"""
Mitai Jinkendo API - Main Application

FastAPI backend with modular router structure.
"""
import os
from pathlib import Path

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from slowapi import Limiter, _rate_limit_exceeded_handler
from slowapi.util import get_remote_address
from slowapi.errors import RateLimitExceeded

from db import init_db

# Import routers
from routers import auth, profiles, weight, circumference, caliper
from routers import activity, nutrition, photos, insights, prompts
from routers import admin, stats, exportdata, importdata

# ── App Configuration ─────────────────────────────────────────────────────────
DATA_DIR   = Path(os.getenv("DATA_DIR",   "./data"))
PHOTOS_DIR = Path(os.getenv("PHOTOS_DIR", "./photos"))
DATA_DIR.mkdir(parents=True, exist_ok=True)
PHOTOS_DIR.mkdir(parents=True, exist_ok=True)

app = FastAPI(title="Mitai Jinkendo API", version="3.0.0")

# Rate limiting
limiter = Limiter(key_func=get_remote_address)
app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)

# CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=os.getenv("ALLOWED_ORIGINS", "*").split(","),
    allow_credentials=True,
    allow_methods=["GET","POST","PUT","DELETE","OPTIONS"],
    allow_headers=["*"],
)

# ── Startup Event ─────────────────────────────────────────────────────────────
@app.on_event("startup")
async def startup_event():
    """Run database initialization on startup."""
    try:
        init_db()
    except Exception as e:
        print(f"⚠️  init_db() failed (non-fatal): {e}")
        # Don't crash on startup - can be created manually

    # Apply v9c migration if needed
    try:
        from apply_v9c_migration import apply_migration
        apply_migration()
    except Exception as e:
        print(f"⚠️  v9c migration failed (non-fatal): {e}")

# ── Register Routers ──────────────────────────────────────────────────────────
app.include_router(auth.router)           # /api/auth/*
app.include_router(profiles.router)       # /api/profiles/*, /api/profile
app.include_router(weight.router)         # /api/weight/*
app.include_router(circumference.router)  # /api/circumferences/*
app.include_router(caliper.router)        # /api/caliper/*
app.include_router(activity.router)       # /api/activity/*
app.include_router(nutrition.router)      # /api/nutrition/*
app.include_router(photos.router)         # /api/photos/*
app.include_router(insights.router)       # /api/insights/*, /api/ai/*
app.include_router(prompts.router)        # /api/prompts/*
app.include_router(admin.router)          # /api/admin/*
app.include_router(stats.router)          # /api/stats
app.include_router(exportdata.router)     # /api/export/*
app.include_router(importdata.router)     # /api/import/*

# ── Health Check ──────────────────────────────────────────────────────────────
@app.get("/")
def root():
    """API health check."""
    return {"status": "ok", "service": "mitai-jinkendo", "version": "v9c-dev"}