from flask import Flask, render_template, request, redirect, url_for, session, abort, jsonify
from datetime import datetime, timedelta
import numpy as np
from dateutil.relativedelta import relativedelta
import os
import time

app_start_time = time.time()

app = Flask(__name__)
app.secret_key = os.environ.get('SECRET_KEY', 'dev-key')

# HTML-Template wird jetzt aus templates/index.html geladen

WOCHENTAGE = ["Montag", "Dienstag", "Mittwoch", "Donnerstag", "Freitag", "Samstag", "Sonntag"]

@app.route('/', methods=['GET', 'POST'])
def index():
    # Rudimentäres Logging für Page Impressions
    log_dir = 'log'
    os.makedirs(log_dir, exist_ok=True)
    log_path = os.path.join(log_dir, 'pageviews.log')
    # Logfile bereinigen: nur Zeilen der letzten 7 Tage behalten
    if os.path.exists(log_path):
        now = datetime.now()
        lines_new = []
        with open(log_path, encoding='utf-8') as f:
            for line in f:
                try:
                    date_str = line[:10]
                    date = datetime.strptime(date_str, '%Y-%m-%d')
                    if (now - date).days <= 7:
                        lines_new.append(line)
                except Exception:
                    # Zeile ohne Datum behalten (zur Sicherheit)
                    lines_new.append(line)
        with open(log_path, 'w', encoding='utf-8') as f:
            f.writelines(lines_new)
    with open(log_path, 'a', encoding='utf-8') as f:
        from datetime import datetime as dt
        f.write(f"{dt.now().isoformat()} PAGEVIEW\n")
    tage = werktage = wochentag = datumsrechnung = werktagsrechnung = kw_berechnen = kw_datum = wochen_monate = None
    active_idx = 0
    plusminus_result = None
    if request.method == 'POST':
        action = request.form.get('action')
        # Funktions-Logging
        with open(log_path, 'a', encoding='utf-8') as f:
            from datetime import datetime as dt
            f.write(f"{dt.now().isoformat()} FUNC: {action}\n")
        if action == 'tage_werktage':
            active_idx = 0
            start = request.form.get('start1')
            end = request.form.get('end1')
            is_werktage = request.form.get('werktage') in ('on', 'true', '1', True)
            try:
                d1 = datetime.strptime(start, '%Y-%m-%d')
                d2 = datetime.strptime(end, '%Y-%m-%d')
                if is_werktage:
                    if d1 > d2:
                        d1, d2 = d2, d1
                    tage = np.busday_count(d1.date(), (d2 + timedelta(days=1)).date())
                else:
                    tage = abs((d2 - d1).days)
            except Exception:
                tage = 'Ungültige Eingabe'
        elif action == 'wochentag':
            active_idx = 1
            datum = request.form.get('datum3')
            try:
                d = datetime.strptime(datum, '%Y-%m-%d')
                wochentag = WOCHENTAGE[d.weekday()]
            except Exception:
                wochentag = 'Ungültige Eingabe'
        elif action == 'kw_berechnen':
            active_idx = 2
            datum = request.form.get('datum6')
            try:
                d = datetime.strptime(datum, '%Y-%m-%d')
                kw = d.isocalendar().week
                kw_berechnen = f"KW {kw} ({d.year})"
            except Exception:
                kw_berechnen = 'Ungültige Eingabe'
        elif action == 'kw_datum':
            active_idx = 3
            jahr = request.form.get('jahr7')
            kw = request.form.get('kw7')
            try:
                jahr = int(jahr)
                kw = int(kw)
                # Montag der KW
                start = datetime.fromisocalendar(jahr, kw, 1)
                end = datetime.fromisocalendar(jahr, kw, 7)
                kw_datum = f"{start.strftime('%d.%m.%Y')} bis {end.strftime('%d.%m.%Y')}"
            except Exception:
                kw_datum = 'Ungültige Eingabe'
        elif action == 'plusminus':
            active_idx = 4
            datum = request.form.get('datum_pm')
            anzahl = request.form.get('anzahl_pm')
            einheit = request.form.get('einheit_pm')
            richtung = request.form.get('richtung_pm')
            is_werktage = request.form.get('werktage_pm') in ('on', 'true', '1', True)
            try:
                d = datetime.strptime(datum, '%Y-%m-%d')
                anzahl_int = int(anzahl)
                if richtung == 'sub':
                    anzahl_int = -anzahl_int
                if einheit == 'tage':
                    if is_werktage:
                        # Werktage: numpy busday_offset
                        result = np.busday_offset(d.date(), anzahl_int, roll='forward')
                        result_dt = datetime.strptime(str(result), '%Y-%m-%d')
                        plusminus_result = f"Datum {d.strftime('%d.%m.%Y')} {'plus' if anzahl_int>=0 else 'minus'} {abs(anzahl_int)} Werktage: {result_dt.strftime('%d.%m.%Y')}"
                    else:
                        result = d + timedelta(days=anzahl_int)
                        plusminus_result = f"Datum {d.strftime('%d.%m.%Y')} {'plus' if anzahl_int>=0 else 'minus'} {abs(anzahl_int)} Tage: {result.strftime('%d.%m.%Y')}"
                elif einheit == 'wochen':
                    if is_werktage:
                        plusminus_result = 'Nicht unterstützt: Werktage + Wochen.'
                    else:
                        result = d + timedelta(weeks=anzahl_int)
                        plusminus_result = f"Datum {d.strftime('%d.%m.%Y')} {'plus' if anzahl_int>=0 else 'minus'} {abs(anzahl_int)} Wochen: {result.strftime('%d.%m.%Y')}"
                elif einheit == 'monate':
                    if is_werktage:
                        plusminus_result = 'Nicht unterstützt: Werktage + Monate.'
                    else:
                        result = d + relativedelta(months=anzahl_int)
                        plusminus_result = f"Datum {d.strftime('%d.%m.%Y')} {'plus' if anzahl_int>=0 else 'minus'} {abs(anzahl_int)} Monate: {result.strftime('%d.%m.%Y')}"
            except Exception:
                plusminus_result = 'Ungültige Eingabe'
    return render_template('index.html', tage=tage, werktage=werktage, wochentag=wochentag, plusminus_result=plusminus_result, kw_berechnen=kw_berechnen, kw_datum=kw_datum, active_idx=active_idx)


