#include <cassert>
#include <vector>
#include <iterator>
#include "../../source/utf8.h"
using namespace utf8;
using namespace std;

int main()
{
    //append
    unsigned char u[5] = {0,0,0,0,0};

    unsigned char* end = append(0x0448, u);
    assert (u[0] == 0xd1 && u[1] == 0x88 && u[2] == 0 && u[3] == 0 && u[4] == 0);

    end = append(0x65e5, u);
    assert (u[0] == 0xe6 && u[1] == 0x97 && u[2] == 0xa5 && u[3] == 0 && u[4] == 0);

    end = append(0x3044, u);
    assert (u[0] == 0xe3 && u[1] == 0x81 && u[2] == 0x84 && u[3] == 0 && u[4] == 0);

    end = append(0x10346, u);
    assert (u[0] == 0xf0 && u[1] == 0x90 && u[2] == 0x8d && u[3] == 0x86 && u[4] == 0);

    //next
    char* twochars = "\xe6\x97\xa5\xd1\x88";
    char* w = twochars;
    int cp = next(w, twochars + 6);
    assert (cp == 0x65e5);
    assert (w == twochars + 3);

    char* threechars = "\xf0\x90\x8d\x86\xe6\x97\xa5\xd1\x88";
    w = threechars;
    cp = next(w, threechars + 9);
    assert (cp == 0x10346);
    assert (w == threechars + 4);
    cp = next(w, threechars + 9);
    assert (cp == 0x65e5);
    assert (w == threechars + 7);
    cp = next(w, threechars + 9);
    assert (cp == 0x0448);
    assert (w == threechars + 9);


    //previous
    w = twochars + 3;
    cp = previous (w, twochars - 1);
    assert (cp == 0x65e5);
    assert (w == twochars);

    w = threechars + 9;
    cp = previous(w, threechars - 1);
    assert (cp == 0x0448);
    assert (w == threechars + 7);
    cp = previous(w, threechars -1);
    assert (cp == 0x65e5);
    assert (w == threechars + 4);
    cp = previous(w, threechars - 1);
    assert (cp == 0x10346);
    assert (w == threechars); 

    // advance
    w = twochars;
    advance (w, 2, twochars + 6);
    assert (w == twochars + 5);

    // distance
    size_t dist = utf8::distance(twochars, twochars + 5);
    assert (dist == 2);

    // utf32to8
    int utf32string[] = {0x448, 0x65E5, 0x10346, 0};
    vector<char> utf8result;
    utf32to8(utf32string, utf32string + 3, back_inserter(utf8result));
    assert (utf8result.size() == 9);
    // try it with the return value;
    char* utf8_end = utf32to8(utf32string, utf32string + 3, &utf8result[0]);
    assert (utf8_end == &utf8result[0] + 9);

    //utf8to32
    vector<int> utf32result;
    utf8to32(twochars, twochars + 5, back_inserter(utf32result));
    assert (utf32result.size() == 2);
    // try it with the return value;
    int* utf32_end = utf8to32(twochars, twochars + 5, &utf32result[0]);
    assert (utf32_end == &utf32result[0] + 2);

    //utf16to8
    unsigned short utf16string[] = {0x41, 0x0448, 0x65e5, 0xd834, 0xdd1e};
    utf8result.clear();
    utf16to8(utf16string, utf16string + 5, back_inserter(utf8result));
    assert (utf8result.size() == 10);
    // try it with the return value;
    utf8_end = utf16to8 (utf16string, utf16string + 5, &utf8result[0]);
    assert (utf8_end == &utf8result[0] + 10);

    //utf8to16
    char utf8_with_surrogates[] = "\xe6\x97\xa5\xd1\x88\xf0\x9d\x84\x9e";
    vector <unsigned short> utf16result;
    utf8to16(utf8_with_surrogates, utf8_with_surrogates + 9, back_inserter(utf16result));
    assert (utf16result.size() == 4);
    assert (utf16result[2] == 0xd834);
    assert (utf16result[3] == 0xdd1e);
    // try it with the return value;
    unsigned short* utf16_end = utf8to16 (utf8_with_surrogates, utf8_with_surrogates + 9, &utf16result[0]);
    assert (utf16_end == &utf16result[0] + 4);

