user_visit(atoi(str));
		else if (pm == PM_NUM_DARTS)
			user_num_darts(atoi(str));
		else if (pm == PM_SELECT_MODE)
			match_mode_selected(atoi(str));
		else if (pm == PM_MATCH_OPTS)
			match_opts_submit(atoi(str));
		else if (pm == PM_MATCH_OPT_START_PTS)
			match_opt_start_pts_submit(atoi(str));
		else if (pm == PM_MATCH_OPT_THROWS_FIRST)
			match_opt_throws_first_submit(atoi(str));
	}

	free(str);
}

void prompt_handle_rem()
{
	if (pm == PM_END_MATCH) {
		if (key_is_active("rem"))
			start_match();
		toggle_key("rem");
		return;
	}

	if (pm != PM_VISIT)
		return;

	char *str = prompt_get();
	prompt_handle_clear();
	if (*str)
		user_visit_to_rem(atoi(str));
	free(str);
}

void prompt_handle_undo()
{
	if (pm != PM_VISIT && pm != PM_NUM_DARTS && pm != PM_END_MATCH)
		return;

	prompt_handle_clear();
	if (key_is_active("undo"))
		user_undo();
	toggle_key("undo");
}

void prompt_handle_exit()
{
	if (key_is_active("exit")) {
		// FIXME clear scheduled c calls (comp throwing)
		scoreboard_set_player_active(-1);
		end_match();
	}
	toggle_key("exit");
}

EMSCRIPTEN_KEEPALIVE
void prompt_handle(char *command, char *data)
{
	prompt_handle_pre(command);

	if (!strcmp(command, "append"))
		prompt_handle_append(data);
	else if (!strcmp(command, "backspace"))
		prompt_handle_backspace();
	else if (!strcmp(command, "clear"))
		prompt_handle_clear();
	else if (!strcmp(command, "submit"))
		prompt_handle_submit();
	else if (!strcmp(command, "rem"))
		prompt_handle_rem();
	else if (!strcmp(command, "undo"))
		prompt_handle_undo();
	else if (!strcmp(command, "exit"))
		prompt_handle_exit();
}