"""Pydantic schemas for Recipe and RecipeVersion operations."""
from src.backend.models.api.tipi import UtcDateTime
from typing import Optional, TYPE_CHECKING

from pydantic import BaseModel, ConfigDict, Field

if TYPE_CHECKING:
    from src.backend.models.api.task import TaskResponse


class RecipeCreate(BaseModel):
    """Schema for creating a new recipe."""
    code: str = Field(..., min_length=1, max_length=100)
    name: str = Field(..., min_length=1, max_length=255)
    description: Optional[str] = None
    image_path: Optional[str] = Field(None, max_length=500)
    measurement_interval_minutes: Optional[int] = Field(None, ge=1, le=1440)
    # Rules of the recipe: what the operator must supply, and how a value may be
    # entered. Manual input defaults to forbidden - the caliper is the instrument.
    requires_lot: bool = False
    requires_serial: bool = False
    allow_manual_input: bool = False
    # Optional task-level fields for the initial technical drawing
    file_path: Optional[str] = Field(None, max_length=500)
    file_type: Optional[str] = Field(None, pattern="^(image|pdf)$")
    annotations_json: Optional[dict] = None


class RecipeDuplicate(BaseModel):
    """Schema for duplicating a recipe (#52): only the new code and name."""
    code: str = Field(..., min_length=1, max_length=100)
    name: str = Field(..., min_length=1, max_length=255)


class RecipeUpdate(BaseModel):
    """Schema for updating a recipe (creates new version)."""
    name: Optional[str] = Field(None, min_length=1, max_length=255)
    description: Optional[str] = None
    image_path: Optional[str] = Field(None, max_length=500)
    measurement_interval_minutes: Optional[int] = Field(None, ge=1, le=1440)
    requires_lot: Optional[bool] = None
    requires_serial: Optional[bool] = None
    allow_manual_input: Optional[bool] = None
    change_notes: Optional[str] = None
    # Task-level fields: saved to the first task of the new version
    file_path: Optional[str] = Field(None, max_length=500)
    file_type: Optional[str] = Field(None, pattern="^(image|pdf)$")
    annotations_json: Optional[dict] = None


class RecipeVersionResponse(BaseModel):
    """Schema for recipe version response."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    recipe_id: int
    version_number: int
    is_current: bool
    created_by: int
    created_at: UtcDateTime
    change_notes: Optional[str] = None
    tasks: list["TaskResponse"] = []


class RecipeResponse(BaseModel):
    """Schema for recipe response."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    code: str
    name: str
    description: Optional[str] = None
    image_path: Optional[str] = None
    measurement_interval_minutes: Optional[int] = None
    # The operator's screen reads these to know whether to ask for lot and serial
    # before starting, and whether to offer the keypad at all.
    requires_lot: bool = False
    requires_serial: bool = False
    allow_manual_input: bool = False
    created_by: int
    created_at: UtcDateTime
    active: bool
    current_version: Optional[RecipeVersionResponse] = None


class RecipeListResponse(BaseModel):
    """Schema for paginated recipe list."""
    items: list[RecipeResponse]
    total: int
    page: int
    per_page: int
    pages: int


# Forward reference imports for model_rebuild
from src.backend.models.api.task import TaskResponse  # noqa: E402
RecipeVersionResponse.model_rebuild()
RecipeResponse.model_rebuild()