#!/usr/bin/env bash
## entrypoint-lsphp.sh — PID 1 for cac-lsphp:phpNN.
##
## The per-site PHP backend for the SHARED OpenLiteSpeed tier. Runs lsphp in
## DETACHED LSAPI mode (`lsphp -b <addr:port>`) and nothing else — no
## webserver. The shared-ols container connects to this over the docker
## network (extProcessor type lsapi, address <this-container>:9000) exactly
## like the shared httpd connects to a cac-fpm container's php-fpm on :9000.
##
## Structurally identical to cac-fpm/cac-litespeed: same `uid`/`user` contract,
## the customer docroot mounted at /home/$user (so PHP sees /home/$user/public_html
## EXACTLY like the standalone tiers — true 1:1 drop-in for WordPress ABSPATH,
## config paths, and DB-stored absolute paths). The only difference is OLS lives
## in a separate container, so this PID 1 is lsphp itself.
##
## THE SYMLINK (see feedback_ols_lsapi_no_script_filename_remap): OLS has no
## ProxyFCGISetEnvIf-style remap — it hands lsphp exactly its vhost docRoot path.
## The shared-ols container serves from its bulk /docker/users->/mnt/users mount,
## so its docRoot (and the SCRIPT_FILENAME it sends us) is
## /mnt/users/<user>/<domain>/public_html. We create a symlink
## /mnt/users/<user>/<domain> -> /home/$user so that path resolves to the real
## /home/$user/public_html files. PHP canonicalises the symlink, so
## __FILE__/__DIR__/realpath all report /home/$user/public_html (verified
## 2026-06-10) — the customer never sees the /mnt/users path.

set -euo pipefail

: "${PHPVER:=83}"
: "${environment:=PROD}"
export CONTAINER_ROLE="lsphp_only"
export PHPVER environment

## ---- env validation (same contract as entrypoint-fpm / entrypoint-litespeed) ----
if [ -z "${uid:-}" ] || [ -z "${user:-}" ]; then
  echo "FATAL: 'uid' and 'user' env vars are required (panel sets these from WHP_UID/WHP_USER)." >&2
  exit 1
fi
: "${domain:=localhost}"
export user domain

LSPHP_BIN="/usr/local/lsws/lsphp${PHPVER}/bin/lsphp"
if [ ! -x "$LSPHP_BIN" ]; then
  echo "FATAL: lsphp binary not found at $LSPHP_BIN (PHPVER=$PHPVER)." >&2
  exit 1
fi

## ---- user + directories (identical to entrypoint-litespeed.sh: docroot at
## /home/$user, the customer's bind-mounted domain dir) ----
if ! id -u "$user" >/dev/null 2>&1; then
  useradd -u "$uid" -m -s /bin/bash "$user"
fi
mkdir -p "/home/$user/public_html" "/home/$user/logs/php-fpm"

## ---- compatibility symlink for the OLS-sent path ----
## OLS sends SCRIPT_FILENAME under /mnt/users/<user>/<safe-domain>/public_html
## (the shared-ols container's view). Point that at our real /home/$user mount so
## the path resolves. <safe-domain> matches the on-disk convention: wildcard
## `*.foo.com` is stored as `wildcard.foo.com`.
SAFE_DOMAIN="$domain"
case "$domain" in
  \*.*) SAFE_DOMAIN="wildcard.${domain#\*.}" ;;
esac
mkdir -p "/mnt/users/$user"
ln -sfn "/home/$user" "/mnt/users/$user/$SAFE_DOMAIN"

