import os
import json
from datetime import date, timedelta, datetime

from flask import Flask, render_template, request, jsonify, session, redirect, url_for
from apscheduler.schedulers.background import BackgroundScheduler
import pytz

import database as db
import logger as flog
import openrouter
import rss_fetcher
from wordpress import WordPressClient

app = Flask(__name__)
app.secret_key = os.environ.get('SECRET_KEY', os.urandom(24))

DASHBOARD_USER = os.environ.get('DASHBOARD_USER', 'admin')
DASHBOARD_PASSWORD = os.environ.get('DASHBOARD_PASSWORD', 'changeme')
TIMEZONE = os.environ.get('TIMEZONE', 'Europe/Berlin')
TZ = pytz.timezone(TIMEZONE)

TELEGRAM_BOT_TOKEN = os.environ.get('TELEGRAM_BOT_TOKEN', '')
TELEGRAM_CHANNEL_ID = os.environ.get('TELEGRAM_CHANNEL_ID', '')
TELEGRAM_REVIEWER_IDS = [
    i.strip() for i in os.environ.get('TELEGRAM_REVIEWER_IDS', '').split(',') if i.strip()
]


# ── Scheduler ─────────────────────────────────────────────────────────────────

def job_publish_due():
    articles = db.get_due_articles()
    for art in articles:
        try:
            wp = WordPressClient()
            media_id = None
            if art.get('featured_image_url'):
                media_id = wp.upload_media(art['featured_image_url'])

            result = wp.create_post(
                title=art['title'] or 'Ohne Titel',
                content=art['content'] or '',
                status='publish',
                category_ids=[art['category_id']] if art.get('category_id') else [],
                featured_media_id=media_id,
                seo_title=art.get('seo_title'),
                seo_description=art.get('seo_description'),
                focus_keyword=art.get('focus_keyword'),
            )
            db.update_article(art['id'], {
                'status': 'published',
                'wp_post_id': result['id'],
                'wp_url': result['url'],
                'published_at': datetime.utcnow().isoformat(),
            })
            db.save_post_history(art['id'], result['id'], result['url'])
            flog.info('article_published', article_id=art['id'], wp_url=result['url'])

            if art.get('send_to_telegram') and art.get('article_type') == 'ki':
                _send_telegram_teaser(art, result['url'])

        except Exception as e:
            flog.error('publish_failed', article_id=art['id'], error=str(e))
            _send_error_alarm(f"❌ Publish fehlgeschlagen: Artikel #{art['id']}\n{str(e)}")


def job_fetch_feeds():
    rss_fetcher.run_all_feeds()


def job_cleanup_db():
    """Woechentliche DB-Bereinigung: alte Feed-Items und Post-History loeschen."""
    import sqlite3, os
    db_path = os.environ.get('DB_PATH', '/data/redax.db')
    con = sqlite3.connect(db_path)
    r1 = con.execute(
        "DELETE FROM feed_items WHERE status IN ('published', 'rejected') "
        "AND fetched_at < datetime('now', '-60 days')"
    ).rowcount
    r2 = con.execute(
        "DELETE FROM feed_items WHERE status = 'new' "
        "AND fetched_at < datetime('now', '-30 days')"
    ).rowcount
    r3 = con.execute("DELETE FROM post_history WHERE posted_at < datetime('now', '-90 days')").rowcount
    con.execute("VACUUM")
    con.commit()
    con.close()
    flog.info('db_cleanup', fi_processed=r1, fi_stale=r2, ph_del=r3)


def job_morning_briefing():
    today = date.today().strftime('%Y-%m-%d')
    tomorrow = (date.today() + timedelta(days=1)).strftime('%Y-%m-%d')
    today_arts = db.get_articles_for_date(today)
    tomorrow_arts = db.get_articles_for_date(tomorrow)
    queue = db.get_feed_queue(status='new', limit=10)

