#!/usr/bin/env tclsh
set testdir [file dirname $argv0]
source $testdir/tester.tcl


do_execsql_test_on_specific_db {:memory:} simple-rollback {
    create table t (x);
    insert into t values (1);
    begin;
    insert into t values (2);
    rollback;
    select * from t;
} {1}

do_execsql_test_on_specific_db {:memory:} simple-rollback-2 {
    create table t (x);
    begin;
    insert into t values (1);
    insert into t values (2);
    rollback;
    select * from t;
} {}


do_execsql_test_on_specific_db {:memory:} rollback-after-update {
    create table t (x);
    insert into t values (1);
    insert into t values (2);
    begin;
    update t set x = x + 10;
    rollback;
    select * from t;
} {1 2}

do_execsql_test_on_specific_db {:memory:} rollback-after-delete {
    create table t (x);
    insert into t values (1);
    insert into t values (2);
    insert into t values (3);
    begin;
    delete from t where x = 2;
    rollback;
    select * from t order by x;
} {1 2 3}

do_execsql_test_on_specific_db {:memory:} rollback-mixed-operations {
    create table t (x);
    insert into t values (1);
    insert into t values (2);
    begin;
    insert into t values (3);
    update t set x = x + 10 where x = 1;
    delete from t where x = 2;
    rollback;
    select * from t order by x;
} {1 2}

# The point of this test was to test we drop dirty pages after rollback by inserting into another table so that 
# pages used are different.
do_execsql_test_on_specific_db {:memory:} insert-after-rollback {
    create table t (x);
    create table t2 (x);
    insert into t values (1);
    insert into t values (2);
    begin;
    insert into t values (3);
    update t set x = x + 10 where x = 1;
    delete from t where x = 2;
    rollback;
    insert into t2 values (1);
    select * from t2 order by x;
} {1}


do_execsql_test_on_specific_db {:memory:} schema-change-rollback {
    begin;
    create table t (x);
    insert into t values (1);
    rollback;
    PRAGMA integrity_check;
} {ok}

do_execsql_test_on_specific_db {:memory:} schema-change-rollback-version {
    begin;
    create table t (x);
    insert into t values (1);
    rollback;
    PRAGMA schema_version;
} {0}

do_execsql_test_on_specific_db {:memory:} schema-version-after-update {
    create table t (x);
    PRAGMA schema_version;
} {1}

do_execsql_test_on_specific_db {:memory:} schema-change-rollback-2 {
    begin;
    create table t (x);
    rollback;
    select tbl_name from sqlite_schema;
} {}

do_execsql_test_on_specific_db {:memory:} schema-change-rollback-2 {
    create table before (x);
    begin;
    create table t (x);
    rollback;
    create table after (x);
    select tbl_name from sqlite_schema;
} {before after}


do_execsql_test_on_specific_db {:memory:} schema-alter-rollback {
    create table t (x);
    begin;
    alter table t add column y;
    rollback;
    select sql from sqlite_schema;
} {"CREATE TABLE t (x)"}

do_execsql_test_on_specific_db {:memory:} schema-alter-rollback-and-repeat {
    create table t (x);
    begin;
    alter table t add column y;
    rollback;
    alter table t add column y;
    select sql from sqlite_schema;
} {"CREATE TABLE t (x, y)"}

if {[info exists ::env(SQLITE_EXEC)] && ($::env(SQLITE_EXEC) eq "scripts/limbo-sqlite3-index-experimental" || $::env(SQLITE_EXEC) eq "sqlite3")} {
    do_execsql_test_on_specific_db {:memory:} schema-create-index-rollback {
        create table t (x);
        begin;
        create index i on t(x);
        rollback;
        select sql from sqlite_schema;
    } {"CREATE TABLE t (x)"}
}


do_execsql_test_on_specific_db {:memory:} schema-drop-table-rollback {
    create table t (x);
    begin;
    drop table t; 
    rollback;
    select sql from sqlite_schema;
} {"CREATE TABLE t (x)"}


# TODO: add tests for:
# * create virtual table 
# * drop index
# * views...