"""
Real Tool Executor
==================
Actually installs packages and executes tool code in a real Python subprocess.
No simulation — real results only.
"""
import os
import sys
import json
import subprocess
import hashlib
import tempfile
import threading
from pathlib import Path

# Persistent package cache dir (survives restarts within same container session)
PKG_DIR = Path(os.environ.get("HOME", "/home/user")) / ".praison_pkgs"
PKG_DIR.mkdir(parents=True, exist_ok=True)

_install_lock = threading.Lock()
_installed_cache: set = set()  # packages confirmed installed this session


# ── Pre-installed packages that are always available ──────────────────────────
PREINSTALLED = {
    "requests", "json", "os", "sys", "re", "math", "datetime", "time",
    "urllib", "urllib3", "base64", "hashlib", "pathlib", "collections",
    "itertools", "functools", "string", "random", "uuid", "tempfile",
    "subprocess", "threading", "asyncio", "io", "csv", "html", "http",
    "duckduckgo_search", "duckduckgo-search",
    "bs4", "beautifulsoup4", "httpx", "gtts",
}

# ── Package name normalisation (import name -> pip name) ─────────────────────
PKG_ALIASES = {
    "bs4": "beautifulsoup4",
    "duckduckgo_search": "duckduckgo-search",
    "PIL": "Pillow",
    "cv2": "opencv-python-headless",
    "sklearn": "scikit-learn",
    "yaml": "pyyaml",
    "dotenv": "python-dotenv",
    "telegram": "python-telegram-bot",
    "wikipedia": "wikipedia-api",
    "googlesearch": "googlesearch-python",
    "forex_python": "forex-python",
    "yfinance": "yfinance",
    "pandas": "pandas",
    "numpy": "numpy",
    "matplotlib": "matplotlib",
}


def pip_install(packages: list[str]) -> tuple[bool, str]:
    """Install one or more packages. Returns (success, message)."""
    to_install = []
    for pkg in packages:
        norm = pkg.strip().lower().replace("-", "_")
        pip_name = PKG_ALIASES.get(pkg, PKG_ALIASES.get(norm, pkg))
        if pip_name.lower().replace("-","_") not in _installed_cache:
            to_install.append(pip_name)

    if not to_install:
        return True, "All packages already installed"

    with _install_lock:
        cmd = [sys.executable, "-m", "pip", "install", "--quiet",
               "--target", str(PKG_DIR)] + to_install
        result = subprocess.run(cmd, capture_output=True, text=True, timeout=120)
        if result.returncode == 0:
            for p in to_install:
                _installed_cache.add(p.lower().replace("-","_"))
            return True, f"Installed: {', '.join(to_install)}"
        else:
            return False, result.stderr[-500:]


def build_exec_wrapper(tool_code: str, function_name: str, call_args: dict) -> str:
    """Wrap tool code in a self-contained script that prints JSON result."""
    pkg_dir_str = str(PKG_DIR)
    args_repr = json.dumps(call_args)
    return f'''
import sys, json
sys.path.insert(0, {repr(pkg_dir_str)})

# ── Tool implementation ──
{tool_code}

# ── Execute and report ──
try:
    import inspect
    fn = {function_name}
    sig = inspect.signature(fn)
    call_kwargs = json.loads({repr(args_repr)})
    # If single positional string arg, handle gracefully
    params = list(sig.parameters.keys())
    if params and not call_kwargs:
        call_kwargs = {{params[0]: ""}}
    result = fn(**call_kwargs)
    print(json.dumps({{"ok": True, "result": str(result)}}))
except Exception as e:
    import traceback
    print(json.dumps({{"ok": False, "error": str(e), "trace": traceback.format_exc()[-300:]}}))
'''


def execute_tool(
    tool_code: str,
    function_name: str,
    call_args: dict,
    required_packages: list[str] | None = None,
    timeout: int = 30,
) -> dict:
    """
    Actually execute a tool's Python code.
    Returns {"ok": bool, "result": str, "install_msg": str, "error": str}
    """
    install_msg = ""

    # Install required packages first
    if required_packages:
        ok, msg = pip_install(required_packages)
        install_msg = msg
        if not ok:
            return {"ok": False, "result": "", "install_msg": install_msg,
                    "error": f"Package install failed: {msg}"}

    # Write to temp file and execute
    script = build_exec_wrapper(tool_code, function_name, call_args)
    with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False, encoding="utf-8") as f:
        f.write(script)
        tmp_path = f.name

    try:
        env = os.environ.copy()
        env["PYTHONPATH"] = str(PKG_DIR) + os.pathsep + env.get("PYTHONPATH", "")
        proc = subprocess.run(
            [sys.executable, tmp_path],
            capture_output=True, text=True, timeout=timeout, env=env
        )
        raw_out = proc.stdout.strip()
        raw_err = proc.stderr.strip()

        if raw_out:
            try:
                data = json.loads(raw_out.split("\n")[-1])
                data["install_msg"] = install_msg
                data["stderr"] = raw_err[-300:] if raw_err else ""
                return data
            except json.JSONDecodeError:
                return {"ok": True, "result": raw_out[:2000], "install_msg": install_msg, "stderr": raw_err}
        else:
            return {"ok": False, "result": "", "install_msg": install_msg,
                    "error": raw_err[:500] or "No output produced"}

    except subprocess.TimeoutExpired:
        return {"ok": False, "result": "", "install_msg": install_msg,
                "error": f"Tool timed out after {timeout}s"}
    except Exception as e:
        return {"ok": False, "result": "", "install_msg": install_msg, "error": str(e)}
    finally:
        try:
            os.unlink(tmp_path)
        except Exception:
            pass


