#!/bin/bash
set -euo pipefail

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

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

# Source only the detection functions, without triggering main() (main() is
# added in Task 4, guarded behind a BASH_SOURCE check).
NATIVE_TAKEOVER_LOG="$TMP_DIR/takeover.log" \
  source "$SCRIPT"

# --- check_os_guard: AlmaLinux 9 must pass ---
cat > "$TMP_DIR/os-release-alma9" <<'EOF'
ID="almalinux"
VERSION_ID="9.4"
PRETTY_NAME="AlmaLinux 9.4"
EOF
OS_RELEASE_FILE="$TMP_DIR/os-release-alma9" check_os_guard \
  || fail "AlmaLinux 9 should pass the OS guard"

# --- check_os_guard: AlmaLinux 8 must pass ---
cat > "$TMP_DIR/os-release-alma8" <<'EOF'
ID="almalinux"
VERSION_ID="8.10"
EOF
OS_RELEASE_FILE="$TMP_DIR/os-release-alma8" check_os_guard \
  || fail "AlmaLinux 8 should pass the OS guard"

# --- check_os_guard: CloudLinux must be refused ---
cat > "$TMP_DIR/os-release-cloudlinux" <<'EOF'
ID="cloudlinux"
VERSION_ID="8.9"
ID_LIKE="rhel fedora centos"
EOF
if ( OS_RELEASE_FILE="$TMP_DIR/os-release-cloudlinux" check_os_guard 2>/dev/null ); then
  fail "CloudLinux must be refused by the OS guard"
fi

# --- check_os_guard: AlmaLinux 7 (out of supported range) must be refused ---
cat > "$TMP_DIR/os-release-alma7" <<'EOF'
ID="almalinux"
VERSION_ID="7.9"
EOF
if ( OS_RELEASE_FILE="$TMP_DIR/os-release-alma7" check_os_guard 2>/dev/null ); then
  fail "AlmaLinux 7 must be refused by the OS guard (only 8/9 supported)"
fi

# --- read_native_mysql_conf + already_migrated ---
cat > "$TMP_DIR/mysql.conf.3306" <<'EOF'
user=da_admin
passwd=secret
port=3306
socket=/var/lib/mysql/mysql.sock
host=
EOF
NATIVE_MYSQL_CONF="$TMP_DIR/mysql.conf.3306" read_native_mysql_conf \
  || fail "read_native_mysql_conf should succeed on a valid mysql.conf"
[ "$NATIVE_CURRENT_USER" = "da_admin" ] || fail "expected user da_admin, got: $NATIVE_CURRENT_USER"
[ "$NATIVE_CURRENT_PORT" = "3306" ] || fail "expected port 3306, got: $NATIVE_CURRENT_PORT"
already_migrated && fail "already_migrated should be false when native port is still 3306"

cat > "$TMP_DIR/mysql.conf.3307" <<'EOF'
user=da_admin
passwd=secret
port=3307
socket=/var/lib/mysql/mysql.sock
host=
EOF
NATIVE_MYSQL_CONF="$TMP_DIR/mysql.conf.3307" read_native_mysql_conf \
  || fail "read_native_mysql_conf should succeed on an already-migrated mysql.conf"
already_migrated || fail "already_migrated should be true when native port is 3307"

# --- read_current_mysql_inst ---
cat > "$TMP_DIR/options.conf" <<'EOF'
mysql_inst=mariadb
mariadb=10.6
EOF
CUSTOMBUILD_OPTIONS_CONF="$TMP_DIR/options.conf" read_current_mysql_inst \
  || fail "read_current_mysql_inst should succeed"
[ "$NATIVE_CURRENT_MYSQL_INST" = "mariadb" ] || fail "expected mysql_inst=mariadb, got: $NATIVE_CURRENT_MYSQL_INST"

# --- preflight_new_port_free using a faked `ss` on PATH ---
mkdir -p "$TMP_DIR/bin"
cat > "$TMP_DIR/bin/ss" <<'STUB'
#!/bin/bash
# Pretends port 3307 is free and port 9999 is occupied.
for arg in "$@"; do
  case "$arg" in
    *:3307*) exit 0 ;;
    *:9999*)
      echo "header line"
      echo "occupied line"
      exit 0
      ;;
  esac
done
exit 0
STUB
chmod 755 "$TMP_DIR/bin/ss"

PATH="$TMP_DIR/bin:$PATH" NEW_NATIVE_PORT="3307" preflight_new_port_free \
  || fail "preflight_new_port_free should pass when the target port is free"

if ( PATH="$TMP_DIR/bin:$PATH" NEW_NATIVE_PORT="9999" preflight_new_port_free 2>/dev/null ); then
  fail "preflight_new_port_free should refuse when the target port is already occupied"
fi

echo "native_mariadb_port_takeover_detect_test: OK"