#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
# YES_ASH

# **TL;DR RULES:**
# * no executables (for the most part)
# * no personal info (yours or otherwise)
# * no right-wing nonsense
# * no piracy or NSFW media
# * no command & control
# * no continuous integration
# * no backups, and no minecraft (for real)
# * nothing that's illegal in Germany

oxo() { ### @-
    ### upload files (or stdin) to [0x0.st.](https://0x0.st)
    ### this script exits with the number of failed uploads; up to 255 at once.
    ### file retention period (30 to 365 days) is only computed for arguments.
    ### directories are skipped. please review the terms of service
    ### [on the website](https://0x0.st) before uploading files.
    ###
    ### ```
    ### $ echo test | oxo
    ### https://0x0.st/sj2.txt
    ### oxo: successfully uploaded 1 file
    ### $ oxo ~/play/{hey,you,fake,empty}
    ### https://0x0.st/-3rz.txt
    ### oxo: exprires in 365 days: /home/notwa/play/hey
    ### https://0x0.st/-3ri.txt
    ### oxo: exprires in 365 days: /home/notwa/play/you
    ### oxo: no such file: /home/notwa/play/fake
    ### oxo: skipping empty file: /home/notwa/play/empty
    ### oxo: successfully uploaded 2 files
    ### oxo: failed to upload 2 files
    ### ```
    local succs=0
    local fails=0
    local f= s=

    local look='\033[1m%s\033[0m\n'
    local bad='\033[31m%s\033[0m\n'
    local warn='\033[1;33m%s\033[0m\n'
    local err='\033[1;31m%s\033[0m\n'

    if [ $# -eq 0 ]; then
        curl -F'file=@-' https://0x0.st && : $((succs+=1)) || : $((fails+=1))
    elif [ $# -gt 255 ]; then
        printf "$err" "oxo: too many arguments (max: 255)" >&2
        return 255
    else
        for f; do
            if [ ! -e "$f" ]; then
                printf "$bad" "oxo: no such file: $f" >&2
                : $((fails+=1))
            elif [ -d "$f" ]; then
                printf "$bad" "oxo: skipping directory: $f" >&2
                : $((fails+=1))
            elif [ ! -s "$f" ]; then
                printf "$bad" "oxo: skipping empty file: $f" >&2
                : $((fails+=1))
            else
                local kib="$(du -k "$f" | cut -f1)"

                # compute retention using (fixed point) integers only.
                # retention = (365 - 30) * ([file size] / [512 MiB] - 1)**3 + 30
                local a=$(( kib/16+1 ))
                local b=$(( (kib+64)/128-12288 ))
                local c=$(( a*a/16384 ))
                local d=$(( b*c/8192+3*kib/16+1-32768 ))
                local r=$(( (d*-335+16384)/32768+30 ))

                if ! cp -p "$f" /tmp/0x0; then
                    : $((fails+=1))
                    printf "$bad" "oxo: failed to copy file: $f" >&2
                elif ! curl -F'file=@/tmp/0x0' https://0x0.st; then
                    : $((fails+=1))
                    printf "$bad" "oxo: failed to upload file: $f" >&2
                else
                    : $((succs+=1))
                    printf "$look" "oxo: exprires in $r days: $f" >&2
                fi
                #rm -f /tmp/0x0
            fi
        done
    fi

    if [ $succs -gt 0 ]; then
        [ $fails -eq 0 ] && fmt="$look" || fmt="$warn"
        [ $succs -eq 1 ] && s= || s=s
        printf "$fmt" "oxo: successfully uploaded $succs file$s" >&2
    fi

    if [ $fails -gt 0 ]; then
        [ $fails -eq 1 ] && s= || s=s
        printf "$err" "oxo: failed to upload $fails file$s" >&2
    fi

    return $fails
}

[ -n "${preload+-}" ] || oxo "$@"