import os

os.environ["NUMEXPR_MAX_THREADS"] = "12"

from fastapi import FastAPI, HTTPException, Depends, Body, status, Response
from fastapi.middleware.cors import CORSMiddleware
from fastapi.openapi.models import OAuthFlows as OAuthFlowsModel
from fastapi.security import HTTPBearer
from contextlib import asynccontextmanager


import logging
from logging.handlers import RotatingFileHandler
from datetime import timedelta, datetime
import pathlib

from modules.shared.configuration import APP_CONFIG
from modules.shared.eventManagement import eventManager


class DailyRotatingFileHandler(RotatingFileHandler):
    """
    A rotating file handler that automatically switches to a new file when the date changes.
    The log file name includes the current date and switches at midnight.
    """

    def __init__(
        self, log_dir, filename_prefix, max_bytes=10485760, backup_count=5, **kwargs
    ):
        self.log_dir = log_dir
        self.filename_prefix = filename_prefix
        self.current_date = None
        self.current_file = None

        # Initialize with today's file
        self._update_file_if_needed()

        # Call parent constructor with current file
        super().__init__(
            self.current_file, maxBytes=max_bytes, backupCount=backup_count, **kwargs
        )

    def _update_file_if_needed(self):
        """Update the log file if the date has changed"""
        today = datetime.now().strftime("%Y%m%d")

        if self.current_date != today:
            self.current_date = today
            new_file = os.path.join(self.log_dir, f"{self.filename_prefix}_{today}.log")

            if self.current_file != new_file:
                self.current_file = new_file
                return True
        return False

    def emit(self, record):
        """Emit a log record, switching files if date has changed"""
        # Check if we need to switch to a new file
        if self._update_file_if_needed():
            # Close current file and open new one
            if self.stream:
                self.stream.close()
                self.stream = None

            # Update the baseFilename for the parent class
            self.baseFilename = self.current_file
            # Reopen the stream
            if not self.delay:
                self.stream = self._open()

        # Call parent emit method
        super().emit(record)


def initLogging():
    """Initialize logging with configuration from APP_CONFIG"""
    # Get log level from config (default to INFO if not found)
    logLevelName = APP_CONFIG.get("APP_LOGGING_LOG_LEVEL", "WARNING")
    logLevel = getattr(logging, logLevelName)

    # Get log directory from config
    logDir = APP_CONFIG.get("APP_LOGGING_LOG_DIR", "./")
    if not os.path.isabs(logDir):
        # If relative path, make it relative to the gateway directory
        gatewayDir = os.path.dirname(os.path.abspath(__file__))
        logDir = os.path.join(gatewayDir, logDir)

    # Ensure log directory exists
    os.makedirs(logDir, exist_ok=True)

    # Create formatters - using single line format
    consoleFormatter = logging.Formatter(
        fmt="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
        datefmt=APP_CONFIG.get("APP_LOGGING_DATE_FORMAT", "%Y-%m-%d %H:%M:%S"),
    )

    # File formatter with more detailed error information but still single line
    fileFormatter = logging.Formatter(
        fmt="%(asctime)s - %(levelname)s - %(name)s - %(message)s - %(pathname)s:%(lineno)d - %(funcName)s",
        datefmt=APP_CONFIG.get("APP_LOGGING_DATE_FORMAT", "%Y-%m-%d %H:%M:%S"),
    )

    # Add filter to exclude Chrome DevTools requests
    class ChromeDevToolsFilter(logging.Filter):
        def filter(self, record):
            return not (
                isinstance(record.msg, str)
                and (
                    ".well-known/appspecific/com.chrome.devtools.json" in record.msg
                    or "Request: /index.html" in record.msg
                )
            )

    # Add filter to exclude all httpcore loggers (including sub-loggers)
    class HttpcoreStarFilter(logging.Filter):
        def filter(self, record):
            return not (
                record.name == "httpcore" or record.name.startswith("httpcore.")
            )

    # Add filter to exclude HTTP debug messages
    class HTTPDebugFilter(logging.Filter):
        def filter(self, record):
            if isinstance(record.msg, str):
                # Filter out HTTP debug messages
                http_debug_patterns = [
                    "receive_response_body.started",
                    "receive_response_body.complete",
                    "response_closed.started",
                    "_send_single_request",
                    "httpcore.http11",
                    "httpx._client",
                    "HTTP Request",
                    "multipart.multipart",
                ]
                return not any(pattern in record.msg for pattern in http_debug_patterns)
            return True

