from datetime import date, datetime, time

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

APPOINTMENT_STATUSES = {
    "draft",
    "requested",
    "confirmed",
    "proposed_new_time",
    "rejected",
    "cancelled_by_customer",
    "cancelled_by_sto",
    "completed",
    "no_show",
}


class AvailableSlotRead(BaseModel):
    start_at: datetime
    end_at: datetime


class ServiceCatalogItem(BaseModel):
    id: int
    display_name: str | None = None
    name: str
    city: str | None = None
    address: str | None = None
    specializations: list[str] | None = None
    working_hours: str | None = None
    rating_avg: float | None = None
    reviews_count: int = 0
    nearest_slot_at: datetime | None = None
    accepts_online_booking: bool = True


class ServiceCenterBookingSettingsUpsert(BaseModel):
    service_center_id: int
    working_days: list[int] = Field(default_factory=lambda: [0, 1, 2, 3, 4])
    open_time: time = time(9, 0)
    close_time: time = time(18, 0)
    lunch_break_start: time | None = None
    lunch_break_end: time | None = None
    timezone: str = "Asia/Seoul"
    slot_duration_minutes: int = Field(default=30, ge=10, le=240)
    booking_buffer_minutes: int = Field(default=0, ge=0, le=240)
    max_parallel_bookings: int = Field(default=1, ge=1, le=20)
    accepts_online_booking: bool = True

    @field_validator("working_days")
    @classmethod
    def validate_working_days(cls, value: list[int]) -> list[int]:
        days = sorted(set(value))
        if any(day < 0 or day > 6 for day in days):
            raise ValueError("working_days must contain ISO weekdays 0..6")
        return days

    @model_validator(mode="after")
    def validate_times(self) -> "ServiceCenterBookingSettingsUpsert":
        if self.open_time >= self.close_time:
            raise ValueError("open_time must be before close_time")
        if bool(self.lunch_break_start) != bool(self.lunch_break_end):
            raise ValueError("both lunch break boundaries are required")
        if self.lunch_break_start and self.lunch_break_end and self.lunch_break_start >= self.lunch_break_end:
            raise ValueError("lunch_break_start must be before lunch_break_end")
        return self


class ServiceCenterBookingSettingsRead(ServiceCenterBookingSettingsUpsert):
    id: int
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class ServiceCenterHolidayCreate(BaseModel):
    service_center_id: int
    holiday_date: date
    reason: str | None = None


class ServiceCenterHolidayRead(ServiceCenterHolidayCreate):
    id: int
    created_at: datetime

    model_config = ConfigDict(from_attributes=True)


class AppointmentCreate(BaseModel):
    service_center_id: int
    vehicle_id: int
    service_type: str = Field(default="maintenance", max_length=64)
    service_name: str = Field(default="Обслуживание", max_length=180)
    requested_start_at: datetime
    estimated_duration_minutes: int = Field(default=60, ge=10, le=1440)
    customer_comment: str | None = Field(default=None, max_length=4000)
    source_recommendation_id: int | None = None


class AppointmentRead(BaseModel):
    id: int
    service_center_id: int
    vehicle_id: int
    owner_id: int
    created_by: int
    service_type: str
    service_name: str
    requested_start_at: datetime
    requested_end_at: datetime
    confirmed_start_at: datetime | None = None
    confirmed_end_at: datetime | None = None
    proposed_start_at: datetime | None = None
    proposed_end_at: datetime | None = None
    estimated_duration_minutes: int
    status: str
    customer_comment: str | None = None
    service_center_comment: str | None = None
    source_recommendation_id: int | None = None
    linked_work_order_id: int | None = None
    cancellation_reason: str | None = None
    cancelled_at: datetime | None = None
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class AppointmentDecision(BaseModel):
    comment: str | None = Field(default=None, max_length=4000)


class AppointmentProposeTime(BaseModel):
    proposed_start_at: datetime
    estimated_duration_minutes: int | None = Field(default=None, ge=10, le=1440)
    comment: str | None = Field(default=None, max_length=4000)


class AppointmentCancel(BaseModel):
    reason: str | None = Field(default=None, max_length=1000)


class AppointmentCreateWorkOrder(BaseModel):
    odometer: int | None = None
    notes: str | None = Field(default=None, max_length=4000)


class MaintenanceRecommendationCreate(BaseModel):
    recommendation_type: str = Field(max_length=64)
    title: str = Field(max_length=180)
    description: str | None = None
    due_odometer_km: int | None = None
    due_date: date | None = None
    priority: str = "medium"
    source: str = "user_rule"


class MaintenanceRecommendationRead(MaintenanceRecommendationCreate):
    id: int
    vehicle_id: int
    status: str
    source_service_center_id: int | None = None
    source_appointment_id: int | None = None
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class MaintenanceRecommendationBook(BaseModel):
    appointment_id: int


class STODashboardRead(BaseModel):
    service_center_id: int
    connected_vehicles: int
    pending_vehicle_links: int
    active_appointments: int
    pending_appointments: int
    confirmed_appointments: int
    active_work_orders: int
    completed_work_orders_month: int
    revenue_month: float
    average_check_month: float
    rating_avg: float | None = None
    reviews_count: int
    warnings: list[str]