/**
 * rofi
 *
 * MIT/X11 License
 * Copyright 2013-2014 Qball  Cow <qball@gmpclient.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */


#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <strings.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include "rofi.h"
#include "script-dialog.h"



pid_t execute_generator ( char * cmd )
{
    int   filedes[2];
    pid_t pid;


    if ( -1 == pipe ( filedes ) ) {
        perror ( "pipe failed" );
        return 0;
    }

    switch ( pid = fork () )
    {
    case -1:
        perror ( "Failed to fork, executing generator failed" );
        pid = 0;
        break;

    case 0:       /* child */
        close ( 1 );
        dup ( filedes[1] );
        close ( filedes[1] );
        execlp ( "/bin/sh", "sh", "-c", cmd, NULL );
        perror ( cmd );
        break;

    default:     /* parent */
        close ( 0 );
        dup ( filedes[0] );
        close ( filedes[0] );
        close ( filedes[1] );
        break;
    }

    return pid;
}


static char **get_script_output ( char *command, unsigned int *length )
{
    char buffer[1024];
    char **retv = NULL;

    *length = 0;
    execute_generator ( command );
    while ( fgets ( buffer, 1024, stdin ) != NULL ) {
        char **tr = realloc ( retv, ( ( *length ) + 2 ) * sizeof ( char* ) );
        if ( tr == NULL ) {
            return retv;
        }
        retv                  = tr;
        retv[( *length )]     = strdup ( buffer );
        retv[( *length ) + 1] = NULL;

        // Filter out line-end.
        if ( retv[( *length )][strlen ( buffer ) - 1] == '\n' ) {
            retv[( *length )][strlen ( buffer ) - 1] = '\0';
        }

        ( *length )++;
    }

    return retv;
}

char **execute_executor ( ScriptOptions *options, const char *result, unsigned int *length )
{
    char **retv = NULL;
    char *command;
    if ( asprintf ( &command, "%s %s", options->script_path, result ) > 0 ) {
        retv = get_script_output ( command, length );
        free ( command );
    }
    return retv;
}

SwitcherMode script_switcher_dialog ( char **input, void *data )
{
    ScriptOptions *options = (ScriptOptions *) data;
    assert ( options != NULL );
    int           selected_line = 0;
    SwitcherMode  retv          = MODE_EXIT;
    unsigned int  length        = 0;
    char          **list        = get_script_output ( options->script_path, &length );


    do {
        unsigned int new_length = 0;
        char         **new_list = NULL;
        int          mretv      = menu ( list, length, input, options->name, NULL, NULL,
                                         token_match, NULL, &selected_line );

        if ( mretv == MENU_NEXT ) {
            retv = NEXT_DIALOG;
        }
        else if ( mretv == MENU_OK && list[selected_line] != NULL ) {
            new_list = execute_executor ( options, list[selected_line], &new_length );
        }
        else if ( mretv == MENU_CUSTOM_INPUT && *input != NULL && *input[0] != '\0' ) {
            new_list = execute_executor ( options, *input, &new_length );
        }

        // Free old list.
        for ( unsigned int i = 0; i < length; i++ ) {
            free ( list[i] );
        }

        if ( list != NULL ) {
            free ( list );
            list = NULL;
        }
        // If a new list was generated, use that an loop around.
        if ( new_list != NULL ) {
            list   = new_list;
            length = new_length;
            free ( *input );
            *input = NULL;
        }
    } while ( list != NULL );

    return retv;
}

void script_switcher_free_options ( ScriptOptions *sw )
{
    if ( sw == NULL ) {
        return;
    }
    free ( sw->name );
    free ( sw->script_path );
    free ( sw );
}


ScriptOptions *script_switcher_parse_setup ( const char *str )
{
    ScriptOptions *sw    = calloc ( 1, sizeof ( *sw ) );
    char          *endp  = NULL;
    char          *parse = strdup ( str );
    unsigned int  index  = 0;
    // TODO: This is naive and can be improved.
    for ( char *token = strtok_r ( parse, ":", &endp ); token != NULL; token = strtok_r ( NULL, ":", &endp ) ) {
        if ( index == 0 ) {
            sw->name = strdup ( token );
        }
        else if ( index == 1 ) {
            sw->script_path = strdup ( token );
        }
        index++;
    }
    free ( parse );
    if ( index == 2 ) {
        return sw;
    }
    fprintf ( stderr, "The script command '%s' has %d options, but needs 2: <name>:<script>.\n",
              str, index );
    script_switcher_free_options ( sw );
    return NULL;
}