#pragma once
#include "adminive/adapter.hpp"
#include "adminive/concepts.hpp"
#include <cctype>
#include <concepts>
#include <map>
#include <set>
#include <stdexcept>
#include <string>
#include <string_view>
#include <tuple>
#include <type_traits>
#include <utility>
namespace adminive {
template <class T>
struct Type_Descriptor;
template <class T>
concept Described_Type = requires {
    { Type_Descriptor<std::remove_cvref_t<T>>::get() };
};
template <class T>
concept Reflected_Type = requires {
    { Reflection_Adapter<std::remove_cvref_t<T>>::field_count } -> std::convertible_to<std::size_t>;
};
template <auto Member>
struct Member_Pointer_Traits;
template <class Owner, class Member_Type, Member_Type Owner::*Member>
struct Member_Pointer_Traits<Member> {
    using owner_type = Owner;
    using member_type = Member_Type;
    static constexpr auto value = Member;
};
template <auto Member>
struct Member_Field_Accessor {
    using owner_type = typename Member_Pointer_Traits<Member>::owner_type;
    using member_type = typename Member_Pointer_Traits<Member>::member_type;
    static constexpr auto member = Member;
    template <class Object>
    static decltype(auto) get(Object& object) noexcept {
        return object.*Member;
    }
    template <class Object>
    static decltype(auto) get(const Object& object) noexcept {
        return object.*Member;
    }
};
template <class T, std::size_t Index>
struct Reflected_Field_Accessor {
    using owner_type = T;
    using reference_type = decltype(Reflection_Adapter<T>::template get<Index>(std::declval<T&>()));
    using const_reference_type = decltype(Reflection_Adapter<T>::template get<Index>(std::declval<const T&>()));
    using member_type = std::remove_cvref_t<reference_type>;
    static constexpr std::size_t index = Index;
    static_assert(std::is_lvalue_reference_v<reference_type>);
    static_assert(std::is_lvalue_reference_v<const_reference_type>);
    static decltype(auto) get(T& object) noexcept(noexcept(Reflection_Adapter<T>::template get<Index>(object))) {
        return Reflection_Adapter<T>::template get<Index>(object);
    }
    static decltype(auto) get(const T& object) noexcept(noexcept(Reflection_Adapter<T>::template get<Index>(object))) {
        return Reflection_Adapter<T>::template get<Index>(object);
    }
};
inline bool valid_data_name(std::string_view name) noexcept {
    if(name.empty()) {
        return false;
    }
    const auto first = static_cast<unsigned char>(name.front());
    if(!(std::isalpha(first) || name.front() == '_')) {
        return false;
    }
    for(const char value : name.substr(1)) {
        const auto character = static_cast<unsigned char>(value);
        if(!(std::isalnum(character) || value == '_')) {
            return false;
        }
    }
    return true;
}
inline std::string make_label(std::string_view name) {
    std::string result;
    result.reserve(name.size());
    bool uppercase = true;
    for(const char value : name) {
        if(value == '_') {
            result.push_back(' ');
            uppercase = true;
            continue;
        }
        result.push_back(uppercase ? static_cast<char>(std::toupper(static_cast<unsigned char>(value))) : value);
        uppercase = false;
    }
    return result;
}
struct Field_Metadata {
    std::string name;
    std::string label;
    std::string list_label;
    std::string description;
    std::string widget;
    std::string visible_on;
    std::map<std::string, std::string> enum_labels;
    bool editable{};
    bool creatable{};
    bool readable{true};
    bool sensitive{};
    bool include_default{true};
    bool visible{true};
    bool required{};
    bool list_visible{true};
    int order{-1};
    bool sortable{};
};
template <class Accessor, bool Managed_Writable = false, bool Synchronized = true>
class Field_Descriptor {
public:
    using field_descriptor_tag = void;
    using accessor_type = Accessor;
    using owner_type = typename Accessor::owner_type;
    using member_type = typename Accessor::member_type;
    static constexpr bool managed_writable = Managed_Writable;
    static constexpr bool synchronized = Synchronized;
    explicit Field_Descriptor(std::string name) {
        metadata_.name = std::move(name);
        metadata_.label = make_label(metadata_.name);
    }
    Field_Descriptor(std::string name, std::string label) {
