from datetime import date, datetime
from decimal import Decimal

from pydantic import BaseModel, ConfigDict, Field, field_validator, model_validator

from app.services.vehicle_identity import normalize_license_plate, validate_vin


class ServiceCenterCreate(BaseModel):
    legal_name: str | None = None
    display_name: str
    country: str | None = None
    city: str | None = None
    address: str | None = None
    phone: str | None = None
    business_registration_number: str | None = None
    telegram_chat_id: str | None = None
    contact_phone: str | None = None
    description: str | None = None
    specializations: list[str] | None = None
    working_hours: str | None = None
    facade_photo_url: str | None = None
    document_photo_urls: list[str] | None = None
    additional_photo_urls: list[str] | None = None
    contact_person: str | None = None


class ServiceCenterRead(ServiceCenterCreate):
    id: int
    name: str
    verification_status: str
    owner_user_id: int | None = None
    created_at: datetime
    verified_at: datetime | None = None
    suspended_at: datetime | None = None
    rating_avg: Decimal | None = None
    reviews_count: int = 0

    model_config = ConfigDict(from_attributes=True)


class ServiceCenterPublicRead(BaseModel):
    id: int
    display_name: str | None = None
    name: str
    country: str | None = None
    city: str | None = None
    address: str | None = None
    phone: str | None = None
    description: str | None = None
    specializations: list[str] | None = None
    working_hours: str | None = None
    facade_photo_url: str | None = None
    verification_status: str
    rating_avg: Decimal | None = None
    reviews_count: int = 0

    model_config = ConfigDict(from_attributes=True)


class ServiceCenterVerificationCreate(BaseModel):
    submitted_documents: list[dict] | None = None
    comment: str | None = None


class ServiceCenterVerificationRead(ServiceCenterVerificationCreate):
    id: int
    service_center_id: int
    status: str
    reviewed_by: int | None = None
    reviewed_at: datetime | None = None
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class ServiceEmployeeInvite(BaseModel):
    telegram_id: int
    role: str = "receptionist"
    permissions: dict | None = None


class ServiceEmployeeRead(BaseModel):
    id: int
    service_center_id: int
    user_id: int
    role: str
    permissions: dict | None = None
    status: str
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class VehicleAccessGrant(BaseModel):
    service_center_id: int | None = None
    user_id: int | None = None
    role: str = "viewer"


class VehicleAccessRead(BaseModel):
    id: int
    vehicle_id: int
    user_id: int
    role: str
    status: str
    created_at: datetime
    revoked_at: datetime | None = None

    model_config = ConfigDict(from_attributes=True)


class VehicleCreate(BaseModel):
    name: str
    make: str | None = None
    model: str | None = None
    trim: str | None = None
    generation: str | None = None
    body_type: str | None = None
    year: int | None = None
    license_plate: str | None = None
    license_plate_country: str | None = None
    vin: str | None = None
    current_odometer: int | None = None
    fuel_type: str | None = None
    engine_volume_l: Decimal | None = None
    transmission: str | None = None
    drive_type: str | None = None
    engine_oil_type: str | None = None
    engine_oil_volume_l: Decimal | None = None
    transmission_fluid_type: str | None = None
    transmission_fluid_volume_l: Decimal | None = None
    coolant_type: str | None = None
    brake_fluid_type: str | None = None
    tire_pressure_front_bar: Decimal | None = None
    tire_pressure_rear_bar: Decimal | None = None
    tire_size: str | None = None
    oil_change_interval_km: int | None = None
    oil_change_interval_months: int | None = None
    fuel_tank_volume_l: Decimal | None = None
    target_consumption_l_per_100km: Decimal | None = None
    purchase_date: date | None = None
    purchase_price: Decimal | None = None
    purchase_currency: str | None = None
    purchase_type: str = "unknown"
    currency: str = "RUB"
    include_depreciation: bool = False
    expected_ownership_months: int | None = None
    expected_residual_value: Decimal | None = None
    loan_principal: Decimal | None = None
    loan_down_payment: Decimal | None = None
    loan_term_months: int | None = None
    loan_annual_interest_rate: Decimal | None = None
    loan_first_payment_date: date | None = None
    loan_payment_day: int | None = None
    loan_payment_type: str = "annuity"
    loan_currency: str | None = None
    loan_comment: str | None = None
    notes: str | None = None

