#!/usr/bin/env python3
"""
rtorrent_cli.py - proste CLI do masowego zarządzania rTorrent przez XML-RPC/SCGI.

Domyślny endpoint:
  scgi://127.0.0.1:5000

Przykłady:
  python3 rtorrent_cli.py ping
  python3 rtorrent_cli.py list
  python3 rtorrent_cli.py list --only-stopped --only-complete
  python3 rtorrent_cli.py show HASH
  python3 rtorrent_cli.py start HASH
  python3 rtorrent_cli.py bulk-start --only-stopped --only-complete
  python3 rtorrent_cli.py bulk-stop --name-regex "ubuntu|debian"
  python3 rtorrent_cli.py bulk-announce --only-active
  python3 rtorrent_cli.py bulk-check-hash --only-stopped --name-regex "movie"
  python3 rtorrent_cli.py dump-methods
"""

from __future__ import annotations

import argparse
import json
import re
import socket
import sys
import xmlrpc.client
from dataclasses import dataclass, asdict
from typing import Any, Iterable
from urllib.parse import urlparse


DEFAULT_URL = "scgi://127.0.0.1:5000"


# ----------------------------
# SCGI XML-RPC transport
# ----------------------------

class SCGITransport(xmlrpc.client.Transport):
    def __init__(self, host: str, port: int, timeout: int = 15):
        super().__init__()
        self.host = host
        self.port = port
        self.timeout = timeout

    def request(self, host: str, handler: str, request_body: bytes, verbose: bool = False):
        body = request_body.encode("utf-8") if isinstance(request_body, str) else request_body

        headers = {
            "CONTENT_LENGTH": str(len(body)),
            "SCGI": "1",
            "REQUEST_METHOD": "POST",
            "REQUEST_URI": handler or "/RPC2",
        }

        header_bytes = b""
        for key, value in headers.items():
            header_bytes += key.encode("utf-8") + b"\x00" + value.encode("utf-8") + b"\x00"

        packet = str(len(header_bytes)).encode("ascii") + b":" + header_bytes + b"," + body

        with socket.create_connection((self.host, self.port), timeout=self.timeout) as sock:
            sock.sendall(packet)
            response = b""
            while True:
                chunk = sock.recv(65536)
                if not chunk:
                    break
                response += chunk

        # rTorrent przez SCGI zwykle zwraca same XML body, ale niektóre proxy mogą dodać nagłówki HTTP.
        if b"\r\n\r\n" in response:
            response = response.split(b"\r\n\r\n", 1)[1]

        return self.parse_response_bytes(response)

    def parse_response_bytes(self, data: bytes):
        p, u = self.getparser()
        p.feed(data)
        p.close()
        return u.close()


def make_rpc_client(url: str, timeout: int):
    parsed = urlparse(url)

    if parsed.scheme == "scgi":
        if not parsed.hostname:
            raise ValueError("SCGI URL musi mieć host, np. scgi://127.0.0.1:5000")
        transport = SCGITransport(parsed.hostname, parsed.port or 5000, timeout=timeout)
        return xmlrpc.client.ServerProxy(
            "http://rtorrent/RPC2",
            transport=transport,
            allow_none=True,
        )

    return xmlrpc.client.ServerProxy(url, allow_none=True)


# ----------------------------
# Helpers
# ----------------------------

@dataclass
class Torrent:
    hash: str
    name: str
    state: int
    active: int
    complete: int
    size_bytes: int
    completed_bytes: int
    ratio: int
    down_rate: int
    up_rate: int
    message: str

    @property
    def stopped(self) -> bool:
        return self.state == 0

    @property
    def started_or_paused(self) -> bool:
        return self.state == 1

    @property
    def is_active(self) -> bool:
        return self.active == 1

    @property
    def is_complete(self) -> bool:
        return self.complete == 1


def rpc_error(exc: Exception, context: dict[str, Any] | None = None) -> dict[str, Any]:
    payload = {
        "ok": False,
        "error_type": exc.__class__.__name__,
        "error": str(exc),
    }
    if context:
        payload["context"] = context
    return payload


def print_json(data: Any) -> None:
    print(json.dumps(data, ensure_ascii=False, indent=2, sort_keys=False))


def call_method(rpc, method: str, *args):
    return getattr(rpc, method)(*args)


def safe_call(rpc, method: str, *args, context: dict[str, Any] | None = None):
    try:
        return True, call_method(rpc, method, *args)
    except Exception as exc:
        return False, rpc_error(exc, context=context or {"method": method, "args": args})


def human_bytes(num: int) -> str:
    value = float(num)
    for unit in ["B", "KiB", "MiB", "GiB", "TiB", "PiB"]:
        if abs(value) < 1024:
            return f"{value:.1f} {unit}"
        value /= 1024
    return f"{value:.1f} EiB"


