#!/usr/bin/env bash
set -e

if [[ $# == 0 ]]; then
    MODE=dev
elif [[ $# == 1 ]]; then
    MODE=$1
else
    echo "Too many arguments"
    exit 1
fi

if [[ "$MODE" == "dev" ]]; then
    USERNAME=zulip
    DBNAME=zulip
    STATUS_FILE_NAME=migration_status_dev
elif [[ "$MODE" == "test" ]]; then
    USERNAME=zulip_test
    DBNAME=zulip_test
    STATUS_FILE_NAME=migration_status_test
else
    echo "Usage instructions"
    echo "Run with either no arguments (sets up devel db for local deploy--zulip with user zulip)"
    echo "or specify 'test'"
    exit 1
fi

set -x

POSTGRES_USER="postgres"
if [ "$(uname)" = "OpenBSD" ]; then
    POSTGRES_USER="_postgresql"
fi

ROOT_POSTGRES=(sudo -i -u "$POSTGRES_USER" psql)
DEFAULT_DB=""
if [ "$(uname)" = "Darwin" ]; then
    ROOT_POSTGRES=(psql)
    DEFAULT_DB="postgres"
fi

if [ "$(uname)" = "OpenBSD" ]; then
    DEFAULT_DB="postgres"
fi

VAGRANTUSERNAME=$(whoami)

SEARCH_PATH=zulip,public
PASSWORD=$("$(dirname "$0")/../../scripts/get-django-setting" LOCAL_DATABASE_PASSWORD)
DBNAME_BASE=${DBNAME}_base

if ! pg_isready -U "$POSTGRES_USER" -q; then
    set +x
    echo
    echo 'ERROR: PostgreSQL server is not running! Ensure the service is enabled.'
    # shellcheck disable=SC2016
    echo 'ERROR: Try `sudo service postgresql start`?'
    echo "ERROR: You can easily test if you fixed it using: pg_isready -U \$POSTGRES_USER"
    exit 1
fi

# We need to remove the stamp file indicating that the database
# is properly provisioned with migrations.
uuid_var_path=$("$(readlink -f "$(dirname "$0")/../../scripts/lib/zulip_tools.py")" get_dev_uuid)
rm -f "$uuid_var_path/$STATUS_FILE_NAME"

"${ROOT_POSTGRES[@]}" -v ON_ERROR_STOP=1 -e "$DEFAULT_DB" <<EOF
DO \$\$BEGIN
    CREATE USER $USERNAME;
EXCEPTION WHEN duplicate_object THEN
    RAISE NOTICE '$USERNAME user already exists';
END\$\$;
ALTER USER $USERNAME PASSWORD '$PASSWORD';
ALTER USER $USERNAME CREATEDB;
ALTER ROLE $USERNAME SET search_path TO $SEARCH_PATH;

DO \$\$BEGIN
    CREATE USER "$VAGRANTUSERNAME"; 
EXCEPTION WHEN duplicate_object THEN
    RAISE NOTICE '$VAGRANTUSERNAME user already exists';
END\$\$;
GRANT $USERNAME TO "$VAGRANTUSERNAME";
ALTER ROLE "$VAGRANTUSERNAME" SET search_path TO $SEARCH_PATH;
EOF

umask go-rw
PGPASS_PREFIX="*:*:*:$USERNAME:"
PGPASS_ESCAPED_PREFIX="*:\\*:\\*:$USERNAME:"
if ! grep -q "$PGPASS_ESCAPED_PREFIX" ~/.pgpass; then
    echo "$PGPASS_PREFIX$PASSWORD" >>~/.pgpass
else
    sed -i "s/$PGPASS_ESCAPED_PREFIX.*\$/$PGPASS_PREFIX$PASSWORD/" ~/.pgpass
fi
chmod go-rw ~/.pgpass

PGHOST=localhost PGUSER="$USERNAME" \
    "$(dirname "$0")/../../scripts/setup/terminate-psql-sessions" "$DBNAME" "$DBNAME_BASE"

psql -v ON_ERROR_STOP=1 -e -h localhost postgres "$USERNAME" <<EOF
DROP DATABASE IF EXISTS $DBNAME;
DROP DATABASE IF EXISTS $DBNAME_BASE;
CREATE DATABASE $DBNAME_BASE
EOF

psql -v ON_ERROR_STOP=1 -e -h localhost "$DBNAME_BASE" "$USERNAME" <<EOF
CREATE SCHEMA zulip;
EOF

"${ROOT_POSTGRES[@]}" -v ON_ERROR_STOP=1 -e "$DBNAME_BASE" <<EOF
CREATE EXTENSION pgroonga;

-- Work around https://github.com/pgroonga/pgroonga/issues/335
SELECT unnest(
    CASE WHEN current_setting('server_version_num')::integer >= 150000
        AND current_setting('pgroonga.enable_wal', TRUE) = 'on' IS NOT TRUE THEN
        ARRAY['ALTER SYSTEM SET pgroonga.enable_wal = ''on''', 'SELECT pg_reload_conf()']
    END
) \gexec
EOF

psql -v ON_ERROR_STOP=1 -e -h localhost postgres "$USERNAME" <<EOF
CREATE DATABASE $DBNAME TEMPLATE $DBNAME_BASE;
EOF

"$(dirname "$0")/../../scripts/setup/flush-memcached"

echo "Database created"