from __future__ import annotations

from typing import Any, Dict, Sequence
import json

from . import register
from helper import hydrus as hydrus_wrapper
from ._shared import Cmdlet, CmdletArg, normalize_hash
from helper.logger import log

CMDLET = Cmdlet(
    name="delete-url",
    summary="Remove a URL association from a Hydrus file.",
    usage="delete-url [-hash <sha256>] <url>",
    args=[
        CmdletArg("-hash", description="Override the Hydrus file hash (SHA256) to target instead of the selected result."),
        CmdletArg("<url>", required=True, description="The URL to remove from the file."),
    ],
    details=[
        "- Removes the URL from the Hydrus file's known URL list.",
    ],
)


def _parse_hash_and_rest(args: Sequence[str]) -> tuple[str | None, list[str]]:
    override_hash: str | None = None
    rest: list[str] = []
    i = 0
    while i < len(args):
        a = args[i]
        low = str(a).lower()
        if low in {"-hash", "--hash", "hash"} and i + 1 < len(args):
            override_hash = str(args[i + 1]).strip()
            i += 2
            continue
        rest.append(a)
        i += 1
    return override_hash, rest


@register(["del-url", "delete-url", "delete_url"])  # aliases
def delete(result: Any, args: Sequence[str], config: Dict[str, Any]) -> int:
    # Help
    try:
        if any(str(a).lower() in {"-?", "/?", "--help", "-h", "help", "--cmdlet"} for a in args):
            log(json.dumps(CMDLET, ensure_ascii=False, indent=2))
            return 0
    except Exception:
        pass
    override_hash, rest = _parse_hash_and_rest(args)
    if not rest:
        log("Requires a URL argument")
        return 1
    url = str(rest[0] or '').strip()
    if not url:
        log("Requires a non-empty URL")
        return 1
    
    # Handle @N selection which creates a list - extract the first item
    if isinstance(result, list) and len(result) > 0:
        result = result[0]
    
    hash_hex = normalize_hash(override_hash) if override_hash else normalize_hash(getattr(result, "hash_hex", None))
    if not hash_hex:
        log("Selected result does not include a Hydrus hash")
        return 1
    try:
        client = hydrus_wrapper.get_client(config)
    except Exception as exc:
        log(f"Hydrus client unavailable: {exc}")
        return 1
    
    if client is None:
        log("Hydrus client unavailable")
        return 1
    try:
        client.delete_url(hash_hex, url)
    except Exception as exc:
        log(f"Hydrus del-url failed: {exc}")
        return 1
    log(f"Deleted URL: {url}")
    return 0