#pragma once

#include <memory>
#include <cstdint>
#include <string>
#include <vector>
#include <map>
#include <set>
#include <limits>

#include <boost/optional.hpp>

namespace Preserves {
    template <typename T, typename Atom, ValueKind kind>
    class Atomic: public ValueImpl<T> {
    protected:
        Atom value;
    public:
        Atomic(Atom const& value) : value(value) {}
        Atom& _value() { return value; }
        Atom const& _value() const { return value; }
        ValueKind value_kind() const { return kind; }
    };

#define PRESERVES_ATOMIC_VALUE_CLASS(Name, a_t, r_t, VK, getter, extra) \
    template <typename T = class GenericEmbedded>                                               \
    class Name: public Atomic<T, a_t, VK> {                                    \
    public: \
        Name(a_t const& value) : Atomic<T, a_t, VK>(value) {} \
        boost::optional<r_t> getter() const override { return this->value; } \
        extra                                                           \
    }

    PRESERVES_ATOMIC_VALUE_CLASS(Boolean, bool, bool, ValueKind::Boolean, as_bool,
        BinaryWriter& write(BinaryWriter& w) const override {
            return w << this->_value();
        });
    PRESERVES_ATOMIC_VALUE_CLASS(Double, double, double, ValueKind::Double, as_double,
        BinaryWriter& write(BinaryWriter& w) const override {
            return w << this->_value();
        });
    PRESERVES_ATOMIC_VALUE_CLASS(Uint64, uint64_t, uint64_t, ValueKind::SignedInteger, as_unsigned,
        BinaryWriter& write(BinaryWriter& w) const override {
            return w << this->_value();
        }
        boost::optional<int64_t> as_signed() const override {
            if (this->value <= uint64_t(std::numeric_limits<int64_t>::max())) {
                return this->value;
            } else {
                return boost::none;
            }
        }
        boost::optional<double> as_double() const override {
            if (uint64_t(double(this->value)) == this->value) {
                return double(this->value);
            } else {
                return boost::none;
            }
        });
    PRESERVES_ATOMIC_VALUE_CLASS(Int64, int64_t, int64_t, ValueKind::SignedInteger, as_signed,
        BinaryWriter& write(BinaryWriter& w) const override {
            return w << this->_value();
        }
        boost::optional<uint64_t> as_unsigned() const override {
            if (this->value >= 0) {
                return this->value;
            } else {
                return boost::none;
            }
        }
        boost::optional<double> as_double() const override {
            if (int64_t(double(this->value)) == this->value) {
                return double(this->value);
            } else {
                return boost::none;
            }
        });
    PRESERVES_ATOMIC_VALUE_CLASS(BigNum, std::vector<uint8_t>, std::vector<uint8_t> const&, ValueKind::SignedInteger, as_bignum,
        BinaryWriter& write(BinaryWriter& w) const override {
            return w.bignum(this->_value());
        });
    PRESERVES_ATOMIC_VALUE_CLASS(String, std::string, std::string const&, ValueKind::String, as_string,
        BinaryWriter& write(BinaryWriter& w) const override {
            return w.string(this->_value());
        });
    PRESERVES_ATOMIC_VALUE_CLASS(ByteString, std::vector<uint8_t>, std::vector<uint8_t> const&, ValueKind::ByteString, as_bytes,
        BinaryWriter& write(BinaryWriter& w) const override {
            return w.bytes(this->_value());
        });
    PRESERVES_ATOMIC_VALUE_CLASS(Symbol, std::string, std::string const&, ValueKind::Symbol, as_symbol,
        BinaryWriter& write(BinaryWriter& w) const override {
            return w.symbol(this->_value());
        });

    template <typename T>
    class Record: public ValueImpl<T> {
    public:
        Value<T> labelValue;
        std::vector<Value<T>> fields;

        Record(Value<T> const& label) : labelValue(label), fields() {}
        Record(Value<T> const& label, std::vector<Value<T>> const& fields) : labelValue(label), fields(fields) {}
        ValueKind value_kind() const { return ValueKind::Record; }
        boost::optional<Value<T>> label() const override { return labelValue; }
        size_t size() const { return fields.size(); }
        boost::optional<Value<T>> get(size_t index) const {
            if (index < size()) {
                return fields[index];
            } else {
                return boost::none;
            }
        }
        bool add(Value<T> const& value) override {
            fields.push_back(value);
            return true;
        }
        bool set(size_t index, Value<T> const& value) override {
            if (index < size()) {
                fields[index] = value;
            }
            return false;
        }
        bool operator<(Record<T> const& other) const {
            if (labelValue < other.labelValue) return true;
            if (other.labelValue < labelValue) return false;
            return fields < other.fields;
        }
        BinaryWriter& write(BinaryWriter& w) const override {
            return w.record(labelValue, fields);
        }
    };

    template <typename T = class GenericEmbedded>
    class Sequence: public ValueImpl<T> {
    public:
        std::vector<Value<T>> values;

