from flask import request, Blueprint
from flask_restful import Resource, Api
from os import path, remove, walk, mkdir
import logging
import re
from models.config import CONTENT_DIR, STATIC_DIR


contents_app = Blueprint('contents', __name__)
api = Api(contents_app)
logger = logging.getLogger(__name__)
DATA_FIELD = ['title:', 'url:']


def _get_data(file_dir):
    def load_data():
        if 'title:' in line:
            data_field.remove('title:')
            s = line.split('"')
            result['title'] = s[1]
        elif 'url:' in line:
            data_field.remove('url:')
            s = line.split('"')
            result['url'] = s[1]

    data_field = list(DATA_FIELD)
    result = {}
    with open(file_dir, 'r', encoding="utf-8") as md:
        result['content'] = md.read()
        md.seek(0)
        md_line_data = md.readlines()
    for line in md_line_data:
        load_data()
        if not data_field:
            return result
    return result


def _gen_content_files():
    for root, dirs, files in walk(CONTENT_DIR):
        for f in files:
            if '.md' not in f:
                continue
            yield path.join(root, f)


def _search_dir(url):
    def _get_file_front_matter_url():
        with open(file_dir, 'r', encoding="utf-8") as md:
            md_line_data = md.readlines()
        for line in md_line_data:
            if 'url:' in line:
                return list(filter(None, re.split('"|\n', line)))[-1]

    for file_dir in _gen_content_files():
        if url == _get_file_front_matter_url():
            return path.dirname(file_dir)


def _search_content_dir(type_, categories=None):
    target = categories or type_

    def _get_file_front_matter_type():
        with open(file_dir, 'r', encoding="utf-8") as md:
            md_line_data = md.readlines()
        for line in md_line_data:
            if categories:
                if 'categories' in line:
                    return list(filter(None, re.split('"|\n|]', line)))[-1]
            else:
                if 'type:' in line:
                    return list(filter(None, re.split('"|\n', line)))[-1]

    for file_dir in _gen_content_files():
        if target == _get_file_front_matter_type():
            return path.dirname(file_dir)


class Content(Resource):
    DATA_FIELD = ['title:', 'url:']

    @property
    def url(self):
        return request.args.get('url', type=str)

    def _search_content(self):
        result = {}
        for file_dir in _gen_content_files():
            data = _get_data(file_dir)
            if self.url in data.get('url', ''):
                result = data
                result['path'] = file_dir
                yield result

    def _get_contents(self):
        for file_dir in _gen_content_files():
            yield _get_data(file_dir)

    def get(self):
        if self.url:
            return list(self._search_content())
        else:
            return list(self._get_contents())

    def post(self):
        try:
            file_dir = path.join(
                _search_dir(request.args.get('url', type=str)), 'index.md')
            md_content = request.json.get('content')
            with open(file_dir, 'w', encoding="utf-8") as md:
                md.write(md_content)
            return md_content
        except TypeError as err:
            logger.error(
                'Content post failed with file_dir param contain None. error: {}'.format(err))
        except OSError as err:
            logger.error(
                'Content post failed with: {} is not exist{}'.format(file_dir, err))
        except AttributeError as err:
            logger.error('Content post failed with AttributeError: {}'.format(err))
        except Exception as err:
            logger.error('Content post failed with: {}'.format(err))

    def delete(self):
        content_data = list(self._search_content())
        file_dir = content_data[0].get('path')
        if path.exists(file_dir):
            remove(file_dir)
            logger.info('delete file: {}'.format(file_dir))
        else:
            logger.warning('delete fail with {} not exist'.format(file_dir))


@contents_app.route('/api/upload/img', methods=['POST'])
def upload_img():
    img_data = request.files['image']
    file_dir = _search_dir(request.args.get('url', type=str))
    img_dir = path.join(file_dir, 'img/{}'.format(img_data.filename))
    img_data.save(img_dir)
    return {'filename': img_data.filename}


@contents_app.route('/api/delete/img', methods=['DELETE'])
def delete_img():
    try:
        file_dir = _search_dir(request.args.get('url', type=str))
        img_dir = path.join(file_dir, 'img/{}'.format(request.args.get('filename', type=str)))
        remove(img_dir)
        logger.info('delete img: {}'.format(img_dir))
        return {'filename': request.args.get('filename', type=str)}
    except TypeError as err:
        logger.error('delete img: {} failed with file_dir is None. error: {}'.format(
            request.args.get('filename', type=str), err))
        return {'filename': request.args.get('filename', type=str)}
    except OSError as err:
        logger.error('delete img: {} failed with img_dir is not exist. error: {}'.format(
            request.args.get('filename', type=str), err))
        return {'filename': request.args.get('filename', type=str)}
    except Exception as err:
        logger.error('delete img: {} failed with {}'.format(
            request.args.get('filename', type=str), err))
        return {'filename': request.args.get('filename', type=str)}


@contents_app.route('/api/upload/static/img', methods=['POST'])
def upload_static_img():
    img_data = request.files['image']
    img_dir = path.join(STATIC_DIR, 'img',
                        request.args.get('type', type=str),
                        request.args.get('filename', type=str))
    img_data.save(img_dir)
    return {'filename': request.args.get('filename', type=str)}


@contents_app.route('/api/new_content', methods=['POST'])
def gen_content():
    front_matter = request.json.get('frontMatter', '---\n---')
    name = request.json.get('name', 'Undefind')
    dir_ = path.join(_search_content_dir(
        request.json.get('type'), request.json.get('categories')), name)
    if dir_:
        mkdir(dir_)
        mkdir(path.join(dir_, 'img'))
        with open(path.join(dir_, 'index.md'), 'w') as md:
            md.write(front_matter)
    return {'new_content': name}


api.add_resource(Content, '/api/contents')