#!/usr/bin/env tclsh

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

if {[info exists ::env(SQLITE_EXEC)] && ($::env(SQLITE_EXEC) eq "scripts/limbo-sqlite3-index-experimental" || $::env(SQLITE_EXEC) eq "sqlite3")} {
    # Basic DROP INDEX functionality
    do_execsql_test_on_specific_db {:memory:} drop-index-basic-1 {
        CREATE TABLE t1(x INTEGER PRIMARY KEY);
        CREATE INDEX t_idx on t1 (x);
        INSERT INTO t1 VALUES (1);
        INSERT INTO t1 VALUES (2);
        DROP INDEX t_idx;
        SELECT count(*) FROM sqlite_schema WHERE type='index' AND name='t_idx';
    } {0}

    # Test DROP INDEX IF EXISTS on existing index
    do_execsql_test_on_specific_db {:memory:} drop-index-if-exists-1 {
        CREATE TABLE t2(x INTEGER PRIMARY KEY);
        CREATE INDEX t_idx2 on t2 (x);
        DROP INDEX IF EXISTS t_idx2;
        SELECT count(*) FROM sqlite_schema WHERE type='index' AND name='t_idx2';
    } {0}

    # Test DROP INDEX IF EXISTS on non-existent index
    do_execsql_test_on_specific_db {:memory:} drop-index-if-exists-2 {
        DROP TABLE IF EXISTS nonexistent_index;
        SELECT 'success';
    } {success}

    # Test dropping non-existant index produces an error
    do_execsql_test_error_content drop-index-no-index {
        DROP INDEX t_idx;
    } {"No such index: t_idx"}


    # Test dropping index after multiple inserts and deletes
    do_execsql_test_on_specific_db {:memory:} drop-index-after-ops-1 {
        CREATE TABLE t6(x INTEGER PRIMARY KEY);
        CREATE INDEX t_idx6 on t6 (x);
        INSERT INTO t6 VALUES (1);
        INSERT INTO t6 VALUES (2);
        DELETE FROM t6 WHERE x = 1;
        INSERT INTO t6 VALUES (3);
        DROP INDEX t_idx6;
        SELECT count(*) FROM sqlite_schema WHERE type='index' AND name='t_idx6';
    } {0}
}