from flask import Blueprint, render_template, request, redirect, url_for, flash, current_app, jsonify
from flask_login import login_required, current_user
from app.models import Post, PostImage, GPXFile, User, Comment, Like, db
from app.forms import PostForm, CommentForm
from werkzeug.utils import secure_filename
from werkzeug.exceptions import RequestEntityTooLarge
import os
import uuid
from datetime import datetime
from PIL import Image
import gpxpy

community = Blueprint('community', __name__)

@community.route('/')
def index():
    """Community posts listing page"""
    page = request.args.get('page', 1, type=int)
    posts = Post.query.filter_by(published=True).order_by(Post.created_at.desc()).paginate(
        page=page, per_page=10, error_out=False
    )
    return render_template('community/index.html', posts=posts)

@community.route('/post/<int:id>')
def post_detail(id):
    """Individual post detail page"""
    post = Post.query.get_or_404(id)
    if not post.published and (not current_user.is_authenticated or 
                               (current_user.id != post.author_id and not current_user.is_admin)):
        flash('Post not found.', 'error')
        return redirect(url_for('community.index'))
    
    form = CommentForm()
    comments = Comment.query.filter_by(post_id=id).order_by(Comment.created_at.asc()).all()
    
    return render_template('community/post_detail.html', post=post, form=form, comments=comments)

@community.route('/new-post', methods=['GET', 'POST'])
@login_required
def new_post():
    """Create new post page"""
    form = PostForm()
    
    if form.validate_on_submit():
        try:
            # Create post
            post = Post(
                title=form.title.data,
                subtitle=form.subtitle.data,
                content=form.content.data,
                difficulty=int(form.difficulty.data),
                published=form.published.data,
                author_id=current_user.id
            )
            
            db.session.add(post)
            db.session.flush()  # Get the post ID
            
            # Handle image uploads
            if form.images.data and form.images.data.filename:
                images = request.files.getlist('images')
                for image_file in images:
                    if image_file and image_file.filename:
                        result = save_image(image_file, post.id)
                        if result['success']:
                            post_image = PostImage(
                                filename=result['filename'],
                                original_name=image_file.filename,
                                size=result['size'],
                                mime_type=image_file.content_type,
                                post_id=post.id
                            )
                            db.session.add(post_image)
            
            # Handle GPX file upload
            if form.gpx_file.data and form.gpx_file.data.filename:
                result = save_gpx_file(form.gpx_file.data, post.id)
                if result['success']:
                    gpx_file = GPXFile(
                        filename=result['filename'],
                        original_name=form.gpx_file.data.filename,
                        size=result['size'],
                        post_id=post.id
                    )
                    db.session.add(gpx_file)
            
            db.session.commit()
            flash('Your adventure has been shared!', 'success')
            return redirect(url_for('community.post_detail', id=post.id))
            
        except Exception as e:
            db.session.rollback()
            flash('An error occurred while creating your post. Please try again.', 'error')
            current_app.logger.error(f'Error creating post: {str(e)}')
    
    return render_template('community/new_post.html', form=form)

@community.route('/post/<int:id>/comment', methods=['POST'])
@login_required
def add_comment(id):
    """Add comment to post"""
    post = Post.query.get_or_404(id)
    form = CommentForm()
    
    if form.validate_on_submit():
        comment = Comment(
            content=form.content.data,
            author_id=current_user.id,
            post_id=post.id
        )
        db.session.add(comment)
        db.session.commit()
        flash('Your comment has been added.', 'success')
    
    return redirect(url_for('community.post_detail', id=id))

@community.route('/post/<int:id>/like', methods=['POST'])
@login_required
def toggle_like(id):
    """Toggle like on post"""
    post = Post.query.get_or_404(id)
    existing_like = Like.query.filter_by(user_id=current_user.id, post_id=post.id).first()
    
    if existing_like:
        db.session.delete(existing_like)
        liked = False
    else:
        like = Like(user_id=current_user.id, post_id=post.id)
        db.session.add(like)
        liked = True
    
    db.session.commit()
    return jsonify({'liked': liked, 'count': post.get_like_count()})

def save_image(image_file, post_id):
    """Save uploaded image file"""
    try:
        # Create upload directory
        upload_dir = os.path.join(current_app.instance_path, 'uploads', 'images')
        os.makedirs(upload_dir, exist_ok=True)
        
        # Generate unique filename
        filename = secure_filename(f"{uuid.uuid4().hex}_{image_file.filename}")
        filepath = os.path.join(upload_dir, filename)
        
        # Save and resize image
        image = Image.open(image_file)
        if image.mode in ('RGBA', 'LA', 'P'):
            image = image.convert('RGB')
        
        # Resize if too large
        max_size = (1920, 1080)
        image.thumbnail(max_size, Image.Resampling.LANCZOS)
        image.save(filepath, 'JPEG', quality=85, optimize=True)
        
        file_size = os.path.getsize(filepath)
        
        return {
            'success': True,
            'filename': filename,
            'size': file_size
        }
    except Exception as e:
        current_app.logger.error(f'Error saving image: {str(e)}')
        return {'success': False, 'error': str(e)}

def save_gpx_file(gpx_file, post_id):
    """Save uploaded GPX file"""
    try:
        # Create upload directory
        upload_dir = os.path.join(current_app.instance_path, 'uploads', 'gpx')
        os.makedirs(upload_dir, exist_ok=True)
        
        # Generate unique filename
        filename = secure_filename(f"{uuid.uuid4().hex}_{gpx_file.filename}")
        filepath = os.path.join(upload_dir, filename)
        
        # Validate GPX file
        gpx_content = gpx_file.read()
        gpx = gpxpy.parse(gpx_content.decode('utf-8'))
        
        # Save file
        with open(filepath, 'wb') as f:
            f.write(gpx_content)
        
        file_size = len(gpx_content)
        
        return {
            'success': True,
            'filename': filename,
            'size': file_size
        }
    except Exception as e:
        current_app.logger.error(f'Error saving GPX file: {str(e)}')
        return {'success': False, 'error': str(e)}