#include "test_scaffold.h"
#include "gp/containers/array.hpp"
#include "gp/containers/vector.hpp"
#include "gp/ipc/envelope/cbor.hpp"
#include "gp/algorithms/tmp_manip.hpp"
#include "gp/functional/monostates.hpp"
#include "gp/utils/allocators/allocator.hpp"
#include <string>
#include <unordered_map>

extern void print_logs();

struct std_allocator : gp::allocator {
    using dbg_map = std::unordered_map<void*, size_t>;
    [[no_unique_address]] dbg_map debug_info;

    /**
    * @brief Allocates memory
    *
    * @param sz the amount of bytes to allocate
    * 
    * @return the allocated memory as a pointer on success
    * @return nullptr if it failed allocating
    */
    virtual void* allocate(size_t sz) {
        auto v = new char[sz];
        log_segment("data allocated", (std::to_string(sz) + " bytes @"+std::to_string((uintptr_t)v)).c_str());
        debug_info[v] = sz;
        return v;
    }

    /**
        * @brief Deallocates memory
        *
        * @param ptr the memory to deallocate
        * 
        * @return true if the memory was successfully deallocated
        * @return false if the memory was not deallocated
        */
    virtual bool deallocate(void* ptr) {
        log_segment("data deallocated", "Trying deallocation");
        log_segment("data deallocated", ("Target: @" + std::to_string((uintptr_t)ptr)).c_str());
        
        if(!debug_info.contains(ptr)) {
            print_logs();
            gp_config::assertion(false, "Double free detected");
        }
        
        delete (char*)ptr;
        log_segment("data deallocated", (std::to_string(debug_info[ptr]) + " bytes @"+std::to_string((uintptr_t)ptr)).c_str());
        debug_info.erase(ptr);
        return true;
    }

    /**
        * @brief Tries to reallocate memory
        *
        * @param ptr The memory to reallocate
        * @param sz The new size we want to give the memory
        * 
        * @return true if reallocation was successful
        * @return false if the reallocation failed
        */
    virtual bool try_reallocate(void*, size_t) {
        return false;
    }

    virtual ~std_allocator() = default;
};

std_allocator allocator;

enum class co_state {
    waiting_receive,
    waiting_send,
    data_received,
    data_sent
};

typedef gp::array<char, 16> identifier_t;
using fd_t = int;

struct packet_info {
    uint64_t attempts = 0;
    uint64_t sequence = 0;
    identifier_t co_id;
    gp::vector<char> data{allocator};
};

gp::vector<char>& push_as_cbor(gp::vector<char>& src, identifier_t& value) {
    gp::push_as_cbor(src, gp::cbor_tag_initiator{.as_integer = 37});
    gp::push_as_cbor(src, value.as_buffer());
    return src;
}

gp::vector<char>& push_as_cbor(gp::vector<char>& src, packet_info& value) {
    push_as_cbor(src, gp::cbor_tag_initiator{.as_integer = 1994});
    push_as_cbor(src, gp::cbor_array_initiator{4});
    push_as_cbor(src, value.sequence);
    push_as_cbor(src, value.attempts);
    push_as_cbor(src, value.co_id);
    push_as_cbor(src, value.data.as_buffer());
    return src;
}

namespace gp { template<>
gp::pair<gp::optional<packet_info>, parsing_state> read_cbor<packet_info>(parsing_state state, gp::allocator& alloc) {
    size_t seq, attempts;
    identifier_t uuid;
    gp::vector<char> data{alloc};
    log_segment("INFO", "Init stage");
    bool ok = true;

    auto array_parser = [&](parsing_state state, allocator& alloc){
        for(size_t idx : {0,1,2,3})
        switch(idx) {
            case 0:{
                log_segment("INFO", "Array stage 0");
                auto [v ,new_state] = read_cbor<uint64_t>(state, alloc);
                if(v.has_value()) {
                    seq = v.value();
                    return new_state;
                }
            }break;
            case 1:{
                log_segment("INFO", "Array stage 1");
                auto [v ,new_state] = read_cbor<uint64_t>(state, alloc);
                if(v.has_value()) {
                    attempts = v.value();
                    return new_state;
                }
            }break;
            case 2:{
                log_segment("INFO", "Array stage 2");
                auto [tg ,nc_state] = read_cbor<cbor_tag_initiator>(state, alloc);
                if(!tg.has_value()) break;
                if(tg.value().as_integer != 37) break;

