/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2022 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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 2
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <errno.h>

#include <wx/intl.h>
#include <wx/string.h>

#include <string_utils.h>
#include <richio.h>

#include <config.h> // contains strncasecmp for msvc
#include "sch_legacy_plugin_helpers.h"


// Token delimiters.
const char* delims = " \t\r\n";


bool is_eol( char c )
{
    //        The default file eol character used internally by KiCad.
    //        |
    //        |            Possible eol if someone edited the file by hand on certain platforms.
    //        |            |
    //        |            |           May have gone past eol with strtok().
    //        |            |           |
    if( c == '\n' || c == '\r' || c == 0 )
        return true;

    return false;
}


bool strCompare( const char* aString, const char* aLine, const char** aOutput )
{
    size_t len = strlen( aString );
    bool retv = ( strncasecmp( aLine, aString, len ) == 0 ) &&
                ( isspace( aLine[ len ] ) || aLine[ len ] == 0 );

    if( retv && aOutput )
    {
        const char* tmp = aLine;

        // Move past the end of the token.
        tmp += len;

        // Move to the beginning of the next token.
        while( *tmp && isspace( *tmp ) )
            tmp++;

        *aOutput = tmp;
    }

    return retv;
}


int parseInt( LINE_READER& aReader, const char* aLine, const char** aOutput )
{
    if( !*aLine )
        SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aLine );

    // Clear errno before calling strtol() in case some other crt call set it.
    errno = 0;

    long retv = strtol( aLine, (char**) aOutput, 10 );

    // Make sure no error occurred when calling strtol().
    if( errno == ERANGE )
        SCH_PARSE_ERROR( "invalid integer value", aReader, aLine );

    // strtol does not strip off whitespace before the next token.
    if( aOutput )
    {
        const char* next = *aOutput;

        while( *next && isspace( *next ) )
            next++;

        *aOutput = next;
    }

    return (int) retv;
}


uint32_t parseHex( LINE_READER& aReader, const char* aLine, const char** aOutput )
{
    if( !*aLine )
        SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aLine );

    // Due to some issues between some files created by a 64 bits version and those
    // created by a 32 bits version, we use here a temporary at least 64 bits storage:
    unsigned long long retv;

    // Clear errno before calling strtoull() in case some other crt call set it.
    errno = 0;
    retv = strtoull( aLine, (char**) aOutput, 16 );

    // Make sure no error occurred when calling strtoull().
    if( errno == ERANGE )
        SCH_PARSE_ERROR( "invalid hexadecimal number", aReader, aLine );

    // Strip off whitespace before the next token.
    if( aOutput )
    {
        const char* next = *aOutput;

        while( *next && isspace( *next ) )
            next++;

        *aOutput = next;
    }

    return (uint32_t)retv;
}


double parseDouble( LINE_READER& aReader, const char* aLine, const char** aOutput )
{
    if( !*aLine )
        SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aLine );

    // Clear errno before calling strtod() in case some other crt call set it.
    errno = 0;

    double retv = strtod( aLine, (char**) aOutput );

    // Make sure no error occurred when calling strtod().
    if( errno == ERANGE )
        SCH_PARSE_ERROR( "invalid floating point number", aReader, aLine );

    // strtod does not strip off whitespace before the next token.
    if( aOutput )
    {
        const char* next = *aOutput;

        while( *next && isspace( *next ) )
            next++;

        *aOutput = next;
    }

    return retv;
}


char parseChar( LINE_READER& aReader, const char* aCurrentToken, const char** aNextToken )
{
    while( *aCurrentToken && isspace( *aCurrentToken ) )
        aCurrentToken++;

    if( !*aCurrentToken )
        SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aCurrentToken );

    if( !isspace( *( aCurrentToken + 1 ) ) )
        SCH_PARSE_ERROR( "expected single character token", aReader, aCurrentToken );

    if( aNextToken )
    {
        const char* next = aCurrentToken + 2;

        while( *next && isspace( *next ) )
            next++;

        *aNextToken = next;
    }

    return *aCurrentToken;
}


void parseUnquotedString( wxString& aString, LINE_READER& aReader, const char* aCurrentToken,
                          const char** aNextToken, bool aCanBeEmpty )
{
    if( !*aCurrentToken )
    {
        if( aCanBeEmpty )
            return;
        else
            SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aCurrentToken );
    }

    const char* tmp = aCurrentToken;

    while( *tmp && isspace( *tmp ) )
        tmp++;

    if( !*tmp )
    {
        if( aCanBeEmpty )
            return;
        else
            SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aCurrentToken );
    }

    std::string utf8;

    while( *tmp && !isspace( *tmp ) )
        utf8 += *tmp++;

    aString = From_UTF8( utf8.c_str() );

    if( aString.IsEmpty() && !aCanBeEmpty )
        SCH_PARSE_ERROR( _( "expected unquoted string" ), aReader, aCurrentToken );

    if( aNextToken )
    {
        const char* next = tmp;

        while( *next && isspace( *next ) )
            next++;

        *aNextToken = next;
    }
}


void parseQuotedString( wxString& aString, LINE_READER& aReader, const char* aCurrentToken,
                        const char** aNextToken, bool aCanBeEmpty )
{
    if( !*aCurrentToken )
    {
        if( aCanBeEmpty )
            return;
        else
            SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aCurrentToken );
    }

    const char* tmp = aCurrentToken;

    while( *tmp && isspace( *tmp ) )
        tmp++;

    if( !*tmp )
    {
        if( aCanBeEmpty )
            return;
        else
            SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aCurrentToken );
    }

    // Verify opening quote.
    if( *tmp != '"' )
        SCH_PARSE_ERROR( "expecting opening quote", aReader, aCurrentToken );

    tmp++;

    std::string utf8;     // utf8 without escapes and quotes.

    // Fetch everything up to closing quote.
    while( *tmp )
    {
        if( *tmp == '\\' )
        {
            tmp++;

            if( !*tmp )
                SCH_PARSE_ERROR( _( "unexpected end of line" ), aReader, aCurrentToken );

            // Do not copy the escape byte if it is followed by \ or "
            if( *tmp != '"' && *tmp != '\\' )
                utf8 += '\\';

            utf8 += *tmp;
        }
        else if( *tmp == '"' )  // Closing double quote.
        {
            break;
        }
        else
        {
            utf8 += *tmp;
        }

        tmp++;
    }

    aString = From_UTF8( utf8.c_str() );

    if( aString.IsEmpty() && !aCanBeEmpty )
        SCH_PARSE_ERROR( "expected quoted string", aReader, aCurrentToken );

    if( *tmp && *tmp != '"' )
        SCH_PARSE_ERROR( "no closing quote for string found", aReader, tmp );

    // Move past the closing quote.
    tmp++;

    if( aNextToken )
    {
        const char* next = tmp;

        while( *next == ' ' )
            next++;

        *aNextToken = next;
    }
}