# ----------------------------
# rTorrent API
# ----------------------------

def get_torrent_hashes(rpc, view: str = "main") -> list[str]:
    ok, result = safe_call(rpc, "d.multicall2", "", view, "d.hash=")
    if not ok:
        raise RuntimeError(json.dumps(result, ensure_ascii=False))

    hashes: list[str] = []
    for row in result:
        if isinstance(row, list) and row:
            hashes.append(str(row[0]))
        elif isinstance(row, str):
            hashes.append(row)
    return hashes


def list_torrents(rpc, view: str = "main") -> list[Torrent]:
    methods = [
        "d.hash=",
        "d.name=",
        "d.state=",
        "d.is_active=",
        "d.complete=",
        "d.size_bytes=",
        "d.completed_bytes=",
        "d.ratio=",
        "d.down.rate=",
        "d.up.rate=",
        "d.message=",
    ]

    ok, result = safe_call(rpc, "d.multicall2", "", view, *methods)
    if not ok:
        raise RuntimeError(json.dumps(result, ensure_ascii=False))

    torrents: list[Torrent] = []
    for row in result:
        torrents.append(Torrent(
            hash=str(row[0]),
            name=str(row[1]),
            state=int(row[2]),
            active=int(row[3]),
            complete=int(row[4]),
            size_bytes=int(row[5]),
            completed_bytes=int(row[6]),
            ratio=int(row[7]),
            down_rate=int(row[8]),
            up_rate=int(row[9]),
            message=str(row[10]),
        ))
    return torrents


def get_torrent(rpc, hash_: str) -> Torrent:
    torrents = list_torrents(rpc)
    for torrent in torrents:
        if torrent.hash.lower() == hash_.lower():
            return torrent
    raise KeyError(f"Nie znaleziono torrenta: {hash_}")


def filter_torrents(torrents: Iterable[Torrent], args) -> list[Torrent]:
    result = list(torrents)

    if getattr(args, "only_stopped", False):
        result = [t for t in result if t.stopped]

    if getattr(args, "only_started", False):
        result = [t for t in result if t.started_or_paused]

    if getattr(args, "only_active", False):
        result = [t for t in result if t.is_active]

    if getattr(args, "only_complete", False):
        result = [t for t in result if t.is_complete]

    if getattr(args, "only_incomplete", False):
        result = [t for t in result if not t.is_complete]

    if getattr(args, "name_regex", None):
        pattern = re.compile(args.name_regex, re.IGNORECASE)
        result = [t for t in result if pattern.search(t.name)]

    if getattr(args, "hash_regex", None):
        pattern = re.compile(args.hash_regex, re.IGNORECASE)
        result = [t for t in result if pattern.search(t.hash)]

    return result


def torrent_to_dict(t: Torrent) -> dict[str, Any]:
    data = asdict(t)
    data["size"] = human_bytes(t.size_bytes)
    data["completed"] = human_bytes(t.completed_bytes)
    data["ratio_float"] = round(t.ratio / 1000, 3)
    return data


# ----------------------------
# Commands
# ----------------------------

def cmd_ping(rpc, args) -> int:
    ok, result = safe_call(rpc, "system.client_version")
    if ok:
        print_json({"ok": True, "client_version": result})
        return 0

    # fallback dla starszych buildów
    ok, result = safe_call(rpc, "system.listMethods")
    print_json({"ok": ok, "result": result})
    return 0 if ok else 1


def cmd_list(rpc, args) -> int:
    try:
        torrents = filter_torrents(list_torrents(rpc, args.view), args)
        print_json({
            "ok": True,
            "count": len(torrents),
            "torrents": [torrent_to_dict(t) for t in torrents],
        })
        return 0
    except Exception as exc:
        print_json(rpc_error(exc))
        return 1


def cmd_show(rpc, args) -> int:
    try:
        t = get_torrent(rpc, args.hash)
        print_json({"ok": True, "torrent": torrent_to_dict(t)})
        return 0
    except Exception as exc:
        print_json(rpc_error(exc, {"hash": args.hash}))
        return 1


ACTION_METHODS = {
    "start": "d.start",
    "stop": "d.stop",
    "open": "d.open",
    "close": "d.close",
    "check-hash": "d.check_hash",
    "announce": "d.tracker_announce",
}


def cmd_single_action(rpc, args) -> int:
    method = ACTION_METHODS[args.command]
    ok, result = safe_call(rpc, method, args.hash, context={"hash": args.hash, "method": method})
    print_json({
        "ok": ok,
        "action": args.command,
        "hash": args.hash,
        "result": result,
    })
    return 0 if ok else 1


