PkmnLib/src/ScriptResolving/AngelScript/ByteCodeHandling/IPkmnBinaryStream.hpp

#ifndef PKMNLIB_IPKMNBINARYSTREAM_HPP
#define PKMNLIB_IPKMNBINARYSTREAM_HPP

#include <Arbutils/Collections/Dictionary.hpp>
#include <Arbutils/StringView.hpp>
#include <CreatureLib/Battling/ScriptHandling/ScriptCategory.hpp>
#include <angelscript.h>

class IPkmnBinaryStream : public asIBinaryStream {
protected:
    size_t _angelScriptBound;

    IPkmnBinaryStream(size_t angelScriptBound) : _angelScriptBound(angelScriptBound) {}

public:
    virtual void WriteTypes(
        const ArbUt::Dictionary<ScriptCategory, ArbUt::Dictionary<ArbUt::StringView, AngelScriptTypeInfo* non_null>>& types,
        const ArbUt::Dictionary<ArbUt::StringView, asITypeInfo* non_null>& itemUseTypes,
        const ArbUt::Dictionary<ArbUt::StringView, asITypeInfo* non_null>& evolutionTypes) {
        // We serialize our types in the format
        // "[category(byte)][name(str)]\2[decl(str)]\2[name(str)]\2[decl(str)]\1[category(byte)]...."

        i16 categoryArr[1];
        for (const auto& dic : types) {
            // Write the category
            categoryArr[0] = (i16)dic.first;
            Write(categoryArr, sizeof(i16));
            for (const auto& inner : dic.second) {
                // Write the script name
                Write(inner.first.c_str(), sizeof(char) * inner.first.Length());
                // Write the divider
                Write("\2", sizeof(char));
                // Write the declaration of the script
                auto decl = inner.second->GetDecl();
                Write(decl, sizeof(char) * strlen(decl));
                // Write another divider.
                Write("\2", sizeof(char));
            }
            // Write the divider between categories.
            Write("\1", sizeof(char));
        }

        categoryArr[0] = (i16)-1;
        Write(categoryArr, sizeof(i16));
        for (const auto& inner : itemUseTypes) {
            // Write the script name
            Write(inner.first.c_str(), sizeof(char) * inner.first.Length());
            // Write the divider
            Write("\2", sizeof(char));
            // Write the declaration of the script
            auto decl = inner.second->GetName();
            Write(decl, sizeof(char) * strlen(decl));
            // Write another divider.
            Write("\2", sizeof(char));
        }
        // Write the divider between categories.
        Write("\1", sizeof(char));

        categoryArr[0] = (i16)-2;
        Write(categoryArr, sizeof(i16));
        for (const auto& inner : evolutionTypes) {
            // Write the script name
            Write(inner.first.c_str(), sizeof(char) * inner.first.Length());
            // Write the divider
            Write("\2", sizeof(char));
            // Write the declaration of the script
            auto decl = inner.second->GetName();
            Write(decl, sizeof(char) * strlen(decl));
            // Write another divider.
            Write("\2", sizeof(char));
        }
        // Write the divider between categories.
        Write("\1", sizeof(char));
    }

    virtual ArbUt::Dictionary<i16, ArbUt::Dictionary<ArbUt::StringView, u32>> ReadTypes() {
        _angelScriptBound = SIZE_MAX;
        ArbUt::Dictionary<i16, ArbUt::Dictionary<ArbUt::StringView, uint32_t>> types;
        i16 categoryArr[1];
        while (true) {
            // Every inner database starts with the category, of known size. Read that.
            auto read = Read(categoryArr, sizeof(i16));
            // If we haven't read anything, we are finished.
            if (read == 0) {
                break;
            }
            ArbUt::Dictionary<ArbUt::StringView, uint32_t> innerDb;

            // We don't know the sizes of the name and decl. Allocate 128 characters for them, as that should be enough.
            char name[128];
            char decl[128];
            size_t pos = 0;
            bool isDecl = false;

            while (true) {
                // Keep reading characters
                char cArr[1];
                Read(cArr, sizeof(char));
                auto c = cArr[0];
                // If we find a '\1' separator
                if (c == '\1') {
                    // and if we were reading the decl
                    if (isDecl) {
                        // Insert the name and decl into the dictionary. Close off the decl with eof as well.
                        decl[pos] = '\0';

                        innerDb.Set(ArbUt::StringView(name), ArbUt::StringView::CalculateHash(decl));
                    }
                    // If we have found \1, we are done with the current category, so break.
                    break;
                }
                // If we find a '\2' separator, we need to toggle between writing to name and writing to decl. If we
                // were writing a decl, also insert the name and decl into the dictionary.
                if (c == '\2') {
                    if (isDecl) {
                        // Insert the name and decl into the dictionary. Close off the decl with eof as well.
                        decl[pos] = '\0';
                        innerDb.Set(ArbUt::StringView(name), ArbUt::StringView::CalculateHash(decl));
                        // Reset our position and toggle back to name.
                        pos = 0;
                        isDecl = false;
                        continue;
                    } else {
                        // Close of the name with eof, reset position and toggle to decl.
                        name[pos] = '\0';
                        pos = 0;
                        isDecl = true;
                        continue;
                    }
                } else {
                    // If we haven't found any control character, just add the character to the thing we are writing to,
                    // and increment the position.
                    if (isDecl) {
                        decl[pos++] = c;
                    } else {
                        name[pos++] = c;
                    }
                }
            }
            types.Set(categoryArr[0], innerDb);
        }
        return types;
    }
};

#endif // PKMNLIB_IPKMNBINARYSTREAM_HPP