import os
from changedetectionio.strtobool import strtobool

from flask_expects_json import expects_json
from changedetectionio import queuedWatchMetaData
from changedetectionio import worker_handler
from flask_restful import abort, Resource
from flask import request, make_response, send_from_directory
import validators
from . import auth
import copy

# Import schemas from __init__.py
from . import schema, schema_create_watch, schema_update_watch, validate_openapi_request


class Watch(Resource):
    def __init__(self, **kwargs):
        # datastore is a black box dependency
        self.datastore = kwargs['datastore']
        self.update_q = kwargs['update_q']

    # Get information about a single watch, excluding the history list (can be large)
    # curl http://localhost:5000/api/v1/watch/<string:uuid>
    # @todo - version2 - ?muted and ?paused should be able to be called together, return the watch struct not "OK"
    # ?recheck=true
    @auth.check_token
    @validate_openapi_request('getWatch')
    def get(self, uuid):
        """Get information about a single watch, recheck, pause, or mute."""
        from copy import deepcopy
        watch = deepcopy(self.datastore.data['watching'].get(uuid))
        if not watch:
            abort(404, message='No watch exists with the UUID of {}'.format(uuid))

        if request.args.get('recheck'):
            worker_handler.queue_item_async_safe(self.update_q, queuedWatchMetaData.PrioritizedItem(priority=1, item={'uuid': uuid}))
            return "OK", 200
        if request.args.get('paused', '') == 'paused':
            self.datastore.data['watching'].get(uuid).pause()
            return "OK", 200
        elif request.args.get('paused', '') == 'unpaused':
            self.datastore.data['watching'].get(uuid).unpause()
            return "OK", 200
        if request.args.get('muted', '') == 'muted':
            self.datastore.data['watching'].get(uuid).mute()
            return "OK", 200
        elif request.args.get('muted', '') == 'unmuted':
            self.datastore.data['watching'].get(uuid).unmute()
            return "OK", 200

        # Return without history, get that via another API call
        # Properties are not returned as a JSON, so add the required props manually
        watch['history_n'] = watch.history_n
        # attr .last_changed will check for the last written text snapshot on change
        watch['last_changed'] = watch.last_changed
        watch['viewed'] = watch.viewed
        return watch

    @auth.check_token
    @validate_openapi_request('deleteWatch')
    def delete(self, uuid):
        """Delete a watch and related history."""
        if not self.datastore.data['watching'].get(uuid):
            abort(400, message='No watch exists with the UUID of {}'.format(uuid))

        self.datastore.delete(uuid)
        return 'OK', 204

    @auth.check_token
    @validate_openapi_request('updateWatch')
    @expects_json(schema_update_watch)
    def put(self, uuid):
        """Update watch information."""
        watch = self.datastore.data['watching'].get(uuid)
        if not watch:
            abort(404, message='No watch exists with the UUID of {}'.format(uuid))

        if request.json.get('proxy'):
            plist = self.datastore.proxy_list
            if not request.json.get('proxy') in plist:
                return "Invalid proxy choice, currently supported proxies are '{}'".format(', '.join(plist)), 400

        watch.update(request.json)

        return "OK", 200


class WatchHistory(Resource):
    def __init__(self, **kwargs):
        # datastore is a black box dependency
        self.datastore = kwargs['datastore']

    # Get a list of available history for a watch by UUID
    # curl http://localhost:5000/api/v1/watch/<string:uuid>/history
    @auth.check_token
    @validate_openapi_request('getWatchHistory')
    def get(self, uuid):
        """Get a list of all historical snapshots available for a watch."""
        watch = self.datastore.data['watching'].get(uuid)
        if not watch:
            abort(404, message='No watch exists with the UUID of {}'.format(uuid))
        return watch.history, 200


class WatchSingleHistory(Resource):
    def __init__(self, **kwargs):
        # datastore is a black box dependency
        self.datastore = kwargs['datastore']

