import os
import random

from flask import Flask, Blueprint, flash, request, redirect, url_for, current_app, render_template, send_from_directory, g

from werkzeug.utils import secure_filename
from werkzeug.exceptions import abort

from files.auth import admin_required
from files.db import get_db


bp = Blueprint('files', __name__)
bp.add_url_rule('/uploads/<path:filename>', 'uploaded_file', build_only=True)

def get_extension(filename):
    return filename.rsplit('.', 1)[1].lower() 

def get_path_in_upload(filename):
    return os.path.join(current_app.config['UPLOAD_FOLDER'], filename)

def save_file(file, private, category):
    if private is None:
        is_private = 0
    else:
        is_private = 1

    db = get_db()

    filename = secure_filename(file.filename)
    db.execute(
        'INSERT INTO files (filename, private, category)'
        ' VALUES (?,?,?)',
        (filename, is_private, category['id'],)
    )

    file.save(get_path_in_upload(filename))

    db.commit()

    return filename

def _rename_file(file, new_name):
    db = get_db()

    new_name = secure_filename(new_name)
    db.execute(
        'UPDATE files'
        ' SET filename = ?'
        ' WHERE id = ?',
        (new_name, file['id'],)
    )

    os.rename(get_path_in_upload(file['filename']), get_path_in_upload(new_name))

    db.commit()

    return new_name


def _delete_file(file):
    db = get_db()
    db.execute(
        'DELETE from files'
        ' WHERE id = ?',
        (file['id'],)
    )
    
    os.remove(get_path_in_upload(file['filename'])) 
    db.commit()


def get_files():
    db = get_db()
    files = db.execute(
        'SELECT id, filename, private, category'
        ' FROM files'
        ' ORDER BY filename'
    ).fetchall()
    return files

def get_public_files():
    db = get_db()
    files = db.execute(
        'SELECT id, filename, private, category'
        ' FROM files'
        ' WHERE private = false'
        ' ORDER BY filename'
    ).fetchall()

    return files

def get_files_by_category(id):
    db = get_db()
    files = db.execute(
        'SELECT id, filename, private'
        ' FROM files'
        ' WHERE category = ?'
        ' ORDER BY filename',
        (id,)
    ).fetchall()

def get_file(id):
    db = get_db()
    file = db.execute(
        'SELECT id, filename, private, category'
        ' FROM files'
        ' WHERE id = ?'
        ' LIMIT 1',
        (id,)
    ).fetchone()
    return file

def get_categories():
    db = get_db()
    categories = db.execute(
        'SELECT id, name'
        ' FROM categories'
        ' ORDER BY name'
    ).fetchall()
    return categories

def get_category(id):
    db = get_db()
    category = db.execute(
        'SELECT id, name'
        ' FROM categories'
        ' WHERE id = ?'
        ' LIMIT 1',
        (id,)
    ).fetchone()
    return category

@bp.route('/', methods=['GET', 'POST'])             
def index():
    if g.user is None:
        files = get_public_files()
    else: 
        files = get_files()

    return render_template('files/index.html', files=files)

@bp.route('/upload', methods=['GET', 'POST'])
@admin_required
def upload_file():
    db = get_db()

    if request.method == 'POST':
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        else: 
            file = request.files['file']

        if 'private' not in request.form:
            private = None
        else:
            private = request.form['private']

        if 'category' not in request.form:
            flash('No category selected')
            return redirect(request.url)
        else:
            category = get_category(request.form['category'])

        if file.filename == '':
            flash('No seleted file')
            return redirect(request.url)

        if file:
            filename = save_file(file, private, category)
            return redirect(url_for('files.index'))
    
    return render_template('files/upload.html', categories=get_categories())

@bp.route('/preview/<int:id>')
def preview_file(id):
    file = get_file(id)
    if (file['private'] == 1 and g.user is not None) or (file['private'] == 0):
        return render_template('files/preview.html', file=file)
    else:
        return abort(404)


@bp.route('/rename/<int:id>', methods=['POST'])
@admin_required
def rename_file(id):
    if request.method == 'POST':
        file = get_file(id)

        new_name = request.form['new_name'].lower()
        extension = file['filename'].rsplit('.', 1)[1].lower()

        if "." in new_name and get_extension(new_name):
            new_name = new_name.rsplit('.',1)[0] + '.' + extension
        else:
            new_name = new_name + '.' + extension
        
        _rename_file(file, new_name)
        
        return redirect(url_for('files.preview_file', id=file['id'])) 

@bp.route('/delete/<int:id>', methods=['POST'])
@admin_required
def delete_file(id):
    if request.method == 'POST':
        file = get_file(id)
        print(file)
        _delete_file(file)
        return redirect(url_for('index'))
    else:
        abort(404)