#!/usr/bin/env bash

############################################################################
#
#   reset-test-db.sh
#
#   Resets the MySQL test database for the bok-choy acceptance tests.
#
#   If it finds a cached schema and migration history, it will start
#   from the cached version to speed up migrations.
#
#   If no cached database exists, it will create one.  This can be
#   checked into the repo to speed up future tests.
#
#   Note that we do NOT want to re-use the cache between test runs!
#   A newer commit could introduce migrations that do not exist
#   in other commits, which could cause migrations to fail in the other
#   commits.
#
#   For this reason, we always use a cache that was committed to master
#   at the time the branch was created.
#
############################################################################

DB_CACHE_DIR="common/test/db_cache"

# Ensure the test database exists.
echo "CREATE DATABASE IF NOT EXISTS edxtest;" | mysql -u root

# Clear out the test database
#
# We are using the django-extensions's reset_db command which uses "DROP DATABASE" and
# "CREATE DATABASE" in case the tests are being run in an environment (e.g. devstack
# or a jenkins worker environment) that already ran tests on another commit that had
# different migrations that created, dropped, or altered tables.
echo "Issuing a reset_db command to the bok_choy MySQL database."
./manage.py lms --settings bok_choy reset_db --traceback --noinput

# If there are cached database schemas/data, load them
if [[ -f $DB_CACHE_DIR/bok_choy_schema.sql && -f $DB_CACHE_DIR/bok_choy_migrations_data.sql && -f $DB_CACHE_DIR/bok_choy_data.json ]]; then

    echo "Found the bok_choy DB cache files. Loading them into the database..."
    # Load the schema, then the data (including the migration history)
    echo "Loading the schema from the filesystem into the MySQL DB."
    mysql -u root edxtest < $DB_CACHE_DIR/bok_choy_schema.sql
    echo "Loading the migration data from the filesystem into the MySQL DB."
    mysql -u root edxtest < $DB_CACHE_DIR/bok_choy_migrations_data.sql
    echo "Loading the fixture data from the filesystem into the MySQL DB."
    ./manage.py lms --settings bok_choy loaddata $DB_CACHE_DIR/bok_choy_data.json

    # Re-run migrations to ensure we are up-to-date
    echo "Running the lms migrations on the bok_choy DB."
    ./manage.py lms --settings bok_choy migrate --traceback --noinput
    echo "Running the cms migrations on the bok_choy DB."
    ./manage.py cms --settings bok_choy migrate --traceback --noinput

# Otherwise, update the test database and update the cache
else
    echo "Did not find a bok_choy DB cache. Creating a new one from scratch."
    # Clean the cache directory
    rm -rf $DB_CACHE_DIR && mkdir -p $DB_CACHE_DIR

    # Re-run migrations on the test database
    echo "Issuing a migrate command to the bok_choy MySQL database for the lms django apps."
    ./manage.py lms --settings bok_choy migrate --traceback --noinput
    echo "Issuing a migrate command to the bok_choy MySQL database for the cms django apps."
    ./manage.py cms --settings bok_choy migrate --traceback --noinput

    # Dump the schema and data to the cache
    echo "Using the dumpdata command to save the fixture data to the filesystem."
    ./manage.py lms --settings bok_choy dumpdata > $DB_CACHE_DIR/bok_choy_data.json
    # dump_data does not dump the django_migrations table so we do it separately.
    echo "Saving the django_migrations table of the bok_choy DB to the filesystem."
    mysqldump -u root --no-create-info edxtest django_migrations > $DB_CACHE_DIR/bok_choy_migrations_data.sql
    echo "Saving the schema of the bok_choy DB to the filesystem."
    mysqldump -u root --no-data --skip-comments --skip-dump-date edxtest > $DB_CACHE_DIR/bok_choy_schema.sql
fi