"""
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
from routers import subscription, coupons, features, tiers_mgmt, tier_limits
from routers import user_restrictions, access_grants, training_types, admin_training_types
from routers import admin_activity_mappings, sleep, rest_days
from routers import evaluation  # v9d/v9e Training Type Profiles (#15)

# ── 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/*

# v9c Subscription System
app.include_router(subscription.router)   # /api/subscription/*
app.include_router(coupons.router)        # /api/coupons/*
app.include_router(features.router)       # /api/features (admin)
app.include_router(tiers_mgmt.router)     # /api/tiers (admin)
app.include_router(tier_limits.router)    # /api/tier-limits (admin)
app.include_router(user_restrictions.router)  # /api/user-restrictions (admin)
app.include_router(access_grants.router)  # /api/access-grants (admin)

# v9d Training Types & Sleep Module & Rest Days
app.include_router(training_types.router)       # /api/training-types/*
app.include_router(admin_training_types.router) # /api/admin/training-types/*
app.include_router(admin_activity_mappings.router) # /api/admin/activity-mappings/*
app.include_router(sleep.router)                # /api/sleep/* (v9d Phase 2b)
app.include_router(rest_days.router)            # /api/rest-days/* (v9d Phase 2a)
app.include_router(evaluation.router)           # /api/evaluation/* (v9d/v9e Training Profiles #15)

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