# ── Built-in real tools (always work, no install needed) ─────────────────────

BUILTIN_TOOL_IMPLEMENTATIONS = {
    "get_current_datetime": {
        "packages": [],
        "code": """
import datetime
def get_current_datetime() -> str:
    now = datetime.datetime.now()
    utc = datetime.datetime.utcnow()
    return (f"Local datetime: {now.strftime('%A, %B %d, %Y at %I:%M:%S %p')}\\n"
            f"UTC datetime:   {utc.strftime('%Y-%m-%d %H:%M:%S')} UTC\\n"
            f"Unix timestamp: {int(now.timestamp())}\\n"
            f"Timezone:       {datetime.datetime.now().astimezone().tzname()}")
""",
        "args": {},
    },
    "search_web": {
        "packages": ["duckduckgo-search"],
        "code": """
import sys
sys.path.insert(0, '__PKG_DIR__')
def search_web(query: str, max_results: int = 6) -> str:
    from duckduckgo_search import DDGS
    results = []
    with DDGS() as ddgs:
        for r in ddgs.text(query, max_results=max_results):
            results.append(f"Title: {r['title']}\\nURL: {r['href']}\\nSummary: {r['body']}\\n")
    return '\\n---\\n'.join(results) if results else 'No results found'
""".replace("__PKG_DIR__", str(PKG_DIR)),
        "args": {"query": ""},
    },
    "fetch_webpage": {
        "packages": ["requests", "beautifulsoup4"],
        "code": """
import sys
sys.path.insert(0, '__PKG_DIR__')
def fetch_webpage(url: str) -> str:
    import requests
    from bs4 import BeautifulSoup
    try:
        r = requests.get(url, timeout=10, headers={'User-Agent': 'Mozilla/5.0'})
        soup = BeautifulSoup(r.text, 'html.parser')
        for tag in soup(['script','style','nav','footer','header']):
            tag.decompose()
        text = soup.get_text(separator='\\n', strip=True)
        lines = [l for l in text.splitlines() if len(l.strip()) > 20]
        return '\\n'.join(lines[:150])
    except Exception as e:
        return f'Error fetching {url}: {e}'
""".replace("__PKG_DIR__", str(PKG_DIR)),
        "args": {"url": ""},
    },
    "run_python_code": {
        "packages": [],
        "code": """
import subprocess, sys, tempfile, os
def run_python_code(code: str) -> str:
    with tempfile.NamedTemporaryFile(mode='w', suffix='.py', delete=False) as f:
        f.write(code)
        tmp = f.name
    try:
        result = subprocess.run([sys.executable, tmp], capture_output=True, text=True, timeout=20)
        out = (result.stdout + result.stderr).strip()
        return out[:3000] if out else '(no output)'
    except subprocess.TimeoutExpired:
        return 'Error: timed out after 20s'
    finally:
        try: os.unlink(tmp)
        except: pass
""",
        "args": {"code": ""},
    },
    "create_voice": {
        "packages": ["gtts"],
        "code": """
import sys, base64, io
sys.path.insert(0, '__PKG_DIR__')
def create_voice(text: str, lang: str = 'en') -> str:
    from gtts import gTTS
    tts = gTTS(text=text[:2000], lang=lang, slow=False)
    buf = io.BytesIO()
    tts.write_to_fp(buf)
    buf.seek(0)
    b64 = base64.b64encode(buf.read()).decode('utf-8')
    return 'AUDIO_B64:' + b64
""".replace("__PKG_DIR__", str(PKG_DIR)),
        "args": {"text": ""},
    },
    "calculate": {
        "packages": [],
        "code": """
import math
def calculate(expression: str) -> str:
    safe_ns = {k: getattr(math, k) for k in dir(math) if not k.startswith('_')}
    safe_ns['__builtins__'] = {}
    try:
        result = eval(expression.replace('^','**'), safe_ns)
        return f'{expression} = {result}'
    except Exception as e:
        return f'Error: {e}'
""",
        "args": {"expression": ""},
    },
}


def run_builtin_tool(name: str, user_message: str = "") -> dict:
    """Execute a real built-in tool."""
    spec = BUILTIN_TOOL_IMPLEMENTATIONS.get(name)
    if not spec:
        return {"ok": False, "result": "", "error": f"Unknown built-in: {name}"}
    args = dict(spec["args"])
    # Fill the first string arg with user_message if empty
    for k in args:
        if args[k] == "" and user_message:
            args[k] = user_message
            break
    return execute_tool(spec["code"], name, args, spec["packages"], timeout=45)