#!/usr/bin/env bash
set -euo pipefail

if [[ "${EUID}" -ne 0 ]]; then
    echo "Please run as root: sudo ./install.sh" >&2
    exit 1
fi

PACKAGE_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
INSTALL_DIR="${INSTALL_DIR:-/opt/vehicle-video-service}"
SERVICE_USER="${SERVICE_USER:-${SUDO_USER:-aiec}}"
SERVICE_GROUP="${SERVICE_GROUP:-$SERVICE_USER}"
DISABLE_LEGACY_SERVICES="${DISABLE_LEGACY_SERVICES:-1}"

need_file() {
    if [[ ! -e "$1" ]]; then
        echo "Missing required file: $1" >&2
        exit 1
    fi
}

render_service() {
    local template="$1"
    local target="$2"
    sed \
        -e "s#@INSTALL_DIR@#$INSTALL_DIR#g" \
        -e "s#@SERVICE_USER@#$SERVICE_USER#g" \
        -e "s#@SERVICE_GROUP@#$SERVICE_GROUP#g" \
        "$template" > "$target"
}

warn_missing_gst_plugin() {
    local plugin="$1"
    if command -v gst-inspect-1.0 >/dev/null 2>&1; then
        if ! gst-inspect-1.0 "$plugin" >/dev/null 2>&1; then
            echo "Warning: missing GStreamer plugin: $plugin" >&2
        fi
    else
        echo "Warning: gst-inspect-1.0 not found; please install GStreamer runtime." >&2
        return
    fi
}

need_file "$PACKAGE_DIR/bin/vehicle_video_service"
need_file "$PACKAGE_DIR/config/config.json"
need_file "$PACKAGE_DIR/srs/bin/srs"
need_file "$PACKAGE_DIR/srs/conf/live.conf"
need_file "$PACKAGE_DIR/srs/conf/record.conf"

install -d "$INSTALL_DIR/bin" "$INSTALL_DIR/srs/bin" "$INSTALL_DIR/srs/conf" "$INSTALL_DIR/srs/html" \
           "$INSTALL_DIR/srs/log" "$INSTALL_DIR/srs/run" /media/record

install -m 0755 "$PACKAGE_DIR/bin/vehicle_video_service" "$INSTALL_DIR/bin/vehicle_video_service"
install -m 0644 "$PACKAGE_DIR/config/config.json" "$INSTALL_DIR/bin/config.json"
install -m 0755 "$PACKAGE_DIR/srs/bin/srs" "$INSTALL_DIR/srs/bin/srs"
install -m 0644 "$PACKAGE_DIR/srs/conf/live.conf" "$INSTALL_DIR/srs/conf/live.conf"
install -m 0644 "$PACKAGE_DIR/srs/conf/record.conf" "$INSTALL_DIR/srs/conf/record.conf"
cp -a "$PACKAGE_DIR/srs/html"/. "$INSTALL_DIR/srs/html/"

chown -R "$SERVICE_USER:$SERVICE_GROUP" "$INSTALL_DIR" /media/record

if [[ "$DISABLE_LEGACY_SERVICES" == "1" ]]; then
    for service in srs-live.service srs-record.service video_manager.service; do
        if systemctl list-unit-files "$service" >/dev/null 2>&1; then
            systemctl disable --now "$service" >/dev/null 2>&1 || true
        fi
    done
fi

render_service "$PACKAGE_DIR/systemd/vehicle-video-srs-live.service.in" \
    /etc/systemd/system/vehicle-video-srs-live.service
render_service "$PACKAGE_DIR/systemd/vehicle-video-srs-record.service.in" \
    /etc/systemd/system/vehicle-video-srs-record.service
render_service "$PACKAGE_DIR/systemd/vehicle-video-service.service.in" \
    /etc/systemd/system/vehicle-video-service.service

systemctl daemon-reload
systemctl enable --now vehicle-video-srs-live.service vehicle-video-srs-record.service vehicle-video-service.service

warn_missing_gst_plugin v4l2src
warn_missing_gst_plugin mpph264enc
warn_missing_gst_plugin h264parse
warn_missing_gst_plugin flvmux
warn_missing_gst_plugin rtmpsink

echo "Installed to $INSTALL_DIR"
echo "Services: vehicle-video-srs-live, vehicle-video-srs-record, vehicle-video-service"