"""
WSGI config for blog_prj project.

It exposes the WSGI callable as a module-level variable named ``application``.

For more information on this file, see
https://docs.djangoproject.com/en/4.2/howto/deployment/wsgi/
"""

import os

# Django 설정을 미리 불러온다
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'blog_prj.settings')

from django.conf import settings
from django.core.wsgi import get_wsgi_application

# DEBUG 모드 아닐 때만 OpenTelemetry 활성
print(f"[OTEL] DEBUG={settings.DEBUG}, TRACE_ENDPOINT={settings.TRACE_ENDPOINT}")
if not settings.DEBUG:
    import grpc
    from opentelemetry import trace
    from opentelemetry.sdk.resources import Resource
    from opentelemetry.sdk.trace import TracerProvider
    from opentelemetry.sdk.trace.export import BatchSpanProcessor
    from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import OTLPSpanExporter
    from opentelemetry.instrumentation.django import DjangoInstrumentor
    from opentelemetry.instrumentation.requests import RequestsInstrumentor
    from opentelemetry.instrumentation.logging import LoggingInstrumentor
    from opentelemetry.instrumentation.dbapi import trace_integration
    import MySQLdb

    trace.set_tracer_provider(
        TracerProvider(
            resource=Resource.create({
                "service.platform": settings.SERVICE_PLATFORM,
                "service.name": settings.TRACE_SERVICE_NAME,
            })
        )
    )

    # TRACE_CA_CERT 설정에 따른 gRPC credentials 구성
    credentials = None
    ca_cert_path = os.getenv('TRACE_CA_CERT', '').strip()
    print(f"[OTEL] CA_CERT_PATH={ca_cert_path}, exists={os.path.exists(ca_cert_path) if ca_cert_path else False}")
    if ca_cert_path and os.path.exists(ca_cert_path):
        with open(ca_cert_path, 'rb') as f:
            ca_cert = f.read()
        credentials = grpc.ssl_channel_credentials(root_certificates=ca_cert)
        insecure = False
        print(f"[OTEL] Using TLS with CA cert")
    else:
        insecure = True
        print(f"[OTEL] Using insecure mode")

    otlp_exporter = OTLPSpanExporter(
        endpoint=settings.TRACE_ENDPOINT,
        insecure=insecure,
        credentials=credentials,
        headers={
            "x-scope-orgid": settings.SERVICE_PLATFORM,
            "x-service": settings.TRACE_SERVICE_NAME
        }
    )

    trace.get_tracer_provider().add_span_processor(
        BatchSpanProcessor(otlp_exporter)
    )
    print(f"[OTEL] OpenTelemetry initialized: service={settings.TRACE_SERVICE_NAME}, endpoint={settings.TRACE_ENDPOINT}")

    # Django 요청/응답 추적
    DjangoInstrumentor().instrument()

    # HTTP 클라이언트 요청 추적 (requests 라이브러리)
    RequestsInstrumentor().instrument()

    # 로그와 Trace 연동 (trace_id, span_id를 로그에 자동 추가)
    LoggingInstrumentor().instrument(set_logging_format=True)

    # MySQL DB 쿼리 추적
    trace_integration(
        MySQLdb,
        "connect",
        "mysql",
        capture_parameters=True,
    )


application = get_wsgi_application()