/*  groupchat.c
 *
 *
 *  Copyright (C) 2014 Toxic All Rights Reserved.
 *
 *  This file is part of Toxic.
 *
 *  Toxic 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.
 *
 *  Toxic is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Toxic.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef _GNU_SOURCE
#define _GNU_SOURCE    /* needed for strcasestr() and wcswidth() */
#endif

#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <wchar.h>

#include "windows.h"
#include "toxic.h"
#include "execute.h"
#include "misc_tools.h"
#include "groupchat.h"
#include "prompt.h"
#include "toxic_strings.h"
#include "log.h"
#include "line_info.h"
#include "settings.h"
#include "input.h"
#include "help.h"
#include "notify.h"
#include "autocomplete.h"

extern char *DATA_FILE;

static GroupChat groupchats[MAX_GROUPCHAT_NUM];
static int max_groupchat_index = 0;

extern struct user_settings *user_settings_;

/* temporary until group chats have unique commands */
extern const char glob_cmd_list[AC_NUM_GLOB_COMMANDS][MAX_CMDNAME_SIZE];

int init_groupchat_win(ToxWindow *prompt, Tox *m, int groupnum)
{
    if (groupnum > MAX_GROUPCHAT_NUM)
        return -1;

    int i;

    for (i = 0; i <= max_groupchat_index; ++i) {
        if (!groupchats[i].active) {
            groupchats[i].chatwin = add_window(m, new_group_chat(m, groupnum));
            groupchats[i].active = true;
            groupchats[i].num_peers = 0;
            groupchats[i].peer_names = malloc(sizeof(uint8_t) * TOX_MAX_NAME_LENGTH);
            groupchats[i].oldpeer_names = malloc(sizeof(uint8_t) * TOX_MAX_NAME_LENGTH);
            groupchats[i].peer_name_lengths = malloc(sizeof(uint16_t));
            groupchats[i].oldpeer_name_lengths = malloc(sizeof(uint16_t));

            memcpy(&groupchats[i].oldpeer_names[0], UNKNOWN_NAME, sizeof(UNKNOWN_NAME));
            groupchats[i].oldpeer_name_lengths[0] = (uint16_t) strlen(UNKNOWN_NAME);

            set_active_window(groupchats[i].chatwin);

            if (i == max_groupchat_index)
                ++max_groupchat_index;

            return 0;
        }
    }

    return -1;
}

void kill_groupchat_window(ToxWindow *self)
{
    ChatContext *ctx = self->chatwin;

    log_disable(ctx->log);
    line_info_cleanup(ctx->hst);
    delwin(ctx->linewin);
    delwin(ctx->history);
    delwin(ctx->sidebar);
    free(ctx->log);
    free(ctx->hst);
    free(ctx);
    free(self->help);
    del_window(self);
}

static void close_groupchat(ToxWindow *self, Tox *m, int groupnum)
{
    tox_del_groupchat(m, groupnum);

    free(groupchats[groupnum].peer_names);
    free(groupchats[groupnum].oldpeer_names);
    free(groupchats[groupnum].peer_name_lengths);
    free(groupchats[groupnum].oldpeer_name_lengths);
    memset(&groupchats[groupnum], 0, sizeof(GroupChat));

    int i;

    for (i = max_groupchat_index; i > 0; --i) {
        if (groupchats[i - 1].active)
            break;
    }

    max_groupchat_index = i;
    kill_groupchat_window(self);
}

static void groupchat_onGroupMessage(ToxWindow *self, Tox *m, int groupnum, int peernum,
                                     const char *msg, uint16_t len)
{
    if (self->num != groupnum)
        return;

    ChatContext *ctx = self->chatwin;

    char nick[TOX_MAX_NAME_LENGTH];
    int n_len = tox_group_peername(m, groupnum, peernum, (uint8_t *) nick);
    n_len = MIN(n_len, TOXIC_MAX_NAME_LENGTH - 1);  /* enforce client max name length */
    nick[n_len] = '\0';

    char selfnick[TOX_MAX_NAME_LENGTH];
    uint16_t sn_len = tox_get_self_name(m, (uint8_t *) selfnick);
    selfnick[sn_len] = '\0';

    int nick_clr = strcmp(nick, selfnick) == 0 ? GREEN : CYAN;