    @auth.check_token
    @validate_openapi_request('getWatchSnapshot')
    def get(self, uuid, timestamp):
        """Get single snapshot from watch."""
        watch = self.datastore.data['watching'].get(uuid)
        if not watch:
            abort(404, message=f"No watch exists with the UUID of {uuid}")

        if not len(watch.history):
            abort(404, message=f"Watch found but no history exists for the UUID {uuid}")

        if timestamp == 'latest':
            timestamp = list(watch.history.keys())[-1]

        if request.args.get('html'):
            content = watch.get_fetched_html(timestamp)
            if content:
                response = make_response(content, 200)
                response.mimetype = "text/html"
            else:
                response = make_response("No content found", 404)
                response.mimetype = "text/plain"
        else:
            content = watch.get_history_snapshot(timestamp)
            response = make_response(content, 200)
            response.mimetype = "text/plain"

        return response

class WatchFavicon(Resource):
    def __init__(self, **kwargs):
        # datastore is a black box dependency
        self.datastore = kwargs['datastore']

    @auth.check_token
    @validate_openapi_request('getWatchFavicon')
    def get(self, uuid):
        """Get favicon for a watch."""
        watch = self.datastore.data['watching'].get(uuid)
        if not watch:
            abort(404, message=f"No watch exists with the UUID of {uuid}")

        favicon_filename = watch.get_favicon_filename()
        if favicon_filename:
            try:
                import magic
                mime = magic.from_file(
                    os.path.join(watch.watch_data_dir, favicon_filename),
                    mime=True
                )
            except ImportError:
                # Fallback, no python-magic
                import mimetypes
                mime, encoding = mimetypes.guess_type(favicon_filename)

            response = make_response(send_from_directory(watch.watch_data_dir, favicon_filename))
            response.headers['Content-type'] = mime
            response.headers['Cache-Control'] = 'max-age=300, must-revalidate'  # Cache for 5 minutes, then revalidate
            return response

        abort(404, message=f'No Favicon available for {uuid}')


class CreateWatch(Resource):
    def __init__(self, **kwargs):
        # datastore is a black box dependency
        self.datastore = kwargs['datastore']
        self.update_q = kwargs['update_q']

    @auth.check_token
    @validate_openapi_request('createWatch')
    @expects_json(schema_create_watch)
    def post(self):
        """Create a single watch."""

        json_data = request.get_json()
        url = json_data['url'].strip()

        # If hosts that only contain alphanumerics are allowed ("localhost" for example)
        allow_simplehost = not strtobool(os.getenv('BLOCK_SIMPLEHOSTS', 'False'))
        if not validators.url(url, simple_host=allow_simplehost):
            return "Invalid or unsupported URL", 400

        if json_data.get('proxy'):
            plist = self.datastore.proxy_list
            if not json_data.get('proxy') in plist:
                return "Invalid proxy choice, currently supported proxies are '{}'".format(', '.join(plist)), 400

        extras = copy.deepcopy(json_data)

        # Because we renamed 'tag' to 'tags' but don't want to change the API (can do this in v2 of the API)
        tags = None
        if extras.get('tag'):
            tags = extras.get('tag')
            del extras['tag']

        del extras['url']

        new_uuid = self.datastore.add_watch(url=url, extras=extras, tag=tags)
        if new_uuid:
            worker_handler.queue_item_async_safe(self.update_q, queuedWatchMetaData.PrioritizedItem(priority=1, item={'uuid': new_uuid}))
            return {'uuid': new_uuid}, 201
        else:
            return "Invalid or unsupported URL", 400

    @auth.check_token
    @validate_openapi_request('listWatches')
    def get(self):
        """List watches."""
        list = {}

        tag_limit = request.args.get('tag', '').lower()
        for uuid, watch in self.datastore.data['watching'].items():
            # Watch tags by name (replace the other calls?)
            tags = self.datastore.get_all_tags_for_watch(uuid=uuid)
            if tag_limit and not any(v.get('title').lower() == tag_limit for k, v in tags.items()):
                continue

            list[uuid] = {
                'last_changed': watch.last_changed,
                'last_checked': watch['last_checked'],
                'last_error': watch['last_error'],
                'title': watch['title'],
                'url': watch['url'],
                'viewed': watch.viewed
            }

        if request.args.get('recheck_all'):
            for uuid in self.datastore.data['watching'].keys():
                worker_handler.queue_item_async_safe(self.update_q, queuedWatchMetaData.PrioritizedItem(priority=1, item={'uuid': uuid}))
            return {'status': "OK"}, 200

        return list, 200