    lines = ["📰 *Morgen-Briefing Redax-WP*\n"]
    lines.append(f"*Heute ({today}):* {len(today_arts)} Artikel geplant")
    for a in today_arts:
        status_icon = {'published': '✅', 'scheduled': '🗓️', 'draft': '📝'}.get(a['status'], '❓')
        lines.append(f"  {status_icon} {a['post_time']} — {(a['title'] or 'Kein Titel')[:50]}")

    lines.append(f"\n*Morgen ({tomorrow}):* {len(tomorrow_arts)} Artikel")
    lines.append(f"*RSS-Queue:* {len(queue)} neue Artikel warten")

    msg = '\n'.join(lines)
    for chat_id in TELEGRAM_REVIEWER_IDS:
        _tg_send(chat_id, msg, parse_mode='Markdown')


def _send_telegram_teaser(article: dict, wp_url: str):
    title = article.get('title', '')
    seo_desc = article.get('seo_description', '')
    teaser = seo_desc[:200] if seo_desc else ''
    msg = f"📰 *{title}*\n\n{teaser}\n\n🔗 {wp_url}"
    _tg_send(TELEGRAM_CHANNEL_ID, msg, parse_mode='Markdown')


def _send_error_alarm(message: str):
    for chat_id in TELEGRAM_REVIEWER_IDS:
        _tg_send(chat_id, f"🚨 *Redax-WP Fehler*\n{message}", parse_mode='Markdown')


def _tg_send(chat_id: str, text: str, parse_mode: str = None):
    if not TELEGRAM_BOT_TOKEN or not chat_id:
        return
    import requests as req
    try:
        req.post(
            f"https://api.telegram.org/bot{TELEGRAM_BOT_TOKEN}/sendMessage",
            json={'chat_id': chat_id, 'text': text, 'parse_mode': parse_mode},
            timeout=10
        )
    except Exception as e:
        flog.error('tg_send_failed', error=str(e))


# ── Auth ──────────────────────────────────────────────────────────────────────

def logged_in():
    return session.get('user') == DASHBOARD_USER


@app.before_request
def require_login():
    open_routes = ['login', 'static']
    if request.endpoint not in open_routes and not logged_in():
        return redirect(url_for('login'))


@app.route('/login', methods=['GET', 'POST'])
def login():
    error = None
    if request.method == 'POST':
        if request.form.get('user') == DASHBOARD_USER and \
           request.form.get('password') == DASHBOARD_PASSWORD:
            session['user'] = DASHBOARD_USER
            return redirect(url_for('index'))
        error = 'Falsche Zugangsdaten'
    return render_template('login.html', error=error)


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


# ── Main Dashboard ─────────────────────────────────────────────────────────────

@app.route('/')
def index():
    today = date.today().strftime('%Y-%m-%d')
    plan_days = [(date.today() + timedelta(days=i)).strftime('%Y-%m-%d') for i in range(7)]

    plan_raw = db.get_week_articles(plan_days[0], plan_days[-1])
    plan_articles = {}
    for a in plan_raw:
        plan_articles.setdefault(a['post_date'], []).append(a)

    wp_categories = []
    try:
        wp = WordPressClient()
        if wp.is_reachable():
            wp_categories = wp.get_categories()
    except Exception:
        pass

    last_published = db.get_last_published()
    feeds = db.get_feeds()
    queue_count = len(db.get_feed_queue(status='new'))
    prompts = db.get_prompts()

    return render_template('index.html',
                           today=today,
                           plan_days=plan_days,
                           plan_articles=plan_articles,
                           wp_categories=wp_categories,
                           last_published=last_published,
                           feeds=feeds,
                           queue_count=queue_count,
                           prompts=prompts)


# ── API: Artikel ──────────────────────────────────────────────────────────────

@app.route('/api/generate', methods=['POST'])
def api_generate():
    data = request.json
    source = data.get('source', '')
    tone = data.get('tone', 'informativ')

    prompt = db.get_default_prompt()
    if not prompt:
        return jsonify({'error': 'Kein Prompt konfiguriert'}), 400

    system = prompt['system_prompt']
    system = system.replace('{tone}', tone).replace('{date}', date.today().strftime('%d.%m.%Y'))

    try:
        raw = openrouter.generate(system, source)
        content, seo_title, seo_desc, keyword = rss_fetcher._parse_ki_output(raw)

