#pragma once

#include "common.h"

typedef std::stringstream StrStream;

class Str : public std::string {
    mutable std::vector<uint16_t>* _u8_index = nullptr;

    void utf8_lazy_init() const{
        if(_u8_index != nullptr) return;
        _u8_index = new std::vector<uint16_t>();
        _u8_index->reserve(size());
        if(size() > 65535) throw std::runtime_error("str has more than 65535 bytes.");
        for(uint16_t i = 0; i < size(); i++){
            // https://stackoverflow.com/questions/3911536/utf-8-unicode-whats-with-0xc0-and-0x80
            if((at(i) & 0xC0) != 0x80) _u8_index->push_back(i);
        }
    }
public:
    Str() : std::string() {}
    Str(const char* s) : std::string(s) {}
    Str(const char* s, size_t n) : std::string(s, n) {}
    Str(const std::string& s) : std::string(s) {}
    Str(const Str& s) : std::string(s) {
        if(s._u8_index != nullptr){
            _u8_index = new std::vector<uint16_t>(*s._u8_index);
        }
    }
    Str(Str&& s) : std::string(std::move(s)) {
        delete _u8_index;
        _u8_index = s._u8_index;
        s._u8_index = nullptr;
    }

    i64 _to_u8_index(i64 index) const{
        utf8_lazy_init();
        auto p = std::lower_bound(_u8_index->begin(), _u8_index->end(), index);
        if(p != _u8_index->end() && *p != index) UNREACHABLE();
        return p - _u8_index->begin();
    }

    int u8_length() const {
        utf8_lazy_init();
        return _u8_index->size();
    }

    Str u8_getitem(int i) const{
        return u8_substr(i, i+1);
    }

    Str u8_substr(int start, int end) const{
        utf8_lazy_init();
        if(start >= end) return Str();
        int c_end = end >= _u8_index->size() ? size() : _u8_index->at(end);
        return substr(_u8_index->at(start), c_end - _u8_index->at(start));
    }

    Str lstrip() const {
        Str copy(*this);
        copy.erase(copy.begin(), std::find_if(copy.begin(), copy.end(), [](char c) {
            // std::isspace(c) does not working on windows (Debug)
            return c != ' ' && c != '\t' && c != '\r' && c != '\n';
        }));
        return Str(copy);
    }

    size_t hash() const {
        return std::hash<std::string>()(*this);
    }

    Str escape(bool single_quote) const {
        StrStream ss;
        ss << (single_quote ? '\'' : '"');
        for (int i=0; i<length(); i++) {
            char c = this->operator[](i);
            switch (c) {
                case '"':
                    if(!single_quote) ss << '\\';
                    ss << '"';
                    break;
                case '\'':
                    if(single_quote) ss << '\\';
                    ss << '\'';
                    break;
                case '\\': ss << '\\' << '\\'; break;
                case '\n': ss << "\\n"; break;
                case '\r': ss << "\\r"; break;
                case '\t': ss << "\\t"; break;
                default:
                    if ('\x00' <= c && c <= '\x1f') {
                        ss << "\\u"
                        << std::hex << std::setw(4) << std::setfill('0') << static_cast<int>(c);
                    } else {
                        ss << c;
                    }
            }
        }
        ss << (single_quote ? '\'' : '"');
        return ss.str();
    }

    Str& operator=(const Str& s){
        this->std::string::operator=(s);
        delete _u8_index;
        if(s._u8_index != nullptr){
            _u8_index = new std::vector<uint16_t>(*s._u8_index);
        }
        return *this;
    }

    Str& operator=(Str&& s){
        this->std::string::operator=(std::move(s));
        delete _u8_index;
        this->_u8_index = s._u8_index;
        s._u8_index = nullptr;
        return *this;
    }

    ~Str(){ delete _u8_index;}
};

