#!/bin/bash

# LibrePortal Task Processor Systemd Service Setup
# Replaces crontabSetupTaskProcessor with systemd service.
#
# Idempotent: computes the desired unit for the CURRENT docker mode and only
# rewrites + daemon-reloads + restarts when it actually differs from what's on
# disk. So routine re-runs are no-ops (no needless restart that would kill an
# in-flight task), while a rooted<->rootless switch — which changes the env
# block — triggers exactly one rewrite + restart so the processor re-reads the
# new mode. Safe to call from install AND from the docker-type switcher.
installLibrePortalWebUITaskService()
{
  [[ "$CFG_REQUIREMENT_WEBUI_SERVICE" == "true" ]] || return 0

  local service_file="/etc/systemd/system/libreportal.service"
  local task_processor_script="$install_scripts_dir/crontab/task/crontab_task_processor.sh"
  local task_dir="$containers_dir/libreportal/frontend/data/tasks"

  # Point the processor at the task dir (idempotent).
  if [ -f "$task_processor_script" ]; then
    sed -i "s|TASK_DIR=\".*\"|TASK_DIR=\"$task_dir\"|g" "$task_processor_script"
    chmod +x "$task_processor_script"
  else
    isNotice "Task processor script not found"
  fi

  # Rootless docker exposes the daemon at /run/user/<uid>/docker.sock and depends
  # on XDG_RUNTIME_DIR being set. Systemd units don't inherit user bashrc, so
  # without these Environment= lines the processor would fall back to
  # /var/run/docker.sock (which rootless does not create). The rootless daemon
  # runs as the DOCKER INSTALL USER, so its socket lives in THAT user's runtime
  # dir (matches dockerCommandRunInstallUser). Rooted gets no extras — the
  # default /var/run path is already correct.
  local service_env_block=""
  if [[ "$CFG_DOCKER_INSTALL_TYPE" == "rootless" ]]; then
    local docker_install_uid
    docker_install_uid="$(id -u "$CFG_DOCKER_INSTALL_USER")"
    service_env_block="Environment=DOCKER_HOST=unix:///run/user/${docker_install_uid}/docker.sock
Environment=XDG_RUNTIME_DIR=/run/user/${docker_install_uid}"
  fi

  local desired
  desired="$(cat <<EOF
[Unit]
Description=LibrePortal Task Processor
After=network.target
Wants=network.target

[Service]
Type=simple
User=$sudo_user_name
Group=$sudo_user_name
WorkingDirectory=$install_scripts_dir
ExecStart=$task_processor_script start_script
Restart=always
RestartSec=5
SyslogIdentifier=libreportal
${service_env_block}

# Security
PrivateTmp=true

[Install]
WantedBy=multi-user.target
EOF
)"

  local current=""
  [[ -f "$service_file" ]] && current="$(sudo cat "$service_file" 2>/dev/null)"

  if [[ "$desired" != "$current" ]]; then
    printf '%s\n' "$desired" | runSystem tee "$service_file" > /dev/null
    runSystem systemctl daemon-reload
    runSystem systemctl enable libreportal.service >/dev/null 2>&1
    runSystem systemctl restart libreportal.service
    isSuccessful "LibrePortal task processor service installed/updated ($CFG_DOCKER_INSTALL_TYPE)."
  else
    # Unit already correct — ensure it's enabled + running, without a restart.
    runSystem systemctl enable libreportal.service >/dev/null 2>&1
    sudo systemctl is-active --quiet libreportal.service || runSystem systemctl start libreportal.service
    isSuccessful "LibrePortal task processor service already up to date."
  fi

  # Drop the legacy crontab entry if present (superseded by the service).
  if sudo -u "$sudo_user_name" crontab -l 2>/dev/null | grep -q "task_processor.sh"; then
    sudo -u "$sudo_user_name" crontab -l 2>/dev/null | grep -v "task_processor.sh" | sudo -u "$sudo_user_name" crontab -
    isNotice "Removed task processor from crontab"
  fi
}