        # Erste Zeile als Titel extrahieren
        lines = content.strip().split('\n')
        title = lines[0].lstrip('#').strip() if lines else ''
        content_body = '\n'.join(lines[1:]).strip() if len(lines) > 1 else content

        flog.info('article_generated', tone=tone)
        return jsonify({
            'title': title,
            'content': content_body,
            'seo_title': seo_title,
            'seo_description': seo_desc,
            'focus_keyword': keyword,
        })
    except Exception as e:
        flog.error('generate_failed', error=str(e))
        return jsonify({'error': str(e)}), 500


@app.route('/api/article/save', methods=['POST'])
def api_save_article():
    data = request.json
    article_id = data.get('id')
    if article_id:
        db.update_article(article_id, data)
    else:
        article_id = db.create_article({**data, 'article_type': 'ki', 'status': 'draft'})
    flog.info('article_saved', article_id=article_id)
    return jsonify({'success': True, 'id': article_id})


@app.route('/api/article/schedule', methods=['POST'])
def api_schedule_article():
    data = request.json
    article_id = data.get('id')
    post_date = data.get('post_date')
    post_time = data.get('post_time')
    send_to_telegram = 1 if data.get('article_type', 'ki') == 'ki' else 0

    if article_id:
        db.update_article(article_id, {
            'post_date': post_date,
            'post_time': post_time,
            'status': 'scheduled',
            'send_to_telegram': send_to_telegram,
        })
    else:
        article_id = db.create_article({
            **data,
            'article_type': 'ki',
            'status': 'scheduled',
            'send_to_telegram': send_to_telegram,
        })

    flog.info('article_scheduled', article_id=article_id, date=post_date, time=post_time)
    return jsonify({'success': True, 'id': article_id})


@app.route('/api/article/<int:article_id>/reschedule', methods=['POST'])
def api_reschedule(article_id):
    data = request.json
    ok, msg = db.reschedule_article(article_id, data['post_date'], data['post_time'])
    return jsonify({'success': ok, 'error': msg if not ok else None})


@app.route('/api/article/<int:article_id>/delete', methods=['POST'])
def api_delete_article(article_id):
    db.delete_article(article_id)
    flog.info('article_deleted', article_id=article_id)
    return jsonify({'success': True})


@app.route('/api/article/<int:article_id>', methods=['GET'])
def api_get_article(article_id):
    art = db.get_article(article_id)
    if not art:
        return jsonify({'error': 'Not found'}), 404
    return jsonify(art)


@app.route('/api/slots/<date_str>')
def api_slots(date_str):
    return jsonify({'taken': db.get_taken_slots(date_str)})


@app.route('/api/og-image', methods=['POST'])
def api_og_image():
    url = request.json.get('url', '')
    image = rss_fetcher._extract_og_image(url)
    return jsonify({'image': image})


@app.route('/api/wp/categories')
def api_wp_categories():
    try:
        wp = WordPressClient()
        return jsonify(wp.get_categories())
    except Exception as e:
        return jsonify({'error': str(e)}), 500


# ── API: Feeds ────────────────────────────────────────────────────────────────

@app.route('/feeds')
def feeds_page():
    feeds = db.get_feeds()
    queue = db.get_feed_queue(status='new', limit=30)
    return render_template('feeds.html', feeds=feeds, queue=queue)


@app.route('/api/feeds', methods=['GET'])
def api_get_feeds():
    return jsonify(db.get_feeds())


@app.route('/api/feeds/add', methods=['POST'])
def api_add_feed():
    data = request.json
    fid = db.create_feed(data)
    flog.info('feed_added', feed_id=fid, name=data.get('name'))
    return jsonify({'success': True, 'id': fid})


@app.route('/api/feeds/<int:feed_id>/update', methods=['POST'])
def api_update_feed(feed_id):
    db.update_feed(feed_id, request.json)
    return jsonify({'success': True})


