#include "matador/object/constraints_generator.hpp"
#include "matador/object/object.hpp"
#include "matador/object/repository.hpp"

#include <algorithm>

namespace matador::object {
constraints_generator::constraints_generator(std::vector<class constraint> &constraints, const repository& repo, object &obj)
: constraints_(constraints)
, repo_(repo)
, obj_(obj) {}

void constraints_generator::create_pk_constraint(const std::string& name) const {
  class constraint pk_constraint("PK_" + obj_.name());
  pk_constraint.options_ |= utils::constraints::PrimaryKey;
  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_.attributes_)) {
      pk_constraint.attr_ = &*pk_attr;
  }
  pk_constraint.owner_ = &obj_;
  constraints_.emplace_back(std::move(pk_constraint));
}

void constraints_generator::create_fk_constraint(const std::type_index& ti, const std::string& name) const {
  const auto result = repo_.basic_info(ti);
  if (!result) {
    return;
  }
  const auto *pk_attribute = result.value().get().primary_key_attribute();
  class constraint pk_constraint("FK_" + obj_.name() + "_" + name);
  pk_constraint.options_ |= utils::constraints::ForeignKey;
  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_.attributes_)) {
    pk_constraint.attr_ = &*pk_attr;
  }
  pk_constraint.owner_ = &obj_;
  pk_constraint.ref_column_name_ = pk_attribute->name();
  pk_constraint.ref_table_name_ = pk_attribute->owner() ? pk_attribute->owner()->name() : "";
  constraints_.emplace_back(std::move(pk_constraint));
}

void constraints_generator::create_unique_constraint(const std::string& name) const {
  class constraint pk_constraint("UK_" + obj_.name() + "_" + name);
  pk_constraint.options_ |= utils::constraints::Unique;
  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_.attributes_)) {
    pk_constraint.attr_ = &*pk_attr;
  }
  pk_constraint.owner_ = &obj_;
}

std::vector<attribute>::iterator constraints_generator::find_attribute_by_name(const std::string& name) const {
  return std::find_if(std::begin(obj_.attributes_), std::end(obj_.attributes_), [&name](const attribute& elem) {
    return elem.name() == name;
  });
}
}