%% -------------------------------------------------------------------
%%
%% bdberl: DB API Tests
%% Copyright (c) 2008 The Hive.  All rights reserved.
%%
%% -------------------------------------------------------------------
-module(bdberl_SUITE).

-compile(export_all).

-include_lib("ct.hrl").

all() ->
    [open_should_create_database_if_none_exists,
     open_should_allow_opening_multiple_databases,
     close_should_fail_with_invalid_db_handle,
     get_should_fail_when_getting_a_nonexistant_record,
     get_should_return_a_value_when_getting_a_valid_record,
     put_should_succeed_with_manual_transaction,
     put_should_rollback_with_failed_manual_transaction,
     transaction_should_commit_on_success,
     transaction_should_abort_on_exception,
     transaction_should_abort_on_user_abort,
     update_should_save_value_if_successful,
     update_should_accept_args_for_fun,
     port_should_tune_transaction_timeouts,
     cursor_should_iterate, cursor_should_fail_if_not_open].


init_per_testcase(_TestCase, Config) ->
    {ok, Db} = bdberl:open("api_test.db", btree, [create, exclusive]),
    [{db, Db}|Config].

end_per_testcase(_TestCase, Config) ->
    ok = bdberl:close(?config(db, Config)),
    ok = file:delete("api_test.db").


open_should_create_database_if_none_exists(_Config) ->
    true = filelib:is_file("api_test.db").

open_should_allow_opening_multiple_databases(_Config) ->
    %% Open up another db -- should use dbref 1 as that's the first available
    {ok, 1} = bdberl:open("api_test2.db", btree).

close_should_fail_with_invalid_db_handle(_Config) ->
    {error, invalid_db} = bdberl:close(21000).

get_should_fail_when_getting_a_nonexistant_record(Config) ->
    not_found = bdberl:get(?config(db, Config), bad_key).

get_should_return_a_value_when_getting_a_valid_record(Config) ->
    Db = ?config(db, Config),
    ok = bdberl:put(Db, mykey, avalue),
    {ok, avalue} = bdberl:get(Db, mykey).

put_should_succeed_with_manual_transaction(Config) ->
    Db = ?config(db, Config),
    ok = bdberl:txn_begin(),
    ok = bdberl:put(Db, mykey, avalue),
    ok = bdberl:txn_commit(),
    {ok, avalue} = bdberl:get(Db, mykey).

put_should_rollback_with_failed_manual_transaction(Config) ->
    Db = ?config(db, Config),
    ok = bdberl:txn_begin(),
    ok = bdberl:put(Db, mykey, avalue),
    ok = bdberl:txn_abort(),
    not_found = bdberl:get(Db, mykey).

transaction_should_commit_on_success(Config) ->
    Db = ?config(db, Config),
    F = fun() -> bdberl:put(Db, mykey, avalue) end,
    {ok, ok} = bdberl:transaction(F),
    {ok, avalue} = bdberl:get(Db, mykey).

transaction_should_abort_on_exception(Config) ->
    Db = ?config(db, Config),

    F = fun() -> 
            bdberl:put(Db, mykey, should_not_see_this),
            throw(testing)
        end,

    {error, {transaction_failed, testing}} = bdberl:transaction(F),
    not_found = bdberl:get(Db, mykey).

transaction_should_abort_on_user_abort(Config) ->
    Db = ?config(db, Config),

    F = fun() -> 
            bdberl:put(Db, mykey, should_not_see_this),
            abort
        end,

    {error, transaction_aborted} = bdberl:transaction(F),
    not_found = bdberl:get(Db, mykey).

update_should_save_value_if_successful(Config) ->
    Db = ?config(db, Config),
    ok = bdberl:put(Db, mykey, avalue),

    F = fun(Key, Value) ->
            mykey = Key,
            avalue = Value,
            newvalue
        end,

    {ok, newvalue} = bdberl:update(Db, mykey, F),
    {ok, newvalue} = bdberl:get(Db, mykey).

update_should_accept_args_for_fun(Config) ->
    Db = ?config(db, Config),
    ok = bdberl:put(Db, mykey, avalue),

    F = fun(_Key, _Value, Args) ->
            look_at_me = Args, % This is all we are interested in
            newvalue
        end,

    {ok, newvalue} = bdberl:update(Db, mykey, F, look_at_me).

port_should_tune_transaction_timeouts(_Config) ->
    %% Test transaction timeouts
    {ok, 500000} = bdberl:get_txn_timeout(),
    ok = bdberl:set_txn_timeout(250000),
    {ok, 250000} = bdberl:get_txn_timeout().

cursor_should_iterate(Config) ->
    Db = ?config(db, Config),
    
    %% Store some sample values in the db
    ok = bdberl:put(Db, key1, value1),
    ok = bdberl:put(Db, key2, value2),
    ok = bdberl:put(Db, key3, value3),
    
    %% Validate that the cursor returns each value in order (ASSUME btree db)
    ok = bdberl:cursor_open(Db),
    {ok, key1, value1} = bdberl:cursor_next(),
    {ok, key2, value2} = bdberl:cursor_next(),
    {ok, key3, value3} = bdberl:cursor_next(),
    not_found = bdberl:cursor_next(),

    %% Validate that the "current" key is key3
    {ok, key3, value3} = bdberl:cursor_current(),

    %% Now move backwards (should jump to key2, since we are "on" key3)
    {ok, key2, value2} = bdberl:cursor_prev(),
    {ok, key1, value1} = bdberl:cursor_prev(),
    not_found = bdberl:cursor_prev(),
    
    ok = bdberl:cursor_close().

cursor_should_fail_if_not_open(Config) ->
    {error, no_cursor} = bdberl:cursor_next(),
    {error, no_cursor} = bdberl:cursor_prev(),
    {error, no_cursor} = bdberl:cursor_current(),
    {error, no_cursor} = bdberl:cursor_close().