@app.route('/api/feeds/<int:feed_id>/delete', methods=['POST'])
def api_delete_feed(feed_id):
    db.delete_feed(feed_id)
    flog.info('feed_deleted', feed_id=feed_id)
    return jsonify({'success': True})


@app.route('/api/feeds/<int:feed_id>/fetch', methods=['POST'])
def api_fetch_feed(feed_id):
    feed = db.get_feed(feed_id)
    if not feed:
        return jsonify({'error': 'Feed not found'}), 404
    count = rss_fetcher.fetch_feed(feed)
    return jsonify({'success': True, 'new_items': count})


@app.route('/api/queue/<int:item_id>/approve', methods=['POST'])
def api_approve_queue_item(item_id):
    items = db.get_feed_queue(status='new')
    item = next((i for i in items if i['id'] == item_id), None)
    if not item:
        return jsonify({'error': 'Item not found'}), 404
    feed = db.get_feed(item['feed_id'])
    article_id = rss_fetcher.process_auto_publish(feed, item)
    return jsonify({'success': True, 'article_id': article_id})


@app.route('/api/queue/<int:item_id>/reject', methods=['POST'])
def api_reject_queue_item(item_id):
    db.update_feed_item_status(item_id, 'rejected')
    return jsonify({'success': True})


# ── Prompts ───────────────────────────────────────────────────────────────────

@app.route('/prompts')
def prompts_page():
    return render_template('prompts.html', prompts=db.get_prompts())


@app.route('/api/prompts/save', methods=['POST'])
def api_save_prompt():
    data = request.json
    conn = db.get_conn()
    if data.get('id'):
        conn.execute(
            "UPDATE prompts SET name=?, system_prompt=? WHERE id=?",
            (data['name'], data['system_prompt'], data['id'])
        )
    else:
        conn.execute(
            "INSERT INTO prompts (name, system_prompt) VALUES (?,?)",
            (data['name'], data['system_prompt'])
        )
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/prompts/<int:pid>/default', methods=['POST'])
def api_set_default_prompt(pid):
    conn = db.get_conn()
    conn.execute("UPDATE prompts SET is_default=0")
    conn.execute("UPDATE prompts SET is_default=1 WHERE id=?", (pid,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


@app.route('/api/prompts/<int:pid>/delete', methods=['POST'])
def api_delete_prompt(pid):
    conn = db.get_conn()
    conn.execute("DELETE FROM prompts WHERE id=? AND is_default=0", (pid,))
    conn.commit()
    conn.close()
    return jsonify({'success': True})


# ── History ───────────────────────────────────────────────────────────────────

@app.route('/history')
def history():
    articles = db.get_articles(limit=50, status='published')
    return render_template('history.html', articles=articles)


# ── Settings ──────────────────────────────────────────────────────────────────

@app.route('/settings')
def settings():
    return render_template('settings.html',
                           wp_url=os.environ.get('WP_URL', ''),
                           wp_username=os.environ.get('WP_USERNAME', ''),
                           timezone=TIMEZONE)


# ── Hilfe ─────────────────────────────────────────────────────────────────────

@app.route('/hilfe')
def hilfe():
    return render_template('hilfe.html')


# ── Startup ───────────────────────────────────────────────────────────────────

def start_scheduler():
    scheduler = BackgroundScheduler(timezone=TZ)
    # Artikel-Publishing: jede Minute prüfen
    scheduler.add_job(job_publish_due, 'interval', minutes=1, id='publish_due')
    # RSS-Feeds: alle 30 Minuten
    scheduler.add_job(job_fetch_feeds, 'interval', minutes=30, id='fetch_feeds')
    # Morgen-Briefing: täglich 10:00
    scheduler.add_job(job_morning_briefing, 'cron', hour=10, minute=0, id='morning_briefing')
    # Woechentliche DB-Bereinigung (Sonntags 03:00 Uhr)
    scheduler.add_job(job_cleanup_db, 'cron', day_of_week='sun', hour=3, minute=0, id='db_cleanup')
    scheduler.start()
    flog.info('scheduler_started')


db.init_db()
start_scheduler()
flog.info('app_started')

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080, debug=False)