/** \file builtin_complete.c Functions defining the complete builtin

Functions used for implementing the complete builtin.

*/
#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <sys/types.h>
#include <termios.h>
#include <signal.h>

#include "fallback.h"
#include "util.h"

#include "wutil.h"
#include "builtin.h"
#include "common.h"
#include "complete.h"
#include "wgetopt.h"
#include "parser.h"
#include "reader.h"


/**
   Internal storage for the builtin_complete_get_temporary_buffer() function.
*/
static const wchar_t *temporary_buffer;

/*
  builtin_complete_* are a set of rather silly looping functions that
  make sure that all the proper combinations of complete_add or
  complete_remove get called. This is needed since complete allows you
  to specify multiple switches on a single commandline, like 'complete
  -s a -s b -s c', but the complete_add function only accepts one
  short switch and one long switch.
*/

/**
   Silly function
*/
static void  builtin_complete_add2(const wchar_t *cmd,
                                   int cmd_type,
                                   const wchar_t *short_opt,
                                   const wcstring_list_t &gnu_opt,
                                   const wcstring_list_t &old_opt,
                                   int result_mode,
                                   const wchar_t *condition,
                                   const wchar_t *comp,
                                   const wchar_t *desc,
                                   int flags)
{
    size_t i;
    const wchar_t *s;

    for (s=short_opt; *s; s++)
    {
        complete_add(cmd,
                     cmd_type,
                     *s,
                     0,
                     0,
                     result_mode,
                     condition,
                     comp,
                     desc,
                     flags);
    }

    for (i=0; i<gnu_opt.size(); i++)
    {
        complete_add(cmd,
                     cmd_type,
                     0,
                     gnu_opt.at(i).c_str(),
                     0,
                     result_mode,
                     condition,
                     comp,
                     desc,
                     flags);
    }

    for (i=0; i<old_opt.size(); i++)
    {
        complete_add(cmd,
                     cmd_type,
                     0,
                     old_opt.at(i).c_str(),
                     1,
                     result_mode,
                     condition,
                     comp,
                     desc,
                     flags);
    }

    if (old_opt.empty() && gnu_opt.empty() && wcslen(short_opt) == 0)
    {
        complete_add(cmd,
                     cmd_type,
                     0,
                     0,
                     0,
                     result_mode,
                     condition,
                     comp,
                     desc,
                     flags);
    }
}

/**
   Silly function
*/
static void  builtin_complete_add(const wcstring_list_t &cmd,
                                  const wcstring_list_t &path,
                                  const wchar_t *short_opt,
                                  wcstring_list_t &gnu_opt,
                                  wcstring_list_t &old_opt,
                                  int result_mode,
                                  int authoritative,
                                  const wchar_t *condition,
                                  const wchar_t *comp,
                                  const wchar_t *desc,
                                  int flags)
{
    for (size_t i=0; i<cmd.size(); i++)
    {
        builtin_complete_add2(cmd.at(i).c_str(),
                              COMMAND,
                              short_opt,
                              gnu_opt,
                              old_opt,
                              result_mode,
                              condition,
                              comp,
                              desc,
                              flags);

        if (authoritative != -1)
        {
            complete_set_authoritative(cmd.at(i).c_str(),
                                       COMMAND,
                                       authoritative);
        }

    }

    for (size_t i=0; i<path.size(); i++)
    {
        builtin_complete_add2(path.at(i).c_str(),
                              PATH,
                              short_opt,
                              gnu_opt,
                              old_opt,
                              result_mode,
                              condition,
                              comp,
                              desc,
                              flags);

        if (authoritative != -1)
        {
            complete_set_authoritative(path.at(i).c_str(),
                                       PATH,
                                       authoritative);
        }

    }
}

/**
   Silly function
*/
static void builtin_complete_remove3(const wchar_t *cmd,
                                     int cmd_type,
                                     wchar_t short_opt,
                                     const wcstring_list_t &long_opt)
{
    for (size_t i=0; i<long_opt.size(); i++)
    {
        complete_remove(cmd,
                        cmd_type,
                        short_opt,
                        long_opt.at(i).c_str());
    }
}

/**
   Silly function
*/
static void  builtin_complete_remove2(const wchar_t *cmd,
                                      int cmd_type,
                                      const wchar_t *short_opt,
                                      const wcstring_list_t &gnu_opt,
                                      const wcstring_list_t &old_opt)
{
    const wchar_t *s = (wchar_t *)short_opt;
    if (*s)
    {
        for (; *s; s++)
        {
            if (old_opt.empty() && gnu_opt.empty())
            {
                complete_remove(cmd,
                                cmd_type,
                                *s,
                                0);

