# 1단계: OTEL Java 에이전트 다운로드
FROM alpine:3.20 AS otel
ARG OTEL_VERSION=2.21.0

RUN apk add --no-cache curl && \
    curl -fL \
      https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/download/v${OTEL_VERSION}/opentelemetry-javaagent.jar \
      -o /opentelemetry-javaagent.jar

# 2단계: Tomcat 이미지 (Java 8 기준)
FROM tomcat:9.0-jdk8-temurin

ENV TZ=Asia/Seoul \
    OTEL_SERVICE_NAME=helpdesk_service \
    OTEL_EXPORTER_OTLP_ENDPOINT=http://192.168.100.203:4317 \
    OTEL_EXPORTER_OTLP_PROTOCOL=grpc \
    OTEL_RESOURCE_ATTRIBUTES="deployment.environment=prod" \
    JAVA_TOOL_OPTIONS="\
-Xms1g \
-Xmx1g \
-XX:+UseG1GC \
-XX:MaxGCPauseMillis=200 \
-XX:+UnlockExperimentalVMOptions \
-XX:+UseStringDeduplication \
-XX:+HeapDumpOnOutOfMemoryError \
-XX:HeapDumpPath=/tmp \
-XX:+DisableExplicitGC \
-javaagent:/opt/opentelemetry-javaagent.jar"

# 타임존 설정
RUN ln -sf /usr/share/zoneinfo/Asia/Seoul /etc/localtime

# OTEL 에이전트 복사
COPY --from=otel /opentelemetry-javaagent.jar /opt/opentelemetry-javaagent.jar
RUN chown 1000:1000 /opt/opentelemetry-javaagent.jar

# 기본 웹앱 정리
RUN rm -rf /usr/local/tomcat/webapps/*

# Maven 빌드된 WAR 복사
COPY target/sayit-helpdesk.war /usr/local/tomcat/webapps/ROOT.war
RUN chown -R 1000:1000 /usr/local/tomcat/

EXPOSE 8080
CMD ["catalina.sh","run"]