from typing import Any, Literal

from pydantic import BaseModel, Field


class ConceptInput(BaseModel):
    """Stage 1a — input contract. Frozen interface for frontend codegen."""

    parcel_geojson: dict[str, Any] = Field(
        ..., description="GeoJSON Polygon of the parcel (WGS84 / EPSG:4326)"
    )
    housing_class: Literal["econom", "comfort", "business"] = "comfort"
    target_floors: int = Field(9, ge=1, le=30)
    development_type: Literal["spot", "mid_rise", "high_rise"] = "mid_rise"
    land_cost_rub: float | None = Field(
        None, description="Optional land cost for financial model"
    )


class TEAP(BaseModel):
    """Технико-экономические показатели."""

    built_area_sqm: float
    total_floor_area_sqm: float
    residential_area_sqm: float
    apartments_count: int
    density: float
    parking_spaces: int


class FinancialModel(BaseModel):
    revenue_rub: float
    cost_rub: float
    gross_margin_rub: float
    irr: float


class ConceptVariant(BaseModel):
    strategy: Literal["max_area", "max_insolation", "balanced"]
    buildings_geojson: dict[str, Any]
    teap: TEAP
    financial: FinancialModel


class ConceptOutput(BaseModel):
    variants: list[ConceptVariant]