            }
            else
            {
                builtin_complete_remove3(cmd,
                                         cmd_type,
                                         *s,
                                         gnu_opt);
                builtin_complete_remove3(cmd,
                                         cmd_type,
                                         *s,
                                         old_opt);
            }
        }
    }
    else
    {
        builtin_complete_remove3(cmd,
                                 cmd_type,
                                 0,
                                 gnu_opt);
        builtin_complete_remove3(cmd,
                                 cmd_type,
                                 0,
                                 old_opt);

    }


}

/**
   Silly function
*/
static void  builtin_complete_remove(const wcstring_list_t &cmd,
                                     const wcstring_list_t &path,
                                     const wchar_t *short_opt,
                                     const wcstring_list_t &gnu_opt,
                                     const wcstring_list_t &old_opt)
{
    for (size_t i=0; i<cmd.size(); i++)
    {
        builtin_complete_remove2(cmd.at(i).c_str(),
                                 COMMAND,
                                 short_opt,
                                 gnu_opt,
                                 old_opt);
    }

    for (size_t i=0; i<path.size(); i++)
    {
        builtin_complete_remove2(path.at(i).c_str(),
                                 PATH,
                                 short_opt,
                                 gnu_opt,
                                 old_opt);
    }

}


const wchar_t *builtin_complete_get_temporary_buffer()
{
    ASSERT_IS_MAIN_THREAD();
    return temporary_buffer;
}

/**
   The complete builtin. Used for specifying programmable
   tab-completions. Calls the functions in complete.c for any heavy
   lifting. Defined in builtin_complete.c
*/
static int builtin_complete(parser_t &parser, wchar_t **argv)
{
    ASSERT_IS_MAIN_THREAD();
    bool res=false;
    int argc=0;
    int result_mode=SHARED;
    int remove = 0;
    int authoritative = -1;
    int flags = COMPLETE_AUTO_SPACE;

    wcstring short_opt;
    wcstring_list_t gnu_opt, old_opt;
    const wchar_t *comp=L"", *desc=L"", *condition=L"";

    bool do_complete = false;
    wcstring do_complete_param;

    wcstring_list_t cmd;
    wcstring_list_t path;

    static int recursion_level=0;

    argc = builtin_count_args(argv);

    woptind=0;

    while (! res)
    {
        static const struct woption
                long_options[] =
        {
            {
                L"exclusive", no_argument, 0, 'x'
            }
            ,
            {
                L"no-files", no_argument, 0, 'f'
            }
            ,
            {
                L"require-parameter", no_argument, 0, 'r'
            }
            ,
            {
                L"path", required_argument, 0, 'p'
            }
            ,
            {
                L"command", required_argument, 0, 'c'
            }
            ,
            {
                L"short-option", required_argument, 0, 's'
            }
            ,
            {
                L"long-option", required_argument, 0, 'l'
            }
            ,
            {
                L"old-option", required_argument, 0, 'o'
            }
            ,
            {
                L"description", required_argument, 0, 'd'
            }
            ,
            {
                L"arguments", required_argument, 0, 'a'
            }
            ,
            {
                L"erase", no_argument, 0, 'e'
            }
            ,
            {
                L"unauthoritative", no_argument, 0, 'u'
            }
            ,
            {
                L"authoritative", no_argument, 0, 'A'
            }
            ,
            {
                L"condition", required_argument, 0, 'n'
            }
            ,
            {
                L"do-complete", optional_argument, 0, 'C'
            }
            ,
            {
                L"help", no_argument, 0, 'h'
            }
            ,
            {
                0, 0, 0, 0
            }
        }
        ;

        int opt_index = 0;

        int opt = wgetopt_long(argc,
                               argv,
                               L"a:c:p:s:l:o:d:frxeuAn:C::h",
                               long_options,
                               &opt_index);
        if (opt == -1)
            break;

        switch (opt)
        {
            case 0:
                if (long_options[opt_index].flag != 0)
                    break;
                append_format(stderr_buffer,
                              BUILTIN_ERR_UNKNOWN,
                              argv[0],
                              long_options[opt_index].name);
                builtin_print_help(parser, argv[0], stderr_buffer);


                res = true;
                break;

