"""Booking schemas for request/response."""
from datetime import datetime, date
from typing import Any, Optional

from pydantic import BaseModel, Field, field_validator, model_validator


class BookingCalendarPublic(BaseModel):
    """Public booking data for regular users (calendar view)."""

    id: int
    start_datetime: datetime
    end_datetime: datetime
    status: str
    title: str

    model_config = {"from_attributes": True}


class BookingCalendarAdmin(BaseModel):
    """Full booking data for admins (calendar view)."""

    id: int
    user_id: int | None = None
    space_id: int
    start_datetime: datetime
    end_datetime: datetime
    status: str
    title: str
    description: str | None
    rejection_reason: str | None
    cancellation_reason: str | None
    approved_by: int | None
    created_at: datetime

    model_config = {"from_attributes": True}


class BookingCreate(BaseModel):
    """Schema for creating a new booking."""

    space_id: int
    start_datetime: datetime
    end_datetime: datetime
    title: str = Field(..., min_length=1, max_length=200)
    description: str | None = None


class BookingResponse(BaseModel):
    """Schema for booking response after creation."""

    id: int
    user_id: int | None = None
    space_id: int
    start_datetime: datetime
    end_datetime: datetime
    status: str
    title: str
    description: str | None
    created_at: datetime
    guest_name: str | None = None
    guest_email: str | None = None
    guest_organization: str | None = None
    is_anonymous: bool = False
    # Timezone-aware formatted strings (optional, set by endpoint)
    start_datetime_tz: Optional[str] = None
    end_datetime_tz: Optional[str] = None

    model_config = {"from_attributes": True}

    @classmethod
    def from_booking_with_timezone(cls, booking, user_timezone: str = "UTC"):
        """Create response with timezone conversion."""
        from app.utils.timezone import format_datetime_tz

        return cls(
            id=booking.id,
            user_id=booking.user_id,
            space_id=booking.space_id,
            start_datetime=booking.start_datetime,
            end_datetime=booking.end_datetime,
            status=booking.status,
            title=booking.title,
            description=booking.description,
            created_at=booking.created_at,
            guest_name=booking.guest_name,
            guest_email=booking.guest_email,
            guest_organization=booking.guest_organization,
            is_anonymous=booking.is_anonymous,
            start_datetime_tz=format_datetime_tz(booking.start_datetime, user_timezone),
            end_datetime_tz=format_datetime_tz(booking.end_datetime, user_timezone)
        )


class SpaceInBooking(BaseModel):
    """Space details embedded in booking response."""

    id: int
    name: str
    type: str
    property_id: int | None = None
    property_name: str | None = None

    model_config = {"from_attributes": True}

    @model_validator(mode="wrap")
    @classmethod
    def extract_property_name(cls, data: Any, handler: Any) -> "SpaceInBooking":
        """Extract property_name from ORM relationship."""
        instance = handler(data)
        if instance.property_name is None and hasattr(data, 'property') and data.property:
            instance.property_name = data.property.name
        return instance


class BookingWithSpace(BaseModel):
    """Booking with associated space details for user's booking list."""

    id: int
    space_id: int
    space: SpaceInBooking
    start_datetime: datetime
    end_datetime: datetime
    status: str
    title: str
    description: str | None
    created_at: datetime

    model_config = {"from_attributes": True}


class UserInBooking(BaseModel):
    """User details embedded in booking response."""

    id: int
    full_name: str
    email: str
    organization: str | None

    model_config = {"from_attributes": True}


class BookingPendingDetail(BaseModel):
    """Detailed booking information for admin pending list."""

    id: int
    space_id: int
    space: SpaceInBooking
    user_id: int | None = None
    user: UserInBooking | None = None
    start_datetime: datetime
    end_datetime: datetime
    status: str
    title: str
    description: str | None
    created_at: datetime
    guest_name: str | None = None
    guest_email: str | None = None
    guest_organization: str | None = None
    is_anonymous: bool = False

    model_config = {"from_attributes": True}


class RejectRequest(BaseModel):
    """Schema for rejecting a booking."""

    reason: str | None = None


class BookingAdminCreate(BaseModel):
    """Schema for admin to create a booking directly (bypass approval)."""

    space_id: int
    user_id: int | None = None
    start_datetime: datetime
    end_datetime: datetime
    title: str = Field(..., min_length=1, max_length=200)
    description: str | None = None


class AdminCancelRequest(BaseModel):
    """Schema for admin cancelling a booking."""

    cancellation_reason: str | None = None


class BookingUpdate(BaseModel):
    """Schema for updating a booking."""

    title: str | None = None
    description: str | None = None
    start_datetime: datetime | None = None
    end_datetime: datetime | None = None


class ConflictingBooking(BaseModel):
    """Schema for a conflicting booking in availability check."""

    id: int
    user_name: str
    title: str
    status: str
    start_datetime: datetime
    end_datetime: datetime

    model_config = {"from_attributes": True}


class AvailabilityCheck(BaseModel):
    """Schema for availability check response."""

    available: bool
    conflicts: list[ConflictingBooking]
    message: str


class BookingRecurringCreate(BaseModel):
    """Schema for creating recurring weekly bookings."""

    space_id: int
    start_time: str  # Time only (e.g., "10:00")
    duration_minutes: int
    title: str = Field(..., min_length=1, max_length=200)
    description: str | None = None
    recurrence_days: list[int] = Field(..., min_length=1, max_length=7)  # 0=Monday, 6=Sunday
    start_date: date  # First occurrence date
    end_date: date  # Last occurrence date
    skip_conflicts: bool = True  # Skip conflicted dates or stop

    @field_validator('recurrence_days')
    @classmethod
    def validate_days(cls, v: list[int]) -> list[int]:
        """Validate recurrence days are valid weekdays."""
        if not all(0 <= day <= 6 for day in v):
            raise ValueError('Days must be 0-6 (0=Monday, 6=Sunday)')
        return sorted(list(set(v)))  # Remove duplicates and sort

    @field_validator('end_date')
    @classmethod
    def validate_date_range(cls, v: date, info) -> date:
        """Validate end date is after start date and within 1 year."""
        if 'start_date' in info.data and v < info.data['start_date']:
            raise ValueError('end_date must be after start_date')

        # Max 1 year
        if 'start_date' in info.data and (v - info.data['start_date']).days > 365:
            raise ValueError('Recurrence period cannot exceed 1 year')

        return v


class RecurringBookingResult(BaseModel):
    """Schema for recurring booking creation result."""

    total_requested: int
    total_created: int
    total_skipped: int
    created_bookings: list[BookingResponse]
    skipped_dates: list[dict]  # [{"date": "2024-01-01", "reason": "..."}, ...]


class BookingReschedule(BaseModel):
    """Schema for rescheduling a booking (drag-and-drop)."""

    start_datetime: datetime
    end_datetime: datetime


class AnonymousBookingCreate(BaseModel):
    """Schema for anonymous/guest booking creation."""

    space_id: int
    start_datetime: datetime
    end_datetime: datetime
    title: str = Field(..., min_length=1, max_length=200)
    description: str | None = None
    guest_name: str = Field(..., min_length=1)
    guest_email: str = Field(..., min_length=1)
    guest_organization: str | None = None