    /* Only play sound if mentioned */
    if (strcasestr(msg, selfnick) && strncmp(selfnick, nick, TOXIC_MAX_NAME_LENGTH - 1)) {
        notify(self, generic_message, NT_WNDALERT_0);
        nick_clr = RED;
    }
    else notify(self, silent, NT_WNDALERT_1);

    char timefrmt[TIME_STR_SIZE];
    get_time_str(timefrmt, sizeof(timefrmt));

    line_info_add(self, timefrmt, nick, NULL, IN_MSG, 0, nick_clr, msg);
    write_to_log(msg, nick, ctx->log, false);
}

static void groupchat_onGroupAction(ToxWindow *self, Tox *m, int groupnum, int peernum, const char *action,
                                    uint16_t len)
{
    if (self->num != groupnum)
        return;

    ChatContext *ctx = self->chatwin;

    char selfnick[TOX_MAX_NAME_LENGTH];
    uint16_t n_len = tox_get_self_name(m, (uint8_t *) selfnick);
    selfnick[n_len] = '\0';

    if (strcasestr(action, selfnick)) {
        notify(self, generic_message, NT_WNDALERT_0);
    }
    else notify(self, silent, NT_WNDALERT_1);

    char nick[TOX_MAX_NAME_LENGTH];
    n_len = tox_group_peername(m, groupnum, peernum, (uint8_t *) nick);
    n_len = MIN(n_len, TOXIC_MAX_NAME_LENGTH - 1);
    nick[n_len] = '\0';

    char timefrmt[TIME_STR_SIZE];
    get_time_str(timefrmt, sizeof(timefrmt));

    line_info_add(self, timefrmt, nick, NULL, ACTION, 0, 0, action);
    write_to_log(action, nick, ctx->log, true);
}

/* Puts two copies of peerlist/lengths in chat instance */
static void copy_peernames(int gnum, uint8_t peerlist[][TOX_MAX_NAME_LENGTH], uint16_t lengths[], int npeers)
{
    /* Assumes these are initiated in init_groupchat_win */
    free(groupchats[gnum].peer_names);
    free(groupchats[gnum].oldpeer_names);
    free(groupchats[gnum].peer_name_lengths);
    free(groupchats[gnum].oldpeer_name_lengths);

    int N = TOX_MAX_NAME_LENGTH;

    groupchats[gnum].peer_names = malloc(sizeof(uint8_t) * npeers * N);
    groupchats[gnum].oldpeer_names = malloc(sizeof(uint8_t) * npeers * N);
    groupchats[gnum].peer_name_lengths = malloc(sizeof(uint16_t) * npeers);
    groupchats[gnum].oldpeer_name_lengths = malloc(sizeof(uint16_t) * npeers);

    if (groupchats[gnum].peer_names == NULL || groupchats[gnum].oldpeer_names == NULL
        || groupchats[gnum].peer_name_lengths == NULL || groupchats[gnum].oldpeer_name_lengths == NULL) {
        exit_toxic_err("failed in copy_peernames", FATALERR_MEMORY);
    }

    uint16_t unknown_len = (uint16_t) strlen(UNKNOWN_NAME);
    int i;

    for (i = 0; i < npeers; ++i) {
        if (string_is_empty((char *) peerlist[i])) {
            memcpy(&groupchats[gnum].peer_names[i * N], UNKNOWN_NAME, sizeof(UNKNOWN_NAME));
            groupchats[gnum].peer_name_lengths[i] = unknown_len;
        } else {
            memcpy(&groupchats[gnum].peer_names[i * N], peerlist[i], N);
            uint16_t n_len = lengths[i];

            n_len = MIN(n_len, TOXIC_MAX_NAME_LENGTH - 1);