        metadata_.name = std::move(name);
        metadata_.label = std::move(label);
    }
    explicit Field_Descriptor(Field_Metadata metadata) : metadata_(std::move(metadata)) {}
    auto editable() const {
        auto result = rebind<true, Synchronized>();
        result.metadata_.editable = true;
        return result;
    }
    auto creatable() const {
        auto result = rebind<true, Synchronized>();
        result.metadata_.creatable = true;
        return result;
    }
    auto read_write() const {
        return rebind<true, Synchronized>();
    }
    auto unsynchronized() const {
        return rebind<Managed_Writable, false>();
    }
    Field_Descriptor readable(bool value = true) const {
        auto result = *this;
        result.metadata_.readable = value;
        return result;
    }
    Field_Descriptor sensitive(bool value = true) const {
        auto result = *this;
        result.metadata_.sensitive = value;
        if(value) {
            result.metadata_.readable = false;
            result.metadata_.include_default = false;
        }
        return result;
    }
    Field_Descriptor include_default(bool value = true) const {
        auto result = *this;
        result.metadata_.include_default = value;
        return result;
    }
    Field_Descriptor visible(bool value = true) const {
        auto result = *this;
        result.metadata_.visible = value;
        return result;
    }
    Field_Descriptor required(bool value = true) const {
        auto result = *this;
        result.metadata_.required = value;
        return result;
    }
    Field_Descriptor list_visible(bool value = true) const {
        auto result = *this;
        result.metadata_.list_visible = value;
        return result;
    }
    Field_Descriptor label(std::string value) const {
        auto result = *this;
        result.metadata_.label = std::move(value);
        return result;
    }
    Field_Descriptor description(std::string value) const {
        auto result = *this;
        result.metadata_.description = std::move(value);
        return result;
    }
    Field_Descriptor widget(std::string value) const {
        auto result = *this;
        result.metadata_.widget = std::move(value);
        return result;
    }
    Field_Descriptor visible_on(std::string value) const {
        auto result = *this;
        result.metadata_.visible_on = std::move(value);
        return result;
    }
    Field_Descriptor list_label(std::string value) const {
        auto result = *this;
        result.metadata_.list_label = std::move(value);
        return result;
    }
    Field_Descriptor order(int value) const {
        auto result = *this;
        result.metadata_.order = value;
        return result;
    }
    Field_Descriptor sortable(bool value = true) const {
        auto result = *this;
        result.metadata_.sortable = value;
        return result;
    }
    template <auto Value>
        requires Enum_Type<std::remove_cv_t<decltype(Value)>>
    Field_Descriptor enum_label(std::string label) const {
        const auto name = enum_name(Value);
        if(name.empty()) {
            throw std::invalid_argument("enum adapter returned an empty value name");
        }
        auto result = *this;
        result.metadata_.enum_labels.insert_or_assign(std::string(name), std::move(label));
        return result;
    }
    Field_Descriptor enum_label(std::string value_name, std::string label) const {
        auto result = *this;
        result.metadata_.enum_labels.insert_or_assign(std::move(value_name), std::move(label));
        return result;
    }
    template <class Object>
        requires std::convertible_to<std::remove_reference_t<Object>*, owner_type*>
    decltype(auto) get(Object& object) const noexcept(noexcept(Accessor::get(object))) {
        return Accessor::get(object);
    }
    template <class Object>
        requires std::convertible_to<const std::remove_reference_t<Object>*, const owner_type*>
    decltype(auto) get(const Object& object) const noexcept(noexcept(Accessor::get(object))) {
        return Accessor::get(object);
    }
    const std::string& name() const noexcept {
        return metadata_.name;
    }
    const std::string& label() const noexcept {
        return metadata_.label;
    }
    const std::string& list_label() const noexcept {
        return metadata_.list_label.empty() ? metadata_.label : metadata_.list_label;
