Stage 3.4

src/core/core_booking.erl

@@ -0,0 +1,102 @@
+-module(core_booking).
+-include("records.hrl").
+
+-export([create/2, get_by_id/1, get_by_event_and_user/2, list_by_event/1, list_by_user/1]).
+-export([update_status/2, delete/1]).
+-export([generate_id/0]).
+
+%% Создание бронирования
+create(EventId, UserId) ->
+  Id = generate_id(),
+  Booking = #booking{
+    id = Id,
+    event_id = EventId,
+    user_id = UserId,
+    status = pending,
+    confirmed_at = undefined,
+    created_at = calendar:universal_time(),
+    updated_at = calendar:universal_time()
+  },
+
+  F = fun() ->
+    mnesia:write(Booking),
+    {ok, Booking}
+      end,
+
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+%% Получение бронирования по ID
+get_by_id(Id) ->
+  case mnesia:dirty_read(booking, Id) of
+    [] -> {error, not_found};
+    [Booking] -> {ok, Booking}
+  end.
+
+%% Получение бронирования по событию и пользователю
+get_by_event_and_user(EventId, UserId) ->
+  Match = #booking{event_id = EventId, user_id = UserId, _ = '_'},
+  case mnesia:dirty_match_object(Match) of
+    [] -> {error, not_found};
+    [Booking] -> {ok, Booking}
+  end.
+
+%% Список бронирований события
+list_by_event(EventId) ->
+  Match = #booking{event_id = EventId, _ = '_'},
+  Bookings = mnesia:dirty_match_object(Match),
+  {ok, Bookings}.
+
+%% Список бронирований пользователя
+list_by_user(UserId) ->
+  Match = #booking{user_id = UserId, _ = '_'},
+  Bookings = mnesia:dirty_match_object(Match),
+  {ok, Bookings}.
+
+%% Обновление статуса бронирования
+update_status(Id, Status) when Status =:= pending; Status =:= confirmed; Status =:= cancelled ->
+  F = fun() ->
+    case mnesia:read(booking, Id) of
+      [] ->
+        {error, not_found};
+      [Booking] ->
+        Updated = Booking#booking{
+          status = Status,
+          confirmed_at = case Status of
+                           confirmed -> calendar:universal_time();
+                           _ -> Booking#booking.confirmed_at
+                         end,
+          updated_at = calendar:universal_time()
+        },
+        mnesia:write(Updated),
+        {ok, Updated}
+    end
+      end,
+
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+%% Удаление бронирования (hard delete)
+delete(Id) ->
+  F = fun() ->
+    case mnesia:read(booking, Id) of
+      [] ->
+        {error, not_found};
+      [Booking] ->
+        mnesia:delete_object(Booking),
+        {ok, deleted}
+    end
+      end,
+
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+%% Внутренние функции
+generate_id() ->
+  base64:encode(crypto:strong_rand_bytes(16), #{mode => urlsafe, padding => false}).