#!/usr/bin/env tclsh

set sqlite_exec [expr {[info exists env(SQLITE_EXEC)] ? $env(SQLITE_EXEC) : "sqlite3"}]

proc evaluate_sql {sqlite_exec sql} {
    set command [list $sqlite_exec testing/testing.db $sql]
    set output [exec {*}$command]
    return $output
}

proc run_test {sqlite_exec sql expected_output} {
    set actual_output [evaluate_sql $sqlite_exec $sql]
    if {$actual_output ne $expected_output} {
        puts "Test FAILED: '$sql'"
        puts "returned '$actual_output'"
        puts "expected '$expected_output'"
        exit 1
    }
}

proc do_execsql_test {test_name sql_statements expected_outputs} {
    puts "Running test: $test_name"
    set combined_sql [join $sql_statements " "]
    set combined_expected_output [join $expected_outputs "\n"]
    run_test $::sqlite_exec $combined_sql $combined_expected_output
}

do_execsql_test select-const-1 {
  SELECT 1
} {1}

do_execsql_test select-const-2 {
  SELECT 2
} {2}

do_execsql_test select-avg {
  SELECT avg(age) FROM users;
} {50.396}

do_execsql_test select-sum {
  SELECT sum(age) FROM users;
} {503960}

do_execsql_test select-total {
  SELECT sum(age) FROM users;
} {503960}

do_execsql_test select-limit {
  SELECT id FROM users LIMIT 1;
} {1}

do_execsql_test select-count {
  SELECT count(id) FROM users;
} {10000}

do_execsql_test select-max {
  SELECT max(age) FROM users;
} {100}

do_execsql_test select-min {
  SELECT min(age) FROM users;
} {1}

do_execsql_test select-group-concat {
  SELECT group_concat(name) FROM products;
} {hat,cap,shirt,sweater,sweatshirt,shorts,jeans,sneakers,boots,coat,accessories}

do_execsql_test select-group-concat-with-delimiter {
  SELECT group_concat(name, ';') FROM products;
} {hat;cap;shirt;sweater;sweatshirt;shorts;jeans;sneakers;boots;coat;accessories}

do_execsql_test select-group-concat-with-column-delimiter {
  SELECT group_concat(name, id) FROM products;
} {hat2cap3shirt4sweater5sweatshirt6shorts7jeans8sneakers9boots10coat11accessories}

do_execsql_test select-string-agg-with-delimiter {
  SELECT string_agg(name, ',') FROM products;
} {hat,cap,shirt,sweater,sweatshirt,shorts,jeans,sneakers,boots,coat,accessories}

do_execsql_test select-string-agg-with-column-delimiter {
  SELECT string_agg(name, id) FROM products;
} {hat2cap3shirt4sweater5sweatshirt6shorts7jeans8sneakers9boots10coat11accessories}

do_execsql_test select-limit-0 {
  SELECT id FROM users LIMIT 0;
} {}

do_execsql_test pragma-cache-size {
  PRAGMA cache_size
} {-2000}


do_execsql_test cross-join {
    select * from users, products limit 1;
} {1|Jamie|Foster|dylan00@example.com|496-522-9493|62375\ Johnson\ Rest\ Suite\ 322|West\ Lauriestad|IL|35865|94|1|hat|79.0}

do_execsql_test cross-join-specific-columns {
    select first_name, price from users, products limit 1;
} {Jamie|79.0}

do_execsql_test realify {
    select price from products limit 1;
} {79.0}

do_execsql_test where-clause-eq {
    select last_name from users where id = 2000;
} {Rodriguez}

do_execsql_test where-clause-eq-string {
    select count(1) from users where last_name = 'Rodriguez';
} {61}

do_execsql_test where-clause-ne {
    select count(1) from users where id != 2000;
} {9999}

do_execsql_test where-clause-gt {
    select count(1) from users where id > 2000;
} {8000}

do_execsql_test where-clause-gte {
    select count(1) from users where id >= 2000;
} {8001}

do_execsql_test where-clause-lt {
    select count(1) from users where id < 2000;
} {1999}

do_execsql_test where-clause-lte {
    select count(1) from users where id <= 2000;
} {2000}

do_execsql_test where-clause-unary-true {
    select count(1) from users where 1;
} {10000}

# not correct? should be 0?
do_execsql_test where-clause-unary-false {
    select count(1) from users where 0;
} {0}

do_execsql_test where-clause-no-table-unary-true {
    select 1 where 1;
} {1}

do_execsql_test where-clause-no-table-unary-false {
    select 1 where 0;
} {}

do_execsql_test coalesce {
    select coalesce(NULL, 1);
} {1}

do_execsql_test coalesce-2 {
    select coalesce(NULL, NULL, 1);
} {1}

do_execsql_test coalesce-null {
    select coalesce(NULL, NULL, NULL);
} {NULL}

do_execsql_test coalesce-first {
    select coalesce(1, 2, 3);
} {1}

do_execsql_test coalesce-from-table {
    select coalesce(NULL, 1) from users limit 1;
} {1}

do_execsql_test coalesce-from-table-column {
    select coalesce(NULL, age) from users where age = 94 limit 1;
} {94}

do_execsql_test coalesce-from-table-multiple-columns {
    select coalesce(NULL, age), coalesce(NULL, id) from users where age = 94 limit 1;
} {94|1}