            groupchats[gnum].peer_names[i * N + n_len] = '\0';
            groupchats[gnum].peer_name_lengths[i] = n_len;
        }
    }

    memcpy(groupchats[gnum].oldpeer_names, groupchats[gnum].peer_names, N * npeers);
    memcpy(groupchats[gnum].oldpeer_name_lengths, groupchats[gnum].peer_name_lengths,
           sizeof(uint16_t) * npeers);
}

static void groupchat_onGroupNamelistChange(ToxWindow *self, Tox *m, int groupnum, int peernum,
                                            uint8_t change)
{
    if (self->num != groupnum)
        return;

    if (groupnum > max_groupchat_index)
        return;

    groupchats[groupnum].num_peers = tox_group_number_peers(m, groupnum);
    int num_peers = groupchats[groupnum].num_peers;

    if (peernum > num_peers)
        return;

    /* get old peer name before updating name list */
    uint8_t oldpeername[TOX_MAX_NAME_LENGTH];

    if (change != TOX_CHAT_CHANGE_PEER_ADD) {
        memcpy(oldpeername, &groupchats[groupnum].oldpeer_names[peernum * TOX_MAX_NAME_LENGTH],
               sizeof(oldpeername));
        uint16_t old_n_len = groupchats[groupnum].oldpeer_name_lengths[peernum];
        oldpeername[old_n_len] = '\0';
    }

    /* Update name/len lists */
    uint8_t tmp_peerlist[num_peers][TOX_MAX_NAME_LENGTH];
    uint16_t tmp_peerlens[num_peers];
    tox_group_get_names(m, groupnum, tmp_peerlist, tmp_peerlens, num_peers);
    copy_peernames(groupnum, tmp_peerlist, tmp_peerlens, num_peers);

    /* get current peername then sort namelist */
    uint8_t peername[TOX_MAX_NAME_LENGTH];

    if (change != TOX_CHAT_CHANGE_PEER_DEL) {
        uint16_t n_len = groupchats[groupnum].peer_name_lengths[peernum];
        memcpy(peername, &groupchats[groupnum].peer_names[peernum * TOX_MAX_NAME_LENGTH], sizeof(peername));
        peername[n_len] = '\0';
    }

    qsort(groupchats[groupnum].peer_names, groupchats[groupnum].num_peers, TOX_MAX_NAME_LENGTH, qsort_strcasecmp_hlpr);

    ChatContext *ctx = self->chatwin;

    char *event;
    char timefrmt[TIME_STR_SIZE];
    get_time_str(timefrmt, sizeof(timefrmt));

    switch (change) {
        case TOX_CHAT_CHANGE_PEER_ADD:
            event = "has joined the room";
            line_info_add(self, timefrmt, (char *) peername, NULL, CONNECTION, 0, GREEN, event);
            write_to_log(event, (char *) peername, ctx->log, true);
            break;

        case TOX_CHAT_CHANGE_PEER_DEL:
            event = "has left the room";
            line_info_add(self, timefrmt, (char *) oldpeername, NULL, CONNECTION, 0, 0, event);

            if (groupchats[self->num].side_pos > 0)
                --groupchats[self->num].side_pos;

            write_to_log(event, (char *) oldpeername, ctx->log, true);
            break;

        case TOX_CHAT_CHANGE_PEER_NAME:
            event = " is now known as ";
            line_info_add(self, timefrmt, (char *) oldpeername, (char *) peername, NAME_CHANGE, 0, 0, event);

            char tmp_event[TOXIC_MAX_NAME_LENGTH * 2 + 32];
            snprintf(tmp_event, sizeof(tmp_event), "is now known as %s", (char *) peername);
            write_to_log(tmp_event, (char *) oldpeername, ctx->log, true);
            break;
    }

    notify(self, silent, NT_WNDALERT_2);
}

static void send_group_action(ToxWindow *self, ChatContext *ctx, Tox *m, char *action)
{
    if (action == NULL) {
        wprintw(ctx->history, "Invalid syntax.\n");
        return;
    }