    }
    const std::string& description() const noexcept {
        return metadata_.description;
    }
    const std::string& widget() const noexcept {
        return metadata_.widget;
    }
    const std::string& visible_on() const noexcept {
        return metadata_.visible_on;
    }
    const std::map<std::string, std::string>& enum_labels() const noexcept {
        return metadata_.enum_labels;
    }
    bool is_editable() const noexcept {
        return metadata_.editable;
    }
    bool is_creatable() const noexcept {
        return metadata_.creatable;
    }
    bool is_readable() const noexcept {
        return metadata_.readable;
    }
    bool is_sensitive() const noexcept {
        return metadata_.sensitive;
    }
    bool includes_default() const noexcept {
        return metadata_.include_default;
    }
    bool is_visible() const noexcept {
        return metadata_.visible;
    }
    bool is_required() const noexcept {
        return metadata_.required;
    }
    int order() const noexcept {
        return metadata_.order;
    }
    bool is_sortable() const noexcept {
        return metadata_.sortable;
    }
    bool is_list_visible() const noexcept {
        return metadata_.list_visible;
    }
private:
    template <bool New_Writable, bool New_Synchronized>
    auto rebind() const {
        return Field_Descriptor<Accessor, New_Writable, New_Synchronized>(metadata_);
    }
    template <class, bool, bool>
    friend class Field_Descriptor;
    Field_Metadata metadata_;
};
template <class T>
concept Field_Descriptor_Type = requires {
    typename std::remove_cvref_t<T>::field_descriptor_tag;
    typename std::remove_cvref_t<T>::owner_type;
    typename std::remove_cvref_t<T>::member_type;
    typename std::remove_cvref_t<T>::accessor_type;
    { std::remove_cvref_t<T>::managed_writable } -> std::convertible_to<bool>;
    { std::remove_cvref_t<T>::synchronized } -> std::convertible_to<bool>;
};
template <auto Member>
auto field(std::string name) {
    return Field_Descriptor<Member_Field_Accessor<Member>>(std::move(name));
}
template <auto Member>
auto field(std::string name, std::string label) {
    return Field_Descriptor<Member_Field_Accessor<Member>>(std::move(name), std::move(label));
}
template <Reflected_Type T, std::size_t Index>
auto reflected_field() {
    static_assert(Index < static_cast<std::size_t>(Reflection_Adapter<T>::field_count));
    const std::string name(Reflection_Adapter<T>::template name<Index>());
    if(name.empty()) {
        throw std::invalid_argument("reflected field name must not be empty");
    }
    return Field_Descriptor<Reflected_Field_Accessor<T, Index>>(name);
}
template <Reflected_Type T, std::size_t Index>
auto reflected_field(std::string label) {
    static_assert(Index < static_cast<std::size_t>(Reflection_Adapter<T>::field_count));
    const std::string name(Reflection_Adapter<T>::template name<Index>());
    if(name.empty()) {
        throw std::invalid_argument("reflected field name must not be empty");
    }
    return Field_Descriptor<Reflected_Field_Accessor<T, Index>>(name, std::move(label));
}
struct No_Object_Validator {
    template <class T>
    void operator()(const T&) const noexcept {}
};
struct Object_List_Options {
    std::string id_label{"ID"};
    std::string create_label{"Create"};
    std::string edit_label{"Edit"};
    std::string delete_label{"Delete"};
    std::string actions_label{"Actions"};
    std::string confirm_label{"Confirm Changes"};
    std::string delete_confirm{"Delete this record?"};
    std::string view_status_label{"View status"};
    std::string management_label;
    std::string default_order_by;
    std::string default_order_dir{"asc"};
    bool user_reorderable_{};
    bool column_reorderable_{true};
};
template <class T, class Validator, Field_Descriptor_Type... Fields>
class Object_Descriptor {
public:
    using object_type = T;
    using validator_type = Validator;
    using fields_type = std::tuple<Fields...>;
    Object_Descriptor(std::string name, std::string label, Validator validator, std::tuple<Fields...> fields, Object_List_Options list_options = {}) : name_(std::move(name)), label_(std::move(label)), validator_(std::move(validator)), fields_(std::move(fields)), list_options_(std::move(list_options)) {}
    template <class New_Validator>
    auto validator(New_Validator value) const {
