"""
系統設定與日誌資料模型
"""
from datetime import datetime
from sqlalchemy import String, ForeignKey, Text, JSON, Enum as SQLEnum, Index
from sqlalchemy.orm import Mapped, mapped_column, relationship
from typing import Optional, TYPE_CHECKING
import enum

from app.db.session import Base

if TYPE_CHECKING:
    from app.models.user import User
    from app.models.report import Report


class SettingType(str, enum.Enum):
    """設定值類型"""
    STRING = "string"
    NUMBER = "number"
    BOOLEAN = "boolean"
    JSON = "json"


class NotificationType(str, enum.Enum):
    """通知類型"""
    EMAIL = "email"
    SYSTEM = "system"


class NotificationStatus(str, enum.Enum):
    """通知狀態"""
    PENDING = "pending"
    SENT = "sent"
    FAILED = "failed"


class SystemSetting(Base):
    """系統設定表"""
    __tablename__ = "system_settings"
    
    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    setting_key: Mapped[str] = mapped_column(String(50), unique=True, nullable=False, comment="設定鍵")
    setting_value: Mapped[Optional[str]] = mapped_column(Text, comment="設定值")
    setting_type: Mapped[SettingType] = mapped_column(SQLEnum(SettingType), default=SettingType.STRING)
    description: Mapped[Optional[str]] = mapped_column(String(200), comment="設定描述")
    updated_by: Mapped[Optional[int]] = mapped_column(ForeignKey("users.id"), comment="更新者ID")
    updated_at: Mapped[datetime] = mapped_column(default=datetime.utcnow, onupdate=datetime.utcnow)
    
    def get_value(self):
        """取得轉換後的設定值"""
        if self.setting_value is None:
            return None
        if self.setting_type == SettingType.NUMBER:
            return float(self.setting_value) if '.' in self.setting_value else int(self.setting_value)
        if self.setting_type == SettingType.BOOLEAN:
            return self.setting_value.lower() in ('true', '1', 'yes')
        if self.setting_type == SettingType.JSON:
            import json
            return json.loads(self.setting_value)
        return self.setting_value


class AuditLog(Base):
    """操作日誌表"""
    __tablename__ = "audit_logs"
    __table_args__ = (
        Index("idx_audit_user", "user_id"),
        Index("idx_audit_action", "action"),
        Index("idx_audit_created", "created_at"),
    )
    
    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    user_id: Mapped[Optional[int]] = mapped_column(ForeignKey("users.id"), comment="操作用戶ID")
    action: Mapped[str] = mapped_column(String(50), nullable=False, comment="操作類型")
    target_type: Mapped[Optional[str]] = mapped_column(String(50), comment="目標類型")
    target_id: Mapped[Optional[str]] = mapped_column(String(50), comment="目標ID")
    details: Mapped[Optional[dict]] = mapped_column(JSON, comment="操作詳情")
    ip_address: Mapped[Optional[str]] = mapped_column(String(45), comment="IP地址")
    user_agent: Mapped[Optional[str]] = mapped_column(String(500), comment="User Agent")
    created_at: Mapped[datetime] = mapped_column(default=datetime.utcnow)


class NotificationLog(Base):
    """通知記錄表"""
    __tablename__ = "notification_logs"
    __table_args__ = (
        Index("idx_notification_status", "status"),
    )
    
    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=False)
    report_id: Mapped[Optional[int]] = mapped_column(ForeignKey("reports.id"), comment="關聯報告ID")
    notification_type: Mapped[NotificationType] = mapped_column(SQLEnum(NotificationType), default=NotificationType.EMAIL)
    subject: Mapped[Optional[str]] = mapped_column(String(200), comment="通知標題")
    content: Mapped[Optional[str]] = mapped_column(Text, comment="通知內容")
    status: Mapped[NotificationStatus] = mapped_column(SQLEnum(NotificationStatus), default=NotificationStatus.PENDING)
    sent_at: Mapped[Optional[datetime]] = mapped_column()
    error_message: Mapped[Optional[str]] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(default=datetime.utcnow)
    
    # 關聯
    report: Mapped[Optional["Report"]] = relationship(back_populates="notifications")