"""
Chat web interface routes
Provides HTML templates and endpoints for web-based chat
"""
from flask import Blueprint, render_template, request, redirect, url_for, flash, jsonify
from flask_login import login_required, current_user
from sqlalchemy import desc, and_
from datetime import datetime, timedelta

from app.extensions import db
from app.models import ChatRoom, ChatMessage, ChatParticipant, Post

# Create blueprint
chat = Blueprint('chat', __name__)

@chat.route('/')
@login_required
def index():
    """Chat main page with room list and rules"""
    # Get user's recent chat rooms
    user_rooms = db.session.query(ChatRoom).join(ChatParticipant).filter(
        and_(
            ChatParticipant.user_id == current_user.id,
            ChatRoom.is_active == True
        )
    ).order_by(desc(ChatRoom.last_activity)).limit(10).all()
    
    # Get public rooms that are active
    public_rooms = ChatRoom.query.filter(
        ChatRoom.is_active == True,
        ChatRoom.is_private == False
    ).order_by(desc(ChatRoom.last_activity)).limit(10).all()
    
    return render_template('chat/index.html', 
                         user_rooms=user_rooms,
                         public_rooms=public_rooms)

@chat.route('/room/<int:room_id>')
@login_required
def room(room_id):
    """Chat room interface"""
    room = ChatRoom.query.get_or_404(room_id)
    
    # Check access
    if room.is_private:
        participant = ChatParticipant.query.filter_by(
            room_id=room_id,
            user_id=current_user.id
        ).first()
        if not participant:
            flash('You do not have access to this chat room.', 'error')
            return redirect(url_for('chat.index'))
    
    # Get or create participant record
    participant = ChatParticipant.query.filter_by(
        room_id=room_id,
        user_id=current_user.id
    ).first()
    
    if not participant and not room.is_private:
        # Auto-join public rooms
        participant = ChatParticipant(
            room_id=room_id,
            user_id=current_user.id,
            role='member'
        )
        db.session.add(participant)
        db.session.commit()
    
    # Get recent messages
    messages = ChatMessage.query.filter_by(
        room_id=room_id,
        is_deleted=False
    ).order_by(ChatMessage.created_at).limit(50).all()
    
    # Get participants
    participants = ChatParticipant.query.filter_by(room_id=room_id).all()
    
    return render_template('chat/room.html',
                         room=room,
                         messages=messages,
                         participants=participants,
                         current_participant=participant)

@chat.route('/create')
@login_required
def create_room_form():
    """Show create room form"""
    # Get available posts for post discussions
    recent_posts = Post.query.filter_by(published=True).order_by(
        desc(Post.created_at)
    ).limit(20).all()
    
    # Check if a specific post was requested
    pre_selected_post = request.args.get('post_id')
    if pre_selected_post:
        try:
            pre_selected_post = int(pre_selected_post)
        except ValueError:
            pre_selected_post = None
    
    return render_template('chat/create_room.html', posts=recent_posts, pre_selected_post=pre_selected_post)


@chat.route('/create', methods=['POST'])
@login_required
def create_room():
    """Create a new chat room"""
    room_name = request.form.get('room_name')
    description = request.form.get('description', '')
    room_type = request.form.get('room_type', 'general')
    is_private = bool(request.form.get('is_private'))
    related_post_id = request.form.get('related_post_id')
    
    if not room_name:
        flash('Room name is required.', 'error')
        return redirect(url_for('chat.create_room_form'))
    
    # Convert to integer if post ID is provided
    if related_post_id:
        try:
            related_post_id = int(related_post_id)
            # Verify the post exists
            related_post = Post.query.get(related_post_id)
            if not related_post:
                flash('Selected post does not exist.', 'error')
                return redirect(url_for('chat.create_room_form'))
            # If post is selected, set room type to post_discussion
            room_type = 'post_discussion'
        except ValueError:
            related_post_id = None
    else:
        related_post_id = None
        # If no post selected, ensure it's general discussion
        if room_type == 'post_discussion':
            room_type = 'general'
    
