"""
Schemas for Items and related entities
Complete nested one-to-one structure:
Item -> LineItem -> LineFinancial -> LineQuantity -> LineCustoms -> LineDescription -> LineReference
"""

from typing import Optional
from datetime import datetime
from decimal import Decimal
from pydantic import BaseModel, Field, ConfigDict

# Import schemas from individual modules
from .line_items.schemas import (
    LineItemCreate,
    LineItemUpdate,
    LineItemResponse
)


# ============================================================================
# ITEM SCHEMAS
# ============================================================================

class ItemBase(BaseModel):
    """Base schema for items"""
    invoice_id: int = Field(..., description="Invoice ID")
    reference_number: Optional[str] = Field(
        None, max_length=20, description="Reference number")
    order: Optional[str] = Field(None, max_length=50, description="Order")
    guide_number: Optional[str] = Field(
        None, max_length=50, description="Guide number")

    # Dates
    depreciation_date: Optional[int] = Field(
        None, description="Depreciation date")

    # Administrative fields
    rectification: Optional[int] = Field(None, description="Rectification")
    warehouse: Optional[str] = Field(
        None, max_length=30, description="Warehouse")
    location: Optional[str] = Field(
        None, max_length=200, description="Location")


class ItemCreate(ItemBase):
    """Schema for creating item with nested lines (one-to-many)"""
    lines: Optional[list[LineItemCreate]] = Field(
        default=[], description="List of line items")


class ItemUpdate(ItemBase):
    """Schema for updating item"""
    invoice_id: Optional[int] = Field(None, description="Invoice ID")
    lines: Optional[list[LineItemUpdate]] = Field(
        None, description="List of line items to update")


class ItemResponse(ItemBase):
    """Schema for item response with nested data (one-to-many)"""
    id: int
    lines: list[LineItemResponse] = Field(
        default=[], description="List of line items")

    model_config = ConfigDict(from_attributes=True)


class ItemListResponse(BaseModel):
    """Schema for paginated item list"""
    total: int = Field(..., description="Total number of items")
    items: list[ItemResponse] = Field(..., description="List of items")
    skip: int = Field(..., description="Number of skipped items")
    limit: int = Field(..., description="Maximum items per page")

    model_config = ConfigDict(from_attributes=True)