def parse_log_stats(log_path):
    pageviews = 0
    func_counts = {}
    impressions_per_day = {}
    api_counts = {}
    if os.path.exists(log_path):
        with open(log_path, encoding='utf-8') as f:
            for line in f:
                if 'PAGEVIEW' in line:
                    pageviews += 1
                    try:
                        date = line[:10]
                        if len(date) == 10 and date[4] == '-' and date[7] == '-':
                            impressions_per_day[date] = impressions_per_day.get(date, 0) + 1
                    except Exception:
                        pass
                elif 'FUNC:' in line:
                    func = line.split('FUNC:')[1].strip()
                    func_counts[func] = func_counts.get(func, 0) + 1
                elif 'FUNC_API:' in line:
                    api = line.split('FUNC_API:')[1].strip()
                    api_counts[api] = api_counts.get(api, 0) + 1
    return pageviews, func_counts, impressions_per_day, api_counts

@app.route('/stats', methods=['GET', 'POST'])
def stats():
    stats_password = os.environ.get('STATS_PASSWORD', 'changeme')
    if 'stats_auth' not in session:
        if request.method == 'POST':
            if request.form.get('password') == stats_password:
                session['stats_auth'] = True
                return redirect(url_for('stats'))
            else:
                return render_template('stats_login.html', error='Falsches Passwort!')
        return render_template('stats_login.html', error=None)
    log_path = os.path.join('log', 'pageviews.log')
    pageviews, func_counts, impressions_per_day, api_counts = parse_log_stats(log_path)
    return render_template('stats_dashboard.html', pageviews=pageviews, func_counts=func_counts, impressions_per_day=impressions_per_day, api_counts=api_counts)

# --- REST API ---
def log_api_usage(api_name):
    log_dir = 'log'
    os.makedirs(log_dir, exist_ok=True)
    log_path = os.path.join(log_dir, 'pageviews.log')
    from datetime import datetime as dt
    with open(log_path, 'a', encoding='utf-8') as f:
        f.write(f"{dt.now().isoformat()} FUNC_API: {api_name}\n")

@app.route('/api/tage_werktage', methods=['POST'])
def api_tage_werktage():
    log_api_usage('tage_werktage')
    data = request.get_json()
    start = data.get('start')
    end = data.get('end')
    is_werktage = data.get('werktage', False)
    try:
        d1 = datetime.strptime(start, '%Y-%m-%d')
        d2 = datetime.strptime(end, '%Y-%m-%d')
        if is_werktage:
            if d1 > d2:
                d1, d2 = d2, d1
            tage = int(np.busday_count(d1.date(), (d2 + timedelta(days=1)).date()))
        else:
            tage = abs((d2 - d1).days)
        return jsonify({'result': tage})
    except Exception as e:
        return jsonify({'error': 'Ungültige Eingabe', 'details': str(e)}), 400

