#!/bin/bash

version=0.24
program=${0##*/}
progdir=${0%/*}
svn_url_base="https://svn.ietf.org/svn/tools/ietfdb"
if [ "$progdir" = "$program" ]; then progdir="."; fi

# ----------------------------------------------------------------------
function usage() {
    cat <<EOF
NAME
	$program - make new dev branches for the IETF sprint

SYNOPSIS
	$program [OPTIONS] [DEVELOPER [BRANCHNAME]]

DESCRIPTION
	Make new dev branches for sprint participants based on the
	content of the sprint registration page.  If given a specific
	developer name and optionally a branch name as arguments, make a
	new branch for the specified developer instead.  If run without
	arguments, the script assumes that it's being run on the host that
	holds the Trac wiki with the sprint signup pages.

EOF
    echo -e "OPTIONS"
    if [ "$(uname)" = "Linux" ]; then
        # shellcheck disable=SC2086
        # shellcheck disable=SC2016
        grep -E "^\s+[-][A-Za-z| -]+\*?\)\s+[A-Za-z].+#" "$0" | tr -s "\t|" "\t," | $sed -e 's/\)[ \t]+([A-Z]+)=\$2[^#]*#/=\1\t/' -e 's/\)[^#]*#/\t/'
    else
        # shellcheck disable=SC2086
        # shellcheck disable=SC2016
        grep -E "^\s+[-][A-Za-z| -]+\*?\)\s+[A-Za-z].+#" "$0" | $sed 's/\|.*\$2[^#]*#/	/' | $sed 's/\|.*\)[^#]*#/	/'
    fi
    cat <<EOF

FILES

AUTHOR
	Written by Henrik Levkowetz, <henrik@zinfandel.tools.ietf.org>

COPYRIGHT
	Copyright 2016 Henrik Levkowetz.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or (at
	your option) any later version. There is NO WARRANTY; not even the
	implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
	PURPOSE. See the GNU General Public License for more details.
	
EOF

}

# ----------------------------------------------------------------------
function die() {
    echo -e "\n$program: error: $*" >/dev/stderr
    exit 1
}

function warn() {
    echo "$program: Warning: $*" 1>&2
}

function note() {
    if [ -n "$VERBOSE" ]; then echo -e "$*"; fi
}

# ----------------------------------------------------------------------
function version() {
    echo -e "$program $version"
}

# ----------------------------------------------------------------------

function check_svn_path_exists() {
    local __resultvar=$1
    local __path=$2
    local myresult

    svn info "${__path}" >/dev/null 2>&1
    myresult=$?

    # shellcheck disable=SC2086
    eval $__resultvar="'$myresult'"
}

function mksvndir() {
    who=$1
    if [ "$2" ]; then dir=$2; else dir=$who; fi
    check_svn_path_exists exists "${svn_url_base}/personal/$dir"
    # shellcheck disable=SC2154
    if [ "$exists" != "0" ]; then
        $do echo "Creating personal directory area for IETF datatracker coding: /personal/$dir"
        $do svn mkdir "${svn_url_base}/personal/$dir" -m "Personal SVN dir for $who, for IETF datatracker code"
    else
        echo "Repository area personal/$dir is already in place."
    fi
}

function mksvntarget() {
    local who=$1
    local target=$2
    local source=$3
    local email=$4
    local name=$5

    check_svn_path_exists exists "${svn_url_base}/personal/$who/$target"
    if [ "$exists" != "0" ]; then
        $do echo "  creating $target branch for $who ($name)."
        $do svn cp "${svn_url_base}/$source" \
            "${svn_url_base}/personal/$who/$target/" \
            -m "New branch for $target"
        $do echo "New branch: ^/personal/$who/$target"
        if [ -n "$email" ]; then
            notify_user "$who" "$target" "$email" "$name"
        fi
    else
        $do echo "  branch personal/$who/$target already exists."
    fi
}

function notify_user() {
    local login=$1
    local target=$2
    local email=$3
    local name=$4

    $do mail "$name <$email>" -s "A new SVN branch for you for IETF datatracker coding${rev:+, based on $rev}." -b rjsparks@nostrum.com <<-EOF
		Hi,
                $msg
		This mail has been automatically generated by the $program script.