    if (tox_group_action_send(m, self->num, (uint8_t *) action, strlen(action)) == -1) {
        char *errmsg = " * Failed to send action.";
        line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, RED, errmsg);
    }
}

static void groupchat_onKey(ToxWindow *self, Tox *m, wint_t key, bool ltr)
{
    ChatContext *ctx = self->chatwin;

    int x, y, y2, x2;
    getyx(self->window, y, x);
    getmaxyx(self->window, y2, x2);

    if (x2 <= 0)
        return;

    if (self->help->active) {
        help_onKey(self, key);
        return;
    }

    if (ltr) {    /* char is printable */
        input_new_char(self, key, x, y, x2, y2);
        return;
    }

    if (line_info_onKey(self, key))
        return;

    if (input_handle(self, key, x, y, x2, y2))
        return;

    if (key == '\t') {  /* TAB key: auto-completes peer name or command */
        if (ctx->len > 0) {
            int diff;

            if ((ctx->line[0] != '/') || (ctx->line[1] == 'm' && ctx->line[2] == 'e'))
                diff = complete_line(self, groupchats[self->num].peer_names,
                                         groupchats[self->num].num_peers, TOX_MAX_NAME_LENGTH);
            else
                diff = complete_line(self, glob_cmd_list, AC_NUM_GLOB_COMMANDS, MAX_CMDNAME_SIZE);

            if (diff != -1) {
                if (x + diff > x2 - 1) {
                    int wlen = wcswidth(ctx->line, sizeof(ctx->line));
                    ctx->start = wlen < x2 ? 0 : wlen - x2 + 1;
                }
            } else {
                notify(self, error, 0);
            }
        } else {
            notify(self, error, 0);
        }
    } else if (key == T_KEY_C_RB) {    /* Scroll peerlist up and down one position */
        int L = y2 - CHATBOX_HEIGHT - SDBAR_OFST;

        if (groupchats[self->num].side_pos < groupchats[self->num].num_peers - L)
            ++groupchats[self->num].side_pos;
    } else if (key == T_KEY_C_LB) {
        if (groupchats[self->num].side_pos > 0)
            --groupchats[self->num].side_pos;
    } else if (key == '\n') {
        rm_trailing_spaces_buf(ctx);

        char line[MAX_STR_SIZE];

        if (wcs_to_mbs_buf(line, ctx->line, MAX_STR_SIZE) == -1)
            memset(&line, 0, sizeof(line));

        if (!string_is_empty(line))
            add_line_to_hist(ctx);

        if (line[0] == '/') {
            if (strcmp(line, "/close") == 0) {
                close_groupchat(self, m, self->num);
                return;
            } else if (strncmp(line, "/me ", strlen("/me ")) == 0) {
                send_group_action(self, ctx, m, line + strlen("/me "));
            } else {
                execute(ctx->history, self, m, line, GROUPCHAT_COMMAND_MODE);
            }
        } else if (!string_is_empty(line)) {
            if (tox_group_message_send(m, self->num, (uint8_t *) line, strlen(line)) == -1) {
                char *errmsg = " * Failed to send message.";
                line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, RED, errmsg);
            }
        }

        wclear(ctx->linewin);
        wmove(self->window, y2 - CURS_Y_OFFSET, 0);
        reset_buf(ctx);
    }
}

static void groupchat_onDraw(ToxWindow *self, Tox *m)
{
    int x2, y2;
    getmaxyx(self->window, y2, x2);

