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#pragma once

#include "openvic-simulation/types/IdentifierRegistry.hpp"

namespace OpenVic {
   struct ModifierManager;

   struct ModifierEffect : HasIdentifier {
      friend struct ModifierManager;

      enum class format_t {
         RAW_DECIMAL,
         PERCENTAGE_DECIMAL,
         INT
      };

   private:
      /* If true, positive values will be green and negative values will be red.
       * If false, the colours will be switced.
       */
      const bool positive_good;
      const format_t format;

      // TODO - format/precision, e.g. 80% vs 0.8 vs 0.800, 2 vs 2.0 vs 200%

      ModifierEffect(std::string_view new_identifier, bool new_positive_good, format_t new_format);

   public:
      ModifierEffect(ModifierEffect&&) = default;

      bool get_positive_good() const;
      format_t get_format() const;
   };

   struct ModifierValue {
      friend struct ModifierManager;

      using effect_map_t = decimal_map_t<ModifierEffect const*>;

   private:
      effect_map_t values;

   public:
      ModifierValue();
      ModifierValue(effect_map_t&& new_values);
      ModifierValue(ModifierValue const&);
      ModifierValue(ModifierValue&&);

      ModifierValue& operator=(ModifierValue const&);
      ModifierValue& operator=(ModifierValue&&);

      /* Removes effect entries with a value of zero. */
      void trim();
      size_t get_effect_count() const;

      fixed_point_t get_effect(ModifierEffect const* effect, bool* successful = nullptr);
      bool has_effect(ModifierEffect const* effect) const;

      ModifierValue& operator+=(ModifierValue const& right);
      ModifierValue operator+(ModifierValue const& right) const;
      ModifierValue operator-() const;
      ModifierValue& operator-=(ModifierValue const& right);
      ModifierValue operator-(ModifierValue const& right) const;

      friend std::ostream& operator<<(std::ostream& stream, ModifierValue const& value);
   };

   struct Modifier : HasIdentifier, ModifierValue {
      friend struct ModifierManager;

      using icon_t = uint8_t;

   private:
      /* A modifier can have no icon (zero). */
      const icon_t icon;

      Modifier(std::string_view new_identifier, ModifierValue&& new_values, icon_t new_icon);

   public:
      Modifier(Modifier&&) = default;

      icon_t get_icon() const;
   };

   struct ModifierInstance {

   private:
      Modifier const& modifier;
      Date expiry_date;

      ModifierInstance(Modifier const& modifier, Date expiry_date);

   public:
      Modifier const& get_modifier() const;
      Date const& get_expiry_date() const;
   };

   template<typename Fn>
   concept ModifierEffectValidator = std::predicate<Fn, ModifierEffect const&>;

   struct ModifierManager {

   private:
      IdentifierRegistry<ModifierEffect> modifier_effects;
      IdentifierRegistry<Modifier> modifiers;

      /* effect_validator takes in ModifierEffect const& */
      NodeTools::key_value_callback_t _modifier_effect_callback(ModifierValue& modifier,
         NodeTools::key_value_callback_t default_callback, ModifierEffectValidator auto effect_validator) const;

   public:
      ModifierManager();

      bool add_modifier_effect(std::string_view identifier, bool province_good,
         ModifierEffect::format_t format = ModifierEffect::format_t::PERCENTAGE_DECIMAL);
      IDENTIFIER_REGISTRY_ACCESSORS(modifier_effect)

      bool add_modifier(std::string_view identifier, ModifierValue&& values, Modifier::icon_t icon);
      IDENTIFIER_REGISTRY_ACCESSORS(modifier)

      bool setup_modifier_effects();

      NodeTools::node_callback_t expect_validated_modifier_value_and_default(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         NodeTools::key_value_callback_t default_callback,
         ModifierEffectValidator auto effect_validator) const;
      NodeTools::node_callback_t expect_validated_modifier_value(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         ModifierEffectValidator auto effect_validator) const;

      NodeTools::node_callback_t expect_modifier_value_and_default(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         NodeTools::key_value_callback_t default_callback) const;
      NodeTools::node_callback_t expect_modifier_value(
         NodeTools::callback_t<ModifierValue&&> modifier_callback) const;

      NodeTools::node_callback_t expect_whitelisted_modifier_value_and_default(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         string_set_t const& whitelist,
         NodeTools::key_value_callback_t default_callback) const;
      NodeTools::node_callback_t expect_whitelisted_modifier_value(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         string_set_t const& whitelist) const;

      NodeTools::node_callback_t expect_modifier_value_and_key_map_and_default(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         NodeTools::key_value_callback_t default_callback,
         NodeTools::key_map_t&& key_map) const;
      NodeTools::node_callback_t expect_modifier_value_and_key_map(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         NodeTools::key_map_t&& key_map) const;

      template<typename... Args>
      NodeTools::node_callback_t expect_modifier_value_and_key_map_and_default(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         NodeTools::key_value_callback_t default_callback,
         NodeTools::key_map_t&& key_map,
         Args... args) const {
         NodeTools::add_key_map_entries(key_map, args...);
         return expect_modifier_value_and_key_map_and_default(modifier_callback, default_callback, std::move(key_map));
      }

      template<typename... Args>
      NodeTools::node_callback_t expect_modifier_value_and_keys_and_default(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         NodeTools::key_value_callback_t default_callback,
         Args... args) const {
         return expect_modifier_value_and_key_map_and_default(modifier_callback, default_callback, {}, args...);
      }
      template<typename... Args>
      NodeTools::node_callback_t expect_modifier_value_and_keys(
         NodeTools::callback_t<ModifierValue&&> modifier_callback,
         Args... args) const {
         return expect_modifier_value_and_key_map_and_default(modifier_callback, NodeTools::key_value_invalid_callback, {}, args...);
      }
   };
}