/*
 * Copyright (C) 2000-2008  Lorenzo Bettini <http://www.lorenzobettini.it>
 *
 * This program 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.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <iostream>
#include <fstream>
#include <cstdlib>

#include "fileutil.h"
#include "verbosity.h"
#include "ioexception.h"

#ifndef CHROOT_INPUT_DIR
#define CHROOT_INPUT_DIR ""
#endif

using namespace std;

namespace srchilite {

static bool verbose = false;

void set_file_util_verbose(bool b) {
    verbose = b;
}

// global for the path to start to look for if no
// path was specified
// FIXME avoid using a global variable
std::string start_path;

string readFile(const string &fileName) throw (IOException) {
    ifstream file(fileName.c_str());

    if (!file.is_open()) {
        throw IOException("cannot open", fileName);
    }

    string s, line;
    while (getline(file, line)) {
        s += line + "\n";
    }

    return s;
}

/*
 char * read_file(const string &fileName) {
 char *buffer = 0;
 long int char_count;

 // we open it as binary otherwise we may experience problems under
 // Windows system: when we fread, the number of char read can be
 // less then char_count, and thus we'd get an error...
 ifstream file(fileName.c_str(), ios_base::binary);
 if (!file.is_open() )
 file_error("Error operning", fileName);
 else {
 // let's go to the end of the file...
 file.seekg(0, ios::end);
 if (!file)
 file_error("Error positioning", fileName);

 // ...to read the dimension
 char_count = file.tellg();
 if (!file)
 file_error("Error reading position", fileName);

 buffer = new char [char_count + 1];
 if (!buffer)
 internal_error("Memory allocation failed");

 file.seekg(0, ios::beg);
 if (!file)
 file_error("Error positioning to start", fileName);

 //copy file into memory
 file.read(buffer, char_count);
 buffer[char_count] = '\0';

 file.close();
 }

 return buffer;
 }
 */

string createOutputFileName(const string &inputFileName,
        const string &outputDir, const string &ext) {
    string input_file_name;
    char path_separator = '/';

    if (!outputDir.size())
        input_file_name = inputFileName;
    else {
        string::size_type pos_of_sep;
        pos_of_sep = inputFileName.find_last_of('/');

        if (pos_of_sep == string::npos) // try with DOS separator
        {
            pos_of_sep = inputFileName.find_last_of('\\');
            if (pos_of_sep != string::npos)
                path_separator = '\\';
        }

        if (pos_of_sep != string::npos)
            input_file_name = inputFileName.substr(pos_of_sep + 1);
        else
            input_file_name = inputFileName;
    }

    string outputFileName;

    if (outputDir.size()) {
        outputFileName += outputDir;
        outputFileName += path_separator;
    }
    outputFileName += input_file_name;
    outputFileName += (ext.size() ? "." + ext : "");

    return outputFileName;
}

unsigned int get_line_count(istream &input) {
    unsigned int count = 0;
    string line;

    while (true) {
        getline(input, line);
        if (!input.eof())
            ++count;
        else
            break;
    }

    return count;
}

string get_file_extension(const string &s) {
    string::size_type pos_of_sep;

    pos_of_sep = s.rfind(".");

    if (pos_of_sep == string::npos)
        return ""; // no extension

    return s.substr(pos_of_sep + 1);
}

FILE *open_file_stream(const string &input_file_name) {
    FILE *in = fopen(input_file_name.c_str(), "r");
    return in;
}

istream *open_file_istream(const string &input_file_name) {
    ifstream *in = new ifstream(input_file_name.c_str());
    if (!in || !(*in)) {
        if (!in)
            throw IOException("no more free memory", "");
        else
            delete in;
        return 0;
    }

    return in;
}

istream *open_file_istream_or_error(const string &input_file_name) {
    istream *in = open_file_istream(input_file_name);

    if (!in)
        throw IOException("cannot open", input_file_name);

    return in;
}

istream *_open_data_file_istream(const string &path,
        const string &input_file_name) {
    const string file = (path.size() ? path + "/" : "") + input_file_name;
    VERBOSELN("opening " + file);
    return open_file_istream(file);
}

istream *open_data_file_istream(const string &path,
        const string &input_file_name, const string &start) {
    if (!input_file_name.size())
        throw IOException("empty file name", input_file_name);

    istream *in = 0;
    if (contains_path(input_file_name)) {
        in = _open_data_file_istream("", input_file_name);
    } else if (path.size()) {
        in = _open_data_file_istream(path, input_file_name);
    } else {
        in = _open_data_file_istream(".", input_file_name);
    }

    if (!in)  // falback if all else failed, start defaults to start_path
        in = _open_data_file_istream(start, input_file_name);

    if (!in)
        throw IOException("cannot find input file anywhere", input_file_name);

    return in;
}

// FIXME: duplicate for istream and FILE *, make it uniform!
FILE *_open_data_file_stream(const string &path, const string &input_file_name) {
    const string file = (path.size() ? path + "/" : "") + input_file_name;
    VERBOSELN("opening " + file);
    return open_file_stream(file);
}

FILE *open_data_file_stream(const string &path, const string &input_file_name,
        const string &start) {
    if (!input_file_name.size())
        throw IOException("empty file name", input_file_name);

    FILE *in = 0;
    if (contains_path(input_file_name)) {
        in = _open_data_file_stream("", input_file_name);
    } else if (path.size()) {
        in = _open_data_file_stream(path, input_file_name);
    } else {
        in = _open_data_file_stream(".", input_file_name);
    }

    if (!in)  // falback if all else failed, start defaults to start_path
        in = _open_data_file_stream(start, input_file_name);

    if (!in)
        throw IOException("cannot find input file anywhere", input_file_name);

    return in;
}

bool read_line(istream *in, string &line) {
    if (in->eof())
        return false;

    getline(*in, line);
    return true;
}

string get_file_path(const string &s) {
    string::size_type pos_of_sep;

    pos_of_sep = s.rfind("/");
    if (pos_of_sep == string::npos)
        pos_of_sep = s.rfind("\\"); // try also with DOS path sep

    if (pos_of_sep == string::npos)
        return ""; // no path

    return s.substr(0, pos_of_sep + 1);
}

bool contains_path(const string &s) {
    return (get_file_path(s).size() > 0);
}

string strip_file_path(const string &s) {
    string::size_type pos_of_sep;

    pos_of_sep = s.rfind("/");
    if (pos_of_sep == string::npos)
        pos_of_sep = s.rfind("\\"); // try also with DOS path sep

    if (pos_of_sep == string::npos)
        return s; // no path

    return s.substr(pos_of_sep + 1);
}

string get_input_file_name(const string &file_name) {
    if (!file_name.size())
        return "";

    return CHROOT_INPUT_DIR + file_name;
}

}
