from __future__ import annotations
import os
from dataclasses import dataclass
from pathlib import Path


def _env(name: str, default: str = "") -> str:
    return os.environ.get(name, default)


def _resolve_models_yaml() -> str:
    if env := os.environ.get("MODELS_YAML"):
        return env
    here = Path(__file__).resolve().parent  # app/
    candidates = [
        here.parent / "models.yaml",        # image/models.yaml (Docker)
        here.parent.parent / "models.yaml", # <repo>/models.yaml (dev)
        Path("/app/models.yaml"),           # explicit container path
    ]
    for p in candidates:
        if p.exists():
            return str(p)
    return str(candidates[0])  # let load fail with a clear path


@dataclass(frozen=True)
class Settings:
    spark1_host: str
    spark1_user: str
    spark2_host: str
    spark2_user: str
    parakeet_host: str
    parakeet_user: str
    parakeet_container: str
    kokoro_host: str
    kokoro_user: str
    kokoro_container: str
    embed_host: str
    embed_user: str
    embed_container: str
    qdrant_host: str
    qdrant_user: str
    qdrant_container: str
    qdrant_collection: str
    matrix_bridge_host: str
    matrix_bridge_user: str
    matrix_bridge_container: str
    matrix_bridge_dir: str
    matrix_bridge_branch: str
    redaction_map_db: str
    redaction_map_ttl: int
    ssh_key_path: str
    ssh_known_hosts: str
    models_yaml: str
    vllm_port: int
    parakeet_port: int
    kokoro_port: int
    embed_port: int
    qdrant_port: int
    bind_port: int
    open_webui_url: str
    ngc_api_key: str

    @classmethod
    def from_env(cls) -> "Settings":
        spark2_host = _env("SPARK2_HOST")
        spark2_user = _env("SPARK2_USER")
        # Parakeet (STT) and Kokoro (TTS) default to Spark 2 unless overridden.
        return cls(
            spark1_host=_env("SPARK1_HOST"),
            spark1_user=_env("SPARK1_USER"),
            spark2_host=spark2_host,
            spark2_user=spark2_user,
            parakeet_host=_env("PARAKEET_HOST") or spark2_host,
            parakeet_user=_env("PARAKEET_USER") or spark2_user,
            parakeet_container=_env("PARAKEET_CONTAINER") or "parakeet-asr",
            kokoro_host=_env("KOKORO_HOST") or spark2_host,
            kokoro_user=_env("KOKORO_USER") or spark2_user,
            kokoro_container=_env("KOKORO_CONTAINER") or "kokoro-tts",
            # Embeddings (spark-embed: bge-m3 dense + reranker) and Qdrant
            # (vector storage) default to Spark 2 unless overridden.
            embed_host=_env("EMBED_HOST") or spark2_host,
            embed_user=_env("EMBED_USER") or spark2_user,
            embed_container=_env("EMBED_CONTAINER") or "spark-embed",
            qdrant_host=_env("QDRANT_HOST") or spark2_host,
            qdrant_user=_env("QDRANT_USER") or spark2_user,
            qdrant_container=_env("QDRANT_CONTAINER") or "qdrant",
            qdrant_collection=_env("QDRANT_COLLECTION", ""),
            # matrix-bridge bot container, driven as its own SSH user (the owner
            # of the ~/matrix-bridge git clone) so git/docker run unprivileged.
            # The user is BLANK by default and set via the "Configure Sparks"
            # action; leaving it blank reports the service as unconfigured, which
            # hides the tile. That keeps the shared package portable — a
            # deployment without the bot never shows a stray tile or a hardcoded
            # username. Host defaults to Spark 2 (same box); container/dir/branch
            # are sensible defaults. All are env-overridable.
            matrix_bridge_host=_env("MATRIX_BRIDGE_HOST") or spark2_host,
            matrix_bridge_user=_env("MATRIX_BRIDGE_USER"),
            matrix_bridge_container=_env("MATRIX_BRIDGE_CONTAINER") or "matrix-bridge",
            matrix_bridge_dir=_env("MATRIX_BRIDGE_DIR") or "~/matrix-bridge",
            matrix_bridge_branch=_env("MATRIX_BRIDGE_BRANCH") or "master",
            # Redaction gateway pseudonym-map store (server-held de-anon key).
            redaction_map_db=_env("REDACTION_MAP_DB", "/data/redaction_maps.db"),
            redaction_map_ttl=int(_env("REDACTION_MAP_TTL", "7200")),
            ssh_key_path=_env("SSH_KEY_PATH"),
            ssh_known_hosts=_env("SSH_KNOWN_HOSTS"),
            models_yaml=_resolve_models_yaml(),
            vllm_port=int(_env("VLLM_PORT", "8888")),
            parakeet_port=int(_env("PARAKEET_PORT", "8000")),
            kokoro_port=int(_env("KOKORO_PORT", "8880")),
            embed_port=int(_env("EMBED_PORT", "8088")),
            qdrant_port=int(_env("QDRANT_PORT", "6333")),
            bind_port=int(_env("BIND_PORT", "9999")),
            open_webui_url=_env("OPEN_WEBUI_URL", ""),
            ngc_api_key=_env("NGC_API_KEY", ""),
        )

    @property
    def configured(self) -> bool:
        return bool(self.spark1_host)