"""Vector simplification models."""
from __future__ import annotations
from typing import Literal
from pydantic import BaseModel, ConfigDict, Field
from src.models.resourceref import ResourceRef
SimplifyMethod = Literal["douglas-peucker", "visvalingam"]
class Params(BaseModel):
"""Parameters for vector simplification."""
tolerance: float = Field(
description="Simplification tolerance in CRS units (larger = more simplified)",
gt=0,
)
method: SimplifyMethod = Field(
"douglas-peucker",
description="Simplification algorithm: douglas-peucker (default, fast) or "
"visvalingam (area-based, preserves shape better)",
)
preserve_topology: bool = Field(
True,
description="Ensure output geometries are valid (no self-intersections)",
)
model_config = ConfigDict()
class Result(BaseModel):
"""Result of a vector simplification operation."""
output: ResourceRef = Field(description="Reference to the output vector file")
feature_count: int = Field(ge=0, description="Number of features simplified")
tolerance: float = Field(description="Tolerance applied")
method: str = Field(description="Simplification method used")
preserve_topology: bool = Field(description="Whether topology was preserved")
bounds: list[float] | None = Field(
None,
min_length=4,
max_length=4,
description="Output bounds [minx, miny, maxx, maxy]",
)