    //find_invalid
    char utf_invalid[] = "\xe6\x97\xa5\xd1\x88\xfa";
    char* invalid = find_invalid(utf_invalid, utf_invalid + 6);
    assert (invalid == utf_invalid + 5);

    //is_valid
    bool bvalid = is_valid(utf_invalid, utf_invalid + 6);
    assert (bvalid == false);
    bvalid = is_valid(utf8_with_surrogates, utf8_with_surrogates + 9);
    assert (bvalid == true);

    //is_bom
    unsigned char byte_order_mark[] = {0xef, 0xbb, 0xbf};
    bool bbom = is_bom(byte_order_mark);
    assert (bbom == true);

    //////////////////////////////////////////////////////////
    //// Unchecked variants
    //////////////////////////////////////////////////////////

    //append
    memset(u, 0, 5);
    end = unchecked::append(0x0448, u);
    assert (u[0] == 0xd1 && u[1] == 0x88 && u[2] == 0 && u[3] == 0 && u[4] == 0);

    end = unchecked::append(0x65e5, u);
    assert (u[0] == 0xe6 && u[1] == 0x97 && u[2] == 0xa5 && u[3] == 0 && u[4] == 0);

    end = unchecked::append(0x10346, u);
    assert (u[0] == 0xf0 && u[1] == 0x90 && u[2] == 0x8d && u[3] == 0x86 && u[4] == 0);

    //next
    w = twochars;
    cp = unchecked::next(w);
    assert (cp == 0x65e5);
    assert (w == twochars + 3);

    w = threechars;
    cp = unchecked::next(w);
    assert (cp == 0x10346);
    assert (w == threechars + 4);
    cp = unchecked::next(w);
    assert (cp == 0x65e5);
    assert (w == threechars + 7);
    cp = unchecked::next(w);
    assert (cp == 0x0448);
    assert (w == threechars + 9);


    //previous
    w = twochars + 3;
    cp = unchecked::previous (w);
    assert (cp == 0x65e5);
    assert (w == twochars);

    w = threechars + 9;
    cp = unchecked::previous(w);
    assert (cp == 0x0448);
    assert (w == threechars + 7);
    cp = unchecked::previous(w);
    assert (cp == 0x65e5);
    assert (w == threechars + 4);
    cp = unchecked::previous(w);
    assert (cp == 0x10346);
    assert (w == threechars); 

    // advance
    w = twochars;
    unchecked::advance (w, 2);
    assert (w == twochars + 5);

    // distance
    dist = unchecked::distance(twochars, twochars + 5);
    assert (dist == 2);

    // utf32to8
    utf8result.clear();
    unchecked::utf32to8(utf32string, utf32string + 3, back_inserter(utf8result));
    assert (utf8result.size() == 9);
    // try it with the return value;
    utf8_end = utf32to8(utf32string, utf32string + 3, &utf8result[0]);
    assert(utf8_end == &utf8result[0] + 9);

    //utf8to32
    utf32result.clear();
    unchecked::utf8to32(twochars, twochars + 5, back_inserter(utf32result));
    assert (utf32result.size() == 2);
    // try it with the return value;
    utf32_end = utf8to32(twochars, twochars + 5, &utf32result[0]);
    assert (utf32_end == &utf32result[0] + 2);

    //utf16to8
    utf8result.clear();
    unchecked::utf16to8(utf16string, utf16string + 5, back_inserter(utf8result));
    assert (utf8result.size() == 10);
    // try it with the return value;
    utf8_end = utf16to8 (utf16string, utf16string + 5, &utf8result[0]);
    assert (utf8_end == &utf8result[0] + 10);

    //utf8to16
    utf16result.clear();
    unchecked::utf8to16(utf8_with_surrogates, utf8_with_surrogates + 9, back_inserter(utf16result));
    assert (utf16result.size() == 4);
    assert (utf16result[2] == 0xd834);
    assert (utf16result[3] == 0xdd1e);
    // try it with the return value;
    utf16_end = utf8to16 (utf8_with_surrogates, utf8_with_surrogates + 9, &utf16result[0]);
    assert (utf16_end == &utf16result[0] + 4);
}