from __future__ import annotations

from typing import Any, Dict, Sequence
import sys

import pipeline as ctx
from . import _shared as sh
from SYS.logger import log
from Store import Store


class Add_Url(sh.Cmdlet):
    """Add URL associations to files via hash+store."""

    def __init__(self) -> None:
        super().__init__(
            name="add-url",
            summary="Associate a URL with a file",
            usage="@1 | add-url <url>",
            arg=[
                sh.SharedArgs.HASH,
                sh.SharedArgs.STORE,
                sh.CmdletArg("url", required=True, description="URL to associate"),
            ],
            detail=[
                "- Associates URL with file identified by hash+store",
                "- Multiple url can be comma-separated",
            ],
            exec=self.run,
        )
        self.register()
    
    def run(self, result: Any, args: Sequence[str], config: Dict[str, Any]) -> int:
        """Add URL to file via hash+store backend."""
        parsed = sh.parse_cmdlet_args(args, self)
        
        # Extract hash and store from result or args
        file_hash = parsed.get("hash") or sh.get_field(result, "hash")
        store_name = parsed.get("store") or sh.get_field(result, "store")
        url_arg = parsed.get("url")
        
        if not file_hash:
            log("Error: No file hash provided")
            return 1
            
        if not store_name:
            log("Error: No store name provided")
            return 1
            
        if not url_arg:
            log("Error: No URL provided")
            return 1
        
        # Normalize hash
        file_hash = sh.normalize_hash(file_hash)
        if not file_hash:
            log("Error: Invalid hash format")
            return 1
        
        # Parse url (comma-separated)
        urls = [u.strip() for u in str(url_arg).split(',') if u.strip()]
        if not urls:
            log("Error: No valid url provided")
            return 1
        
        # Get backend and add url
        try:
            storage = Store(config)
            backend = storage[store_name]

            backend.add_url(file_hash, urls)
            for u in urls:
                ctx.emit(f"Added URL: {u}")
            
            return 0
            
        except KeyError:
            log(f"Error: Storage backend '{store_name}' not configured")
            return 1
        except Exception as exc:
            log(f"Error adding URL: {exc}", file=sys.stderr)
            return 1


CMDLET = Add_Url()