/**
 @file stringutils.cpp

 @maintainer Morgan McGuire, matrix@graphics3d.com

 @created 2000-09-09
 @edited  2008-01-10
*/

#include "G3D/platform.h"
#include "G3D/stringutils.h"
#include "G3D/BinaryInput.h"
#include <algorithm>

namespace G3D {

#ifdef _MSC_VER
    // disable: "C++ exception handler used"
#   pragma warning (push)
#   pragma warning (disable : 4530)
#endif
#ifdef G3D_WIN32
    const char* NEWLINE = "\r\n";
#else
    const char* NEWLINE = "\n";
    static bool iswspace(int ch) { return (ch==' ' || ch=='\t' || ch=='\n'); }
#endif

bool beginsWith(
    const std::string& test,
    const std::string& pattern) {

    if (test.size() >= pattern.size()) {
        for (int i = 0; i < (int)pattern.size(); ++i) {
            if (pattern[i] != test[i]) {
                return false;
            }
        }
        return true;
    } else {
        return false;
    }
}


bool endsWith(
    const std::string& test,
    const std::string& pattern) {

    if (test.size() >= pattern.size()) {
        int te = test.size() - 1;
        int pe = pattern.size() - 1;
        for (int i = pattern.size() - 1; i >= 0; --i) {
            if (pattern[pe - i] != test[te - i]) {
                return false;
            }
        }
        return true;
    } else {
        return false;
    }
}


std::string wordWrap(
    const std::string&      input,
    int                     numCols) {

    std::string output;
    size_t      c = 0;
    int         len;

    // Don't make lines less than this length
    int         minLength = numCols / 4;
    size_t      inLen = input.size();

    bool first = true;
    while (c < inLen) {
        if (first) {
            first = false;
        } else {
            output += NEWLINE;
        }

        if ((int)inLen - (int)c - 1 < numCols) {
            // The end
            output += input.substr(c, inLen - c);
            break;
        }

        len = numCols;

        // Look at character c + numCols, see if it is a space.
        while ((len > minLength) &&
               (input[c + len] != ' ')) {
            len--;
        }

        if (len == minLength) {
            // Just crop
            len = numCols;

        }

        output += input.substr(c, len);
        c += len;
        if (c < input.size()) {
            // Collapse multiple spaces.
            while ((input[c] == ' ') && (c < input.size())) {
                c++;
            }
        }
    }

    return output;
}


int stringCompare(
    const std::string&      s1,
    const std::string&      s2) {

    return stringPtrCompare(&s1, &s2);
}


int stringPtrCompare(
    const std::string*      s1,
    const std::string*      s2) {

    return s1->compare(*s2);
}


std::string toUpper(const std::string& x) {
    std::string result = x;
    std::transform(result.begin(), result.end(), result.begin(), toupper);
    return result;
}


std::string toLower(const std::string& x) {
    std::string result = x;
    std::transform(result.begin(), result.end(), result.begin(), tolower);
    return result;
}


Array<std::string> stringSplit(
    const std::string&          x,
    char                        splitChar) {

    Array<std::string> out;
    
    // Pointers to the beginning and end of the substring
    const char* start = x.c_str();
    const char* stop = start;
    
    while ((stop = strchr(start, splitChar))) {
        out.append(std::string(start, stop - start));
        start = stop + 1;
    }

    // Append the last one
    out.append(std::string(start));
    
    return out;
}


std::string stringJoin(
    const Array<std::string>&   a,
    char                        joinChar) {

    std::string out;

    for (int i = 0; i < (int)a.size() - 1; ++i) {
        out += a[i] + joinChar;
    }

    if (a.size() > 0) {
        return out + a.last();
    } else {
        return out;
    }
}


std::string stringJoin(
    const Array<std::string>&   a,
    const std::string&          joinStr) {

    std::string out;

    for (int i = 0; i < (int)a.size() - 1; ++i) {
        out += a[i] + joinStr;
    }

    if (a.size() > 0) {
        return out + a.last();
    } else {
        return out;
    }
}


std::string trimWhitespace(
    const std::string&              s) {

    size_t left = 0;
    
    // Trim from left
    while ((left < s.length()) && iswspace(s[left])) {
        ++left;
    }

    int right = s.length() - 1;
    // Trim from right
    while ((right > (int)left) && iswspace(s[right])) {
        --right;
    }
    
    return s.substr(left, right - left + 1);
}

}; // namespace

#undef NEWLINE
#ifdef _MSC_VER
#   pragma warning (pop)
#endif