"""Header quick links management API endpoints."""

import logging
import re
from typing import Any

from fastapi import APIRouter, Depends, HTTPException, status
from pydantic import BaseModel, Field

from ..auth import verify_token
from ..config import LinkConfig, settings
from ..config_manager import config_manager
from ..services.websocket_manager import ws_manager

router = APIRouter(prefix="/api/links", tags=["links"])
logger = logging.getLogger(__name__)


class LinkInfo(BaseModel):
    """Information about a configured link."""

    name: str
    url: str
    icon: str
    label: str
    description: str


class LinkCreateRequest(BaseModel):
    """Request model for creating or updating a link."""

    url: str = Field(..., description="URL to open", min_length=1)
    icon: str = Field(default="mdi:link", description="MDI icon name (e.g., 'mdi:led-strip-variant')")
    label: str = Field(default="", description="Tooltip text")
    description: str = Field(default="", description="Optional description")


def _validate_link_name(name: str) -> None:
    """Validate link name.

    Args:
        name: Link name to validate.

    Raises:
        HTTPException: If name is invalid.
    """
    if not re.match(r'^[a-zA-Z0-9_]+$', name):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Link name must contain only letters, numbers, and underscores",
        )
    if len(name) > 64:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Link name must be 64 characters or less",
        )


@router.get("/list")
async def list_links(_: str = Depends(verify_token)) -> list[LinkInfo]:
    """List all configured links.

    Returns:
        List of configured links.
    """
    return [
        LinkInfo(
            name=name,
            url=config.url,
            icon=config.icon,
            label=config.label,
            description=config.description,
        )
        for name, config in settings.links.items()
    ]


@router.post("/create/{link_name}")
async def create_link(
    link_name: str,
    request: LinkCreateRequest,
    _: str = Depends(verify_token),
) -> dict[str, Any]:
    """Create a new link.

    Args:
        link_name: Link name (alphanumeric and underscores only).
        request: Link configuration.

    Returns:
        Success response with link name.
    """
    _validate_link_name(link_name)

    if link_name in settings.links:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Link '{link_name}' already exists. Use PUT /api/links/update/{link_name} to update it.",
        )

    link_config = LinkConfig(**request.model_dump())

    try:
        config_manager.add_link(link_name, link_config)
    except Exception as e:
        logger.error(f"Failed to add link '{link_name}': {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Failed to add link: {str(e)}",
        )

    await ws_manager.broadcast_links_changed()
    logger.info(f"Link '{link_name}' created successfully")
    return {"success": True, "link": link_name}


@router.put("/update/{link_name}")
async def update_link(
    link_name: str,
    request: LinkCreateRequest,
    _: str = Depends(verify_token),
) -> dict[str, Any]:
    """Update an existing link.

    Args:
        link_name: Link name.
        request: Updated link configuration.

    Returns:
        Success response with link name.
    """
    _validate_link_name(link_name)

    if link_name not in settings.links:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Link '{link_name}' not found. Use POST /api/links/create/{link_name} to create it.",
        )

    link_config = LinkConfig(**request.model_dump())

    try:
        config_manager.update_link(link_name, link_config)
    except Exception as e:
        logger.error(f"Failed to update link '{link_name}': {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Failed to update link: {str(e)}",
        )

    await ws_manager.broadcast_links_changed()
    logger.info(f"Link '{link_name}' updated successfully")
    return {"success": True, "link": link_name}


@router.delete("/delete/{link_name}")
async def delete_link(
    link_name: str,
    _: str = Depends(verify_token),
) -> dict[str, Any]:
    """Delete a link.

    Args:
        link_name: Link name.

    Returns:
        Success response with link name.
    """
    _validate_link_name(link_name)

    if link_name not in settings.links:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Link '{link_name}' not found",
        )

    try:
        config_manager.delete_link(link_name)
    except Exception as e:
        logger.error(f"Failed to delete link '{link_name}': {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Failed to delete link: {str(e)}",
        )

    await ws_manager.broadcast_links_changed()
    logger.info(f"Link '{link_name}' deleted successfully")
    return {"success": True, "link": link_name}