    @field_validator("vin")
    @classmethod
    def validate_vin_field(cls, value: str | None) -> str | None:
        return validate_vin(value)


class VehicleUpdate(BaseModel):
    name: str | None = None
    make: str | None = None
    model: str | None = None
    trim: str | None = None
    generation: str | None = None
    body_type: str | None = None
    year: int | None = None
    license_plate: str | None = None
    license_plate_country: str | None = None
    vin: str | None = None
    current_odometer: int | None = None
    fuel_type: str | None = None
    engine_volume_l: Decimal | None = None
    transmission: str | None = None
    drive_type: str | None = None
    fuel_tank_volume_l: Decimal | None = None
    target_consumption_l_per_100km: Decimal | None = None
    purchase_date: date | None = None
    purchase_price: Decimal | None = None
    purchase_currency: str | None = None
    purchase_type: str | None = None
    currency: str | None = None
    include_depreciation: bool | None = None
    expected_ownership_months: int | None = None
    expected_residual_value: Decimal | None = None
    engine_oil_type: str | None = None
    engine_oil_volume_l: Decimal | None = None
    transmission_fluid_type: str | None = None
    transmission_fluid_volume_l: Decimal | None = None
    coolant_type: str | None = None
    brake_fluid_type: str | None = None
    tire_pressure_front_bar: Decimal | None = None
    tire_pressure_rear_bar: Decimal | None = None
    tire_size: str | None = None
    oil_change_interval_km: int | None = None
    oil_change_interval_months: int | None = None
    loan_principal: Decimal | None = None
    loan_down_payment: Decimal | None = None
    loan_term_months: int | None = None
    loan_annual_interest_rate: Decimal | None = None
    loan_first_payment_date: date | None = None
    loan_payment_day: int | None = None
    loan_payment_type: str | None = None
    loan_currency: str | None = None
    loan_comment: str | None = None
    notes: str | None = None

    @field_validator("vin")
    @classmethod
    def validate_vin_field(cls, value: str | None) -> str | None:
        return validate_vin(value)


class VehicleRead(BaseModel):
    id: int
    owner_id: int
    name: str
    make: str | None = None
    model: str | None = None
    trim: str | None = None
    generation: str | None = None
    body_type: str | None = None
    year: int | None = None
    license_plate_display: str | None = None
    license_plate_country: str | None = None
    vin_normalized: str | None = None
    current_odometer: int | None = None
    fuel_type: str | None = None
    engine_volume_l: Decimal | None = None
    transmission: str | None = None
    drive_type: str | None = None
    fuel_tank_volume_l: Decimal | None = None
    target_consumption_l_per_100km: Decimal | None = None
    purchase_date: date | None = None
    purchase_price: Decimal | None = None
    purchase_currency: str | None = None
    purchase_type: str = "unknown"
    currency: str = "RUB"
    include_depreciation: bool = False
    expected_ownership_months: int | None = None
    expected_residual_value: Decimal | None = None
    engine_oil_type: str | None = None
    engine_oil_volume_l: Decimal | None = None
    transmission_fluid_type: str | None = None
    transmission_fluid_volume_l: Decimal | None = None
    coolant_type: str | None = None
    brake_fluid_type: str | None = None
    tire_pressure_front_bar: Decimal | None = None
    tire_pressure_rear_bar: Decimal | None = None
    tire_size: str | None = None
    oil_change_interval_km: int | None = None
    oil_change_interval_months: int | None = None
    loan_principal: Decimal | None = None
    loan_down_payment: Decimal | None = None
    loan_term_months: int | None = None
    loan_annual_interest_rate: Decimal | None = None
    loan_first_payment_date: date | None = None
    loan_payment_day: int | None = None
    loan_payment_type: str = "annuity"
    loan_currency: str | None = None
    loan_comment: str | None = None
    notes: str | None = None
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class ServiceVisitCreate(BaseModel):
    vehicle_id: int
    visit_date: date
    odometer: int | None = None
    notes: str | None = None
    total_cost: Decimal | None = None
    currency: str = "RUB"


