"""Centralized logging configuration for Maya Global Backend."""

import os
import sys
import json
import logging
import warnings
import traceback
from datetime import timezone
from loguru import logger

from app.config import LOG_DIR, LOG_FILE, DEFAULT_HOST, DEFAULT_PORT


LOG_ROTATION_SIZE = "100 MB"
LOG_RETENTION = "10 days"


def log_filter(record):
    msg = record["message"]

    if "Unable to send message" in msg and "before joining" in msg:
        return False

    if record.get("exception"):
        exc_info = record["exception"]
        if exc_info and exc_info.value:
            exc_msg = str(exc_info.value)
            if "Unable to send message" in exc_msg and "before joining" in exc_msg:
                return False

    # Daily SDK noise
    if "Failed to send LogLine" in msg:
        return False
    if "ResponseCanceled" in msg or "ResponseCancelled" in msg:
        return False
    if "Metrics failed to get snapshot" in msg:
        return False
    if "daily_core" in msg:
        return False
    if "CallManagerEvent" in msg:
        return False
    if "MediasoupManager" in msg:
        return False

    if record["level"].name in ("ERROR", "CRITICAL", "EXCEPTION"):
        return True

    name = record.get("name", "")
    if name and name.startswith(("botocore", "boto3", "urllib3", "s3transfer")):
        return False
    if name and name.startswith("openai"):
        return False
    if name and name.startswith("httpx"):
        return False

    if "Empty audio frame received for STT service" in msg:
        return False
    if "Ignoring not RTVI message" in msg:
        return False
    if "User stopped speaking but no new aggregation received" in msg:
        return False
    if "Unclosed client session" in msg or "Unclosed connector" in msg:
        return False
    if "Task was destroyed but it is pending" in msg:
        return False
    if "Loading JSON file:" in msg:
        return False
    if "Changing event name" in msg:
        return False
    if "Request options:" in msg:
        return False
    return True


CONSOLE_FORMAT = "{time:YYYY-MM-DD HH:mm:ss.SSS} | {level: <8} | {name}:{function}:{line} | {message}"


def datadog_sink(message):
    record = message.record
    level = record["level"].name

    timestamp = record["time"].astimezone(timezone.utc).strftime("%Y-%m-%dT%H:%M:%S.%f")[:-3] + "Z"

    log_entry = {
        "timestamp": timestamp,
        "level": level,
        "logger": record["name"],
        "function": record["function"],
        "line": record["line"],
        "message": record["message"],
        "service": "maya-global-backend",
        "env": os.getenv("DD_ENV", os.getenv("ENVIRONMENT", "development")),
        "version": os.getenv("DD_VERSION", "1.0.0"),
    }

    for key, value in record["extra"].items():
        if value and key not in ("_maya_configured",):
            log_entry[key] = value

    if level in ("ERROR", "CRITICAL", "EXCEPTION"):
        log_entry["status"] = "error"
        log_entry["error.kind"] = level

        if record.get("exception"):
            exc_info = record["exception"]
            if exc_info:
                log_entry["error.type"] = exc_info.type.__name__ if exc_info.type else "Unknown"
                log_entry["error.message"] = str(exc_info.value) if exc_info.value else ""
                log_entry["error.stack"] = "".join(traceback.format_exception(exc_info.type, exc_info.value, exc_info.traceback))
    else:
        log_entry["status"] = "info"

    return json.dumps(log_entry, ensure_ascii=False) + "\n"


class DatadogStdoutSink:
    """Writes JSON-formatted logs to stdout for DD DaemonSet collection."""

    def write(self, message):
        json_line = datadog_sink(message)
        sys.stdout.write(json_line)
        sys.stdout.flush()


class InterceptHandler(logging.Handler):
    def emit(self, record):
        try:
            level = logger.level(record.levelname).name
        except ValueError:
            level = record.levelno

        frame, depth = sys._getframe(6), 6
        while frame and frame.f_code.co_filename == logging.__file__:
            frame = frame.f_back
            depth += 1

        logger.opt(depth=depth, exception=record.exc_info).log(level, record.getMessage())


def configure_logging():
    if hasattr(logger, '_maya_configured'):
        return

    os.makedirs(LOG_DIR, exist_ok=True)
    # Truncate log file on startup
    open(LOG_FILE, "w").close()
    logger.remove()

    is_production = bool(os.getenv("DD_AGENT_HOST"))
    stdout_level = os.getenv("LOG_LEVEL", "INFO")

    if is_production:
        json_stdout_sink = DatadogStdoutSink()
        logger.add(
            json_stdout_sink.write,
            level=stdout_level,
            filter=log_filter,
        )
    else:
        logger.add(
            sys.stdout,
            level=stdout_level,
            format=CONSOLE_FORMAT,
            filter=log_filter,
            colorize=False,
            enqueue=False,
            backtrace=True,
            diagnose=True,
        )

    logger.add(
        LOG_FILE,
        level="INFO",
        format=CONSOLE_FORMAT,
        filter=log_filter,
        rotation=LOG_ROTATION_SIZE,
        retention=LOG_RETENTION,
        compression="zip",
        enqueue=False,
        backtrace=True,
        diagnose=True,
    )

    warnings.filterwarnings("default")
    logging.captureWarnings(True)

    logging.basicConfig(handlers=[InterceptHandler()], level=logging.INFO, force=True)

    for logger_name in ["uvicorn", "uvicorn.error", "uvicorn.access", "fastapi", "pipecat", "aiohttp"]:
        logging.getLogger(logger_name).handlers = [InterceptHandler()]
        logging.getLogger(logger_name).propagate = False

    logger._maya_configured = True

    logger.info("=" * 60)
    logger.info("MAYA GLOBAL BACKEND - STARTUP INITIATED")
    logger.info("=" * 60)
    logger.info(f"STARTUP_CONFIG: env={os.getenv('ENVIRONMENT', 'development')} host={DEFAULT_HOST} port={DEFAULT_PORT}")


def log_startup_complete(startup_time_ms: float = None):
    logger.info("=" * 60)
    logger.info("MAYA GLOBAL BACKEND - STARTUP COMPLETE")
    if startup_time_ms:
        logger.info(f"STARTUP_TIME: {startup_time_ms:.2f}ms")
    logger.info("=" * 60)


def log_shutdown():
    logger.info("MAYA GLOBAL BACKEND - SHUTDOWN INITIATED")


def log_error(message: str, error: Exception = None, **context):
    full_message = f"ERROR: {message}"
    if error:
        full_message += f" | error_type={type(error).__name__} error_message={str(error)}"

    for key, value in context.items():
        full_message += f" {key}={value}"

    if error:
        logger.opt(exception=error).error(full_message)
    else:
        logger.error(full_message)