# =================== AIPass ====================
# Name: resolver.py
# Description: Branch resolution logic for symbolic @branch names
# Version: 1.0.0
# Created: 2026-03-09
# Modified: 2026-03-09
# =============================================

"""
Branch resolution logic.

Thin orchestrator for resolving symbolic @branch names to paths and metadata.
Delegates registry access to the handler layer.
"""

from typing import Any, Dict, List, Optional

from aipass.prax import logger
from aipass.drone.apps.handlers.exceptions import BranchNotFoundError
from aipass.drone.apps.handlers.registry_handler import (
    load_registry,
    get_all_branches,
    get_branch_by_name,
)


def handle_command(command: str, args: List[str]) -> bool:
    """Route resolver commands to handler functions.

    Args:
        command: The command string (e.g. "resolve", "exists", "info", "list")
        args: List of arguments for the command

    Returns:
        True if command succeeded, False otherwise
    """
    if command == "resolve":
        if not args:
            logger.warning("resolver resolve requires a branch name")
            return False
        path = resolve_branch(args[0])
        logger.info("%s -> %s", args[0], path)
        return True
    if command == "exists":
        if not args:
            logger.warning("resolver exists requires a branch name")
            return False
        logger.info("%s exists: %s", args[0], branch_exists(args[0]))
        return True
    if command == "info":
        if not args:
            logger.warning("resolver info requires a branch name")
            return False
        info = get_branch_info(args[0])
        logger.info("Branch info: %s", info)
        return True
    if command == "list":
        branches = list_branches()
        for name in branches:
            logger.info("  %s", name)
        return True
    logger.warning("resolver: unknown command '%s'", command)
    return False


def print_help() -> None:
    """Print help for the resolver module."""
    from aipass.cli.apps.modules import console

    console.print("resolver — Branch resolution logic")
    console.print()
    console.print("Commands:")
    console.print("  resolve <branch>    Resolve branch name to path")
    console.print("  exists <branch>     Check if branch exists")
    console.print("  info <branch>       Get branch metadata")
    console.print("  list                List all branches")


def print_introspection():
    """Display module introspection info."""
    try:
        from aipass.cli.apps.modules.display import console
    except ImportError:
        from rich.console import Console
        console = Console()

    console.print()
    console.print("resolver Module")
    console.print("Branch resolution logic — resolves symbolic @branch names to paths and metadata.")
    console.print()
    console.print("Connected Handlers:")
    console.print("  handlers/")
    console.print("    - registry_handler.py (load_registry — load and parse AIPASS_REGISTRY.json)")
    console.print("    - registry_handler.py (get_all_branches — list branches with optional filters)")
    console.print("    - registry_handler.py (get_branch_by_name — look up a single branch)")
    console.print("    - exceptions.py (BranchNotFoundError — raised when branch not in registry)")
    console.print()


def normalize_branch_name(symbolic_name: str) -> str:
    """Normalize a symbolic branch name. Strips @ prefix if present."""
    if symbolic_name.startswith("@"):
        return symbolic_name[1:]
    return symbolic_name


def normalize_branch_arg(target: str) -> str:
    """Normalize @branch argument: strip @ prefix, lowercase."""
    return target.lstrip("@").lower()


def resolve_branch(symbolic_name: str) -> str:
    """Resolve a symbolic branch name to its absolute path.

    Args:
        symbolic_name: Branch name with or without @ prefix

    Returns:
        Absolute path to branch directory as string

    Raises:
        BranchNotFoundError: If branch not in registry
        RegistryNotFoundError: If registry file missing
    """
    registry = load_registry()

    name = normalize_branch_name(symbolic_name).lower()
    branch = registry.get("branches", {}).get(name)

    if branch is None:
        raise BranchNotFoundError(
            f"Branch '{symbolic_name}' not found in registry"
        )

    return branch["path"]


def branch_exists(symbolic_name: str) -> bool:
    """Check if a branch exists in the registry."""
    name = normalize_branch_name(symbolic_name).lower()
    branch = get_branch_by_name(name)
    return branch is not None


def get_branch_info(symbolic_name: str) -> Dict[str, Any]:
    """Get full metadata for a branch.

    Raises:
        BranchNotFoundError: If branch not in registry
    """
    registry = load_registry()

    name = normalize_branch_name(symbolic_name).lower()
    branch = registry.get("branches", {}).get(name)

    if branch is None:
        raise BranchNotFoundError(
            f"Branch '{symbolic_name}' not found in registry"
        )

    return branch


def list_branches(
    branch_type: Optional[str] = None,
    status: str = "active",
) -> List[str]:
    """List all registered branches, optionally filtered by type and status.

    Returns:
        List of branch names with @ prefix
    """
    branches = get_all_branches(branch_type=branch_type, status=status)
    return [f"@{branch['name']}" for branch in branches]