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 // Copyright 2016 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //   https://www.apache.org/licenses/LICENSE-2.0
 //
 //   Unless required by applicable law or agreed to in writing, software
 //   distributed under the License is distributed on an "AS IS" BASIS,
 //   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 //   See the License for the specific language governing permissions and
 //   limitations under the License.
 
 #ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_
 #define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_
 
 #include <atomic>
 #include <cstddef>
 #include <cstdint>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "absl/base/config.h"
 #include "absl/time/internal/cctz/include/cctz/civil_time.h"
 #include "absl/time/internal/cctz/include/cctz/time_zone.h"
 #include "absl/time/internal/cctz/include/cctz/zone_info_source.h"
 #include "time_zone_if.h"
 #include "tzfile.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
 namespace time_internal {
 namespace cctz {
 
 // A transition to a new UTC offset.
 struct Transition {
   std::int_least64_t unix_time;   // the instant of this transition
   std::uint_least8_t type_index;  // index of the transition type
   civil_second civil_sec;         // local civil time of transition
   civil_second prev_civil_sec;    // local civil time one second earlier
 
   struct ByUnixTime {
     inline bool operator()(const Transition& lhs, const Transition& rhs) const {
       return lhs.unix_time < rhs.unix_time;
     }
   };
   struct ByCivilTime {
     inline bool operator()(const Transition& lhs, const Transition& rhs) const {
       return lhs.civil_sec < rhs.civil_sec;
     }
   };
 };
 
 // The characteristics of a particular transition.
 struct TransitionType {
   std::int_least32_t utc_offset;  // the new prevailing UTC offset
   civil_second civil_max;         // max convertible civil time for offset
   civil_second civil_min;         // min convertible civil time for offset
   bool is_dst;                    // did we move into daylight-saving time
   std::uint_least8_t abbr_index;  // index of the new abbreviation
 };
 
 // A time zone backed by the IANA Time Zone Database (zoneinfo).
 class TimeZoneInfo : public TimeZoneIf {
  public:
   // Factories.
   static std::unique_ptr<TimeZoneInfo> UTC();  // never fails
   static std::unique_ptr<TimeZoneInfo> Make(const std::string& name);
 
   // TimeZoneIf implementations.
   time_zone::absolute_lookup BreakTime(
       const time_point<seconds>& tp) const override;
   time_zone::civil_lookup MakeTime(const civil_second& cs) const override;
   bool NextTransition(const time_point<seconds>& tp,
                       time_zone::civil_transition* trans) const override;
   bool PrevTransition(const time_point<seconds>& tp,
                       time_zone::civil_transition* trans) const override;
   std::string Version() const override;
   std::string Description() const override;
 
  private:
   TimeZoneInfo() = default;
   TimeZoneInfo(const TimeZoneInfo&) = delete;
   TimeZoneInfo& operator=(const TimeZoneInfo&) = delete;
 
   bool GetTransitionType(std::int_fast32_t utc_offset, bool is_dst,
                          const std::string& abbr, std::uint_least8_t* index);
   bool EquivTransitions(std::uint_fast8_t tt1_index,
                         std::uint_fast8_t tt2_index) const;
   bool ExtendTransitions();
 
   bool ResetToBuiltinUTC(const seconds& offset);
   bool Load(const std::string& name);
   bool Load(ZoneInfoSource* zip);
 
   // Helpers for BreakTime() and MakeTime().
   time_zone::absolute_lookup LocalTime(std::int_fast64_t unix_time,
                                        const TransitionType& tt) const;
   time_zone::absolute_lookup LocalTime(std::int_fast64_t unix_time,
                                        const Transition& tr) const;
   time_zone::civil_lookup TimeLocal(const civil_second& cs,
                                     year_t c4_shift) const;
 
   std::vector<Transition> transitions_;  // ordered by unix_time and civil_sec
   std::vector<TransitionType> transition_types_;  // distinct transition types
   std::uint_fast8_t default_transition_type_;     // for before first transition
   std::string abbreviations_;  // all the NUL-terminated abbreviations
 
   std::string version_;      // the tzdata version if available
   std::string future_spec_;  // for after the last zic transition
   bool extended_;            // future_spec_ was used to generate transitions
   year_t last_year_;         // the final year of the generated transitions
 
   // We remember the transitions found during the last BreakTime() and
   // MakeTime() calls. If the next request is for the same transition we
   // will avoid re-searching.
   mutable std::atomic<std::size_t> local_time_hint_ = {};  // BreakTime() hint
   mutable std::atomic<std::size_t> time_local_hint_ = {};  // MakeTime() hint
 };
 
 }  // namespace cctz
 }  // namespace time_internal
 ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_

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