#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_MENU
};
enum prompt_mode pm;

enum menu {
	MENU_MAIN,
	MENU_MATCH_OPTS,
	MENU_START_PTS,
	MENU_THROWS_FIRST
};
static enum menu menu_stack[10];
static int menu_depth = 0;
static char *list_optv[10];
static int list_optc;
static bool list_back;

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));
}

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_MENU ? "#keypad-list" :
			"#keypad-default",
		"visible", ".keypad");
}

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

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 menu_display_main()
{
	prompt_set_msgl("Select match mode:");

	add_list_opt("Play against computer");
	add_list_opt("One-player scoreboard");
	add_list_opt("Two-player scoreboard");
	add_list_opt("Computer vs computer");
	add_list_opt("Three-player scoreboard");
	add_list_opt("Play against three computers");
}

void menu_display_match_opts()
{
	prompt_set_msgl("Match options:");

	char buf[64];
	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);

	list_back = true;
}

void menu_display_start_pts()
{
	prompt_set_msgl("Starting points:");

	add_list_opt("301");
	add_list_opt("501");
	add_list_opt("701");
	add_list_opt("901");

	list_back = true;
}

void menu_display_throws_first()
{
	prompt_set_msgl("Throws first:");

	add_list_opt(match_opts->p1_name);
	if (match_opts->p2_name)
		add_list_opt(match_opts->p2_name);

	list_back = true;
}

void menu_display()
{
	if (pm != PM_MENU)
		set_prompt_mode(PM_MENU);

	prompt_set_msgl(NULL);
	prompt_set_msgr(NULL);
	clear_list_opts();

	switch (menu_stack[menu_depth]) {
	case MENU_MAIN:
		menu_display_main();
		break;
	case MENU_MATCH_OPTS:
		menu_display_match_opts();
		break;
	case MENU_START_PTS:
		menu_display_start_pts();
		break;
	case MENU_THROWS_FIRST:
		menu_display_throws_first();
		break;
	}

	if (list_back)
		add_list_opt("Back");

	flush_list_opts();
	prompt_flush();
}

static void menu_pop()
{
	--menu_depth;
	menu_display();
}

static void menu_push(enum menu m)
{
	menu_stack[++menu_depth] = m;
	menu_display();
}

void menu_submit_main(int mode)
{
	if (mode < M_FIRST || mode > M_LAST) {
		oi();
		return;
	}

	if (match_opts) match_opts_free();
	match_opts = calloc(1, sizeof(*match_opts));
	match_opts->mode = mode;
	match_opts->start_pts = 501;
	match_opts->throws_first = 1;
	// names need to be freed if we stop using string literals
	if (mode == M_PVC) {
		match_opts->p1_name = "User";
		match_opts->p2_name = "Computer";
		match_opts->p2_type = PT_COMP;
	} else if (mode == M_P) {
		match_opts->p1_name = "Player 1";
		match_opts->p2_name = NULL;
	} else if (mode == M_PVP) {
		match_opts->p1_name = "Player 1";
		match_opts->p2_name = "Player 2";
	} else if (mode == M_CVC) {
		match_opts->p1_name = "Computer 1";
		match_opts->p1_type = PT_COMP;
		match_opts->p2_name = "Computer 2";
		match_opts->p2_type = PT_COMP;
	} else if (mode == M_PVPVP) {
		match_opts->p1_name = "Player 1";
		match_opts->p2_name = "Player 2";
	} else if (mode == M_PVCVCVC) {
		match_opts->p1_name = "User";
		match_opts->p2_type = PT_COMP;
		match_opts->p2_name = "Computer 1";
	}

	menu_push(MENU_MATCH_OPTS);
}

static void menu_submit_match_opts(int val)
{
	if (val == 1)
		start_match();
	else if (val == 2)
		menu_push(MENU_START_PTS);
	else if (val == 3)
		menu_push(MENU_THROWS_FIRST);
}

static void menu_submit_start_pts(int val)
{
	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;

	menu_pop();
}

static void menu_submit_throws_first(int val)
{
	match_opts->throws_first = val;

	menu_pop();
}

static void menu_submit(int opt)
{
	if (opt < 1 || opt > list_optc) {
		oi();
		return;
	}

	if (list_back && opt == list_optc) {
		menu_pop();
		return;
	}

	switch (menu_stack[menu_depth]) {
	case MENU_MAIN:
		menu_submit_main(opt);
		break;
	case MENU_MATCH_OPTS:
		menu_submit_match_opts(opt);
		break;
	case MENU_START_PTS:
		menu_submit_start_pts(opt);
		break;
	case MENU_THROWS_FIRST:
		menu_submit_throws_first(opt);
		break;
	}
}

void prompt_main_menu()
{
	scoreboard_hide_info();
	dom_set_content("#visits", NULL);

	menu_depth = 0;
	menu_stack[0] = MENU_MAIN;

	menu_display();
}

void prompt_user_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_comp_visit()
{
	set_prompt_mode(PM_DARTBOARD);

	char buf[64];
	sprintf(buf, "%s is throwing…", state_active_leg()->name);
	prompt_set_msgl(buf);
	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(0);

	char buf[64];
	sprintf(buf, "%s wins.",
		state->legs[match_winning_player() - 1]->name);

	set_prompt_mode(PM_END_MATCH);
	prompt_set_msgl(buf);
	prompt_set_msgr(NULL);

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

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_MENU &&
		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_MENU)
		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_MENU)
			menu_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"))
		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();
}