BULK_ACTION_METHODS = {
    "bulk-start": "d.start",
    "bulk-stop": "d.stop",
    "bulk-open": "d.open",
    "bulk-close": "d.close",
    "bulk-check-hash": "d.check_hash",
    "bulk-announce": "d.tracker_announce",
}


def cmd_bulk_action(rpc, args) -> int:
    try:
        torrents = filter_torrents(list_torrents(rpc, args.view), args)
    except Exception as exc:
        print_json(rpc_error(exc))
        return 1

    method = BULK_ACTION_METHODS[args.command]
    results = []

    if args.dry_run:
        print_json({
            "ok": True,
            "dry_run": True,
            "action": args.command,
            "method": method,
            "count": len(torrents),
            "targets": [torrent_to_dict(t) for t in torrents],
        })
        return 0

    failed = 0
    for t in torrents:
        ok, result = safe_call(rpc, method, t.hash, context={"hash": t.hash, "name": t.name, "method": method})
        if not ok:
            failed += 1
        results.append({
            "ok": ok,
            "hash": t.hash,
            "name": t.name,
            "result": result,
        })

    print_json({
        "ok": failed == 0,
        "action": args.command,
        "method": method,
        "count": len(torrents),
        "failed": failed,
        "results": results,
    })
    return 0 if failed == 0 else 2


def cmd_bulk_start_complete(rpc, args) -> int:
    args.only_complete = True
    args.command = "bulk-start"
    return cmd_bulk_action(rpc, args)


def cmd_dump_methods(rpc, args) -> int:
    ok, result = safe_call(rpc, "system.listMethods")
    print_json({"ok": ok, "methods": result if ok else None, "error": None if ok else result})
    return 0 if ok else 1


# ----------------------------
# CLI
# ----------------------------

def add_filters(parser: argparse.ArgumentParser) -> None:
    parser.add_argument("--view", default="main", help="Widok rTorrent, domyślnie: main")
    parser.add_argument("--only-stopped", action="store_true", help="Tylko state=0")
    parser.add_argument("--only-started", action="store_true", help="Tylko state=1")
    parser.add_argument("--only-active", action="store_true", help="Tylko is_active=1")
    parser.add_argument("--only-complete", action="store_true", help="Tylko complete=1")
    parser.add_argument("--only-incomplete", action="store_true", help="Tylko complete=0")
    parser.add_argument("--name-regex", help="Filtr regex po nazwie")
    parser.add_argument("--hash-regex", help="Filtr regex po hashu")


def build_parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(
        description="CLI do diagnozy i masowego sterowania rTorrent przez XML-RPC/SCGI."
    )
    parser.add_argument(
        "--url",
        default=DEFAULT_URL,
        help=f"Endpoint RPC, domyślnie: {DEFAULT_URL}",
    )
    parser.add_argument("--timeout", type=int, default=15, help="Timeout połączenia w sekundach")

    sub = parser.add_subparsers(dest="command", required=True)

    sub.add_parser("ping", help="Test połączenia")

    p = sub.add_parser("list", help="Lista torrentów")
    add_filters(p)

    p = sub.add_parser("show", help="Szczegóły torrenta")
    p.add_argument("hash")

    for name in ACTION_METHODS:
        p = sub.add_parser(name, help=f"Wykonaj {name} na jednym torrencie")
        p.add_argument("hash")

    for name in BULK_ACTION_METHODS:
        p = sub.add_parser(name, help=f"Masowo wykonaj {name}")
        add_filters(p)
        p.add_argument("--dry-run", action="store_true", help="Pokaż cele bez wykonywania akcji")

    p = sub.add_parser("bulk-start-complete", help="Wystartuj kompletne torrenty")
    add_filters(p)
    p.add_argument("--dry-run", action="store_true", help="Pokaż cele bez wykonywania akcji")

    sub.add_parser("dump-methods", help="Wypisz dostępne metody RPC")

    return parser


def main() -> int:
    args = build_parser().parse_args()

    try:
        rpc = make_rpc_client(args.url, args.timeout)
    except Exception as exc:
        print_json(rpc_error(exc, {"url": args.url}))
        return 1

    if args.command == "ping":
        return cmd_ping(rpc, args)

    if args.command == "list":
        return cmd_list(rpc, args)

    if args.command == "show":
        return cmd_show(rpc, args)

    if args.command in ACTION_METHODS:
        return cmd_single_action(rpc, args)

    if args.command in BULK_ACTION_METHODS:
        return cmd_bulk_action(rpc, args)

    if args.command == "bulk-start-complete":
        return cmd_bulk_start_complete(rpc, args)

    if args.command == "dump-methods":
        return cmd_dump_methods(rpc, args)

    print_json({"ok": False, "error": f"Nieznana komenda: {args.command}"})
    return 1


if __name__ == "__main__":
    sys.exit(main())