"""Saved thumbnail rendering parameters; source pixels are never decorated."""

from pydantic import Field

from pigway_frame_flow.errors import ErrorCode as E
from pigway_frame_flow.errors import FlowError
from pigway_frame_flow.models import StrictModel
from pigway_frame_flow.renderers.images import convert
from pigway_frame_flow.storage.database import encode


class ThumbnailPlan(StrictModel):
    name: str = Field(min_length=1, max_length=120)
    width: int = Field(default=410, ge=16, le=2048)
    height: int = Field(default=502, ge=16, le=2048)
    fit: str = Field(default="cover", pattern="^(cover|contain)$")
    center_x: float = Field(default=0.5, ge=0, le=1, allow_inf_nan=False)
    center_y: float = Field(default=0.5, ge=0, le=1, allow_inf_nan=False)
    quality: int = Field(default=85, ge=40, le=95)


def get_plan(service, plan_id):
    row = service.db.one(
        "SELECT payload FROM app_config WHERE key=?", ("thumbnail-plan:" + plan_id,)
    )
    if not row:
        raise FlowError(E.NOT_FOUND, "Thumbnail plan not found", 404)
    return ThumbnailPlan.model_validate_json(row["payload"])


def render(data, plan):
    return convert(
        data,
        plan.fit,
        size=(plan.width, plan.height),
        centering=(plan.center_x, plan.center_y),
        quality=plan.quality,
    )


def save_plan(service, plan_id, plan):
    service.db.execute(
        "INSERT OR REPLACE INTO app_config VALUES(?,?)",
        ("thumbnail-plan:" + plan_id, encode(plan.model_dump())),
    )