"""
modules/clipboard_intelligence.py - Phase 8 clipboard intelligence

Detects useful content types from clipboard history/current clipboard:
  - URLs
  - code snippets
  - email addresses
  - phone numbers
  - postal-ish addresses (best-effort heuristic)
"""

from __future__ import annotations

import json
import re
from dataclasses import dataclass
from pathlib import Path

from modules.clipboard_control import _read_text, HIST_PATH


URL_RE = re.compile(r"https?://[^\s]+", re.I)
EMAIL_RE = re.compile(r"\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b", re.I)
PHONE_RE = re.compile(r"(?:(?:\+?\d{1,3}[- ]?)?(?:\(?\d{3}\)?[- ]?)?\d{3}[- ]?\d{4,})")
CODE_HINTS = ("def ", "class ", "import ", "from ", "{", "}", "=>", "function ", "SELECT ", "CREATE ", "console.log")


@dataclass(frozen=True, slots=True)
class ClipInsight:
    kind: str
    preview: str


def _load_history(limit: int = 20) -> list[str]:
    if not HIST_PATH.exists():
        return []
    try:
        data = json.loads(HIST_PATH.read_text(encoding="utf-8"))
        if not isinstance(data, list):
            return []
        return [str(item.get("text") or "") for item in data[-limit:]]
    except Exception:
        return []


def _detect_one(text: str) -> list[ClipInsight]:
    t = (text or "").strip()
    if not t:
        return []
    out: list[ClipInsight] = []

    urls = URL_RE.findall(t)
    if urls:
        out.extend(ClipInsight("url", u[:120]) for u in urls[:3])

    mails = EMAIL_RE.findall(t)
    if mails:
        out.extend(ClipInsight("email", m[:120]) for m in mails[:3])

    phones = PHONE_RE.findall(t)
    if phones:
        out.extend(ClipInsight("phone", p[:40]) for p in phones[:3])

    if any(h in t for h in CODE_HINTS):
        out.append(ClipInsight("code", t[:120].replace("\n", " ")))

    # Rough address heuristic: number + street-ish word + comma/city-like structure
    if re.search(r"\b\d{1,5}\s+[A-Za-z0-9 .'-]{3,}\b(?:road|rd|street|st|avenue|ave|lane|ln|nagar|society|colony)\b", t, re.I):
        out.append(ClipInsight("address", t[:140].replace("\n", " ")))

    return out


def inspect_current() -> list[ClipInsight]:
    return _detect_one(_read_text() or "")


def inspect_history(limit: int = 20) -> list[ClipInsight]:
    seen = set()
    out: list[ClipInsight] = []
    for text in reversed(_load_history(limit)):
        for insight in _detect_one(text):
            key = (insight.kind, insight.preview)
            if key in seen:
                continue
            seen.add(key)
            out.append(insight)
    return out


def summary() -> str:
    items = inspect_current() or inspect_history(20)
    if not items:
        return "Clipboard intelligence: nothing structured detected."
    kinds = {}
    for item in items:
        kinds[item.kind] = kinds.get(item.kind, 0) + 1
    parts = [f"{k} x{v}" for k, v in sorted(kinds.items())]
    preview = items[0].preview
    return f"Clipboard intelligence: {', '.join(parts)}. Latest match: {preview}"