        Sequence() : values() {}
        Sequence(std::vector<Value<T>> const& values) : values(values) {}
        ValueKind value_kind() const { return ValueKind::Sequence; }
        boost::optional<std::vector<Value<T>> const&> as_sequence() const override {
            return values;
        }
        size_t size() const override { return values.size(); }
        boost::optional<Value<T>> get(size_t index) const override {
            if (index < size()) {
                return values[index];
            } else {
                return boost::none;
            }
        }
        bool add(Value<T> const& value) override {
            values.push_back(value);
            return true;
        }
        bool set(size_t index, Value<T> const& value) override {
            if (index < size()) {
                values[index] = value;
            }
            return false;
        }
        BinaryWriter& write(BinaryWriter& w) const override {
            return w.sequence(values);
        }
    };

    template <typename T = class GenericEmbedded>
    class Set: public ValueImpl<T> {
    public:
        std::set<Value<T>> values;

        Set() : values() {}
        Set(std::set<Value<T>> const& values) : values(values) {}
        ValueKind value_kind() const { return ValueKind::Set; }
        boost::optional<std::set<Value<T>> const&> as_set() const override {
            return values;
        }
        size_t size() const override { return values.size(); }
        bool contains(Value<T> const& key) const override { return values.count(key) > 0; }
        bool add(Value<T> const& value) override {
            return values.insert(value).second;
        }
        bool erase(Value<T> const& value) override {
            return values.erase(value) > 0;
        }
        BinaryWriter& write(BinaryWriter& w) const override {
            return w.set(values);
        }
    };

    template <typename T = class GenericEmbedded>
    class Dictionary: public ValueImpl<T> {
    public:
        std::map<Value<T>, Value<T>> values;

        Dictionary() : values() {}
        Dictionary(std::map<Value<T>, Value<T>> const& values) : values(values) {}
        ValueKind value_kind() const { return ValueKind::Dictionary; }
        boost::optional<std::map<Value<T>, Value<T>> const&> as_dictionary() const override {
            return values;
        }
        size_t size() const override { return values.size(); }
        bool contains(Value<T> const& key) const override { return values.count(key) > 0; }
        boost::optional<Value<T>> get(Value<T> const& key) const override {
            auto i = values.find(key);
            if (i == values.end()) return boost::none;
            return i->second;
        }
        bool set(Value<T> const& key, Value<T> const& value) override {
            return values.emplace(key, value).second;
        }
        bool erase(Value<T> const& key) override {
            return values.erase(key) > 0;
        }
        BinaryWriter& write(BinaryWriter& w) const override {
            return w.dictionary(values);
        }
    };

    template <typename T = class GenericEmbedded>
    class Embedded: public ValueImpl<T> {
    public:
        std::shared_ptr<T> value;

        Embedded(std::shared_ptr<T> const& value) : value(value) {}
        ValueKind value_kind() const { return ValueKind::Embedded; }
        boost::optional<std::shared_ptr<T>> as_embedded() const override {
            return value;
        }
        BinaryWriter& write(BinaryWriter& w) const override {
            w << BinaryTag::Embedded;
            return value->write(w);
        }
    };

    class GenericEmbedded: public Value<GenericEmbedded> {
    public:
        GenericEmbedded(std::shared_ptr<ValueImpl<GenericEmbedded>> p) :
            Value(p)
        {}

        static std::shared_ptr<GenericEmbedded> wrap(Value<> v) {
            return std::make_shared<GenericEmbedded>(v._impl()); 
        }