            case 'x':
                result_mode |= EXCLUSIVE;
                break;

            case 'f':
                result_mode |= NO_FILES;
                break;

            case 'r':
                result_mode |= NO_COMMON;
                break;

            case 'p':
            case 'c':
            {
                wcstring tmp = woptarg;
                if (unescape_string(tmp, 1))
                {
                    if (opt=='p')
                        path.push_back(tmp);
                    else
                        cmd.push_back(tmp);
                }
                else
                {
                    append_format(stderr_buffer, L"%ls: Invalid token '%ls'\n", argv[0], woptarg);
                    res = true;
                }
                break;
            }

            case 'd':
                desc = woptarg;
                break;

            case 'u':
                authoritative=0;
                break;

            case 'A':
                authoritative=1;
                break;

            case 's':
                short_opt.append(woptarg);
                break;

            case 'l':
                gnu_opt.push_back(woptarg);
                break;

            case 'o':
                old_opt.push_back(woptarg);
                break;

            case 'a':
                comp = woptarg;
                break;

            case 'e':
                remove = 1;
                break;

            case 'n':
                condition = woptarg;
                break;

            case 'C':
                do_complete = true;
                do_complete_param = woptarg ? woptarg : reader_get_buffer();
                break;

            case 'h':
                builtin_print_help(parser, argv[0], stdout_buffer);
                return 0;

            case '?':
                builtin_unknown_option(parser, argv[0], argv[woptind-1]);
                res = true;
                break;

        }

    }

    if (!res)
    {
        if (condition && wcslen(condition))
        {
            if (parser.test(condition))
            {
                append_format(stderr_buffer,
                              L"%ls: Condition '%ls' contained a syntax error\n",
                              argv[0],
                              condition);

                parser.test(condition, NULL, &stderr_buffer, argv[0]);

                res = true;
            }
        }
    }

    if (!res)
    {
        if (comp && wcslen(comp))
        {
            if (parser.test_args(comp, 0, 0))
            {
                append_format(stderr_buffer,
                              L"%ls: Completion '%ls' contained a syntax error\n",
                              argv[0],
                              comp);

                parser.test_args(comp, &stderr_buffer, argv[0]);

                res = true;
            }
        }
    }

    if (!res)
    {
        if (do_complete)
        {
            const wchar_t *token;

            parse_util_token_extent(do_complete_param.c_str(), do_complete_param.size(), &token, 0, 0, 0);

            const wchar_t *prev_temporary_buffer = temporary_buffer;
            temporary_buffer = do_complete_param.c_str();

            if (recursion_level < 1)
            {
                recursion_level++;

                std::vector<completion_t> comp;
                complete(do_complete_param, comp, COMPLETION_REQUEST_DEFAULT);

                for (size_t i=0; i< comp.size() ; i++)
                {
                    const completion_t &next =  comp.at(i);

                    const wchar_t *prepend;

                    if (next.flags & COMPLETE_REPLACES_TOKEN)
                    {
                        prepend = L"";
                    }
                    else
                    {
                        prepend = token;
                    }


                    if (!(next.description).empty())
                    {
                        append_format(stdout_buffer, L"%ls%ls\t%ls\n", prepend, next.completion.c_str(), next.description.c_str());
                    }
                    else
                    {
                        append_format(stdout_buffer, L"%ls%ls\n", prepend, next.completion.c_str());
                    }
                }

                recursion_level--;
            }

            temporary_buffer = prev_temporary_buffer;

        }
        else if (woptind != argc)
        {
            append_format(stderr_buffer,
                          _(L"%ls: Too many arguments\n"),
                          argv[0]);
            builtin_print_help(parser, argv[0], stderr_buffer);

            res = true;
        }
        else if (cmd.empty() && path.empty())
        {
            /* No arguments specified, meaning we print the definitions of
             * all specified completions to stdout.*/
            complete_print(stdout_buffer);
        }
        else
        {
            if (remove)
            {
                builtin_complete_remove(cmd,
                                        path,
                                        short_opt.c_str(),
                                        gnu_opt,
                                        old_opt);
            }
            else
            {
                builtin_complete_add(cmd,
                                     path,
                                     short_opt.c_str(),
                                     gnu_opt,
                                     old_opt,
                                     result_mode,
                                     authoritative,
                                     condition,
                                     comp,
                                     desc,
                                     flags);
            }

        }
    }

    return res ? 1 : 0;
}