const uint32_t kLoRangeA[] = {170,186,443,448,660,1488,1519,1568,1601,1646,1649,1749,1774,1786,1791,1808,1810,1869,1969,1994,2048,2112,2144,2208,2230,2308,2365,2384,2392,2418,2437,2447,2451,2474,2482,2486,2493,2510,2524,2527,2544,2556,2565,2575,2579,2602,2610,2613,2616,2649,2654,2674,2693,2703,2707,2730,2738,2741,2749,2768,2784,2809,2821,2831,2835,2858,2866,2869,2877,2908,2911,2929,2947,2949,2958,2962,2969,2972,2974,2979,2984,2990,3024,3077,3086,3090,3114,3133,3160,3168,3200,3205,3214,3218,3242,3253,3261,3294,3296,3313,3333,3342,3346,3389,3406,3412,3423,3450,3461,3482,3507,3517,3520,3585,3634,3648,3713,3716,3718,3724,3749,3751,3762,3773,3776,3804,3840,3904,3913,3976,4096,4159,4176,4186,4193,4197,4206,4213,4238,4352,4682,4688,4696,4698,4704,4746,4752,4786,4792,4800,4802,4808,4824,4882,4888,4992,5121,5743,5761,5792,5873,5888,5902,5920,5952,5984,5998,6016,6108,6176,6212,6272,6279,6314,6320,6400,6480,6512,6528,6576,6656,6688,6917,6981,7043,7086,7098,7168,7245,7258,7401,7406,7413,7418,8501,11568,11648,11680,11688,11696,11704,11712,11720,11728,11736,12294,12348,12353,12447,12449,12543,12549,12593,12704,12784,13312,19968,40960,40982,42192,42240,42512,42538,42606,42656,42895,42999,43003,43011,43015,43020,43072,43138,43250,43259,43261,43274,43312,43360,43396,43488,43495,43514,43520,43584,43588,43616,43633,43642,43646,43697,43701,43705,43712,43714,43739,43744,43762,43777,43785,43793,43808,43816,43968,44032,55216,55243,63744,64112,64285,64287,64298,64312,64318,64320,64323,64326,64467,64848,64914,65008,65136,65142,65382,65393,65440,65474,65482,65490,65498,65536,65549,65576,65596,65599,65616,65664,66176,66208,66304,66349,66370,66384,66432,66464,66504,66640,66816,66864,67072,67392,67424,67584,67592,67594,67639,67644,67647,67680,67712,67808,67828,67840,67872,67968,68030,68096,68112,68117,68121,68192,68224,68288,68297,68352,68416,68448,68480,68608,68864,69376,69415,69424,69600,69635,69763,69840,69891,69956,69968,70006,70019,70081,70106,70108,70144,70163,70272,70280,70282,70287,70303,70320,70405,70415,70419,70442,70450,70453,70461,70480,70493,70656,70727,70751,70784,70852,70855,71040,71128,71168,71236,71296,71352,71424,71680,71935,72096,72106,72161,72163,72192,72203,72250,72272,72284,72349,72384,72704,72714,72768,72818,72960,72968,72971,73030,73056,73063,73066,73112,73440,73728,74880,77824,82944,92160,92736,92880,92928,93027,93053,93952,94032,94208,100352,110592,110928,110948,110960,113664,113776,113792,113808,123136,123214,123584,124928,126464,126469,126497,126500,126503,126505,126516,126521,126523,126530,126535,126537,126539,126541,126545,126548,126551,126553,126555,126557,126559,126561,126564,126567,126572,126580,126585,126590,126592,126603,126625,126629,126635,131072,173824,177984,178208,183984,194560};
const uint32_t kLoRangeB[] = {170,186,443,451,660,1514,1522,1599,1610,1647,1747,1749,1775,1788,1791,1808,1839,1957,1969,2026,2069,2136,2154,2228,2237,2361,2365,2384,2401,2432,2444,2448,2472,2480,2482,2489,2493,2510,2525,2529,2545,2556,2570,2576,2600,2608,2611,2614,2617,2652,2654,2676,2701,2705,2728,2736,2739,2745,2749,2768,2785,2809,2828,2832,2856,2864,2867,2873,2877,2909,2913,2929,2947,2954,2960,2965,2970,2972,2975,2980,2986,3001,3024,3084,3088,3112,3129,3133,3162,3169,3200,3212,3216,3240,3251,3257,3261,3294,3297,3314,3340,3344,3386,3389,3406,3414,3425,3455,3478,3505,3515,3517,3526,3632,3635,3653,3714,3716,3722,3747,3749,3760,3763,3773,3780,3807,3840,3911,3948,3980,4138,4159,4181,4189,4193,4198,4208,4225,4238,4680,4685,4694,4696,4701,4744,4749,4784,4789,4798,4800,4805,4822,4880,4885,4954,5007,5740,5759,5786,5866,5880,5900,5905,5937,5969,5996,6000,6067,6108,6210,6264,6276,6312,6314,6389,6430,6509,6516,6571,6601,6678,6740,6963,6987,7072,7087,7141,7203,7247,7287,7404,7411,7414,7418,8504,11623,11670,11686,11694,11702,11710,11718,11726,11734,11742,12294,12348,12438,12447,12538,12543,12591,12686,12730,12799,19893,40943,40980,42124,42231,42507,42527,42539,42606,42725,42895,42999,43009,43013,43018,43042,43123,43187,43255,43259,43262,43301,43334,43388,43442,43492,43503,43518,43560,43586,43595,43631,43638,43642,43695,43697,43702,43709,43712,43714,43740,43754,43762,43782,43790,43798,43814,43822,44002,55203,55238,55291,64109,64217,64285,64296,64310,64316,64318,64321,64324,64433,64829,64911,64967,65019,65140,65276,65391,65437,65470,65479,65487,65495,65500,65547,65574,65594,65597,65613,65629,65786,66204,66256,66335,66368,66377,66421,66461,66499,66511,66717,66855,66915,67382,67413,67431,67589,67592,67637,67640,67644,67669,67702,67742,67826,67829,67861,67897,68023,68031,68096,68115,68119,68149,68220,68252,68295,68324,68405,68437,68466,68497,68680,68899,69404,69415,69445,69622,69687,69807,69864,69926,69956,70002,70006,70066,70084,70106,70108,70161,70187,70278,70280,70285,70301,70312,70366,70412,70416,70440,70448,70451,70457,70461,70480,70497,70708,70730,70751,70831,70853,70855,71086,71131,71215,71236,71338,71352,71450,71723,71935,72103,72144,72161,72163,72192,72242,72250,72272,72329,72349,72440,72712,72750,72768,72847,72966,72969,73008,73030,73061,73064,73097,73112,73458,74649,75075,78894,83526,92728,92766,92909,92975,93047,93071,94026,94032,100343,101106,110878,110930,110951,111355,113770,113788,113800,113817,123180,123214,123627,125124,126467,126495,126498,126500,126503,126514,126519,126521,126523,126530,126535,126537,126539,126543,126546,126548,126551,126553,126555,126557,126559,126562,126564,126570,126578,126583,126588,126590,126601,126619,126627,126633,126651,173782,177972,178205,183969,191456,195101};