@app.route('/api/wochentag', methods=['POST'])
def api_wochentag():
    log_api_usage('wochentag')
    data = request.get_json()
    datum = data.get('datum')
    try:
        d = datetime.strptime(datum, '%Y-%m-%d')
        wochentag = WOCHENTAGE[d.weekday()]
        return jsonify({'result': wochentag})
    except Exception as e:
        return jsonify({'error': 'Ungültige Eingabe', 'details': str(e)}), 400

@app.route('/api/kw_berechnen', methods=['POST'])
def api_kw_berechnen():
    log_api_usage('kw_berechnen')
    data = request.get_json()
    datum = data.get('datum')
    try:
        d = datetime.strptime(datum, '%Y-%m-%d')
        kw = d.isocalendar().week
        return jsonify({'result': f"KW {kw} ({d.year})", 'kw': kw, 'jahr': d.year})
    except Exception as e:
        return jsonify({'error': 'Ungültige Eingabe', 'details': str(e)}), 400

@app.route('/api/kw_datum', methods=['POST'])
def api_kw_datum():
    log_api_usage('kw_datum')
    data = request.get_json()
    jahr = data.get('jahr')
    kw = data.get('kw')
    try:
        jahr = int(jahr)
        kw = int(kw)
        start = datetime.fromisocalendar(jahr, kw, 1)
        end = datetime.fromisocalendar(jahr, kw, 7)
        return jsonify({'result': f"{start.strftime('%d.%m.%Y')} bis {end.strftime('%d.%m.%Y')}", 'start': start.strftime('%Y-%m-%d'), 'end': end.strftime('%Y-%m-%d')})
    except Exception as e:
        return jsonify({'error': 'Ungültige Eingabe', 'details': str(e)}), 400

@app.route('/api/plusminus', methods=['POST'])
def api_plusminus():
    log_api_usage('plusminus')
    data = request.get_json()
    datum = data.get('datum')
    anzahl = data.get('anzahl')
    einheit = data.get('einheit')
    richtung = data.get('richtung', 'add')
    is_werktage = data.get('werktage', False)
    try:
        d = datetime.strptime(datum, '%Y-%m-%d')
        anzahl_int = int(anzahl)
        if richtung == 'sub':
            anzahl_int = -anzahl_int
        if einheit == 'tage':
            if is_werktage:
                result = np.busday_offset(d.date(), anzahl_int, roll='forward')
                result_dt = datetime.strptime(str(result), '%Y-%m-%d')
                return jsonify({'result': result_dt.strftime('%Y-%m-%d')})
            else:
                result = d + timedelta(days=anzahl_int)
                return jsonify({'result': result.strftime('%Y-%m-%d')})
        elif einheit == 'wochen':
            if is_werktage:
                return jsonify({'error': 'Nicht unterstützt: Werktage + Wochen.'}), 400
            else:
                result = d + timedelta(weeks=anzahl_int)
                return jsonify({'result': result.strftime('%Y-%m-%d')})
        elif einheit == 'monate':
            if is_werktage:
                return jsonify({'error': 'Nicht unterstützt: Werktage + Monate.'}), 400
            else:
                result = d + relativedelta(months=anzahl_int)
                return jsonify({'result': result.strftime('%Y-%m-%d')})
        else:
            return jsonify({'error': 'Ungültige Einheit'}), 400
    except Exception as e:
        return jsonify({'error': 'Ungültige Eingabe', 'details': str(e)}), 400

@app.route('/api/stats', methods=['GET'])
def api_stats():
    log_path = os.path.join('log', 'pageviews.log')
    pageviews, func_counts, impressions_per_day, api_counts = parse_log_stats(log_path)
    return render_template('stats_dashboard.html', pageviews=pageviews, func_counts=func_counts, impressions_per_day=impressions_per_day, api_counts=api_counts)

@app.route('/api/monitor', methods=['GET'])
def api_monitor():
    log_path = os.path.join('log', 'pageviews.log')
    pageviews = 0
    if os.path.exists(log_path):
        with open(log_path, encoding='utf-8') as f:
            for line in f:
                if 'PAGEVIEW' in line:
                    pageviews += 1
    uptime = int(time.time() - app_start_time)
    return jsonify({
        "status": "ok",
        "message": "App running",
        "time": datetime.now().isoformat(),
        "uptime_seconds": uptime,
        "pageviews_last_7_days": pageviews
    })

@app.route('/api-docs')
def api_docs():
    return render_template('swagger.html')


if __name__ == '__main__':
    app.run(debug=True, host="0.0.0.0")