#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import argparse
import re
import shutil
import subprocess
import sys
from pathlib import Path
from typing import Dict, List, Tuple

from rich.console import Console
from rich.panel import Panel
from rich.table import Table

console = Console()


def info(msg: str) -> None:
    console.print(f"• {msg}")


def ok(msg: str) -> None:
    console.print(f"[green]✔ {msg}[/]")


def warn(msg: str) -> None:
    console.print(f"[yellow]▲ {msg}[/]")


def die(msg: str, code: int = 1) -> "None":
    console.print(f"[bold red]✖ {msg}[/]")
    sys.exit(code)


def ensure_project_layout() -> None:
    missing: List[str] = []
    if not Path("robot_class.py").is_file():
        missing.append("robot_class.py")
    if not Path(".scripts").is_dir():
        missing.append(".scripts/")
    if missing:
        die("Non sei nella cartella giusta: mancano " + ", ".join(missing), code=9)
    # errore custom separato per robot_local.py (richiesta utente)
    if not Path("robot_local.py").is_file():
        die(
            "File personale 'robot_local.py' non trovato. "
            "Crealo (es. copia 'robot_local.example.py') e riprova.",
            code=5,
        )


def find_matching_paren(s: str, open_idx: int) -> int | None:
    """Trova la ')' che chiude la '(' a open_idx. Ignora stringhe e backslash."""
    depth = 0
    i = open_idx
    in_str = False
    quote: str | None = None
    while i < len(s):
        ch = s[i]
        if in_str:
            if ch == "\\":
                i += 2
                continue
            if ch == quote:
                in_str = False
            i += 1
            continue
        if ch in ("'", '"'):
            in_str = True
            quote = ch
            i += 1
            continue
        if ch == "(":
            depth += 1
        elif ch == ")":
            depth -= 1
            if depth == 0:
                return i
        i += 1
    return None


def parse_robots_py(robots_py: Path) -> Dict[str, str]:
    """
    Ritorna dict {var_name: hub_name} leggendo definizioni tipo:
      cbrobot = LazyRobot(..., name="cbhub", ...)
    Parsing robusto: trova inizio 'X = LazyRobot(' e bilancia parentesi.
    """
    if not robots_py.exists():
        die(f"File non trovato: {robots_py}", code=3)

    text = robots_py.read_text(encoding="utf-8")

    start_rx = re.compile(r"^\s*(?P<var>[A-Za-z_]\w*)\s*=\s*LazyRobot\s*\(", re.MULTILINE)
    name_rx = re.compile(r"\bname\s*=\s*(['\"])(?P<hub>.+?)\1", re.DOTALL)

    mapping: Dict[str, str] = {}

    for m in start_rx.finditer(text):
        var = m.group("var")
        open_idx = m.end() - 1  # '('
        close_idx = find_matching_paren(text, open_idx)
        if close_idx is None:
            continue
        body = text[open_idx + 1 : close_idx]
        m_name = name_rx.search(body)
        if not m_name:
            continue
        hub = m_name.group("hub")
        mapping[var] = hub

    if not mapping:
        die("Nessun robot trovato in robots.py (pattern LazyRobot(..., name=...)).", code=3)

    return mapping


def choose_robot(mapping: Dict[str, str], ident: str) -> Tuple[str, str]:
    """
    Accetta come 'ident' o il nome variabile (cbrobot) o il nome hub (cbhub).
    Ritorna (var_name, hub_name).
    """
    ident_lc = ident.strip().lower()
    # match per variabile
    for var, hub in mapping.items():
        if var.lower() == ident_lc:
            return var, hub
    # match per hub
    for var, hub in mapping.items():
        if hub.lower() == ident_lc:
            return var, hub
    # non trovato: mostra tabella e esci
    warn(f"Robot '{ident}' non trovato in robots.py.")
    table = Table(title="Robot conosciuti (da robots.py)")
    table.add_column("Variabile", style="cyan", no_wrap=True)
    table.add_column("Nome hub (BLE)", style="green")
    for var, hub in mapping.items():
        table.add_row(var, hub)
    console.print(table)
    sys.exit(4)


def rewrite_robot_local(robot_local: Path, var_name: str) -> None:
    header = (
        "# robot_local.py — generato automaticamente da pbd.py\n"
        "# Non commitare questo file: deve essere nel .gitignore.\n"
    )
    body = f"from robots import {var_name} as robot\n"
    try:
        robot_local.write_text(header + body, encoding="utf-8")
    except Exception as e:  # pragma: no cover (best-effort)
        die(f"Impossibile scrivere {robot_local}: {e}")


def run_pybricksdev(file_path: Path, hub_name: str) -> int:
    if not file_path.exists():
        die(f"File target da inviare non trovato: {file_path}", code=6)
    exe = shutil.which("pybricksdev")
    if exe is None:
        die("Comando 'pybricksdev' non trovato nel PATH. Installalo e riprova.", code=7)
    cmd = [exe, "run", "ble", str(file_path), "--name", hub_name]
    return subprocess.run(cmd, check=False).returncode


def build_parser() -> argparse.ArgumentParser:
    p = argparse.ArgumentParser(
        prog="pbd.py",
        description="Imposta robot_local.py e lancia: pybricksdev run ble <file> --name <hub>",
    )
    p.add_argument("nomerobot", help="Variabile di robots.py (es. 'cbrobot') oppure nome hub BLE (es. 'cbhub').")
    p.add_argument("nomefile", help="Percorso del file .py da eseguire sul hub.")
    return p


def main() -> None:
    parser = build_parser()
    args = parser.parse_args()

    ensure_project_layout()

    mapping = parse_robots_py(Path("robots.py"))
    var, hub = choose_robot(mapping, args.nomerobot)

    info(f"Selezionato robot: [cyan]{var}[/] → hub BLE: [green]{hub}[/]")

    rewrite_robot_local(Path("robot_local.py"), var)
    ok(f"Aggiornato robot_local.py con 'from robots import {var} as robot'")

    info(f"Eseguo: pybricksdev run ble {args.nomefile} --name {hub}")
    rc = run_pybricksdev(Path(args.nomefile), hub)

    if rc == 0:
        ok("pybricksdev completato con successo.")
    else:
        die(f"pybricksdev terminato con exit code {rc}.", code=rc)


if __name__ == "__main__":
    main()