    # Check if room name already exists
    existing_room = ChatRoom.query.filter_by(name=room_name).first()
    if existing_room:
        flash('A room with that name already exists.', 'error')
        return redirect(url_for('chat.create_room_form'))
    
    try:
        # Create the room
        room = ChatRoom(
            name=room_name,
            description=description,
            room_type=room_type,
            is_private=is_private,
            is_active=True,
            created_by_id=current_user.id,
            related_post_id=related_post_id
        )
        db.session.add(room)
        db.session.flush()  # Get the room ID
        
        # Add creator as participant with admin role
        participant = ChatParticipant(
            room_id=room.id,
            user_id=current_user.id,
            role='admin',
            joined_at=datetime.utcnow()
        )
        db.session.add(participant)
        
        # Add welcome message
        if related_post_id:
            welcome_content = f"Welcome to the discussion for '{related_post.title}'! This room was created by {current_user.nickname} to discuss this post."
        else:
            welcome_content = f"Welcome to {room_name}! This room was created by {current_user.nickname}."
            
        welcome_message = ChatMessage(
            content=welcome_content,
            room_id=room.id,
            sender_id=current_user.id,
            is_system_message=True
        )
        db.session.add(welcome_message)
        
        # Update room activity
        room.last_activity = datetime.utcnow()
        room.message_count = 1
        
        db.session.commit()
        
        if related_post_id:
            flash(f'Chat room "{room_name}" created successfully and linked to the post!', 'success')
        else:
            flash(f'Chat room "{room_name}" created successfully!', 'success')
        return redirect(url_for('chat.room', room_id=room.id))
        
    except Exception as e:
        db.session.rollback()
        flash(f'Error creating room: {str(e)}', 'error')
        return redirect(url_for('chat.create_room_form'))

@chat.route('/support')
@login_required
def support():
    """Admin support page"""
    # Get user's recent support tickets (rooms they created for support)
    recent_tickets = ChatRoom.query.filter(
        ChatRoom.room_type == 'admin_support',
        ChatRoom.created_by_id == current_user.id
    ).order_by(desc(ChatRoom.created_at)).limit(5).all()
    
    return render_template('chat/support.html', 
                         recent_tickets=recent_tickets)

@chat.route('/embed/<int:post_id>')
@login_required
def embed_post_chat(post_id):
    """Embedded chat widget for post pages"""
    post = Post.query.get_or_404(post_id)
    
    # Find existing discussion room
    discussion_room = ChatRoom.query.filter(
        and_(
            ChatRoom.room_type == 'post_discussion',
            ChatRoom.related_post_id == post_id,
            ChatRoom.is_active == True
        )
    ).first()
    
    return render_template('chat/embed.html',
                         post=post,
                         discussion_room=discussion_room)


@chat.route('/post-discussions')
@login_required
def post_discussions():
    """View all chat rooms related to posts"""
    page = request.args.get('page', 1, type=int)
    
    # Get all rooms that are linked to posts
    post_rooms = ChatRoom.query.filter(
        ChatRoom.related_post_id.isnot(None),
        ChatRoom.is_active == True
    ).join(Post).order_by(ChatRoom.last_activity.desc()).paginate(
        page=page, per_page=20, error_out=False
    )
    
    # Get statistics
    total_post_discussions = ChatRoom.query.filter(
        ChatRoom.related_post_id.isnot(None),
        ChatRoom.is_active == True
    ).count()
    
    active_discussions = ChatRoom.query.filter(
        ChatRoom.related_post_id.isnot(None),
        ChatRoom.is_active == True,
        ChatRoom.last_activity >= datetime.utcnow() - timedelta(days=7)
    ).count()
    
    return render_template('chat/post_discussions.html', 
                         rooms=post_rooms,
                         total_discussions=total_post_discussions,
                         active_discussions=active_discussions)


@chat.route('/post/<int:post_id>/discussions')
@login_required
def post_specific_discussions(post_id):
    """View all chat rooms for a specific post"""
    post = Post.query.get_or_404(post_id)
    
    # Get all rooms for this specific post
    rooms = ChatRoom.query.filter(
        ChatRoom.related_post_id == post_id,
        ChatRoom.is_active == True
    ).order_by(ChatRoom.last_activity.desc()).all()
    
    return render_template('chat/post_specific_discussions.html', 
                         post=post, rooms=rooms)