"""
部門 Schemas (統一樹狀結構)
"""
from datetime import datetime
from typing import Optional, List, Any
from pydantic import Field, ConfigDict

from app.schemas.base import BaseSchema


class DepartmentBase(BaseSchema):
    """部門基礎 Schema"""

    name: str = Field(..., min_length=2, max_length=100, description="部門名稱")
    name_en: Optional[str] = Field(None, max_length=100, description="英文名稱")
    code: str = Field(..., min_length=1, max_length=20, description="部門代碼")
    description: Optional[str] = Field(None, description="說明")


class DepartmentCreate(DepartmentBase):
    """創建部門 Schema

    - parent_id=NULL: 建立第一層部門，可設定 email_domain
    - parent_id=有值: 建立子部門，不可設定 email_domain (繼承)
    """

    parent_id: Optional[int] = Field(None, description="上層部門 ID (NULL=第一層)")
    email_domain: Optional[str] = Field(None, max_length=100,
                                         description="郵件網域 (只有第一層可設定，例如 ease.taipei)")
    email_address: Optional[str] = Field(None, max_length=255, description="部門信箱")
    email_quota_mb: Optional[int] = Field(5120, description="部門信箱配額 (MB)")

    model_config = ConfigDict(
        json_schema_extra={
            "example": {
                "parent_id": None,
                "name": "業務發展部",
                "name_en": "Business Development",
                "code": "BD",
                "email_domain": "ease.taipei",
                "description": "業務發展相關部門"
            }
        }
    )


class DepartmentUpdate(BaseSchema):
    """更新部門 Schema

    注意: code 和 parent_id 建立後不可修改
    email_domain 只有第一層 (depth=0) 可更新
    """

    name: Optional[str] = Field(None, min_length=2, max_length=100)
    name_en: Optional[str] = Field(None, max_length=100)
    description: Optional[str] = None
    email_domain: Optional[str] = Field(None, max_length=100,
                                         description="只有第一層部門可更新")
    email_address: Optional[str] = Field(None, max_length=255)
    email_quota_mb: Optional[int] = None
    is_active: Optional[bool] = None


class DepartmentResponse(BaseSchema):
    """部門響應 Schema"""

    id: int
    tenant_id: int
    parent_id: Optional[int] = None
    code: str
    name: str
    name_en: Optional[str] = None
    depth: int
    email_domain: Optional[str] = None
    effective_email_domain: Optional[str] = None
    email_address: Optional[str] = None
    email_quota_mb: int
    description: Optional[str] = None
    is_active: bool
    is_top_level: bool = False
    created_at: datetime
    parent_name: Optional[str] = None
    member_count: Optional[int] = None

    model_config = ConfigDict(from_attributes=True)


class DepartmentListItem(BaseSchema):
    """部門列表項 Schema"""

    id: int
    tenant_id: int
    parent_id: Optional[int] = None
    code: str
    name: str
    depth: int
    email_domain: Optional[str] = None
    effective_email_domain: Optional[str] = None
    email_address: Optional[str] = None
    is_active: bool
    member_count: Optional[int] = None

    model_config = ConfigDict(from_attributes=True)


class DepartmentTreeNode(BaseSchema):
    """部門樹狀節點 Schema (遞迴)"""

    id: int
    code: str
    name: str
    name_en: Optional[str] = None
    depth: int
    parent_id: Optional[int] = None
    email_domain: Optional[str] = None
    effective_email_domain: Optional[str] = None
    email_address: Optional[str] = None
    email_quota_mb: int
    description: Optional[str] = None
    is_active: bool
    is_top_level: bool
    member_count: int = 0
    children: List[Any] = []

    model_config = ConfigDict(from_attributes=True)