from flask import Flask, render_template, request, redirect, url_for, jsonify, make_response, session
from flask_sqlalchemy import SQLAlchemy
from flask_migrate import Migrate
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
from werkzeug.security import generate_password_hash, check_password_hash
import os, json
from datetime import datetime, timedelta
from io import BytesIO
from xhtml2pdf import pisa

app = Flask(__name__)

# --- Konfiguration ---
app.config['SQLALCHEMY_DATABASE_URI'] = os.environ.get('DATABASE_URL', 'sqlite:////app/data/raceplanner.db')
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SECRET_KEY'] = 'renn-strategie-2026-final-v3'
app.config['REMEMBER_COOKIE_DURATION'] = timedelta(days=31)
app.config['PERMANENT_SESSION_LIFETIME'] = timedelta(days=31)

SCENARIO_DIR = '/app/data/scenarios/'

db = SQLAlchemy(app)
migrate = Migrate(app, db)
login_manager = LoginManager(app)
login_manager.login_view = 'login'

if not os.path.exists(SCENARIO_DIR):
    os.makedirs(SCENARIO_DIR)

# --- Models ---
class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(100), unique=True, nullable=False)
    password = db.Column(db.String(200), nullable=False)

class Driver(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50), nullable=False)
    car_number = db.Column(db.Integer, nullable=False)
    cons_per_lap = db.Column(db.Float, default=16.0)
    avg_lap_time = db.Column(db.Float, default=540.0)
    tire_life_laps = db.Column(db.Integer, default=50)
    order_index = db.Column(db.Integer, default=0)

class Stint(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    car_number = db.Column(db.Integer, nullable=False)
    driver_id = db.Column(db.Integer, db.ForeignKey('driver.id'))
    order_index = db.Column(db.Integer, default=0)
    driver = db.relationship('Driver', backref='stints')

class RaceConfig(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    tank_capacity = db.Column(db.Float, default=100.0)
    race_duration_hours = db.Column(db.Integer, default=24)
    start_time = db.Column(db.DateTime, default=datetime(2026, 1, 31, 12, 0))
    interruption_mins = db.Column(db.Integer, default=0)
    always_change_tires = db.Column(db.Boolean, default=False)
    min_pit_stop_sec = db.Column(db.Integer, default=180)

@login_manager.user_loader
def load_user(user_id):
    return db.session.get(User, int(user_id))

def save_undo_state(car_num):
    stints = Stint.query.filter_by(car_number=car_num).order_by(Stint.order_index).all()
    session[f'undo_{car_num}'] = [{'driver_id': s.driver_id, 'order_index': s.order_index} for s in stints]

def get_calculated_schedule(car_num):
    config = RaceConfig.query.first()
    stints = Stint.query.filter_by(car_number=car_num).order_by(Stint.order_index).all()
    schedule = []
    current_time = (config.start_time or datetime(2026, 1, 31, 12, 0)) + timedelta(minutes=config.interruption_mins)
    race_end = config.start_time + timedelta(hours=config.race_duration_hours)
    current_tire_laps = 0

    for i, s in enumerate(stints):
        if current_time >= race_end: break
        driver = s.driver
        if not driver: continue
        
        laps_possible = int(config.tank_capacity / driver.cons_per_lap)
        stint_dur = laps_possible * driver.avg_lap_time
        end_time = current_time + timedelta(seconds=stint_dur)
        
        is_finish = False
        laps_to_do = laps_possible
        if end_time >= race_end:
            is_finish = True
            rem_sec = (race_end - current_time).total_seconds()
            laps_to_do = int(rem_sec / driver.avg_lap_time)
            end_time = race_end

        change_tires = config.always_change_tires or (current_tire_laps + laps_to_do) > driver.tire_life_laps
        fuel = round(laps_to_do * driver.cons_per_lap, 1)
        
        schedule.append({
            'number': i + 1, 'stint_id': s.id, 'driver_id': driver.id, 'driver_name': driver.name,
            'start': current_time.strftime('%H:%M'), 'end': end_time.strftime('%H:%M'),
            'date': current_time.strftime('%d.%m.'), 'laps': laps_to_do, 'fuel': fuel,
            'change_tires': change_tires, 'is_finish': is_finish
        })
        if is_finish: break
        current_tire_laps = laps_to_do if change_tires else current_tire_laps + laps_to_do
        current_time = end_time + timedelta(seconds=config.min_pit_stop_sec)
    return schedule

