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from pathlib import Path

from dotenv import load_dotenv
from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

from .engine import WorkflowEngine
from .models import ResumeRequest, RunResponse, StartRequest, Workflow

load_dotenv()
app = FastAPI(title="Agentic Workflow Lab", version="1.0.0")
app.add_middleware(CORSMiddleware, allow_origins=["http://localhost:5173"], allow_methods=["*"], allow_headers=["*"])
engine = WorkflowEngine()


@app.get("/api/health")
def health() -> dict[str, str]:
    return {"status": "ok"}


@app.post("/api/run", response_model=RunResponse)
def run(request: StartRequest) -> RunResponse:
    try:
        return engine.start(request)
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@app.post("/api/resume", response_model=RunResponse)
def resume(request: ResumeRequest) -> RunResponse:
    try:
        return engine.resume(request.run_id, request.response)
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


@app.post("/api/workflows/validate", response_model=Workflow)
def validate_workflow(workflow: Workflow) -> Workflow:
    try:
        engine._validate(workflow)
        return workflow
    except Exception as exc:
        raise HTTPException(status_code=400, detail=str(exc)) from exc


dist = Path(__file__).resolve().parents[1] / "frontend" / "dist"
if dist.exists():
    app.mount("/assets", StaticFiles(directory=dist / "assets"), name="assets")

    @app.get("/{path:path}")
    def spa(path: str) -> FileResponse:
        requested = dist / path
        return FileResponse(requested if requested.is_file() else dist / "index.html")