"""
Workflow CRUD endpoints
"""
from fastapi import APIRouter, HTTPException
from models.workflow import Workflow, Node, Edge
from typing import Optional

router = APIRouter()

# In-memory storage for MVP (frontend uses localStorage, this is for API testing)
workflows_db: dict[str, Workflow] = {}


@router.get("/")
async def list_workflows():
    """List all workflows"""
    return {"workflows": list(workflows_db.values())}


@router.get("/{workflow_id}")
async def get_workflow(workflow_id: str):
    """Get a specific workflow by ID"""
    if workflow_id not in workflows_db:
        raise HTTPException(status_code=404, detail="Workflow not found")
    return workflows_db[workflow_id]


@router.post("/")
async def create_workflow(workflow: Workflow):
    """Create a new workflow"""
    workflows_db[workflow.id] = workflow
    return {"message": "Workflow created", "workflow": workflow}


@router.put("/{workflow_id}")
async def update_workflow(workflow_id: str, workflow: Workflow):
    """Update an existing workflow"""
    if workflow_id not in workflows_db:
        raise HTTPException(status_code=404, detail="Workflow not found")
    workflow.id = workflow_id  # Ensure ID matches
    workflows_db[workflow_id] = workflow
    return {"message": "Workflow updated", "workflow": workflow}


@router.delete("/{workflow_id}")
async def delete_workflow(workflow_id: str):
    """Delete a workflow"""
    if workflow_id not in workflows_db:
        raise HTTPException(status_code=404, detail="Workflow not found")
    del workflows_db[workflow_id]
    return {"message": "Workflow deleted"}


@router.post("/validate")
async def validate_workflow(workflow: Workflow):
    """Validate a workflow structure (Guardian pre-check)"""
    errors = []
    warnings = []
    
    # Check for trigger node
    trigger_nodes = [n for n in workflow.nodes if n.type == "trigger"]
    if len(trigger_nodes) == 0:
        errors.append("Workflow must have at least one trigger node")
    elif len(trigger_nodes) > 1:
        warnings.append("Multiple trigger nodes found - only first will be used")
    
    # Check for orphan nodes (no connections)
    connected_nodes = set()
    for edge in workflow.edges:
        connected_nodes.add(edge.source)
        connected_nodes.add(edge.target)
    
    for node in workflow.nodes:
        if node.id not in connected_nodes and node.type != "trigger":
            warnings.append(f"Node '{node.data.label}' is not connected to any other node")
    
    # Check LLM nodes have required fields
    for node in workflow.nodes:
        if node.type == "llm":
            if not node.data.provider:
                errors.append(f"LLM node '{node.data.label}' must have a provider")
            if not node.data.model:
                errors.append(f"LLM node '{node.data.label}' must have a model")
    
    return {
        "valid": len(errors) == 0,
        "errors": errors,
        "warnings": warnings
    }