#include "wrap-string.hpp"
#include "wrap-vector.hpp"
#include "eng-malloc.hpp"
#include "luastack.hpp"
#include "luaconsole.hpp"
#include "util.hpp"

#include <cstring>
#include <iostream>

LuaConsole::LuaConsole() {
    clear_raw_input();
}

LuaConsole::~LuaConsole() {
}

static LuaConsole::StringVec split_words(const eng::string &raw) {
    LuaConsole::StringVec result;
    eng::string acc;
    for (char c : raw) {
        if ((c == ' ')||(c == '\n')||(c == '\r')) {
            if (!acc.empty()) {
                result.push_back(acc);
                acc = "";
            }
        } else {
            acc += c;
        }
    }
    if (!acc.empty()) {
        result.push_back(acc);
    }
    return result;
}

LuaConsole::StringVec LuaConsole::get_command() {
    StringVec result = words_;
    words_.clear();
    return result;
}

void LuaConsole::clear_raw_input() {
    raw_input_ = "";
    lines_ = 0;
    prompt_ = "> ";
}

void LuaConsole::add(eng::string line) {
    for (int i = 0; i < int(line.size()); i++) {
        if (line[i] == '\n') line[i] = ' ';
    }
    raw_input_ += line;
    raw_input_ += '\n';
    lines_ += 1;
    prompt_ = ">> ";
    words_.clear();

    // Try to interpret it as a slash-command.
    if ((lines_ == 1)&&(raw_input_[0] == '/')) {
        words_ = split_words(raw_input_.substr(1));
        if ((words_.size() == 1) && (sv::valid_int64(words_[0]))) {
            eng::string num = words_[0];
            words_.clear();
            words_.push_back("choose");
            words_.push_back(num);
        }
        clear_raw_input();
        return;
    }

    // Translate lua expression, deal with initial prefix.
    eng::string partial;
    eng::string lua_mode;
    if (sv::has_prefix(raw_input_, "?=")) {
        lua_mode = "luaprobe";
        partial = eng::string("return ") + raw_input_.substr(2);
    } else if (sv::has_prefix(raw_input_, "?")) {
        lua_mode = "luaprobe";
        partial = raw_input_.substr(1);
    } else if (sv::has_prefix(raw_input_, "=")) {
        lua_mode = "luainvoke";
        partial = eng::string("return ") + raw_input_.substr(1);
    } else {
        lua_mode = "luainvoke";
        partial = raw_input_;
    }

    // Try to parse the lua expression
    {
        LuaVar result;
        LuaExtStack LS(lua_state_, result);
        eng::string errmsg = LS.load(result, partial, "stdin");
        if (errmsg.empty()) {
            words_.push_back(lua_mode);
            words_.emplace_back(sv::rtrim(partial));
            clear_raw_input();
        } else if (errmsg.find("<eof>") != std::string::npos) {
            // We have an incomplete expression.
            // Do nothing, just let the user type more stuff.
        } else {
            words_.push_back("syntax");
            words_.push_back(errmsg);
            clear_raw_input();
        }
    }
}