from flask_restful import Resource, reqparse
from flask import current_app
from flask_jwt_extended import jwt_required, get_jwt_identity
from werkzeug.datastructures import FileStorage
from werkzeug.utils import secure_filename
from common.utils.document_utils import (
    create_document_stack, process_url, start_embedding_task,
    validate_file_type, EveAIInvalidLanguageException, EveAIDoubleURLException, EveAIUnsupportedFileType,
    process_multiple_urls, prepare_youtube_document
)
from common.utils.eveai_exceptions import EveAIYoutubeError


class AddDocumentResource(Resource):
    @jwt_required()
    def post(self):
        parser = reqparse.RequestParser()
        parser.add_argument('file', type=FileStorage, location='files', required=True)
        parser.add_argument('name', type=str, required=False)
        parser.add_argument('language', type=str, required=True)
        parser.add_argument('user_context', type=str, required=False)
        parser.add_argument('valid_from', type=str, required=False)
        args = parser.parse_args()

        tenant_id = get_jwt_identity()
        current_app.logger.info(f'Adding document for tenant {tenant_id}')

        try:
            file = args['file']
            filename = secure_filename(file.filename)
            extension = filename.rsplit('.', 1)[1].lower()

            validate_file_type(extension)

            api_input = {
                'name': args['name'] or filename,
                'language': args['language'],
                'user_context': args['user_context'],
                'valid_from': args['valid_from']
            }

            new_doc, new_doc_vers = create_document_stack(api_input, file, filename, extension, tenant_id)
            task_id = start_embedding_task(tenant_id, new_doc_vers.id)

            return {
                'message': f'Processing on document {new_doc.name}, version {new_doc_vers.id} started. Task ID: {task_id}.',
                'document_id': new_doc.id,
                'document_version_id': new_doc_vers.id,
                'task_id': task_id
            }, 201

        except (EveAIInvalidLanguageException, EveAIUnsupportedFileType) as e:
            return {'message': str(e)}, 400
        except Exception as e:
            current_app.logger.error(f'Error adding document: {str(e)}')
            return {'message': 'Error adding document'}, 500


class AddURLResource(Resource):
    @jwt_required()
    def post(self):
        parser = reqparse.RequestParser()
        parser.add_argument('url', type=str, required=True)
        parser.add_argument('name', type=str, required=False)
        parser.add_argument('language', type=str, required=True)
        parser.add_argument('user_context', type=str, required=False)
        parser.add_argument('valid_from', type=str, required=False)
        args = parser.parse_args()

        tenant_id = get_jwt_identity()
        current_app.logger.info(f'Adding document from URL for tenant {tenant_id}')

        try:
            file_content, filename, extension = process_url(args['url'], tenant_id)

            api_input = {
                'url': args['url'],
                'name': args['name'] or filename,
                'language': args['language'],
                'user_context': args['user_context'],
                'valid_from': args['valid_from']
            }

            new_doc, new_doc_vers = create_document_stack(api_input, file_content, filename, extension, tenant_id)
            task_id = start_embedding_task(tenant_id, new_doc_vers.id)

            return {
                'message': f'Processing on document {new_doc.name}, version {new_doc_vers.id} started. Task ID: {task_id}.',
                'document_id': new_doc.id,
                'document_version_id': new_doc_vers.id,
                'task_id': task_id
            }, 201

        except EveAIDoubleURLException:
            return {'message': f'A document with URL {args["url"]} already exists.'}, 400
        except (EveAIInvalidLanguageException, EveAIUnsupportedFileType) as e:
            return {'message': str(e)}, 400
        except Exception as e:
            current_app.logger.error(f'Error adding document from URL: {str(e)}')
            return {'message': 'Error adding document from URL'}, 500


class AddMultipleURLsResource(Resource):
    @jwt_required()
    def post(self):
        parser = reqparse.RequestParser()
        parser.add_argument('urls', type=str, action='append', required=True)
        parser.add_argument('name', type=str, required=False)
        parser.add_argument('language', type=str, required=True)
        parser.add_argument('user_context', type=str, required=False)
        parser.add_argument('valid_from', type=str, required=False)
        args = parser.parse_args()

        tenant_id = get_jwt_identity()
        current_app.logger.info(f'Adding multiple documents from URLs for tenant {tenant_id}')

        try:
            api_input = {
                'name': args['name'],
                'language': args['language'],
                'user_context': args['user_context'],
                'valid_from': args['valid_from']
            }

            results = process_multiple_urls(args['urls'], tenant_id, api_input)

            return {
                'message': 'Processing of multiple URLs completed',
                'results': results
            }, 201

        except Exception as e:
            current_app.logger.error(f'Error adding documents from URLs: {str(e)}')
            return {'message': 'Error adding documents from URLs'}, 500


class AddYoutubeResource(Resource):
    @jwt_required()
    def post(self):
        parser = reqparse.RequestParser()
        parser.add_argument('url', type=str, required=True)
        parser.add_argument('name', type=str, required=False)
        parser.add_argument('language', type=str, required=True)
        parser.add_argument('user_context', type=str, required=False)
        parser.add_argument('valid_from', type=str, required=False)
        args = parser.parse_args()

        tenant_id = get_jwt_identity()
        current_app.logger.info(f'Adding YouTube document for tenant {tenant_id}')

        try:
            api_input = {
                'name': args['name'],
                'language': args['language'],
                'user_context': args['user_context'],
                'valid_from': args['valid_from']
            }

            new_doc, new_doc_vers = prepare_youtube_document(args['url'], tenant_id, api_input)
            task_id = start_embedding_task(tenant_id, new_doc_vers.id)

            return {
                'message': f'Processing on YouTube document {new_doc.name}, version {new_doc_vers.id} started. Task ID: {task_id}.',
                'document_id': new_doc.id,
                'document_version_id': new_doc_vers.id,
                'task_id': task_id
            }, 201

        except EveAIYoutubeError as e:
            return {'message': str(e)}, 400
        except (EveAIInvalidLanguageException, EveAIUnsupportedFileType) as e:
            return {'message': str(e)}, 400
        except Exception as e:
            current_app.logger.error(f'Error adding YouTube document: {str(e)}')
            return {'message': 'Error adding YouTube document'}, 500


# You can add more API resources here as needed