from ai_agent.retriever.software_doc import SoftwareDoc
from typing import Optional, List, Any
import re
import os

# Constants for affirmative detection
_MULTI_WORD_AFFIRMATIVES = ["go ahead", "do it", "run it", "sounds good", "looks good"]

_SINGLE_WORD_AFFIRMATIVES = [
    "yes",
    "y",
    "yeah",
    "yep",
    "yup",
    "sure",
    "ok",
    "okay",
    "fine",
    "alright",
    "right",
    "correct",
    "affirmative",
]

_EMOJI_AFFIRMATIVES = ["👍", "✅", "✓"]

_NEGATION_WORDS = {"no", "not", "don't", "dont", "never", "nothing"}

# Thresholds for context-based detection
_PHRASE_LENGTH_MULTIPLIER = 3  # Max text length = phrase length * multiplier
_SHORT_MESSAGE_THRESHOLD = 30  # Character threshold for "short message"

# Pre-compile regex pattern for negation detection
_NEGATION_PATTERN = re.compile(
    r"\b(" + "|".join(re.escape(w) for w in _NEGATION_WORDS) + r")\b"
)


def _best_runnable_link(doc: SoftwareDoc) -> Optional[str]:
    """Return the most user-friendly runnable link.

    Preference order:
      1. Hugging Face Space (hf.space or huggingface.co/spaces)
      2. Other interactive demo hosts (gradio.live, replicate.run, etc.)
      3. Executable notebook links (.ipynb, colab)
      4. Fallback to first runnable example / notebook URL (GitHub last)
    Explicit `priority` values in catalog still respected (lower is better), but
    host preference can override large default values.
    """

    def base_priority(item) -> float:
        if isinstance(item, dict) and "priority" in item:
            try:
                return float(item["priority"])
            except Exception:
                pass
        return 100.0  # neutral base

    def extract_url(item) -> Optional[str]:
        url = item.get("url")
        if isinstance(url, list) and url:
            return url[0].strip()
        elif isinstance(url, str):
            return url.strip()
        return None

    def host_bonus(u: str) -> float:
        lu = u.lower()
        if "huggingface.co/spaces" in lu or lu.startswith("https://hf.space"):
            return -60.0
        if "gradio.live" in lu:
            return -40.0
        if "replicate.run" in lu or "replicate.com" in lu:
            return -30.0
        if lu.endswith(".ipynb") or "colab.research.google.com" in lu:
            return -10.0
        if "github.com" in lu:
            return +10.0  # de-prioritize plain GitHub vs real demos
        return 0.0

    collected = []
    for items in (
        getattr(doc, "runnable_example", None) or [],
        getattr(doc, "has_executable_notebook", None) or [],
    ):
        for it in items:
            url = extract_url(it)
            if not url:
                continue
            pr = base_priority(it) + host_bonus(url)
            collected.append((pr, url))

    if not collected:
        return None
    collected.sort(key=lambda x: x[0])
    return collected[0][1]


def _coerce_files_to_paths(files: List[Any]) -> List[str]:
    """Convert Gradio file objects to paths."""
    if not files:
        return []

    paths = []
    for f in files:
        if isinstance(f, str):
            paths.append(f)
        elif isinstance(f, dict):
            p = f.get("name") or f.get("path")
            if p:
                paths.append(p)
        elif hasattr(f, "name"):
            paths.append(f.name)

    # De-duplicate
    seen = set()
    deduped = []
    for p in paths:
        if p not in seen:
            seen.add(p)
            deduped.append(p)

    return deduped


def _is_affirmative(text: str) -> bool:
    """Check if user message is affirmative (yes, ok, sure, etc.).

    Uses word boundary matching and context checking to avoid false positives.
    """
    text_lower = text.lower().strip()

    if not text_lower:
        return False

    # Check emojis
    for emoji in _EMOJI_AFFIRMATIVES:
        if emoji in text:
            return True

    # With negation, only match if entire message is exactly one affirmative word
    has_negation = _NEGATION_PATTERN.search(text_lower) is not None
    if has_negation:
        stripped = re.sub(r"[.,!?\s]+$", "", text_lower)
        if stripped in _SINGLE_WORD_AFFIRMATIVES:
            return True
        return False

    # Check multi-word phrases (reject if text is much longer than phrase)
    for phrase in _MULTI_WORD_AFFIRMATIVES:
        if re.search(r"\b" + re.escape(phrase) + r"\b", text_lower):
            if len(text_lower) <= len(phrase) * _PHRASE_LENGTH_MULTIPLIER:
                return True

    # Check single words (reject if message is long)
    for word in _SINGLE_WORD_AFFIRMATIVES:
        if re.search(r"\b" + re.escape(word) + r"\b", text_lower):
            if len(text_lower) <= _SHORT_MESSAGE_THRESHOLD:
                return True

    return False

def _env_flag(name: str, default: bool = False) -> bool:
    """Parse boolean env vars robustly."""
    raw = os.getenv(name)
    if raw is None:
        return default
    val = raw.split("#", 1)[0].strip().lower()
    if not val:
        return default
    return val in {"1", "true", "yes", "on"}