    # Add filter to remove emojis from log messages to prevent Unicode encoding errors
    class EmojiFilter(logging.Filter):
        def filter(self, record):
            if isinstance(record.msg, str):
                # Remove only emojis, preserve other Unicode characters like quotes
                import re
                import unicodedata

                # Remove emoji characters specifically
                record.msg = "".join(
                    char
                    for char in record.msg
                    if unicodedata.category(char) != "So"
                    or not (
                        0x1F600 <= ord(char) <= 0x1F64F
                        or 0x1F300 <= ord(char) <= 0x1F5FF
                        or 0x1F680 <= ord(char) <= 0x1F6FF
                        or 0x1F1E0 <= ord(char) <= 0x1F1FF
                        or 0x2600 <= ord(char) <= 0x26FF
                        or 0x2700 <= ord(char) <= 0x27BF
                    )
                )
            return True

    # Configure handlers based on config
    handlers = []

    # Add console handler if enabled
    if APP_CONFIG.get("APP_LOGGING_CONSOLE_ENABLED", True):
        consoleHandler = logging.StreamHandler()
        consoleHandler.setFormatter(consoleFormatter)
        consoleHandler.addFilter(ChromeDevToolsFilter())
        consoleHandler.addFilter(HttpcoreStarFilter())
        consoleHandler.addFilter(HTTPDebugFilter())
        consoleHandler.addFilter(EmojiFilter())
        handlers.append(consoleHandler)

    # Add file handler if enabled
    if APP_CONFIG.get("APP_LOGGING_FILE_ENABLED", True):
        # Create daily application log file with automatic date switching
        rotationSize = int(
            APP_CONFIG.get("APP_LOGGING_ROTATION_SIZE", 10485760)
        )  # Default: 10MB
        backupCount = int(APP_CONFIG.get("APP_LOGGING_BACKUP_COUNT", 5))

        fileHandler = DailyRotatingFileHandler(
            log_dir=logDir,
            filename_prefix="log_app",
            max_bytes=rotationSize,
            backup_count=backupCount,
        )
        fileHandler.setFormatter(fileFormatter)
        fileHandler.addFilter(ChromeDevToolsFilter())
        fileHandler.addFilter(HttpcoreStarFilter())
        fileHandler.addFilter(HTTPDebugFilter())
        fileHandler.addFilter(EmojiFilter())
        handlers.append(fileHandler)

    # Configure the root logger
    logging.basicConfig(
        level=logLevel,
        format="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
        datefmt=APP_CONFIG.get("APP_LOGGING_DATE_FORMAT", "%Y-%m-%d %H:%M:%S"),
        handlers=handlers,
        force=True,  # Force reconfiguration of the root logger
    )

    # Silence noisy third-party libraries - use the same level as the root logger
    noisyLoggers = [
        "httpx",
        "httpcore",
        "urllib3",
        "asyncio",
        "fastapi.security.oauth2",
        "msal",
    ]
    for loggerName in noisyLoggers:
        logging.getLogger(loggerName).setLevel(logging.WARNING)

    # Log the current logging configuration
    logger = logging.getLogger(__name__)
    logger.info(f"Logging initialized with level {logLevelName}")
    logger.info(f"Log directory: {logDir}")

    if APP_CONFIG.get("APP_LOGGING_FILE_ENABLED", True):
        today = datetime.now().strftime("%Y%m%d")
        appLogFile = os.path.join(logDir, f"log_app_{today}.log")
        logger.info(f"Application log file: {appLogFile} (auto-switches daily)")
    else:
        logger.info("Application log file: disabled")

    logger.info(
        f"Console logging: {'enabled' if APP_CONFIG.get('APP_LOGGING_CONSOLE_ENABLED', True) else 'disabled'}"
    )


# Initialize logging
initLogging()
logger = logging.getLogger(__name__)
instanceLabel = APP_CONFIG.get("APP_ENV_LABEL")


# Define lifespan context manager for application startup/shutdown events
@asynccontextmanager
async def lifespan(app: FastAPI):
    logger.info("Application is starting up")

