"""
Main FastAPI application entry point
"""

from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import HTMLResponse, FileResponse
import uvicorn
import asyncio
import logging
import os
import sys
from .api.openai_compat import router as openai_router
from .api.landppt_api import router as landppt_router
from .api.database_api import router as database_router
from .api.global_master_template_api import router as template_api_router
from .api.config_api import router as config_router
from .api.image_api import router as image_router

from .web import router as web_router
from .web.admin_routes import router as admin_router
from .web.community_routes import router as community_router
from .web.credits_routes import router as credits_router
from .auth import auth_router, create_auth_middleware
from .database.startup_initialization import run_startup_initialization
from .core.config import app_config

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Disable SQLAlchemy verbose logging completely
logging.getLogger('sqlalchemy').setLevel(logging.WARNING)
logging.getLogger('sqlalchemy.engine').setLevel(logging.WARNING)
logging.getLogger('sqlalchemy.engine.Engine').setLevel(logging.WARNING)
logging.getLogger('sqlalchemy.pool').setLevel(logging.WARNING)
logging.getLogger('sqlalchemy.dialects').setLevel(logging.WARNING)

APP_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
RESOURCE_ROOT = getattr(sys, '_MEIPASS', APP_ROOT)
PROJECT_ROOT = os.path.abspath(os.path.join(APP_ROOT, os.pardir))


def _resource_path(*parts: str) -> str:
    return os.path.join(RESOURCE_ROOT, *parts)


def _project_path(*parts: str) -> str:
    return os.path.join(PROJECT_ROOT, *parts)


# Create FastAPI app
app = FastAPI(
    title="LandPPT API",
    description="AI-powered PPT generation platform with OpenAI-compatible API",
    version="0.1.0",
    docs_url="/docs" if app_config.enable_api_docs else None,
    redoc_url="/redoc" if app_config.enable_api_docs else None,
    openapi_url="/openapi.json" if app_config.enable_api_docs else None,
)


@app.on_event("startup")
async def startup_event():
    """Initialize database on startup"""
    try:
        await run_startup_initialization()

    except Exception as e:
        logger.error(f"Failed to initialize application: {e}")
        raise


@app.on_event("shutdown")
async def shutdown_event():
    """Clean up database connections on shutdown"""
    try:
        logger.info("Shutting down application...")
        # Close cache service if enabled
        try:
            from .services.cache_service import close_cache_service
            await close_cache_service()
        except Exception:
            pass
        logger.info("Application shutdown complete")
    except Exception as e:
        logger.error(f"Error during shutdown: {e}")

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # In production, specify actual origins
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Add authentication middleware
auth_middleware = create_auth_middleware()
app.middleware("http")(auth_middleware)

# Include routers
app.include_router(auth_router, prefix="", tags=["Authentication"])
app.include_router(config_router, prefix="", tags=["Configuration Management"])
app.include_router(image_router, prefix="", tags=["Image Service"])

# Web router must come before landppt_router to ensure specific endpoints take precedence
app.include_router(web_router, prefix="", tags=["Web Interface"])
app.include_router(admin_router, tags=["Admin Management"])
app.include_router(community_router, tags=["Community Pages"])
app.include_router(credits_router, tags=["Credits System"])
app.include_router(openai_router, prefix="/v1", tags=["OpenAI Compatible"])
app.include_router(landppt_router, prefix="/api", tags=["LandPPT API"])
app.include_router(template_api_router, tags=["Global Master Templates"])
app.include_router(database_router, tags=["Database Management"])


# Mount static files
static_dir = _resource_path("src", "landppt", "web", "static")
if not os.path.exists(static_dir):
    static_dir = os.path.join(os.path.dirname(__file__), "web", "static")
app.mount("/static", StaticFiles(directory=static_dir), name="static")

# Redirect /assets/ font requests to fontsource CDN
# AI-generated slide HTML may reference fonts like /assets/inter-latin-400-normal-C38fXH4l.woff2
# (Vite/@fontsource bundled paths). This route parses the naming pattern and redirects to CDN.
import re
_FONTSOURCE_RE = re.compile(
    r'^(?P<family>[a-z0-9-]+?)-(?P<subset>[a-z]+)-(?P<weight>\d+)-(?P<style>[a-z]+)-[A-Za-z0-9_-]+\.woff2$'
)