## ---- detached-lsphp pool sizing ----
# shellcheck source=/dev/null
source /scripts/detect-memory-lsphp.sh

## LSAPI tuning (spec §5.1). PHP_LSAPI_CHILDREN MUST equal the shared-ols vhost
## maxConns — the WHP panel writes both from the single fpm_max_children value,
## so they can't drift. LSAPI_MAX_IDLE is THE RAM win: idle children exit, so an
## idle site's footprint collapses toward baseline (ondemand-like).
export PHP_LSAPI_CHILDREN="${PHP_LSAPI_CHILDREN:-$LSAPI_CHILDREN}"
export PHP_LSAPI_MAX_REQUESTS="${PHP_LSAPI_MAX_REQUESTS:-500}"
export LSAPI_MAX_IDLE="${LSAPI_MAX_IDLE:-30}"
export LSAPI_EXTRA_CHILDREN="${LSAPI_EXTRA_CHILDREN:-5}"
export LSAPI_AVOID_FORK="${LSAPI_AVOID_FORK:-0}"
LSPHP_BIND="${LSPHP_BIND:-0.0.0.0:9000}"

echo "Container memory: ${CONTAINER_MEMORY_MB}MB | PHP_LSAPI_CHILDREN=${PHP_LSAPI_CHILDREN} | LSAPI_MAX_IDLE=${LSAPI_MAX_IDLE} | PHPVER=${PHPVER} | bind=${LSPHP_BIND}"

## ---- per-site ini drop-ins (identical mechanism to entrypoint-litespeed.sh) ----
## error_log → the same customer-visible path cac:phpNN / cac-litespeed use, so
## "where's my PHP error log?" is answered identically across all site types.
SCAN_DIR=$("$LSPHP_BIN" -i 2>/dev/null | awk -F'=> ' '/^Scan this dir/ {print $2; exit}')
if [ -n "$SCAN_DIR" ]; then
  mkdir -p "$SCAN_DIR"
  cat > "$SCAN_DIR/99-user-error-log.ini" <<EOF
; rendered at container start by entrypoint-lsphp.sh
error_log = /home/${user}/logs/php-fpm/error.log
log_errors = On
EOF
  ## Per-site opcache override (panel: Advanced Tuning → OpCache size); falls
  ## back to the baked lsphp-overrides.ini defaults when unset.
  if [ -n "${OPCACHE_MEMORY_MB:-}" ] || [ -n "${OPCACHE_MAX_FILES:-}" ]; then
    {
      echo "; rendered at container start by entrypoint-lsphp.sh"
      echo "; per-site override from WHP whp.sites.opcache_*_override"
      [ -n "${OPCACHE_MEMORY_MB:-}" ] && echo "opcache.memory_consumption = ${OPCACHE_MEMORY_MB}"
      [ -n "${OPCACHE_MAX_FILES:-}" ]  && echo "opcache.max_accelerated_files = ${OPCACHE_MAX_FILES}"
    } > "$SCAN_DIR/99-user-opcache.ini"
  fi
fi

## ---- ownership ----
## Ensure the dirs we created + the log file are customer-owned so lsphp (running
## as $user) can read code and write logs. Customer content is already
## customer-owned from the host side, so we don't recurse the whole (potentially
## large) tree on every boot.
touch "/home/$user/logs/php-fpm/error.log"
chown "$uid:$uid" "/home/$user" "/home/$user/public_html" "/home/$user/logs" "/home/$user/logs/php-fpm" "/home/$user/logs/php-fpm/error.log" 2>/dev/null || true

## ---- exec lsphp -b as the customer user (PID 1) ----
## Bind port is unprivileged (9000), so no root port-bind step is needed — start
## directly as $user. Prefer setpriv (util-linux, on the Ubuntu base); fall back
## to runuser. exec so lsphp becomes PID 1 and receives Docker's signals
## directly (clean stop/restart, matches the php-fpm container's lifecycle).
echo "entrypoint-lsphp: exec $LSPHP_BIN -b $LSPHP_BIND as $user (uid=$uid)"
if command -v setpriv >/dev/null 2>&1; then
  exec setpriv --reuid "$uid" --regid "$uid" --init-groups "$LSPHP_BIN" -b "$LSPHP_BIND"
elif command -v runuser >/dev/null 2>&1; then
  exec runuser -u "$user" -- "$LSPHP_BIN" -b "$LSPHP_BIND"
else
  exec sudo -u "$user" -E "$LSPHP_BIN" -b "$LSPHP_BIND"
fi