import asyncio
import logging
import os
from pyrogram import Client, utils

logger = logging.getLogger("pyrogram_clients")

# ====================== 重要修復：Pyrogram PeerIdInvalid Bug ======================
# 針對大型 supergroup/channel ID（如 -10025xxxxxxxx）經常出現的問題
def get_peer_type_new(peer_id: int) -> str:
    """強制正確識別 -100 開頭的 chat_id 為 channel/supergroup"""
    peer_id_str = str(peer_id)
    if not peer_id_str.startswith("-"):
        return "user"
    elif peer_id_str.startswith("-100"):
        return "channel"
    else:
        return "chat"


# 立即套用 patch（必須在任何 Pyrogram 操作前執行）
utils.get_peer_type = get_peer_type_new
logger.info("[PYRO-FIX] Monkey patch applied successfully: get_peer_type fixed for large supergroups/channels")
# ===============================================================================


async def perform_pyrogram_upload(client, file_path, file_name, chat_id, mime_type, size, thumbnail_path=None, task_id=None):
    """
    執行 Pyrogram 上傳（已加入 PeerIdInvalid 修復與進度回調）
    """
    import time
    from database import db
    from models import UploadTask

    start_time = time.time()
    last_update_time = 0

    async def progress_callback(current, total):
        nonlocal last_update_time
        now = time.time()
        # 每秒更新一次數據庫，避免頻繁寫入
        if now - last_update_time >= 1.0 and task_id:
            elapsed = now - start_time
            speed_mb = (current / 1024 / 1024) / elapsed if elapsed > 0 else 0
            speed_str = f"{speed_mb:.2f} MB/s"
            
            # 使用獨立的 session 更新，避免干擾主線程
            try:
                task = UploadTask.query.get(task_id)
                if task:
                    task.uploaded_bytes = current
                    task.speed = speed_str
                    db.session.commit()
                last_update_time = now
            except:
                db.session.rollback()

    try:
        if not os.path.exists(file_path):
            logger.error(f"[PYRO-FLOW] File not found: {file_path}")
            return [None] * 6

        target_chat = int(chat_id) if isinstance(chat_id, str) else chat_id
        logger.info(f"[PYRO-FLOW] Starting upload: {file_name} → chat {target_chat} | mime: {mime_type}")

        # 嘗試預先獲取 chat（更新 access hash），失敗也不中斷
        try:
            chat_obj = await client.get_chat(target_chat)
            logger.info(f"[PYRO-FLOW] get_chat success: {chat_obj.title} (type: {chat_obj.type})")
        except Exception as e:
            logger.warning(f"[PYRO-FLOW] get_chat failed (common with large IDs): {e}. Continuing with upload...")

        message = None

        if mime_type.startswith("video/"):
            message = await client.send_video(
                chat_id=target_chat,
                video=file_path,
                file_name=file_name,
                thumb=thumbnail_path,
                supports_streaming=True,
                progress=progress_callback
            )
        else:
            message = await client.send_document(
                chat_id=target_chat,
                document=file_path,
                file_name=file_name,
                thumb=thumbnail_path,
                progress=progress_callback
            )

        if message:
            # 兼容 video / document / audio 等
            item = getattr(message, 'video', None) or \
                   getattr(message, 'document', None) or \
                   getattr(message, 'audio', None) or \
                   getattr(message, 'photo', None)

            if not item:
                logger.error("[PYRO-FLOW] Upload succeeded but could not extract file details.")
                return [None] * 6

            file_id = item.file_id
            final_thumb_id = None

            if hasattr(item, 'thumbs') and item.thumbs:
                final_thumb_id = item.thumbs[-1].file_id
            elif hasattr(item, 'thumbnail') and item.thumbnail:
                final_thumb_id = item.thumbnail.file_id

            logger.info(f"[PYRO-FLOW] Upload SUCCESS! file_id: {file_id[:25]}... | msg_id: {message.id}")
            return file_id, file_name, mime_type, item.file_size, final_thumb_id, message.id

        else:
            logger.error("[PYRO-FLOW] send_video/send_document returned None")
            return [None] * 6

    except Exception as e:
        logger.error(f"[PYRO-FLOW] Critical error during upload: {type(e).__name__}: {e}")
        # 如果還是出現 PeerIdInvalid，顯示更清楚的提示
        if "Peer id invalid" in str(e) or "PEER_ID_INVALID" in str(e).upper():
            logger.error("[PYRO-FLOW] PeerIdInvalid still occurred. Please check: "
                         "1. Bot is added to the group as admin  "
                         "2. Chat ID is correct  "
                         "3. Try making the group public briefly then private again.")
        return [None] * 6