import flag

const posix_and_gnu_args_no_tail = ['-f']

const posix_and_gnu_args_tail = ['-f', 'tail']
const posix_and_gnu_args_tails = ['-f', 'tail0', 'tail1', 'tail2']

const skip_posix_and_gnu_args_tail = ['skipme', '-f', 'tail']
const skip_posix_and_gnu_args_tails = ['skipme', '-f', 'tail0', 'tail1', 'tail2']

struct ConfigTail {
    mix  bool
    path string @[tail]
}

struct ConfigTails {
    mix   bool
    paths []string @[tail]
}

fn test_flag_tail() {
    // Test `@[tail]` edge-cases
    config1, no_matches1 := flag.to_struct[ConfigTail](posix_and_gnu_args_tail)!
    assert config1.mix == false
    assert config1.path == 'tail'
    assert no_matches1 == ['-f']

    config2, no_matches2 := flag.to_struct[ConfigTails](posix_and_gnu_args_tails)!
    assert config2.mix == false
    assert config2.paths == ['tail0', 'tail1', 'tail2']
    assert no_matches2 == ['-f']

    config3, no_matches3 := flag.to_struct[ConfigTail](skip_posix_and_gnu_args_tail, skip: 1)!
    assert config3.mix == false
    assert config3.path == 'tail'
    assert no_matches3 == ['-f']

    config4, no_matches4 := flag.to_struct[ConfigTails](skip_posix_and_gnu_args_tails, skip: 1)!
    assert config4.mix == false
    assert config4.paths == ['tail0', 'tail1', 'tail2']
    assert no_matches4 == ['-f']

    config5, no_matches5 := flag.to_struct[ConfigTail](posix_and_gnu_args_tail, skip: 1)!
    assert config5.mix == false
    assert config5.path == 'tail'
    assert no_matches5 == []

    config6, no_matches6 := flag.to_struct[ConfigTails](posix_and_gnu_args_tails, skip: 1)!
    assert config6.mix == false
    assert config6.paths == ['tail0', 'tail1', 'tail2']
    assert no_matches6 == []

    config7, no_matches7 := flag.to_struct[ConfigTail](posix_and_gnu_args_no_tail)!
    assert config7.mix == false
    assert config7.path == ''
    assert no_matches7 == ['-f']

    config8, no_matches8 := flag.to_struct[ConfigTail](posix_and_gnu_args_no_tail, skip: 1)!
    assert config8.mix == false
    assert config8.path == ''
    assert no_matches8 == []
}