from fastapi import FastAPI, HTTPException, Depends
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from sqlalchemy.orm import Session
from pydantic import BaseModel
from typing import List, Optional
import json

from backend.database import get_db, Container, Base, engine
from backend.docker_manager import (
    get_docker_client, list_containers, create_container,
    start_container, stop_container, remove_container
)

# Create tables
Base.metadata.create_all(bind=engine)

app = FastAPI(title="Stronghold API")

# CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Mount static files (frontend will be served by nginx in production)
# app.mount("/", StaticFiles(directory="../frontend", html=True), name="static")

# Pydantic models
class ContainerConfig(BaseModel):
    serverName: str
    serverType: str
    version: Optional[str] = "LATEST"
    memory: Optional[str] = "2G"
    port: Optional[str] = "25565"
    difficulty: Optional[str] = None
    gamemode: Optional[str] = None
    levelType: Optional[str] = None
    motd: Optional[str] = None
    maxPlayers: Optional[int] = 20
    viewDistance: Optional[int] = 10
    acceptEULA: bool = True
    enableRCON: bool = False
    rconPort: Optional[str] = "25575"
    rconPassword: Optional[str] = None
    pvpEnabled: bool = True
    allowFlight: bool = False
    restartPolicy: str = "unless-stopped"

class ContainerResponse(BaseModel):
    id: int
    container_id: str
    name: str
    image: str
    status: str
    created_at: str

# API Routes
@app.get("/api/containers")
def get_containers(db: Session = Depends(get_db)):
    """List all Stronghold-managed containers"""
    try:
        client = get_docker_client()
        docker_containers = list_containers(client)
        
        # Get containers from database
        db_containers = db.query(Container).all()
        
        # Merge data
        result = []
        for db_container in db_containers:
            # Find matching docker container
            docker_container = next(
                (dc for dc in docker_containers if dc.id == db_container.container_id),
                None
            )
            
            status = docker_container.status if docker_container else "unknown"
            
            result.append({
                "id": db_container.id,
                "container_id": db_container.container_id,
                "name": db_container.name,
                "image": db_container.image,
                "status": status,
                "created_at": db_container.created_at.isoformat() if db_container.created_at else None
            })
        
        return result
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/api/containers")
def create_container_endpoint(config: ContainerConfig, db: Session = Depends(get_db)):
    """Create a new Minecraft server container"""
    try:
        client = get_docker_client()
        
        # Check if name already exists
        existing = db.query(Container).filter(Container.name == config.serverName).first()
        if existing:
            raise HTTPException(status_code=400, detail="Container name already exists")
        
        # Create container
        docker_container = create_container(client, config.serverName, config.dict())
        
        # Save to database
        db_container = Container(
            container_id=docker_container.id,
            name=config.serverName,
            image="itzg/minecraft-server",
            status="created",
            config_json=json.dumps(config.dict())
        )
        db.add(db_container)
        db.commit()
        db.refresh(db_container)
        
        # Start container
        docker_container.start()
        
        # Update status
        db_container.status = "running"
        db.commit()
        
        return {
            "id": db_container.id,
            "container_id": docker_container.id,
            "name": config.serverName,
            "status": "running"
        }
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/api/containers/{container_id}/start")
def start_container_endpoint(container_id: str, db: Session = Depends(get_db)):
    """Start a container"""
    try:
        client = get_docker_client()
        container = start_container(client, container_id)
        
        # Update database
        db_container = db.query(Container).filter(Container.container_id == container_id).first()
        if db_container:
            db_container.status = "running"
            db.commit()
        
        return {"status": "started", "container_id": container_id}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.post("/api/containers/{container_id}/stop")
def stop_container_endpoint(container_id: str, db: Session = Depends(get_db)):
    """Stop a container"""
    try:
        client = get_docker_client()
        container = stop_container(client, container_id)
        
        # Update database
        db_container = db.query(Container).filter(Container.container_id == container_id).first()
        if db_container:
            db_container.status = "stopped"
            db.commit()
        
        return {"status": "stopped", "container_id": container_id}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.delete("/api/containers/{container_id}")
def delete_container_endpoint(container_id: str, db: Session = Depends(get_db)):
    """Delete a container"""
    try:
        client = get_docker_client()
        remove_container(client, container_id)
        
        # Remove from database
        db_container = db.query(Container).filter(Container.container_id == container_id).first()
        if db_container:
            db.delete(db_container)
            db.commit()
        
        return {"status": "deleted", "container_id": container_id}
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/api/health")
def health_check():
    """Health check endpoint"""
    return {"status": "ok"}