@app.get("/assets/{filename:path}")
async def serve_font_asset(filename: str):
    """Redirect fontsource-style font requests to jsDelivr CDN"""
    from fastapi.responses import RedirectResponse
    m = _FONTSOURCE_RE.match(filename)
    if m:
        family = m.group('family')
        subset = m.group('subset')
        weight = m.group('weight')
        style = m.group('style')
        cdn_url = f"https://cdn.jsdelivr.net/fontsource/fonts/{family}@latest/{subset}-{weight}-{style}.woff2"
        return RedirectResponse(url=cdn_url, status_code=301)
    raise HTTPException(status_code=404, detail="Asset not found")

# Mount temp directory for image cache
temp_dir_candidates = [
    os.path.join(os.getcwd(), "temp"),
    _project_path("temp"),
]
temp_dir = next((path for path in temp_dir_candidates if os.path.exists(path)), None)
if temp_dir:
    app.mount("/temp", StaticFiles(directory=temp_dir), name="temp")
    logger.info(f"Mounted temp directory: {temp_dir}")
else:
    logger.warning("Temp directory not found")

@app.get("/", response_class=HTMLResponse)
async def root():
    """Root endpoint - redirect to dashboard"""
    from fastapi.responses import RedirectResponse
    return RedirectResponse(url="/dashboard", status_code=302)

@app.get("/favicon.ico")
async def favicon():
    """Serve favicon"""
    favicon_candidates = [
        os.path.join(static_dir, "images", "landppt-logo.ico"),
        os.path.join(static_dir, "images", "favicon.ico"),
        os.path.join(static_dir, "images", "favicon.svg"),
    ]
    for favicon_path in favicon_candidates:
        if os.path.exists(favicon_path):
            media_type = "image/svg+xml" if favicon_path.lower().endswith(".svg") else "image/x-icon"
            return FileResponse(favicon_path, media_type=media_type)
    raise HTTPException(status_code=404, detail="Favicon not found")

@app.get("/landppt-api-config-guide", response_class=HTMLResponse)
async def landppt_api_config_guide():
    """Serve the public LandPPT API configuration guide."""
    guide_candidates = [
        _resource_path("API 配置", "LANDPPT API 配置说明书.html"),
        _project_path("API 配置", "LANDPPT API 配置说明书.html"),
        os.path.join(os.getcwd(), "API 配置", "LANDPPT API 配置说明书.html"),
    ]
    for guide_path in guide_candidates:
        if os.path.exists(guide_path):
            return FileResponse(guide_path, media_type="text/html; charset=utf-8")
    raise HTTPException(status_code=404, detail="LANDPPT API 配置说明书.html not found")

@app.get("/landppt-api-config-guide-assets/{filename:path}")
async def landppt_api_config_guide_assets(filename: str):
    """Serve images referenced by the public LandPPT API configuration guide."""
    safe_name = os.path.basename(filename)
    asset_candidates = [
        _resource_path("API 配置", safe_name),
        _project_path("API 配置", safe_name),
        os.path.join(os.getcwd(), "API 配置", safe_name),
    ]
    asset_path = next((path for path in asset_candidates if os.path.exists(path) and os.path.isfile(path)), "")
    if not asset_path:
        raise HTTPException(status_code=404, detail="Guide asset not found")

    ext = os.path.splitext(safe_name)[1].lower()
    media_types = {
        ".png": "image/png",
        ".jpg": "image/jpeg",
        ".jpeg": "image/jpeg",
        ".webp": "image/webp",
        ".gif": "image/gif",
        ".svg": "image/svg+xml",
    }
    return FileResponse(asset_path, media_type=media_types.get(ext, "application/octet-stream"))

@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {"status": "healthy", "service": "LandPPT API"}

if __name__ == "__main__":
    uvicorn.run(
        "src.landppt.main:app",
        host="0.0.0.0",
        port=8000,
        reload=True,
        log_level="info"
    )