        BinaryWriter& write(BinaryWriter& w) const {
            return (*this)->write(w);
        }
    };

    template <typename T>
    class AnnotatedValue: public ValueImpl<T> {
        std::vector<Value<T>> anns;
        Value<T> underlying;

        friend class ValueImpl<T>;

    protected:
        Value<T> internal_annotate(std::shared_ptr<ValueImpl<T>> const& self, Value<T> const &ann) {
            if (self.use_count() == 1) {
                anns.push_back(ann);
                return self;
            } else {
                auto a = std::make_shared<AnnotatedValue<T>>(std::vector<Value<T>>(anns), underlying);
                a->anns.push_back(ann);
                return Value<T>(a);
            }
        }

    public:
        AnnotatedValue(std::vector<Value<T>> &&anns, Value<T> const& v) : anns(anns), underlying(v) {}

        ValueKind value_kind() const override { return underlying.value_kind(); }
        bool is_mutable() const override { return underlying.is_mutable(); }

        boost::optional<bool> as_bool() const override { return underlying.as_bool(); }
        boost::optional<double> as_double() const override { return underlying.as_double(); }
        boost::optional<uint64_t> as_unsigned() const override { return underlying.as_unsigned(); }
        boost::optional<int64_t> as_signed() const override { return underlying.as_signed(); }
        boost::optional<std::vector<uint8_t> const&> as_bignum() const override { return underlying.as_bignum(); }
        boost::optional<std::string const&> as_string() const override { return underlying.as_string(); }
        boost::optional<std::vector<uint8_t> const&> as_bytes() const override { return underlying.as_bytes(); }
        boost::optional<std::string const&> as_symbol() const override { return underlying.as_symbol(); }
        boost::optional<Record<T> const&> as_record() const override { return underlying.as_record(); }
        boost::optional<std::vector<Value<T>> const&> as_sequence() const override { return underlying.as_sequence(); }
        boost::optional<std::set<Value<T>> const&> as_set() const override { return underlying.as_set(); }
        boost::optional<std::map<Value<T>,Value<T>> const&> as_dictionary() const override { return underlying.as_dictionary(); }
        boost::optional<std::shared_ptr<T>> as_embedded() const override { return underlying.as_embedded(); }

        boost::optional<Value<T>> label() const override { return underlying.label(); } 
        size_t size() const override { return underlying.size(); }
        bool contains(Value<T> const& key) const override { return underlying.contains(key); }
        boost::optional<Value<T>> get(Value<T> const& key) const override { return underlying.get(key); }
        boost::optional<Value<T>> get(size_t index) const override { return underlying.get(index); }

        bool add(Value<T> const& item) override {
            return underlying->add(item);
        }
        bool set(Value<T> const& key, Value<T> const& value) override {
            return underlying->set(key, value);
        }
        bool set(size_t index, Value<T> const& value) override {
            return underlying->set(index, value);
        }
        bool erase(Value<T> const& key) override {
            return underlying->erase(key);
        }

        boost::optional<std::vector<Value<T>> const&> annotations() const override {
            return anns;
        }

        BinaryWriter& write(BinaryWriter &w) const override {
            return w.annotated(underlying, anns);
        }
    };

    template <typename T>
    Value<T> Value<T>::annotate(Value<T> const& ann) const {
        return p->internal_annotate(p, ann);
    }

    template <typename T>
    Value<T> ValueImpl<T>::internal_annotate(std::shared_ptr<ValueImpl<T>> const& self, Value<T> const &ann) {
        auto a = std::make_shared<AnnotatedValue<T>>(std::vector<Value<T>>(), Value<T>(self));
        a->anns.push_back(ann);
        return Value<T>(a);
    }

    template <typename T>
    Value<T> Value<T>::from_bool(bool b)
    {
        return Value<T>(new Boolean<T>(b));
    }

    template <typename T>
    Value<T> Value<T>::from_double(double d)
    {
        return Value<T>(new Double<T>(d));
    }

    template <typename T>
    Value<T> Value<T>::from_int(uint64_t i)
    {
        return Value<T>(new Uint64<T>(i));
    }

    template <typename T>
    Value<T> Value<T>::from_int(int64_t i) {
        return Value<T>(new Int64<T>(i));
    }

    template <typename T>
    Value<T> Value<T>::from_string(std::string const& s) {
        return Value<T>(new String<T>(s));
    }

    template <typename T>
    Value<T> Value<T>::sequence(std::vector<Value<T>> const& values) {
        return Value<T>(new Sequence<T>(values));
    }

    template <typename T>
    Value<T> Value<T>::from_embedded(std::shared_ptr<T> const& v) {
        return Value<T>(new Embedded<T>(v));
    }
}