        return Object_Descriptor<T, New_Validator, Fields...>(name_, label_, std::move(value), fields_, list_options_);
    }
    Object_Descriptor label(std::string value) const {
        auto result = *this;
        result.label_ = std::move(value);
        return result;
    }
    Object_Descriptor id_label(std::string value) const {
        auto result = *this;
        result.list_options_.id_label = std::move(value);
        return result;
    }
    Object_Descriptor create_label(std::string value) const {
        auto result = *this;
        result.list_options_.create_label = std::move(value);
        return result;
    }
    Object_Descriptor edit_label(std::string value) const {
        auto result = *this;
        result.list_options_.edit_label = std::move(value);
        return result;
    }
    Object_Descriptor delete_label(std::string value) const {
        auto result = *this;
        result.list_options_.delete_label = std::move(value);
        return result;
    }
    Object_Descriptor actions_label(std::string value) const {
        auto result = *this;
        result.list_options_.actions_label = std::move(value);
        return result;
    }
    Object_Descriptor confirm_label(std::string value) const {
        auto result = *this;
        result.list_options_.confirm_label = std::move(value);
        return result;
    }
    Object_Descriptor delete_confirm(std::string value) const {
        auto result = *this;
        result.list_options_.delete_confirm = std::move(value);
        return result;
    }
    Object_Descriptor view_status_label(std::string value) const {
        auto result = *this;
        result.list_options_.view_status_label = std::move(value);
        return result;
    }
    Object_Descriptor management_label(std::string value) const {
        auto result = *this;
        result.list_options_.management_label = std::move(value);
        return result;
    }
    Object_Descriptor default_sort(std::string field_name, bool descending = false) const {
        auto result = *this;
        result.list_options_.default_order_by = std::move(field_name);
        result.list_options_.default_order_dir = descending ? "desc" : "asc";
        return result;
    }
    Object_Descriptor user_reorderable(bool value = true) const {
        auto result = *this;
        result.list_options_.user_reorderable_ = value;
        return result;
    }
    Object_Descriptor column_reorderable(bool value = true) const {
        auto result = *this;
        result.list_options_.column_reorderable_ = value;
        return result;
    }
    const std::string& name() const noexcept {
        return name_;
    }
    const std::string& label() const noexcept {
        return label_;
    }
    const Validator& object_validator() const noexcept {
        return validator_;
    }
    const std::tuple<Fields...>& fields() const noexcept {
        return fields_;
    }
    const Object_List_Options& list_options() const noexcept {
        return list_options_;
    }
private:
    std::string name_;
    std::string label_;
    Validator validator_;
    std::tuple<Fields...> fields_;
    Object_List_Options list_options_;
};
template <class Descriptor>
void validate_descriptor(const Descriptor& descriptor) {
    if(!valid_data_name(descriptor.name())) {
        throw std::invalid_argument("descriptor name must match [A-Za-z_][A-Za-z0-9_]*: " + descriptor.name());
    }
    std::set<std::string> field_names;
    std::apply([&](const auto&... field) {
        ([&] {
            if(!valid_data_name(field.name())) {
                throw std::invalid_argument("descriptor field name must match [A-Za-z_][A-Za-z0-9_]*: " + field.name());
            }
            if(!field_names.insert(field.name()).second) {
                throw std::invalid_argument("duplicate descriptor field name: " + field.name());
            }
        }(), ...);
    }, descriptor.fields());
    const auto& options = descriptor.list_options();
    if(options.default_order_dir != "asc" && options.default_order_dir != "desc") {
        throw std::invalid_argument("default sort direction must be 'asc' or 'desc'");
    }
    if(options.default_order_by.empty()) {
        return;
    }
    bool found{};
    bool sortable{};
    std::apply([&](const auto&... field) {
        ([&] {
            if(field.name() == options.default_order_by) {