                log_segment("INFO", "\tGet UUID");
                auto [v ,new_state] = read_cbor<gp::vector<char>>(nc_state, alloc);
                if(v.has_value()) {
                    log_segment("INFO", "\tUUID obtained");
                    for(size_t idx : {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}) {
                        uuid[idx] = v.value()[idx];
                    }
                    return new_state;
                }
                log_segment("INFO", "\tUUID not found");
            }break;
            case 3:{
                log_segment("INFO", "Array stage 3");
                auto [v ,new_state] = read_cbor<gp::vector<char>>(state, alloc);
                if(v.has_value()) {
                    log_segment("INFO", "Data copy");
                    data = v.value();
                    log_segment("INFO", "ready to return last stale");
                    return new_state;
                }
            }break;
        }
        ok &= false;
        log_segment("ok", ok ? "true" : "false");
        return state;
    };

    parsing_state nc_state = state;
    {
        log_segment("INFO", "Tag stage");
        auto [value, new_state] = read_cbor<cbor_tag_initiator>(nc_state, alloc);
        if(!value.has_value()) return {gp::nullopt, state};
        nc_state = new_state;
    }
    {
        log_segment("INFO", "Array info stage");
        auto new_state = read_cbor_array(nc_state, alloc, array_parser, [&](size_t sz){
            ok &= sz == 4;
            log_segment("ok", ok ? "true" : "false");
            return ok;
        });
        log_segment("INFO", "Parser returned... Testing");
        if(ok && new_state.size() != nc_state.size()) {
            log_segment("INFO", "Parsing terminated successfully");
            return {packet_info{.attempts = attempts, .sequence = seq, .data = gp::move(data)}, new_state};
        }
        else{
            log_segment("INFO", ("Parsing failed with ok=" + std::string(ok ? "true" : "false")).c_str());
            return {nullopt, state};
        }
    }
}}

struct packet_info_serialization_test : public test_scaffold {
	packet_info_serialization_test() {
        name = __FILE__ "@packet_info_serialization_test";
	}

	virtual int run() {
		packet_info item;
        item.sequence = 1;
        item.attempts = 2;
        for(auto& c : item.co_id) c = 1;
        for(auto idx : {0,1,2,3,4,5,6,7,8,9}) item.data.push_back(idx);

        gp::vector<char> serialized(allocator);

        push_as_cbor(serialized, item);

        log_segment("size", std::to_string(serialized.size()).c_str());

        gp_config::assertion(serialized.size() == 36, "serialization of the wrong size");

        return 0;
	}
};

append_test packet_info_serialization_test_impl(new packet_info_serialization_test());



struct packet_info_deserialization_test : public test_scaffold {
	packet_info_deserialization_test() {
        name = __FILE__ "@packet_info_deserialization_test";
	}

	virtual int run() {
		packet_info item;
        item.sequence = 1;
        item.attempts = 2;
        for(auto& c : item.co_id) c = 1;
        for(auto idx : {0,1,2,3,4,5,6,7,8,9}) item.data.push_back(idx);

        gp::vector<char> serialized(allocator);
        log_segment("INFO", "Serialization init");

        push_as_cbor(serialized, item);
        log_segment("INFO", "Item serialized");

        log_segment("size", std::to_string(serialized.size()).c_str());

        gp_config::assertion(serialized.size() == 36, "serialization of the wrong size");
        log_segment("INFO", "Item controlled");

        auto [value, state] = gp::read_cbor<packet_info>(serialized.as_buffer(), allocator);

        gp_config::assertion(value.has_value(), "deserialization failed");
        gp_config::assertion(!state.size(), "unprocessed state remains");
        gp_config::assertion(value.value().sequence == item.sequence, "comparison failed step 1");
        gp_config::assertion(value.value().attempts == item.attempts, "comparison failed step 2");
        gp_config::assertion(value.value().co_id == item.co_id, "comparison failed step 3");
        gp_config::assertion(value.value().data == item.data, "comparison failed step 4");
        return 0;
	}
};

append_test packet_info_deserialization_test_impl(new packet_info_deserialization_test());