from __future__ import annotations

import re
from typing import Literal

from pydantic import BaseModel, ConfigDict, Field, field_validator

_REVISION = re.compile(r"^[0-9a-f]{40}$")
_DIGEST = re.compile(r"^sha256:[0-9a-f]{64}$")


class ForgeBootstrapPreflightV1(BaseModel):
    """Fixed read-only input for Forge production bootstrap readiness."""

    model_config = ConfigDict(extra="forbid", strict=True)

    api_version: Literal["itworx.forge-bootstrap-preflight/v1"]
    revision: str = Field(min_length=40, max_length=40)
    workspace_image_digest: str = Field(min_length=71, max_length=71)
    frontdoor_image_digest: str = Field(min_length=71, max_length=71)

    @field_validator("revision")
    @classmethod
    def full_lowercase_revision(cls, value: str) -> str:
        if not _REVISION.fullmatch(value):
            raise ValueError("revision must be a full lowercase Git SHA")
        return value

    @field_validator("workspace_image_digest", "frontdoor_image_digest")
    @classmethod
    def immutable_oci_digest(cls, value: str) -> str:
        if not _DIGEST.fullmatch(value):
            raise ValueError("image digest must be a lowercase sha256 OCI digest")
        return value