#!/usr/bin/env bash

set -e

function new_msgid() {
	echo "<$(sha256sum "$file" | awk '{ print $1 }')-$(date +%s)>"
}

TO="jb55@jb55.com"
PRPATCH="$HOME/var/prpatch"
MBOX="$PRPATCH/out.mbox"
PATCHES="$PRPATCH/out"

rm -rf "$PRPATCH"
mkdir -p "$PATCHES"
mail="$(cat -)"
prlink="$(mail-prlink <<<"$mail")"
#threadid=$(<<<"$mail" grep -i '^message-id:' | cut -d: -f2-)
pr="$(<<<"$prlink" sed -En 's,.*github.com/([^/]+)/([^/]+)/pull/([0-9]+).*,\3,p')"
target="$(<<<"$prlink" sed -En 's,.*github.com/([^/]+)/([^/]+)/pull/([0-9]+).*,\2,p')"
replyto="$(grep -i '^reply-to:' <<<"$mail" | cut -d":" -f2- | tr -d '\n' || :)"
echo "$mail" > "$PRPATCH/mail"
<<<"$mail" mail-prpatch > "$MBOX"

# sometimes subject lines have linebreaks!?
sed -i"" '/^Subject:/ {N; s/\n / /}' "$MBOX"

git mailsplit -o"$PATCHES" "$MBOX"

file="$PATCHES"/0001

msgid=$(new_msgid)
threadid=$msgid
for file in "$PATCHES/"*
do
	if [ -n "$replyto" ]; then
		sed -i"" "1 a Cc: $replyto" "$file" 
	fi

	if [ -n "$prlink" ]; then
		sed -i"" "0,/^---/{s@^---@\nCloses: $prlink\n---@}" "$file" 
	fi

	if [ -n "$target" ]; then
		sed -i"" "s,\[PATCH,\[PATCH $target," "$file"
	fi

	sed -i"" "1 a To: $TO" "$file" 
	sed -i"" "1 a Message-ID: $msgid" "$file" 

	# build thread
	sed -i"" "1 a In-Reply-To: $threadid" "$file" 
	sed -i"" "1 a References: $threadid" "$file" 

	notmuch insert +inbox < "$file"

	msgid=$(new_msgid)
done