#! /bin/bash

set -eo pipefail

PROG=$0

find() {
    local -r name="$1"
    local -r file="$2"

    awk \
        -v _s="$name" \
        '
            BEGIN {_s = tolower(_s)}

            /^[a-zA-Z]/ && tolower($1) ~ _s && NF >= 2 {
                n++
                s = $1
                p = $NF
                if (NF == 2) {
                    e = ""
                    u = ""
                } else if (NF == 3) {
                    e = $2
                    u = ""
                } else {
                    e = $2
                    u = $3
                } # TODO What would NF > 4 mean?

                printf("%d [O] s:\"%s\", e:\"%s\", u:\"%s\"\n", n, s, e, u) > "/dev/stderr"
                if (match(u, "@")) {
                    tmp = e
                    e = u
                    u = tmp
                    printf("%d [C] s:\"%s\", e:\"%s\", u:\"%s\"\n", n, s, e, u) > "/dev/stderr"
                }
                printf("%d s:\"%s\" e:\"%s\" u:\"%s\" %s\n", n, s, e, u, p)
            }
        ' \
        "$file"
}

main() {
    local -r default_file="$HOME"/._p/p
    local -r usage="Usage: $PROG [FILE] NAME"
    local name file records i meta data datum

    case "$#" in
        0)
            echo "$usage" >&2
            return 1;;
        1)
            file="$default_file"
            name="$1";;
        2)
            file="$1"
            name="$2";;
        *)
            echo "$usage" >&2
            return 1;;
    esac

    records=$(find "$name" "$file")
    meta=$(echo "$records" | awk '{print($1, $2, $3, $4)}')
    data=$(echo "$records" | awk '{print($1, $5)}')

    # XXX Even an empty result will count as one line after echo, so need to filter:
    case "$(echo "$records" | grep -vc '^$')" in
        0)
            echo '[ERROR] Found nothing.' >&2
            exit 1;;
        1)
            datum="$data";;
        *)
            i=$(echo "$meta" | column -t | fzf | awk '{print $1}')
            datum=$(echo "$data" | awk -v i="$i" 'NR == i');;
    esac

    # XXX Intentionally avoiding newline:
    echo "$datum" | awk '{printf "%s", $2}' | xsel -i -b -t 30000

}

main "$@"