import logging
import os

from training_coach.models import ParsedCheckIn
from training_coach.parser_llama_cpp import (
    parse_check_in_with_llama_cpp,
    warm_up_llama_cpp_parser,
)
from training_coach.parser_ollama import parse_check_in_with_ollama
from training_coach.parser_runtime import parse_check_in_with_model


DEFAULT_LOCAL_BACKEND = "ollama"
DEFAULT_SPACE_BACKEND = "llama_cpp"
DEFAULT_OLLAMA_MODEL = "qwen3:1.7B"
logger = logging.getLogger(__name__)


def parser_backend() -> str:
    configured_backend = os.getenv("PARSER_BACKEND", "").strip().lower()
    if configured_backend:
        return configured_backend
    if os.getenv("SPACE_ID"):
        return DEFAULT_SPACE_BACKEND
    return DEFAULT_LOCAL_BACKEND


def warm_up_parser_backend() -> None:
    if parser_backend() == "llama_cpp":
        warm_up_llama_cpp_parser()


def parse_check_in_with_configured_backend(raw_text: str) -> ParsedCheckIn:
    backend = parser_backend()
    logger.info(
        "event=parser_start backend=%s text_chars=%s",
        backend,
        len(raw_text),
    )
    if backend == "ollama":
        parsed = parse_check_in_with_ollama(
            raw_text,
            model_name=os.getenv("OLLAMA_MODEL", DEFAULT_OLLAMA_MODEL),
        )
        logger.info(
            "event=parser_complete backend=%s missing_fields=%s follow_up_questions=%s",
            backend,
            len(parsed.missing_fields),
            len(parsed.follow_up_questions),
        )
        return parsed
    if backend == "llama_cpp":
        parsed = parse_check_in_with_llama_cpp(raw_text)
        logger.info(
            "event=parser_complete backend=%s missing_fields=%s follow_up_questions=%s",
            backend,
            len(parsed.missing_fields),
            len(parsed.follow_up_questions),
        )
        return parsed
    if backend == "transformers":
        parsed = parse_check_in_with_model(raw_text)
        logger.info(
            "event=parser_complete backend=%s missing_fields=%s follow_up_questions=%s",
            backend,
            len(parsed.missing_fields),
            len(parsed.follow_up_questions),
        )
        return parsed
    logger.error("event=parser_unsupported_backend backend=%s", backend)
    raise ValueError(
        "Unsupported PARSER_BACKEND. Use 'ollama', 'llama_cpp', or 'transformers'."
    )