		A new SVN branch has been set up for you for IETF datatracker coding, at
		${svn_url_base}/personal/$login/$target
		${rev:+This branch is based on $rev.  }You can check it out by doing
		svn co ${svn_url_base}/personal/$login/$target

		There's also a database dump available at
		https://www.ietf.org/lib/dt/sprint/ietf_utf8.sql.gz -- this dump is served
		via CDN, and should hopefully be swifter to download than the alternatives.

		Please read the instructions about sprint coder setup at
		https://trac.ietf.org/tools/ietfdb/wiki/SprintCoderSetup
		--  both the workflow description and the details of setting up your
		environment.


		Best regards,

		       The IETF tools team (via the $program script)

	EOF
}

function get_sprinters_info() {
    local n=$1

    curl -L -s "https://trac.ietf.org/trac/ietfdb/wiki/IETF${n}SprintSignUp?format=txt" | \
        grep -E "^\|\|" | \
        grep -Ev "^\|\|\s+\|\|\s+" | \
        tail -n +2 | \
        python3 sprintcoders.py | \
        update "$progdir/sprint${n}.txt"

}

# ----------------------------------------------------------------------
trap 'echo "$program($LINENO): Command failed with error code $? ([$$] "$0" $*)"; exit 1' ERR

# ----------------------------------------------------------------------
# Option parsing

# Options
short_options=hm:M:nsvV
long_options=help,meeting=,message=,dry-run,sprint,verbose,version

# Default values
num=""
msg=""
do=""

if [ "$(uname)" = "Linux" ]; then
    # shellcheck disable=SC2086
    # shellcheck disable=SC2048
    if ! args=$(getopt -o $short_options --long $long_options -n $program -- $SV $*); then
        die "Terminating..." >&2
        exit 1
    fi
    # shellcheck disable=SC2086
    eval set -- $args
    sed="sed -r"
else
    # Darwin, BSDs
    # shellcheck disable=SC2086
    # shellcheck disable=SC2048
    if ! args=$(getopt -o$short_options $SV $*); then
        die "Terminating..." >&2
        exit 1
    fi
    # shellcheck disable=SC2086
    set -- $args
    sed="sed -E"
fi

while true; do
    case "$1" in
    -h | --help)
        usage
        exit
        ;; # Show this help, then exit
    -m | --meeting)
        num=$2
        shift
        ;; # Specify the IETF meeting number
    -M | --message)
        msg=$2
        shift
        ;; # Specify extra message text
    -n | --dry-run) do="echo -- ==>" ;; # Only show what would be done
    -s | --sprint) SPRINT=1 ;; # Make branches for sprint sign-ups
    -v | --verbose) VERBOSE=1 ;; # Be more talkative
    -V | --version)
        version
        exit
        ;; # Show program version, then exit
    --)
        shift
        break
        ;;
    *) die "Internal error, inconsistent option specification: '$1'" ;;
    esac
    shift
done

# ----------------------------------------------------------------------
# The program itself

who=""
tag=$(svn log -v ${svn_url_base}/tags/dev/ --limit 1 | grep '/tags/' | awk '{print $2}')

source="${tag:1}"
target="${tag##*/}"
rev="dev tag $target"

[ "$1" ] && who="$1"
[ "$2" ] && target="${target%.dev*}-$2"

if [ -z "${who}${SPRINT}" ]; then die "Specify either individual developer name or --sprint"; fi

cd $progdir || exit

if [ "$who" ]; then
    mksvndir "$who"
    mksvntarget "$who" "$target" "$source"
fi
if [ "$SPRINT" ]; then
    [ "$msg" ] && msg="
$msg
"
    [ "$num" ] || num=$(curl -L -s "https://tools.ietf.org/meta/current-ietf-number.txt")
    for n in $(seq $((num - 3)) "$num"); do
        get_sprinters_info "$n"
    done

    # shellcheck disable=SC2046
    # shellcheck disable=SC2012
    # shellcheck disable=SC2162
    # sed -E (regexp extended) breaks this usage on MacOS 10.15, so back to regular sed.
    cat $(ls $progdir/sprint*.txt | tail -n 2) $progdir/extras.txt | \
            sed -e 's/[ \t]*$//' -e 's/[ \t]+/ /g' | \
            sort | uniq | \
            while read login email name; do
        echo ""
        echo "$login ($name <$email>):"
        mksvndir "$login"
        mksvntarget "$login" "$target" "$source" "$email" "$name"
    done
fi