@app.route('/')
@login_required
def index():
    config = RaceConfig.query.first()
    sch1, sch2 = get_calculated_schedule(1), get_calculated_schedule(2)
    stint_counts = {d.id: 0 for d in Driver.query.all()}
    for s in sch1 + sch2:
        stint_counts[s['driver_id']] = stint_counts.get(s['driver_id'], 0) + 1
    
    c1_drivers = Driver.query.filter_by(car_number=1).order_by(Driver.order_index).all()
    c2_drivers = Driver.query.filter_by(car_number=2).order_by(Driver.order_index).all()
    scenarios = [f for f in os.listdir(SCENARIO_DIR) if f.endswith('.json')]
    return render_template('index.html', config=config, schedule1=sch1, schedule2=sch2,
                           car1_drivers=c1_drivers, car2_drivers=c2_drivers, 
                           stint_counts=stint_counts, scenarios=scenarios)

@app.route('/update_config', methods=['POST'])
@login_required
def update_config():
    config = RaceConfig.query.first()
    config.tank_capacity = float(request.form.get('tank_capacity'))
    config.race_duration_hours = int(request.form.get('race_duration_hours'))
    config.min_pit_stop_sec = int(request.form.get('min_pit_stop_sec'))
    config.always_change_tires = 'always_change_tires' in request.form
    dt_str = request.form.get('start_datetime')
    if dt_str: config.start_time = datetime.strptime(dt_str, '%Y-%m-%dT%H:%M')
    db.session.commit()
    return redirect(url_for('index'))

@app.route('/add_driver', methods=['POST'])
@login_required
def add_driver():
    car_num = int(request.form.get('car_number'))
    new_d = Driver(name=request.form.get('name'), car_number=car_num,
                   cons_per_lap=float(request.form.get('cons') or 16.0),
                   avg_lap_time=float(request.form.get('lap_time') or 540.0))
    db.session.add(new_d); db.session.commit()
    return redirect(url_for('index'))

@app.route('/update_driver/<int:id>', methods=['POST'])
@login_required
def update_driver(id):
    d = db.session.get(Driver, id)
    if d:
        d.name = request.form.get('name')
        d.cons_per_lap = float(request.form.get('cons'))
        d.avg_lap_time = float(request.form.get('lap_time'))
        db.session.commit()
    return redirect(url_for('index'))

@app.route('/delete_driver/<int:id>')
@login_required
def delete_driver(id):
    d = db.session.get(Driver, id)
    if d:
        Stint.query.filter_by(driver_id=id).delete()
        db.session.delete(d); db.session.commit()
    return redirect(url_for('index'))

@app.route('/update_stint_driver', methods=['POST'])
@login_required
def update_stint_driver():
    data = request.json
    stint = db.session.get(Stint, data.get('stint_id'))
    if stint:
        save_undo_state(stint.car_number)
        stint.driver_id = data.get('driver_id')
        db.session.commit()
    return jsonify({'status': 'ok'})

@app.route('/reorder_stints', methods=['POST'])
@login_required
def reorder_stints():
    order = request.json.get('order', [])
    if order:
        first = db.session.get(Stint, order[0])
        if first: save_undo_state(first.car_number)
        for idx, sid in enumerate(order):
            s = db.session.get(Stint, sid)
            if s: s.order_index = idx
        db.session.commit()
    return jsonify({'status': 'ok'})

@app.route('/undo/<int:car_num>')
@login_required
def undo(car_num):
    state = session.get(f'undo_{car_num}')
    if state:
        Stint.query.filter_by(car_number=car_num).delete()
        for s_data in state:
            db.session.add(Stint(car_number=car_num, driver_id=s_data['driver_id'], order_index=s_data['order_index']))
        db.session.commit()
        session.pop(f'undo_{car_num}')
    return redirect(url_for('index'))

@app.route('/generate_schedule/<int:car_num>')
@login_required
def generate_schedule(car_num):
    drivers = Driver.query.filter_by(car_number=car_num).order_by(Driver.order_index).all()
    if not drivers: return redirect(url_for('index'))
    save_undo_state(car_num)
    Stint.query.filter_by(car_number=car_num).delete()
    for i in range(40):
        db.session.add(Stint(car_number=car_num, driver_id=drivers[i % len(drivers)].id, order_index=i))
    db.session.commit()
    return redirect(url_for('index'))