class ServiceVisitRead(ServiceVisitCreate):
    id: int
    service_center_id: int
    created_by_employee_id: int | None = None
    status: str
    owner_resolved_at: datetime | None = None
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class ServiceWorkItemCreate(BaseModel):
    work_type: str = "other"
    title: str
    description: str | None = None
    parts: list[dict] | None = None
    oil_brand: str | None = None
    oil_viscosity: str | None = None
    oil_volume: Decimal | None = None
    next_due_odometer: int | None = None
    next_due_date: date | None = None
    price: Decimal | None = None


class ServiceWorkItemRead(ServiceWorkItemCreate):
    id: int
    service_visit_id: int
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class VehicleDataChangeRequestCreate(BaseModel):
    vehicle_id: int
    field_name: str
    new_value: str | None = None


class VehicleDataChangeRequestRead(VehicleDataChangeRequestCreate):
    id: int
    requested_by_service_center_id: int | None = None
    requested_by_employee_id: int | None = None
    old_value: str | None = None
    status: str
    owner_user_id: int
    created_at: datetime
    resolved_at: datetime | None = None

    model_config = ConfigDict(from_attributes=True)


class VehicleSearchRequest(BaseModel):
    license_plate: str | None = None
    country_code: str | None = None
    vin: str | None = None

    @field_validator("vin")
    @classmethod
    def validate_vin_field(cls, value: str | None) -> str | None:
        return validate_vin(value)

    @field_validator("license_plate")
    @classmethod
    def normalize_plate_field(cls, value: str | None) -> str | None:
        return normalize_license_plate(value)


class VehicleSearchResult(BaseModel):
    vehicle_id: int | None = None
    make: str | None = None
    model: str | None = None
    year: int | None = None
    masked_license_plate: str | None = None
    masked_vin: str | None = None
    access_status: str = "none"


class CarServiceLinkCreate(BaseModel):
    car_id: int
    service_center_id: int
    external_vehicle_ref: str | None = None
    access_level: str = "basic"
    is_active: bool = True


class CarServiceLinkRead(CarServiceLinkCreate):
    id: int
    status: str = "pending"
    requested_by_user_id: int | None = None
    approved_by_user_id: int | None = None
    approved_at: datetime | None = None
    revoked_at: datetime | None = None
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class ServiceCenterAccessRequest(BaseModel):
    car_id: int
    access_level: str = "basic"
    external_vehicle_ref: str | None = None

    @field_validator("access_level")
    @classmethod
    def validate_access_level(cls, value: str) -> str:
        allowed = {"basic", "service_history", "full"}
        if value not in allowed:
            raise ValueError(f"access_level must be one of {', '.join(sorted(allowed))}")
        return value


class ServiceCenterReviewCreate(BaseModel):
    rating: int = Field(ge=1, le=5)
    text: str | None = None
    photo_urls: list[str] | None = None

    @model_validator(mode="after")
    def validate_review(self) -> "ServiceCenterReviewCreate":
        if self.text is not None and len(self.text.strip()) < 3:
            raise ValueError("review text is too short")
        return self


class ServiceCenterReviewRead(ServiceCenterReviewCreate):
    id: int
    service_center_id: int
    user_id: int
    status: str
    service_response: str | None = None
    service_responded_at: datetime | None = None
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class ServiceCenterReviewCommentCreate(BaseModel):
    text: str = Field(min_length=2, max_length=2000)


class ServiceCenterReviewCommentRead(ServiceCenterReviewCommentCreate):
    id: int
    review_id: int
    user_id: int
    status: str
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class ServiceInboxCreate(BaseModel):
    source_chat_id: str | None = None
    raw_text: str
    car_id: int | None = None
    service_center_id: int | None = None


class ServiceInboxRead(ServiceInboxCreate):
    id: int
    parsed_status: str
    parsed_payload: str | None = None
    error: str | None = None
    created_at: datetime


class AdminModerationDecision(BaseModel):
    comment: str | None = None
    reason: str | None = None

    model_config = ConfigDict(from_attributes=True)