    # Initialize LangGraph checkpointer
    from modules.features.chatBot.utils.checkpointer import (
        initialize_checkpointer,
        close_checkpointer,
    )

    try:
        await initialize_checkpointer()
        logger.info("LangGraph checkpointer initialized successfully")
    except Exception as e:
        logger.error(f"Failed to initialize LangGraph checkpointer: {str(e)}")
        # Continue startup even if checkpointer fails to initialize

    eventManager.start()
    yield

    # Cleanup
    eventManager.stop()
    await close_checkpointer()
    logger.info("Application has been shut down")


# START APP
app = FastAPI(
    title="PowerOn | Data Platform API",
    description=f"Backend API for the Multi-Agent Platform by ValueOn AG ({instanceLabel})",
    lifespan=lifespan,
    swagger_ui_init_oauth={
        "usePkceWithAuthorizationCodeGrant": True,
    },
)

# Configure OpenAPI security scheme for Swagger UI
# This adds the "Authorize" button to the /docs page
security_scheme = HTTPBearer()
app.openapi_schema = None  # Reset schema to regenerate with security


def custom_openapi():
    if app.openapi_schema:
        return app.openapi_schema

    from fastapi.openapi.utils import get_openapi

    openapi_schema = get_openapi(
        title=app.title,
        version="1.0.0",
        description=app.description,
        routes=app.routes,
    )

    # Add security scheme definition
    openapi_schema["components"]["securitySchemes"] = {
        "BearerAuth": {
            "type": "http",
            "scheme": "bearer",
            "bearerFormat": "JWT",
            "description": "Enter your JWT token (obtained from login endpoint or browser cookies)",
        }
    }

    # Apply security globally to all endpoints
    # Individual endpoints can override this if needed
    openapi_schema["security"] = [{"BearerAuth": []}]

    app.openapi_schema = openapi_schema
    return app.openapi_schema


app.openapi = custom_openapi


# Parse CORS origins from environment variable
def get_allowed_origins():
    origins_str = APP_CONFIG.get("APP_ALLOWED_ORIGINS", "http://localhost:8080")
    # Split by comma and strip whitespace
    origins = [origin.strip() for origin in origins_str.split(",")]
    logger.info(f"CORS allowed origins: {origins}")
    return origins


# CORS configuration using environment variables
app.add_middleware(
    CORSMiddleware,
    allow_origins=get_allowed_origins(),
    allow_credentials=True,
    allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
    allow_headers=["*"],
    expose_headers=["*"],
    max_age=86400,  # Increased caching for preflight requests
)

# CSRF protection middleware
from modules.security.csrf import CSRFMiddleware
from modules.security.tokenRefreshMiddleware import (
    TokenRefreshMiddleware,
    ProactiveTokenRefreshMiddleware,
)

app.add_middleware(CSRFMiddleware)

# Token refresh middleware (silent refresh for expired OAuth tokens)
app.add_middleware(TokenRefreshMiddleware, enabled=True)

# Proactive token refresh middleware (refresh tokens before they expire)
app.add_middleware(
    ProactiveTokenRefreshMiddleware, enabled=True, check_interval_minutes=5
)

# Run triggered features
import modules.features.init

# Include all routers
from modules.routes.routeAdmin import router as generalRouter

app.include_router(generalRouter)

from modules.routes.routeAttributes import router as attributesRouter

app.include_router(attributesRouter)

from modules.routes.routeDataMandates import router as mandateRouter

app.include_router(mandateRouter)

from modules.routes.routeDataUsers import router as userRouter

app.include_router(userRouter)

from modules.routes.routeDataFiles import router as fileRouter

app.include_router(fileRouter)

from modules.routes.routeDataNeutralization import router as neutralizationRouter

app.include_router(neutralizationRouter)

from modules.routes.routeDataPrompts import router as promptRouter

app.include_router(promptRouter)

from modules.routes.routeDataConnections import router as connectionsRouter

app.include_router(connectionsRouter)

from modules.routes.routeWorkflows import router as workflowRouter

app.include_router(workflowRouter)

from modules.routes.routeChatPlayground import router as chatPlaygroundRouter

app.include_router(chatPlaygroundRouter)

from modules.routes.routeSecurityLocal import router as localRouter

app.include_router(localRouter)

from modules.routes.routeSecurityMsft import router as msftRouter

app.include_router(msftRouter)

from modules.routes.routeSecurityGoogle import router as googleRouter

app.include_router(googleRouter)

from modules.routes.routeVoiceGoogle import router as voiceGoogleRouter

app.include_router(voiceGoogleRouter)

from modules.routes.routeSecurityAdmin import router as adminSecurityRouter

app.include_router(adminSecurityRouter)

from modules.routes.routeChatbot import router as chatbotRouter

app.include_router(chatbotRouter)