from my_modules.app.logger import logger

from datetime import datetime, timedelta, timezone
from zoneinfo import ZoneInfo
from collections import Counter
import asyncio, gel, json

class EdgeDB:
  def __init__(self, database:str=None, tls_security:str='insecure', timeout:int=1, max_retrys:int=10):
    self.database = database
    self.tls_security = tls_security

    self.timeout = timeout
    self.max_retrys = max_retrys

    self.client = None

  # Connect Function
  async def __aenter__(self):
    await self.connect()
    return self

  async def __aexit__(self, exc_type, exc, tb):
    await self.close()

  async def connect(self):
    self.client = gel.create_async_client(
      tls_security=self.tls_security,
      database=self.database,
      timeout=self.timeout
    )

  async def close(self):
    if self.client:
      await self.client.aclose()

  # Query Helper Function
  async def run_query_with_reconnection(self, function, *args:tuple, **kwargs):
    retry_count = 0
    while True:
      try:
        query = args[0].replace('\n     ', '').replace('  ', '')
        if args[1:]:
          await logger.debug(f'{function.__name__} |{query}| {args[1:]}{kwargs}')
        else:
          await logger.debug(f'{function.__name__} |{query}| {kwargs}')

        return await function(*args, **kwargs)
      except gel.errors.ClientConnectionFailedError:
        await self.connect()
        await logger.error(f'Retry to Query Database: {retry_count}, Function: {args}')
        if retry_count > self.max_retrys:
          break
        await asyncio.sleep(0.5)
        retry_count += 1

  # App Quary Functions
  async def get_file(self, file_id:str):
    data = await self.run_query_with_reconnection(
      self.client.query_single,
      """
      select files {
        file_name,
        content_type,
        expires_at
      }
      filter .file_id = <str>$file_id
      limit 1
      """,
      file_id=file_id
    )
    
    if data:
      return {
        "file_name": data.file_name,
        "content_type": data.content_type,
        "expires_at": data.expires_at
      }
    return None

  async def get_files(self, current_datetime, user_id: str):
    data = await self.run_query_with_reconnection(
      self.client.query,
      """
      select files {
        file_id,
        file_name,
        file_size,
        note,
        uploaded_at,
        expires_at
      }
      filter
        .user_id = <str>$user_id
        and (
          (.expires_at ?? <datetime>'9999-12-31T00:00:00Z') > <datetime>$now
        )
      order by .uploaded_at desc
      """,
      now=current_datetime,
      user_id=user_id,
    )
    return [
      {
        "file_id": i.file_id,
        "file_name": i.file_name,
        "file_size": i.file_size,
        "note": i.note,
        "uploaded_at": i.uploaded_at,
        "expires_at": i.expires_at,
      } for i in data
    ]

  async def add_file(self, file_id, file_name, file_size, note, content_type, uploaded_at, expires_at, user_id:str):
    return await self.run_query_with_reconnection(
      self.client.query,
      """
      insert files {
        file_id := <str>$file_id,
        file_name := <str>$file_name,
        file_size := <str>$file_size,
        note := <str>$note,
        content_type := <str>$content_type,
        uploaded_at := <datetime>$uploaded_at,
        expires_at := <optional datetime>$expires_at,
        user_id := <str>$user_id
      };
      """,
      file_id=file_id,
      file_name=file_name,
      file_size=file_size,
      note=note,
      content_type=content_type,
      uploaded_at=uploaded_at,
      expires_at=expires_at,
      user_id=user_id,
    )

  async def update_file(self, file_id:str, file_name:str, note:str, expires_at, user_id:str):
    return await self.run_query_with_reconnection(
      self.client.query,
      """
      update files
      filter .file_id = <str>$file_id and .user_id = <str>$user_id
      set {
        file_name := <str>$file_name,
        note := <str>$note,
        expires_at := <datetime>$expires_at
      };
      """,
      file_id=file_id,
      file_name=file_name,
      note=note,
      expires_at=expires_at,
      user_id=user_id,
    )

  async def delete_file(self, file_id:str, user_id:str):
    await self.run_query_with_reconnection(
      self.client.query,
      """
      delete files
      filter .file_id = <str>$file_id AND .user_id = <str>$user_id
      """,
      file_id=file_id,
      user_id=user_id
    )

  async def get_expired_files(self:str, current_datetime):
    data = await self.run_query_with_reconnection(
      self.client.query,
      """
      select files {
        file_id,
        file_name,
        expires_at
      }
      filter .expires_at < <datetime>$now
      order by .expires_at asc;
      """,
      now=current_datetime
    )
    return [
      {
        "file_id": item.file_id,
        "file_name": item.file_name,
        "expires_at": item.expires_at
      } for item in data
    ]

  async def delete_files_by_ids(self, remove_file_ids:list[str]):
    if not remove_file_ids:
      return

    await self.run_query_with_reconnection(
      self.client.query,
      """
      delete files
      filter .file_id in array_unpack(<array<str>>$ids);
      """,
      ids=remove_file_ids
    )