@app.route('/save_scenario', methods=['POST'])
@login_required
def save_scenario():
    name = request.form.get('scenario_name')
    config = RaceConfig.query.first()
    data = {
        'config': {'tank_capacity': config.tank_capacity, 'race_duration_hours': config.race_duration_hours, 'start_time': config.start_time.isoformat(), 'min_pit_stop_sec': config.min_pit_stop_sec, 'always_change_tires': config.always_change_tires},
        'drivers': [{'id': d.id, 'name': d.name, 'car_number': d.car_number, 'cons_per_lap': d.cons_per_lap, 'avg_lap_time': d.avg_lap_time} for d in Driver.query.all()],
        'stints': [{'car_number': s.car_number, 'driver_id': s.driver_id, 'order_index': s.order_index} for s in Stint.query.all()]
    }
    with open(os.path.join(SCENARIO_DIR, f"{name}.json"), 'w') as f: json.dump(data, f)
    return redirect(url_for('index'))

@app.route('/load_scenario', methods=['POST'])
@login_required
def load_scenario():
    path = os.path.join(SCENARIO_DIR, request.form.get('scenario_file'))
    with open(path, 'r') as f: data = json.load(f)
    Stint.query.delete(); Driver.query.delete(); RaceConfig.query.delete()
    c = data['config']
    db.session.add(RaceConfig(tank_capacity=c['tank_capacity'], race_duration_hours=c['race_duration_hours'], start_time=datetime.fromisoformat(c['start_time']), min_pit_stop_sec=c.get('min_pit_stop_sec', 180), always_change_tires=c['always_change_tires']))
    id_map = {}
    for d in data['drivers']:
        new_d = Driver(name=d['name'], car_number=d['car_number'], cons_per_lap=d['cons_per_lap'], avg_lap_time=d['avg_lap_time'])
        db.session.add(new_d); db.session.flush(); id_map[d['id']] = new_d.id
    for s in data['stints']:
        db.session.add(Stint(car_number=s['car_number'], driver_id=id_map.get(s['driver_id']), order_index=s['order_index']))
    db.session.commit()
    return redirect(url_for('index'))

@app.route('/export/car/<int:car_num>')
@login_required
def export_car_pdf(car_num):
    config = RaceConfig.query.first()
    html = render_template('pdf_template.html', schedule=get_calculated_schedule(car_num), config=config, title=f"Auto #{car_num}")
    res = BytesIO()
    pisa.CreatePDF(BytesIO(html.encode("utf-8")), dest=res)
    response = make_response(res.getvalue())
    response.headers['Content-Type'] = 'application/pdf'
    return response

@app.route('/export/driver/<int:driver_id>')
@login_required
def export_driver_pdf(driver_id):
    driver = db.session.get(Driver, driver_id)
    full_sch = get_calculated_schedule(driver.car_number)
    stints = [s for s in full_sch if s['driver_id'] == driver_id]
    config = RaceConfig.query.first()
    html = render_template('pdf_template.html', schedule=stints, config=config, title=f"Fahrer-Plan: {driver.name}")
    res = BytesIO()
    pisa.CreatePDF(BytesIO(html.encode("utf-8")), dest=res)
    response = make_response(res.getvalue())
    response.headers['Content-Type'] = 'application/pdf'
    return response

# HIER IST DIE FEHLENDE ROUTE
@app.route('/driver/<int:id>')
@login_required
def driver_detail(id):
    driver = db.session.get(Driver, id)
    full_sch = get_calculated_schedule(driver.car_number)
    stints = [s for s in full_sch if s['driver_id'] == id]
    return render_template('driver_detail.html', driver=driver, stints=stints)

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        u = User.query.filter_by(username='mscaltenbach').first()
        if u and check_password_hash(u.password, request.form.get('password')):
            session.permanent = True
            login_user(u, remember=True)
            return redirect(url_for('index'))
    return render_template('login.html')

@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('login'))

if __name__ == '__main__':
    with app.app_context():
        db.create_all()
        if not RaceConfig.query.first(): db.session.add(RaceConfig()); db.session.commit()
        if not User.query.filter_by(username='mscaltenbach').first():
            db.session.add(User(username='mscaltenbach', password=generate_password_hash('SendIt123!', method='pbkdf2:sha256')))
            db.session.commit()
    app.run(host='0.0.0.0', port=5000)