    ChatContext *ctx = self->chatwin;

    line_info_print(self);
    wclear(ctx->linewin);

    curs_set(1);

    if (ctx->len > 0)
        mvwprintw(ctx->linewin, 1, 0, "%ls", &ctx->line[ctx->start]);

    wclear(ctx->sidebar);

    mvwhline(self->window, y2 - CHATBOX_HEIGHT, 0, ACS_HLINE, x2);
    mvwvline(ctx->sidebar, 0, 0, ACS_VLINE, y2 - CHATBOX_HEIGHT);
    mvwaddch(ctx->sidebar, y2 - CHATBOX_HEIGHT, 0, ACS_BTEE);

    int num_peers = groupchats[self->num].num_peers;

    wmove(ctx->sidebar, 0, 1);
    wattron(ctx->sidebar, A_BOLD);
    wprintw(ctx->sidebar, "Peers: %d\n", num_peers);
    wattroff(ctx->sidebar, A_BOLD);

    mvwaddch(ctx->sidebar, 1, 0, ACS_LTEE);
    mvwhline(ctx->sidebar, 1, 1, ACS_HLINE, SIDEBAR_WIDTH - 1);

    int N = TOX_MAX_NAME_LENGTH;
    int maxlines = y2 - SDBAR_OFST - CHATBOX_HEIGHT;
    int i;

    for (i = 0; i < num_peers && i < maxlines; ++i) {
        wmove(ctx->sidebar, i + 2, 1);
        int peer = i + groupchats[self->num].side_pos;

        /* truncate nick to fit in side panel without modifying list */
        char tmpnck[TOX_MAX_NAME_LENGTH];
        memcpy(tmpnck, &groupchats[self->num].peer_names[peer * N], SIDEBAR_WIDTH - 2);
        tmpnck[SIDEBAR_WIDTH - 2] = '\0';

        wprintw(ctx->sidebar, "%s\n", tmpnck);
    }

    int y, x;
    getyx(self->window, y, x);
    (void) x;
    int new_x = ctx->start ? x2 - 1 : wcswidth(ctx->line, ctx->pos);
    wmove(self->window, y + 1, new_x);

    wrefresh(self->window);

    if (self->help->active)
        help_onDraw(self);
}

static void groupchat_onInit(ToxWindow *self, Tox *m)
{
    int x2, y2;
    getmaxyx(self->window, y2, x2);

    ChatContext *ctx = self->chatwin;

    ctx->history = subwin(self->window, y2 - CHATBOX_HEIGHT + 1, x2 - SIDEBAR_WIDTH - 1, 0, 0);
    ctx->linewin = subwin(self->window, CHATBOX_HEIGHT, x2, y2 - CHATBOX_HEIGHT, 0);
    ctx->sidebar = subwin(self->window, y2 - CHATBOX_HEIGHT + 1, SIDEBAR_WIDTH, 0, x2 - SIDEBAR_WIDTH);

    ctx->hst = calloc(1, sizeof(struct history));
    ctx->log = calloc(1, sizeof(struct chatlog));

    if (ctx->log == NULL || ctx->hst == NULL)
        exit_toxic_err("failed in groupchat_onInit", FATALERR_MEMORY);

    line_info_init(ctx->hst);

    if (user_settings_->autolog == AUTOLOG_ON)
        log_enable(self->name, NULL, ctx->log);

    execute(ctx->history, self, m, "/log", GLOBAL_COMMAND_MODE);

    scrollok(ctx->history, 0);
    wmove(self->window, y2 - CURS_Y_OFFSET, 0);
}

ToxWindow new_group_chat(Tox *m, int groupnum)
{
    ToxWindow ret;
    memset(&ret, 0, sizeof(ret));

    ret.active = true;
    ret.is_groupchat = true;

    ret.onKey = &groupchat_onKey;
    ret.onDraw = &groupchat_onDraw;
    ret.onInit = &groupchat_onInit;
    ret.onGroupMessage = &groupchat_onGroupMessage;
    ret.onGroupNamelistChange = &groupchat_onGroupNamelistChange;
    ret.onGroupAction = &groupchat_onGroupAction;

    snprintf(ret.name, sizeof(ret.name), "Group %d", groupnum);

    ChatContext *chatwin = calloc(1, sizeof(ChatContext));
    Help *help = calloc(1, sizeof(Help));

    if (chatwin == NULL || help == NULL)
        exit_toxic_err("failed in new_group_chat", FATALERR_MEMORY);

    ret.chatwin = chatwin;
    ret.help = help;

    ret.num = groupnum;

    return ret;
}
