import os
import runtime

fn test_physical_memory() {
    $if windows || linux || darwin || freebsd || openbsd {
        total := runtime.total_memory()!
        free := runtime.free_memory()!
        println('total memory: ${total}')
        println('free  memory: ${free}')
        assert total > 0 && free > 0
    } $else {
        total := runtime.total_memory()!
        _ := runtime.free_memory() or { assert err.msg().contains('not implemented') }
        assert total > 0
    }
}

fn test_nr_cpus() {
    nr_cpus := runtime.nr_cpus()
    println('     nr cpus: ${nr_cpus}')
    assert nr_cpus > 0
}

fn test_nr_jobs() {
    nr_jobs := runtime.nr_jobs()
    println('     nr jobs: ${nr_jobs}')
    assert nr_jobs > 0
}

fn test_nr_jobs_matches_nr_cpus_without_vjobs() {
    env := os.environ()
    had_vjobs := 'VJOBS' in env
    saved_vjobs := env['VJOBS']
    defer {
        if had_vjobs {
            os.setenv('VJOBS', saved_vjobs, true)
        } else {
            os.unsetenv('VJOBS')
        }
    }
    os.unsetenv('VJOBS')
    assert runtime.nr_jobs() == runtime.nr_cpus()
}

fn test_nr_jobs_uses_vjobs_override() {
    env := os.environ()
    had_vjobs := 'VJOBS' in env
    saved_vjobs := env['VJOBS']
    defer {
        if had_vjobs {
            os.setenv('VJOBS', saved_vjobs, true)
        } else {
            os.unsetenv('VJOBS')
        }
    }
    expected_jobs := runtime.nr_cpus() + 1
    os.setenv('VJOBS', expected_jobs.str(), true)
    assert runtime.nr_jobs() == expected_jobs
}

fn test_is_32bit() {
    x := runtime.is_32bit().str()
    println('    is_32bit: ${x}')
    assert x == 'true' || x == 'false'
}

fn test_is_64bit() {
    x := runtime.is_64bit().str()
    println('    is_64bit: ${x}')
    assert x == 'true' || x == 'false'
}

fn test_is_little_endian() {
    x := runtime.is_little_endian().str()
    println('       is_le: ${x}')
    assert x == 'true' || x == 'false'
}

fn test_is_big_endian() {
    x := runtime.is_big_endian().str()
    println('       is_be: ${x}')
    assert x == 'true' || x == 'false'
}

fn test_is_big_endian_different_than_is_little_endian() {
    assert runtime.is_big_endian() != runtime.is_little_endian()
}

fn test_is_32bit_different_than_is_64bit() {
    assert runtime.is_32bit() != runtime.is_64bit()
}