defmodule Durango.Dsl.Function.Names do

  @functions [
    #{name, arity}
    # https://docs.arangodb.com/3.3/AQL/Functions/TypeCast.html
    document:             1,
    document:             2,
    collections:          0,
    has:                  2,
    to_bool:              1,
    to_number:            1,
    to_string:            1,
    to_array:             1,
    to_list:              1,
    is_null:              1,
    is_bool:              1,
    is_number:            1,
    is_string:            1,
    is_array:             1,
    is_list:              1,
    is_object:            1,
    is_document:          1,
    is_datestring:        1,
    typename:             1,
    # https://docs.arangodb.com/3.3/AQL/Functions/String.html
    char_length:          1,
    concat:               1..255,
    concat_separator:     2..255,
    contains:             2..3,
    count:                1,
    lenght:               1,
    find_first:           2..4,
    find_last:            2..4,
    json_parse:           1,
    json_stringify:       1,
    left:                 2,
    like:                 2..3,
    lower:                1,
    ltrim:                1..2,
    md5:                  1,
    random_token:         1,
    regex_test:           2..3,
    regex_replace:        3..4,
    reverse:              1,
    right:                2,
    rtrim:                1..2,
    sha1:                 1,
    split:                2..3,
    substitute:           2..4,
    substring:            2..3,
    trim:                 1..2,
    upper:                1,
    # https://docs.arangodb.com/3.3/AQL/Functions/Numeric.html
    abs:                  1,
    acos:                 1,
    asin:                 1,
    atan:                 1..2,
    atan2:                2,
    average:              1,
    ceil:                 1,
    cos:                  1,
    degrees:              1,
    exp:                  1,
    exp2:                 1,
    floor:                1,
    log:                  1,
    log2:                 1,
    log10:                1,
    max:                  1,
    median:               1,
    min:                  1,
    percentile:           2..3,
    pi:                   0,
    pow:                  2,
    radians:              1,
    rand:                 0,
    range:                2..3,
    round:                1,
    sin:                  1,
    sqrt:                 1,
    stddev_population:    1,
    stddev_sample:        1,
    sum:                  1,
    tan:                  1,
    variance_population:  1,
    variance_sample:      1,
    date_now:             0,
    date_iso8601:         1,
    date_timestamp:       1,
    date_dayofweek:       1,
    date_year:            1,
    date_month:           1,
    date_day:             1,
    date_hour:            1,
    date_minute:          1,
    date_second:          1,
    date_millisecond:     1,
    date_dateofyear:      1,
    date_isoweek:         1,
    date_leapyear:        1,
    date_quarter:         1,
    date_days_in_month:   1,
    date_format:          2,
    date_add:             3,
    date_subtract:        3,
    date_diff:            3..4,
    date_compare:         3..4,
    # https://docs.arangodb.com/3.3/AQL/Functions/Array.html
    append:               2..3,
    first:                1,
    flatten:              1..2,
    intersection:         2..255,
    last:                 1,
    minus:                2..255,
    nth:                  2,
    outersection:         2..255,
    pop:                  1,
    position:             2..3,
    push:                 2..3,
    remove_nth:           2,
    remove_value:         2..3,
    remove_values:        2,
    reverse:              1,
    shift:                1,
    slice:                2..3,
    union:                2..255,
    union_distinct:       2..255,
    unique:               2..255,
    unshift:              2..3,
    # https://docs.arangodb.com/3.3/AQL/Functions/Document.html
    attributes:           1..3,
    has:                  2,
    is_same_collection:   2,
    keep:                 2..255,
    matches:              2..3,
    merge:                1..255,
    merge_recursive:      1..255,
    parse_identifier:     1,
    translate:            2..3,
    unset:                2..255,
    unset_recursive:      2..255,
    values:               1..2,
    zip:                  2,
    near:                 3..5,
    within:               4..5,
    within_rectangle:     5,
    distance:             4,
    is_in_polygon:        3,
    # https://docs.arangodb.com/3.3/AQL/Functions/Fulltext.html
    fulltext:             3..4,
    # https://docs.arangodb.com/3.3/AQL/Functions/Miscellaneous.html
    not_null:             1..255,
    first_list:           1,
    first_document:       1,
    collection_count:     1,
    current_user:         0,
    hash:                 1,
    fail:                 1,
    call:                 2,
    apply:                2,
    noopt:                1,
    passthru:             1,
    sleep:                1,
    v8:                   1,
  ]

  def functions(), do: @functions
  def names_list(), do: Keyword.keys(@functions)

end