# -*- coding: utf-8 -*-
"""Agent API routes for design-time workspace registry CRUD only."""
import logging
from pathlib import Path
from typing import Any, Dict, List, Optional

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

from backend.agents import AgentFactory, get_registry

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/workspaces/{workspace_id}/agents", tags=["agents"])
DESIGN_SCOPE = "design_workspace"


def _design_scope_fields() -> dict[str, str]:
    return {
        "scope_type": DESIGN_SCOPE,
        "scope_note": (
            "For design-time CRUD routes on this surface, `workspace_id` refers "
            "to the persistent registry under `workspaces/`."
        ),
    }


# Request/Response Models
class CreateAgentRequest(BaseModel):
    """Request to create a new agent."""
    agent_id: str = Field(..., description="Unique agent identifier")
    agent_type: str = Field(..., description="Type of agent (e.g., technical_analyst)")
    name: Optional[str] = Field(None, description="Display name")
    description: Optional[str] = Field(None, description="Agent description")
    clone_from: Optional[str] = Field(None, description="Agent ID to clone from")
    llm_model_config: Optional[Dict[str, Any]] = Field(None, description="LLM model configuration")


class UpdateAgentRequest(BaseModel):
    """Request to update design-time agent metadata."""
    name: Optional[str] = None
    description: Optional[str] = None


class AgentResponse(BaseModel):
    """Agent information response."""
    agent_id: str
    agent_type: str
    workspace_id: str
    config_path: str
    agent_dir: str
    status: str = "inactive"
    scope_type: str = DESIGN_SCOPE
    scope_note: Optional[str] = None


# Dependencies
def get_agent_factory():
    """Get AgentFactory instance."""
    return AgentFactory()


# Routes
@router.post("", response_model=AgentResponse)
async def create_agent(
    workspace_id: str,
    request: CreateAgentRequest,
    factory: AgentFactory = Depends(get_agent_factory),
    registry = Depends(get_registry),
):
    """
    Create a new agent in a design-time workspace registry entry.

    Args:
        workspace_id: Workspace identifier
        request: Agent creation parameters

    Returns:
        Created agent information
    """
    # Check workspace exists
    if not factory.workspaces_root.exists():
        raise HTTPException(status_code=404, detail="Workspaces root not found")

    workspace_dir = factory.workspaces_root / workspace_id
    if not workspace_dir.exists():
        raise HTTPException(status_code=404, detail=f"Workspace '{workspace_id}' not found")

    try:
        # Create agent
        agent = factory.create_agent(
            agent_id=request.agent_id,
            agent_type=request.agent_type,
            workspace_id=workspace_id,
            clone_from=request.clone_from,
        )

        # Register in registry
        registry.register(
            agent_id=request.agent_id,
            agent_type=request.agent_type,
            workspace_id=workspace_id,
            config_path=str(agent.config_path),
            agent_dir=str(agent.agent_dir),
            status="inactive",
        )

        return AgentResponse(
            agent_id=agent.agent_id,
            agent_type=agent.agent_type,
            workspace_id=agent.workspace_id,
            config_path=str(agent.config_path),
            agent_dir=str(agent.agent_dir),
            status="inactive",
            **_design_scope_fields(),
        )

    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))


@router.get("", response_model=List[AgentResponse])
async def list_agents(
    workspace_id: str,
    factory: AgentFactory = Depends(get_agent_factory),
):
    """
    List all agents in a design-time workspace registry entry.

    Args:
        workspace_id: Workspace identifier

    Returns:
        List of agents
    """
    try:
        agents_data = factory.list_agents(workspace_id=workspace_id)
        return [
            AgentResponse(
                agent_id=agent["agent_id"],
                agent_type=agent["agent_type"],
                workspace_id=workspace_id,
                config_path=agent["config_path"],
                agent_dir=str(Path(agent["config_path"]).parent),
                status="inactive",
                **_design_scope_fields(),
            )
            for agent in agents_data
        ]
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.get("/{agent_id}", response_model=AgentResponse)
async def get_agent(
    workspace_id: str,
    agent_id: str,
    registry = Depends(get_registry),
):
    """
    Get design-time agent details from the persistent workspace registry.

    Args:
        workspace_id: Workspace identifier
        agent_id: Agent identifier

    Returns:
        Agent information
    """
    agent_info = registry.get(agent_id)

    if not agent_info or agent_info.workspace_id != workspace_id:
        raise HTTPException(status_code=404, detail=f"Agent '{agent_id}' not found")

    return AgentResponse(
        agent_id=agent_info.agent_id,
        agent_type=agent_info.agent_type,
        workspace_id=agent_info.workspace_id,
        config_path=agent_info.config_path,
        agent_dir=agent_info.agent_dir,
        status=agent_info.status,
        **_design_scope_fields(),
    )


@router.delete("/{agent_id}")
async def delete_agent(
    workspace_id: str,
    agent_id: str,
    factory: AgentFactory = Depends(get_agent_factory),
    registry = Depends(get_registry),
):
    """
    Delete an agent.

    Args:
        workspace_id: Workspace identifier
        agent_id: Agent identifier

    Returns:
        Success message
    """
    # Check agent exists in registry
    agent_info = registry.get(agent_id)
    if not agent_info or agent_info.workspace_id != workspace_id:
        raise HTTPException(status_code=404, detail=f"Agent '{agent_id}' not found")

    # Delete from factory
    success = factory.delete_agent(agent_id, workspace_id)
    if not success:
        raise HTTPException(status_code=404, detail=f"Agent '{agent_id}' not found")

    # Unregister
    registry.unregister(agent_id)

    return {"message": f"Agent '{agent_id}' deleted successfully"}


@router.patch("/{agent_id}", response_model=AgentResponse)
async def update_agent(
    workspace_id: str,
    agent_id: str,
    request: UpdateAgentRequest,
    registry = Depends(get_registry),
):
    """
    Update agent configuration.

    Args:
        workspace_id: Workspace identifier
        agent_id: Agent identifier
        request: Update parameters

    Returns:
        Updated agent information
    """
    agent_info = registry.get(agent_id)
    if not agent_info or agent_info.workspace_id != workspace_id:
        raise HTTPException(status_code=404, detail=f"Agent '{agent_id}' not found")

    # Update metadata in registry
    metadata_updates = {}
    if request.name:
        metadata_updates["name"] = request.name
    if request.description:
        metadata_updates["description"] = request.description

    if metadata_updates:
        registry.update_metadata(agent_id, metadata_updates)

    # Get updated info
    agent_info = registry.get(agent_id)
    return AgentResponse(
        agent_id=agent_info.agent_id,
        agent_type=agent_info.agent_type,
        workspace_id=agent_info.workspace_id,
        config_path=agent_info.config_path,
        agent_dir=agent_info.agent_dir,
        status=agent_info.status,
        **_design_scope_fields(),
    )