#!/usr/bin/env python3
"""
Wetterstation Web-Interface - Visualisierung und API
Stellt das Web-Interface und Lese-APIs für historische Daten bereit
"""

import sqlite3
import json
import os
from datetime import datetime, timedelta
from flask import Flask, render_template, jsonify
from dotenv import load_dotenv

# Lade Umgebungsvariablen aus .env Datei
load_dotenv()

# Konfiguration aus Umgebungsvariablen
DB_FILE = os.getenv("DB_FILE", "wetterdaten.db")
HTTP_PORT = int(os.getenv("HTTP_PORT", 5003))

app = Flask(__name__)


class WetterDB:
    """Klasse für Datenbankoperationen (nur Lesezugriff)"""
    
    def __init__(self, db_file):
        self.db_file = db_file
    
    def get_data(self, hours=24):
        """Daten der letzten X Stunden abrufen"""
        conn = sqlite3.connect(self.db_file)
        conn.row_factory = sqlite3.Row
        cursor = conn.cursor()
        
        time_threshold = (datetime.now() - timedelta(hours=hours)).strftime('%Y-%m-%d %H:%M:%S')
        
        cursor.execute('''
            SELECT * FROM wetterdaten 
            WHERE dateTime >= ? 
            ORDER BY dateTime ASC
        ''', (time_threshold,))
        
        rows = cursor.fetchall()
        conn.close()
        
        return [dict(row) for row in rows]
    
    def get_hourly_rain(self, hours=24):
        """Regenmenge pro Stunde berechnen"""
        conn = sqlite3.connect(self.db_file)
        cursor = conn.cursor()
        
        time_threshold = (datetime.now() - timedelta(hours=hours)).strftime('%Y-%m-%d %H:%M:%S')
        
        cursor.execute('''
            SELECT 
                strftime('%Y-%m-%d %H:00:00', dateTime) as hour,
                SUM(rainRate) as total_rain
            FROM wetterdaten 
            WHERE dateTime >= ?
            GROUP BY hour
            ORDER BY hour ASC
        ''', (time_threshold,))
        
        rows = cursor.fetchall()
        conn.close()
        
        return [{'hour': row[0], 'rain': row[1] or 0} for row in rows]


# Globale Datenbankinstanz
db = WetterDB(DB_FILE)


# Flask Routes
@app.route('/')
def index():
    """Hauptseite"""
    return render_template('index.html')


@app.route('/health')
def health():
    """Health-Check Endpoint"""
    return jsonify({'status': 'ok', 'service': 'web'}), 200


@app.route('/api/data/<period>')
def get_historical_data(period):
    """API Endpoint für historische Wetterdaten"""
    hours = 24 if period == 'day' else 168  # 168h = 1 Woche
    data = db.get_data(hours)
    rain_data = db.get_hourly_rain(hours)
    
    return jsonify({
        'data': data,
        'rain_hourly': rain_data
    })


def main():
    """Hauptprogramm"""
    print("Wetterstation Web-Interface wird gestartet...")
    print(f"\nWeb-Interface verfügbar unter: http://0.0.0.0:{HTTP_PORT}")
    print(f"API Endpoints:")
    print(f"  - http://0.0.0.0:{HTTP_PORT}/api/data/day")
    print(f"  - http://0.0.0.0:{HTTP_PORT}/api/data/week")
    print(f"Health-Check: http://0.0.0.0:{HTTP_PORT}/health")
    print("Drücke CTRL+C zum Beenden\n")
    app.run(host='0.0.0.0', port=HTTP_PORT, debug=False)


if __name__ == '__main__':
    main()