from __future__ import annotations

from typing import Any, Dict, Sequence
import json

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

CMDLET = Cmdlet(
    name="get-url",
    summary="List URLs associated with a Hydrus file.",
    usage="get-url [-hash <sha256>]",
    args=[
        CmdletArg("-hash", description="Override the Hydrus file hash (SHA256) to target instead of the selected result."),
    ],
    details=[
        "- Prints the known URLs for the selected Hydrus file.",
    ],
)


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(["get-url", "get-urls", "get_url"])  # aliases
def get_urls(result: Any, args: Sequence[str], config: Dict[str, Any]) -> int:
    # Helper to get field from both dict and object
    def get_field(obj: Any, field: str, default: Any = None) -> Any:
        if isinstance(obj, dict):
            return obj.get(field, default)
        else:
            return getattr(obj, field, default)
    
    # 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, _ = _parse_hash_and_rest(args)
    hash_hex = normalize_hash(override_hash) if override_hash else normalize_hash(get_field(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:
        payload = client.fetch_file_metadata(hashes=[hash_hex], include_file_urls=True)
    except Exception as exc:
        log(f"Hydrus metadata fetch failed: {exc}")
        return 1
    items = payload.get("metadata") if isinstance(payload, dict) else None
    meta = items[0] if (isinstance(items, list) and items and isinstance(items[0], dict)) else None
    urls = (meta.get("known_urls") if isinstance(meta, dict) else None) or []
    if urls:
        ctx.emit("URLs:")
        for u in urls:
            text = str(u).strip()
            if text:
                ctx.emit(f"- {text}")
    else:
        ctx.emit("No URLs found.")
    return 0