"""采集进度存储"""
import sqlite3
import os
import logging
from datetime import datetime
from typing import Optional
from contextlib import contextmanager
from app.models import CrawlProgress
from app.core.config import settings

logger = logging.getLogger(__name__)


class ProgressStore:
    """采集进度存储（SQLite）"""
    
    def __init__(self, db_path: str = None):
        self.db_path = db_path or settings.database.path
        os.makedirs(os.path.dirname(self.db_path) or ".", exist_ok=True)
        self._init_db()
    
    def _init_db(self):
        """初始化数据库"""
        with self._get_conn() as conn:
            conn.execute("""
                CREATE TABLE IF NOT EXISTS crawl_progress (
                    task_id TEXT PRIMARY KEY,
                    last_start_offset INTEGER,
                    total INTEGER DEFAULT 0,
                    last_update TEXT,
                    status TEXT DEFAULT 'idle',
                    filtered_count INTEGER DEFAULT 0,
                    produced_count INTEGER DEFAULT 0
                )
            """)
            conn.commit()
    
    @contextmanager
    def _get_conn(self):
        """获取数据库连接"""
        conn = sqlite3.connect(self.db_path)
        conn.row_factory = sqlite3.Row
        try:
            yield conn
        finally:
            conn.close()

    def get_progress(self, task_id: str) -> Optional[CrawlProgress]:
        """获取采集进度"""
        with self._get_conn() as conn:
            cursor = conn.execute("SELECT * FROM crawl_progress WHERE task_id = ?", (task_id,))
            row = cursor.fetchone()
            if row:
                return CrawlProgress(
                    task_id=row["task_id"],
                    last_start_offset=row["last_start_offset"],
                    total=row["total"],
                    last_update=row["last_update"] or "",
                    status=row["status"]
                )
            return None
    
    def save_progress(self, task_id: str, last_start_offset: int, total: int, 
                      status: str = "running", filtered_count: int = 0, produced_count: int = 0):
        """保存采集进度"""
        now = datetime.now().isoformat()
        with self._get_conn() as conn:
            conn.execute("""
                INSERT INTO crawl_progress 
                    (task_id, last_start_offset, total, last_update, status, filtered_count, produced_count)
                VALUES (?, ?, ?, ?, ?, ?, ?)
                ON CONFLICT(task_id) DO UPDATE SET
                    last_start_offset = excluded.last_start_offset, total = excluded.total,
                    last_update = excluded.last_update, status = excluded.status,
                    filtered_count = excluded.filtered_count, produced_count = excluded.produced_count
            """, (task_id, last_start_offset, total, now, status, filtered_count, produced_count))
            conn.commit()
    
    def get_stats(self, task_id: str) -> dict:
        """获取统计信息"""
        with self._get_conn() as conn:
            cursor = conn.execute("SELECT * FROM crawl_progress WHERE task_id = ?", (task_id,))
            row = cursor.fetchone()
            if row:
                return dict(row)
            return {}
    
    def reset_progress(self, task_id: str):
        """重置采集进度"""
        with self._get_conn() as conn:
            conn.execute("DELETE FROM crawl_progress WHERE task_id = ?", (task_id,))
            conn.commit()


progress_store = ProgressStore()