"""
PostgreSQL User Repository 实现
"""
from typing import Optional
import psycopg2
from psycopg2.extras import RealDictCursor
from datetime import datetime

from packages.domain.entities import User
from packages.ports.user_repository import UserRepository


class PostgresUserRepository(UserRepository):
    """User 仓储 PostgreSQL 实现"""
    
    def __init__(self, connection_string: str):
        self.connection_string = connection_string
    
    def _get_connection(self):
        """获取数据库连接"""
        return psycopg2.connect(self.connection_string, cursor_factory=RealDictCursor)
    
    def save(self, user: User) -> None:
        """保存用户"""
        conn = self._get_connection()
        try:
            with conn.cursor() as cur:
                # Upsert (插入或更新)
                cur.execute("""
                    INSERT INTO users (
                        id, email, display_name, username, password_hash,
                        email_verified, email_verification_token,
                        password_reset_token, password_reset_expires_at,
                        last_login_at, last_login_ip, created_at
                    ) VALUES (
                        %(id)s, %(email)s, %(display_name)s, %(username)s, %(password_hash)s,
                        %(email_verified)s, %(email_verification_token)s,
                        %(password_reset_token)s, %(password_reset_expires_at)s,
                        %(last_login_at)s, %(last_login_ip)s, %(created_at)s
                    )
                    ON CONFLICT (id) DO UPDATE SET
                        email = EXCLUDED.email,
                        display_name = EXCLUDED.display_name,
                        username = EXCLUDED.username,
                        password_hash = EXCLUDED.password_hash,
                        email_verified = EXCLUDED.email_verified,
                        email_verification_token = EXCLUDED.email_verification_token,
                        password_reset_token = EXCLUDED.password_reset_token,
                        password_reset_expires_at = EXCLUDED.password_reset_expires_at,
                        last_login_at = EXCLUDED.last_login_at,
                        last_login_ip = EXCLUDED.last_login_ip
                """, {
                    "id": user.id,
                    "email": user.email,
                    "display_name": user.display_name,
                    "username": user.username,
                    "password_hash": user.password_hash,
                    "email_verified": user.email_verified,
                    "email_verification_token": user.email_verification_token,
                    "password_reset_token": user.password_reset_token,
                    "password_reset_expires_at": user.password_reset_expires_at,
                    "last_login_at": user.last_login_at,
                    "last_login_ip": user.last_login_ip,
                    "created_at": user.created_at,
                })
            conn.commit()
        finally:
            conn.close()
    
    def find_by_id(self, user_id: str) -> Optional[User]:
        """根据 ID 查找用户"""
        conn = self._get_connection()
        try:
            with conn.cursor() as cur:
                cur.execute("SELECT * FROM users WHERE id = %s", (user_id,))
                row = cur.fetchone()
                
                if row:
                    return self._row_to_user(row)
                return None
        finally:
            conn.close()
    
    def find_by_email(self, email: str) -> Optional[User]:
        """根据邮箱查找用户"""
        conn = self._get_connection()
        try:
            with conn.cursor() as cur:
                cur.execute("SELECT * FROM users WHERE email = %s", (email.lower(),))
                row = cur.fetchone()
                
                if row:
                    return self._row_to_user(row)
                return None
        finally:
            conn.close()
    
    def find_by_username(self, username: str) -> Optional[User]:
        """根据用户名查找用户"""
        conn = self._get_connection()
        try:
            with conn.cursor() as cur:
                cur.execute("SELECT * FROM users WHERE username = %s", (username.lower(),))
                row = cur.fetchone()
                
                if row:
                    return self._row_to_user(row)
                return None
        finally:
            conn.close()
    
    def find_by_verification_token(self, token: str) -> Optional[User]:
        """根据邮箱验证令牌查找用户"""
        conn = self._get_connection()
        try:
            with conn.cursor() as cur:
                cur.execute("SELECT * FROM users WHERE email_verification_token = %s", (token,))
                row = cur.fetchone()
                
                if row:
                    return self._row_to_user(row)
                return None
        finally:
            conn.close()
    
    def find_by_password_reset_token(self, token: str) -> Optional[User]:
        """根据密码重置令牌查找用户"""
        conn = self._get_connection()
        try:
            with conn.cursor() as cur:
                cur.execute("SELECT * FROM users WHERE password_reset_token = %s", (token,))
                row = cur.fetchone()
                
                if row:
                    return self._row_to_user(row)
                return None
        finally:
            conn.close()
    
    def delete(self, user_id: str) -> bool:
        """删除用户"""
        conn = self._get_connection()
        try:
            with conn.cursor() as cur:
                cur.execute("DELETE FROM users WHERE id = %s", (user_id,))
                deleted = cur.rowcount > 0
            conn.commit()
            return deleted
        finally:
            conn.close()
    
    def _row_to_user(self, row: dict) -> User:
        """将数据库行转换为 User 对象"""
        return User(
            id=row["id"],
            email=row["email"],
            display_name=row["display_name"],
            username=row["username"] or "",
            password_hash=row["password_hash"] or "",
            email_verified=row["email_verified"] or False,
            email_verification_token=row["email_verification_token"],
            password_reset_token=row["password_reset_token"],
            password_reset_expires_at=row["password_reset_expires_at"],
            last_login_at=row["last_login_at"],
            last_login_ip=row["last_login_ip"],
            created_at=row["created_at"],
        )