/*  execute.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/>.
 *
 */

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

#include "api.h"
#include "chat_commands.h"
#include "execute.h"
#include "global_commands.h"
#include "conference_commands.h"
#include "line_info.h"
#include "misc_tools.h"
#include "notify.h"
#include "toxic.h"
#include "windows.h"

struct cmd_func {
    const char *name;
    void (*func)(WINDOW *w, ToxWindow *, Tox *m, int argc, char (*argv)[MAX_STR_SIZE]);
};

static struct cmd_func global_commands[] = {
    { "/accept",    cmd_accept        },
    { "/add",       cmd_add           },
    { "/avatar",    cmd_avatar        },
    { "/clear",     cmd_clear         },
    { "/connect",   cmd_connect       },
    { "/decline",   cmd_decline       },
    { "/exit",      cmd_quit          },
    { "/conference", cmd_conference    },
#ifdef GAMES
    { "/game",      cmd_game          },
#endif
    { "/help",      cmd_prompt_help   },
    { "/log",       cmd_log           },
    { "/myid",      cmd_myid          },
#ifdef QRCODE
    { "/myqr",      cmd_myqr          },
#endif /* QRCODE */
    { "/nick",      cmd_nick          },
    { "/note",      cmd_note          },
    { "/nospam",    cmd_nospam        },
    { "/q",         cmd_quit          },
    { "/quit",      cmd_quit          },
    { "/requests",  cmd_requests      },
    { "/status",    cmd_status        },
#ifdef AUDIO
    { "/lsdev",     cmd_list_devices  },
    { "/sdev",      cmd_change_device },
#endif /* AUDIO */
#ifdef VIDEO
    { "/lsvdev",    cmd_list_video_devices  },
    { "/svdev",     cmd_change_video_device },
#endif /* VIDEO */
#ifdef PYTHON
    { "/run",       cmd_run           },
#endif /* PYTHON */
    { NULL,         NULL              },
};

static struct cmd_func chat_commands[] = {
    { "/cancel",    cmd_cancelfile        },
    { "/invite",    cmd_conference_invite },
    { "/join",      cmd_conference_join   },
#ifdef GAMES
    { "/play",      cmd_game_join         },
#endif
    { "/savefile",  cmd_savefile          },
    { "/sendfile",  cmd_sendfile          },
#ifdef AUDIO
    { "/call",      cmd_call              },
    { "/answer",    cmd_answer            },
    { "/reject",    cmd_reject            },
    { "/hangup",    cmd_hangup            },
    { "/mute",      cmd_mute              },
    { "/sense",     cmd_sense             },
    { "/bitrate",   cmd_bitrate           },
#endif /* AUDIO */
#ifdef VIDEO
    { "/vcall",     cmd_vcall             },
    { "/video",     cmd_video             },
    { "/res",       cmd_res               },
#endif /* VIDEO */
    { NULL,         NULL                  },
};

static struct cmd_func conference_commands[] = {
    { "/title",     cmd_conference_set_title },

#ifdef AUDIO
    { "/audio",     cmd_enable_audio },
    { "/mute",      cmd_conference_mute   },
    { "/ptt",       cmd_conference_push_to_talk },
    { "/sense",     cmd_conference_sense  },
#endif /* AUDIO */
    { NULL,         NULL             },
};


#ifdef PYTHON
#define SPECIAL_COMMANDS 8
#else
#define SPECIAL_COMMANDS 7
#endif /* PYTHON */

/* Special commands are commands that only take one argument even if it contains spaces */
static const char special_commands[SPECIAL_COMMANDS][MAX_CMDNAME_SIZE] = {
    "/add",
    "/avatar",
    "/nick",
    "/note",
#ifdef PYTHON
    "/run",
#endif /* PYTHON */
    "/sendfile",
    "/title",
    "/mute",
};

/* Returns true if input command is in the special_commands array. */
static bool is_special_command(const char *input)
{
    const int s = char_find(0, input, ' ');

    for (int i = 0; i < SPECIAL_COMMANDS; ++i) {
        if (strncmp(input, special_commands[i], s) == 0) {
            return true;
        }
    }

    return false;
}

/* Parses commands in the special_commands array. Unlike parse_command, this function
 * does not split the input string at spaces.
 *
 * Returns the number of arguments.
 */
static int parse_special_command(const char *input, char (*args)[MAX_STR_SIZE])
{
    int len = strlen(input);
    int s = char_find(0, input, ' ');

    memcpy(args[0], input, s);
    args[0][s++] = '\0';    // increment to remove space after "/command "

    if (s >= len) {
        return 1;  // No additional args
    }

    memcpy(args[1], input + s, len - s);
    args[1][len - s] = '\0';

    return 2;
}

/* Parses input command and puts args into arg array.
 *
 * Returns the number of arguments.
 */
static int parse_command(const char *input, char (*args)[MAX_STR_SIZE])
{
    if (is_special_command(input)) {
        return parse_special_command(input, args);
    }

    char *cmd = strdup(input);

    if (cmd == NULL) {
        exit_toxic_err("failed in parse_command", FATALERR_MEMORY);
    }

    int num_args = 0;

    /* characters wrapped in double quotes count as one arg */
    while (num_args < MAX_NUM_ARGS) {
        int i = char_find(0, cmd, ' ');    // index of last char in an argument
        memcpy(args[num_args], cmd, i);
        args[num_args++][i] = '\0';

        if (cmd[i] == '\0') {  // no more args
            break;
        }

        char tmp[MAX_STR_SIZE];
        snprintf(tmp, sizeof(tmp), "%s", &cmd[i + 1]);
        strcpy(cmd, tmp);    // tmp will always fit inside cmd
    }

    free(cmd);
    return num_args;
}

/* Matches command to respective function.
 *
 * Returns 0 on match.
 * Returns 1 on no match
 */
static int do_command(WINDOW *w, ToxWindow *self, Tox *m, int num_args, struct cmd_func *commands,
                      char (*args)[MAX_STR_SIZE])
{
    for (size_t i = 0; commands[i].name != NULL; ++i) {
        if (strcmp(args[0], commands[i].name) == 0) {
            (commands[i].func)(w, self, m, num_args - 1, args);
            return 0;
        }
    }

    return 1;
}

void execute(WINDOW *w, ToxWindow *self, Tox *m, const char *input, int mode)
{
    if (string_is_empty(input)) {
        return;
    }

    char args[MAX_NUM_ARGS][MAX_STR_SIZE];
    int num_args = parse_command(input, args);

    if (num_args <= 0) {
        return;
    }

    /* Try to match input command to command functions. If non-global command mode is specified,
     * try specified mode's commands first, then upon failure try global commands.
     *
     * Note: Global commands must come last in case of duplicate command names
     */
    switch (mode) {
        case CHAT_COMMAND_MODE:
            if (do_command(w, self, m, num_args, chat_commands, args) == 0) {
                return;
            }

            break;

        case CONFERENCE_COMMAND_MODE:
            if (do_command(w, self, m, num_args, conference_commands, args) == 0) {
                return;
            }

            break;
    }

    if (do_command(w, self, m, num_args, global_commands, args) == 0) {
        return;
    }

#ifdef PYTHON

    if (do_plugin_command(num_args, args) == 0) {
        return;
    }

#endif

    line_info_add(self, false, NULL, NULL, SYS_MSG, 0, 0, "Invalid command.");
}
