"""
Manus AI Clone - AI-powered browser automation API
"""

import os
from contextlib import asynccontextmanager
from pathlib import Path
from typing import Optional

from dotenv import load_dotenv
from fastapi import FastAPI, HTTPException, Request
from fastapi.responses import HTMLResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from pydantic import BaseModel, ConfigDict
from pydantic_settings import BaseSettings

from browser_agent import BrowserAgent

# Load environment variables
load_dotenv()

# Get base directory
BASE_DIR = Path(__file__).resolve().parent

# Setup templates and static files
templates = Jinja2Templates(directory=str(BASE_DIR / "templates"))


class Settings(BaseSettings):
    """Application settings"""

    model_config = ConfigDict(env_file=".env")

    openai_api_key: str = os.getenv("OPENAI_API_KEY", "")
    model: str = os.getenv("MODEL", "gpt-4o-mini")
    headless: bool = os.getenv("HEADLESS", "false").lower() == "true"


# Global agent instance
agent: Optional[BrowserAgent] = None
settings = Settings()


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Manage application lifecycle"""
    global agent

    # Startup
    if not settings.openai_api_key:
        print("Warning: OPENAI_API_KEY not set. Please set it in .env file")
    else:
        print("Initializing browser agent...")
        agent = BrowserAgent(
            openai_api_key=settings.openai_api_key, model=settings.model
        )
        await agent.initialize(headless=settings.headless)
        print("Browser agent ready!")

    yield

    # Shutdown
    if agent:
        print("Cleaning up browser agent...")
        await agent.cleanup()
        print("Cleanup complete")


# Create FastAPI app
app = FastAPI(
    title="Manus AI Clone",
    description="AI-powered browser automation using LangChain and Playwright",
    version="0.1.0",
    lifespan=lifespan,
)

# Mount static files
app.mount("/static", StaticFiles(directory=str(BASE_DIR / "static")), name="static")


# Pydantic models
class TaskRequest(BaseModel):
    """Request model for browser automation tasks"""

    model_config = ConfigDict(
        json_schema_extra={
            "example": {
                "prompt": "Go to google.com and search for 'LangChain tutorial'"
            }
        }
    )

    prompt: str


class TaskResponse(BaseModel):
    """Response model for browser automation tasks"""

    success: bool
    output: Optional[str] = None
    error: Optional[str] = None
    screenshot: Optional[str] = None
    action_history: list = []


# API Routes
@app.get("/", response_class=HTMLResponse)
async def home(request: Request):
    """Serve the frontend interface"""
    return templates.TemplateResponse("index.html", {"request": request})


@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {
        "status": "healthy",
        "agent_initialized": agent is not None,
        "model": settings.model,
    }


@app.post("/execute", response_model=TaskResponse)
async def execute_task(request: TaskRequest):
    """Execute a browser automation task"""
    if not agent:
        raise HTTPException(
            status_code=503,
            detail="Browser agent not initialized. Please check OPENAI_API_KEY.",
        )

    if not request.prompt.strip():
        raise HTTPException(status_code=400, detail="Prompt cannot be empty")

    try:
        result = await agent.execute_task(request.prompt)
        return TaskResponse(**result)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Error executing task: {str(e)}")


@app.get("/status")
async def get_status():
    """Get current browser status and action history"""
    if not agent:
        raise HTTPException(status_code=503, detail="Browser agent not initialized")

    return {
        "action_history": agent.browser.action_history,
        "current_url": agent.browser.page.url if agent.browser.page else None,
    }


def main():
    """Run the application"""
    import uvicorn

    port = int(os.getenv("PORT", "8000"))
    host = os.getenv("HOST", "0.0.0.0")

    print(f"""
    🤖 Manus AI Clone Starting...
    
    📝 Make sure to set OPENAI_API_KEY in your .env file
    🌐 Server will be available at: http://localhost:{port}
    
    """)

    uvicorn.run(app, host=host, port=port)


if __name__ == "__main__":
    main()