"""
Main Blueprint - Dashboard and Home Routes
"""
from flask import Blueprint, render_template, redirect, url_for
from flask_login import login_required, current_user
from app.extensions import db, cache
from app.models.player import Player
from app.models.playlist import Playlist
from app.models.content import Content
from app.utils.logger import get_recent_logs
import os

main_bp = Blueprint('main', __name__)


@main_bp.route('/')
@login_required
@cache.cached(timeout=60, unless=lambda: current_user.role != 'viewer')
def dashboard():
    """Main dashboard page"""
    # Get statistics
    total_players = Player.query.count()
    total_playlists = Playlist.query.count()
    total_content = Content.query.count()
    
    # Calculate storage usage
    upload_folder = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'static', 'uploads')
    storage_mb = 0
    if os.path.exists(upload_folder):
        for filename in os.listdir(upload_folder):
            filepath = os.path.join(upload_folder, filename)
            if os.path.isfile(filepath):
                storage_mb += os.path.getsize(filepath)
        storage_mb = round(storage_mb / (1024 * 1024), 2)  # Convert to MB
    
    # Recent Activity.
    #
    # Player feedback ("Feedback received from ...") is a ~15s heartbeat: it is
    # ~84% of all log rows, and 18 of the newest 20. Showing it unfiltered
    # buries the events an operator actually cares about (uploads, logins,
    # HTTPS changes, deployments), so the two kinds are queried separately and
    # the card defaults to real activity, with heartbeats available on demand.
    #
    # The split is done in SQL rather than by filtering one wide window in
    # Python: with a fleet of players the heartbeat rate is high enough that a
    # fixed window would return mostly noise and only a handful of real events.
    HEARTBEAT_PREFIX = 'Feedback received from'
    activity_logs = get_recent_logs(25, exclude_prefix=HEARTBEAT_PREFIX)
    heartbeat_logs = get_recent_logs(25, include_prefix=HEARTBEAT_PREFIX)

    # Per-playlist overview for the dashboard: which playlist holds what, and
    # which players consume it. This answers "where should I add media / which
    # playlist needs editing?" without opening each playlist.
    #
    # Players are fetched in a single query and grouped in Python rather than
    # relying on Playlist.players per row, to avoid one query per playlist.
    playlists = Playlist.query.order_by(Playlist.name).all()
    players_by_playlist = {}
    for player in Player.query.order_by(Player.name).all():
        if player.playlist_id is not None:
            players_by_playlist.setdefault(player.playlist_id, []).append(player)

    playlist_overview = []
    for playlist in playlists:
        assigned = players_by_playlist.get(playlist.id, [])
        playlist_overview.append({
            'playlist': playlist,
            'content_count': playlist.contents.count(),
            'total_duration': playlist.total_duration,
            'players': assigned,
            'player_count': len(assigned),
            'online_count': sum(1 for p in assigned if p.is_online),
        })

    # Players with no playlist produce no content on screen, so surface them.
    unassigned_players = Player.query.filter(Player.playlist_id.is_(None))\
        .order_by(Player.name).all()

    return render_template(
        'dashboard.html',
        total_players=total_players,
        total_playlists=total_playlists,
        total_content=total_content,
        storage_mb=storage_mb,
        recent_logs=activity_logs,
        heartbeat_logs=heartbeat_logs,
        playlist_overview=playlist_overview,
        unassigned_players=unassigned_players
    )


@main_bp.route('/help')
@login_required
def help_page():
    """User manual / help page.

    The manual lives at ``app/static/help/_manual_body.html`` — a pre-rendered
    HTML fragment generated from ``documentatie/Manual-Utilizare-DigiServer.md``
    with ``pandoc`` (see ``documentatie/convert_help_page.sh``).

    It is shipped as a static asset rather than parsed at runtime on purpose:
    it keeps the runtime free of a Markdown dependency and means the help page
    renders identically regardless of what is installed in the container.
    """
    import os
    import re

    base_dir = os.path.dirname(os.path.dirname(__file__))  # -> app/
    manual_path = os.path.join(base_dir, 'static', 'help', '_manual_body.html')

    manual_html = ''
    toc = []
    try:
        with open(manual_path, 'r', encoding='utf-8') as f:
            manual_html = f.read()

        # Build the sidebar from the level-2 headings (`<h2 id="...">`), which
        # is exactly the printed table of contents of the manual. Nested <h3>
        # entries would make the sidebar unwieldy, so they are left out.
        for anchor, title in re.findall(
            r'<h2 id="([^"]+)"[^>]*>(.*?)</h2>', manual_html, re.DOTALL
        ):
            clean = re.sub(r'<[^>]+>', '', title).strip()
            if clean:
                toc.append({'anchor': anchor, 'title': clean})
    except FileNotFoundError:
        manual_html = (
            '<h1>Manual indisponibil</h1>'
            '<p>Fișierul manualului nu a fost găsit. '
            'Rulați <code>documentatie/convert_help_page.sh</code> pentru a-l genera.</p>'
        )

    return render_template('help.html', manual_html=manual_html, toc=toc)


@main_bp.route('/health')
def health():
    """Health check endpoint"""
    from flask import jsonify
    import os
    
    try:
        # Check database
        db.session.execute(db.text('SELECT 1'))
        
        # Check disk space
        upload_folder = os.path.join(
            main_bp.root_path or '.',
            'static/uploads'
        )
        
        if os.path.exists(upload_folder):
            stat = os.statvfs(upload_folder)
            free_space_gb = (stat.f_bavail * stat.f_frsize) / (1024**3)
        else:
            free_space_gb = 0
        
        return jsonify({
            'status': 'healthy',
            'database': 'ok',
            'disk_space_gb': round(free_space_gb, 2)
        }), 200
        
    except Exception as e:
        return jsonify({
            'status': 'unhealthy',
            'error': str(e)
        }), 500