import os
from pathlib import Path
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
from contextlib import asynccontextmanager

from .database import init_db_pool, init_tables
from .routers import auth, meetings, ai, export, sidecar
from .sidecar_manager import get_sidecar_manager

# Determine client directory path
BACKEND_DIR = Path(__file__).parent.parent
PROJECT_DIR = BACKEND_DIR.parent
CLIENT_DIR = PROJECT_DIR / "client" / "src"


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Startup
    init_db_pool()
    init_tables()

    # Only start sidecar in browser mode (not when Electron manages it)
    # Set BROWSER_MODE=true in start-browser.sh to enable
    browser_mode = os.environ.get("BROWSER_MODE", "").lower() == "true"
    sidecar_mgr = get_sidecar_manager()

    if browser_mode and sidecar_mgr.is_available():
        print("[Backend] Browser mode: Starting sidecar...")
        await sidecar_mgr.start()
    elif browser_mode:
        print("[Backend] Browser mode: Sidecar not available (transcription disabled)")
    else:
        print("[Backend] Electron mode: Sidecar managed by Electron")

    yield

    # Shutdown - only stop if we started it
    if browser_mode:
        sidecar_mgr.stop()


app = FastAPI(
    title="Meeting Assistant API",
    description="Enterprise meeting knowledge management API",
    version="1.0.0",
    lifespan=lifespan,
)

# CORS configuration for Electron client
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include routers
app.include_router(auth.router, prefix="/api", tags=["Authentication"])
app.include_router(meetings.router, prefix="/api", tags=["Meetings"])
app.include_router(ai.router, prefix="/api", tags=["AI"])
app.include_router(export.router, prefix="/api", tags=["Export"])
app.include_router(sidecar.router, prefix="/api", tags=["Sidecar"])


@app.get("/api/health")
async def health_check():
    """Health check endpoint."""
    return {"status": "healthy", "service": "meeting-assistant"}


# ========================================
# Browser Mode: Serve static files
# ========================================

# Check if client directory exists for browser mode
if CLIENT_DIR.exists():
    # Serve static assets (CSS, JS, etc.)
    app.mount("/styles", StaticFiles(directory=CLIENT_DIR / "styles"), name="styles")
    app.mount("/services", StaticFiles(directory=CLIENT_DIR / "services"), name="services")
    app.mount("/config", StaticFiles(directory=CLIENT_DIR / "config"), name="config")

    @app.get("/")
    async def serve_login():
        """Serve login page."""
        return FileResponse(CLIENT_DIR / "pages" / "login.html")

    @app.get("/login")
    async def serve_login_page():
        """Serve login page."""
        return FileResponse(CLIENT_DIR / "pages" / "login.html")

    @app.get("/meetings")
    async def serve_meetings_page():
        """Serve meetings list page."""
        return FileResponse(CLIENT_DIR / "pages" / "meetings.html")

    @app.get("/meeting-detail")
    async def serve_meeting_detail_page():
        """Serve meeting detail page."""
        return FileResponse(CLIENT_DIR / "pages" / "meeting-detail.html")