#!/usr/bin/env python3
"""
AI Router API — Multi-provider LLM routing with failover
Port: 8783 | DB: SQLite ai_router.db
HRT-200 — AI Router (Multi-provider + failover)

Endpoints:
  GET    /api/v1/ai/health              — Check all providers health
  GET    /api/v1/ai/models              — List available models
  POST   /api/v1/ai/chat                — Chat completion with auto-failover
  GET    /api/v1/ai/admin/providers     — List configured providers
  POST   /api/v1/ai/admin/providers     — Upsert a provider
  POST   /api/v1/ai/admin/model-mappings— Upsert a model mapping
  DELETE /api/v1/ai/admin/providers/:id — Remove a provider
  GET    /api/v1/ai/usage               — Usage logs
  GET    /api/v1/ai/usage/summary       — Aggregated usage stats
"""

import logging
import logging.handlers
import os
import sys

from flask import Flask, jsonify
from flask_cors import CORS

LOG_DIR = os.path.join(os.path.dirname(__file__), "ai_router", "logs")
os.makedirs(LOG_DIR, exist_ok=True)

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] ai-router: %(name)s: %(message)s",
    handlers=[
        logging.StreamHandler(sys.stdout),
        logging.handlers.RotatingFileHandler(
            os.path.join(LOG_DIR, "ai_router.log"),
            maxBytes=5 * 1024 * 1024,
            backupCount=3,
        ),
    ],
)
logger = logging.getLogger("ai_router")

PORT = int(os.environ.get("AI_ROUTER_PORT", "8783"))


def create_app():
    app = Flask(__name__)
    CORS(app)

    from ai_router.api import register_ai_router
    from ai_router.models import init_db

    init_db()
    register_ai_router(app)

    @app.errorhandler(404)
    def not_found(e):
        return jsonify({"error": "not_found", "message": "Route not found"}), 404

    @app.errorhandler(500)
    def internal_error(e):
        logger.error(f"Internal error: {e}")
        return jsonify({"error": "internal_error", "message": "Internal server error"}), 500

    return app


if __name__ == "__main__":
    logger.info("=" * 60)
    logger.info("AI Router API starting...")
    logger.info(f"Port: {PORT}")
    logger.info("=" * 60)

    app = create_app()
    debug = os.environ.get("FLASK_ENV", "production") == "development"
    app.run(host="0.0.0.0", port=PORT, debug=debug)