#
# bash autocomplete, that can work with:
# a) --help of program
#
# Also you may like:
# $ bind "set completion-ignore-case on"
# $ bind "set show-all-if-ambiguous on"
#
# It uses bash-completion dynamic loader.

# Known to work with bash 3.* with programmable completion and extended
# pattern matching enabled (use 'shopt -s extglob progcomp' to enable
# these if they are not already enabled).
shopt -s extglob

export _CLICKHOUSE_COMPLETION_LOADED=1

CLICKHOUSE_QueryProcessingStage=(
    complete
    fetch_columns
    with_mergeable_state
    with_mergeable_state_after_aggregation
)

CLICKHOUSE_Format=(
    CapnProto
    PostgreSQLWire
    MySQLWire
    JSONStringsEachRowWithProgress
    JSONEachRowWithProgress
    JSONCompact
    JSON
    CSV
    Vertical
    ODBCDriver2
    PrettySpaceNoEscapes
    Pretty
    JSONCompactStrings
    PrettyNoEscapes
    ArrowStream
    TabSeparatedWithNames
    Parquet
    Arrow
    PrettyCompact
    AvroConfluent
    ORC
    PrettyCompactNoEscapes
    RawBLOB
    Template
    MsgPack
    JSONCompactEachRow
    CustomSeparated
    TemplateIgnoreSpaces
    Markdown
    XML
    ProtobufSingle
    JSONCompactStringsEachRowWithNamesAndTypes
    TSKV
    TabSeparated
    JSONStringEachRow
    JSONStringsEachRow
    TSVRaw
    Values
    TabSeparatedWithNamesAndTypes
    PrettyCompactMonoBlock
    TSVWithNamesAndTypes
    Avro
    RowBinaryWithNamesAndTypes
    LineAsString
    Native
    JSONCompactEachRowWithNamesAndTypes
    PrettySpace
    Regexp
    TSV
    JSONEachRow
    CustomSeparatedIgnoreSpaces
    CSVWithNames
    JSONStrings
    Null
    TabSeparatedRaw
    TSVWithNames
    Protobuf
    RowBinary
    JSONAsString
    JSONCompactStringsEachRow
)

function _clickhouse_bin_exist()
{ [ -x "$1" ] || command -v "$1" >& /dev/null; }

function _clickhouse_quote()
{
    local quoted=${1//\'/\'\\\'\'};
    printf "'%s'" "$quoted"
}

# Extract every option (everything that starts with "-") from the --help dialog.
function _clickhouse_get_options()
{
    "$@" --help 2>&1 | awk -F '[ ,=<>]' '{ for (i=1; i <= NF; ++i) { if (substr($i, 0, 1) == "-" && length($i) > 1) print $i; } }' | sort -u
}

function _complete_for_clickhouse_generic_bin_impl()
{
    local prev=$1 && shift

    case "$prev" in
        -C|--config-file|--config)
            return 1
            ;;
        --stage)
            COMPREPLY=( $(compgen -W "${CLICKHOUSE_QueryProcessingStage[*]}" -- "$cur") )
            return 1
            ;;
        --format|--input-format|--output-format)
            COMPREPLY=( $(compgen -W "${CLICKHOUSE_Format[*]}" -- "$cur") )
            return 1
            ;;
        --host)
            COMPREPLY=( $(compgen -A hostname -- "$cur") )
            return 1
            ;;
        # Argh...  This looks like a bash bug...
        # Redirections are passed to the completion function
        # although it is managed by the shell directly...
        '<'|'>'|'>>'|[12]'>'|[12]'>>')
            return 1
            ;;
    esac

    return 0
}

function _complete_for_clickhouse_generic_bin()
{
    local cur prev
    eval local cmd="$( _clickhouse_quote "$1" )"
    _clickhouse_bin_exist "$cmd" || return 0

    COMPREPLY=()
    _get_comp_words_by_ref cur prev

    if _complete_for_clickhouse_generic_bin_impl "$prev"; then
        COMPREPLY=( $(compgen -W "$(_clickhouse_get_options "$cmd")" -- "$cur") )
    fi

    return 0
}

function _complete_clickhouse_generic()
{
    local bin=$1 && shift
    local f=${1:-_complete_for_clickhouse_generic_bin}
    local o=(
        -o default
        -o bashdefault
        -o nospace
        -F "$f"
        "$bin"
    )
    complete "${o[@]}"
}

function _complete_clickhouse_bootstrap_main()
{
    local runtime=/usr/share/bash-completion/bash_completion
    if ! type _get_comp_words_by_ref >& /dev/null && [[ -f $runtime ]]; then
        source $runtime
    fi
    type _get_comp_words_by_ref >& /dev/null || return 0
}
_complete_clickhouse_bootstrap_main "$@"