"""
统一的 Pydantic 数据模型
"""

from pydantic import BaseModel, field_validator, ConfigDict
from typing import Optional, List, Union
from datetime import date, datetime


# ==================== 车辆相关模型 ====================


class VehicleBase(BaseModel):
    """车辆基础模型"""

    name: str
    purchase_date: Optional[date] = None
    initial_mileage: int = 0


class VehicleCreate(VehicleBase):
    """创建车辆请求模型"""

    pass


class VehicleUpdate(BaseModel):
    """更新车辆请求模型"""

    id: int
    name: Optional[str] = None
    purchase_date: Optional[date] = None
    initial_mileage: Optional[int] = None


class VehicleDelete(BaseModel):
    """删除车辆请求模型"""

    id: int


class VehicleResponse(VehicleBase):
    """车辆响应模型"""

    id: int
    is_deleted: bool = False
    created_at: Optional[datetime] = None
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True


class VehicleStats(BaseModel):
    """车辆统计信息"""

    total_mileage: int
    total_fuel_cost: float
    total_fuel_amount: float
    avg_fuel_consumption: Optional[float]


# ==================== 加油记录相关模型 ====================


class FuelRecordBase(BaseModel):
    """加油记录基础模型"""

    vehicle_id: int
    date: date
    mileage: int
    fuel_amount: float
    fuel_price: Optional[float] = None
    total_cost: Optional[float] = None
    is_full_tank: bool = True
    notes: Optional[str] = ""


class FuelRecordCreate(FuelRecordBase):
    """创建加油记录请求模型"""

    @field_validator("total_cost", "fuel_price", mode="before")
    @classmethod
    def validate_costs(cls, v):
        if v is not None:
            return round(v, 2)
        return v


class FuelRecordUpdate(BaseModel):
    """更新加油记录请求模型"""

    model_config = ConfigDict(arbitrary_types_allowed=True)

    id: int
    date: Union[date, str, None] = None
    mileage: Optional[int] = None
    fuel_amount: Optional[float] = None
    fuel_price: Optional[float] = None
    total_cost: Optional[float] = None
    is_full_tank: Optional[bool] = None
    notes: Optional[str] = None

    @field_validator("date", mode="before")
    @classmethod
    def parse_date(cls, v):
        if v is None:
            return None
        if isinstance(v, date):
            return v
        if isinstance(v, str):
            return date.fromisoformat(v)
        raise ValueError("Invalid date format")


class FuelRecordDelete(BaseModel):
    """删除加油记录请求模型"""

    id: int


class FuelRecordResponse(BaseModel):
    """加油记录响应模型"""

    id: int
    vehicle_id: int
    date: date
    mileage: int
    fuel_amount: float
    fuel_price: Optional[float]
    total_cost: float
    is_full_tank: bool
    notes: str
    fuel_consumption: Optional[float] = None  # 单次油耗，计算得出
    is_deleted: bool = False
    created_at: Optional[datetime] = None
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True


# ==================== 费用记录相关模型 ====================

# 费用类型枚举
COST_TYPES = ["保养", "维修", "保险", "停车", "过路费", "洗车", "违章", "其他"]


class CostBase(BaseModel):
    """费用记录基础模型"""

    vehicle_id: int
    date: date
    type: str
    amount: float
    mileage: Optional[int] = None
    notes: Optional[str] = ""
    is_installment: Optional[bool] = False
    installment_months: Optional[int] = 12


class CostCreate(CostBase):
    """创建费用记录请求模型"""

    pass


class CostUpdate(BaseModel):
    """更新费用记录请求模型"""

    model_config = ConfigDict(arbitrary_types_allowed=True)

    id: int
    date: Union[date, str, None] = None
    type: Optional[str] = None
    amount: Optional[float] = None
    mileage: Optional[int] = None
    notes: Optional[str] = None
    is_installment: Optional[bool] = None
    installment_months: Optional[int] = None

    @field_validator("date", mode="before")
    @classmethod
    def parse_date(cls, v):
        if v is None:
            return None
        if isinstance(v, date):
            return v
        if isinstance(v, str):
            return date.fromisoformat(v)
        raise ValueError("Invalid date format")


class CostDelete(BaseModel):
    """删除费用记录请求模型"""

    id: int


class CostResponse(BaseModel):
    """费用记录响应模型"""

    id: int
    vehicle_id: int
    date: date
    type: str
    amount: float
    mileage: Optional[int]
    notes: str
    is_installment: bool
    installment_months: int
    is_deleted: bool = False
    created_at: Optional[datetime] = None
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True


# ==================== 仪表板相关模型 ====================


class FuelRecordItem(BaseModel):
    """仪表板中使用的加油记录项"""

    id: int
    date: date
    mileage: int
    fuel_amount: float
    total_cost: float
    fuel_consumption: Optional[float]


class DashboardData(BaseModel):
    """仪表板数据响应"""

    vehicle_id: int
    vehicle_name: str
    purchase_date: Optional[date]
    total_mileage: int
    total_fuel_cost: float
    avg_fuel_consumption: Optional[float]
    avg_daily_km: Optional[float]
    recent_fuel_records: List[FuelRecordItem]


# ==================== 通用响应模型 ====================


class MessageResponse(BaseModel):
    """通用消息响应"""

    message: str


class CostTypesResponse(BaseModel):
    """费用类型列表响应"""

    types: List[str]