"""Pydantic request/response models for the GODSEED HTTP API.

Shapes follow ARCHITECTURE.md §HTTP API exactly:

  GET  /api/state        -> StateResponse
  POST /api/wish {text}  -> WishAccepted   (errors: 400/429/503 with a poetic `detail` string)
  GET  /api/wishes       -> list[WishSummary]
  GET  /api/wishes/{id}  -> raw WishTrace dict (passed through, engine-owned shape)

Features and WishTraces are deliberately NOT strict models here: the engine owns those
shapes and the server passes them through untouched (the "her" pattern — transport never
reinterprets world facts).
"""

from __future__ import annotations

from typing import Any, Optional

from pydantic import BaseModel, ConfigDict, Field, field_validator

# The moderation fast-path enforces the real wish limit (<=140 chars) with a poetic
# reason; this transport-level cap only stops abusive megabyte bodies before they
# reach moderation.
TRANSPORT_MAX_WISH_CHARS = 2000


class WishRequest(BaseModel):
    """Body of POST /api/wish."""

    model_config = ConfigDict(str_strip_whitespace=True)

    text: str = Field(..., min_length=1, max_length=TRANSPORT_MAX_WISH_CHARS)

    @field_validator("text")
    @classmethod
    def _not_blank(cls, value: str) -> str:
        if not value.strip():
            raise ValueError("a wish needs words")
        return value.strip()


class WishAccepted(BaseModel):
    """Response of POST /api/wish."""

    wish_id: str
    position: int = Field(..., ge=1, description="1-based place in the queue")


class CurrentWish(BaseModel):
    """The wish the god is granting right now."""

    wish_id: str
    text_preview: str


class QueueInfo(BaseModel):
    length: int = 0
    current: Optional[CurrentWish] = None


class WorldState(BaseModel):
    """Snapshot of the deterministic world: ordered feature list + counters."""

    version: int = Field(..., ge=0, description="total number of features")
    epoch: int = Field(..., ge=0, description="number of granted wishes")
    features: list[dict[str, Any]]


class WishSummary(BaseModel):
    """One row of the Genesis Log index (GET /api/wishes)."""

    wish_id: str
    text: str
    epitaph: str = ""
    epoch: int
    ts: float


class StateResponse(BaseModel):
    """GET /api/state."""

    world: WorldState
    queue: QueueInfo
    wishes_recent: list[WishSummary]