                found = true;
                sortable = field.is_sortable();
            }
        }(), ...);
    }, descriptor.fields());
    if(!found) {
        throw std::invalid_argument("default sort field does not exist: " + options.default_order_by);
    }
    if(!sortable) {
        throw std::invalid_argument("default sort field is not sortable: " + options.default_order_by);
    }
}
template <class T, Field_Descriptor_Type... Fields>
auto object(std::string name, Fields... fields) {
    static_assert((std::convertible_to<T*, typename Fields::owner_type*> && ...));
    const auto label = make_label(name);
    return Object_Descriptor<T, No_Object_Validator, Fields...>(std::move(name), label, No_Object_Validator{}, std::tuple<Fields...>(std::move(fields)...));
}
template <class T, Field_Descriptor_Type... Fields>
auto object(std::string name, std::string label, Fields... fields) {
    static_assert((std::convertible_to<T*, typename Fields::owner_type*> && ...));
    return Object_Descriptor<T, No_Object_Validator, Fields...>(std::move(name), std::move(label), No_Object_Validator{}, std::tuple<Fields...>(std::move(fields)...));
}
struct Identity_Field_Customizer {
    template <std::size_t Index, Field_Descriptor_Type Field>
    auto operator()(Field value) const {
        return value;
    }
};
template <Reflected_Type T, class Customizer, std::size_t... Indexes>
auto reflected_object_with_impl(std::string name, std::string label, Customizer customizer, std::index_sequence<Indexes...>) {
    return object<T>(std::move(name), std::move(label), customizer.template operator()<Indexes>(reflected_field<T, Indexes>())...);
}
template <Reflected_Type T, class Customizer>
auto reflected_object_with(std::string name, Customizer customizer) {
    const auto label = make_label(name);
    return reflected_object_with_impl<T>(std::move(name), label, std::move(customizer), std::make_index_sequence<static_cast<std::size_t>(Reflection_Adapter<T>::field_count)>{});
}
template <Reflected_Type T, class Customizer>
auto reflected_object_with(std::string name, std::string label, Customizer customizer) {
    return reflected_object_with_impl<T>(std::move(name), std::move(label), std::move(customizer), std::make_index_sequence<static_cast<std::size_t>(Reflection_Adapter<T>::field_count)>{});
}
template <Reflected_Type T>
auto reflected_object(std::string name) {
    return reflected_object_with<T>(std::move(name), Identity_Field_Customizer{});
}
template <Reflected_Type T>
auto reflected_object(std::string name, std::string label) {
    return reflected_object_with<T>(std::move(name), std::move(label), Identity_Field_Customizer{});
}
template <Described_Type T>
auto describe() {
    auto descriptor = Type_Descriptor<std::remove_cvref_t<T>>::get();
    validate_descriptor(descriptor);
    return descriptor;
}
template <class T>
using Descriptor_Type = std::remove_cvref_t<decltype(Type_Descriptor<std::remove_cvref_t<T>>::get())>;
template <class T>
using Descriptor_Fields = typename Descriptor_Type<T>::fields_type;
template <class T, std::size_t Index>
using Descriptor_Field = std::tuple_element_t<Index, Descriptor_Fields<T>>;
template <Described_Type T>
consteval bool described_type_has_managed_writes();
template <class Field>
consteval bool field_has_managed_writes() {
    if constexpr(Field::managed_writable) {
        return true;
    } else if constexpr(Described_Type<typename Field::member_type>) {
        return described_type_has_managed_writes<typename Field::member_type>();
    } else {
        return false;
    }
}
template <Described_Type T, std::size_t... Indexes>
consteval bool described_type_has_managed_writes_impl(std::index_sequence<Indexes...>) {
    return (field_has_managed_writes<Descriptor_Field<T, Indexes>>() || ...);
}
template <Described_Type T>
consteval bool described_type_has_managed_writes() {
    return described_type_has_managed_writes_impl<T>(std::make_index_sequence<std::tuple_size_v<Descriptor_Fields<T>>>{});
}
}
#define ADMINIVE_FIELD(Type, Member) ::adminive::field<&Type::Member>(#Member)
#define ADMINIVE_FIELD_LABEL(Type, Member, Label) ::adminive::field<&Type::Member>(#Member, Label)
#define ADMINIVE_REFLECTED_FIELD(Type, Index) ::adminive::reflected_field<Type, Index>()
#define ADMINIVE_REFLECTED_FIELD_LABEL(Type, Index, Label) ::adminive::reflected_field<Type, Index>(Label)