#include "WASMStringView.hpp"
#include "WASMHelperFile.hpp"

wasm_func_t* ConstString_GetHash(WebAssemblyScriptResolver* resolver) {
    return WasmHelpers::CreateFunc<u32, const ArbUt::StringView*>(
        resolver, {[](WebAssemblyScriptResolver*, const ArbUt::StringView* sv) -> u32 { return sv->GetHash(); }});
}

wasm_func_t* ConstString_GetStr(WebAssemblyScriptResolver* resolver) {
    return WasmHelpers::CreateFunc<i32, const ArbUt::StringView*>(
        resolver, {[](WebAssemblyScriptResolver* resolver, const ArbUt::StringView* constString) -> i32 {
            // To allow webassembly to access the C String, we need to allocate it inside it's memory.
            // Length + 1 to make room for the '\0'
            auto stringPointer = resolver->AllocateMemory(constString->Length() + 1, std::alignment_of<const char>());

            // After we have the pointer to the memory allocated for the string, copy the string with specified length
            // to it, then suffix it with the null byte to end it.
            strncpy(reinterpret_cast<char*>(stringPointer.first), constString->c_str(), constString->Length());
            stringPointer.first[constString->Length()] = '\0';
            return stringPointer.second;
        }});
}

void WASMStringView::Register(ArbUt::Dictionary<std::string, wasm_func_t*>& externs,
                              WebAssemblyScriptResolver* resolver) {
    externs.Insert("const_string_get_hash", ConstString_GetHash(resolver));
    externs.Insert("const_string_get_str", ConstString_GetStr(resolver));
}