module cuid2

import rand.musl
import rand.mt19937

fn test_cuid2() {
    // default prng(wyrand), default id length = 24
    mut g24 := new()
    uuid24 := g24.generate()
    assert uuid24.len == 24
    assert is_cuid(uuid24)

    // default prng(wyrand), id length = 2
    mut g2 := new(length: 2)
    uuid2 := g2.generate()
    assert uuid2.len == 2
    assert is_cuid(uuid2)

    // default prng(wyrand), id length = 32
    mut g32 := new(length: 32)
    uuid32 := g32.generate()
    assert uuid32.len == 32
    assert is_cuid(uuid32)

    // musl prng, id length = 28
    mut g_musl := new(prng: &musl.MuslRNG{}, length: 28)
    uuid_musl := g_musl.generate()
    assert uuid_musl.len == 28
    assert is_cuid(uuid_musl)

    // mt19937 prng, default id length = 24
    mut g_mt19937 := new(prng: &mt19937.MT19937RNG{})
    uuid_mt19937 := g_mt19937.generate()
    assert uuid_mt19937.len == 24
    assert is_cuid(uuid_mt19937)

    // successive calls
    // default prng(wyrand), default id length = 24
    mut g := new()
    mut ids := []string{}
    for id in g {
        eprintln(id)
        // id length should be default length(24)
        assert id.len == 24
        assert is_cuid(id)

        ids << id
        if ids.len == 5 {
            break
        }
    }

    // successive calls to g.next() in a row should be unique
    assert ids[0] != ids[1]
    assert ids[0] != ids[2]
    assert ids[0] != ids[3]
    assert ids[0] != ids[4]
    assert ids[1] != ids[2]
    assert ids[1] != ids[3]
    assert ids[1] != ids[4]
    assert ids[2] != ids[3]
    assert ids[2] != ids[4]
    assert ids[3] != ids[4]
}