bool is_unicode_Lo_char(uint32_t c) {
    auto index = std::lower_bound(kLoRangeA, kLoRangeA + 476, c) - kLoRangeA;
    if(c == kLoRangeA[index]) return true;
    index -= 1;
    if(index < 0) return false;
    return c >= kLoRangeA[index] && c <= kLoRangeB[index];
}


struct StrName {
    int index;
    StrName(): index(-1) {}
    StrName(int index): index(index) {}
    StrName(const char* s): index(get(s).index) {}
    StrName(const Str& s): index(get(s).index) {}
    inline const Str& str() const { return _r_interned[index]; }
    inline bool empty() const { return index == -1; }

    inline bool operator==(const StrName& other) const noexcept {
        return this->index == other.index;
    }

    inline bool operator!=(const StrName& other) const noexcept {
        return this->index != other.index;
    }

    inline bool operator<(const StrName& other) const noexcept {
        return this->index < other.index;
    }

    inline bool operator>(const StrName& other) const noexcept {
        return this->index > other.index;
    }

    static std::map<Str, int, std::less<>> _interned;
    static std::vector<Str> _r_interned;

    inline static StrName get(const Str& s){
        return get(s.c_str());
    }

    static StrName get(const char* s){
        auto it = _interned.find(s);
        if(it != _interned.end()) return StrName(it->second);
        int index = _r_interned.size();
        _interned[s] = index;
        _r_interned.push_back(s);
        return StrName(index);
    }
};

// declare static members
std::map<Str, int, std::less<>> StrName::_interned;
std::vector<Str> StrName::_r_interned;

template<>
struct std::hash<StrName> {
    inline size_t operator()(const StrName& name) const {
        return name.index;
    }
};

const StrName __class__ = StrName::get("__class__");
const StrName __base__ = StrName::get("__base__");
const StrName __new__ = StrName::get("__new__");
const StrName __iter__ = StrName::get("__iter__");
const StrName __str__ = StrName::get("__str__");
const StrName __repr__ = StrName::get("__repr__");
const StrName __getitem__ = StrName::get("__getitem__");
const StrName __setitem__ = StrName::get("__setitem__");
const StrName __delitem__ = StrName::get("__delitem__");
const StrName __contains__ = StrName::get("__contains__");
const StrName __init__ = StrName::get("__init__");
const StrName __json__ = StrName::get("__json__");
const StrName __name__ = StrName::get("__name__");
const StrName __len__ = StrName::get("__len__");

const StrName m_eval = StrName::get("eval");
const StrName m_self = StrName::get("self");
const StrName __enter__ = StrName::get("__enter__");
const StrName __exit__ = StrName::get("__exit__");

const StrName CMP_SPECIAL_METHODS[] = {
    StrName::get("__lt__"), StrName::get("__le__"), StrName::get("__eq__"),
    StrName::get("__ne__"), StrName::get("__gt__"), StrName::get("__ge__")
};

const StrName BINARY_SPECIAL_METHODS[] = {
    StrName::get("__add__"), StrName::get("__sub__"), StrName::get("__mul__"),
    StrName::get("__truediv__"), StrName::get("__floordiv__"),
    StrName::get("__mod__"), StrName::get("__pow__")
};

const StrName BITWISE_SPECIAL_METHODS[] = {
    StrName::get("__lshift__"), StrName::get("__rshift__"),
    StrName::get("__and__"), StrName::get("__or__"), StrName::get("__xor__")
};