#!/bin/bash
set -euo pipefail

PLUGIN_DIR="$(cd "$(dirname "$0")/.." && pwd)"
SCRIPT="$PLUGIN_DIR/scripts/da-integration/alt_mysql_native_backup_restore.sh"
TMP_DIR="$(mktemp -d)"
trap 'rm -rf "$TMP_DIR"' EXIT

fail() {
  echo "FAIL: $*" >&2
  exit 1
}

# Source only the parsing functions, without triggering main() (the script
# guards its own main() call behind a BASH_SOURCE check, see Task 3 Step 1).
# shellcheck source=/dev/null
source "$SCRIPT"

# --- Real example content, copied verbatim from example_backup/psy/backup/psy_it301.conf ---
CONF_FILE="$TMP_DIR/psy_it301.conf"
cat > "$CONF_FILE" <<'EOF'
accesshosts=0=localhost
db_collation=DEFAULT_CHARACTER_SET_NAME=utf8mb3&DEFAULT_COLLATION_NAME=utf8mb3_general_ci&SCHEMA_NAME=psy_it301
psy_it301=accesshosts=localhost&alter_priv=Y&alter_routine_priv=Y&create_priv=Y&create_routine_priv=Y&create_tmp_table_priv=Y&create_view_priv=Y&delete_priv=Y&drop_priv=Y&event_priv=Y&execute_priv=Y&index_priv=Y&insert_priv=Y&lock_tables_priv=Y&passwd=%2A8E2A6497279CF1B7F115E213B9904BD32703F4EF&plugin=mysql_native_password&references_priv=Y&select_priv=Y&show_view_priv=Y&trigger_priv=Y&update_priv=Y
EOF

# url_decode
[ "$(url_decode '%2A8E2A6497279CF1B7F115E213B9904BD32703F4EF')" = "*8E2A6497279CF1B7F115E213B9904BD32703F4EF" ] \
  || fail "url_decode did not decode %2A correctly"

# native_conf_field
QS="accesshosts=localhost&select_priv=Y&passwd=%2Aabc&plugin=mysql_native_password"
[ "$(native_conf_field "$QS" passwd)" = "%2Aabc" ] || fail "native_conf_field did not extract passwd"
[ "$(native_conf_field "$QS" plugin)" = "mysql_native_password" ] || fail "native_conf_field did not extract plugin"
[ "$(native_conf_field "$QS" missing_field)" = "" ] || fail "native_conf_field should return empty for a missing field"

# native_conf_privilege_list
PRIVS="$(native_conf_privilege_list "$QS")"
[ "$PRIVS" = "SELECT" ] || fail "expected only SELECT for a single select_priv=Y field, got: $PRIVS"

NO_PRIVS="$(native_conf_privilege_list "accesshosts=localhost&plugin=mysql_native_password")"
[ "$NO_PRIVS" = "ALL" ] || fail "expected ALL when no *_priv=Y flags are present, got: $NO_PRIVS"

# parse_native_db_conf against the real example file
parse_native_db_conf "$CONF_FILE" || fail "parse_native_db_conf should succeed on a valid conf file"

[ "$NATIVE_DB_CHARSET" = "utf8mb3" ] || fail "expected charset utf8mb3, got: $NATIVE_DB_CHARSET"
[ "$NATIVE_DB_COLLATION" = "utf8mb3_general_ci" ] || fail "expected collation utf8mb3_general_ci, got: $NATIVE_DB_COLLATION"
[ "${#NATIVE_DB_USER_NAMES[@]}" -eq 1 ] || fail "expected exactly 1 user, got: ${#NATIVE_DB_USER_NAMES[@]}"
[ "${NATIVE_DB_USER_NAMES[0]}" = "psy_it301" ] || fail "expected username psy_it301, got: ${NATIVE_DB_USER_NAMES[0]}"
[ "${NATIVE_DB_USER_HOST[0]}" = "localhost" ] || fail "expected host localhost, got: ${NATIVE_DB_USER_HOST[0]}"
[ "${NATIVE_DB_USER_HASH[0]}" = "*8E2A6497279CF1B7F115E213B9904BD32703F4EF" ] || fail "password hash not decoded correctly, got: ${NATIVE_DB_USER_HASH[0]}"
[ "${NATIVE_DB_USER_PLUGIN[0]}" = "mysql_native_password" ] || fail "expected mysql_native_password plugin, got: ${NATIVE_DB_USER_PLUGIN[0]}"
echo "${NATIVE_DB_USER_PRIVS[0]}" | grep -q "SELECT" || fail "expected SELECT in privilege list, got: ${NATIVE_DB_USER_PRIVS[0]}"

# --- A conf file with two users on the same database ---
MULTI_CONF="$TMP_DIR/multi.conf"
cat > "$MULTI_CONF" <<'EOF'
accesshosts=0=localhost
db_collation=DEFAULT_CHARACTER_SET_NAME=utf8mb4&DEFAULT_COLLATION_NAME=utf8mb4_general_ci&SCHEMA_NAME=demo_multi
demo_owner=accesshosts=localhost&select_priv=Y&insert_priv=Y&passwd=%2Aaaa&plugin=mysql_native_password
demo_reader=accesshosts=localhost&select_priv=Y&passwd=%2Abbb&plugin=mysql_native_password
EOF

parse_native_db_conf "$MULTI_CONF" || fail "parse_native_db_conf should succeed on a multi-user conf file"
[ "${#NATIVE_DB_USER_NAMES[@]}" -eq 2 ] || fail "expected 2 users in a multi-user conf, got: ${#NATIVE_DB_USER_NAMES[@]}"

# --- A malformed conf file (no db_collation) must fail closed, not guess ---
BAD_CONF="$TMP_DIR/bad.conf"
cat > "$BAD_CONF" <<'EOF'
accesshosts=0=localhost
demo_user=select_priv=Y&passwd=%2Aaaa&plugin=mysql_native_password
EOF

if parse_native_db_conf "$BAD_CONF" 2>/dev/null; then
  fail "parse_native_db_conf must fail when db_collation is missing, not guess a default"
fi

echo "alt_mysql_native_backup_restore_parse_test: OK"