---
---
#!/bin/bash
set -o pipefail
set -o errexit

ALEF_DB="${ALEF_DB:-comments.db}"
ALEF_URL="{{ site.url }}"
ALEF_MODERATOR="{{ site.email }}"
ALEF_FROM="noreply@{{ site.url | remove: 'https://' | remove: 'http://' }}"

echo -en "Status: 200 OK\r\n"
echo -en "Content-type: text/plain;charset=UTF-8\r\n\r\n"

trap '
echo --
echo User Agent: $HTTP_USER_AGENT
echo IP Address: $REMOTE_ADDR
echo
echo $ALEF_URL
' EXIT

POST_STRING=$(cat)

# https://stackoverflow.com/a/37840948/
function urldecode() { : "${*//+/ }"; echo -e "${_//%/\\x}"; }

saveIFS=$IFS
IFS='=&'
parm=($POST_STRING)
IFS=$saveIFS

# https://stackoverflow.com/a/3919908/
for ((i=0; i<${#parm[@]}; i+=2)) do
	varname=var_$( echo ${parm[i]} | sed s/-/_/ )
	declare $varname="$(urldecode ${parm[i+1]})"
done

# Make sure mandatory fields are present
([ -z "$var_message" ] || [ -z "$var_name" ] || [ -z "$var_email" ]) && {
	echo "لطفا برای ثبت دیدگاه متن و نام و ایمیل را وارد کنید."
	echo "$ALEF_URL: missing mandatory form fields." >&2
	exit 1
}

# Anti-spam check (skip if ALEF_PUZZLE not configured)
[ -n "$ALEF_PUZZLE" ] && [ "$var_puzzle" != "$ALEF_PUZZLE" ] && {
	echo "معما رو درست حل نکردی رفیق. نمی‌شه، شرمنده."
	echo "$ALEF_URL: wrong puzzle." >&2
	exit 1
}

[ -n "$var_reply_to" ] && {
	op_email=$(sqlite3 "$ALEF_DB" \
		".param set :reply_to \"$var_reply_to\"" \
		"SELECT DISTINCT email FROM comments WHERE id = :reply_to OR legacy_id = :reply_to")
}

# Initialize DB if not exists
[ ! -f "$ALEF_DB" ] && {
	cat <<EOF | sqlite3 "$ALEF_DB"
CREATE TABLE IF NOT EXISTS comments (
	-- A unique ID for each comment
	id INTEGER PRIMARY KEY AUTOINCREMENT,
	-- For legacy ids from disqus and netlify
	legacy_id TEXT,
	-- ISO8601 strings with UTC/zulu timezone, try date --iso-8601=seconds --utc
	time TEXT NOT NULL,
	-- Comment author's name
	name TEXT NOT NULL,
	-- Comment author's email
	email TEXT NOT NULL,
	-- The page where the comment belongs to
	page_id TEXT NOT NULL,
	-- The ID of a parent comment
	reply_to TEXT,
	-- Some URL
	website TEXT,
	-- Whether this is a spam (wrong puzzle answer)
	spam INTEGER NOT NULL,
	-- The body of the comment
	message TEXT NOT NULL
);
EOF
}

# If file exists and is writable (RETURNING needs sqlite >= 3.35.0)
[ -w "$ALEF_DB" ] && NEW_ID=$(sqlite3 "$ALEF_DB" \
	".param set :name \"$var_name\"" \
	".param set :email \"$var_email\"" \
	".param set :page_id \"$var_page_id\"" \
	".param set :reply_to \"$var_reply_to\"" \
	".param set :website \"$var_website\"" \
	".param set :spam \"$spam\"" \
	".param set :message \"$var_message\"" \
	"INSERT INTO comments (time, name, email, page_id, reply_to, website, spam, message)
	 VALUES (datetime(), :name, :email, :page_id, :reply_to, :website, :spam, :message)
	 RETURNING id")

# Report success
echo دیدگاهت ثبت شد و با اولین بیلد وبسایت منتشر خواهد شد.

sub="${ALEF_URL}/$var_page_id.html#$NEW_ID"

# Convert internationalized header to RFC2047 format
from_author="$(mailutils flt2047 --charset=utf-8 'کامنتدونی')"
from_header="From: $from_author <${ALEF_FROM}>"

# mail is from mailutils package
[ -n "$ALEF_MODERATOR" ] && cat <<EOF | mail "$ALEF_MODERATOR" -s "دیدگاه جدید" \
	-a "$from_header" \
	-a "Content-Type: text/plain; charset=UTF-8"
${var_name} دیدگاه جدید گذاشت:

	$var_message

${sub}

--
کامنتدونی
EOF

[ -n "$op_email" ] && cat <<EOF | mail "$op_email" -s "دیدگاه جدید" \
	-a "$from_header" \
	-a "Content-Type: text/plain; charset=UTF-8"
${var_name} به دیدگاهت جواب داد:

	$var_message

${sub}

--
کامنتدونی
EOF