#!/usr/bin/env tclsh

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Basic single row delete test
do_execsql_test_on_specific_db {:memory:} delete-single-1 {
    CREATE TABLE t1(x INTEGER PRIMARY KEY);
    INSERT INTO t1 VALUES (1);
    INSERT INTO t1 VALUES (2);
    INSERT INTO t1 VALUES (3);
    DELETE FROM t1 WHERE x = 2;
    SELECT * FROM t1 ORDER BY x;
} {1 3}

# Test alternating delete-insert pattern to stress freelist
do_execsql_test_on_specific_db {:memory:} delete-insert-alternate-1 {
    CREATE TABLE t4(x INTEGER PRIMARY KEY);
    INSERT INTO t4 VALUES (1);
    INSERT INTO t4 VALUES (2);
    INSERT INTO t4 VALUES (3);
    DELETE FROM t4 WHERE x = 2;
    INSERT INTO t4 VALUES (4);
    DELETE FROM t4 WHERE x = 1;
    INSERT INTO t4 VALUES (5);
    SELECT * FROM t4 ORDER BY x;
} {3 4 5}

# Test deleting from both ends
do_execsql_test_on_specific_db {:memory:} delete-ends-1 {
    CREATE TABLE t5(x INTEGER PRIMARY KEY);
    INSERT INTO t5 VALUES (1);
    INSERT INTO t5 VALUES (2);
    INSERT INTO t5 VALUES (3);
    INSERT INTO t5 VALUES (4);
    INSERT INTO t5 VALUES (5);
    -- Delete from both ends
    DELETE FROM t5 WHERE x = 1;
    DELETE FROM t5 WHERE x = 5;
    SELECT * FROM t5 ORDER BY x;
} {2 3 4}

# Test delete-insert cycles with value reuse
do_execsql_test_on_specific_db {:memory:} delete-reuse-1 {
    CREATE TABLE t6(x INTEGER PRIMARY KEY);
    INSERT INTO t6 VALUES (1);
    INSERT INTO t6 VALUES (2);
    INSERT INTO t6 VALUES (3);
    DELETE FROM t6 WHERE x = 2;
    INSERT INTO t6 VALUES (2);  -- Reuse same value
    SELECT * FROM t6 ORDER BY x;
} {1 2 3}

# Test delete works when there are indexes
do_execsql_test_on_specific_db {:memory:} delete-all-with-indexes-1 {
    CREATE TABLE t(a PRIMARY KEY);
    CREATE INDEX tasc ON t(a);
    CREATE INDEX tdesc ON t(a DESC);
    INSERT INTO t VALUES (randomblob(1000));
    DELETE FROM t;
    SELECT * FROM t;
} {}