from __future__ import annotations

from typing import Any, Callable, Dict, Iterable, Sequence
from importlib import import_module as _import_module

# A cmdlet is a callable taking (result, args, config) -> int
Cmdlet = Callable[[Any, Sequence[str], Dict[str, Any]], int]

# Registry of command-name -> cmdlet function
REGISTRY: Dict[str, Cmdlet] = {}


def register(names: Iterable[str]):
    """Decorator to register a function under one or more command names.

    Usage:
        @register(["add-tag", "add-tags"])
        def _run(result, args, config) -> int: ...
    """
    def _wrap(fn: Cmdlet) -> Cmdlet:
        for name in names:
            REGISTRY[name.replace('_', '-').lower()] = fn
        return fn
    return _wrap


class AutoRegister:
    """Decorator that automatically registers a cmdlet function using CMDLET.aliases.
    
    Usage:
        CMDLET = Cmdlet(
            name="delete-file",
            aliases=["del", "del-file"],
            ...
        )
        
        @AutoRegister(CMDLET)
        def _run(result, args, config) -> int:
            ...
    
    Registers the cmdlet under:
    - Its main name from CMDLET.name
    - All aliases from CMDLET.aliases
    
    This allows the help display to show: "cmd: delete-file | alias: del, del-file"
    """
    def __init__(self, cmdlet):
        self.cmdlet = cmdlet
    
    def __call__(self, fn: Cmdlet) -> Cmdlet:
        """Register fn for the main name and all aliases in cmdlet."""
        normalized_name = None
        
        # Register for main name first
        if hasattr(self.cmdlet, 'name') and self.cmdlet.name:
            normalized_name = self.cmdlet.name.replace('_', '-').lower()
            REGISTRY[normalized_name] = fn
        
        # Register for all aliases
        if hasattr(self.cmdlet, 'aliases') and self.cmdlet.aliases:
            for alias in self.cmdlet.aliases:
                normalized_alias = alias.replace('_', '-').lower()
                # Always register (aliases are separate from main name)
                REGISTRY[normalized_alias] = fn
        
        return fn


def get(cmd_name: str) -> Cmdlet | None:
    return REGISTRY.get(cmd_name.replace('_', '-').lower())


def format_cmd_help(cmdlet) -> str:
    """Format a cmdlet for help display showing cmd:name and aliases.
    
    Example output: "delete-file | aliases: del, del-file"
    """
    if not hasattr(cmdlet, 'name'):
        return str(cmdlet)
    
    cmd_str = f"cmd: {cmdlet.name}"
    
    if hasattr(cmdlet, 'aliases') and cmdlet.aliases:
        aliases_str = ", ".join(cmdlet.aliases)
        cmd_str += f" | aliases: {aliases_str}"
    
    return cmd_str


# Dynamically import all cmdlet modules in this directory (ignore files starting with _ and __init__.py)
import os
cmdlet_dir = os.path.dirname(__file__)
for filename in os.listdir(cmdlet_dir):
    if (
        filename.endswith(".py")
        and not filename.startswith("_")
        and filename != "__init__.py"
    ):
        mod_name = filename[:-3]
        try:
            module = _import_module(f".{mod_name}", __name__)
            
            # Auto-register based on CMDLET object with exec function
            # This allows cmdlets to be fully self-contained in the CMDLET object
            if hasattr(module, 'CMDLET'):
                cmdlet_obj = module.CMDLET
                
                # Get the execution function from the CMDLET object
                run_fn = getattr(cmdlet_obj, 'exec', None) if hasattr(cmdlet_obj, 'exec') else None
                
                if callable(run_fn):
                    # Register main name
                    if hasattr(cmdlet_obj, 'name') and cmdlet_obj.name:
                        normalized_name = cmdlet_obj.name.replace('_', '-').lower()
                        REGISTRY[normalized_name] = run_fn
                    
                    # Register all aliases
                    if hasattr(cmdlet_obj, 'aliases') and cmdlet_obj.aliases:
                        for alias in cmdlet_obj.aliases:
                            normalized_alias = alias.replace('_', '-').lower()
                            REGISTRY[normalized_alias] = run_fn
        except Exception:
            continue

# Import root-level modules that also register cmdlets
# Note: search_libgen, search_soulseek, and search_debrid are now consolidated into search_provider.py
# Use search-file -provider libgen, -provider soulseek, or -provider debrid instead
for _root_mod in ("select_cmdlet",):
    try:
        _import_module(_root_mod)
    except Exception:
        # Allow missing optional modules
        continue

# Also import helper modules that register cmdlets
try:
    import helper.alldebrid as _alldebrid
except Exception:
    pass